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Effect of carbon source and nitrate concentration on denitrifying phosphorus removal by DPB sludge 被引量:6
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作者 WANGYa-yi PENGYong-zhen +1 位作者 WangShu-ying PANMian-li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2004年第4期548-552,共5页
Effect of added carbon source and nitrate concentration on the denitrifying phosphorus removal by DPB sludge was systematically studied using batch experiments, at the same time the variation of ORP was investigated. ... Effect of added carbon source and nitrate concentration on the denitrifying phosphorus removal by DPB sludge was systematically studied using batch experiments, at the same time the variation of ORP was investigated. Results showed that the denitrifying and phosphorus uptake rate in anoxic phase increased with the high initial anaerobic carbon source addition. However once the initial COD concentration reached a certain level, which was in excess to the PHB saturation of poly-P bacteria, residual COD carried over to anoxic phase inhibited the subsequent denitrifying phosphorus uptake. Simultaneously, phosphate uptake continued until all nitrate was removed, following a slow endogenous release of phosphate. High nitrate concentration in anoxic phase increased the initial denitrifying phosphorus rate. Once the nitrate was exhausted, phosphate uptake changed to release. Moreover, the time of this turning point occurred later with the higher nitrate addition. On the other hand, through on-line monitoring the variation of the ORP with different initial COD concentration, it was found ORP could be used as a control parameter for phosphorus release, but it is impossible to utilize ORP for controlling the denitrificaion and anoxic phosphorus uptake operations. 展开更多
关键词 biological phosphorus removal carbon source NITRATE ORP denitrifying phosphorus removal bacteria (DPB) anaerobic-anoxic processes
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Simultaneous denitrification and denitrifying phosphorus removal in a full-scale anoxic–oxic process without internal recycle treating low strength wastewater 被引量:10
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作者 Qibin Wang Qiuwen Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2016年第1期175-183,共9页
Performance of a full-scale anoxic-oxic activated sludge treatment plant(4.0×10-5 m-3/day for the first-stage project) was followed during a year.The plant performed well for the removal of carbon,nitrogen and ... Performance of a full-scale anoxic-oxic activated sludge treatment plant(4.0×10-5 m-3/day for the first-stage project) was followed during a year.The plant performed well for the removal of carbon,nitrogen and phosphorus in the process of treating domestic wastewater within a temperature range of 10.8℃ to 30.5℃.Mass balance calculations indicated that COD utilization mainly occurred in the anoxic phase,accounting for 88.2% of total COD removal.Ammonia nitrogen removal occurred 13.71% in the anoxic zones and 78.77% in the aerobic zones.The contribution of anoxic zones to total nitrogen(TN) removal was 57.41%.Results indicated that nitrogen elimination in the oxic tanks was mainly contributed