Saturday, November 18, 2017

Small Scale Anaerobic Digestion - A Definition Plus Pocket-Biogas and On...


Small-scale or "pocket" digestion is a technology where the anaerobic digestion process is applied to proprietary biomass flows for the on-site production of renewable energy. This energy is made available in the form of electricity and heat after combustion of the biogas in a combined heat and power (CHP) installation and is used to a maximum on-site.

Although there is no internationally accepted legal definition for pocket digestion, there is a consensus that the term “pocket digestion” is applicable to installations with a proprietary biomass supply that produce energy in function of the proprietary energy demand. “Mono-digestion” is applicable for installations that use only one type of biomass input. The smallest installations are also called micro digesters.

(c) Gent University

The popularity of pocket digestion has increased greatly in the last few years in the Flemish region of Belgium and a number of neighbouring countries.

In Flanders there are about 80 active pocket installations to this date and it is expected that this number will increase significantly over the next years.

This video is based upon the definition provided by the University of Gent, Faculty of Bioscience Engineering in their pdf document, titled "Small-Scale Anaerobic Digestion Case studies in Western Europe".

For more information on this informative download visit:  or click the link below.

This video is available for wtaching and embedding at the YouTube website location here.

IADAB News Weekly - Edition 9: Biomethane Injection in Europe Growth and UK's Green Gas Certification Scheme

Date: 17 November 2017: This is Issue 9 of IADAB News Weekly where we summarise the most important news of the week in the fast developing Anaerobic Digestion and Biogas Industry, both in the UK and globally.

This is a special biomethane edition. Biomethane production from biogas is important. Biomethane is made by purification of the raw biogas, gives it virtually the same market for it's creators to sell it in, as natural gas. Doing this means that instead of about 30% of the energy being lost in the electricity grid by the time it gets to the user, all of it can be used to fuel say a transport vehicle. This seen as a very sustainable way to improve the effectiveness of anaerobic digestion derived energy.

Alright, let’s get started…

The following is our intro video. Watch the intro video below, for a taster of what you will read if you scroll down below the video:

The first is an extract from part of a fact-filled overview of biomethane injection in Europe from a French perspective, which explains how France’s Energy Transition for Green Growth Law (LTECV) is expected to boost the development of their biomethane injection industry.

Second of our article extracts provides more evidence of the extent, globally that the biomethane market is expected to experience a hike in growth by 2025. This will hardly be news to our readers, after reading about the French LTECV, but it serves to reinforce the view that big opportunities are ahead for growth in biomethane production. Most notably this will be in a big increase in the injection of biomethane into local gas grids, and the use of biomethane to replace diesel in fleets of vehicles.

But, this growth will only be reliably be supported by the public, as long as the claimed "green" benefits of biogas match reality, and the industry will need to show transparency about their output volumes, and demonstrate that their AD plants stand up to independent auditing of their "green" gas production rates.

That's why we include our third news snippet, which features UK Biomethane Certification for UK AD Plants. In fact, it is happening already. The UK Biomethane Certification of UK AD Plants (GGCS ), now tops the impressive "1 TerraWatt hour" mark. The GGCS is said to be a reliable means of ensuring that there is no double-counting or double-selling of green gas.

Finally, we have included a snippet from a case study, in the form of the plans of a Swiss company, "Salt" (a Telecoms Provider) to become "a green and sustainable business", with its new car fleet which will be powered by CNG / Biomethane. This extract shows that businesses are taking up the opportunity to use biomethane, and investing the necessary money now to buy CNG fuelled vehicles.

Now scroll on down and read the article excerpts described above:

1. The French Renewable Gas Outlook 2016/17 – Overview of Biomethane Injection in Europe

Renewable Natural Gas: A Solution For Reducing Greenhouse Gas Emissions In The Future

Biogas production is part of the renewable energy development strategy in France since 2011. The France’s Energy Transition for Green Growth Law (LTECV) boosts the development of the biomethane injection industry.

In 2016, 40 400 tonnes of greenhouse gases were avoided thanks to biomethane. According to an analysis by GRDF and ADEME, the development of the biomethane sector would avoid 750 000 tonnes of CO2 by 2020.

An Important Potential For Biomethane

In France, the biomethane sector is currently booming. In 2016, 215 GWh were injected into the gas network – an annual increase of 162%.

