后置曝气膜法双污泥工艺运行特性
发布时间：2019-05-28 08:14
【摘要】：我国南方城市生活污水具有低COD/P的水质特性,传统工艺处理COD/P比较低的污水时氮、磷很难同时达标。反硝化除磷工艺具有良好的同步脱氮除磷效果,同时能节约碳源、降低污泥产量。本课题针对COD/P比较低的城市生活污水,以现有的A_2N双污泥工艺为基础,提出一种新改进的双污泥脱氮除磷工艺,即后置曝气膜法双污泥工艺(A_2NO-MBR);本论文主要研究该工艺处理模拟生活污水和实际生活污水的运行特性及系统的菌群结构变化特征。(1)A_2NO-MBR工艺处理模拟生活污水,当COD/P分别为20,30,40,50和60时,出水COD均低于30mg/L,出水氨氮分别为1mg/L,2.5mg/L,7.3mg/L,6.92mg/L和5.59mg/L,出水TN分别为16.96mg/L、14.5mg/L、11.4mg/L、9.92mg/L和8.94mg/L,当COD/P比为30-60时,出水TP小于0.15mg/L,而COD/P比为20时,出水TP为0.73mg/L;p H和ORP的在线监测可用来反映厌氧释磷、缺氧反硝化除磷的进程,ORP还能指示厌氧释磷程度;DO和p H可以联合指示硝化反应的终点,故p H和ORP可用来指示A_2NO-MBR工艺中的厌氧释磷和缺氧吸磷过程特征。(2)A_2NO-MBR工艺处理模拟生活污水,随着COD/P比的降低,污泥的活性逐渐下降;COD/P比为60厌氧初期释磷速率和污泥含磷量变化最大,COD/P比为50、40和30系统次之,COD/P比为20系统最小,厌氧阶段COD浓度的变化与污泥的释磷量呈线性关系;随着进水COD/P比的升高,反硝化除磷速率与好氧除磷速率比例在不断下降,最高达到96.4%;在缺氧阶段和后置曝气阶段除磷微生物可利用体内的储藏PHB作为电子供体进行反硝化除磷和好氧除磷。(3)微生物学分析结果表明,种泥与系统污泥样品在门级别上均以Proteobacteria(变形菌门)为主导;模拟生活污水COD/P比为50、模拟生活污水COD/P比为20及实际生活污水的A_2OSBR系统污泥中Proteobacteria、Bacteroidetes、Chloroflexi、Chlorobi四种门的比例均高于90%,种泥次之,在N-MBR系统污泥中最少。在属级别上,模拟生活污水COD/P比为50、模拟生活污水COD/P比为20及实际生活污水的A_2OSBR系统污泥中与聚磷有关的Candidatus Accumulibacter和Dechloromonas所占比例较大,分别为20.9%、10.89%和13.5%,而与聚糖菌有关的Candidatus Competibacter依次为9.44%、10.94%和15.07%;Nitrospira(硝化螺旋菌)和Nitrosomonas(亚硝化菌属)在N-MBR池中明显得到富集。(4)A_2NO-MBR工艺处理实际生活污水结果表明,进水COD、氨氮、TN和TP分别为100~320mg/L、50~57mg/L、52~59mg/L和4mg/L左右;COD/P比为27、52和75出水TN依次为22.5mg/L、15.56mg/L和13.48mg/L,出水COD均低于30mg/L,出水氨氮为8.53mg/L~9.63mg/L,出水TP均低于0.5mg/L;COD的去除主要发生在厌氧段,厌氧期间COD的利用率随COD/P升高而上升,高COD/P比系统厌氧末端COD和TP浓度远高于低COD/P比系统,COD的去除速率和释磷速率与进水COD/P比呈正相关性;系统及缺氧期间的TN去除率随着COD/P比的升高而上升,而NH_4~+-N去除的变化不明显,且低COD/P比系统缺氧末端出现明显的硝酸盐累积;缺氧期间TP的去除速率与TN和NO_3~--N的去除速率成正相关性。
[Abstract]:The domestic sewage in the southern city of China has the characteristics of low COD/ P, and the wastewater with low COD/ P is difficult to reach the standard at the same time. The denitrification and phosphorus removal process has good synchronous nitrogen and phosphorus removal effect, meanwhile, the carbon source can be saved, and the sludge yield can be reduced. On the basis of the existing A _ 2N double-sludge process, a new and improved double-sludge nitrogen and phosphorus removal process, that is, a post-aeration membrane double-sludge process (A _ 2NO-MBR), is put forward based on the existing A _ 2N double-sludge process. This paper mainly studies the operation characteristics of the simulated domestic sewage and the actual domestic sewage, and the characteristics of the structure of the bacteria in the system. (1) A _ 2NO-MBR process is used to process the simulated domestic sewage. When the COD/ P is 20,30,40,50 and 60, the effluent COD is lower than 30mg/ L, and the effluent ammonia nitrogen is 1 mg/ L, 2.5 mg/ L, 7.3 mg/ L, 6.92 mg/ L and 5.59 mg/ L, respectively. The effluent TN is 16.96 mg/ L, 14.5 mg/ L, 11.4 mg/ L, 9.92 mg/ L and 8.94 mg/ L, respectively, when the COD/ P ratio is 30-60, the effluent TP is less than 0.15 mg/ L, and the COD/ P ratio is 20, the effluent TP is 0.73 mg/ L; the on-line monitoring of the p H and the ORP can be used to reflect the process of anaerobic phosphorus release, anoxic denitrification and phosphorus removal, the ORP can also indicate the degree of anaerobic phosphorus release, DO and p H can jointly indicate the end point of the nitrification reaction, Therefore, p H and ORP can be used to indicate the process characteristics of anaerobic phosphorus release and anoxic phosphorus absorption in the A _ 2 NO-MBR process. (2) A _ 2NO-MBR process is used to process the simulated domestic sewage, with the decrease of the COD/ P ratio, the activity of the sludge is gradually decreased, the COD/ P ratio is 60 anaerobic initial phosphorus release rate and the sludge phosphorus content change is the largest, the COD/ P ratio is 50,40 and 30 are the