共查询到18条相似文献,搜索用时 109 毫秒
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采用竖式SBR作为反应器,利用城市污水处理厂剩余污泥作为接种污泥,通过不间断运行培养出好氧颗粒污泥。实验结果表明,采用非限量曝气模式好氧颗粒污泥降解模拟污水的效果较好,其COD去除率可达98%以上。曝气量对好氧颗粒污泥的形成和稳定具有重要影响,当气速为26.5m/h时,好氧颗粒污泥的性状和处理有机废水效果最佳。同时好氧颗粒污泥对pH值的变化不明显,当pH为5—8范围内,其COD去除率都可达到85%以上。但是未经驯化的好氧颗粒污泥对对硝基苯酚和对氯苯酚两种芳香类有机物较敏感,而对硝基苯酚对其毒性更大。当对硝基苯酚和。对氯苯酚浓度为10mg/L时,其COD去除率仅为42.5%和52%。 相似文献
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HSMBR系统表现了对于COD高且稳定的去除效果。对于TN、TP,由于不排泥,污泥浓度的升高,并且填料内部的生物膜不断形成,以及在填料内部的污泥受曝气的扰动小,而变的较为密实,反应器内形成好氧、缺氧两种微环境并存,有利于系统对于TN、TP去除率的提高。 相似文献
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为提高西部某污水厂出水水质达到地表水准Ⅳ类标准,对该水厂进行工程改造及优化运行。通过采用投加耐冷微生物、好氧池投加填料,改造微生物膜——活性污泥复合工艺,以及调试运行参数以及间歇曝气等措施观察COD、氨氮、TN和TP去除效果的变化,最后辅以高效混凝沉淀池保证出水达标。实验结果表明:好氧池末端DO降到1mg/L时,出水TN浓度减少到17.57mg/L,TP浓度减少到0.48mg/L,氨氮和COD仍去除稳定;TN去除效果随着分点进水量增加而提高,出水TN平均浓度降到14.13mg/L;污泥回流比由100%减少到60%,TN去除率提高,出水TN平均浓度降到13.14mg/L;通过将好氧区改为间歇曝气后,氨氧化菌和反硝化除磷菌成为优势菌种,加强了氮磷的去除,出水TN、TP浓度分别为11.80mg/L和0.35mg/L,TP仍需。经过优化运行后出水水质稳定达到要求,并有效的解决了氧化沟反应池内溶解氧盈余、污泥浓度控制等问题,同时起到很好的节能降耗效果。 相似文献
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本文研究了好氧颗粒污泥系统中,温度、pH、曝气强度、邻苯二酸(Phthalic Acid,PA)及氨氮(NH3-N)对邻苯二甲酸二甲酯(Dimethyl Phthahte,DMP)降解效果的影响,结果表明:好氧颗粒污泥降解DMP的最佳温度、最佳PH值范围、最佳曝气强度分别为25℃~45℃、7.0 ~9.0、1.38 cm/s.当PA浓度为100 mg/L、300 mg/L,PA对DMP降解起促进作用;当PA浓度为500 mg/L、800 mg/L,PA对DMP降解起抑制作用.进水中50 mg/L的氨氮浓度对DMP降解的影响不大.本研究中采用的19种运行工况条件中,除曝气强度为0.33 cm/s以外,其他18种运行工况条件下,当运行时间达到300 min时,DMP的浓度都小于1.0 mg/L,因此,当水力停留时间达到5h以上时,温度、pH、PA、氨氮对DMP降解速率的影响基本上可以忽略不计. 相似文献
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文章应用MBBR(流动床生物膜反应器)工艺对某石化公司生活污水处理装置进行改造,并研究影响该工艺高效脱氮的主要因素,即pH值、DO含量和污泥回流比。结果表明:实际运行中,pH值控制在7.5、DO在1~4mg/L、污泥回流比R≤3,能取得较好的脱氮效果,将氨氮降至3mg/L以下,同时,将污泥浓度维持在5~8g/L,还可在短时间内实现CODCr高去除率。实践证明,MBBR工艺在生活污水完善项目中的应用,能够有效降低污水中污染物含量,为后续深度处理系统的稳定运行提供可靠保障。 相似文献
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Abdolmotaleb Seid-Mohammadi Ghorban Asgari Mohammad Rafiee Mohammad Taghi Samadi Fatemeh Nouri Meghdad Pirsaheb Fateme Asadi 《环境质量管理》2023,32(3):135-146
Leachate generated in a landfill may not be treated by conventional biological treatment due to its nature and complexity. The process of forming aerobic granules in batch sequencing reactors having features such as; reducing the settling process time and saving energy consumption and high decomposition rate have been noticed by researchers. In the present study, the structure of sequencing batch reactors (SBRs) was evaluated for the formation of granules, which were subsequently utilized for the treatment of landfill leachate. The experiment was initiated by using the GSBR, containing 1200 ml with different apparatuses, to develop granular sludge, and synthetic wastewater was added to reinforcement. The selected parameters for the operational hydraulic retention time (HRT) of the wastewater (6-h cycles) included feeding, idle, aeration, settling, and discharge. Furthermore, the controlled conditions were the dissolved oxygen (DO) range of 2–2.2 mg/L, temperature range of 20–23℃, and pH of 7.5–8.3. The chemical oxygen demand (COD), mixed liquor suspended solids (MLSS), and sludge volume index (SVI) daily were measured at the influent and effluent of GSBR reactor. The main properties of aerobic granular sludge were identified during the research procedures, and the remarkable settling and potent, high-density microbial structure of the granules were confirmed. The mean size of the formulated granules was estimated at 7.46 ± 1.8 mm, and the volume of the biomass also increased from approximately 1607 to 4137 mg/L through the granulation process. Moreover, 98% of the influent chemical oxygen demand (COD) could be removed by the formulated granular sludge, and the final-stage organic loading rate was estimated at 5.65 COD/m3/day. According to the results, GSBRs could be employed for the formulation of aerobic granular sludge for the treatment of landfill leachate. 相似文献