by simultaneous nitrification and denitrification(SND).The reduction of phosphorus mainly took place in the oxic zones,51.45% of the total removal.Denitrifying phosphorus removal was achieved biologically by 11.29%.Practical experience proved that adaptability to gradually changing temperature of the microbial populations was important to maintain the plant overall stability.Sudden changes in temperature did not cause paralysis of the system just lower removal efficiency,which could be explained by functional redundancy of microorganisms that may compensate the adverse effects of temperature changes to a certain degree.Anoxic-oxic process without internal recycling has great potential to treat low strength wastewater(i.e.,TN 〈 35 mg/L) as well as reducing operation costs. 展开更多
关键词 Wastewater treatment biological nutrient removal Simultaneous nitrification and denitrification denitrifying phosphorus removal
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Optimization of denitrifying phosphorus removal in a predenitrification anaerobic/anoxic/post-aeration+nitrification sequence batch reactor(pre-A_(2)NSBR)system:Nitrate recycling,carbon/nitrogen ratio and carbon source type 被引量:3
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作者 Weihua Zhao Meixiang Wang +5 位作者 Jianwei Li Yu Huang Baikun Li Cong Pan Xiyao Li Yongzhen Peng 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2018年第5期91-100,共10页
Because the efficiency of biological nutrient removal is always limited by the deficient carbon source for the low carbon/nitrogen(C/N)ratio in real domestic sewage,the denitrifying phosphorus removal(DNPR)was develop... Because the efficiency of biological nutrient removal is always limited by the deficient carbon source for the low carbon/nitrogen(C/N)ratio in real domestic sewage,the denitrifying phosphorus removal(DNPR)was developed as a simple and efficient method to remove nitrogen and phosphorous.In addition,this method has the advantage of saving aeration energy while reducing the sludge production.In this context,a pre-denitrification anaerobic/anoxic/post-aeration+nitrification sequence batch reactor(pre-A_(2)NSBR)system,which could also reduce high ammonia effluent concentration in the traditional two-sludge DNPR process,is proposed in this work.The pre-A_(2)NSBR process was mainly composed of a DNPR SBR and a nitrifying SBR,operating as alternating anaerobic/anoxic/post-aeration+nitrification sequence.Herein,the long-term performance of different nitrate recycling ratios(0-300%)and C/N ratios(2.5-8.8),carbon source type,and functional microbial community were studied.The results showed that the removal efficiency of total inorganic nitrogen(TIN,including NH4^(+)-N,NO_(2)^(-)-N,and NO_(3)^(-)-N)gradually increased with the nitrate recycling ratios,and the system reached the highest DNPR efficiency of 94.45% at the nitrate recycling ratio of 300%.The optimum C/N ratio was around 3.9-7.3 with a nitrogen and phosphorus removal efficiency of 80.15%and 93.57%,respectively.The acetate was proved to be a high-quality carbon source for DNPR process.The results of fluorescence in situ hybridization(FISH)analysis indicated that nitrifiers and phosphorus accumulating organisms(PAOs)were accumulated with a proportion of 19.41%and 26.48%,respectively. 展开更多
