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《Desalination》2007,202(1-3):59-67
Nowadays, water is deteriorating for several reasons, such as an increase in wastewater that flows into rivers and the limitation of water resources. Therefore, we have concentrated our plans on securing water resources by reusing wastewater treatment effluent. In this study the reuse system was organized using a submerged membrane bioreactor (SMBR) consisting of an anoxic, select, and aerobic tank. Our plan to solve the problems mentioned above involved optimizing the operating hydraulic retention time (HRT), which was done by comparing the characteristics of water treatment for several HRTs. Also, the simple and vertical double membrane modules were analyzed to find more effective operating condition in SMBR. The Specific characteristics of the SMBR system were represented as follows. We could know below 10 mg/L of BOD, below 5 mg/L of COD, 0 mg/L of SS without changes of HRT, which was satisfied with the standard of reuse water. Optimized HRT was 2.3 h and by composing the vertical double membrane modules, air flow rate could be reduced by 28.5%, lower than that of the simple membrane module. 相似文献
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Nitrification and sludge characteristics in a submerged membrane bioreactor on synthetic inorganic wastewater 总被引:2,自引:0,他引:2
A submerged membrane bioreactor (SMBR) treating ammonia-bearing synthetic inorganic wastewater withoutsludge purge was studied in respect to nitrification and microbial parameters over a period of 210 days. The reactor was operated at a hydraulic retention time (HRT) of 24 h, and the NH4-N volumetric loading rate increased from 0.18 to 1.30 kg NH4+-N m−3d−1 by increasing influent NH4+-N from 180 mg/l−1 to 1300 mg/l−1. With the exception of a short period after the failure of pH control, the NH4+-N+ removal rate, was constantly above 99%. Due to the influent characteristics and the interception of the membrane module, the mixed liquor suspended solids (MLSS) varied from 3000 to 5000 mg/l−1 and the nitrifying bacteria were dominant in the SMBR. The numbers of ammonia oxidizers and nitrite oxidizers in the mixed liquor increased from 0.9×108 ml−1 and 1.0×108 ml to 1.6×108 ml−1 and 9×108 ml−1 respectively, and the specific nitrification rate from 0.27 to 0.56 g NH4+-N g−1 SS−1 d−1. An increasing occurrence of extracellular polymeric substances (EPS) around microbial clusters with operation time was clearly observed on scanning electron micrographs (SEM). The pressure difference of the membrane module was not over 0.01 mPa over the whole operation period. Present results show that SMBR can be operated efficiently and stably as a high-rate nitrifying technology. 相似文献
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一体化膜生物反应器处理印刷线路板综合废水 总被引:1,自引:0,他引:1
采用自制一体化膜生物反应器(SMBR)处理印刷线路板(PCB)综合废水,对系统驯化过程的污泥生物相变化,SV30(污泥沉降比)、SVI(污泥沉降指数),MLSS(混合液悬浮固体浓度)、MLVSS(混合液挥发性悬浮固体浓度)等污泥特性,以及系统pH,铜离子浓度、化学耗氧量(COD)等水质指标进行了监测.试验结果表明:污泥培养驯化过程中,游泳型纤毛虫、固着型纤毛虫(累枝虫、钟虫)、轮虫、红斑顠体虫、表壳虫、固着型纤毛虫交替成为优势种群.进水铜离子质量浓度为12 mg/L左右驯化完成,此时污泥MLSS为6 100 mg/L,SV30为29%~38.5%,SVI为75~90 mL/g.系统出水COD、铜离子浓度和pH均达广东省水污染物排放限值一级标准,COD和铜离子的去除率分别超过85%和95%. 相似文献
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Studies on anaerobic membrane bioreactor (AMBR) show high variability about filterability. Therefore, in this study, a laboratory-scale submerged AMBR (SAMBR) was operated with the aim of identifying operational conditions and sludge characteristics that influence the membrane flux. Short-term experiments applying the flux-step method resulted in values of the critical flux (Jc) variable depending on the operational condition applied in the SAMBR. The application of different parameters for the identification of Jc gave comparable results. Although the plant was operated applying different operational conditions, a rapid membrane fouling was usually observed. The applicable fluxes were between 2 and 5 L/(m2 h) depending on operational conditions. Therefore, the results confirm the much lower sludge filterability in anaerobic than aerobic MBRs. Multiple regression analysis showed that the supernatant composition plays the most important role in membrane fouling. 相似文献
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《Desalination》2007,202(1-3):411-417
