重力驱动式微滤对屋面雨水处理效率研究

Performance of Gravity-driven Micro-filtration in Treatment of Roof Rainwater

出水水质、能耗是雨水利用过程中的焦点问题。文章设计了一种实验室规模的重力驱动式膜滤系统,用来处理典型屋面雨水,考察了该工艺对浊度,SS,高锰酸盐指数,NH3-N和UV254的去除效果。结果表明,重力驱动式微滤膜对屋面雨水具备良好的去除效果,浊度和SS的去除率分别达到了81.5%~96.2%,41.7%~69.8%。受限于微滤膜对小分子物质的低截留率,该工艺对高锰酸盐指数,NH3-N与UV254的去除效果不如浊度与SS,去除率分别为16.7%~67.3%,11.1%~57.9%与4.3%~45.7%,但出水依然能稳定达到城市杂用水水质标准。该工艺连续运行30 d无清洗,膜通量稳定在25~40 L/(m2·h)。实验结果表明,单独采用这种简便、无能耗的重力驱动微滤工艺可以高效地处理雨水,对于以非饮用为目的的水处理以及分散供水具备经济适宜性。

Effluent quality and energy consumption are key issues in rainwater utilization.In this study,a lab-scale gravity driven membrane(GDM)micro-filtration system was established for the typical roof rainwater treatment with one month operation,The treatment efficiency of GDM process has been discussed in terms of turbidity,SS,CODMn,NH3-N and UV254.Results showed that the GDM exhibited high efficiency in the treatment of roof rainwater,with removal rate of turbidity and SS as 81.5%~96.2%and 41.7%~69.8%,respectively.Due to the low rejection of low molecular-weight substance,the removal rates of COD,NH3-N and UV254 were 16.7%~67.3%,11.1%~57.9%and 4.3%~45.7%,respectively.Although the removal performance of CODMn,NH3-N and UV254 were undesirable compared to turbidity and SS,the effluent quality can still reach Water Quality Standard for Urban Miscellaneous Water Consumption.Additionally,the permeate flux kept stable with the value of 25~40 L/(m2·h)without cleaning during 30 days operation in the rainwater treatment system.These results indicate that rainwater can be high efficiency treated in a single GDM process with low maintenance,and no energy consumption,which makes this process effective and economical for non-potable rainwater treatment and decentralized water supply.