France has 548 biogas production units, 26 of which inject biomethane into the natural gas network. However, renewable natural gas represents only 0,05% of the French consumption, while the Energy Transition for Green Growth Law sets at 10% the consumption of renewable natural gas by 2030.

A Growth Target Of 8 Twh Of Biomethane Injected In 2023

The developmental objectives for biomethane injection fixed by the Energy Transition Law are 1.7 TWh in 2018 and 8 TWh in 2023. Overview of biomethane- BiogasWorld

2. Biomethane Market Estimated to Experience a Hike in Growth by 2025

The frontrunners in the global biomethane gas market, according to one of the reports by Transparency Market Research, are CNG Services Ltd., Planet Biogas Global GmbH, SGN, Future Biogas Ltd., VERBIO, Magne Gas, Gasrec, Gazasia Ltd., Biogas Products Ltd., Schmack Carbotech GmbH, EnviTec Biogas AG, SoCalGas, ETW Energietechnik GmbH, ORBITAL, and JV Energen.

As per estimates of a report by Transparency Market Research, the global biomethane market stood at a valuation of US$1,485.4 mn in 2016 and is expected to reach a valuation of US$2,624.5 mn by 2025 rising at a CAGR of 6.7% between 2017 and 2025.

The segments of the global biomethane market based upon application are automotive sector and power generation. The automotive sector is expected to account for a significant share in the market over the forecast period.

The key regional segments into which the global market for biomethane is divided in this report are North America, Europe, Latin America, Asia Pacific, and the Middle East and Africa. In 2016, North America and Europe held a significant share of the global biomethane market. The trend is expected to continue over the forecast period as well.

Feasibility of Biomethane as an Automobile Fuel Fuels Growth

One of the key growth drivers of the global biomethane market is the green gas characteristic of biomethane. 

Biomethane is produced by the natural breakdown of organic material, which includes green waste, agricultural waste, food industry waste, household waste, and even industrial waste.

The process of production of biomethane involves breaking down of organic matter in an anaerobic environment to produce biogas, which is further purified to produce biomethane. 

The resultant gas can be used as a vehicle fuel or can be injected into the main gas network to generate green energy. via Biomethane Market Estimated to Experience a Hike in Growth by 2025

3. UK Biomethane Certification Tops 1TWh Marker

UK: With more than 40 biomethane plants now part of GGCS the following information on this article is available via Biomethane certification tops 1TWh marker :

An Introduction to the Green Gas Certification Scheme

The GGCS provides an objective means of tracking the commercial transactions of biomethane ( or ‘green gas’) through the supply chain. It tracks the green gas from its injection into the gas distribution network and its sale to a supplier or trader, through to when it is sold on to an end-use consumer. 
It is important to note that the GGCS tracks the contractual flows of green gas rather than the physical flows of green gas. Since each unit of green gas injected into the network displaces the need for a unit of conventional, or natural gas, the contracts are the only practical means of tracking the green gas from production to end use.
In this way, the GGCS is a reliable means of ensuring that there is no double-counting or double-selling of green gas. It eliminates from the green gas market the sorts of misleading claims that have characterised the ‘green’ electricity market for the past ten years. 
The GGCS thereby promotes confidence in the wider energy sector and encourages green gas producers to inject their gas into the gas distribution network as an alternative to using it generate electricity.

4. Switzerland: Salt (Telecoms Provider) Becomes Green, New Car Fleet Powered By CNG / Biomethane

Over the next 6 months, Salt will renew a large part of its corporate fleet by choosing a Seat car, the Leon 1.4 TGI EcoFuel, powered by petrol and natural gas / biomethane. The first Swiss telecom operator to do so, Salt placed an order with its fleet management partner in October.

The combination of two separate fuel tanks makes it easy to switch between one type of fuel and the other, the range of the natural gas / biomethane tank is 400 km and that of petrol is 900 km.

IADAB News Weekly - Edition 9 - Seat CNG Fuel Car in "Salt" company colours

Image: A photo of the Leon 1.4 TGI EcoFuel car, powered by petrol and natural gas / biomethane. 

From now on, it will make up the majority of vehicles in Salt's new car fleet.

