A/O MBBR工艺处理垃圾焚烧渗沥液厌氧出水过程中N2O释放的影响因素

采用A/O MBBR工艺对垃圾焚烧渗沥液经厌氧生物处理后的出水进行脱氮处理，考察进水COD/N、pH、温度和回流比对脱氮系统中N2O释放量的影响。结果表明，A/O MBBR系统中N2O的释放量受进水COD/N、pH和回流比的影响较大，受温度的影响较小。降低进水COD/N、pH从8.5升高到9.5或降低到7.5、回流比从300% 升高到400%，系统中N2O的释放量均会升高。当进水COD/N为4.2，进水pH为8.5，温度为32 ℃，回流比为300% 时，A/O MBBR系统中总N2O的释放量最低，为2.03 mg·L-1，NH4+-N转化率和TN去除率分别为99.3%和80.6%。

Factors on nitrous oxide emission during treatment of anaerobic effluent of fresh leachate from MSW incineration plant by A/O MBBR

An anoxic/aerobic moving bed biofilm reactor (A/O MBBR) was used to treat the leachate from a municipal solid waste (MSW) incineration plant after being treated by an anaerobic biological process. The effects of COD/N, pH, temperature and reflux ratio on N2O emission were investigated in this study. The results showed that COD/N, pH and reflux ratio has been demonstrated to have a significant influence on N2O emission in A/O MBBR system, while the temperature had no apparent influence. N2O emission amount increased with decreasing the COD/N and with increasing the reflux ratio (from 300% to 400%), and the lower N2O emission amount was detected in the system with a pH of 8.5. The minimum N2O of 2.03 mg·L-1 was emitted under the optimal condition with the COD/N at 4.2, pH at 8.5, temperature at 32℃ and reflux ratio at 300%. 99.3% of NH4+-N and 80.6% of TN can be removed by the A/O MBBR system under this optimal condition.