城市污水处理厂进水水量配置

为了解决大型城市污水处理厂因各处理单元进水水量分配不均匀造成的处理效果欠佳问题,在某处理规模为40万m3/d的污水处理厂内,采用进水水量调节偃均衡各单元水量.考察了水量调节前后生物反应池液位及沿程NH4+-N、NO3--N、NO2--N质量浓度的变化,根据液位测定结果计算各单元流量,水量最大单元的进水水量是水量最小的1.72倍,由于水量分配不均使各单元生物处理效果相差较大.水量均衡前,4个单元NH4+-N出水质量浓度变化为0.22～5.24 mg/L,去除率变化为69.7%～97%.水量均衡后,4个单元出水NH4+-N质量浓度变化为0.60～0.85 mg/L,去除率为93.9%～95.4%.可见水量调节措施均衡了各单元水量,消减了水量不均造成的出水水质变差现象,充分发挥了各反应区的去除作用.

Assignment of the Influent Water Volume in a WWTP

Water quantity adjustment equipment was installed to balance the influent quantity of different paralleling treatment units in a WWTP of 400 000 m3/d to tackle the problem of poor treatment effect resulting from the uneven distribution of influent wastewater to the treatment units of the large-scale WWTP.Water level change and concentrations of NH+4-N、NO-3-N、NO-2-N along the bio-reactor were compared before and after installing the water quantity adjustment equipment.Result shows that the influent water quantity of different paralleling treatment units,which is calculated from the water level,significantly differ.The maximum quantity of influent water is 1.72 times the minimum quantity of influent water.Uneven distribution of influent wastewater results in indistinct difference of biological treatment effect.The effluent NH+4-N concentrations of the bio-reactor are 0.22-5.24 mg/L and 0.60-0.85 mg/L and NH+4-N removal efficiencies are 69.7%-97% and 93.9%-95.4%,respectively,before and after installing the water quantity adjustion equipment.The water quantity is balanced and effluent quality is improved due to the equilibrium of water quantity through the adjustment equipment.