Comparison of MBR/RO and UF/RO hybrid systems for the treatment of coke-oven effluents

摘要

The toxic industrial coke-oven effluent treatability using ultrafiltration (UF) and membrane bioreactor (MBR) technology with reverse osmosis (RO) was tested through pilot studies due to the inherent advantages of the membrane processes over conventional systems in treatment of high-strength wastewaters. The treatment was analyzed for the removal of cyanide, phenol, and chemical oxygen demand. Pre-treatment of the wastewater before RO was tested using MBR and UF. The MBR was chosen for the pre-treatment as it showed a higher treatment efficiency through aeration-enhanced biodegradation and also as the SDI was below 2.3. The final rejection of cyanide in the RO permeate was above 90%, phenol above 95%, and total suspended solids was 100%. Thus, the permeate quality was found satisfactory and the process may be adopted at full-scale for treatment of coke-oven wastewater at the industry.