Journal of Environmental Engineering Technology ›› 2012, Vol. 2 ›› Issue (1): 7-12.doi: 10.3969/j.issn.1674-991X.2012.01.002

• Water Pollution Control Technology and Resource Utilization • Previous Articles     Next Articles

Treatment and Reuse of Wastewater in Synthetic Rubber Production by a Full Scale MBR-UF-RO System

ZHANG Yan1,ZHENG Wei2,LIU Rui2,LI Wei3,MA Min-jie3,LI Ying2,3,CHEN Lü-jun1,2*   

  • Received:2011-10-05 Revised:2011-11-13 Online:2012-01-20 Published:2011-12-29
  • Contact: CHEN Lü-jun E-mail:chenlj@mail.tsinghua.edu.cn

Abstract: The wastewater produced from a rubber synthesis plant was treated by an advanced process of membrane bioreactor-ultra filtration-reverse osmosis (MBR-UF-RO) for reuse. 1 181 m3/d of the production wastewater flowed in the MBR with influent CODCr in the range of 158-451 mg/L (258 mg/L in average). The hydraulic retention time (HRT) of the MBR was 5 h. The MBR effluent, with CODCr in the range of 5-101 mg/L (31 mg/L in average) and turbidity less than 0.2 NTU, could meet the influent requirements of UF. On-line chemical cleaning was carried out with alternation of high and low reagent concentration every 15 d, which effectively controlled the membrane fouling. The MBR effluent was mixed with 430 m3/d of circulating cooling wastewater, and further treated by the UF and RO. The conductivity of the RO effluent was steadily 30-45 μS/cm, which was qualified to be reused as circulating cooling water. The reuse rate of total wastewater treated was 62.8% within the plant, and the operation cost of the advanced treatment was 4.34 RMB/m3.

Key words: synthetic rubber, advanced treatment, wastewater reuse, MBR, UF, RO