ASBR与脉冲进水SBR组合工艺处理垃圾渗滤液

Treatment of Wastewater with High Concentration of Ammonia Nitrogen through ASBR Combining with Pulsed SBR

为了研究厌氧-好氧工艺处理垃圾渗滤液的脱氮性能,采用ASBR联合脉冲进水SBR(脉冲SBR)处理高氨氮实际垃圾渗滤液。ASBR的水力停留时间为2d;中间水箱调节脉冲SBR的进水C/N(3～5)和NH4+-N浓度;脉冲SBR采用3次等量进水模式,运行周期分为4个缺氧段和3个好氧段,不投加外碳源,缺氧4利用污泥内碳源进行反硝化。结果表明,串联运行时期(157d)系统获得了高效的脱氮性能。ASBR进水COD为7 338～10 445mg.L-1,去除率在83%以上;脉冲SBR进水NH4+-N浓度分4个阶段逐步提高至912.0±41.7mg.L-1,总氮(TN)去除率在90%以上,出水总氮小于40mg.L-1;系统COD和总氮去除率分别在87%和97%以上。单个缺氧4进程内的内源反硝化速率(DNR)会由快变慢,而其平均理论内源反硝化速率(TDNRm)达到了1.531mgN.h-1.gMLVSS-1。在不使用物化预处理和不投加外碳源的情况下实现了对渗滤液的深度脱氮。

In order to analyze the nitrogen removal performance of anaerobic-aerobic process treating landfill leachate, a system combining ASBR with pulsed SBR was applied to treat real landfill leachate with high concentration of ammonia nitrogen. The HRT of ASBR was 2 d; middle water tank regulated the COD/ NH＋ -N （3-5） and NH4＋ -N concentration of pulsed SBR＇s influent; the cycle of pulsed SBR consisted of four anoxic stages and three oxic stages in which three equal feeds model was applied. In the fourth anoxic stage （An4）, internal carbon source was used to implement denitrification without any extra carbon source addition. The results indicate that efficient nitrogen removal performance of this system was achieved in the series running period （157 d）. Influent chemical oxygen demand （COD） concentration of ASBR was from 7 338 mg ~ L 1to 1 0445 mg · L-1 of which above 83% was removed pulsed SBR＇s influent NH＋ --N concentration could be divided into four phases in which improving from 296. 1 4-14. 5 mg · L-1 to 912.04-41.7 mg · L-1, and the effluent total nitrogen （TN） concentration of pulsed SBR was below 40 mg · L-1 all the time, which means TN removal rate reached over 90%. To sum up, the COD and TN removal rate of the combined system were above 87% and 97%, respectively. Endogenous denitrification rate（DNR） of An4 changed from the fast one to the slow one, and the mean value of theoretical denitrification rate （TDNRm） of pulsed SBR＇s An4eould reach 1. 531 mg N · h--1 gMLVSS--1. Advanced nitrogen removal of the system was realized without extra carbon source addition and physicochemieal pre-treatment.