Dechlorination of Zanjan Lead and Zinc Industry’s Sewage using a Surface Flow Constructed Wetland

نوع مقاله : مقاله پژوهشی

نویسندگان

1 College of Environment, Karaj, Iran

2 عضو هیئت علمی دانشکئده محیط زیست کرج

چکیده

Environmental pollution is one of the concerns which affected human life and it is a must to find solutions for that. The effluent derived from the industrial units is contaminated with chloride. The amount of chloride in the effluent of studied lead and zinc industry is more than 50000 ppm and without an effective treatment system, will cause a lot of damage to the environment. Phytoremediation by Phragmites Australis plant has been used in a surface flow constructed wetland (CW) to reduce chloride concentration in the effluent. In the first pilot, the resistance of the plant to various chloride concentrations was measured. The sewage was tested with concentrations of 9250 and 4625 ppm. The results showed at these concentrations P.australis was able to reduce chloride concentration by 75.98% and by 92.33% respectively. In the second pilot, a CW on a laboratory scale was used to study the plant's behavior and chloride removal in a concentration of 2250 ppm. The plant performance was not satisfactory in this pilot and reduced the chloride concentration of the effluent by only 15.25%. These results indicate that P.australis has high efficiency in reducing chloride concentration and this yield is much higher in the summer season.

کلیدواژه‌ها


عنوان مقاله [English]

Dechlorination of Zanjan Lead and Zinc Industry’s Sewage using a Surface Flow Constructed Wetland

نویسندگان [English]

  • Raana Javidan 1
  • Ravanbakhsh Shirdam 2
  • Ahmad Nourigohar 1
1 College of Environment, Karaj, Iran
2 Assistant professor, College of Environment, Karaj, Iran
چکیده [English]

Environmental pollution is one of the concerns which affected human life and it is a must to find solutions for that. The effluent derived from the industrial units is contaminated with chloride. The amount of chloride in the effluent of studied lead and zinc industry is more than 50000 ppm and without an effective treatment system, will cause a lot of damage to the environment. Phytoremediation by Phragmites Australis plant has been used in a surface flow constructed wetland (CW) to reduce chloride concentration in the effluent. In the first pilot, the resistance of the plant to various chloride concentrations was measured. The sewage was tested with concentrations of 9250 and 4625 ppm. The results showed at these concentrations P.australis was able to reduce chloride concentration by 75.98% and by 92.33% respectively. In the second pilot, a CW on a laboratory scale was used to study the plant's behavior and chloride removal in a concentration of 2250 ppm. The plant performance was not satisfactory in this pilot and reduced the chloride concentration of the effluent by only 15.25%. These results indicate that P.australis has high efficiency in reducing chloride concentration and this yield is much higher in the summer season.

کلیدواژه‌ها [English]

  • Constructed Wetland
  • dechlorination
  • Phytoremediation
  • Phragmites australis
  • Wastewater Treatment