Bioaugmentation Strategy for Treatment of Sulfur Black Wastewater Through Sequential Fenton Oxidation and Biological Process by Two Sulfide-oxidizing Strains

Abstract

In order to develop an affective bioaugmentation strategy for the removal of sulfur black and increase sulfide-oxidization capability in biological treatment, bioaugmentation strains with higher sulfide-oxidizing capability, Acinetobacter sp. DS-9 and Aspergillus sp. DS-28, were isolated from a municipal wastewater (WW) treatment plant and selected to treat textile sulfur dyeing WW combined with Fenton oxidation. The sequential WW treatment process was evaluated in a bench-scale activated sludge tank. The performance of the bioreactor demonstrated the feasibility of bioaugmentation by strain DS-9 and DS-28 in terms of almost sulfur black removal, COD and color removal, significant sulfide removal in activated sludge. The effect of Fenton oxidation process, additional carbon source, bioaugmentation strains composition etc. was investigated. The bioaugmented process after Fenton oxidation and inoculation of DS-9 and DS-28 could maintain stable performance in terms of COD, color and sulfur removal from the WW. The capability of color and COD removal by bioaugmentation strains were greater than that by the original activated sludge from WW treatment plant. Sulfate concentration increased significantly from 140.5 to 485 mg L-1. The outlet color and COD value reach 5 and 46.52 mg L-1 after the sequential Fenton oxidation and bioaugmentation treatment.