XIEFeng-ying,LIShuang,ZHANGXue-jiao,et al.Semi-closed Air-water Backwashing Contact Flocculation Filtration for Treatment of Rural Drinking Water[J].China Water & Wastewater,2023,39(3):40-46.
Semi-closed Air-water Backwashing Contact Flocculation Filtration for Treatment of Rural Drinking Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第3期
Page:
40-46
Column:
Date of publication:
2023-02-01
- Keywords:
- rural drinking water; semi-closed filtration; air-water backwashing; contact flocculation; water conservation
- Abstract:
- Due to the high altitude and long distance in some remote mountainous areas in south China, it is difficult to extend the urban water supply network in place, while the single village water supply station mainly has the problems such as difficulty in stably meeting the turbidity standard and high self-use water consumption rate. Therefore, a semi-closed air-water backwashing contact flocculation filtration technology was developed and applied to rural drinking water treatment.The filtration and water-saving performances were investigated, and a demonstration project was carried out in Zhouyi Village, Zhoushan Town, Yongkang City, Zhejiang Province. The experimental results showed that the average turbidity of the effluent was below 0.2 NTU after filtration for 28 h when the raw water turbidity was 20 NTU, the PAC dosage was 1.5 mg/L, the filtration rate was 8 m/h, and the water temperature was 25 ℃. When the aeration rate and backwash flow rate of air-water backwashing system were 17 L/(m2·s) and 4 L/(m2·s), respectively, the self-use water consumption rate was 0.96%, and 67.2% of the water consumption was saved compared with that of single water backwashing.The actual application results showed that the average effluent turbidity was less than 0.5 NTU, the maximum allowable liquid level of the filter was 4-5 m, and the self?use water consumption rate was 1.37%.
Last Update:
2023-02-01