关键词 denitrifying phosphorus removal C/N ratio Nitrate recycling Carbon source type biological nutrient removal Pre-A_(2)NSBR system
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Removal of nitrogen and phosphorus in a combined A^2/O-BAF system with a short aerobic SRT 被引量:15
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作者 DING Yong-wei WANG Lin +1 位作者 WANG Bao-zhen WANG Zheng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第6期1082-1087,共6页
A bench-scale anaerobic/anoxic/aerobic process-biological aerated filter (A^2/O-BAF) combined system was carded out to treat wastewater with lower C/N and C/P ratios. The A^2/O process was operated in a short aerobi... A bench-scale anaerobic/anoxic/aerobic process-biological aerated filter (A^2/O-BAF) combined system was carded out to treat wastewater with lower C/N and C/P ratios. The A^2/O process was operated in a short aerobic sludge retention time (SRT) for organic pollutants and phosphorus removal, and denitrification. The subsequent BAF process was mainly used for nitrification. The BAF effluent was partially returned to anoxic zone of the A^2/O process to provide electron acceptors for denitrification and anoxic P uptake. This unique system formed an environment for reproducing the denitdfying phosphate-accumulating organisms (DPAOs). The ratio of DPAOs to phosphorus accumulating organisms (PAOs) could be maintained at 28% by optimizing the organic loads in the anaerobic zone and the nitrate loads into the anoxic zone in the A^2/O process. The aerobic phosphorus over-uptake and discharge of excess activated sludge was the main mechanism of phosphorus removal in the combined system. The aerobic SRT of the A^2/O process should meet the demands for the development of aerobic PAOs and the restraint on the nitrifiers growth, and the contact time in the aerobic zone of the A^2/O process should be longer than 30 min, which ensured efficient phosphorus removal in the combined system. The adequate BAF effluent return rates should be controlled with 1--4 mg/L nitrate nitrogen in the anoxic zone effluent of A^2/O process to achieve the optimal nitrogen and phosphorus removal efficiencies. 展开更多
关键词 nitrogen and phosphorus removal denitrifying phosphorus removal denitrifying phosphorus accumulating organisms (DPAOs) anaerobic/anoxic/aerobic process (A^2/O) biological aerated filter (BAF) aerobic sludge retention time (SRT)
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Operation of three parallel AN/AO processes to enrich denitrifying phosphorus removing bacteria for low strength wastewater treatment 被引量:6
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作者 XIA Si-qing LIU Hong-bo 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2006年第3期433-438,共6页
