慢速渗滤土地处理设计参数的研究

由于慢速渗滤土地处理系统对污水中的有机污染物有较高的去除能力,且城市污水的有机污染物浓度远低于系统的处理负荷量,故系统的设计参数受污水中氮浓度控制.试验表明,BOD_5负荷率高达3.57g/m~2·d仍不会影响系统的工艺性能,但氮负荷率一般不应超过0.6—0.7g/m~2·d.由氮极限值确定的水力负荷率为3—6m/a.在规定的负荷率下,投配水深采用<7cm,4—5天投配一次污水的投配频率是适宜的.

Study on the Design Parameters for Slow Rate Land Treatment

The main design parameters of , slow rate land treatment are hydraulic loading rate, constituent loading rates, application frequency and depth of water applied. As SR systems share better capability of deleting organic contaminants and the organic contaminant contents of municipal wastewater are far below the loading rates of SR system, the desigh parameters of SR system will be dominated by nitrogen concentration of wastewater. Under Kunming experimental conditions. 3.57g/m²·d of BOD₅ loading amount will not affect the process performance, however, nitrogen loading rate abould not exceed 0.6-0.7 g/m²·d. Hydraulic loading rate based on nitrogen limits is 3-6m/a. Under given allowable loading rates, the depth of applied water should be lest than 7 cm and the intervals -between applications range from 4 to 5 days.