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| Application of a recycled standing combined constructed wetland system for the treatment of heavy metals from mixed wastewater in a rural area |
| Received:April 05, 2018 |
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| KeyWord:recycled standing combined constructed wetlands;heavy metals;mixed wastewater;influence factors |
| Author Name | Affiliation | E-mail | | FENG Xu | Department of Ecology, Jinan University, Guangzhou 510632, China | | | YANG Yang | Department of Ecology, Jinan University, Guangzhou 510632, China
Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering, Ministry of Education, Jinan University, Guangzhou 510632, China | yangyang@scies.org | | ZHENG Zhe | Department of Ecology, Jinan University, Guangzhou 510632, China | | | TANG Xiao-yan | Department of Ecology, Jinan University, Guangzhou 510632, China | | | ZHANG Xiao-meng | Department of Ecology, Jinan University, Guangzhou 510632, China | | | DAI Yu-nü | Department of Ecology, Jinan University, Guangzhou 510632, China | | | XIONG Chun-hui | Department of Ecology, Jinan University, Guangzhou 510632, China | |
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| Abstract: |
| With the aim to solve problems caused by disordered drainage of heavy metals from mixed wastewater and the difficulty of centralized treatment in rural areas, a new type of recycled standing combined constructed wetland system (RSCCWS) with the advantages of a small footprint, simple operation, and easy maintenance was used in this study to treat heavy metals wastewater. The objectives of this research were to study the treatment of a RSCCWS for mixed wastewater containing heavy metals and general water pollutants and the effect of different operating conditions on the RSCCWS performance. The results showed that average removal efficiencies of CODCr, TN, TP, and TSS were 82.83%, 27.67%, 64.64%, and 92.58%, respectively, under the operation conditions of a 6-hour run time and 30-minute circulation time. Simultaneously, the average removal efficiencies of As, Cd, Pb, Cu, and Zn were 50.01%, 62.43%, 91.02%, 63.37%, and 51.92%, respectively. Moreover, the removal loads of heavy metals were up to 2.4, 12.1, 160.9, 1 214.9, and 1 989.0 mg·m-2·d-1, respectively, which were 4 to 27 times greater compared with those of other research. The changes in pH, CODCr, and circulation time had no significant effect on the removal efficiency of heavy metals (P>0.05). When the run time was extended to 24 hours, increased removal rates of four kinds of heavy metals, except Zn, were observed compared with those of the 6-hour run time. With the advantages of high and quick removal of heavy metals, the RSCCWS has great potential in treating heavy metals from mixed wastewater in rural areas. |
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