Three parallel anaerobic-anoxic/anaerobic-aerobic (AN/AO) processes were developed to enrich denitrifying phosphorus removal bacteria (DPB) for low strength wastewater treatment. The main body of the parallel AN/A... Three parallel anaerobic-anoxic/anaerobic-aerobic (AN/AO) processes were developed to enrich denitrifying phosphorus removal bacteria (DPB) for low strength wastewater treatment. The main body of the parallel AN/AO process consists of an AN (anaerobic-anoxic) process and an AO (anaerobic-aerobic) process. In the AO process, the common phosphorus accumulating organisms (PAOs) was dominate, while in the AN process, DPB was dominate, The volume of anaerobic zone(Vana):anoxie zone(Vano) : aerobic zone (Vaer) for the parallel AN/AO process is 1:1:1 in contrast with a Vana:Vaer and Vano:Vaer of 1:2 and 1:4 for a traditional biological nutrient removal process (BNR). Process 3 excels in the 3 processes on the basis of COD, TN and TP removal. For 4 month operation, the effluent COD concentration of process 3 did not exceed 60 mg/L; the effluent TN concentration of process 3 was lower than 15 mg/L; and the effluent TP concentration of process 3 was lower than 1 mg/L. 展开更多
关键词 parallel AN/AO process denitrifying phosphorus removing bacteria (DPB) low strength wastewater biological nutrientremoval (BNR)
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Characteristics of anoxic phosphors removal in sequence batch reactor 被引量:18
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作者 WANG Ya-yi PAN Mian-li +2 位作者 YAN Min PENG Yong-zhen WANG Shu-ying 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第7期776-782,共7页
The characteristics of anaerobic phosphorus release and anoxic phosphorus uptake were investigated in sequencing batch reactors using denitrifying phosphorus removing bacteria (DPB) sludge. The lab-scale experiments... The characteristics of anaerobic phosphorus release and anoxic phosphorus uptake were investigated in sequencing batch reactors using denitrifying phosphorus removing bacteria (DPB) sludge. The lab-scale experiments were accomplished under conditions of various nitrite concentrations (5.5, 9.5, and 15 mg/L) and mixed liquor suspended solids (MLSS) (1844, 3231, and 6730 mg/L). The results obtained confirmed that nitrite, MLSS, and pH were key factors, which had a significant impact on anaerobic phosphorus release and anoxic phosphorus uptake in the biological phosphorous removal process. The nitrites were able to successfully act as electron acceptors for phosphorous uptake at a limited concentration between 5.5 and 9.5 mg/L. The denitrification and dephosphorous were inhibited when the nitrite concentration reached 15 mg/L. This observation indicated that the nitrite would not inhibit phosphorus uptake before it exceeded a threshold concentration. It was assumed that an increase of MLSS concentration from 1844 mg/L to 6730 mg/L led to the increase of denitrification and anoxic P-uptake rate. On the contrary, the average P-uptake/N denitrifying reduced from 2.10 to 1.57 mg PO4^3--P/mg NO3^--N. Therefore, it could be concluded that increasing MLSS of the DEPHANOX system might shorten the reaction time of phosphorus release and anoxic phosphorus uptake. However, excessive MLSS might reduce the specific denitrifying rate. Meanwhile, a rapid pH increase occurred at the beginning of the anoxic conditions as a result of denitrification and anoxic phosphate uptake. Anaerobic P release rate increased with an increase in pH. Moreover, when pH exceeded a relatively high value of 8.0, the dissolved P concentration decreased in the liquid phase, because of chemical precipitation. This observation suggested that pH should be strictly controlled below 8.0 to avoid chemical precipitation if the biological denitrifying phosphorus removal capability is to be studied accurately. 展开更多
