QULi-min,GAO Yan-bo.Enhanced Removal for Nitrogen and Phosphorus by Using Sulfur and Zero?valent Iron in Submerged Constructed Wetland[J].China Water & Wastewater,2023,39(14):102-108.
Enhanced Removal for Nitrogen and Phosphorus by Using Sulfur and Zero?valent Iron in Submerged Constructed Wetland
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第14期
Page:
102-108
Column:
Date of publication:
2023-07-17
- Keywords:
- wastewater treatment plant effluent; submerged constructed wetland; sulfur/zero?valent iron; nitrogen and phosphorus removal; nitrous oxide
- Abstract:
- The contents of nitrogen and phosphorus in wastewater treatment plant (WWTP) effluent were higher than the standard of Environmental Quality Standards for Surface Water（GB 3838-2002）, and it is essential to decrease their concentrations before discharging into the receiving water body. In this study, four submerged constructed wetlands were installed to investigate the influence of the addition of sulfur, zero-valent iron, sulfur and zero-valent iron on the removal for nitrogen and phosphorus. Ten months continuous operation results showed the sulfur could enhance the denitrification significantly（the average removal rate of total nitrogen was over 80%） while the sulfate in effluent was more than 250 mg/L. Phosphorus in effluent could decreased to below 0.1 mg/L with the usage of zero-valent iron, but its enhanced nitrogen removal was not obvious. It is observed that the combination of sulfur and zero-valent iron in wetland could enhance the removal ability for nitrogen and phosphorus, meanwhile sulfate and total ferrous in effluent were in low concentrations, and a low emission of nitrous oxide was obtained as well. Therefore, it is showed that the combination usage of sulfur and zero-valent iron is suitable for advanced purification of WWTP effluent.
Last Update:
2023-07-17