改性沸石过滤法处理屋面雨水径流技术与装置研究
Research on the technology and device for treating roof rainwater runoff by modified zeolite filtration method
为针对性解决如何快速削减屋面雨水径流污染负荷的问题,结合前期理论成果,研究采用改性沸石过滤的方法处理屋面雨水径流。研究天然沸石的吸附性能和氯化钠改性沸石对屋面雨水污染物吸附的效果,设计并使用过滤罐装置验证实际效果。批次实验结果表明,沸石滤料粒径的大小与吸附效果具有相关性,即粒径越小,其吸附能力越好,在本实验条件下建议吸附时间为120 min。通过拟合动力学模型,相较于准一级动力学模型,准二级动力学模型的R2值区间范围更趋近于1,能够更准确地反映沸石对氨氮的吸附过程,此过程受化学吸附机理控制。采用高度为3 m的玻璃吸附柱,开展氯化钠改性沸石处理屋面雨水的实验,结果表明,屋面雨水径流通过吸附柱流速越小、滤料填充高度越大、沸石粒径越小,吸附效果越好。设计并使用改性沸石过滤罐装置处理屋面雨水径流,验证改性沸石处理屋面雨水试验结果,出水符合排放标准。
In order to reduce the pollution load of roof rainwater runoff rapidly, the modified zeolite filtration method is adopted to treat the roof rain-runoff, based on previous theoretical studies. The adsorption performance of natural zeolite and the effect of sodium chloride-modified zeolite on the adsorption of roof stormwater pollutants were investigated, and the filter tank device was designed and used to verify the actual effect. The results of the batch experiments showed that the particle size of zeolite filter media correlated with the adsorption effect, i.e., the smaller the particle size, the better the adsorption capacity, and the recommended adsorption time was 120 min under the present experimental conditions. By fitting a kinetic model, the quasi-secondary kinetic model, compared with the quasi-primary kinetic model, showed that the interval range of the R2 value of the quasi-secondary kinetic model was closer to 1, which could more accurately reflect the process of zeolite's adsorption of ammonia nitrogen, which is controlled by the chemical adsorption mechanism. A glass adsorption column with a height of 3 m was used to test the treatment of roof rainwater with sodium chloride-modified zeolite. The results showed that the smaller the flow rate of roof rainwater runoff through the adsorption column, the larger the filling height of the filter material, and the smaller the zeolite particle size, the better the adsorption effect. The modified zeolite filter tank device was designed and used to treat roof rainwater runoff, and the effect of the modified zeolite treatment of roof rainwater was verified by the test results, and the effluent complied with the discharge standards.
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国家水体污染控制与治理科技重大专项项目(2017ZX07103-001)
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