气候条件对浮萍放养体系净化养猪场废水的影响

目的]考察模拟气候条件对浮萍放养体系净化养猪场废水的影响。方法]设置浮萍单种和浮萍-水花生、浮萍-水葫芦混养3种体系,并以不加入植物的各水样为对照组,监测各体系中植物的生长情况及供试植物对污染物去除的贡献。结果]结果表明,浮萍单种体系及混养体系对养猪场废水的处理效果受气候条件影响,但程度不同,前者较为明显。冬季低温条件下体系中污染物的总去除率出现较大下降,浮萍均呈现一定程度的减重;混养体系中污染物的总去除率也有一定程度的降低,但降幅不大,尤其是浮萍-水花生混养体系,其对供试废水COD、NH4+-N和TP的总去除率维持在80%左右。提出宜根据季节变化选用不同浮萍放养体系。结论]该研究为浮萍污水处理系统在全年气候条件下的运行提供借鉴。

Influence of Climate Condition on Decontaminating Swine Wastewater by Duckweed-Cultured Systems

Objective]The research was to review effect of simulated climate condition on decontaminating swine wastewater by duckweed-cultured systems.Method]The three systems of single species of duckweed,accrete systems of duckweed-alternanthera philoxeroids and duckweed-water hyacinth were intercalated.With all kinds of water sample of having no plants as CK,the growth of all plants and the contribution of experiment plants to contamination elimination were in vestigated.Result]The results showed that treatment effect were influenced by climate conditions,while there were some differences.The total removal rates of pollutants and the wet weights of duckweeds in the single species of duckweed system all decreased greatly under the winter weather condition,while there were lower decreases in the accrete systems,especially for the system cultured with duckweedalternanthera philoxeroids,in which the total removal rates of chemical oxygen demand(COD),ammonia nitrogen(NH4 -N) and total phosphorus(TP) still remained about 80%.It was presented that duckweed-cultured systems should be selected for decontaminating swine wastewater in different seasons.Conclusion]This study can be a reference for the operation of the treating systems based on duckweed under an annual climate condition of the year.