Biological sulfate removal from acrylic fiber manufacturing wastewater using a two-stage UASB reactor

• Published in: Journal of environmental sciences (China) Vol. 24; no. 2; pp. 343 - 350
• Main Authors: Li, Jin, Wang, Jun, Luan, Zhaokun, Ji, Zhongguang, Yu, Lian
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.02.2012; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences, Beijing 100085, China
• Subjects: a two-stage UASB reactor; Bacteria; Biological Oxygen Demand Analysis; Bioreactors - microbiology; Crack opening displacement; Fibers; fluorescence in situ hybridization (FISH); granule; In Situ Hybridization, Fluorescence; manufacturing; methane production; Microbial Consortia; Microorganisms; Sludge; sulfate-reducing bacteria; Sulfates; Sulfates - isolation & purification; sulfidogenesis; Textile Industry; UASB reactors; UASB反应器; upflow anaerobic sludge blanket reactor; Waste Disposal, Fluid - methods; Waste water; wastewater; Water Pollutants, Chemical - isolation & purification; 产甲烷; 微生物; 水力停留时间; 污泥颗粒; 生产废水; 硫酸盐还原菌; 腈纶; granule; sulfidogenesis; fluorescence in situ hybridization (FISH); a two-stage UASB reactor
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(11)60772-9

A two-stage UASB reactor was employed to remove sulfate from acrylic fiber manufacturing wastewater.Mesophilic operation（35±0.5℃） was performed with hydraulic retention time（HRT） varied between 28 and 40 hr.Mixed liquor suspended solids（MLSS） in the reactor was maintained about 8000 mg/L.The results indicated that sulfate removal was enhanced with increasing the ratio of COD/SO24-.At low COD/SO42-,the growth of the sulfate-reducing bacteria（SRB） was carbon-limited.The optimal sulfate removal efficiencies were 75% when the HRT was no less than 38 hr.Sulfidogenesis mainly happened in the sulfate-reducing stage,while methanogenesis in the methane-producing stage.Microbes in sulfate-reducing stage performed granulation better than that in methaneproducing stage.Higher extracellular polymeric substances（EPS） content in sulfate-reducing stage helped to adhere and connect the flocculent sludge particles together.SRB accounted for about 31% both in sulfate-reducing stage and methane-producing stage at COD/SO42-ratio of 0.5,while it dropped dramatically from 34% in sulfate-reducing stage to 10% in methane-producing stage corresponding to the COD/SO42-ratio of 4.7.SRB and MPA were predominant in sulfate-reducing stage and methane-producing stage respectively.