Xiaodong Xin1, Junguo He1, Wei Qiu2,3. 1. School of Municipal and Environmental Engineering, Harbin Institute of Technology (HIT), Harbin, 150090, China. 2. School of Municipal and Environmental Engineering, Harbin Institute of Technology (HIT), Harbin, 150090, China. qiuweihit@126.com. 3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin, 150090, China. qiuweihit@126.com.
Abstract
This study investigated the acidogenic and microbiological perspectives in the anaerobic co-fermentation of waste-activated sludge (WAS) mixed with corn stalk (CS) and pig manure (PM). The volatile fatty acids (VFAs) increased dramatically to over 5000 mg COD/L accumulation just within 4-5 days with the feedstock carbon to nitrogen (C/N) ratio regulation of 20/1. The CS and PM addition enhanced the compressibility of fermentation residuals by increasing the particle distribution spread index (DSI). Moreover, the external carbon addition conduced to bacterial consortia diversity rising and uneven population distribution in the co-fermentation, which contributed to VFAs accumulation potentially. The organic loading rate (OLR) correlated with bacterial community closely at the early stage (days 1-5), while the oxidation-reduction potential (ORP) and pH played more important roles on bacterial consortia at the terminal stage (days 6-10). The C/N ratio adjustment by CS and PM and proper optimizations of OLR, pH, and ORP at various running stages facilitated VFA accumulation during the co-fermentation operation.
This study investigated the acidogenic and microbiological perspectives in the anaerobic co-fermentation of waste-activated sludge (WAS) mixed with n class="Species">corn stalk (CS) and pig manure (PM). The volatile fatty acids (VFAs) increased dramatically to over 5000 mg COD/L accumulation just within 4-5 days with the feedstock carbon to nitrogen (C/N) ratio regulation of 20/1. The CS and PM addition enhanced the compressibility of fermentation residuals by increasing the particle distribution spread index (DSI). Moreover, the external carbon addition conduced to bacterial consortia diversity rising and uneven population distribution in the co-fermentation, which contributed to VFAs accumulation potentially. The organic loading rate (OLR) correlated with bacterial community closely at the early stage (days 1-5), while the oxidation-reduction potential (ORP) and pH played more important roles on bacterial consortia at the terminal stage (days 6-10). The C/N ratio adjustment by CS and PM and proper optimizations of OLR, pH, and ORP at various running stages facilitated VFA accumulation during the co-fermentation operation.
Authors: M Loreau; S Naeem; P Inchausti; J Bengtsson; J P Grime; A Hector; D U Hooper; M A Huston; D Raffaelli; B Schmid; D Tilman; D A Wardle Journal: Science Date: 2001-10-26 Impact factor: 47.728
Authors: Michael J Morowitz; Vincent J Denef; Elizabeth K Costello; Brian C Thomas; Valeriy Poroyko; David A Relman; Jillian F Banfield Journal: Proc Natl Acad Sci U S A Date: 2010-12-29 Impact factor: 11.205