城市污水人工土快滤处理系统的进水水质条件研究

Influent Quality of Rapid Infiltration System Using Artificial Soil for Treating Municipal Wastewater

利用人工土柱和中试工程开展了人工土快滤处理系统的进水水质试验。试验结果表明,人工土滤床对进水SS浓度要求较严,其允许值为60—80mg·L-1,中试工程前处理构筑物对SS去除率高达75%,处理系统进水SS浓度可达220—390mg·L-1。人工土滤床冬季进水BOD5浓度要求在180mg·L-1以下,处理系统进水BOD5浓度可达250—500mg·L-1。人工土滤床最佳进水COD浓度为200—300mg·L-1,处理系统进水COD浓度为400—700mg·L-1。

An influent quality experiment of artificial soil rapid infiltration s ystem has been conducted by using both soil column and pilot-scale plant filled with artificial soil. The result showed that the requirement of artificial soil filter for influent SS concentration was stringent, and its permissive range wa s in 60—80 mg·L-1. As the removal efficiency of preliminary treatment constru cts of pilot-scale plant for SS was about 75%, the range of influent SS concen tration for treatment system was in a range of 220—390 mg·L-1. The range of i nfluent BOD5 concentration for treatment system was 250—500 mg·L-1, but it mu st be low than 180 mg·L-1 for artificial soil filter in winter. The range of i nfluent COD concentration for treatment system was 400—700 mg·L-1, and the op timum influent COD concentration for artificial soil filter was 200—300 mg·L- 1.