泥炭作为缓释碳源对反硝化过程的影响

Effect of peat as a slow-release carbon source on denitrification process

采用柱实验,以泥炭颗粒作为缓释碳源,探究不同水力停留时间(HRT)下泥炭颗粒对反硝化过程的影响。结果表明:(1)泥炭颗粒可作为有效缓释碳源,当HRT为6.67h时,脱氮效果最好,硝酸盐氮去除率能达到81.9%。(2)出水COD较低,最终为9~12mg/L,不会对水体造成二次污染;亚硝酸盐氮先升后降,最终均小于0.2mg/L,未出现积累现象,泥炭颗粒可作为生物脱氮反应器中长期运行的缓释碳源。

Using peat particle as the slow-release carbon source,the column reactor experiment was conducted to investigate nitrate removal at different hydraulic retention times(HRT).The results showed that:(1)peat particles could be used as an effective slow-release carbon source.When HRT was 6.67 h,the denitrification effect was the best,and the removal rate of nitrate nitrogen could reach 81.9%.(2)The COD in effluent was low,which was 9-12 mg/L and didn’t cause secondary pollution to the water.Nitrite nitrogen first increased and then decreased,and finally all was less than 0.2 mg/L.There was no accumulation of nitrite during the experiment.Peat was suitable as a slow-release carbon source for long-term operation in biological nitrogen removal reactors.