The filtering efficiency of iron and salt of city rainwater by sand filtration process

3rd International Conference on Energy Engineering and Environmental Protection

能源学;生态环境科学

Liu, Huipu^1 ; Wu, Leixiang^1 ; Wu, Chunfang^2 ; Liu, Laisheng^1 ; Wu, Jiapeng^1

China Institute of Water Resources and Hydropower Research, Beijing

100038, China^1

Second Institute of Oceanography, Soa, Hangzhou

310012, China^2

关键词: Filter capacity;    Filtering efficiency;    Filtering materials;    Filtering solutions;    Residential areas;    Salt solution;    Sand filter;    Sand filtration;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/227/5/052067/pdf
DOI  :  10.1088/1755-1315/227/5/052067

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The aim about the study was to improve the filtering efficiency of sand filter in the treatment of urban rainwater in residential area. In the experiment, a better sand filter was designed through changing the filtering materials and measuring the filtering efficiency for the urban rainwater treatment. Because of the weather conditions, not enough rainwater could be collected so that the stimulated rainwater which contained the same concentration of measured pollutants was used in the process of sand filtration. The experiment was divided into two parts, one part was the efficiency of salt removal and another was the efficiency of iron removal. In the salt removal testing, four sand filters were filled with different filtering materials which included 40 cm sand, 30 cm sand with 10 cm activated carbon, 30 cm sand with 10 cm zeolite, and 30 cm sand with 10 cm limestone, through pumping into a certain concentration of salt solutions and then getting the filtering efficiency of the sand filter. The second part of experiment was about iron testing. The iron testing included no salt iron testing which set three different concentration of iron (3 mg/L, 6 mg/L, 9 mg/L) and iron mixed with salt testing. (3 mg/L iron with 200 mg/L concentration or 400 mg/L concentration of salt, 9 mg/L of iron with 200 mg/L concentration or 400 mg/L concentration of salt). Then pumping into four sand filters filled with the same material like salt removal testing and get the efficiency of sand filter. The best filtering material and sand filter improvement would be determined through the two parts of the experiment and compared the filtering efficiency. Through the testing, the filtering material was strength the filter capacity. Otherwise, the zeolite had the best filtering efficiency in the salt testing and the following was limestone, activated carbon and sand. The iron testing was failed because the long stored of the filtering solutions.