Effects of the sludge reduction system in MBR on the membrane permeability

Kim, Hyoung-Gun; Jang, Ha Nee; Kim, Hye-Min; Lee, Daesung; Chung, Tae‐Ho

doi:10.1016/j.desal.2009.09.032

Cited by 23 publications

(7 citation statements)

References 11 publications

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“…4 revealed that, higher MLSS concentration could cause faster decrease of permeate flux. Similar results have been reported in previous [6], and the reason may be attributed to: 1) more particles accumulate on the membrane [9], 2) sludge accumulation and thickening occurs in the spaces among the fibres [10], 3) high filtration resistance results from high viscosity [20]. The duration of decreasing of permeate flux from the initial 15 to 10 dm 3 ·m -2 ·h -1 under MLSS of 8 g·dm -3 was nearly twofold higher than that under MLSS of 11.7 g·dm -3 .…”

Section: Effect Of Mlss Concentration On Membrane Permeate Fluxsupporting

confidence: 93%

“…Due to the retention of suspended solids (SS) by membrane, MBR has the advantage of a higher biomass concentration than most CAS processes. Nevertheless, the concentration of biomass could also influence membrane permeability [5,6]. The examination of membrane permeate flux under two different MLSS concentration, i.e.…”

Section: Effect Of Mlss Concentration On Membrane Permeate Fluxmentioning

confidence: 99%

“…The high concentrated biomass might improve colour removal by sludge adsorption [4]. Nevertheless, high concentration of mixed liquor suspended solids (MLSS) has adverse effects on membrane filtration [5,6]. It is generally known that the extending of SRT could reduce surplus sludge production [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on biomass performance of a submerged membrane bioreactor for treating soy sauce wastewater

Liang

et al. 2016

Environ. Protect. Eng.

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A pilot study for investigating a membrane bioreactor (MBR) performance in treating soy sauce wastewater was divided into three stages. At stage 1, the MBR was operated without excess sludge withdrawal, and pollutants removal increased gradually and entered into a pseudo-stable phase eventually along with increasing mixed liquor suspended solid (MLSS). At stage 2, the growth of biomass and removal of pollutants were obviously decreased by lowering temperature. At stage 3, membrane permeate flux and sludge yield under various MLSSs were studied. Additional polishing steps including coagulation and oxidation were validated to be effective to ensure the treated wastewater to meet the discharge limits. SYMBOLS AND SHORTCUTS DOdissolved oxygen, mg·dm -3 HRThydraulic retention time Kd -The endogenous decay rate, d -1 MLSSmixed liquor suspended solids, g·dm -3 Nrs ratio of F/M, gCOD·gMLSS -1 PACpolyaluminium chloride SRTsludge retention time, day SS suspended solids, g·dm -3 TMPtransmembrane pressure, kPa TP total phosphorus, mg·dm -3 Y real sludge yield rate, gMLSS·gCOD -1 Yobs observed sludge yield rate, gMLSS·gCOD -1

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Section: Effect Of Mlss Concentration On Membrane Permeate Fluxsupporting

confidence: 93%

Section: Effect Of Mlss Concentration On Membrane Permeate Fluxmentioning

confidence: 99%

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Investigation on biomass performance of a submerged membrane bioreactor for treating soy sauce wastewater

Liang

et al. 2016

Environ. Protect. Eng.

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“…Consequently, sludge dewatering is obligatory for such treatment plants and accounts for approximately 50%-60% of the total operating cost of the entire wastewater treatment plant (Appels et al, 2008;Rai et al, 2004). Although conventional sludge dewatering techniques such as clarification, gravity thickening are simple, the clarification is difficult to meet stringent regulations for effluent water quality and the sludge retention time is long and an unpleasant odor is emitted in gravity thickening process (Kim et al, 2010;Wang et al, 2008). Furthermore, the high-nutrient-rich centrate obtained from the stabilization of digested sludge increases the influent nitrogen loading by 15%-20% and phosphorus loading by 8% after combining with raw wastewater (Fux et al, 2002;Wild et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Exploring high charge of phosphate as new draw solute in a forward osmosis–membrane distillation hybrid system for concentrating high-nutrient sludge

