ABSTRACT

In the present study, electro-coagulation (EC) with stainless steel (SS) electrodes has been used as a pretreatment process before the reverse osmosis (RO) for the biologically treated distillery spent wash. The optimized operating parameters (pH, time, current, and electrode distance) for the EC process were obtained from the previous study. EC treated wastewater was further used as a feed for the RO system. RO membrane system operating parameters (pH, temperature, and trans-membrane pressure) were optimized by employing response surface methodology. Optimized conditions for the RO process were found to be: pH (pH_o): 6.12; temperature (T): 20°C and trans-membrane pressure (TMP): 45.7 bar. The combined (EC-RO) process showed 98%, 99.2%, and 98.5% of COD, color, and TDS removal, respectively, with permeate flux of 40.5 L/m²/h (EC-RO). Experimental results indicated that EC followed by RO could be used as an additional step for biologically treated spent wash treatment to improve the treated effluent quality and membrane life. Results also revealed that the techno-economic performance of combined (EC-RO) treatment in terms of total annual water production is more efficient and economical than RO alone.

摘要

在本研究中，不锈钢 (SS) 电极的电凝 (EC) 已被用作反渗透 (RO) 之前的预处理工艺，用于生物处理的酒厂用过的洗涤液。EC 工艺的优化操作参数（pH、时间、电流和电极距离）从先前的研究中获得。EC 处理的废水进一步用作 RO 系统的进料。RO 膜系统操作参数（pH、温度和跨膜压力）通过采用响应面法进行了优化。发现 RO 工艺的优化条件为：pH（pH _o): 6.12; 温度 (T)：20°C 和跨膜压力 (TMP)：45.7 bar。联合 (EC-RO) 工艺分别显示 98%、99.2% 和 98.5% 的 COD、颜色和 TDS 去除率，渗透通量为 40.5 L/m ² /h (EC-RO)。实验结果表明，EC 和 RO 可以作为生物处理废洗涤处理的附加步骤，以提高处理后的出水质量和膜寿命。结果还表明，就年总产水量而言，联合（EC-RO）处理的技术经济性能比单独的 RO 更有效和经济。