One of the most crucial and difficult elements of the bioprocess is its ability to separate between the biosolids and the liquid effluent phase. The objectives of this study were to evaluate practical possibilities to upgrade existing wastewater treatment facilities by operating aerobic treatment based on MBR technology, in order to obtain high quality effluent for sustainable reclamation and reuse of industrial wastewater. Three different types of industrial wastewaters have been biologically treated by MBR working on hollow fiber technology: (a) paper mill; (b) food production; (c) fuel port facilities. The MBR received preliminarily treated effluent by anaerobic, chemical and physical processes, respectively. The experimental work in this study indicated that biological treatment of industrial wastewater containing contaminants characterized by hydrophobicity and/or by low biodegradability would require the adaptation of the MBR operation conditions, by lowering cell residence time and MLVSS in the bioreactor and by increasing the amounts of excess biosolids accordingly. The effluent was of high quality and could be considered for reuse in paper mill and food production. 相似文献
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The microbial community structure in an intermittently aerated submerged membrane bioreactor treating domestic wastewater was investigated using the respiratory quinone profiling method. The operating cycle consisted of feeding the domestic wastewater into a 90-min oxic condition and a 60-min anoxic condition. A slight difference was observed in the microbial community structure of the suspended microorganisms in anoxic and oxic conditions. The dominant quinone type of anoxic and oxic conditions was ubiquinone (UQ)-8 followed by UQ-10 and menaquinone (MK)-6. The quinone profiles of the suspended microorganisms in the intermittently aerated SMBR with anoxic and oxic cycling showed that Nitrosomonas species, Alcaligenes species, and Thiobacillus, the dominant quinone of there are UQ-8 actively contributed to the biological nitrification/denitrification. The microbial diversities of suspended microorganisms in the anoxic and oxic conditions calculated on the molar fraction basis of all quinone compositions were 8.79-10.38 and 10.03-11.82, respectively. 相似文献
10.
Viability of microbial mass in a submerged membrane bioreactor 总被引:10,自引:0,他引:10
In this study the viability of biomass in a submerged membrane activated sludge system (sMBR) which treats domestic wastewater was investigated by dealing with non-biodegradable COD, specific oxygen uptake rate and MLVSS during operation for 100 days. It was shown that the viability of biomass in the bioreactor was reduced at the 50% level because of the accumulation of inert compounds and the reduction in the activities of poor biomass. After inoculating the bioreactor again, the specific OUR increased because of young biomass entering into the bioreactor. It was shown that there was an exponential relationship between OUR and MLVSS and there was a logarithmic relationship between specific OUR and MLVSS. 相似文献
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Carolina Fonseca Couto Larissa Silva Marques Míriam Cristina Santos Amaral 《分离科学与技术》2017,52(13):2150-2160
This work investigates the application of a microfiltration–membrane bioreactor–nanofiltration hybrid process for textile effluent reclamation. The indigo blue dye was efficiently retained by the microfiltration membrane (100%), which allows its recovery from the concentrate stream. The membrane bioreactor resulted in chemical oxygen demand (COD) and ammonia removal of 73% and 100%, respectively. Nanofiltration technology was successfully applied to polish textile effluent. The principal cause of flux decline was determined to be concentration polarization. The nanofiltration permeate meets the quality requirements for all processes within the textile industry, while the nanofiltration concentrate can be used for less demanding purposes. 相似文献
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Removal of nitrogen from wastewater for reusing to boiler feed-water by an anaerobic/aerobic/membrane bioreactor 总被引:1,自引:0,他引:1
Hongbo Liu Changzhu Yang Wenhong Pu Jingdong Zhang 《Chemical engineering journal (Lausanne, Switzerland : 1996)》2008,140(1-3):122-129
