Iron and manganese removal by using manganese ore constructed wetlands in the reclamation of steel wastewater

被引:53
|
作者
Xu, Jing-Cheng [1 ]
Chen, Gu [1 ]
Huang, Xiang-Feng [1 ]
Li, Guang-Ming [1 ]
Liu, Jia [1 ]
Yang, Na [2 ]
Gao, Sai-Nan [2 ]
机构
[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 20092, Peoples R China
[2] NW A&F Univ, Coll Resource & Environm, Yangling 712100, Shanxi, Peoples R China
关键词
Manganese ore; Constructed wetland; Steel wastewater; Wastewater reclamation; FILTER MEDIA; PHOSPHORUS REMOVAL; SYSTEM; BIOFILTRATION; FILTRATION; PLANTS; REUSE; FE;
D O I
10.1016/j.jhazmat.2009.03.074
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
To reclaim treated steel wastewater as cooling water, manganese ore constructed wetland was proposed in this study for the removal of iron and manganese. In lab-scale wetlands, the performance of manganese ore wetland was found to be more stable and excellent than that of conventional gravel constructed wetland. The iron and manganese concentration in the former was below 0.05 mg/L at hydraulic retention time of 2-5 days when their influent concentrations were in the range of 0.16-2.24 mg/L and 0.11-2.23 mg/L, respectively. Moreover, its removals for COD, turbidity, ammonia nitrogen and total phosphorus were 55%, 90%, 67% and 93%, respectively, superior to the corresponding removals in the gravel wetland (31%, 86%, 58% and 78%, respectively). The good performance of manganese ore was ascribed to the enhanced biological manganese removal with the aid of manganese oxide surface and the smaller size of the medium. The presence of biological manganese oxidation was proven by the facts of good manganese removal in wetlands at chemical unfavorable conditions (such as ORP and pH) and the isolation of manganese oxidizing strains from the wetlands. Similar iron and manganese removal was later observed in a pilot-scale gravel-manganese-ore constructed wetland, even though the manganese ore portion in total volume was reduced from 100% (in the lab-scale) to only 4% (in the pilot-scale) for the sake of cost-saving. The quality of the polished wastewater not only satisfied the requirement for cooling water but also suitable as make-up water for other purposes. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:309 / 317
页数:9
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