ZHEN Xiang-hua,LI Lu,WAN Nian-hong,et al.Discussion on Design Parameters of Carbon-Sand Filter in Waterworks[J].China Water & Wastewater,2020,36(16 16):81-85.
Discussion on Design Parameters of Carbon-Sand Filter in Waterworks
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
16 16
Page:
81-85
Column:
Date of publication:
2020-08-17
- Abstract:
- At present, the application of carbon-sand filter in waterworks is not widely used, and its design is often carried out by each design institute according to their own experience. On the basis of referring and summarizing the achievements of water special projects and the application cases and design experience of large-scale water supply plant in China, the design parameters and design points of carbon-sand filter were put forward. The carbon-sand filter is suitable for the reconstruction or new construction of water plants with limited land occupation or limited funds and organic micro pollutants exist in the influent. Its inflow water quality control index turbidity should be less than 1 NTU. When it is used for reconstruction projects, the sand layer thickness of 0.4-0.5 m and the carbon layer thickness of 0.8-1.0 m can be used. When it is used for new construction projects, the sand layer thickness of 0.6-0.7 m and the carbon layer thickness of 1.0-2.0 m can be used, the fine sand filter material with d10=0.55 mm should be selected for quartz sand, 8 × 30 mesh coal crushed carbon and 1.5 mm coal columnar carbon should be selected for active carbon. The normal filtration rate and contact time of empty bed are respectively 6-9 m/h and 6-20 min. The daily washing and regular washing methods are recommended. Daily washing cycle control is within 1 d, regular washing cycle control is within 3-5 d. In addition, it is suggested that the evaluation index of activated carbon failure should be mainly based on whether the removal effect of pollutants could reach the target value, not on the iodine adsorption value and methylene blue adsorption value of activated carbon.
Last Update:
2020-08-17