SNAD-MBBR处理垃圾渗滤液厌氧出水的脱氮研究

Nitrogen Removal from Anaerobic Effluent of Landfill Leachate by SNAD-MBBR Process

利用移动床生物膜反应器(MBBR)对亚硝化-厌氧氨氧化-反硝化(SNAD)工艺处理垃圾渗滤液厌氧出水的脱氮效果进行了研究。SNAD-MBBR反应器内投加K3填料,控制温度为33～35℃、DO为0. 03～0. 1 mg/L、pH值为7. 5～8. 0、HRT为12 h,试验一共进行了152 d,在进水总氮负荷逐渐增加过程中相应调节曝气量以获得最佳去除效果。结果表明,在该工艺条件下进水总氮负荷为0. 9 kg/(m^3·d)时,TN去除率仍可达88%。当进水总氮负荷继续提高至1 kg/(m^3·d)时,由于进水中的有机物浓度较高以及多种异养好氧菌的繁殖,抑制了亚硝化及厌氧氨氧化过程,致使反应器脱氮效率明显降低,仅为20%左右。

Simultaneous partial nitrification,Anammox and denitrification (SNAD)process was operated to investigate its nitrogen removal performance in a moving bed biofilm reactor(MBBR).The influent of SNAD -MBBR process was anaerobic effluent of landfill leachate.The reactor was filled K3 cartier,and the temperature,DO,pH and HRT was controlled at 33-35℃,0.03-0.1mg/L,7.5-8.0 and 12h respectively.The experiment lasted for 152 days,and the best removal effect was obtained by adjusting the aeration rate accordingly during the gradual increase of the irtfluent total nitrogen load:Under the above conditions,when the total nitrogen load rate was 0.9kg/(m3·d),the TN removal rate could still reach 88%.When the influent total nitrogen load rate was increased to 1kg/(m3·d),the TN removal rate was significantly reduced to only 20% due to the high concentration of organics in the influent and the inhibition of nitrite and anaerobic ammonia oxidation processes by the reproduction of heterotrophic aerobic bacteria.