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A two-fiber, bench-scale test of ultrafiltration (UF) for investigation of fouling rate and characteristics

机译:用于研究结垢速率和特性的超滤(UF)两纤维台式规模测试

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摘要

Experimental results are presented for a two-fiber, bench-scale test that was designed to evaluate the effect of setpoint flux, backwash frequency, and backwash time on long-term fouling rate of low-pressure membrane systems. An ultrafiltration (UF) membrane was used to treat granular-media filtered, secondary wastewater effluent. The fouling rate was measured by the decline in specific flux over many backwash cycles. The long-term fouling rate was decreased substantially by a modest lowering of setpoint flux from 65 to 50 L/(m~2 h) and by an increase in backwash frequency from 15 to 10 min. Increasing the backwash time from 30s to 1 min did not decrease the fouling rate substantially. Microscopic observation and chemical analysis suggest that the extracellular polymeric substances (EPS) play an important role in fouling resistance for UF membranes treating secondary wastewater effluent. Both adsorption inside membrane pores and deposition on the membrane surface may occur. The comparison of bench-scale and pilot-scale test also shows that the two-fiber, bench-scale test is a very useful, first-cut approach for acquiring process design information for pilot-scale and full-scale operation.
机译:给出了两纤维台式规模试验的实验结果,该试验旨在评估设定流量,反冲洗频率和反冲洗时间对低压膜系统长期结垢率的影响。超滤(UF)膜用于处理经颗粒介质过滤的二次废水。通过在许多反洗循环中比通量的下降来测量结垢率。通过将设定流量从65 L /(m〜2 h)适度降低,以及将反冲洗频率从15 min增加到10 min,可以大大降低长期结垢率。将反洗时间从30s增加到1分钟并没有显着降低结垢率。显微镜观察和化学分析表明,细胞外聚合物(EPS)在超滤膜处理二次废水中的抗结垢性中起重要作用。膜孔内部的吸附和在膜表面上的沉积都可能发生。实验室规模测试和中试规模测试的比较还表明,两纤维实验室规模测试是一种非常有用的,最先入手的方法,用于获取中规模和全规模操作的过程设计信息。

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