HUANGZheng-yu,WUXiao-long,LIAng-zhen,et al.Arsenic Removal by in Situ Formed Iron-manganese Binary Oxide in Pilot-scale Microflocculation-Filtration Process[J].China Water & Wastewater,2024,40(1):8-14.
Arsenic Removal by in Situ Formed Iron-manganese Binary Oxide in Pilot-scale Microflocculation-Filtration Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第1期
Page:
8-14
Column:
Date of publication:
2024-01-01
- Keywords:
- arsenic; groundwater; iron-manganese binary oxide; adsorption; filtration
- Abstract:
- A novel arsenic (As) removal technology was developed in response to the shortcomings of traditional adsorption-based methods, such as high adsorbent preparation costs, complex regeneration procedures, and difficult solid-liquid separation. This new approach utilized fiber balls and manganese sand as filling materials, and employed an iron-manganese binary oxide generated in situ by online dosing as the adsorbent. The arsenic contaminated groundwater in rural areas was selected as the target in this pilot scale test. The results showed that after five cycles of operation under optimal conditions of Fe3+ dosing at 1.75 mg/L, Mn7+ dosing at 0.1 mg/L, Mn2+ dosing at 0.15 mg/L, and hydraulic retention time of 15 minutes, the concentrations of As, Fe, and Mn in the effluent were stable below 10 μg/L, 0.3 mg/L and 0.1 mg/L, and were all below the limit values stipulated in the Standards for Drinking Water Quality (GB 5749-2022). Moreover, the operating cost of this technique was only about 0.91 yuan/m3. Compared with other techniques for removing arsenic from groundwater, it was more cost-effective.
Last Update:
2024-01-01