QIUFu-guo,XIAXin,LIUYu-jun,et al.Activated Carbon for Modification of Bioretention System Substrate to Enhance Nitrogen Removal[J].China Water & Wastewater,2023,39(17):124-130.
Activated Carbon for Modification of Bioretention System Substrate to Enhance Nitrogen Removal
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
124-130
Column:
Date of publication:
2023-09-01
- Keywords:
- bioretention system; modified activated carbon; enhanced nitrogen removal; internal submerged saturation zone; antecedent drying time
- Abstract:
- This paper used activated carbon to modify the packing media of bioretention system and enhance its nitrogen removal performance to solve the problem of nitrogen leaching from the traditional rainwater bioretention system. Firstly, ZnCl2 solution and hydrochloric acid leaching solution of sludge from water treatment plant were employed to modify granular activated carbon to improve its nitrate nitrogen adsorption capacity. Then, the modified activated carbon (20% by weight) and sludge from water treatment plant (12% by weight) were mixed into the sand media of the bioretention system to investigate the removal performance of nitrogen and phosphorus. The performance of the modified system for nitrogen and phosphorus removal were evaluated by the retention column experiment under the condition of no internal submerged saturation zone and long antecedent drying time. When there was no internal submerged saturation zone in the modified system, the removal rates of NO3--N, TN and TP reached 90.98%, 72.65% and 95.85%, respectively. Under the long antecedent drying time, the modified bioretention system effectively reduced nitrogen leaching, the removal rate of TN reached 44.28%, and the removal rate of TP was above 97%.
Last Update:
2023-09-01