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Insight Into Effects of Electro-dewatering Pretreatment on Nitrous Oxide Emission Involved in Related Functional Genes in Sewage Sludge Composting by Wang, Ke; Wu, Yiqi; Wang, Zhe; Wang, Wei; Ren, Nanqi is a Engineering article available to read on EtoBox.

What is Insight Into Effects of Electro-dewatering Pretreatment on Nitrous Oxide Emission Involved in Related Functional Genes in Sewage Sludge Composting about?

Electro-dewatering (ED) pretreatment could improve sludge dewatering performance and remove heavy metal, but the effect of ED pretreatment on nitrous oxide (N 2 O) emission and related functional genes in sludge composting process is still unknown, which was firstly investigated in this study. The results revealed that ED pretreatment changed the physicochemical characteristics of sludge and impacted N 2 O related functional genes, resulting in the reduction of cumulative N 2 O emission by 77.04% during 60 days composting. The higher pH and NH 4 + -N, but lower moisture, ORP and NO 2 --N emerged in the composting of ED sludge compared to mechanical dewatering (MD) sludge. Furthermore, ED pretreatment reduced amoA, hao, narG, nirK and nosZ in ED sludge on Day-10 and Day-60 of composting. It was found that nirK reduction was the major factor impacting N 2 O generation in the initial composting of ED sludge, and the decline of amoA restricted N 2 O production in the curing period.

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Author

Wang, Ke; Wu, Yiqi; Wang, Zhe; Wang, Wei; Ren, Nanqi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0960-8524)

Published

2018

Language

EN

Field

Engineering (Physical Sciences)