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The 8th Conference of the UK Wastewater Network focused on the circular economy - talks on resource recovery (microbial protein and coagulant), ammonia to energy conversion, biosolids to land carbon accounting, and an examination of microplastics impacts.
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In 2019, the UK introduced its 2050 net zero target amendment to the Climate Change Act (2008). A year on, the Committee on Climate Change’s 2020 progress report revealed that the UK is already far off-course, with just 1 of 25 critical policies delivered.
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The MBR plant at Kaarst-Nordkanal has been in operation for 15 years. In addition to various process optimisation procedures, it was refurbished with a new anaerobic digestor (AD) in March 2019.
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Emphasis on the circular economy and extracting value from waste has focused attention on the pathogen content of biosolids (i.e. treated wastewater sludge) intended for reuse in agriculture, based primarily on E. coli as an indicator micro-organism.
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Biochar is the organic solid char product from biomass pyrolysis, i.e. thermal treatment in a (mostly) oxygen-free atmosphere. It has many potential uses, e.g. as an adsorbent for pollutant removal, but its main application is in agriculture.
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A comparison of anaerobic digestion and combustion with two more novel oxygen-deficient thermochemical processes (pyrolysis and gasification) for resource recovery from sewage sludge reveal the challenges to the implementation of these technologies.
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