Comparison of Submerged Membrane Bioreactor in Different SRT Conditions

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
S.L. Khor ◽  
D.D. Sun ◽  
C.T. Hay ◽  
J.O. Leckie
Keyword(s):  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Innovative Technology ◽  
Organic Degradation ◽  
Submerged Membrane Bioreactor ◽  
Sludge Disposal ◽  
Organic Removal ◽  
High Degree ◽  
Disposal Cost

Complete sludge retention MBR appears to be an innovative technology which no sludge will be produced, hence eliminating the sludge disposal cost. However, the understanding of microbial behaviour in the complete sludge retention MBR was still not adequately established. This study was conducted to investigate the biological performances and microbial behaviour of three different SRT MBRs (5 days SRT, 10 days SRT and prolonged SRT). The results revealed that membrane filtration assisted for maintaining the high degree of organic removal (above 97%) for all MBRs. High organic degradation was noticed in the prolonged SRT MBR (89.44%) compared with 5 days SRT (77.64%) and 10 days SRT (85.62%) MBRs. This showed that the prolonged SRT MBR posed a greater capability for further degradation of inert organics and SMP. Extremely low sludge yield (0.0388 g VSS/g COD) was occurred in the prolonged SRT condition compared with 5 and 10 days SRT conditions. The low SOUR did not affect the degradation performance. Whereas, it implied that small amount of oxygen was sufficient to achieve high degree of organic degradation during the prolonged SRT MBR condition.

Effect of 200 days' sludge retention time on performance of a pilot scale submerged membrane bioreactor for high strength industrial wastewater treatment

2006 ◽  
Vol 53 (11) ◽  
pp. 269-276 ◽  
Author(s):  
C.T. Hay ◽  
D.D. Sun ◽  
S.L. Khor ◽  
J.O. Leckie
Keyword(s):  
Retention Time ◽  
Industrial Wastewater ◽  
Membrane Bioreactor ◽  
Hydraulic Retention Time ◽  
High Strength ◽  
Pilot Scale ◽  
Submerged Membrane Bioreactor ◽  
Sludge Retention Time ◽  
Organic Removal ◽  
Sludge Concentration

A high strength industrial wastewater was treated using a pilot scale submerged membrane bioreactor (MBR) at a sludge retention time (SRT) of 200 d. The MBR was operated at a high sludge concentration of 20 g/L and a low F/M ratio of 0.11 during 300 d of operation. It was found that the MBR could achieve COD and TOC overall removal efficiencies at more than 99 and 98% TN removal. The turbidity of the permeate was consistently in the range of 0.123 to 0.136 NTU and colour254 absorbance readings varied from 0.0912 to 0.0962 a.u. cm−1. The sludge concentration was inversely proportional to the hydraulic retention time (HRT), yielded excellent organic removal and extremely low sludge production (0.0016 kgVSS/day).

The First Two Years of Full-Scale Anaerobic Membrane Bioreactor (AnMBR) Operation Treating High-Strength Industrial Wastewater

2011 ◽  
Vol 6 (2) ◽  
Author(s):  
Scott Christian ◽  
Shannon Grant ◽  
Peter McCarthy ◽  
Dwain Wilson ◽  
Dale Mills
Keyword(s):  
Industrial Wastewater ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
High Strength ◽  
System Capacity ◽  
Superior Performance ◽  
Organic Load ◽  
Design Parameters ◽  
Innovative Technology ◽  
Anaerobic Membrane Bioreactor

The anaerobic membrane bioreactor (AnMBR) incorporates anaerobic digestion and membrane filtration in one process to form an innovative technology for treating high-strength industrial wastewater. The first AnMBR installation in North America, also known as the largest AnMBR installation in the world, was built at Ken's Foods in Massachusetts, USA. Ken's Foods existing anaerobic process was upgraded to AnMBR in July 2008 to treat raw wastewater from the production of salad dressings and barbeque sauces. The system was converted to AnMBR due to lack of space, positive economics, and the ability to provide additional capacity for flow and organic load beyond the original anaerobic system design parameters. This AnMBR system has a design influent flow rate of 475 m3/d with 39,000 mg/l COD, 18,000 mg/l BOD, and 12,000 mg/l TSS. The AnMBR system consistently produces a high quality effluent with non-detectable TSS concentrations and average COD and BOD concentrations of 210 and 20 mg/l, with removals of 99.4 and 99.9 percent, respectively. The AnMBR system provides superior performance and a very low rate of membrane fouling with the aid of biogas scour across the membrane surface. The first 20 months of AnMBR operating expenses were reduced by 50 compared to the prior 12-month fiscal period due to increased system capacity, ability to treat wastewater with higher biomass, and elimination of the need to dewater and dispose of dewatered solids.

