ZHENGXin-yi,WUXin-yi,LIWei,et al.Efficiency and Mechanism of Manganese Removal from Water Using Chlorine Coupled with Powdered Activated Carbon[J].China Water & Wastewater,2024,40(23):1-6.
Efficiency and Mechanism of Manganese Removal from Water Using Chlorine Coupled with Powdered Activated Carbon
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第23期
Page:
1-6
Column:
Date of publication:
2024-12-01
- Abstract:
- Chlorine coupled with powdered activated carbon (Cl2/PAC) was employed to remove manganese from water. This study investigated the efficiency and mechanism of manganese removal, as well as the impact of common inorganic ions and natural organic matter (NOM) found in groundwater on manganese removal efficiency. Experimental results showed that under a solution pH of 7, 1 mg/L chlorine coupled with 10 mg/L wood-based PAC could reduce 1 mg/L Mn(Ⅱ) to below the standard limit of 0.1 mg/L within 30 minutes. In the Cl2/PAC system, MnO2 was initially generated on the PAC surface, which further catalyzed the oxidation of Mn(Ⅱ) to form new manganese oxide, thereby achieving efficient removal of Mn(Ⅱ). Inorganic ions such as Ca2+, Mg2+, SO42-, SiO32- and PO43- had little impact on the Mn(Ⅱ) removal efficiency of Cl2/PAC, but Fe2+, NH4+ and NOM significantly inhibited the Mn(Ⅱ) removal. Competition with free chlorine was identified as the main reason for the reduced Mn(Ⅱ) removal efficiency. Based on these findings, a method was proposed to increase the effective chlorine concentration to 1 mg/L and compensate for the chlorine demand from ions or NOM in raw water to eliminate matrix effects. This method successfully reduced Mn(Ⅱ) concentration to below 0.1 mg/L in groundwater samples with different matrices within 30 minutes.
Last Update:
2024-12-01