不同温度条件下生态减污袋去除模拟污水中氨氮及磷的效果研究

Effects of eco-abatement bags on removing ammoniac nitrogen and phosphorus ingredients from the simulated sewage at different temperatures

研究在低温和常温条件下不同比例砂土与黏土混合制成的生态减污袋对模拟污水中氨氮及磷的去除效果。试验模拟污水中氨氮及磷的质量浓度分别为10 mg/L和1 mg/L,生态减污袋中砂土和黏土的质量比分别为1∶1、5∶1和10∶1,温度控制在22℃和4℃。结果表明,低温条件下砂土与黏土比例为1∶1的减污袋对模拟污水中氨氮和磷的去除率分别达到67%和38%;而砂土与黏土比例为10∶1的减污袋对低温条件下模拟污水中氨氮和磷的去除率均最低,分别为32%和28%,其对常温条件下污水中氨氮和磷的去除率也分别只有48%和52%。对比常温条件下的试验,低温条件下生态减污袋的去除效果明显偏低。由于黏土颗粒具有较大的比表面积和较好的离子交换能力,因此应选择黏土含量较高的生态减污袋,以在低温条件下保持良好的去氮除磷效果。

The paper intends to present our study results on the effect of eco-abatement bags on removing ammoniac nitrogen and phosphorus ingredients from the simulated sewage at different temperatures.As is known,it is possible to remove the ammoniac nitrogen and phosphorus components in water bodies through physical adsorption at low temperatures.In this paper,we have made an investigation of the effect of the ecological abatement bags made of sand and clay in different ratios to remove the ammoniac nitrogen and phosphorus from the simulated sewage at low and/or normal temperatures.The concentrations of the ammoniac nitrogen and phosphorus were simulated at about 10 mg/L and 1 mg/L,respectively.Then,we chose three mass ratios of sand to clay in the eco bags,such as 1：1,5：1 and 10：1,with experimental temperatures kept at 22 ℃and 4 ℃.The static experiment we have developed was arranged to last 7 to 9 days with water samples collected daily with predetermined ingredients of ammoniac nitrogen and phosphorus.Results of our experiments show that the removal rates of ammoniac nitrogen and phosphorus in the simulated sewage can be made as high as about 67% and 38%,respectively, at low temperatures,and 76% and 65%,respectively,at normal temperatures,by using the abatement bags with sand and clay ratio of 1：1;but the corresponding removal rates of the bags with sand and clay ratio of 10：1 were the lowest in the same sewage,32% and 28%,at low temperatures,and 48% and 52%,at normal temperatures.Compared with the experimental results at normal temperatures,the removal rates of the bag were significantly lower at low temperatures.Because of higher specific surface area and ion exchange capacity of clay,the bags with higher proportional clay content are likely to be chosen to achieve a better removal effect at low temperatures.