title: Improving volatile fatty acid yield from sludge anaerobic fermentation through self-forming dynamic membrane separation.
abstract: Self-forming dynamic membrane (SFDM) separation was applied to the conventional sludge fermenter for improving VFA yields. Results indicated SFDM presented good performance in transferring products, retaining substrates, and enriching useful bacteria. The retention ratios of suspended solids, soluble COD, proteins, and polysaccharides reached 99%, 30%, 70%, and 40%, respectively, and more than 90% of the VFAs and ammonia could be transferred in a timely manner. The structure of the microbial community was optimized, which led to enhanced releases of hydrolytic enzymes and accelerated enrichments of functional bacteria. Protease and β-glucosidase activities increased from 1.0 to 5.0U/mL and 15.0 to 23.0μmol/L·h, respectively. VFA yield and sludge conversion ratio increased by 233.3% and 227.9%, respectively. Moreover, SFDM had good operation stability, including a short formation time, a long operation period, and a low transmembrane pressure. These results show VFA yield from sludge fermentation can be greatly improved by SFDM separation.
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, PR China; Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215011, China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, Jiangsu Province, PR China.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Liu
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, PR China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, PR China.
authors.forename: Bo
authors.initials: B
authors.lastname: Yin
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, PR China.
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, PR China; Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215011, China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, Jiangsu Province, PR China.
authors.forename: Bo
authors.initials: B
authors.lastname: Fu
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, PR China; Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215011, China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, Jiangsu Province, PR China. Electronic address: liuhe@jiangnan.edu.cn.
authors.forename: He
authors.initials: H
authors.lastname: Liu
mesh_terms: D000641:Ammonia / Q000378:metabolism; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D004798:Enzymes / Q000378:metabolism; D004867:Equipment Design; D005232:Fatty Acids, Volatile / Q000378:metabolism*; D005285:Fermentation; D006868:Hydrolysis; D008567:Membranes, Artificial; D059013:Microbial Consortia / Q000502:physiology*; D011134:Polysaccharides / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods
chemical_list: D004798:Enzymes; D005232:Fatty Acids, Volatile; D008567:Membranes, Artificial; D011134:Polysaccharides; D011506:Proteins; D012722:Sewage; D000641:Ammonia
keywords: Anaerobic fermentation; Self-forming dynamic membrane; Separation; Sludge; Volatile fatty acids