HUXiaofang,CHENMiaolan,HUANGJianzhang,et al.Manganese Removal by Sodium Hypochlorite Combined with Powdered Activated Carbon[J].China Water & Wastewater,2026,42(9):40-46.
次氯酸钠与粉末活性炭联用除锰
- Title:
- Manganese Removal by Sodium Hypochlorite Combined with Powdered Activated Carbon
- Keywords:
- sodium hypochlorite; powdered activated carbon; manganese; ammonia; disinfection by-product
- 摘要:
- 在常规pH条件下，联投次氯酸钠和粉末活性炭，将地表水中溶解态锰氧化成颗粒态二氧化锰，再协同混凝沉淀和过滤工艺除锰。结果表明，联投次氯酸钠和粉末活性炭除锰效果良好，在设计的试验条件下，锰去除率与次氯酸钠投加量和粉末活性炭投加量均呈现明显的正相关关系。在絮凝快结束时联投粉末活性炭和次氯酸钠，与在原水处联投相比，水中的溶解态锰去除率明显更高（99%以上），但沉后水中颗粒态锰浓度也明显更高。沉后水中的颗粒态锰可以通过后续砂滤工艺被有效去除。相同次氯酸钠和粉末活性炭投加量条件下，原水中的氨浓度越高，除锰效果越差，但次氯酸钠投加量足够时，除锰效果依然良好。三种不同的试验原水采用粉末活性炭与次氯酸钠联用除锰，再经后续常规工艺处理，其消毒副产物浓度均远低于国标限值，无超标风险。
- 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.
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