Effect of high salinity on activated sludge characteristics and membrane permeability in an immersed membrane bioreactor

Reid, Elizabeth; Liu, Xingrong; Judd, Simon

doi:10.1016/j.memsci.2006.06.021

Cited by 197 publications

(98 citation statements)

References 32 publications

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“…Moreover, sludge SOUR decreased, especially within the first two weeks of operation ( Figure 5c). These observations are consistent with previous studies [35,36] and could be attributed to the inhibition of elevated bioreactor salinity on biomass growth and activity. An increase in the osmotic stress could result in the dehydration and plasmolysis of bacterial cells and thus reduce their viability [37].…”

Section: Biomass Characteristicssupporting

confidence: 93%

Evaluating ionic organic draw solutes in osmotic membrane bioreactors for water reuse

Luo

Hai

Price

et al. 2016

Journal of Membrane Science

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The performance of two ionic organic draw solutes, namely sodium acetate (NaOAc) and ethylene-diaminetetra acetic acid disodium salt (EDTA-2Na), during osmotic membrane bioreactor (OMBR) operation was investigated in this study. Their performance was compared to that of sodium chloride (NaCl). A reverse osmosis (RO) process was integrated with OMBR to form an OMBR-RO hybrid system for draw solute recovery and clean water production. Results show that the NaOAc and EDTA-2Na draw solutes significantly reduced salinity build-up in the bioreactor in comparison with NaCl during OMBR operation. At the same osmotic pressure, these two ionic organic draw solutions produced slightly lower water flux, but considerably less reverse salt flux than NaCl. Compared to NaCl and NaOAc, EDTA-2Na resulted in significantly less fouling to the forward osmosis membrane. Regardless of the draw solutes, the OMBR-RO hybrid system could remove all 31 trace organic contaminants investigated in this study by more than 97%. Results reported here suggest that ionic organic draw solutes can be used to mitigate salinity build-up in the bioreactor during OMBR operation. AbstractThe performance of two ionic organic draw solutes, namely sodium acetate (NaOAc) and ethylene-diamine-tetra acetic acid disodium salt (EDTA-2Na), during osmotic membrane bioreactor (OMBR) operation was investigated in this study. Their performance was compared to that of sodium chloride (NaCl). A reverse osmosis (RO) process was integrated with OMBR to form an OMBR-RO hybrid system for draw solute recovery and clean water production. Results show that the NaOAc and EDTA-2Na draw solutes significantly reduced salinity build-up in the bioreactor in comparison with NaCl during OMBR operation. At the same osmotic pressure, these two ionic organic draw solutions produced slightly lower water flux, but considerably less reverse salt flux than NaCl. Compared to NaCl and NaOAc, EDTA-2Na resulted in significantly less fouling to the forward osmosis membrane.Regardless of the draw solutes, the OMBR-RO hybrid system could remove all 31 trace organic contaminants investigated in this study by more than 97%. Results reported here suggest that ionic organic draw solutes can be used to mitigate salinity build-up in the bioreactor during OMBR operation.

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Section: Biomass Characteristicssupporting

confidence: 93%

Evaluating ionic organic draw solutes in osmotic membrane bioreactors for water reuse

Luo

Hai

Price

et al. 2016

Journal of Membrane Science

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“…Then it grew with NaCl addition and reached 0.55 g g -1 MLVSS when the NaCl was 20 g L -1 . This agreed with Reid et al (2006) that high salinity greatly increased EPS content. However, when the NaCl was added further, the EPS content did not increase with enhancing salinity.…”

Section: Impact Of Eps On Granulationsupporting

confidence: 90%

Performance and granulation in an upflow anaerobic sludge blanket (UASB) reactor treating saline sulfate wastewater

et al. 2013

Biodegradation

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An upflow anaerobic sludge blanket reactor was employed to treat saline sulfate wastewater. Mesophilic operation (35 ± 0.5°C) was performed with hydraulic retention time fixed at 16 h. When the salinity was 28 g L -1 , the chemical oxygen demand and sulfate removal efficiencies were 52 and 67 %, respectively. The salinity effect on sulfate removal was less than that on organics removal. The methane productions were 887 and 329 cm 3 L -1 corresponding to the NaCl concentrations of 12 and 28 g L -1 , respectively. High salinity could stimulate microbes to produce more extracellular polymeric substances (EPSs) and granulation could be performed better. Besides, with the high saline surroundings, a great deal of Na ? compressed the colloidal electrical doublelayer, neutralized the negative charge of the sludge particles and decreased their electrostatic repulsion.The repulsion barrier disappeared and coagulation took place. The maximum size of granules was 5 mm, which resulted from the coupled triggering forces of high EPSs and Na ? contents. Sulfate-reducing bacteria (SRB) were dominant in the high saline surroundings while the methane-producing archaea dominated in the low saline surroundings. The SRB were affected least by the salinity.

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“…Earlier study reported that high salinity greatly affected the physical and biochemical properties of activated sludge, and increased EPS concentration (Reid et al, 2006). At first seven weeks, the sulfate content and loading rate in sulfate-reducing stage were about 9175 mg/L and 24 kg/(m 3 ·day), respectively.…”

Section: Formation and Characteristics Of Granulementioning

confidence: 90%

Biological sulfate removal from acrylic fiber manufacturing wastewater using a two-stage UASB reactor

Wang

Luan

et al. 2012

Journal of Environmental Sciences

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Effect of high salinity on activated sludge characteristics and membrane permeability in an immersed membrane bioreactor

Cited by 197 publications

References 32 publications

Evaluating ionic organic draw solutes in osmotic membrane bioreactors for water reuse

Evaluating ionic organic draw solutes in osmotic membrane bioreactors for water reuse

Performance and granulation in an upflow anaerobic sludge blanket (UASB) reactor treating saline sulfate wastewater

Biological sulfate removal from acrylic fiber manufacturing wastewater using a two-stage UASB reactor

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