关键词 biological phosphorus removal NITRITE MLSS pH denitrifying phosphorus removing bacteria (DPB) anaerobic-anoxic processes
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水质特性与Dephanox工艺脱氮除磷 被引量:4
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作者 马华辉 袁林江 《山西建筑》 2007年第28期20-21,共2页
结合Dephanox工艺的流程及特点,从基质类型和C/N比及C/P比两方面对Dephanox工艺脱氮除磷效果进行了分析,对Dephanox工艺存在的问题进行了探讨,提出该工艺有待解决的研究课题。
关键词 dephanox工艺 生物脱氮除磷 反硝化聚磷
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电子受体亚硝酸氮在反硝化除磷过程中的作用 被引量:22
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作者 黄荣新 李冬 +4 位作者 张杰 李相昆 姜安玺 马立 鲍林林 《环境科学学报》 CAS CSCD 北大核心 2007年第7期1141-1144,共4页
针对先前文献提到的亚硝酸氮在反硝化除磷中存在着一定的抑制作用,以亚硝酸氮作为电子受体,对其在缺氧反硝化吸磷过程中的抑制影响进行了大量的静态烧杯试验.结果表明,在亚硝酸氮浓度大于30mg·L-1的时候,确实存在严重的抑制作用,... 针对先前文献提到的亚硝酸氮在反硝化除磷中存在着一定的抑制作用,以亚硝酸氮作为电子受体,对其在缺氧反硝化吸磷过程中的抑制影响进行了大量的静态烧杯试验.结果表明,在亚硝酸氮浓度大于30mg·L-1的时候,确实存在严重的抑制作用,而且该临界抑制浓度与污泥的特性和运行操作条件等因素有关;但是在亚硝酸氮浓度低于25mg·L-1的情况下不会对反硝化条件下磷的吸收产生毒害作用,相反地,它可以取代氧气、硝酸氮做为良好的电子受体用来进行缺氧段磷的生物摄取,在反硝化除磷中表现一定的积极作用. 展开更多
关键词 反硝化除磷菌 电子受体 反硝化生物脱氮除磷工艺 抑制浓度
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A^2O工艺处理低C/N比生活污水的试验研究 被引量:70
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作者 吴昌永 彭永臻 彭轶 《化工学报》 EI CAS CSCD 北大核心 2008年第12期3126-3131,共6页
采用52.5L的A2O试验装置处理实际生活污水,研究了A2O工艺在处理低C/N比生活污水时的脱氮除磷特性,并探讨了如何通过强化缺氧吸磷来提高系统的脱氮除磷效率。试验结果表明:在厌氧/缺氧/好氧体积比为1/1/2、HRT为8h、污泥回流比为70%、内... 采用52.5L的A2O试验装置处理实际生活污水,研究了A2O工艺在处理低C/N比生活污水时的脱氮除磷特性,并探讨了如何通过强化缺氧吸磷来提高系统的脱氮除磷效率。试验结果表明:在厌氧/缺氧/好氧体积比为1/1/2、HRT为8h、污泥回流比为70%、内回流比为300%的工况下处理C/N为7.89的生活污水,TN和SOP去除率分别能够达到85.4%和93.3%,系统中存在反硝化除磷,缺氧吸磷占总吸磷量的25.3%。同样的运行条件下处理C/N为4.20的生活污水时,SOP去除几乎不受影响,但TN去除率降低至62.2%,平均出水TN浓度也超过20mg·L-1。维持厌氧区体积不变,增大缺氧区体积,使得缺氧/好氧体积比为5/8时,TN去除率可上升到70.7%,缺氧吸磷占总吸磷量的55.2%。同时改变内回流比的试验表明250%的内回流比能最大程度地强化反硝化除磷的作用,此时TN去除率可提高至77.3%。强化A2O工艺中的反硝化除磷,能克服碳源不足对脱氮除磷的影响,显著提高低C/N比污水的脱氮除磷效率。 展开更多
关键词 污水处理 脱氮除磷 反硝化除磷 A2O工艺
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传统生物除磷脱氮工艺和反硝化除磷工艺对比 被引量:28
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作者 刘洪波 李卓 +2 位作者 缪强强 肖苏林 夏四清 《工业用水与废水》 CAS 2006年第6期4-7,共4页
介绍了传统生物除磷脱氮和反硝化除磷的机理,比较了几个有代表性的传统除磷脱氮工艺和反硝化除磷工艺。通过分析认为反硝化除磷菌(DPB)能够以硝态氮为电子受体,从而大大节省耗氧量,缓解常规工艺对外加碳源的需求。如何在不增加工艺流程... 介绍了传统生物除磷脱氮和反硝化除磷的机理,比较了几个有代表性的传统除磷脱氮工艺和反硝化除磷工艺。通过分析认为反硝化除磷菌(DPB)能够以硝态氮为电子受体,从而大大节省耗氧量,缓解常规工艺对外加碳源的需求。如何在不增加工艺流程复杂性的同时,在工艺中充分富集DPB是反硝化除磷的关键。 展开更多
关键词 生物除磷脱氨 反硝化除磷 反硝化除磷菌
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A^2O工艺处理生活污水反硝化除磷研究 被引量:9
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作者 曾薇 李磊 +2 位作者 杨莹莹 张悦 王淑莹 《北京工业大学学报》 EI CAS CSCD 北大核心 2011年第9期1407-1415,共9页
采用A2O工艺处理低ρ(C)/ρ(N)实际生活污水,研究其脱氮除磷性能和反硝化除磷特性.试验结果表明:处理低ρ(C)/ρ(N)实际生活污水时,在不设置预缺氧区、无外加碳源的情况下,A2O工艺的脱氮除磷能力受到严重影响,出水ρ(NO3--N)高达35 mg/L... 采用A2O工艺处理低ρ(C)/ρ(N)实际生活污水,研究其脱氮除磷性能和反硝化除磷特性.试验结果表明:处理低ρ(C)/ρ(N)实际生活污水时,在不设置预缺氧区、无外加碳源的情况下,A2O工艺的脱氮除磷能力受到严重影响,出水ρ(NO3--N)高达35 mg/L,TN平均去除率仅为47.1%;此时A2O工艺除磷能力较差,缺氧段有释磷现象的发生.当设置预缺氧区后,A2O工艺的脱氮除磷能力明显提高,TN平均去除率可达60.7%,PO43--P平均去除率为55.9%;此时系统存在反硝化除磷现象,缺氧段除磷率为31.4%~46.9%.在设置预缺氧区的基础上,通过外加碳源,提高进水ρ(C)/ρ(N),可进一步提高系统的脱氮除磷能力,TN平均去除率可达74.4%,出水ρ(PO34--P)小于0.5 mg/L,缺氧段除磷率高达66.2%~90.9%.同时研究了外加碳源情况下污泥内PHA成分、含量及糖原含量在A2O系统内的沿程变化趋势.经过驯化、富集,反硝化聚磷菌相对于全部聚磷菌的代谢活性从31.1%提高到74.7%.A2O工艺反硝化除磷能力的增强,提高了碳源的利用效率. 展开更多