Salt's goal is to use natural gas / biomethane on at least 80% of the kilometers traveled. This will allow Salt to reduce its CO2 emissions by up to 40% compared to an equivalent fleet of vehicles fueled exclusively by petrol. 

Natural gas / biomethane is available in more than 140 service stations throughout Switzerland. 

In general, it is a mix of 80% natural gas and 20% biomethane produced from Swiss organic waste.
via Switzerland: Salt Becomes Green, New Car Fleet Powered By Cng / Biomethane

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Friday, November 10, 2017

IADAB News Weekly - Edition 8: Biogas Plants in Germany a Home Biogas Product and UK's Severn-Trent Invests in Upgrades

Date: 10 November 2017: This is Issue 8 of IADAB News Weekly where we summarise the most important news of the week in the fast developing Anaerobic Digestion and Biogas Industry, both in the UK and globally.

In this edition of the most trending anaerobic digestion and biogas news, we bring you an update on the number Biogas Plants in Germany and total energy output, we include an article about a Home Biogas Product, and explain why UK's Severn Trent is investing in biogas plant upgrades.

Alright, let’s get started…

The following is our intro video. Watch the intro video below, for a taster of what you will read if you scroll down below the video:

The Biogas industry in Germany is saving 20 million tonnes of CO2 emissions annually, and  205 new biogas plants were connected to the grid in 2016, more than the 150 expected by the association. The combination of new plants and expansions to existing plants mean Germany’s biogas industry is now generating an additional 219MW a year. Nevertheless, as a nation Germany needs to do better because the government is currently not achieving its 2020 self-imposed climate goals.

We include news of the HomeBiogas 2.0 product from an Isreali start-up business which has been successful already in developing the first version of this product, using crowd-funding. Now they are seeking funding for the start of production of their second product which they say will produce better biogas production results, at very much reduced cost. The new anaerobic digestion system is claimed to produce 3 hours of cooking gas per day from Kitchen Scraps, thus passing an important milestone for self-sufficiency in family cooking fuel requirements.

We do not know enough about this product to recommend it or not. We welcome comments from any readers who have bought and used the initial Mark 1 - HomeBiogas digester system.

Finally, the news that Severn Trent is investing £60m in biogas upgrade equipment which raises the biogas output (yield) from their existing anaerobic digestion plants by about one third from the same sludge feedstock, is welcome news. If it makes financial sense, and we have no doubt ST has done their calculations correctly on that, we can expect many more water utility companies to follow by adding hydrolysis units to their biogas plants.

Now scroll-on down for the article excerpts:

Biogas industry in Germany saving 20 million tonnes of CO2 emissions

Biogas plants in Germany are saving 20 million tonnes of CO2 emissions a year, according to the president of the German Biogas Association.

Recently released figures from the German Biogas Association show that 205 new biogas plants were connected to the grid in 2016, more than the 150 expected by the association. The figures also show that 10 biogas plants were decommissioned.

In total, the new plants have an output of 45 megawatts (MW), with 37 MW being used to generate electricity.
"All in all, the growth in the new plants is still very low compared to previous years, but many operators are investing more in the flexibility of their plants. This investment and the export business allow the plant builders to survive," 
explained Horst Seide, president of the German Biogas Association.

Increased investment in small liquid manure plants will likely continue the increase in plant numbers, according to the association.

The biogas figures come in the wake of Germany’s Federal Environment Ministry showing that the government missed its 2020 self-imposed climate goals.

Figures from the German Biogas Association reveal that in total plants installed 175MW in additional capacity in 2016.

The combination of new plants and expansions to existing plants mean Germany’s biogas industry is now generating an additional 219MW a year. via Biogas industry in Germany

HomeBiogas 2.0 Produces 3 Hours Of Cooking Gas Per Day From Kitchen Scraps

One Israeli company has developed the next generation of what it believes to be a simple and effective device for turning kitchen scraps into fuel and fertilizer, thereby tackling both food waste and clean cooking in one fell swoop.

HomeBiogas, which successfully launched its first home biodigester system on Indiegogo in early 2016, has been working to improve the design of its product into a more durable, lower cost, and more efficient model, and recently unveiled the next iteration of this backyard biogas device. While its first product offering was priced right around $1000, the new version, HomeBiogas 2.0, is selling for less than half of that, and is claimed to work at twice its original speed.

