CHEN De-fang,LI Mei,ZHANG Hua-jun,et al.Controlling Aluminum Content in Finished Water of Waterworks by Dosing Carbon Dioxide[J].China Water & Wastewater,2021,37(23 23):9-14.
Controlling Aluminum Content in Finished Water of Waterworks by Dosing Carbon Dioxide
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
23 23
Page:
9-14
Column:
Date of publication:
2021-12-01
- Keywords:
- pH; aluminum content; carbon dioxide; finished water of waterworks
- Abstract:
- The Huinan Waterworks and Hangtou Waterworks in Shanghai City use Qingcaosha Reservoir as the water source. Due to the seasonal algae growth, the increase in the pH value of the raw water leads to an increase in the aluminum content in the finished water of waterworks. In order to control residual aluminum content, the production test of adding carbon dioxide to adjust the pH value was carried out. The results showed that the effect of controlling aluminum was stable when the pH value of raw water was adjusted by carbon dioxide, with the aluminum content in finished water kept less than 0.1 mg/L. In the experiment, the utilization rate of carbon dioxide in the “gas/liquid” dosing device reached 94.3% with a carbon dioxide dosage of 9.02 mg/L, and PAC dosage was reduced by 13.1 mg/L; meanwhile, the utilization rate of carbon dioxide in the “liquid/liquid” dosing device was 92.9% with a carbon dioxide dosage of 8.47 mg/L, and PAC dosage was reduced by 17.9 mg/L. This method can effectively reduce the operating cost of waterworks which applies acidadded PAC to adjust the pH value of raw water to reduce aluminum content.
Last Update:
2021-12-01