Juni 2010 , Hal . 1-9 MEMBRANE BIOREACTOR FOR TREATMENT OF RECALCITRANT WASTEWATERS (original) (raw)
Related papers
Membrane Bioreactor for Treatment of Recalcitrant Wastewaters
Reaktor, 2010
The low biodegradable wastewaters remain a challenge in wastewater treatment technology. The performance of membrane bioreactor systems with submerged hollow fiber micro-and ultrafiltration membrane modules were examined for purifying recalcitrant wastewaters of leachate of a municipal solid waste open dumping site and effluent of pulp and paper mill. The use of MF and UF membrane bioreactor systems showed an efficient treatment for both types wastewaters with COD reduction of 80-90%. The membrane process achieved the desirable effects of maintaining reasonably high biomass concentration and long sludge retention time, while producing a colloid or particle free effluent. For pulp and paper mill effluent a specific sludge production of 0.11 kg MLSS/kg COD removed was achieved. A permeate flux of about 5 L/m²h could be achieved with the submerged microfiltration membrane. Experiments using ultrafiltration membrane produced relatively low permeate fluxes of 2 L/m²h. By applying periodical backwash, the flux could be improved significantly. It was indicated that the particle or colloid deposition on membrane surface was suppressed by backwash, but reformation of deposit was not effectively be prevented by shear-rate effect of aeration. Particle and colloid started to accumulate soon after backwash. Construction of membrane module and operation mode played a critical role in achieving the effectiveness of aeration in minimizing deposit formation on the membrane surface.
Municipal Wastewater Treatment Using a Hollow Fiber Membrane Bioreactor
A bioreactor equipped with hollow fiber microfiltration membranes was applied for wastewater treatment. Removal of chemical oxygen demand (COD) and biochemical oxygen demand (BOD 5) was investigated. The experimental setup consisted of influent and effluent tanks, and membrane modules using Polyvinyl Di–Fluoride (PVDF) hollow fibers. The operation program included suction and backwash steps which were lasted three and one minutes, respectively. The performance of MBR was monitored for a period of 120 days. The average removal for COD and BOD 5 was over 99.5% and 88.9%, respectively. Results indicated that the MBR system can be applied to treat high–strength waste-waters. Also, it may have sustainable performance during the quantity fluctuations of influent wastewater.
Evaluation of hollow fiber membrane bioreactor efficiency for municipal wastewater treatment
Iranian Journal of Environmental Health Science & Engineering, 2008
The membrane bioreactor technology has been proven to be a single step process in efficient treatment ofwastewater, either directly or after pretreatment by reverse osmosis. In this study, a pilot scale experimentwas studied to treat a synthetic municipal wastewater sample. The aerobic reactor with a submergedmembrane used in this work was continuously aerated for organic matter oxidation, nitrification andphosphorous uptake as well as for fouling control. The mixed liquor was recycled from the aerated zoneto the ...
Membrane bioreactor study for reclamation of mixed sewage mostly from industrial sources
Separation and Purification Technology, 2007
MBR can produce consistently high quality effluent from municipal wastewater and a successful pilot study has already demonstrated advantages of the MBR process for reclaiming the domestic sewage in Singapore. However, a mixed sewage mostly from industrial sources (60% industrial waste and 40% domestic waste) poses a challenge for MBR application. The objective of this study was to determine the feasibility of reclaiming such a mixed sewage using a submerged MBR. A process of anoxic reaction-aerobic reaction-membrane filtration with submerged PVDF hollow fibre modules was used in the study. The MBR process was evaluated over 3 months. The pilot results indicated that HRT of 15 h in MBR might be required for treating the mixed sewage and a membrane flux of 17 LMH was sustainable in the MBR process. The MBR process demonstrated the improved product quality in terms of NH 4 and COD compared to the process of conventional activated sludge treatment-ultrafiltration. The study concluded the MBR process was capable of producing water suitable for industrial use from the mixed sewage.
An Experimental study on Sewage treatment using Membrane BioReactors
Water is becoming an increasingly scarce resource and planners are forced to consider any source of water which might be used economically and effectively to promote further development. The total supply of freshwater on earth far exceeds human demand hence the value of wastewater is becoming increasingly understood. Many arid and semi-arid countries are now looking forward to ways of improving and expanding wastewater reuse practices. The membrane bioreactor technology has become more popular, abundant and accepted in recent years for the treatment of many types of wastewater where the conventional activated sludge process cannot cope with either composition of wastewater or fluctuations of wastewater flow rate. The membrane component uses low pressure microfiltration or ultra-filtration membranes and eliminates the need for clarification and tertiary filtration. The membranes are typically immersed in the aeration tank; however, some applications utilize a separate membrane tank. ...