The biogas appliance is meant to sit in the yard near the kitchen (up to 20 meters away), where the 1200-litre tank is filled with water, “activated” with bacteria, and then filled with food scraps, kitchen and garden waste, or animal manure on a daily basis. Inside the digester tank, bacteria breaks down the organic matter, producing biogas that gets collected in a 700-litre gas storage tank, which then feeds the biogas to the stove in the kitchen.

It is a completely off-grid appliance, and as long as it is fed properly and within the optimal temperature range, it is claimed to produce up to 3 hours worth of cooking gas daily. When outside temperatures are above or below the recommended range, the appliance requires shade, insulation, or a heater to perform as designed.

In addition to biogas for cooking, the HomeBiogas 2.0 system also produces up to 12 litres of organic liquid fertiliser each day, which can go a long way toward boosting garden yields and increasing soil health and fertility.

According to the press materials, although the HomeBiogas 2.0 system gradually fills its gas storage tank as the biogas is produced, a “patented mechanical pressure mechanism” and an inline gas purifier ensure that clean, ready-to-use cooking gas is delivered at a uniform rate to the biogas stove.

Backers of the Kickstarter campaign at the $475 level will receive a HomeBiogas 2.0 appliance and a specially adapted biogas stove burner when they ship in the spring of 2018. And for those who want to buy in at an even lower rate in order to resell the units, a pallet of 10 units is available to pledges at the $3,600 level.

While this home biogas appliance looks to be an effective way for homeowners (and renters) to convert organic waste into a clean and off-grid cooking fuel, it’s the possibilities for it to alleviate deforestation, dirty cooking fires, and air pollution in the developing world that could have a large impact.

And because of that, HomeBiogas is also matching donations to the campaign that will go to fund local organisations in Puerto Rico and Kenya in order to provide clean energy to the families there who really need it.  via Producing Cooking from Kitchen Scraps

Severn Trent invests £60m in biogas upgrade

Severn Trent has invested £60 million in a thermal hydrolysis plant (THP) to make the process of generating clean energy at one of its sites more efficient.

The water company says the technology will see the electricity produced at Minworth Sewage Treatment Works increase by almost a third.

The process works by treating sewage sludge, using heat and pressure to sterilise and shatter the cell structure of the bacteria within.

The treated sludge then undergoes a biodegrading process to turn its solid matter into methane-rich biogas.

ST's Minworth Treatment Works, with Hydrolysis Equipment in the foreground (Copyright ST) 

The remainder can then be recycled and used as a fertiliser for agricultural land.
By generating renewable energy in this way, Severn Trent says it has been able to reduce costs, helping it keep customer bills down.

It expects the THP installation to be fully operational by 2018.

David Nyul, Project Manager for Severn Trent, said: “Generating clean energy through anaerobic digestion is a real priority for us and we’ve been treating sewage in this way for the last 60 years.

“Across the company we currently generate around 34% of all of the energy we use as a business and the thermal hydrolysis process will move us closer to our target of making that 50% by 2020.” via Severn Trent invests £60m in biogas upgrade


So, the message to the AD and Biogas industry this week is to continue to plan for expansion, ahead of many new opportunities likely to flow from the news of this last week...

Is it too soon to say that on the home biogas plant front, there will soon be a solution which becomes the new standard in low-cost home biogas units? If so, there could be MASSIVE global sales. Comments are welcome! 

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Tuesday, November 07, 2017

Global Benefits of Biogas Technology - World Biogas Association's 1st Year

Image of WBA President talking about the Global Benefits of Biogas Technology
 WBA President David Newman
The new UK based voice which promotes the global benefits of Biogas Technology, The World Biogas Association (WBA), is celebrating its first birthday at the COP23 climate change conference later this week.

The press release below explains the very active first year of this new organisation. It's efforts are very much to be applauded, and if possible are even more important than when the organisation was formed a year ago.

In our humble opinion writing for this blog, the raised importance of the work of the WBA is due to at least two factors:
  • the faltering support for the 2015 Paris Accord climate change from the Trump administration, plus
  • the recent news of alarming rises in carbon dioxide levels in the global atmosphere recently.
We hope that you will scroll on down this age and read more, because it has never been more urgent to explain to the world the potential benefits of anaerobic digestion and biogas technology.