Effect of Modified Diatomite Addition on Sludge Properties for Membrane Fouling Alleviation in Submerged Membrane Bioreactor

2011 ◽  
Vol 233-235 ◽  
pp. 680-683
Author(s):  
Shuo Liu ◽  
Yan Ping Liu ◽  
Bao Zhen Wang ◽  
Ji Fu Wang
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Submerged Membrane Bioreactor ◽  
Sludge Properties ◽  
Sludge Particle ◽  
Modified Diatomite

To alleviate the membrane fouling in membrane bioreactor, a kind of modified diatomite was used as anti-fouling agent to examine the effect on sludge properties in submerged membrane bioreactor for synthetic domestic wastewater treatment. Three submerged membrane bioreactor setups were operated under fixed membrane flux 21.9m3/m2·h, meanwhile, modified diatomite was added into each membrane bioreactor with dosage of 0mg/L, 1000mg/L and 2000mg/L respectively. Sludge particle size, extracellular polymeric substances and molecular weight distribution were characterized as the activated sludge properties in this study. The experiment results showed that with the increase of modified diatomite dosage, the number of sludge particle size less than 10μm was declined, however, the number between 10–20μm was increased correspondingly. Total extracellular polymeric substances and big molecular weight substances were decreased remarkably with modified diatomite addition dosage of 1000mg/L. The results indicated that addition of modified diatomite could effect of sludge properties in submerged membrane bioreactor. Therefore, membrane filtration performance could be improved by modified diatomite adding which alleviate membrane fouling directly.

A Study on a Submerged Membrane Bioreactor for Municipal Wastewater Treatment

2012 ◽  
Vol 531 ◽  
pp. 415-418 ◽  
Author(s):  
Xu Dong Liu ◽  
Ying Meng Xiu ◽  
Yan Hong Chen
Keyword(s):  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Membrane Pores ◽  
Submerged Membrane Bioreactor ◽  
Solids Concentration ◽  
Long Term Experiment

Through a long-term experiment, the performance of membrane bioreactor(MBR) for contaminants removal and membrane fouling was investigated. The results demonstrated that the removal effect of COD and NH3-N by the MBR was better. The effluent COD and NH3-N were lower than 50mg/L and 4mg/L, respectively. The observation by using the scanning electronic microscope(SEM) presented at the beginning of membrane filtration, there was no fouling in the membrane pores. With the continuous operation of the MBR, foulants shaped like mud cakes appeared in the membrane poles. The increasing of MLSS(mixed liquor suspended solids) concentration in the bioreactor didn’t increase membrane fouling. During the 75 days of operation, MBR cleaning was carried out twice.

Treatment of Coking Wastewater by a Submerged Membrane Bioreactor with Suspended Carriers

2014 ◽  
Vol 1065-1069 ◽  
pp. 3235-3238
Author(s):  
Qi Yuan Gu ◽  
Ming Yue Li
Keyword(s):  
Removal Efficiency ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Operation Time ◽  
Phenol Removal ◽  
Coking Wastewater ◽  
Submerged Membrane Bioreactor ◽  
Biofilm Process ◽  
Suspended Carrier

A renovated hybrid membrane bioreactor (HMBR) was investigated for its capability of coking wastewater treatment. The HMBR combined biofilm process and membrane filtration process. The system was efficient in degrading COD and phenol in coking wastewater and controlling membrane. It was found that the coking wastewater could be effectively treated with 88.6% of COD removal efficiency and 98.3% of phenol removal efficiency at hydraulic retention time (HRT) of 16 h. The removal efficiency of COD and phenol decreased gradually down to 83.2% and 97.7% when HRT decreased to 8 h. The long term experiments indicated that the degree of membrane fouling for HMBR was far lower than that for MBR. The scrubbing effect of suspended carrier in HMBR was observed to be capable of reducing the cake fouling of membrane. The operation time of HMBR was 8.4-fold longer than that with MBR.

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