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Nitrogenous organics in sewage sludge: New insights into bottlenecks of anaerobic transformation by Jun Gao; Sisi Chen; Lei Li; Shijie Yuan; Jing Sun; Xiaojie Sun; Bin Dong is a Engineering article available to read on EtoBox.

What is Nitrogenous organics in sewage sludge: New insights into bottlenecks of anaerobic transformation about?

As the most crucial carrier of carbon and nitrogen in sludge, nitrogenous organics, are essential in governing the efficiency of sludge anaerobic digestion (AD). An in-depth understanding of the anti-degradation mechanism of nitrogenous organics in sludge at various occurrence states is needed. This study classified nitrogenous organics in sludge into extracellular nitrogenous organics (e-NO) and intracellular nitrogenous organics (i-NO). Further, it identified the hindrances of anaerobic degradation of e-NO and i-NO in sludge by comparing the structural and AD performance differences between sludge and other nitrogen source substrates (food waste, straw, chicken manure, soybean, and beef). Experimentally, soybean and beef (with excellent e-NO degradation rates) and chicken manure (with excellent i-ON degradation efficiency) were further compared. We found that the relative abundance of peptidase genes in sludge was generally lower than in soybean and beef. Also, the pyruvate (a volatile fatty acid precursor) metabolism of some amino acids (Gly, Ala, Phe) with high content was inactive. Refractory hydrolysis and incomplete fermentation of nitrogenous organics in sludge are the main

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Author

Jun Gao; Sisi Chen; Lei Li; Shijie Yuan; Jing Sun; Xiaojie Sun; Bin Dong

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)