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Guang Hao Chen Wun Jern Ng Hiroaki Ozaki Yutaka Terashima 《Resources, Conservation and Recycling》1994,11(1-4)
The concentration of dissolved oxygen (DO) strongly influences the performance of aerobic biofilm reactors because organic oxidation is limited by the availability of oxygen. However, it is not necessary to maintain a high DO level in the reactors in order to overcome this limitation. Excessive aeration wastes energy. Therefore, the determination of the onset of DO limitation against organic substrate removal in aerobic biofilm reactors is important for their effective operation. This study is aimed at developing an expression to determine the onset of DO limitation and hence to control the aeration system. The expression developed is as follows:
, where Sb and Cb are the bulk concentrations of organic substrate and DO, respectively; Dws and Dwc are the diffusion coefficients of organic substrate and oxygen in the reactors respectively; and Rb is an overall ratio of oxygen consumption to organic substrate removal in the reactors. The latter is the key parameter in the equation, and is determined by the characteristics of the substrate, biofilm, and reactor. In order to measure the value of Rb, the authors have developed a micro-biofilm reactor. The value of Rb was determined to be 0.13 (mg O2 mg−1 CODcr) for glucose removal with this reactor. The equation has, subsequently, been verified with data from batch and continuous experiments. 相似文献
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Allocation of supplementary aeration stations in the Chicago waterway system for dissolved oxygen improvement 总被引:4,自引:0,他引:4
The Chicago Waterway System (CWS), used mainly for commercial and recreational navigation and for urban drainage, is a 122.8 km branching network of navigable waterways controlled by hydraulic structures. The CWS receives pollutant loads from 3 of the largest wastewater treatment plants in the world, nearly 240 gravity Combined Sewer Overflows (CSO), 3 CSO pumping stations, direct diversions from Lake Michigan, and eleven tributary streams or drainage areas. Even though treatment plant effluent concentrations meet the applicable standards and most reaches of the CWS meet the applicable water quality standards, Dissolved Oxygen (DO) standards are not met in the CWS during some periods. A Use Attainability Analysis was initiated to evaluate what water quality standards can be achieved in the CWS. The UAA team identified several DO improvement alternatives including new supplementary aeration stations. Because of the dynamic nature of the CWS, the DUFLOW model that is capable of simulating hydraulics and water quality processes under unsteady-flow conditions was used to evaluate the effectiveness of new supplementary aeration stations. This paper details the use of the DUFLOW model to size and locate supplementary aeration stations. In order to determine the size and location of supplemental aeration stations, 90% compliance with a 5 mg/l DO standard was used as a planning target. The simulations showed that a total of four new supplementary aeration stations with oxygen supply capacities ranging from 30 to 80 g/s would be sufficient to meet