The effect of mixed liquor suspended solids (MLSS) on biofouling in a hybrid membrane bioreactor for the treatment of high concentration organic wastewater

2011 ◽  
Vol 63 (8) ◽  
pp. 1701-1706 ◽  
Author(s):  
A. Damayanti ◽  
Z. Ujang ◽  
M. R. Salim ◽  
G. Olsson
Keyword(s):  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Loading Rate ◽  
Removal Rate ◽  
Transmembrane Pressure ◽  
High Concentration ◽  
Critical Flux ◽  
Mixed Liquor ◽  
Palm Oil Mill ◽  
Volumetric Loading

Biofouling is a crucial factor in membrane bioreactor (MBR) applications, particularly for high organic loading operations. This paper reports a study on biofouling in an MBR to establish a relationship between critical flux, Jc, mixed liquor suspended solids (MLSS) (ranging from 5 to 20 g L−1) and volumetric loading rate (6.3 kg COD m−3 h−1) of palm oil mill effluent (POME). A lab-scale 100 L hybrid MBR consisting of anaerobic, anoxic, and aerobic reactors was used with flat sheet microfiltration (MF) submerged in the aerobic compartment. The food-to-microorganism (F/M) ratio was maintained at 0.18 kg COD kg−1 MLSSd−1. The biofouling tendency of the membrane was obtained based on the flux against the transmembrane pressure (TMP) behaviour. The critical flux is sensitive to the MLSS. At the MLSS 20 g L−1 the critical flux is about four times lower than that for the MLSS concentration of 5 g L−1. The results showed high removal efficiency of denitrification and nitrification up to 97% at the MLSS concentration 20 g L−1. The results show that the operation has to compromise between a high and a low MLSS concentration. The former will favour a higher removal rate, while the latter will favour a higher critical flux.

Experiment of Polyester Wastewater Treatment by Aerobic Membrane Bioreactor and an Engineering Application

2012 ◽  
Vol 518-523 ◽  
pp. 2130-2137
Author(s):  
Si Hao Lv ◽  
Hui Chang ◽  
Zhi Hui Liang ◽  
Yan Yan Zeng ◽  
Hong Bo Fan
Keyword(s):  
Water Quality ◽  
Pilot Study ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Loading Rate ◽  
Engineering Application ◽  
Full Scale ◽  
Effluent Water ◽  
Small Influence ◽  
Volumetric Loading

A pilot study was carried out to evaluate the application of aerobic submerged MBR in treating polyester wastewater and a full scale system in which MBR was adopted as the key aspect was put forward to treat the polyester wastewater of Zhuhai Yuhua Polyester co., Ltd., China. The pilot study revealed that HRT could be affected by the influent COD, and a HRT larger than 36h was proposed for treating polyester wastewater by MBR. Volumetric loading rate and sludge loading rate ranged in 0.7-2.0 kgCOD/m3•d and 0.09~0.24 kgCOD/ kgMLSS•d respectively were of small influence on the COD removal. DO in the range of 2.5-4.0 mg/L seemed to be optimal for avoiding limitations due to oxygen concentration and creating an effective turbulence. The modified full scale system which includes anaerobic digesting tank and MBR followed by a stabilization pond was verified to be effective to treat the polyester wastewater in the latest two years. The results illustrated that the effluent water quality could meet the discharge limits of water pollutants (DB 44/26-2001) which was established in Guangdong, China. Observed sludge yield of the system fluctuated between 0.10-0.18 gMLSS/gCOD and averaged at 0.137 gMLSS/gCOD. The membrane permeate at around 10 L/m2h, TMP of less than 0.7bar, and total mixed liquor suspended solids (MLSS) between 6-7g/L were suitable to operate the MBR.

scholarly journals Effect of Mixed Liquor Volatile Suspended Solids on Membrane Fouling During Short and long-term Operation of Membrane Bioreactor

2015 ◽  
Vol 11 (21) ◽  
pp. 137-155 ◽  
Author(s):  
Edson Baltazar Estrada-Arriaga ◽  
Petia Mijaylova Nacheva ◽  
Liliana García-Sánchez
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Membrane Surface ◽  
Waste Water Treatment ◽  
Critical Flux ◽  
Term Operation ◽  
Mixed Liquor ◽  
Submerged Membrane Bioreactor ◽  
The Impact

The aim of this study was to examine the impact of different Mixed Liquor Volatile Suspended Solids (MLVSS) concentrations on membrane fouling,in a submerged Membrane Bioreactor (MBR) at short and longterm MBRoperation for waste water treatment. Three laboratory-scale in a submerged MBR system were operated under critical flux, subcritical flux,and an intermittent suction time and backwashing conditions. At short-term MBR operation with mixed liquors of 4,200 and 6,150 mg MLVSSL−1, the hydraulic resistance of membranes followed a same trajectory with averages of 5.0E+12m−1, whereas for 7,940 mg MLVSSL−1, a highresistance of up to 1.7E+13m−1was obtained. The result showed thathigh biomass concentrations decreased to permeability due to a bio-layer formed in the membrane surface and high Extracellular Polymeric Substance (EPS).

