不同工艺再生水补给对景观湖水质变化的影响

再生水回用于景观水体过程中,为了比较不同再生水工艺对景观水体富营养化的影响,以"二级出水+BAF+O3+GFH"和"二级出水+O3"作为再生水处理工艺,以岸滤(bank filtration,BF)作为水质维持工艺,进行再生水景观水体水质保障技术研究。结果表明,"二级出水+O3"出水流量较大,水力流动快,每天运行24 h,平均出水流量25.5 m3/d,氮磷含量偏高;"二级出水+BAF+O3+GFH"出水的氮磷指标控制在较低水平,GFH出水流量8～14 m3/d,水力流动较缓,湖中出现蓝藻。2套系统中BF对NH4+-N的去除率分别为30.5%和20.8%。"二级出水+O3+BF"系统中人工湖进水TN平均浓度24.309 mg/L,TP平均浓度0.583 mg/L,N/P=41,适宜水网藻生长,对湖中N(主要是NH4+-N)、P有较强的去除能力;"二级出水+BAF+O3+GFH+BF"系统中人工湖进水TP<0.05 mg/L,适宜蓝藻生长。

Effect of recharge of reclaimed water with different processes on water quality change of landscape lake

In the process of reclaimed water reused for landscape,in order to compare the effect on quality change of landscape lake recharged by reclaimed water with different processes,"municipal secondary effluent+BAF+ozonation+GFH" and "municipal secondary effluent + ozonation" were used as reclaimed water treatment processes respectively,while bank filtration was used as landscape quality maintenance technology,then the technology of reclaimed water quality control for landscape was studied.The result showed that the discharge of effluent of "municipal secondary effluent+ozonation" was larger which caused water flew fast.The average water flow was 25.5 m3/d when the system run 24 hours everyday.However,the concentrations of nitrogen and phosphorus were both higher.For the effluent of "municipal secondary effluent + BAF + ozonation + GFH",the concentrations of nitrogen and phosphorus were controlled at lower level.The effluent flow of GFH ranged from 8 to 14 m3/d,which led to slow water flow.Algae were detected in artificial lake.The removal rates of NH+4-N were 30.5% and 20.8%,respectively by BF in two systems.In the system of "municipal secondary effluent + ozonation",the TN average concentration of artificial lake influent was 24.309 mg/L,TP was 0.583 mg/L and N/P was 41 which were suitable for growth of hydrodictyon reticulatum.Hydrodictyon reticulatum had strong removal ability of nitrogen(mainly NH+4-N) and phosphorus in lake.In the system of "municipal secondary effluent + BAF + ozonation + GFH",TP concentration of artificial lake influent was less than 0.05 mg/L,which was suitable for growth of cyanobacteria.