盐度对污水硝化过程中N_2O产量的影响  

Effects of Salinity Concentration on N_2O Production During Nitrification

作　　者：尚会来[1] 彭永臻[1] 张静蓉[1] 叶柳[1] 赵凯峰[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京100124

出　　处：《环境科学》2009年第4期1079-1083,共5页Environmental Science

基　　金："十一五"国家科技支撑计划重点项目(2006BAC19B03);北京市教委"高层次人才资助计划"项目

摘　　要：采用调节盐度(7.5 g/L)和未调节盐度(0.1 g/L)实际生活污水驯化的活性污泥,分别考察了其相应硝化过程中N2O的产量和转化率.结果表明,盐度7.5 g/L生活污水硝化过程中N2O产量是未调节盐度N2O产量的2.85倍.考察其他盐度下污水硝化过程中N2O产量与转化率的结果表明,盐度从7.5 g/L降低到5.0、2.5 g/L后,N2O产量变化不大,但系统比氨氧化速率随着盐度的下降有所增加;当盐度从7.5 g/L急剧增加到10 g/L后,硝化过程中N2O产量和转化率均有大幅升高,产量达到7.5 g/L时的2.2倍,比氨氧化速率大幅下降.因此处理含盐污水时,应尽量避免盐度的过高波动,防止污水硝化过程中N2O产量和转化率大幅地升高.The experiment investigated the production and conversion rate of N2O during nitrification using saline sewage and municipal wastewater. Different kinds of sludge were used, domesticated by saline sewage influent （salinity 7.5 g/L） and municipal wastewater （salinity 0.1 g/L）, respectively. The results showed that the production of N2O using saline sewage was 2.85 times higher than that using municipal wastewater. The production and conversion rate of N2O during nitrification under different salinities were also investigated. The results showed that the production of N2O was almost the same when salinity decreased from 7.5 g/L to 5.0 g/L, even 2.5 g/L. However, specific ammonia oxidation rate was increased with the decrease of salinity. The sudden increase of salinity, from 7.5 g/L to 10 g/L, resulted in the increase of N2O production and conversion rate but decrease of specific ammonia oxidation rate. Consequently, It is important to avoid the severe fluctuation of salinity resulted in the increase of N2O production and conversion rate.

关 键 词：硝化 盐度 N2O 

分 类 号：X703.1[环境科学与工程—环境工程]