Global biogas association celebrates first year of achievements

PRESS RELEASE -  6 November 2017:

WBA President David Newman will be speaking at the global climate-change summit in Bonn on Thursday:

The World Biogas Association (WBA) is today celebrating its first year of achievements at the UN COP23 Climate Change Conference in Bonn as global leaders come together to review progress on reducing greenhouse gas emissions.

Watch the video below for an on-screen presentation of the work of the first year of the world Biogas Association:

The WBA was founded a year ago at COP22 in Marrakech with the aim of demonstrating the huge contribution that biogas can make to reducing emissions and supporting policymakers to create an environment that will encourage the development of biogas globally. Biogas, produced through reprocessing organic wastes and purpose-grown energy crops in anaerobic digestion plants, can be used to produce renewable heat and power, clean transport fuel, and nutrient-rich biofertiliser, and has the potential to reduce global greenhouse gas emissions by up to 20%.

In its first year, the WBA has published: a report on the contribution of biogas to meeting the UN Sustainable Development Goals (SDGs); three factsheets on how biogas can improve urban air quality, mitigate climate change, and help meet the UN SDGs; and five reports on biogas markets in the US, Netherlands, Italy, Australia, and Poland respectively. The WBA is now working closely with the C40 Cities Climate Leadership Group on a report into increasing the uptake of separate food waste collections around the world and helping cities understand how biogas technologies can help them resolve issues around food waste.

WBA President David Newman is speaking at an event at COP23 this Thursday (9th November) titled ‘Solving the nexus between waste, energy and agriculture – biogas technologies as a global solution’, which will examine how biogas can help to meet international climate goals and the UN SDGs.

Celebrating WBA’s achievements from its first year, Mr Newman said:

“It’s incredible to think that a whole year has already passed since we established the WBA at COP22 in Marrakech to be the voice for biogas around the world. We already have over 50 members from five different continents, and we’re growing all the time as those working in biogas across the planet look to the WBA to represent them at the highest political levels.
“I’m delighted to be speaking here at COP23 to share the many benefits of biogas with politicians, policymakers, industry, and academics from all over the world. This crucial summit is the perfect precursor to our report with C40 on how cities can use biogas to resolve issues around food waste collection and treatment.
“Biogas has enormous potential to provide solutions for waste management, renewable energy, sustainable farming, and food security in every country of the world, and the WBA is looking forward to celebrating even more achievements in our second year as we spread this message to policymakers and politicians far and wide.”

Photo of WBA President David Newman attached for use.

WBA website:

Or, for WBA publications click here.

For further information about the World Biogas Association Contact

Chris Noyce, PR & Parliamentary Affairs Executive, World Biogas Association

Tel: 020 3176 5441


Friday, November 03, 2017

IADAB News Weekly - Edition 7: New UK GreenForty AD Plant in Planning, Spent Mushrooms as Feedstock and an Apology

Date: 3 November 2017

This is Issue 7 of IADAB News Weekly where we summarise the most important news of the week in the fast developing Anaerobic Digestion and Biogas Industry, both in the UK and globally.

This week we report on a new UK GreenForty AD Plant which is now in Planning in Scotland, look briefly at some research which has given the green-light to using spent mushroom substrate as a biogas plant feedstock, and we also include the full details of an apology.

The apology was issued by the UK's Anaerobic Digestion and Bioresources Association. ADBA appear to have been concerned that the Press Release which they published and we carried last week, was unintentionally capable of being read as criticism of individuals on a certain committee.

Apparently, ABDA wish to make it clear that in-fact decision to delay was made by the whole government. The whole UK government, they say, was responsible for the decision to again delay the reinstatement of the Renewable Heat Incentive (RHI) for biogas plants.

