SBBR法处理农村污水的工艺研究

以辽河流域农村居民生活污水调研数据为依据,研究SBBR反应器的最佳运行参数以及SBBR法对农村生活污水污染物的处理效果。采用对照方法对曝气方式、曝气时长等进行对照试验确立最佳工况;试验用水采用人工模拟污水,运行反应器测定COD_(Cr)、NH_(3)-N、TP等值,并对试验结果进行分析。SBBR反应器采用间歇式曝气,并在曝气时间在4 h时达到最佳运行工况;最佳工况时COD_(Cr)、NH_(3)-N、TP的去除率均值为89.14%、93.04%、72.98%。COD_(Cr)、NH_(3)-N出水达一级A,53.33%的TP出水浓度达一级B。因而SBBR系统对生活污水中的COD_(Cr)与NH_(3)-N的处理效果良好,但对TP的去除效果较差。

改性纤维素碳源对序批式生物膜反应器系统的脱氮效能影响

选取纤维素类碳源玉米芯和稻壳,用不同浓度的酸碱溶液对其进行改性处理,筛选出能够缓慢释碳且氮磷含量较低的理想碳源,研究它在序批式生物膜反应器(SBBR)中对低碳氮比污水脱氮效果的影响。实验结果表明,经质量分数为7%的NaOH改性处理后的玉米芯在碳氮磷的释放量以及可生化性等方面均表现良好,可作为调节低碳氮比污水的缓释碳源。对比未投加改性玉米芯的反应器出水效果,投入改性玉米芯后SBBR系统的氨氮去除率由原来的60%提升至73%左右,TN去除率由原来的50%提高到60%左右,系统对COD仍然具有较好的去除效果,这表明经7%NaOH改性后的玉米芯是良好的缓释碳源,能有效提高SBBR系统对低碳氮比污水的脱氮能力。

Impact of salinity on treatment of saline wastewater by sequencing batch biofilm reactor process

High salinity industrial wastewater is difficult to treat using biological treatment system because of the high concentrations of salt.The potential of a sequencing batch biofilm reactor(SBBR)process in treating synthetic high salinity wastewater was evaluated at laboratory scale during a 110-day operation.The reactor was operated in a 12 h cycle,and each cycle consisted of 0.25 h influent addition,8 h aeration,3 h anoxic reaction,0.5 h sedimentation and 0.25 h effluent withdrawal.Gradual increase in salinity gradient was applied during the acclimatization period.The acclimated SBBR system was demonstrated to be an effective process to remove organic compounds and ammonia nitrogen under high salinity conditions with chemical oxygen demand(COD)and ammonia nitrogen(NH3-N)removal efficiencies of 88% and 80%,respectively.The microscopic examination indicated that rather than rotifers or vorticella,the zoogloea,filamentous fungus mingled with a small quantity of swimming infusorians were dominant bacteria in SBBR system.The removal efficiencies close to 80% in COD and 75% in NH3-N were achieved at an organic loading rate(OLR)of 0.96 kg COD/(m3·d),pH of 7.0,salinity of 14 g/L and NH3-N of 30 mg/L.