Desalination, 2008
The use of a submerged membrane bioreactor for the treatment of industrial oil contaminated wastewater was investigated using microfiltration hollow fibre membranes. The membrane bioreactor worked with a hydrocarbon concentration ranging from 600 to 1500 mg/L in a sub-critical flux regime. The sludge concentration ranged from 14 g/L to 28 g/L. During the long-term bioreactor test, three further different membrane modules were tested in order to assess their critical flux in comparable conditions. The membranes investigated were different in materials, pore structure and size. The membranes with larger pore size showed a higher tendency to irreversible fouling. The MBR was able to treat wastewater with high removal efficiency (about 98%), low hydraulic retention time (about 10 h) and high biomass concentration.
Membrane Bioreactor (MBR) as an Advanced Wastewater Treatment Technology
The development and application of a membrane bioreactor (MBR) for full-scale municipal wastewater treatment is the most important recent technological advance in terms of biological wastewater treatment. The MBR is a suspended growth-activated sludge system that utilizes microporous membranes for solid/liquid separation instead of secondary clarifiers. It represents a decisive step forward concerning effluent quality by delivering a hygienically pure effluent and by exhibiting a very high operational reliability. Advanced MBR wastewater treatment technology is being successfully applied at an ever-increasing number of locations around the world. In this chapter, the authors have covered several aspects of MBR, with an exhaustive overview of its operational and biological performance. Different configurations and hydraulics of MBR are presented, with attention given to the fouling phenomenon and strategies for reducing it. Also, the high quality of MBR effluent is discussed, whereas in comparison with CAS removals of organic matter, ammonia, phosphorus, solids, bacteria and viruses are significantly enhanced. Emphasis has been given to the improved capability of MBR to remove organic contaminants present at trace concentration levels (ng L−1, μg L−1 and mg L−1), which to the authors' knowledge represents a first attempt to summarize the published literature on this subject. Finally, advantages and disadvantages of MBR over CAS are concerned. In conclusion, MBR represents an efficient and cost-effective process that copes excellently with the growing needs for transforming wastewater into clean water that can be returned to the hydrological cycle without detrimental effects.
Desalination, 2006
Experimental studies were conducted to investigate the performance and filtration characteristics of a submerged non-woven membrane bioreactor system. The results showed that an activated sludge system with a submerged tubular non-woven membrane module could be operated until the mixed liquor suspended solid (MLSS) reached about 11,000 mg/L. In studying the filtration characteristics of our submerged non-woven membrane bioreactor system, the factors under investigating included pore size, initial flux, aeration intensity and MLSS effect. It was found that suspended floc particles of activated sludge were the main contributor for membrane fouling. The filtration behaviors of the submerged non-woven membrane bioreactor system were different from those of conventional microporous membrane bioreactor systems, especially operating at high aeration intensity and high MLSS concentration.
Bioresource Technology, 2011
The aim of this study was to assess the effect of several operational variables on both biological and separation process performance in a submerged anaerobic membrane bioreactor pilot plant that treats urban wastewater. The pilot plant is equipped with two industrial hollow-fibre ultrafiltration membrane modules (PURON Ò Koch Membrane Systems, 30 m 2 of filtration surface each). It was operated under mesophilic conditions (at 33°C), 70 days of SRT, and variable HRT ranging from 20 to 6 h. The effects of the influent COD/SO 4 -S ratio (ranging from 2 to 12) and the MLTS concentration (ranging from 6 to 22 g L À1 ) were also analysed. The main performance results were about 87% of COD removal, effluent VFA below 20 mg L À1 and biogas methane concentrations over 55% v/v. Methane yield was strongly affected by the influent COD/SO 4 -S ratio. No irreversible fouling problems were detected, even for MLTS concentrations above 22 g L À1 .
Performance of an ultrafiltration membrane bioreactor (UF-MBR) in wastewater treatment
DESALINATION AND WATER TREATMENT, 2019
This work presents the performance of an ultrafiltration membrane bioreactor (UF-MBR) system used as a means of removing pollution from domestic wastewater. Considering the technical performances of the process under different operational conditions, influence of hydraulic retention time (HRT), aeration rate and transmembrane pressure were observed. The evaluation of permeate quality, calculated by the removal efficiencies for various water quality indicators: chemical oxygen demand, biological oxygen demand, total suspended solids, total nitrogen (TN) and total phosphorous (TP). The best results obtained on the system (pressure p = 1.27 bar), HRT (15 h) showed removal efficiencies up to 90% in terms of organic compounds removal, 100% in terms of suspended solids presence and up to 80% reduction of TN and TP. The overall results suggest that the performance of the UF-MBR are likely to impact on the operation and maintenance of the system. However, the MBR process might be successfully applied as a treatment for the removal of pollution from domestic wastewater.