HUXiaofang,CHENMiaolan,HUANGJianzhang,et al.Manganese Removal by Sodium Hypochlorite Combined with Powdered Activated Carbon[J].China Water & Wastewater,2026,42(9):40-46.
Manganese Removal by Sodium Hypochlorite Combined with Powdered Activated Carbon
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第9期
Page:
40-46
Column:
Date of publication:
2026-05-01
- Keywords:
- sodium hypochlorite; powdered activated carbon; manganese; ammonia; disinfection by-product
- Abstract:
- Under normal pH conditions, the combination of sodium hypochlorite and powdered activated carbon was used to oxidize dissolved manganese in surface water into particulate manganese dioxide, followed by coagulation, sedimentation, and filtration processes to remove manganese. The results showed that the combined use of sodium hypochlorite and powdered activated carbon achieved good manganese removal. Under the designed experimental conditions, the removal rate of manganese exhibited a significant positive correlation with the dosages of both sodium hypochlorite and powdered activated carbon. When sodium hypochlorite and powdered activated carbon were added together towards the end of the flocculation stage, the removal rate of dissolved manganese in water was significantly higher (above 99%) compared to their addition together in raw water; however, the concentration of particulate manganese in post-sedimentation water was significantly higher. This particulate manganese in post-sedimentation water could be effectively removed by subsequent sand filtration. Under the same dosages of sodium hypochlorite and powdered activated carbon, higher ammonia concentrations in raw water led to poorer manganese removal, but when the sodium hypochlorite dosage was sufficient, the manganese removal effect remained good. Three different types of raw water were treated with powdered activated carbon combined with sodium hypochlorite for manganese removal, followed by subsequent conventional treatment processes. The concentrations of disinfection by-products in the treated water were far below the national standard limits, with no risk of exceeding the standards.
Last Update:
2026-05-01