Alkaline textile wastewater biotreatment: A sulfate-reducing granular sludge based lab-scale study

Qian Zeng, Tianwei Hao, Hamish Mackey, Li Wei, Gang Guo, Guanghao Chen

Research output: Contribution to journalArticle

14 Citations (Scopus)

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 500–3000 mg/L. COD removal efficiency was reduced at high COD concentration, while specific removal rate was enhanced to 17.5 mg-COD/g VSS h−1. HE-7B removal was also improved at higher organic strength with more than 90% removal efficiency and a first-rate removal constant of 5.57 h−1 for 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.

Original languageEnglish
Pages (from-to)104-111
Number of pages8
JournalJournal of Hazardous Materials
Volume332
DOIs
Publication statusPublished - 15 Jun 2017

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Keywords

  • Alkaline condition
  • Azo dye
  • Sulfate-reducing granular sludge

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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