MBR-RO组合工艺污水回收中试研究

以A2/O-MBR为预处理工艺,构建了MBR-RO组合系统并用于城市污水的直接处理与回收,考察了MBR工艺作为RO预处理的可行性,评价了RO膜的出水水质,分析了不同操作条件对RO膜的渗透性能及膜污染的影响.研究表明,RO出水平均值为TOC＜1.3 mg/L、NH 4-N＜0.03 mg/L、TN＜0.1 mg/L,TP未检出,电导率和浊度分别小于30μS/cm和0.12 NTU,MBR出水中的无机离子已被RO完全截留,MBR-RO系统具有很高的污染物降解能力和脱盐能力,其出水水质可达饮用水水质标准.MBR作为RO的预处理是完全可行的,连续6个多月的运行中RO膜污染表现不严重.

Pilot Study on Combined MBR-RO Process for Wastewater Recovery

The combined MBR-RO pilot system, using A2/O-MBR technology as a pre-treatment process, has been set up for the direct municipal wastewater treatment and recovery. The objective of this pilot study was to further investigate the feasibility of MBR system as a pretreatment process for RO permeation, estimate the MBR-RO process to produce high grade effluent, and evaluate the different pre-conditions affecting the RO permeability and bio-fouling. The results showed that the average RO permeate qualities were as TOC < 1.3 mg/L, NH4+ -N < 0.03 mg/L, TN < 0.1 mg/L and not detectable for TP, in terms of conductivity < 30 microS/cm and turbidity < 0.12 NTU, and complete inorganic irons rejection could be achieved with the lowest concentration, thus the grade of RO effluent could meet the drinking water standard. MBR technology was suitable as a pre-treatment process for RO in the MBR-RO process and thus no severe RO bio-fouling occurred during the whole study period of 6 months.