TAOHui,LIYan-hui,ZHOUWei-qing,et al.Research on the Replacement of Biological Activated Carbon for Low Organic Matter Removal Rate during Low Temperature Period[J].China Water & Wastewater,2022,38(9):33-38.
Research on the Replacement of Biological Activated Carbon for Low Organic Matter Removal Rate during Low Temperature Period
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第9期
Page:
33-38
Column:
Date of publication:
2022-05-01
- Keywords:
- drinking water treatment; low temperature period; biological activated carbon; method of replacing activated carbon; organic matter
- Abstract:
- The biological activated carbon (BAC) of a water treatment plant in Jiangsu Province has been put into operation for 6 years, and the effluent quality can stably meet the requirements of the Standards for Drinking Water Quality (GB 5749-2006). However, according to the requirements of the newly implemented The Control Standards of the Key Water Quality Parameters for Urban Water Treatment Plants in Jiangsu Province (DB 32/T 3701-2019), in the low temperature period of the third year of BAC being put into use, CODMn can not reach the standard stably, that is, the life of biological activated carbon is less than 3 years. The analysis showed that it was mainly due to the poor microbial activity of BAC at low temperature period and the insufficient adsorption capacity of BAC with a long running life. In order to ensure the effluent quality, it is urgent to replace the BAC. The study on the replacement method of BAC showed that the higher the proportion of new BAC filling, the better the removal effect of organic matter. However, the replacement cost was high and the adsorption capacity of the original BAC was wasted. Pilot study showed that the carbon replacement method with 20% new BAC could ensure the CODMn of the effluent at low temperature period to meet the requirements of DB 32/T 3701-2019, which required CODMn was not higher than 2.2 mg/L using the lake and reservoir as water source. Therefore, it is recommended that the water treatment plant replace the BAC before the low temperature period (mid?October) every year, and the replacement ratio is 20%. Compared with the one?time replacement, the replacement cost can be reduced by 20%-40%.
Last Update:
2022-05-01