Combined UASB reactor and DAF/BF/anoxic/aerobic process for the removal of high-concentration organic matter and nutrients from slurry-type swine waste

2004 ◽  
Vol 49 (5-6) ◽  
pp. 199-205 ◽  
Author(s):  
B.U. Kim ◽  
C.H. Won ◽  
J.M. Rim
Keyword(s):  
Loading Rate ◽  
Removal Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Swine Waste ◽  
High Concentration ◽  
Dissolved Air Flotation ◽  
Volumetric Loading ◽  
Anaerobic Sludge Blanket ◽  
Dissolved Air

This research aimed to effectively remove high-concentration organic matter and nutrients from slurry-type swine waste using a combined upflow anaerobic sludge blanket reactor with the dissolved air flotation/aerobic submerged biofilm/anoxic/aerobic process. The upflow anaerobic sludge blanket reactor was operated at an organics volumetric loading rate of 3.2Ð6.1 kg COD/m3/day, and the removal rates of COD were 53.9-65.5%. The removal rate of COD of the overall process was more than 99%. In the aerobic submerged biofilm, over 95% of ammonium nitrogen was removed at a volumetric loading rate of 0.08-0.16 kg NH4+-N/m3/day. The specific denitrification rate was 0.257 g NO3-N/g MLVSS/day and the removal rate of total nitrogen was 86.7%. Phosphorus was removed by flocculation in the dissolved air flotation process, and 0.16 g of PO4-P was removed by 1 g of ferric ion.

Ammonium Removal by the Oxygen-Limited Autotrophic Nitrification-Denitrification System

1998 ◽  
Vol 64 (11) ◽  
pp. 4500-4506 ◽  
Author(s):  
Linping Kuai ◽  
Willy Verstraete
Keyword(s):  
Suspended Solids ◽  
Loading Rate ◽  
Removal Rate ◽  
Batch Reactor ◽  
Synthetic Wastewater ◽  
Hydroxylamine Oxidoreductase ◽  
Autotrophic Nitrification ◽  
One Step ◽  
Related Enzyme ◽  
Volumetric Loading

ABSTRACT The present lab-scale research reveals the potential of implementation of an oxygen-limited autotrophic nitrification-denitrification (OLAND) system with normal nitrifying sludge as the biocatalyst for the removal of nitrogen from nitrogen-rich wastewater in one step. In a sequential batch reactor, synthetic wastewater containing 1 g of NH4 +-N liter−1 and minerals was treated. Oxygen supply to the reactor was double-controlled with a pH controller and a timer. At a volumetric loading rate (Bv ) of 0.13 g of NH4 +-N liter−1 day−1, about 22% of the fed NH4 +-N was converted to NO2 −-N or NO3 −-N, 38% remained as NH4 +-N, and the other 40% was removed mainly as N2. The specific removal rate of nitrogen was on the order of 50 mg of N liter−1 day−1, corresponding to 16 mg of N g of volatile suspended solids−1 day−1. The microorganisms which catalyzed the OLAND process are assumed to be normal nitrifiers dominated by ammonium oxidizers. The loss of nitrogen in the OLAND system is presumed to occur via the oxidation of NH4 + to N2 with NO2 − as the electron acceptor. Hydroxylamine stimulated the removal of NH4 + and NO2 −. Hydroxylamine oxidoreductase (HAO) or an HAO-related enzyme might be responsible for the loss of nitrogen.

Critical Review on the Effects of Mixed Liquor Suspended Solids on Membrane Bioreactor Operation

2006 ◽  
Vol 41 (7) ◽  
pp. 1489-1511 ◽  
Author(s):  
Alex O. Schwarz ◽  
Bruce E. Rittmann ◽  
George V. Crawford ◽  
Angela M. Klein ◽  
Glen T. Daigger
Keyword(s):  
Critical Review ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Mixed Liquor ◽  
Bioreactor Operation

Effects of Mixed Liquor Suspended Solids on Membrane Bioreactor Operation

ChemInform ◽  
2006 ◽  
Vol 37 (41) ◽  
Author(s):  
Alex O. Schwarz ◽  
Bruce E. Rittmann ◽  
George V. Crawford ◽  
Angela M. Klein ◽  
Glen T. Daigger
Keyword(s):  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Mixed Liquor ◽  
Bioreactor Operation

scholarly journals Fouling Behavior in a High-Rate Anaerobic Submerged Membrane Bioreactor (AnMBR) for Palm Oil Mill Effluent (POME) Treatment

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 649
Author(s):  
Wiparat Chaipetch ◽  
Arisa Jaiyu ◽  
Panitan Jutaporn ◽  
Marc Heran ◽  
Watsa Khongnakorn
Keyword(s):  
Palm Oil ◽  
Membrane Bioreactor ◽  
Operation Time ◽  
Laser Scanning Microscopy ◽  
High Rate ◽  
Palm Oil Mill Effluent ◽  
Hydroxyl Group ◽  
Transmembrane Pressure ◽  
Cake Layer ◽  
Palm Oil Mill

The characteristics of foulant in the cake layer and bulk suspended solids of a 10 L submerged anaerobic membrane bioreactor (AnMBR) used for treatment of palm oil mill effluent (POME) were investigated in this study. Three different organic loading rates (OLRs) were applied with prolonged sludge retention time throughout a long operation time (270 days). The organic foulant was characterized by biomass concentration and concentration of extracellular polymeric substances (EPS). The thicknesses of the cake layer and foulant were analyzed by confocal laser scanning microscopy and Fourier transform infrared spectroscopy. The membrane morphology and inorganic elements were analyzed by field emission scanning electron microscope coupled with energy dispersive X-ray spectrometer. Roughness of membrane was analyzed by atomic force microscopy. The results showed that the formation and accumulation of protein EPS in the cake layer was the key contributor to most of the fouling. The transmembrane pressure evolution showed that attachment, adsorption, and entrapment of protein EPS occurred in the membrane pores. In addition, the hydrophilic charge of proteins and polysaccharides influenced the adsorption mechanism. The composition of the feed (including hydroxyl group and fatty acid compounds) and microbial metabolic products (protein) significantly affected membrane fouling in the high-rate operation.

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