the proposed target DO concentration for the North Branch and South Branch of the Chicago River. There are several aeration technologies, two of which are already being used in the CWS, available and the UAA team determined that the total capital costs of the alternatives range from $35.5 to $89.9 million with annual operations and maintenance costs ranging from $554,000 to $2.14 million. Supplemental aeration stations have been shown to be a potentially effective means to improve DO concentrations in the CWS and will be included in developing an integrated strategy for improving water quality in the CWS. 相似文献
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本文介绍了在污水处理中好氧阶段的可不停产检修的曝气系统,重点阐述了实现不停产检修的曝气系统的曝气器选用及下垂式曝气系统、上浮式曝气平台、漂浮式曝气悬链三种布气装置。该技术能够实现污水处理厂的不停产检修,保证污水处理设施的连续运行,具有很高的推广价值。 相似文献
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A study was conducted to examine N and P removal by a laboratory-scale extended aeration treatment system employing oxidation-reduction potential (ORP) controlled aeration. The system was provided with a 90-L aeration tank. When ORP controlled aeration was applied, the aeration tank was divided into three zones, namely the ORP zone (45 L), the anaerobic zone (27 L) and the aerobic zone (18 L). An external anoxic selector of 3.8 L in volume was also added. An ORP set point of 70 mV was used for the ORP zone. The extended aeration treatment system operating without the ORP controlled aeration was used as the control.COD removal (97%) was not affected, but both N and P removal were enhanced significantly in the ORP reactor. Total N removal efficiency was increased from 49.1% (control) to 83.5%. Almost all P was captured (99%), leaving an average of 0.09 mg L−1 P in the effluent. The ORP reactor yielded a sludge P content of 3.1%, compared to only 1.8% for the control. This indicated luxury P uptake in ORP reactor. Very significant P release and denitrification were found in the anoxic selector. Fairly good simultaneous nitrification and denitrification had occurred in the ORP zone. However, P release was very limited in the anoxic zone. However, anoxic P uptake and nitrification were found in this zone.Low F/M bulking was observed in both the control and ORP operation before the installation of a selector. Bacterial Type 0041 was identified as the predominant bulking organism. For the Control, an aerobic selector cured the bulking problem in one sludge age while an anoxic selector fixed up the problem during the ORP operation. 相似文献
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John R. Thene Heinz G. Stefan Ekaterini I. Daniil 《Journal of the American Water Resources Association》1989,25(6):1189-1198
ABSTRACT: A method to evaluate the effect of hydropower development on downstream dissolved oxygen (DO) is presented for a low head dam. Water, previously aerated during release over spillways and under gates, is diverted through the hydropower facility without further aeration. The oxygen transfer that occurs as a result of air entrainment at the various release points of a dam is measured. Oxygen transfer efficiencies are calculated and incorporated into an oxygen transfer model to predict average release DO concentrations. This model is used to systematically determine the effect of hydropower operation on downstream DO. Operational alternatives are investigated and a simple operational guide is developed to mitigate the effects of hydropower operation. Combinations of reduced generation and optimal releases from the dam allow the hydropower facility to operate within DO standards. 相似文献