Evaluation of manganese removal efficiency in solution using filtration materials supplemented with NaClO
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Abstract
Manganese (Mn2+) contamination in domestic water in Vietnam exceeds permissible limits, posing negative impacts on public health. This study aims to evaluate the effectiveness of Mn²⁺ removal using filtration, combined with the oxidative support of NaClO. Experiments were conducted on a laboratory-scale filter column using synthetic Mn2+-contaminated water and three filter media: quartz sand, manganese sand, and zeolite. Investigated parameters included initial Mn2+ concentration (5 – 25 mg/L), NaClO concentration and volume (2 – 10 mg/L, 2 – 10 mL), reaction time (1 – 8 hours), at pH 7 ± 0.2 and temperature ~25°C. Mn2+ concentration was analyzed according to TCVN 6002:1995 using a colorimetric method with formaldoxime. Results showed that zeolite had the highest removal efficiency (97.7% without NaClO; 99.8% with NaClO) due to its catalytic formation of MnOx on the surface. Post-treatment Mn2+ concentrations were below 0.1 mg/L, meeting QCVN 01-1:2018/BYT standards. NaClO contributed to enhanced treatment efficiency, affirming its practical potential in domestic water treatment systems.
Tóm tắt
Ô nhiễm mangan (Mn2+) trong nước sinh hoạt tại Việt Nam đang vượt ngưỡng cho phép, ảnh hưởng tiêu cực đến sức khỏe cộng đồng. Nghiên cứu này được thực hiện nhằm đánh giá hiệu quả loại bỏ Mn2+ trong nước bằng phương pháp lọc, kết hợp với tác dụng hỗ trợ oxy hóa của NaClO. Thí nghiệm được thực hiện trên mô hình cột lọc quy mô phòng thí nghiệm với nước nhiễm Mn2+ nhân tạo và ba loại vật liệu lọc: cát thạch anh, cát mangan và zeolit. Các thông số khảo sát bao gồm: nồng độ Mn2+ đầu vào (5 – 25 mg/L), nồng độ và thể tích NaClO (2 – 10 mg/L, 2 – 10 mL), thời gian phản ứng (1 – 8 giờ), ở pH 7 ± 0,2 và nhiệt độ ~25°C. Nồng độ Mn2+ được phân tích theo TCVN 6002:1995 bằng phương pháp trắc quang sử dụng formaldoxim. Kết quả cho thấy zeolit hiệu quả cao nhất (97,7% không NaClO; 99,8% có NaClO) nhờ xúc tác tạo MnOx trên bề mặt. Mn²⁺ sau xử lý < 0,1 mg/L, đạt QCVN 01-1:2018/BYT. NaClO góp phần nâng hiệu suất xử lý, khẳng định tiềm năng ứng dụng trong hệ thống nước sinh hoạt.
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