Saturday, June 30, 2018

AD Plant/ Biogas Efficiency Improvements to feature this month at global biogas expo in UK

Increasing Anaerobic Digestion plant efficiency will be a subject featured at the forthcoming ADBA global biogas expo Birmingham UK.

Biogas Efficiency Improvements


Exhibitors will not be short on cost-effective methods, on offer capable of improving biogas yields, as the following ADBA Press Release makes clear:

Water industry anaerobic digestion (AD) plants can improve efficiency from 10% to 30%, according to key exhibitors at the eagerly awaited UK AD & World Biogas Expo 2018 taking place on July 11th-12th at Birmingham’s NEC.

Charlotte Morton, Chief Executive of the Anaerobic Digestion & Bioresources Association, who are organising the expo in partnership with the World Biogas Association, said: “Based on what we’ve seen with farm-based and food-waste AD plants, even when a digester appears to be steadily ticking along, some fine-tuning or retrofit of the mixing system can produce much better gas yields.

“In addition to more gas, technologically advanced mixing systems that will be on display at the expo can drastically reduce maintenance and energy costs.

“Improved monitoring can also bring about a positive difference to a digester – and with the possibility of mixing sewage sludge with food waste in the future, UK AD & World Biogas Expo 2018 is the perfect place to learn more about enhancing digester performance”.

Paul Davies from mixer and pump manufacturer Landia agreed:

“Based on the increasing number of retrofits we carry out in the AD sector, there is clearly a demand to reach optimum levels of AD operation – especially as a mixer retrofit doesn’t have to mean draining down the tank."
“Numerous farm and food waste AD operators are already seeing the benefit of fine-tuning their equipment, so there is a real opportunity for the water industry to review its renewables/biosolids operation – which can pay back in a short time-frame. We are ever-presents at the expo, which is totally focused on biogas. It is the best place to catch up on all the latest industry news, seek out advice and talk directly to equipment suppliers”.

Davies also states that while many mixing systems may have 7.5 kW motors, in most cases these are running flat out, using 180 kW hours per day.


For what he describes as ‘complete mixing of the whole digester’, Davies suggests AD operators consider 18.5 kW motors that only have to run for 10-15 minutes per hour, using just 110 kW hours per day.

Featuring more than 200 exhibitors from all over the world and 100-plus speakers, over 3,000 attendees are expected at UK AD & World Biogas Expo 2018, now in its ninth year.

What Others are Saying About Biogas Efficiency Improvements:

Evaluation of energy efficiency of various biogas production and utilisation pathways

The energy efficiency of different biogas systems, including single and co-digestion of multiple feedstock, different biogas utilization pathways, and waste-stream management strategies was evaluated. The input data were derived from assessment of existing biogas systems, present knowledge on anaerobic digestion process management and technologies for biogas system operating conditions in Germany. The energy balance was evaluated as Primary Energy Input to Output (PEIO) ratio, to assess the process energy efficiency, hence, the potential sustainability. Results indicate that the PEIO correspond to 10.5–64.0% and 34.1–55.0% for single feedstock digestion and feedstock co-digestion, respectively. Energy balance was assessed to be negative for feedstock transportation distances in excess of 22 km and 425 km for cattle manure and for Municipal Solid Waste, respectively, which defines the operational limits for respective feedstock transportation. Energy input was highly influenced by the characteristics of feedstock used. For example, agricultural waste, in most part, did not require pre-treatment. Energy crop feedstock required the respect cultivation energy inputs, and processing of industrial waste streams included energy-demanding pre-treatment processes to meet stipulated hygiene standards. Energy balance depended on biogas yield, the utilization efficiency, and energy value of intended fossil fuel substitution.
via Evaluation of biogases

HP efficiency for biogas

Combined heat and power plant efficiency is a function of the conversion efficiency of the energy in the fuel gas to useful energy in the form of electricity and heat.
A combined heat and power (CHP) plant is typically a reciprocating gas engine that uses the energy in the gas to drive a crank shaft. The crank shaft turns an alternator to produce electricity. Heat is released during the gas combustion process. This heat can be recovered during cogeneration in order to maximise the heating value of the system. via  Clarke Energy

Anaerobic digestion


Anaerobic digestion is the man-made process of harnessing the anaerobic fermentation of wastes and other biodegradable materials. Anaerobic microbes can be harnessed to treat problematic wastes, produce a fertiliser that can be used to replace high carbon emission chemical fertilisers. It also is the process that results in the production of biogas, which can be used to provide renewable power using biogas cogeneration systems. via  CHP 

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