ZHANGGuo-zhen,ZHAOKai,WUFu-ping,et al.Effect of Hexavalent Chromium Ions on Biological Slow Filtration Technology for Treating Micro-polluted Raw Water[J].China Water & Wastewater,2023,39(13):60-65.
Effect of Hexavalent Chromium Ions on Biological Slow Filtration Technology for Treating Micro-polluted Raw Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第13期
Page:
60-65
Column:
Date of publication:
2023-07-01
- Abstract:
- The biological slow filtration column filled with different filter media (activated carbon, zeolite and quartz sand) was used to treat micro-polluted raw water, and the influence of hexvalent chromium ion with initial concentration of 0.15 mg/L on the pollutants removal efficiency was investigated. Hexavalent chromium ion was toxic to microorganisms in the biological slow filtration column, which led to the trend of first decreasing and then increasing in the removal rates of CODMn and ammonia nitrogen by the three kinds of biological slow filtration column and the removal rate of hexavalent chromium ion by zeolite and quartz sand filter columns. Due to the huge specific surface area of activated carbon, the removal rate of hexavalent chromium ion by the activated carbon filtration column always stabilized at a high level. The removal rates of CODMn, ammonia nitrogen and hexvalent chromium ion by different biological slow filtration columns in descending order were as follows: activated carbon filter column, zeolite filter column and quartz sand filter column, which was due to the differences in specific surface area of the three filter materials and the trace elements contained that could promoted. microorganisms growth. In the activated carbon filtration column, the pollutants concentration decreased along the layer, the pollutants removal rate within the first 20 cm changed the most, and the pollutants concentration in effluent met the Standards for Drinking Water Quality (GB 5749-2006).
Last Update:
2023-07-01