Anaerobic treatment of urban wastewater in membrane bioreactors: evaluation of seasonal temperature variations

2014 ◽  
Vol 69 (7) ◽  
pp. 1581-1588 ◽  
Author(s):  
J. B. Giménez ◽  
N. Martí ◽  
A. Robles ◽  
J. Ferrer ◽  
A. Seco
Keyword(s):  
Membrane Permeability ◽  
Energy Recovery ◽  
Anaerobic Treatment ◽  
Membrane Bioreactors ◽  
Cod Removal ◽  
Seasonal Temperature ◽  
Urban Wastewater ◽  
Temperature Variations ◽  
Recovery Potential ◽  
Sludge Production

The objective of this study was to evaluate the effect of seasonal temperature variations on the anaerobic treatment of urban wastewater in membrane bioreactors (MBRs). To this aim, sludge production, energy recovery potential, chemical oxygen demand (COD) removal and membrane permeability were evaluated in a submerged anaerobic MBR fitted with industrial-scale membrane units. The plant was operated for 172 days, between summer and winter seasons. Sludge production increased and energy recovery potential decreased when temperature decreased. COD removal and membrane permeability remained nearby stable throughout the whole experimental period.

Impact of a metabolic uncoupler, 2,4-dichlorophenol on minimization of activated sludge production in membrane bioreactor

2010 ◽  
Vol 62 (6) ◽  
pp. 1379-1385 ◽  
Author(s):  
Lin Song ◽  
Jiang Wenju ◽  
Tang Qiong ◽  
Li Yaozhong
Keyword(s):  
Activated Sludge ◽  
Specific Growth ◽  
Removal Rate ◽  
Significant Inhibition ◽  
Membrane Bioreactors ◽  
Cod Removal ◽  
Slight Reduction ◽  
Floc Size ◽  
Cod Removal Rate ◽  
Sludge Production

This study investigated the effects of 2,4-dichlorophenol on reduction of activated sludge in membrane bioreactors. Significant inhibition on sludge growth and slight reduction in COD removal were observed at higher 2,4-dichlorophenol dosages. The deviation between relative specific COD removal rate (q/q0) and relative specific growth rate (μ/μ0) suggested that a minimum 2,4-dichlorophenol concentration was required for uncoupling of anabolism and catabolism. With the increase of the dosage of 2,4-dichlorophenol, stepwise improvement of biomass bioactivity and the reduction in activated sludge production were achieved simultaneously. Compared with the control bioreactor, the peak distribution of floc size in the 2,4-dichlorophenol added bioreactor shifted to a range of smaller floc size. Besides, addition of 2,4-dichlorophenol caused little variation of microorganism community structure and SVI value of the sludge. After 24-hour operation, the residue 2,4-dichlorophenol concentration in the bioreactors was reduced to a negligible level.

scholarly journals Exploring the limits of anaerobic biodegradability of urban wastewater by AnMBR technology

2018 ◽  
Vol 4 (11) ◽  
pp. 1877-1887 ◽  
Author(s):  
A. Seco ◽  
O. Mateo ◽  
N. Zamorano-López ◽  
P. Sanchis-Perucho ◽  
J. Serralta ◽  
...  
Keyword(s):  
Energy Recovery ◽  
Maximum Energy ◽  
Membrane Bioreactors ◽  
Urban Wastewater ◽  
Anaerobic Biodegradability ◽  
Anaerobic Membrane Bioreactors

Anaerobic membrane bioreactors (AnMBRs) can achieve maximum energy recovery from urban wastewater (UWW) by converting influent COD into methane.

Continuous and sequencing membrane bioreactors applied to food industry effluent treatment

2007 ◽  
Vol 56 (2) ◽  
pp. 71-77 ◽  
Author(s):  
J. Lobos ◽  
C. Wisniewski ◽  
M. Heran ◽  
A. Grasmick
Keyword(s):  
Membrane Permeability ◽  
Water Reuse ◽  
Food Industry ◽  
Membrane Bioreactor ◽  
Membrane Bioreactors ◽  
Effluent Treatment ◽  
Transmembrane Pressure ◽  
Treated Water ◽  
Industry Effluent ◽  
Sludge Production

This work focuses on the performances of two immersed membrane bioreactors used for the treatment of easily biodegradable organic matter present in food industry effluents, for the purpose of water reuse. Two reactor functioning modes (continuous and sequencing) were compared in terms of organic carbon removal and of membrane permeability. For each working mode, pollutant removal was very high, treated water quality presented a low COD concentration (<125 mg.L−1), no solids in suspension and low turbidity (<0.5 NTU). The quality of the treated water (including germ removal) enabled its reuse on site. Moreover, by developing high biomass concentrations in the reactor, excess sludge production remained very low (<0.1 gVSS.gCOD−1). The performances appeared slightly better for the continuous system (lower COD concentration in the effluent, <50 mg.L−1, and lower sludge production). In terms of filtration, a distinct difference was observed between continuous and sequencing systems; transmembrane pressure showed a small and constant evolution rate in continuous membrane bioreactor (CMBR) although it appeared more difficult to control in sequencing membrane bioreactor (SMBR) probably due to punctually higher permeate flow rate and modified suspension properties. The rapid evolution of membrane permeability observed in SMBR was such that more frequent chemical cleaning of the membrane system was required.

