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Proper treatment of urban sludge dewatering fluid is an urgent problem to be solved during the operation of urban sewage plants. Anaerobic digestion technology has the advantages of reducing pollutants and methane production at the same time, it is an important means of resource utilization of sludge dewatering solution. However, how to improve the methanogenic efficiency of dehydrated fluids and how to deal with the accumulation of fatty acids during anaerobic digestion are currently hot research topics.
In recent years, more and more attention has been paid to the treatment of sludge dewatering liquid by anaerobic process. However, these research results still have great potential for improving the COD removal rate and methane purity of the dehydrated liquid, and the study of the mechanism of mutual metabolism of fatty acids in the process of anaerobic digestion failed to obtain a unified conclusion.
With the support of the National Natural Science Foundation of China and the China-Japan Cooperation Program of the Ministry of Science and Technology, Zhu Gefu's research team of the Anaerobic Biotechnology Group of the Institute of Urban Environment of the Chinese Academy of Sciences proposed the enrichment of fatty acid oxidation in anaerobic systems through biofortification combined with electrochemical technology The symbiosis between bacteria and electro-producing bacteria promotes the anaerobic biological treatment method of dehydration fluid for the fatty acid cascade metabolism, combined with the best enhanced conditions obtained in the previous small-scale research, the feasibility of this academic idea was verified in the pilot test The COD removal rate and methane purity of the dehydration liquid were increased to more than 85% and 90%, respectively, and the economic feasibility was analyzed from the perspective of input and output. The study also used high-throughput sequencing technology to clarify the changes in the microbial community during anaerobic digestion. Finally, the relationship between the electrons of fatty acid oxidizing bacteria, electricity-producing bacteria and methanogens in the fatty acid cascade metabolism is analyzed (Figure 1). The research results provide a reference for the future development of a new type of sludge dewatering anaerobic digestion system.
The results of this study were published in the international journal Water Research under the title of Anaerobic Digestion of Sludge Filtrate Using Anaerobic Baffled Reactor Assisted by Symbionts of Short Chain Fatty Acid-oxidation Syntrophs and Exoelectrogens: Pilot-scale Verification, with Wang Tao as the first author and Zhu Ge Fu is the corresponding author.
Figure 1 The electronic relationship between fatty acid oxidizing bacteria, electricity-producing bacteria and methanogens (1-5 means 5 methanogenic pathways)
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