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| Influencing Factors on Heavy Metals Removal by Electrocoagulation Treatment |
| Received:February 10, 2014 Revised:March 17, 2014 |
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| DOI：10.7643/issn.1672-9242.2014.03.016 |
| KeyWord:electrocoagulation heavy metals wastewater iron electrode |
| Author | Institution |
| XIONG Dao-wen |
Zhongnan Engineering Corporation,Changsha , China;Water Treatment Engineering Research Center of Hunan,Changsha , China |
| XIONG Shan |
Zhongnan Engineering Corporation,Changsha , China;Water Treatment Engineering Research Center of Hunan,Changsha , China |
| CHEN Xiang-bin |
Zhongnan Engineering Corporation,Changsha , China;Water Treatment Engineering Research Center of Hunan,Changsha , China |
| YU Shao-qin |
Zhongnan Engineering Corporation,Changsha , China;Water Treatment Engineering Research Center of Hunan,Changsha , China |
| WANG He-de |
Zhongnan Engineering Corporation,Changsha , China;Water Treatment Engineering Research Center of Hunan,Changsha , China |
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| Abstract: |
| Objective To study the influencing factors on heavy metals removal by electrocoagulation treatment. Methods Wastewater was treated with electrocoagulation by using iron plate as electrode. Several affecting factors, such as retention time, initial pH, current density, conductivity and initial concentration were investigated. Results The removal rate was obviously improved with the increase of retention time, initial pH and current density, however, the improvement of treatment effect did not continue after reaching a certain level. Conductivity did not influence the treatment effect, but low conductivity increased energy consumption. To achieve the desired treatment effect, the higher the initial concentration of wastewater , the higher the consumption of energy and plates. Conclusion Electrocoagulation was more suitable for advanced treatment of wastewater containing heavy metals. The removal rates of total copper, total nickel, total lead, total zinc, total cadmium and total chromium were above 99% under the conditions of initial pH of 8. 5 ~ 9. 0, conductivity of 1500 ~ 2000 μs / cm, retention time of 3 ~ 4 min, current density of 13. 2 ~ 19. 8 A / m2and initial concentration of 0 ~ 20 mg / L. |
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