Nguyen

et al. 2016

Science of The Total Environment

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For the first time, a high charge of phosphate was used as the draw solute in a forward osmosis-membrane distillation (FO-MD) hybrid system for concentrating high-nutrient sludge. A high water flux (12.5L/m(2)h) and a low reverse salt flux (0.84g/m(2)) were simultaneously achieved at pH9 by using 0.1M Na3PO4 as the draw solute and deionized water as the feed solution in the FO process. The specific reverse salt flux of 0.1M Na3PO4 (Js/Jw=0.07g/L) was considerably less than that of 0.1M NaCl (Js/Jw=0.37g/L) because the complexion between Na(+) and HPO4(2-) at pH9 led to the reduction of free Na(+) ions, which subsequently reduced the reverse salt diffusion substantially. Moreover, for a feed solution with an initial sludge concentration of 3500mg/L, the sludge concentration could be concentrated to 19,800 and 22,000mg/L in the pressure-retarded osmosis (PRO) and FO membrane orientations, respectively, after 15h of operation. Four types of MD membranes were selected for draw solution recovery; of these, a polytetrafluoroethylene membrane with a pore size of 0.45μm was the most effective in achieving a high water flux (10.28L/m(2)h) and high salt rejection (approximately 100%) in a diluted Na3PO4 draw solution.

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“…It has been generally accepted that the membrane fouling is due to particle deposition on membrane surface and/or colloidal particle deposition inside membrane pores . These processes are mainly affected by membrane materials, feedwater characteristics, sludge characteristics, and operating conditions (Judd, 2004;Meng et al, 2009;Kim et al, 2010;Cosenza et al, 2013;Mannina and Cosenza, 2013;Estrada-Arriaga, et al, 2015). Among them, sludge characteristics are considered to be directly affected by the feedwater characteristics and operating conditions (i.e., aeration, hydraulic conditions, sludge retention time (SRT), hydraulic retention time (HRT), organic loading rate, and food microorganism ratio (F/M)).…”

Section: Introductionmentioning

confidence: 99%

Membrane fouling behavior and microbial community succession in a submerged membrane bioreactor treating harbor oily wastewater

Wei

2016

J. Zhejiang Univ. Sci. A

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Abstract:A membrane bioreactor (MBR) was established for treating harbor oily wastewater. It showed good removal performance for chemical oxygen demand (COD), oil content, suspended solids (SS), and other pollutants. However, serious membrane fouling occurred. It was recognized that the extracellular polymeric substances (EPS) accumulated on the membrane surface, especially the proteins, were of great importance for the transmembrane pressure (TMP) increment and membrane fouling. The MBR was optimized via improving aeration rate and reducing the ratio of A r /A d (A r and A d are the cross-sectional areas of the riser and the downcomer of the MBR). The increasing rate of TMP was slowed, indicating that the optimization strategy could effectively mitigate membrane fouling. Microbial community evolution was monitored and analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE), cloning, and sequencing of 16S ribosomal ribonucleic acid (rRNA) fragments. Results revealed that low community shift occurred during the whole operational period. Geobacter sp. and Rhodocyclales sp., which have also been identified by other studies in a petroleum refinery wastewater MBR or an infiltration basin receiving highway runoff, dominated in the MBR system throughout. Comamonas sp. was thought to accommodate the lower aeration rate in this study, while Rhodocyclales sp. preferred the higher aeration rate. In addition, during the operational time under high organic loading rate, a few species were present in abundance, and may have been responsible for the good removal performance at this time.

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Effects of the sludge reduction system in MBR on the membrane permeability

Cited by 23 publications

References 11 publications

Investigation on biomass performance of a submerged membrane bioreactor for treating soy sauce wastewater

Investigation on biomass performance of a submerged membrane bioreactor for treating soy sauce wastewater

Exploring high charge of phosphate as new draw solute in a forward osmosis–membrane distillation hybrid system for concentrating high-nutrient sludge

Membrane fouling behavior and microbial community succession in a submerged membrane bioreactor treating harbor oily wastewater

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