蚯蚓土壤填料生态滤池处理生活污水

采用二级蚯蚓土壤填料生态滤池对生活污水进行处理,考察其对污水中各类污染物的去除效果。连续运行90d,试验结果表明:滤池运行稳定,对COD、TP、NH3-N、TN和SS的去除效果良好,平均去除率分别为78.7%、93.4%、74.9%、60.4%和87.5%,出水满足GB 1898—2002《城镇污水处理厂污染物排放标准》二级标准。滤池二级串联结构设计系统稳定,改善了出水水质。蚯蚓在试验初期对滤池环境可较好较快的适应,维持了滤池的稳定运行。土壤生态处理技术工艺简单,兼具经济实用和规模灵活的优点,适合推广。

STUDY ON HYBRID SOIL PACKING VERMIFILTRATION FOR TREATMENT OF DOMESTIC SEWAGE

The experiment adopted a dual-stage hybrid soil packing vermifiltration to evaluate the removal efficiencies ofvarious pollutants in wastewater． The results demonstrated that when the vermifiltration operated for 90 days continuously，theremoval efficiency of multistage earthworm ecofilter on COD，TP，NH3 － N，TN and SS was 78. 7%，93. 4%，74. 9%，60. 4% and 87. 5% respectively． And the effluent quality met the level Ⅱ standards of“Discharge Standard of Pollutants forMunicipal Wastewater Treatment Plant”( GB 18918—2002) ． The design of vermifiltration with secondary structure improvedthe stability of sewage treatment and the quality of final effluent． The earthworms adapted the vermifiltration well at the earlystage． The quantity and average weight of the earthworms increased obviously，indicating that the earthworms had goodadaptability，growth and reproduction in vermifiltration，which could ensure the stability of vermifiltration． This technology hasadvantages of simple process，good treatment efficiency，environment friendly，low investment and flexible scale，thuspossessing good application prospect．