second, the COD/ P ratio is 20 system minimum, The change of COD concentration in the anaerobic stage is linear with that of the sludge; with the increase of the COD/ P ratio of the influent, the rate of denitrification and phosphorus removal rate and the rate of the aerobic phosphorus removal rate decrease continuously, up to 96.4%; In that anoxic stage and post-aeration stage, the phosphorus-removal microorganism can use the storage PHB in the body as an electron donor for denitrification and dephosphorization and aerobic phosphorus removal. (3) The results of the microbiological analysis show that the sludge samples and the sludge samples of the system are dominated by the Proteobacteria. The COD/ P ratio of the simulated domestic sewage is 50, and the COD/ P ratio of the simulated domestic sewage is 20, and the sludge of the A _ 2OSBR system of the actual domestic sewage is Proteobacteria, Bacteroides, and Chloroform, The proportion of the four types of the chlorobis is higher than 90%, the seed mud is the second, and the sludge in the N-MBR system is the least. The ratio of COD/ P ratio of simulated domestic sewage to COD/ P ratio of 50, simulated domestic sewage COD/ P ratio of 20 and actual domestic sewage was 20.9%, 10.89% and 13.5%, respectively. 10.94% and 15.07%; Nitroca (Nitrifying bacteria) and Nitromonas (Nitrosomonas) were significantly enriched in the N-MBR pool. (4) The results of A _ 2NO-MBR process on the actual domestic sewage show that the influent COD, ammonia nitrogen, TN and TP are 100-320 mg/ L,50-57 mg/ L,52-59 mg/ L and 4 mg/ L, respectively; the COD/ P ratio is 27,52 and 75, the effluent TN is 22.5 mg/ L, 15.56 mg/ L and 13.48 mg/ L, the effluent COD is lower than 30 mg/ L, the effluent ammonia nitrogen is 8.53 mg/ L-9.63 mg/ L, and the effluent TP is lower than 0.5 mg/ L; The removal of COD mainly occurs in the anaerobic section, the utilization rate of COD in the anaerobic period increases with the increase of COD/ P, the COD and TP concentration of the anaerobic end of the high COD/ P ratio system are much higher than that of the low COD/ P ratio system, and the removal rate and the phosphorus release rate of the COD are positive correlation with the influent COD/ P ratio; The TN removal rate of the system and the anoxic period increased with the increase of COD/ P ratio, while the change of the removal of NH _ 4 ~ +-N was not obvious, and the low COD/ P ratio showed significant nitrate accumulation at the anoxic end of the system. The removal rate of TP during hypoxia was positively correlated with the removal rate of TN and NO _ 3 ~-N.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
本文编号：2486893
[Abstract]:The domestic sewage in the southern city of China has the characteristics of low COD/ P, and the wastewater with low COD/ P is difficult to reach the standard at the same time. The denitrification and phosphorus removal process has good synchronous nitrogen and phosphorus removal effect, meanwhile, the carbon source can be saved, and the sludge yield can be reduced. On the basis of the existing A _ 2N double-sludge process, a new and improved double-sludge nitrogen and phosphorus removal process, that is, a post-aeration membrane double-sludge process (A _ 2NO-MBR), is put forward based on the existing A _ 2N double-sludge process. This paper mainly studies the operation characteristics of the simulated domestic sewage and the actual domestic sewage, and the characteristics of the structure of the bacteria in the system. (1) A _ 2NO-MBR process is used to process the simulated domestic sewage. When the COD/ P is 20,30,40,50 and 60, the effluent COD is lower than 30mg/ L, and the effluent ammonia nitrogen is 1 mg/ L, 2.5 mg/ L, 7.3 mg/ L, 6.92 mg/ L and 5.59 mg/ L, respectively. The effluent TN is 16.96 mg/ L, 14.5 mg/ L, 11.4 mg/ L, 9.92 mg/ L and 8.94 mg/ L, respectively, when the COD/ P ratio is 30-60, the effluent TP is less than 0.15 mg/ L, and the COD/ P ratio is 20, the effluent TP is 0.73 mg/ L; the on-line monitoring of the p H and the ORP can be used to reflect the process of anaerobic phosphorus release, anoxic denitrification and phosphorus removal, the ORP can also indicate the degree of anaerobic phosphorus release, DO and p H can jointly indicate the end point of the nitrification reaction, Therefore, p H and ORP can be used to indicate the process characteristics of anaerobic phosphorus release and anoxic phosphorus absorption in the A _ 2 NO-MBR process. (2) A _ 2NO-MBR process is used to process the simulated domestic sewage, with the decrease of the COD/ P ratio, the activity of the sludge is gradually decreased, the COD/ P ratio is 60 anaerobic initial phosphorus release rate and the sludge phosphorus content change is the largest, the COD/ P ratio is 50,40 and 30 are the second, the COD/ P ratio is 20 system minimum, The change of COD concentration in the anaerobic stage is linear with that of the sludge; with the increase of the COD/ P ratio of the influent, the rate of denitrification and phosphorus removal rate and the rate of the aerobic phosphorus removal rate decrease continuously, up to 96.4%; In that anoxic stage and post-aeration stage, the phosphorus-removal microorganism can use the storage PHB in the body as an electron donor for denitrification and dephosphorization and aerobic phosphorus removal. (3) The results of the microbiological analysis show that the sludge samples and the sludge samples of the system are dominated by the Proteobacteria. The COD/ P ratio of the simulated domestic sewage is 50, and the COD/ P ratio of the simulated domestic sewage is 20, and the sludge of the A _ 2OSBR system of the actual domestic sewage is Proteobacteria, Bacteroides, and Chloroform, The proportion of the four types of the chlorobis is higher than 90%, the seed mud is the second, and the sludge in the N-MBR system is the least. The ratio of COD/ P ratio of simulated domestic sewage to COD/ P ratio of 50, simulated domestic sewage COD/ P ratio of 20 and actual domestic sewage was 20.9%, 10.89% and 13.5%, respectively. 10.94% and 15.07%; Nitroca (Nitrifying bacteria) and Nitromonas (Nitrosomonas) were significantly enriched in the N-MBR pool. (4) The results of A _ 2NO-MBR process on the actual domestic sewage show that the influent COD, ammonia nitrogen, TN and TP are 100-320 mg/ L,50-57 mg/ L,52-59 mg/ L and 4 mg/ L, respectively; the COD/ P ratio is 27,52 and 75, the effluent TN is 22.5 mg/ L, 15.56 mg/ L and 13.48 mg/ L, the effluent COD is lower than 30 mg/ L, the effluent ammonia nitrogen is 8.53 mg/ L-9.63 mg/ L, and the effluent TP is lower than 0.5 mg/ L; The removal of COD mainly occurs in the anaerobic section, the utilization rate of COD in the anaerobic period increases with the increase of COD/ P, the COD and TP concentration of the anaerobic end of the high COD/ P ratio system are much higher than that of the low COD/ P ratio system, and the removal rate and the phosphorus release rate of the COD are positive correlation with the influent COD/ P ratio; The TN removal rate of the system and the anoxic period increased with the increase of COD/ P ratio, while the change of the removal of NH _ 4 ~ +-N was not obvious, and the low COD/ P ratio showed significant nitrate accumulation at the anoxic end of the system. The removal rate of TP during hypoxia was positively correlated with the removal rate of TN and NO _ 3 ~-N.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
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