关键词 A^2O工艺 脱氮除磷 反硝化除磷 生活污水 聚-β-羟基烷酸酯(PHA) 糖原
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Simultaneous denitrifying phosphorus accumulation in a sequencing batch reactor 被引量:3
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作者 YUAN Linjiang HAN Wei +2 位作者 WANG Lei YANG Yongzhe WANG Zhiying 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2007年第1期23-27,共5页
In order to achieve simultaneous nitrogen and phosphorus removal in the biological treatment process,denitrifying phosphorus accumulation(DNPA)and its affecting factors were studied in a sequencing batch reactor(SBR)w... In order to achieve simultaneous nitrogen and phosphorus removal in the biological treatment process,denitrifying phosphorus accumulation(DNPA)and its affecting factors were studied in a sequencing batch reactor(SBR)with synthetic wastewater.The results showed that when acetate was used as the sole carbon resource in the influent,the sludge acclimatized under anaerobic/aerobic operation had good phos-phorus removal ability.Denitrifying phosphorus accumulation was observed soon when fed with nitrate instead of aeration following the anaerobic stage,which is a vital premise to DNPA.If DNPA sludge is fed with nitrate prior to the anaerobic stage,the DNPA would weaken or even disappear.At the high concen-tration of nitrate fed in the anoxic stage,the longer anoxic time needed,the better the DNPA was.Induced DNPA did not disap-pear even though an aerobic stage followed the anoxic stage,but the shorter the aerobic stage lasted,the higher the proportions of phosphorus removal via DNPA to total removal. 展开更多
关键词 denitrifying phosphorus accumulation(DNPA) sequencing batch reactor(SBR) phosphorus accumulating organism(PAO) enhanced biological nutrient removal(EBNR) INDUCTION
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新型生物脱氮除磷技术的研究进展
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作者 韩晶晶 孙翀 +1 位作者 徐江岑 李杰 《广州化工》 CAS 2011年第10期44-46,共3页
对同时硝化反硝化、短程硝化反硝化、好氧反硝化、厌氧氨氧化及反硝化除磷脱氮等生物脱氮除磷新技术的研究和开发进行综述和讨论,分析了新技术的机理、特点和开发应用的前景。通过与现有的传统生物脱氮除磷工艺进行比较,认为今后应加强... 对同时硝化反硝化、短程硝化反硝化、好氧反硝化、厌氧氨氧化及反硝化除磷脱氮等生物脱氮除磷新技术的研究和开发进行综述和讨论,分析了新技术的机理、特点和开发应用的前景。通过与现有的传统生物脱氮除磷工艺进行比较,认为今后应加强对生物脱氮除磷,尤其是反硝化除磷机理更深入的研究,大力开发技术成熟、高效经济又符合我国国情的新工艺。 展开更多
关键词 生物脱氮除磷 反硝化除磷脱氮 工艺机理
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新型后置反硝化工艺处理低C/N(C/P)比污水脱氮除磷性能研究 被引量:22
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作者 刘钢 谌建宇 +4 位作者 黄荣新 王振兴 陈泽涛 朱亮 徐向阳 《环境科学学报》 CAS CSCD 北大核心 2013年第11期2979-2986,共8页
从内碳源有效利用角度出发,开发了新型连续流后置反硝化AOA工艺,将厌氧段混合液按一定比例分流至缺氧段,从而强化缺氧段反硝化除磷作用.进水NH+4-N和PO3-4-P浓度保持在(38.31±2.03)mg·L-1和(5.74±0.13)mg·L-1,在不... 从内碳源有效利用角度出发,开发了新型连续流后置反硝化AOA工艺,将厌氧段混合液按一定比例分流至缺氧段,从而强化缺氧段反硝化除磷作用.进水NH+4-N和PO3-4-P浓度保持在(38.31±2.03)mg·L-1和(5.74±0.13)mg·L-1,在不同运行阶段进水COD分别控制在300mg·L-1和250 mg·L-1,考察了AOA工艺处理低C/N(C/P)比污水过程影响因素.当进水C/N比和C/P比分别为7.41±0.26和52.36±1.25时,通过将SRT由10 d延长到16 d,系统TN和PO3-4-P去除率分别稳定在65.86%±2.06%和90.00%±3.97%;当进水C/N比、C/P比降至6.14±0.32和43.40±1.37时,在SRT为16 d条件下,将A/O/A体积比由1/3/1调整为1/2/2,TN和PO3-4-P去除率分别升至69.76%±3.36%和98.73%±1.82%.结果表明,采用控制SRT、调整好氧/缺氧HRT等策略,可保证处理低C/N(C/P)比污水AOA工艺高效稳定运行. 展开更多
关键词 生物脱氮除磷 后置反硝化 反硝化除磷 内碳源 C N比 C P比
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