温度对颗粒污泥脱氮过程中N2O产生量的影响

采用好氧-缺氧SBR系统,考察了温度快速变化对亚硝化型颗粒污泥脱氮过程中N2O的释放量和脱氮效果的影响.结果表明,进水氨氮浓度相同的条件下,体系温度从31℃分别快速降至27℃和23℃,N2O产生量由0.706mg/L分别降至0.565mg/L和0.268mg/L,与此同时,氨氮去除率也从96.74%分别降至91.37%和70.73%.在3个温度条件下,颗粒污泥系统的好氧硝化阶段和缺氧反硝化阶段均有N2O产生,且大量N2O产生在好氧阶段.好氧阶段31℃N2O产生量是27℃N2O产生量的1.26倍,是23℃的2.97倍;缺氧阶段N2O的产生量在3个温度条件下差异不大,介于0.050~0.060mg/L之间.

Temperature effect on N2O production from nitrogen removal using granular sludge

Using an oxic-anoxic SBR system, with granular sludge, the nitrogen removal effect and N2O production were detected by changing the temperature during nitrogen removal via nitrite. The results showed that under the condition of the same influent ammonia concentration, the temperature of the system decreased from 31℃to 27℃ and 23℃, N2O production were 0.706mg/L, 0.565mg/L and 0.268mg/L, respectively; meanwhile the ammonia removal rate were 96.74%, 91.37% and 70.73%. N2O could be produced both oxic nitrification and anoxic denitrification using granular sludge system under different temperature conditions, and a large number of N2O produced in the oxic stage. N2O production under the temperature of 31℃ was 0.647mg/L, which was 1.26 times that of 27℃, and 2.97 times that of 23℃; while N2O production during anoxic denitrification phase with little difference between 0.050 and 0.060mg/L in the three temperature conditions.