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Membrane Water Treatment   Volume 9, Number 1, January 2018, pages 17-21
DOI: https://doi.org/10.12989/mwt.2018.9.1.017
 
Treatment of natural rubber wastewater by membrane technologies for water reuse
Shi-Kuan Jiang, Gui-Mei Zhang, Li Yan and Ying Wu

 
Abstract     [Buy Article]
    A series of laboratory scale experiments were performed to investigate the feasibility of membrane separation technology for natural rubber (NR) wastewater treatment and reuse. Three types of spiral wound membranes were employed in the cross-flow experiments. The NR wastewater pretreated by sand filtration and cartridge filtration was forced to pass through the ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) membranes successively. The UF retentate, which containing abundant proteins, can be used to produce fertilizer, while the NF retentate is rich in quebrachitol and can be used to extract quebrachitol. The permeate produced by the RO module was reused in the NR processing. Furthermore, about 0.1wt% quebrachitol was extracted from the NR wastewater. Besides, the effluent quality treated by the membrane processes was much better than that of the biological treatment. Especially for total dissolved solids (TDS) and total phosphorus (T-P), the removal efficiency improved 53.11% and 49.83% respectively. In addition, the removal efficiencies of biological oxygen demand (BOD) and chemical oxygen demand (COD) exceeded 99%. The total nitrogen (T-N) and ammonia nitrogen (NH4-N) had approximately similar removal efficiency (93%). It was also found that there was a significant decrease in the T-P concentration in the effluent, the T-P was reduced from 200 mg/L to 0.34 mg/L. Generally, it was considered to be a challenging problem to solve for the biological processes. In brief, highly resource utilization and zero discharge was obtained by membrane separation system in the NR wastewater treatment.
 
Key Words
    natural rubber wastewater; ultrafiltration; nanofiltration; reverse osmosis; quebrachitol
 
Address
Shi-Kuan Jiang, Gui-Mei Zhang, Li Yan and Ying Wu: Yunnan Institute of Tropical Crops, Jinghong, Yunnan, China
 

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