单一反应体系曝气量与污泥质量浓度对同步硝化反硝化的影响  

Effects of aeration rate and MLSS on simultaneous nitrification and denitrification in single reaction system

作　　者：陈英文[1] 魏基业[1] 赵冰怡[1] 沈树宝[1] 

机构地区：[1]南京工业大学生物与制药工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2011年第3期38-42,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50872052);国家高技术研究发展计划(863计划)资助项目(2009AA05Z313);国家水体污染控制与治理科技重大专项资助项目(2008ZX07101-003-02-05);江苏省环保科研课题资助项目(2009002);江苏省自然科学基金资助项目(BK2007188)

摘　　要：利用自培养硝化污泥与实验室筛选的1株反硝化细菌共培养形成共生污泥,构建膜生物反应器（MBR）单一反应体系同步硝化反硝化系统,得到系统良好同步硝化反硝化曝气量和污泥浓度的最优条件。由试验结果可知：在混合污泥质量浓度（MLSS）6.0~10.0 g/L时,调节曝气量,可以使单污泥同步硝化反硝化总氮（TN）去除率达到85%以上。不同MLSS下,达到最高TN去除率的最佳曝气量随着MLSS增高而向高曝气量偏移。随着MLSS增高,响应因子F变小,由曝气量的变化而引起的TN去除率变化明显变缓,表示MLSS对O2传递的缓冲能力越强。在MLSS为8 g/L条件下,低负荷比较容易达到较高的TN去除率,而高负荷下需要更高的曝气量以获得高的TN去除率,系统适合的NH4＋-N负荷范围0~0.30 kg/（m3.d）。MLSS≥3.0 g/L,出水化学需氧量（COD）低于50 mg/L,COD大部分贡献于反硝化所需C源。单一反应体系同步硝化反硝化系统能对负荷的改变作出及时的回应,整体上运行比较稳定。A single reaction membrane bio-reactor（MBR） system with simultaneous nitrification and denitrification（SND） was constructed coupling with the hybrid cultured sludge by nitrification sludge and denitrification bacteria.The effect of aeration rate and mixed liquor suspended solids（MLSS） on the SND was studied.When the range of MLSS was 6.0-10.0 g/L in the single sludge system,the total nitrogen（TN） removal efficiency by SND reached above 85% on the suitable aeration rate,and the best aeration rate for the maximum TN removal efficiency on different MLSS became bigger with the increasing of MLSS.A smaller response factor F,the less change of TN removal efficiency was caused by aeration rate and the stronger buffering effect on the oxygen transfer with the increasing of MLSS.Operated in the MLSS of 8.0 g/L,higher TN removal efficiency was easy to be obtained in the low ammonia loading,but the higher aeration rate was needed for a better TN removal efficiency in the high ammonia loading.The range of ammonia loading for a suitable operation was 0-0.30 kg/（m3·d）.When MLSS≥3.0 g/L,the chemical oxygen demand（COD） in effluent was below 50 mg/L,and the greater part of COD was contributed to denitrification.The system could timely respond to the change of loadings and operate stably.

关 键 词：单污泥系统 曝气量 混合污泥质量浓度 同步硝化反硝化 

分 类 号：X703.1[环境科学与工程—环境工程]