FENGHong-bo,PANZeng-rui,SHENGJian-long,et al.Reuse of Waste Iron Shavings for Phosphorus Removal from Sewage[J].China Water & Wastewater,2022,38(7):86-89.
Reuse of Waste Iron Shavings for Phosphorus Removal from Sewage
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第7期
Page:
86-89
Column:
Date of publication:
2022-04-01
- Keywords:
- phosphorus removal; iron shaving; micro-electrolysis; sewage
- Abstract:
- Waste iron shavings were reused as fillers to remove phosphate in sewage to solve the problem of effluent TP exceeding the discharge standard in sewage treatment plants. When the hydraulic retention time (HRT) of the iron shaving filter system was 2.8 h, the TP removal rate was over 90% at the initial operation stage (20 days) and over 85% in 50 days of operation. The average removal efficiency of TP by iron shavings was 70 mg/(kg·d). Air-water washing could remove the surface sediments and maintain the phosphorus removal efficiency. Acid cleaning could remove almost all sediments on the surface of the fillers in long?term operation. The sediments were analyzed by XRD and XRF, and the TP removal mechanism by iron shavings was inferred as follows: FePO4 precipitation was generated through iron-carbon micro-electrolysis and oxidation, and FeOOH with large specific surface area was also generated to promote phosphorus adsorption, thus achieving efficient phosphorus removal.
Last Update:
2022-04-01