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Upgrading VFAs bioproduction from waste activated sludge via co-fermentation with soy sauce residue |
Yanqing Duan, Aijuan Zhou1,2(), Kaili Wen2, Zhihong Liu1, Wenzong Liu3, Aijie Wang3,4, Xiuping Yue1,2() |
1. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2. Shanxi Engineer Research Institute of Sludge Disposition and Resources, Taiyuan University of Technology, Taiyuan 030024, China 3. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 4. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin 150091, China |
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Abstract SSR addition upgraded VFAs production from WAS. Structure modification by pretreatments led to performance distinctions. Distinctions in microbial community was observed by pretreatments selection. Up to 0.49‒0.65 billion €/year of market value potential was preliminary estimated. Conditioning of extra carbon sources has been widely reported to facilitate fermentation of waste activated sludge (WAS). Soy sauce residue (SSR) was a relatively untapped carbon source for sludge conditioning. This batch study aimed to evaluate the possible implementation of SSR for volatile fatty acids (VFAs) production from WAS. To upgrade the bioavailability of feedstock, three typical pretreatment methods were conducted, i.e., ammonium hydroxide (AH), sulfuric acids (SA) and thermal assisted alkaline (TA). AH pretreated test (AH-PT) outperformed due to a relatively strong structure decomposition of cellulosic materials as revealed by infrared spectroscopic analysis and crystal index. As a result, performed a high hydrolysis rate of 4449 mg COD/d, 1.12-1.23-fold higher than that in TA and SA pretreated tests (TA-PT and SA-PT), and 7.8-fold higher than that in the Control test. Meanwhile, a volatile fatty acids (VFAs) contribution of 401.2 mg COD/g SSR∙L and a maximum acidification rate of 3.59 d-1 was recorded, with a high sum proportion of mall molecular acetic and propionic 82.2%, 11% ‒70% increase over the other three tests. Besides, speciation process characterized with functional genus differentiation was identified by microbial diversity and distribution investigation and canonical correspondence analysis (CCA). Finally, a potential market value of 0.49‒0.65 Billion €/year was preliminary estimated, showing promise of resource recovery from both WAS and SSR instead of extensive disposal.
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Keywords
Waste activated sludge (WAS)
Soy sauce residue (SSR)
Sludge conditioning
Volatile fatty acids (VFAs)
Microbial diversity
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Corresponding Author(s):
Aijuan Zhou,Xiuping Yue
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Issue Date: 26 October 2018
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