蚯蚓生态滤池中蚯蚓与植物对污水净化的作用评估

构建具有不同蚯蚓和植物配置的4个单级蚯蚓生态滤池,依次编号为A(无蚯蚓无植物)、B(有蚯蚓无植物)、C(有蚯蚓栽种芦苇)和D(有蚯蚓栽种水生鸢尾)。通过比较4个滤池在6个月实验期间对化学需氧量(COD)和总氮(TN)的去除效率,系统分析蚯蚓和植物对滤池去除污染物的影响。实验分2个阶段进行:5月上旬至9月上旬,滤池进水碳氮比恒定为6;9月中旬至11月中旬,滤池每周进水碳氮比交替为3、6、9。研究结果表明,蚯蚓对滤池去除COD有一定的促进作用,且作用强度显著受到进水碳氮比的影响。植物的存在与种类对滤池去除COD效率没有显著影响。蚯蚓和植物对滤池的TN去除效率都没有显著影响。滤池进水的碳氮比是显著影响滤池去除TN效率的主要因素。

Evaluation of effects of earthworms and plants in pollutant removal in earthworm ecofilter

COD and TN removal efficiencies of four single-stage earthworm ecofilters with different configurations of earthworms and plants were analyzed during a six-month experiment period to evaluate the effects of earthworms and plants on the ecofilter's pollutant removal performance. The four earthworm ecofilters were labeled as A (without earthworms and plants), B (with earthworms and without plants), C (with earthworms and reeds), and D (with earthworm and irises). The study was carried out in two phases. During the first phase from early May to early September, the carbon to nitrogen ratio of the influent was kept at 6 constantly. During the second phase from mid-September to mid-November, the carbon to nitrogen ratio of the influent alternated among 3, 6, and 9 every week. It was found that earthworms were able to facilitate the ecofilter's removal of COD, and their impacts were influenced by the carbon to nitrogen ratio of the influent. Plants did not have significant impacts on the ecofilter's removal of COD. Neither earthworms nor plants had significant impacts on the ecofilter's removal of TN. Instead, the carbon to nitrogen ratio of the influent could affect the ecofilter's TN removal efficiency significantly.