Members’ News & Views


High levels of ammonia make poultry manure traditionally difficult to digest in an AD plant


HARPER ADAMS STUDY SUGGESTS AD COULD BE SOLUTION FOR FALLEN STOCK DISPOSAL


FINNISH PLANT FIRST TO USE NEW NITROGEN RECOVERY TECHNOLOGY


An AD plant in Finland has become the first to employ a novel nitrogen and phosphorus recovery technology. An 80m3


used at the demonstration plant in Tuorla, which has the capacity to treat 1,400 tpa of poultry manure, producing 266,000m3


fermenter from Ductor is being of biogas. Ductor’s proprietary


nitrogen-control technology harnesses the power of underused biowaste, such as poultry manure, which is notoriously difficult to treat in an AD plant due to high levels of nitrogen. The technology developed and patented by Ductor eliminates the nitrogen dilemma by turning so-called ‘problem waste’ into profitable, recyclable material. The technology removes 60 per cent of nitrogen by adding one fermentation step, prior to biogas fermentation, and a nitrogen stripping unit. www.ductor.com


EDINA WINS CONTRACT TO UPGRADE SOUTHERN WATER CHP PLANT


Edina Group has won the contract to replace the existing CHP plant at Southern Water’s Goddards Green wastewater treatment plant with a new, high-efficiency MWM-manufactured TCG 2016 V16 800kWe CHP engine. Southern Water is upgrading a number of its CHP plants, including: Gravesend, Kent; Goddards Green, Sussex; Millbrook, Hampshire; Fullerton, in Andover, Hampshire; and Budds Farm in Havant, Hampshire. It is anticipated that the new CHP plants will increase electricity generation by 17 per cent. Tony Fenton, Joint Managing Director, Edina Group, comments: “As the sole UK and Ireland distributor for market-leading MWM engines, we are delighted to be awarded the contract at Goddards Green. Our vast knowledge of biogas CHP and working relationship with many water providers makes Edina the perfect choice to deliver Southern Water’s environmental objectives.” www.edina.eu


PARTNERSHIP DEAL FOR AIR


LIQUIDE AND PUREGAS Biogas upgrading specialists Air Liquide and Puregas Solutions have signed an agreement to access their respective biogas upgrading technologies. The duo has


Air Liquide and Puregas Solutions have commissioned their first joint membrane upgrading unit


commissioned its first joint membrane upgrading unit in Rybjerg, northern Denmark, with a capacity of 900m3


per hour of biogas from agricultural waste. Edina has a strong working relationship with a number of water companies


The biomethane upgraded with this technology can be used as fuel for vehicles (bio-NGV). Through Air Liquide’s subsidiary, FordonsGas, the group owns a biomethane liquefier and a network of 48 natural biogas refuelling stations for bio-NGVs covering south-western Sweden. The collaboration with Puregas Solutions also allows Air Liquide to continue its biogas development in the Nordic countries. www.airliquide.com www.puregas-solutions.com See Technology Focus: Biogas upgrading, p18


www.adbioresources.org adbioresources.org SPRING 2017 | AD & BIORESOURCES NEWS 27


Harper Adams University has conducted research into how to reduce the number of resilient pathogens in porcine carcass material (PCM). The research has shown that sterilising and then disposing of the pig carcasses through anaerobic digestion could generate considerable quantities of biogas for heat or electricity, as well as reducing the cost of fallen stock collection and movement of vehicles between farms. The research is important due to EU legislation that was introduced after the BSE epidemic in cattle, which prohibits farmers from burying fallen stock on farms. Robert Wilkinson, Principal Lecturer and Researcher, said: “The results of this project confirm that PCM can be effectively digested by AD, with high levels of biogas and [methane] production and carcass reduction. However, further research is required to test the stability of the protocol over a longer period of time and to evaluate the residue produced as a potential fertiliser or soil improver.” www.harper-adams.ac.uk


Disposing of pig carcasess through AD could generate large quantities of biogas


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