双膜法处理污水厂出水用于工业回用

青岛市黄岛区属于严重缺水地区,水资源短缺已成为制约地区经济发展的瓶颈,拟以污水厂合格出水为原水,实现中水精制满足工业用水需求。精制中水回用站占地为1. 86 hm²,项目采用BOO形式,总投资为2. 1亿元,以污水厂达到一级A标准的出水为原水,为黄岛区北部工业园区用水大户供水。设计产水量为20 000 m³/d,设计进水量为34 776 m³/d,设计外排水量为14 616 m³/d。回用站分为产水、浓水及污泥三个系统,产水系统以高效石灰软化沉淀池、超滤、两级反渗透为核心,设计总回用率为57. 49%,脱盐率> 98%,TDS≤100 mg/L;浓水系统以活性炭沉淀池为核心,出水达到一级A标准;污泥系统采用板框压滤机,污泥含水率<80%后外运。系统实际运行效果良好,达到设计要求。

Treatment of Wastewater Treatment Plant Effluent by UF-RO for Industrial Reuse

Huangdao District of Qingdao was a serious water-deficient area,and the shortage of water resources became a bottleneck restricting the economic development of the region.It was proposed to use the qualified effluent of the wastewater treatment plant as the raw water to achieve the purification of reclaimed water to meet the industrial water demand.The refined water reuse station covered an area of 1.86 hm^2,in the form of BOO with a total investment of 210 million yuan.The refined water reuse station,used WWTP first grade A standard effluent as raw water,supplied water to the large water users in the northern industrial zone of Huangdao District.The designed water production was 20000 m^3/d,the designed inlet water was 34776 m^3/d,and the designed external drainage was 14616 m^3/d.The recycling station was divided into three systems including water production,concentrated water and sludge.The water production system used high-efficiency lime softening sedimentation tank,ultrafiltration,two-stage reverse osmosis as the core stage,the total reuse rate was 57.49%,the salt rejection rate>98%,and TDS≤100 mg/L.The concentrated water system took the activated carbon sedimentation tank as the core stage,and the effluent reached the first grade A standard;the sludge system adopted the plate and frame filter press,and the sludge water content<80%.The actual operation effect was good and met the design requirements.