Alright, let’s get started…

The following is our intro video. Watch the intro video below, for a taster of what you will read if you scroll down below the video:

That new announcement about new AD Plants seem to be rare nowadays, probably does say something about depressed state of new biogas plants in the UK.
The industry waits, and waits, for any government action on renewal of the subsidies that they say they are implementing and unsurprisingly few project developers are starting new AD projects. The exception this week is a project in the East Lothian Region of Scotland, as follows:

1. Planning Application for the erection of an anaerobic digestion (AD) plant

The application includes ancillary equipment, on-site infrastructure and associated works at Bangley Quarry Huntington Haddington East Lothian EH41 3SN via (AD) plants
Anaerobic digester plans have been submitted by GreenForty Development Limited. The company has submitted plans a facility which would use a variety of feedstocks – such as grass silage, hybrid rye, straw and vegetable processing residues – to produce renewable gas.
“Brewery and distillery by-products will be procured and delivered as available."
Once the biogas is produced, it would be ‘captured’; with most of it sent to a clean-up plant where it would be purified and upgraded before being put into the gas network.
The residual feedstock material would then be spread on farmland as a bio-fertiliser. via Anaerobic digester plans

The next item is from academia which reports on research into the anaerobic digestion of an, as far as we are aware, novel biomass source.

2. Anaerobic digestion of spent mushroom substrate under thermophilic conditions: performance and microbial community analysis

Spent mushroom substrate (SMS) is the residue of edible mushroom production occurring in huge amounts.
The SMS residue can be digested for biogas production in the mesophilic anaerobic digestion. In the present study, performance of batch thermophilic anaerobic digestion (TAD) of SMS was investigated as well as the interconnected microbial population structure changes. 
This study shows that TAD is a feasible method to handle the waste SMS. via Digestion of spent mushroom substrate

3. Anaerobic Digestion and Biogas Association Press Release Complains About Yet More UK Government Delays in Subsidy Restitution and then Apologises

In issue 6 of IADAB News Weekly we carried this Press Release. We are now compelled to re-publish it, in order to include the subsequent apology.

The Press Release and the Apology follows:

PRESS RELEASE: Renewable heat legislation delay threatens climate goals

Legislation on Renewable Heat Incentive delayed yet again due to Parliamentary backlog

25 October 2017 -
  • Government struggling to meet targets to decarbonise heat
  • Further delay threatens building of AD plants that produce renewable heat

The Chief Executive of the Anaerobic Digestion & Bioresources Association (ADBA) has described the government’s decision to further delay the tabling of legislation to support renewable heat generation as ‘a significant threat to the UK’s ability to meet its climate goals’.

The Department for Business, Energy & Industrial Strategy (BEIS) confirmed at the end of last week that the tabling of legislation to reform the Renewable Heat Incentive (RHI), the government’s principal mechanism for incentivising the generation of renewable heat, will now not take place until the beginning of 2018.

The legislation was originally due to be voted on in the spring of 2017 but was delayed after the government called a snap general election. It was then due to be introduced in the autumn, but has been delayed yet further due to the delay in re-establishing the Joint Committee on Statutory Instruments, a backlog in the legislative timetable following June’s general election, and a vast requirement for legislation related to Brexit.

The proposed RHI legislation would restore tariffs for the production of renewable heat to previously higher levels, facilitating the construction of anaerobic digestion (AD) plants that can produce renewable biogas, which can be upgraded to biomethane for injection into the gas grid. Millions of pounds of investment in AD plants is currently on hold, waiting for clarity and certainty from government.

AD treatment specialists Clearfleau Ltd have written directly to BEIS Secretary Greg Clark urging action on the legislation, stating that the setback is 

“delaying injection of significant volume of biogas generated from industrial residues into the gas grid, limiting the ability to curb UK carbon emissions.”

ADBA also understands that BEIS is considering imposing restrictions on the amount of investment in renewable heat that can receive a guaranteed tariff rate. Some AD developers that have invested around £100,000 in reaching the stage where they can apply for a guarantee in reliance on the promised higher tariff rates may therefore face the prospect of missing out on government support entirely.

ADBA Chief Executive Charlotte Morton said:

"This further delay to the passing of the RHI legislation is another unnecessary blow to a vital industry that can make a large contribution to meeting the UK’s targets for decarbonising heat, to which the government has to date made very little progress. This delay not only puts millions of pounds of investment at risk but on a wider level is a significant threat to the UK’s ability to meet its climate change goals.
I’ve written directly to ministers at BEIS urging them to rethink their decision to delay the legislation further and to reiterate the damaging effect that this further delay will have on the AD industry and its ability to help decarbonise the UK’s gas grid.
We’re also very concerned at the suggestion from BEIS of new restrictions on the number of AD plants that can receive tariff guarantees. BEIS needs to ensure that it doesn’t punish AD for offering a clean and cost-effective way to heat our homes and businesses."