The innovative process anaerobic/aerobic/membrane bioreactor (A/O/MBR) was developed to enhance pre-denitrification without the energy consumption of the recirculation pump for reusing wastewater to boiler feed-water. The performance of this bioreactor was investigated. Firstly, the septic tank wastewater with low ratio of COD/TN was disposed by a dynamic membrane bioreactor (DMBR). It was found that, although the high concentration of NO2−–N in the effluent implied the potential ability of DMBR to realize shortcut nitrification and denitrification, the effluent of single DMBR was difficult to reach the criteria of reusing to boiler feed-water. Then, the process A/O/DMBR in disposing the septic tank wastewater was studied. The results indicated that this process not only accomplished the removal of 91.5% COD, 90.3% NH4+–N and 60.2% TN, but also successfully realized pre-denitrification without additional recirculation pump. At last, based on the A/O/DMBR, a pilot plant A/O/MBR was built to dispose the municipal raw sewage. In the stable operation period, the average removal efficiencies for COD, NH4+–N, TP and turbidity reached 90%, 95%, 70% and 99%, respectively. During the tested HRT run of 9.0 h, the effluent of COD, NH4+–N, TP and turbidity was about 10 mg/L, 3 mg/L, below 1 mg/L and 1.2 NTU, respectively, which reached the criteria of the boiler feed-water in China. 相似文献
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Dyeing and printing wastewater treatment using a membrane bioreactor with a gravity drain 总被引:7,自引:0,他引:7
A laboratory-scale membrane bioreactor (MBR) with a gravity drain was tested for dyeing and printing wastewater treatment from a wool mill. The MBR was operated with continuous permeate by gravity and without chemical cleaning for 135 days. Results showed that excellent effluent quality could meet the reuse water standard in China. The average concentrations of COD, BOD5, turbidity and color in the effluent were 36.9 mg l−1, 3.7 mg l−1, 0.2 NTU and 21 dilution times (DT), respectively. The average removal rates of COD, BOD5, turbidity and color were 80.3%, 95.0%, 99.3% and 58.7%, respectively. The membrane flux increased with increasing of aeration intensity, and its increasing rate was related to pressure-heads. The higher the pressure-head, the greater the impact of aeration intensity on membrane flux. Statistical analysis also showed that both the pressure-head and aeration intensity significantly affected membrane flux. Due to its compact design, simple operation and easy maintenance, MBR with a gravitational filtration system hs low energy consumption and is cost-effective to build and operate. If the life expectancy of the membrane is set for 3–4 years and the membrane flux is set at 15 l/m2·h, such a MBR would be very competitive. 相似文献
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《Desalination》2007,202(1-3):343-350
The integrated system with microfiltration/electrodialysis was proposed for wastewater reclamation. The filterability of metal membrane, membrane fouling reduction by ozonated water and the effect of operational parameters were experimentally investigated. Backwashing by ozonated water showed stable and effective membrane fouling reduction. The removal ratio of nutrients such as NH4+-N and PO43−-P concentration was about 96 and 94%, respectively, within 30 min of operation in the system. Proposed system showed good rejections on bacteria, suspended solids as well as ionic nutrients. Suggested wastewater reclamation system showed stable water quality during operational period over 6 months. Therefore, it is expected to be an effective and useful system for the reclamation of wastewater. 相似文献
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A. Huelgas 《Desalination》2010,250(1):162-166
Graywater treatment has been the focus when topics of decentralized treatment systems are discussed. In this paper, the treatment of higher-load graywater, a mixture of washing machine and kitchen sink wastewater, was investigated. A 10 L lab-scale submerged membrane bioreactor (subMBR) was operated with a flat-plate membrane for 87 days. Permeate was intermittently withdrawn at constant transmembrane pressure (TMP) induced by water level difference and without pump requirement. The pollutants' removal and membrane behavior were monitored. The COD removal was around 96% and a permeate COD of about 26 mg L− 1 was obtained. The total linear alkylbenzene sulfonate (LAS) removal achieved was > 99%, indicative of its non-inhibited degradation even at influent concentration of 30.8 mg L− 1. The subMBR was operated at almost stable and constant flux of 0.22 m3 m− 2 d− 1 at a mean HRT of 13.6 h. 相似文献
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采用动态膜生物反应器(dynamic membrane bioreactor,DMBR)和膜生物反应器(membrane bioreactor,MBR)两种处理工艺,研究在相同条件下对养殖废水的处理效果和运行条件。结果表明,不同溶解氧(dissolve oxygen,DO)条件下,DMBR和MBR对CODMn的去除率可达95%以上。DO为0~1 mg/L条件下,DMBR和MBR的总氮平均去除率分别达到71.4%、75.8%;在DO为2~3 mg/L条件下,DMBR和MBR的总氮平均去除率分别为46.3%、44.1%。DMBR和MBR两种工艺均能达到较好的污染物去除效果。MBR的过滤压差明显高于DMBR,低DO条件下(0~1 mg/L)的运行周期约为5天,DMBR采用重力流出水,运行周期约为10天,过滤压差最高时仅为3.97 kPa,在一定程度上克服MBR成本高、易污染等缺点。 相似文献
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As a service to readers who understand German, French or Spanish better than English, the abstract for the research article in this issue follow in these languages. 相似文献