无机碳源对煤气化废水厌氧段处理效能影响

Effect of Inorganic Carbon on Anaerobic Treatment of Coal Gasification Wastewater

在温度35℃,pH值7.0左右,HRT为30 h,进水稀释配比R为75%,NO_(2-)-N/NH_(4+)-N为1.6条件下,研究厌氧反应器厌氧氨氧化与反硝化的耦合作用。厌氧反应器中NH_(4+)-N、NO_(2-)-N浓度分别为(75±2)mg/L、(120±2)mg/L,COD为(900±5)mg/L,总氮负荷为(216±5)mg/(L·d),考察不同无机碳源浓度对厌氧段总氮与有机物去除效果的影响。实验结果表明,在无机碳源浓度为12 mmol/L时,厌氧段氨氮、亚硝态氮去除率分别为57.26%、83.07%,TN去除率最高为74.15%,COD去除率为78.12%。随着无机碳源的浓度继续增加到24 mmol/L时,氨氮去除效果显著下降,去除率仅为28.92%。结果表明,适当增加系统无机碳源浓度,可以强化厌氧氨氧化与反硝化的协同作用,提高系统的脱氮性能,而高浓度的无机碳会对系统中菌群产生明显抑制作用。

The synactic effect of anammox coupling with heterotrophic denitrification process was investigated in an anaerobic reactor with an influent at the temperature of 35℃,pH of 7. 0,hydraulic detention time of 30 h.,influent ratio at 75% and NO2--N/NH4＋-N at 1.6.the effects different inorganic carbon source concentration on total nitrogen and organic matter removal were investigated in detail under the condition of the concentration of NH4＋-N、NO2--N、COD at 75±2mg/L、120±2mg/L、900±5mg/L respectively and TN load of 216±5 mg/（ L·d） in the anaerobic reactor.The experimental results showed that removal rate of ammonia nitrogen,nitrite were 57.26%、83.07% respectively and removal rate of TN up to 74.15%,COD removal rate of 78.16% when the inorganic carbon concentration was 12mmol/L at anaerobic stage. The results showed that the appropriate inorganic carbon concentration can enhance the synergistic effect of anaerobic ammonium oxidation and denitrification,and improve the removal efficiency of nitrogen carbon. But high levels of inorganic carbon would have obvious inhibitory effect on bacteria in the system.