Optimum operation conditions of direct capillary nanofiltration for wastewater treatment
Optimum operation conditions of direct capillary nanofiltration for wastewater treatment
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DOI：
10.1016/j.desal.2006.07.014
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发表时间：
2007-08-15
期刊：
影响因子：
9.9
通讯作者：
Moerman, C.
中科院分区：
文献类型：
--
作者：
Sayed, S.;Tarek, S.;Moerman, C.
直接毛细管纳滤技术是一种无需预处理，一步完成的地表水和废水处理新技术。CNF膜组件结合了毛细管超滤膜的良好清洁性能和纳滤膜在去除DOC、颜色、细菌、病毒和农药方面的良好分离性能。将直接CNF应用于Twente运河地表水，以在一个步骤中产生高质量的渗透物。在这项研究中，直接CNF已被应用（第一次）在连续和稳定的工艺条件下的废水处理。一个重要方面是确定中试装置的最佳操作条件。直接CNF处理生活污水的最佳工艺条件为：过滤时间15 min，通量20 l/m（2）·h。过滤可以在稳定的工艺条件下连续操作约8小时。随后，由于膜纤维的污染，必须对中试装置进行化学清洁。CNF对COD、BOD、铁、磷酸盐、细菌总数等指标的去除率较高，对锰的去除率较低，而对氨氮的去除率很低。
DirectCapillary Nanofiltration (Direct CNF) is a new technique used for surface water and waste water treatment in one step without pre-treatment. The CNF membrane module combines the favourable cleaning properties of capillary ultrafiltration membranes with the favourable separation properties of nanofiltration membranes in terms of removal of DOC, colour, bacteria, viruses and pesticides. Direct CNF was applied to Twente Canal surface water to produce high quality permeate in a single step. In this study, Direct CNF has been applied (for the first time) to wastewater treatment under continuous and stable process conditions. An important aspect was determination of the optimum operation conditions of the pilot plant. The optimum conditions for Direct CNF when applied to domestic wastewater are 15 minutes filtration time, 20 l/m(2).h flux rate with undiluted domestic wastewater. The filtration can operate continuously under stable process conditions for approximately 8 hours. Subsequently the pilot plant must be chemically cleaned due to contamination of the membrane fibres. CNF shows high retention in removal of some parameters such as COD, BOD, iron, phosphate, total bacterial counts and lower retention for removal of Manganese while the removal of ammonia was very low.