碳源强化对人工湿地反硝化过程的影响研究

反硝化是人工湿地去除硝酸盐氮的主要机制,高含氮污水中低碳氮比是导致脱氮效果低的主要原因.研究了添加碳源对人工湿地反硝化过程的强化效果,结果表明,外界温度对湿地内的反硝化影响不大,而碳源则是重要的影响因素,对湿地投加碳源可以显著提高湿地的硝氮去除能力,在进水硝氮浓度25～45mg.L-1,24h水力停留时间的条件下,投加...

Study on the influence of enhanced carbon resource on denitrification in the constructed wetland

Denitrification is the most important mechanism for nitrate removal in constructed wetlands. The results of this study showed that the external carbon source can remarkably improve the nitrate remove ability of the constructed wetlands, while the temperature produces few effects on the nitrate removal. It showed that the nitrate remove rate can increase from 30% to more than 60% in the summer and from 5% to 35% in the winter, when the nitrate load was 25~45mg/L, the retention time was 24 hours and 30~50mg/L DOC was ploughed into the constructed wetland. However, there was a little accumulation of nitrite in the constructed wetlands when the external carbon source was supplied. The maximum removal of nitrate by constructed wetlands was more than 5g/(m2d) by means of enhanced denitrification.