title: Alkaline textile wastewater biotreatment: A sulfate-reducing granular sludge based lab-scale study.
abstract: In this study the feasibility of treating dyeing wastewater with sulfate reducing granular sludge was explored, focusing on decolorization/degradation of azo dye (Procion Red HE-7B) and the performance of microbial consortia under alkaline conditions (pH=11). Efficiency of HE-7B degradation was influenced strongly by the chemical oxygen demand (COD) concentration which was examined in the range of 500-3000mg/L. COD removal efficiency was reduced at high COD concentration, while specific removal rate was enhanced to 17.5 mg-COD/gVSSh-1. HE-7B removal was also improved at higher organic strength with more than 90% removal efficiency and a first-rate removal constant of 5.57h-1for dye degradation. Three dye-degradation metabolites were identified by HPLC-MS. The granular structure provided enhanced removal performance for HE-7B and COD in comparison to a near-identical floc SRB system and the key functional organisms were identified by high throughput sequencing. This study demonstrates an example of a niche application where SRB granules can be applied for high efficient and cost-effective treatment of a wastewater under adverse environmental conditions.
authors.affiliation: Department of Civil & Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: Department of Civil & Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China; Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China; Water Technology Center, The Hong Kong University of Science and Technology, Hong Kong, China; Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Hong Kong, China; Wastewater Treatment Laboratory, FYT Graduate School, The Hong Kong University of Science and Technology, Nansha, Guangzhou, China. Electronic address: thao@connect.ust.hk.
authors.forename: Tianwei
authors.initials: T
authors.lastname: Hao
authors.affiliation: College of Science and Engineering, Hamad Bin Khalifa University, Education City, Doha, Qatar.
authors.forename: Hamish Robert
authors.initials: HR
authors.lastname: Mackey
authors.affiliation: Department of Civil & Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China; Wastewater Treatment Laboratory, FYT Graduate School, The Hong Kong University of Science and Technology, Nansha, Guangzhou, China.
authors.forename: Li
authors.initials: L
authors.lastname: Wei
authors.affiliation: Department of Civil & Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Guo
authors.affiliation: Department of Civil & Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China; Water Technology Center, The Hong Kong University of Science and Technology, Hong Kong, China; Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Hong Kong, China; Wastewater Treatment Laboratory, FYT Graduate School, The Hong Kong University of Science and Technology, Nansha, Guangzhou, China.
authors.forename: Guanghao
authors.initials: G
authors.lastname: Chen
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D005427:Flocculation; D007220:Industrial Waste; D059013:Microbial Consortia; D016999:Sulfur-Reducing Bacteria / Q000378:metabolism*; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D007220:Industrial Waste
keywords: Alkaline condition; Azo dye; Sulfate-reducing granular sludge