蚯蚓引入垂直流-水平潜流湿地混流系统处理沼液的效果

发布时间：2018-10-21 16:17

【摘要】：为了避免或减少人工湿地处理厌氧发酵液发生堵塞,并提高系统处理效果,该试验将蚯蚓引入到垂直流湿地系统中,并与水平潜流湿地构成混流系统,用来处理厌氧发酵液。结果表明:采用蚯蚓垂直流湿地-水平潜流湿地混流系统处理厌氧发酵液,在进水平均有机负荷达1.82 kg/(m~2·d),水力负荷10、20 cm/d的条件下,对化学需氧量、总磷、总悬浮固体的去除率达到了90%以上,氨氮去除率达80%以上,总氮去除率也维持在60%以上。提高水力负荷对污染物的消减量更有优势,水平潜流湿地对总氮的消减优于蚯蚓生态湿地。2种水力负荷下,混流湿地出水化学需氧量、氨氮、总磷、总悬浮固体均能达到《畜禽养殖业污染物排放标准》要求。蚯蚓使混流系统对化学需氧量、氨氮、总凯氏氮的去除分别提高了2%、12%、4%,同时具有同步处理污水污泥,缓解湿地堵塞的效果,处理水质基本达标,处理污泥的成本也大大降低,因此具有很大应用潜力。
[Abstract]:In order to avoid or reduce the clogging of anaerobic fermentation broth in constructed wetland treatment and improve the treatment effect of the system, the experiment introduced earthworm into vertical flow wetland system, and formed a mixed flow system with horizontal subsurface flow wetland to treat anaerobic fermentation broth. The results showed that the anaerobic fermentation broth was treated by the mixed flow system of vertical-flow wetland and horizontal subsurface flow wetland of earthworm. Under the condition of average organic load of 1.82 kg/ (m ~ (2) d),) and hydraulic load of 10 ~ 20 cm/d, the chemical oxygen demand (COD) and total phosphorus (TP) were measured. The removal rate of total suspended solids is over 90%, the removal rate of ammonia nitrogen is more than 80%, and the removal rate of total nitrogen is above 60%. The reduction of total nitrogen in horizontal subsurface flow wetland is better than that in earthworm ecological wetland. Under two hydraulic loads, the effluent chemical oxygen demand (COD), ammonia nitrogen (NH3-N), total phosphorus (TP) of mixed flow wetland are better than that of earthworm ecological wetland. The total suspended solids can meet the emission standard of pollutants in livestock and poultry breeding industry. The removal of chemical oxygen demand (COD), ammonia nitrogen (NH3-N) and total Kjeldahl nitrogen (TKN) in the mixed flow system by earthworms has increased by 2 / 12 / 12 / 4 respectively. At the same time, it has the effect of simultaneous treatment of sewage sludge, alleviating the blocking of wetlands, basically meeting the standard of water quality, and greatly reducing the cost of sludge treatment. Therefore, it has great application potential.
【作者单位】：中国农业大学资源与环境学院;
【基金】：国家自然科学基金(利用农艺措施调控蚯蚓种群原位控制土壤病原生物及机理研究,20110008130003) 国家“十二五”科技支撑计划(农业废弃物高效循环利用关键技术研究,2012BAD14B01)
【分类号】：X713

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