The ADBA Apology:

[​Please note that ADBA’s press release dated 25/10/17 (‘Renewable heat legislation delay threatens climate goals – ADBA’) contained an unintentionally misleading statement. 

We would like to make the following correction:

Charlotte Morton’s quote ‘I’ve written directly to ministers at BEIS urging them to rethink their decision to delay the legislation further’ is misleading as the decision to delay the RHI legislation would not have been one taken by BEIS ministers.

To clarify, ADBA believes that the decision to delay the RHI legislation lays not with BEIS ministers but rather with the government as a whole, as the government is able to prioritise which pieces of legislation are tabled when. 

We apologise for making an inaccurate implication, and accept that we should have been more careful and accurate in the language used.] via ABDA PR Room

Thursday, November 02, 2017

What is a Biogas Plant? for Home Community and Industry

Biogas is especially exciting because no matter how much biogas we use, we can always grow more, and make more of it, forever.

That's why biogas is amazing, and now we will explain what happens inside a biogas plant.

1 - Organic material arrives at the biogas plant.

The organic material delivered may include animal manure, food waste, agricultural residues, or wastewater solids (sludge).

The organic materials are the "input", or "feed" for the biogas plant.

Each individual biogas plant is tailor made for the feed materials which it will accept.

The accepted materials may be from just one source, or a combination of several types of organic food source.

2 - Organic material is broken down in a "digester"

Digesters can be wet (where the biomass is mixed in water and pumped and mixed as a slurry), or "dry" (where biomass is made wet with added water) but is handled as a solid.

The digester is a big tank, or multiple tanks, for fully mixed wet digestion.

Or, the digester may be a long tube, for plug-flow anaerobic digestion which is also a "wet" A.D. process.

And, sometimes (for a dry digester which operates on biomass solids), the digester reactor vessel is configured like a tunnel.

A tunnel type dry digester may be rounded, with large paddles to move the feedstock through the digester.

Or, a dry digester may have a flat floor for batch-by-batch production, and be wide and tall enough for feedstock loading and unloading vehicles to work in.

The digester is always airtight, and is usually equipped with mixing and heating equipment.

Naturally occurring microorganisms grow in the zero-oxygen environment.

They use the organic matter as their food, and break down (digest) the organic matter.

At wet process A.D. plants the digester is continuously fed with organic materials (the feedstock) and biogas, and the remaining liquid and solids, are also simultaneously discharged.

At dry process A.D. plants some are continuously fed and flow constantly, and some are batch flow type plants with doors that are closed after each filling and are left for a period of time to digest, before being emptied completely.

3 - Raw biogas is produced, and flows out of the digester.

The biogas is mostly methane, but, it also contains carbon dioxide, water vapour, and raw biogas contains small amounts of what are known as, "trace" compounds which are potential pollutants.

Like biogas, "Natural gas" which is made from fossil fuels is also methane, the difference is that natural gas contains none of the impurities we just mentioned, two slides ago.

The most damaging impurities, if not removed from the biogas, are usually hydrogen sulphide, and siloxanes (chemicals which can build-up and obstruct the insides of generators, causing costly wear on components).

Purified biogas can replace "natural gas", but first it must be processed to as far as possible, remove everything but the methane.

The degree of processing which takes place in the anaerobic digestion plant, varies according to the use intended for the upgraded biogas.

Upgraded biogas of the highest quality is called "biomethane" or "renewable natural gas" R.N.G.

4 - After digestion in the Anaerobic Digestion Plant (Biogas Facility), which can take anything from 5 days to 60 days, the biogas is used in one of many ways.

Biogas may be used to: Produce heat, electricity, vehicle fuel.

Or, it may be used for injection in the gas grid (natural gas pipelines), after it has been upgraded to become very valuable "biomethane".

However, the biogas accounts for only a small proportion of the incoming material, and what is left, after digestion is called digestate.

5 - Co-products Made from Digestate in AD Plants

The digester residue which is known as "digestate" contains both solid fibres, and a liquid.

The solid portion and the liquid portion can be used to provide marketable products, such as liquid (or crystallised) fertiliser, compost, soil amendments, or animal bedding and fibre products for the building trade.

These are called "co-products", and like the biogas or biomethane, can be also sold for a profit.

We hope that you now have a clear understanding of what a biogas plant is.

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