A novel elemental sulfur reduction and sulfide oxidation integrated process for wastewater treatment and sulfur recycling

作者：Zhang, Yiping; Zhang, Liang; Li, Lianghai; Chen, Guang-Hao; Jiang, Feng^*

来源：Chemical Engineering Journal, 2018, 342: 438-445.

DOI：10.1016/j.cej.2018.02.105

• Organic removal
• Sulfur packed-bed reactor
• Sulfur reducers
• Sludge reduction
• Sulfide-oxidizing bacteria (SOB)
• Sulfur balance

Sulfidogenic processes have been successfully used in saline wastewater treatment for sludge minimization, but are inapplicable in treating sulfate-deficit wastewater. This study reported a novel internal sulfur cycling (ISC) process for sulfate-deficit wastewater treatment. The process consisted of a sulfur-reducing reactor (SRR) for organics removal, followed by a sulfide-oxidizing reactor (SOR) and sedimentation tank for sulfur recovery. Under different hydraulic retention times and organic loading rates, the performance of ISC system was evaluated. The lab-scale ISC system removed 94% of chemical oxygen demand (COD), of which 81% were accomplished in the SRR by sulfur reducers without excessive sludge withdrawal throughout the 200 days of operation. The produced sulfide were mainly re-oxidized back to elemental sulfur in the SOR by sulfide-oxidizing bacteria, and sulfur balance demonstrates that 76% of sulfur recycling were achieved. Cost-benefit analysis reveals that the ISC process is a more cost-effective sludge-minimized biotechnology for sulfate-deficit wastewater treatment compared to conventional activated sludge processes.

• 出版日期2018-6-15
• 单位香港科技大学