Effect of temperature on membrane bioreactor performance working with high hydraulic and sludge retention time

Arévalo, Juan Carlos; Ruíz, L.M.; Pérez, J. M.; Gómez, M.A.

doi:10.1016/j.bej.2014.03.006

Cited by 50 publications

(10 citation statements)

References 27 publications

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“…The DOC and TN removal efficiencies were consistently high (≥90%) in both seasons. The results were consistent with a previous study which found that seasonal variations did not affect the COD concentration within the MBR permeate (Arevalo et al, 2014).…”

Section: Basic Water Quality Parameterssupporting

confidence: 93%

Seasonal variations in fate and removal of trace organic chemical contaminants while operating a full-scale membrane bioreactor

Trinh

Akker

Coleman

et al. 2016

Science of The Total Environment

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Trace organic chemical (TrOC) contaminants are of concern for finished water from water recycling schemes because of their potential adverse environmental and public health effects. Understanding the impacts of seasonal variations on fate and removal of TrOCs is important for proper operation, risk assessment and management of treatment systems for water recycling such as membrane bioreactors (MBRs). Accordingly, this study investigated the fate and removal of a wide range of TrOCs through a full-scale MBR plant during summer and winter seasons. TrOCs included 12 steroidal hormones, 3 xeno-estrogens, 2 pesticides and 23 pharmaceuticals and personal care products. Seasonal differences in the mechanisms responsible for removing some of the TrOCs were evident. In particular the contribution of biotransformation and biomass adsorption to the overall removal of estrone, bisphenol A, 17β-estradiol and triclosan were consistently different between the two seasons. Substantially higher percentage removal via biotransformation was observed during the summer sampling period, which compensated for a reduction in removal attributed to biomass adsorption. The opposite was observed during winter, where the contribution of biotransformation to the overall removal of these TrOCs had decreased, which was offset by an improvement in biomass adsorption. The exact mechanisms responsible for this shift are unknown, however are likely to be temperature related as warmer temperatures can lower sorption efficiency, yet enhance biotransformation of these TrOCs.

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Section: Basic Water Quality Parameterssupporting

confidence: 93%

Seasonal variations in fate and removal of trace organic chemical contaminants while operating a full-scale membrane bioreactor

Trinh

Akker

Coleman

et al. 2016

Science of The Total Environment

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“…In turn, as far as the soluble substances are concerned, no significant differences were observed. Similar beneficial effects, i.e., 100% removal of TSS, were obtained in real objects, even if adverse conditions occurred (e.g., low temperature) [30,31]. The effectiveness of TSS removal depends to a large extent on the membrane type used and the size of its pores.…”

Section: Resultssupporting

confidence: 54%

“…The effectiveness of TSS removal depends to a large extent on the membrane type used and the size of its pores. In real wastewater treatment plants, a similarly high removal efficiency of COD (>92%), NH4-N (>99%) [31], and BOD5 (>99.5%) [30] can be achieved. The higher effectiveness of removing COD in the MBR compared to the CAS process could be the result of the TSS retention as well as the retention of polysaccharides and proteins in the supernatant [32].…”

Section: Resultsmentioning

confidence: 93%

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Modeling of Wastewater Treatment Processes in Membrane Bioreactors Compared to Conventional Activated Sludge Systems

et al. 2019

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Membrane techniques constitute an interesting alternative to conventional activated sludge systems (CAS). In membrane bioreactors (MBR), the biomass separated on membranes is retained independently of sludge sedimentation properties. As a consequence, a high biomass concentration as well as low food to microorganisms ratio can be obtained. Moreover, the development of a characteristic activated sludge population is stimulated by the specific conditions prevailing in MBRs. In the study, the operation and treatment efficiency of the MBR and CAS processes were examined and compared. Simulation was performed with the use of GPS-X software. The effluent quality obtained for the MBR system was either better or comparable to that of CAS. The most significant difference concerned the elimination of total suspended solids, which amounted to 99.8% in the MBR. Regarding nutrients, a low concentration of total phosphorus in the effluent from CAS and MBR was obtained (0.67 gP m−3 and 0.50 gP m−3, respectively). Greater differences were achieved in the case of total nitrogen. Although almost complete nitrification took place in both systems, a lower concentration of nitrate in the effluent from MBR in comparison to CAS, i.e., 11.2 gN m−3 and 14.1 gN m−3, respectively, allowed us to obtain a higher removal of total nitrogen (80.8% and 76.1%, respectively).

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“…The level of removal efficiency by biological treatments depends on the physicochemical properties of the compounds, the type of wastewater treatment technology, the hydraulic retention time (HRT), the solids retention time (SRT), and the climatic conditions (e.g., dilution, rainfall, temperature, and level of sunlight) (Kasprzyk-Hordern et al 2009 ; McAdam et al 2010 ; Sahar et al 2011 ). The variation mainly occurs because these parameters, and other physicochemical properties of compounds, affect microbial activity and growth, thereby resulting in a change in effluent quality (Pollice et al 2002 ; Fernandez-Fontaina et al 2012 ; Arévalo et al 2014 ; Chen et al 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Investigating the removal of some pharmaceutical compounds in hospital wastewater treatment plants operating in Saudi Arabia

Qarni

Collier

O’Keeffe

et al. 2016

Environ Sci Pollut Res

120

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The concentrations of 12 pharmaceutical compounds (atenolol, erythromycin, cyclophosphamide, paracetamol, bezafibrate, carbamazepine, ciprofloxacin, caffeine, clarithromycin, lidocaine, sulfamethoxazole and N-acetylsulfamethoxazol (NACS)) were investigated in the influents and effluents of two hospital wastewater treatment plants (HWWTPs) in Saudi Arabia. The majority of the target analytes were detected in the influent samples apart from bezafibrate, cyclophosphamide, and erythromycin. Caffeine and paracetamol were detected in the influent at particularly high concentrations up to 75 and 12 ug/L, respectively. High removal efficiencies of the pharmaceutical compounds were observed in both HWWTPs, with greater than 90 % removal on average. Paracetamol, sulfamethoxazole, NACS, ciprofloxacin, and caffeine were eliminated by between >95 and >99 % on average. Atenolol, carbamazepine, and clarithromycin were eliminated by >86 % on average. Of particular interest were the high removal efficiencies of carbamazepine and antibiotics that were achieved by the HWWTPs; these compounds have been reported to be relatively recalcitrant to biological treatment and are generally only partially removed. Elevated temperatures and high levels of sunlight were considered to be the main factors that enhanced the removal of these compounds.

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Effect of temperature on membrane bioreactor performance working with high hydraulic and sludge retention time

Cited by 50 publications

References 27 publications

Seasonal variations in fate and removal of trace organic chemical contaminants while operating a full-scale membrane bioreactor

Seasonal variations in fate and removal of trace organic chemical contaminants while operating a full-scale membrane bioreactor

Modeling of Wastewater Treatment Processes in Membrane Bioreactors Compared to Conventional Activated Sludge Systems

Investigating the removal of some pharmaceutical compounds in hospital wastewater treatment plants operating in Saudi Arabia

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