曝气对生物促生剂修复城市黑臭河道水体的影响

Effects of aeration to remediation of black-odorous urban river by using biostimulants

在实验室条件下研究了曝气对生物促生剂修复城市黑臭河道水体效果的影响,并通过控制曝气时间及强度考察处理效果以确定曝气方式和曝气量。结果表明:在生物促生剂修复城市河道黑臭水体过程中使用曝气协同作用可大大增强生物促生剂的修复作用,加快修复速度。使用间歇曝气协同生物促生剂作用时效果与连续曝气相近,且可以降低运行成本。实验60 d后,上覆水COD、NH3-N和TP去除率分别达46.8%、98.7%和73.3%,上覆水pH由7.61提高至7.92;底泥削减达5.49 cm,底泥有机质削减率达10.5%。

Aeration was used during the remediation of black-odorous water in urban rivers by biostimula- nts. Effects were compared by controlling the aeration time and aeration rate to choose the best aeration mode and the most appropriate aeration amount. Results show that the remediation effects and speed of the black-odorous urban rivers by biostimulants can be improved by using aeration. The effects of intermitent aeration are close to continuous aeration and the running cost can be reduced. After 60 days of experiment, the removal rates of COD, NH3-N and TP were 46.8% , 98.7% and 73.3% , respectively; the pH of overlying water changed from 7.61 to 7.92 ; the reduction of sediment was 5.49 cm; and the removal rate of organic matters was 10.5%.