scholarly journals UASB Performance and Perspectives in Urban Wastewater Treatment at Sub-Mesophilic Operating Temperature

Water ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 115
Author(s):  
Daniele Cecconet ◽  
Arianna Callegari ◽  
Andrea G. Capodaglio
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Biogas Production ◽  
Operating Temperature ◽  
Pilot Scale ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Uasb Reactor ◽  
Urban Wastewater ◽  
Cod Removal Efficiency

UASBs present several advantages compared to conventional wastewater treatment processes, including relatively low construction cost facilities, low excess sludge production, plain operation and maintenance, energy generation in the form of biogas, robustness in terms of COD removal efficiency, pH stability, and recovery time. Although anaerobic treatment is possible at every temperature, colder climates lead to lower process performance and biogas production. These factors can be critical in determining the applicability and sustainability of this technology for the treatment of urban wastewater at low operating temperature. The purpose of this study is the performance evaluation of a pilot-scale (2.75 m3) UASB reactor for treatment of urban wastewater at sub-mesophilic temperature (25 °C), below the optimal range for the process, as related to biogas production and organic matter removal. The results show that, despite lower methane production and COD removal efficiency compared to operation under ideal conditions, a UASB can still achieve satisfactory performance, and although not sufficient to grant effluent discharge requirements, it may be used as a pretreatment step for carbon removal with some degree of energy recovery. Options for UASB pretreatment applications in municipal WWTPs are discussed.

Pond Treatment of Rettery Wastewaters

1987 ◽  
Vol 19 (12) ◽  
pp. 79-83
Author(s):  
K. Bartoszewski ◽  
A. Bilyk
Keyword(s):  
Activated Sludge ◽  
Treatment Process ◽  
New Technology ◽  
Treatment Plant ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Experimental Results ◽  
Aerobic Conditions ◽  
Aerobic Stabilization ◽  
In Series

Rettery wastewaters were treated in anaerobic and aerobic ponds. Anaerobic treatment yielded efficiencies of BOD5 and COD removal as low as 20%. The treatment process conducted under aerobic conditions in aerated and stabilizing ponds arranged in series took from 18 to 20 days and gave efficiencies of BOD5 and COD removal amounting to 90%. The experimental results were interpreted by virtue of the Eckenfelder equation. Excess activated sludge was subjected to aerobic stabilization in a separate tank. A new technology was suggested for the existing obsolete industrial treatment plant.

Anaerobic Treatment of Polyethylene Terephthalate (PET) Wastewater from Lab to Full Scale

1999 ◽  
Vol 40 (8) ◽  
pp. 229-236 ◽  
Author(s):  
F. Fdz-Polanco ◽  
M. D. Hidalgo ◽  
M. Fdz-Polanco ◽  
P. A. García Encina
Keyword(s):  
Polyethylene Terephthalate ◽  
Loading Rate ◽  
Treatment Plant ◽  
Textile Wastewater ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Foam Formation ◽  
Organic Loading ◽  
Start Up

In the last decade Polyethylene Terephthalate (PET) production is growing. The wastewater of the “Catalana de Polimers” factory in Barcelona (Spain) has two main streams of similar flow rate, esterification (COD=30,000 mg/l) and textile (COD=4000 mg/l). In order to assess the anaerobic treatment viability, discontinuous and continuous experiments were carried out. Discontinuous biodegradability tests indicated that anaerobic biodegradability was 90 and 75% for esterification and textile wastewater. The textile stream revealed some tendency to foam formation and inhibitory effects. Nutrients, micronutrients and alkali limitations and dosage were determined. A continuous lab-scale UASB reactor was able to treat a mixture of 50% (v) esterification/textile wastewater with stable behaviour at organic loading rate larger than 12 g COD/l.d (0.3 g COD/g VSS.d) with COD removal efficiency greater than 90%. The start-up period was very short and the recuperation after overloading accidents was quite fast, in spite of the wash-out of solids. From the laboratory information an industrial treatment plant was designed and built, during the start-up period COD removal efficiencies larger than 90% and organic loading rate of 0.6 kg COD/kg VSS.d (5 kg COD/m3.d) have been reached.

Energy recovery potential in coupling of sanitation and agriculture: Techno-economic analysis on resource-oriented sanitation

2021 ◽  
Vol 126 ◽  
pp. 141-151
Author(s):  
Mingjie Xu ◽  
Yu Zhang ◽  
Yahui Li ◽  
Minghuan Lv ◽  
Shikun Zhu ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Energy Recovery ◽  
Recovery Potential
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