纳米生态基对水产养殖污水的处理效果

Effect of nano-ecobase on treatment of aquaculture wastewater

采用三因子四水平的正交设计,实验研究了纳米生态基在不同温度、溶解氧和水力停留时间下对水产养殖污水的处理效果,确定了纳米生态基处理养殖污水的最佳条件。结果表明,含氨氮和亚硝氮浓度较高的模拟养殖污水用纳米生态基挂膜,所需时间约为22 d。纳米生态基对氨氮的去除效果明显,平均去除率达到93.5%。对氨氮去除率的影响程度,水力停留时间>温度>溶解氧。当温度为30℃,DO为5.43 mg/L,HRT为0.33 h时,纳米生态基对氨氮的处理能力最佳,去除率达到94.6%。纳米生态基对亚硝氮的平均去除率为69.3%。对亚硝氮去除率的影响程度,水力停留时间>溶解氧>温度。当温度为21℃,DO为6.40 mg/L,HRT为0.33 h时,纳米生态基对亚硝氮的处理能力最佳,去除率为71.5%。纳米生态基处理养殖污水的最佳条件:温度为30℃,DO为6.40 mg/L,HRT为0.33 h。

The orthogonal experiments with three factors （temperature, dissolved oxygen and hydraulic re- tention time） and four levels were designed to evaluate the efficiency of ammonia and nitrite treatment and deter- mine the optimum operating conditions of biofilters with nano-ecobase. The results indicated that it took 22 days to set up the biofilters by feeding aquaculture wastewater with high concentrations of ammonia and nitrite. The biofilters with nano-ecobase could remove ammonia and nitrite effectively. The mean ammonia and nitrite removal rates were 93.5% and 69.3% , respectively. The influencing degrees of the factors on ammonia and nitrite re- moval rate were HRT 〉 temperature 〉 DO and HRT 〉 DO 〉 temperature, respectively. The highest ammonia re- moval rate was 94.6% at 30℃ , DO concentration orS. 43 mg/L and HRT of 0.33 h. The highest nitrite removal rate was 71.5% at 21℃, DO concentration of 6.40 mg/L and HRT of 0.33 h. The optimum operating condi- tions of the nano-ecobase were 30℃ , DO concentration of 6.40 mg/L and HRT of 0.33 h.