scholarly journals An evaluation of MBR and conventional pretreatment for reverse osmosis for water reclamation

2011 ◽  
Vol 1 (2) ◽  
pp. 88-98
Author(s):  
J. Xu ◽  
F. C. Kent ◽  
K. Farahbakhsh
Keyword(s):  
Reverse Osmosis ◽  
Membrane Bioreactor ◽  
Pilot Scale ◽  
Secondary Treatment ◽  
Water Reclamation ◽  
Effluent Water ◽  
Effluent Quality ◽  
The Difference ◽  
Rotating Biological Contactors

Two wastewater polishing systems were compared in terms of their ability to protect downstream reverse osmosis (RO) processes. A conventional full-scale wastewater treatment system with primary and secondary treatment followed by rotating biological contactors (RBC) and sand filtration were compared in a side-by-side study with a pilot-scale membrane bioreactor (MBR). Effluent from the two pretreatment trains was sent to two identical RO pilot systems. The effluent water quality of the two systems was compared as well as the RO performance. The MBR pretreatment provided effluent with a turbidity (0.11 NTU) that was more than five times lower than that of the conventional system (0.58 NTU). The fouling rate of the RO system with MBR pretreatment was 50–67% of the value found for the RO system with conventional pretreatment and the difference in turbidity values was identified as the major source of this large difference. The RO effluent quality of both systems was excellent, with similar overall removals in both systems. The study emphasizes the importance of removing particulate matter for the prevention of RO fouling within water reclamation.

scholarly journals Microbiological and physicochemical evaluation of the effluent quality in a membrane bioreactor system to meet the legislative limits for wastewater reuse

2017 ◽  
Vol 76 (7) ◽  
pp. 1796-1804 ◽  
Author(s):  
Konstantinos Azis ◽  
Charalampos Vardalachakis ◽  
Spyridon Ntougias ◽  
Paraschos Melidis
Keyword(s):  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Wastewater Reuse ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Transmembrane Pressure ◽  
Permeate Flux ◽  
Effluent Quality ◽  
Mediterranean Countries

The aim of this study was to assess the efficacy and effluent quality of a pilot-scale intermittently aerated and fed, externally submerged membrane bioreactor (MBRes) treating municipal wastewater. The effluent quality of the MBRes was evaluated regarding system ability to comply with the Greek legislative limits for restricted and unrestricted wastewater reuse. The average permeate flux was 13.9 L m−2 h−1, while the transmembrane pressure remained above the level of −110 mbar. Experimental data showed that biochemical oxygen demand, chemical oxygen demand, total nitrogen, PO43−- P and total suspended solids removal efficiencies were 97.8, 93.1, 89.6, 93.2 and 100%, respectively, whereas turbidity was reduced by 94.1%. Total coliforms and Escherichia coli were fully eliminated by ultrafiltration and disinfection methods, such as chlorination and ultraviolet radiation. In agreement with the Greek legislation (Joint Ministerial Decree 145116/11) and the guidelines recommended for the Mediterranean countries, the disinfected effluent of the MBRes system can be safely reused directly for urban purposes.

Combined membrane bioreactor (MBR) and reverse osmosis (RO) system for thin-Þlm transistor - liquid crystal display TFT-LCD, industrial wastewater recycling

2004 ◽  
Vol 50 (2) ◽  
pp. 99-106 ◽  
Author(s):  
T.K. Chen ◽  
J.N. Chen
Keyword(s):  
Reverse Osmosis ◽  
Industrial Wastewater ◽  
Membrane Bioreactor ◽  
Cooling Tower ◽  
Liquid Crystal Display ◽  
Experimental Period ◽  
Effluent Quality ◽  
Quality Water ◽  
Wastewater Recycling

In TFT-LCD industry, water plays a variety of roles as a cleaning agent and reaction solvent. As good quality water is increasingly a scarce resource and wastewater treatment costs rises, the once-through use of industrial water is becoming uneconomical and environmentally unacceptable. Instead, recycling of TFT-LCD industrial wastewater is become more attractive from both an economic and environmental perspective. This research is mainly to explore the capacity of TFT-LCD industrial wastewater recycling by the process combined with membrane bioreactor and reverse osmosis processes. Over the whole experimental period, the MBR process achieved a satisfactory organic removal. The COD could be removed with an average of over 97.3%. For TOC and BOD5 items, the average removal efficiencies were 97.8 and 99.4% respectively. The stable effluent quality and satisfactory removal performance were ensured by the efficient interception performance of the UF membrane device incorporated with biological reactor. Moreover, the MBR effluent did not contain any suspended solids and the SDI value was under 3. After treatment of RO, excellent water quality of permeate were under 5 mg/l, 2.5 mg/l and 150 ms/cm for COD, TOC and conductivity respectively. The treated water can be recycled for the cooling tower make-up water or other purposes.

Pilot-scale testing membrane bioreactor for wastewater reclamation in industrial laundry

2002 ◽  
Vol 46 (4-5) ◽  
pp. 67-76 ◽  
Author(s):  
M. Andersen ◽  
G.H. Kristensen ◽  
M. Brynjolf ◽  
H. Grüttner
Keyword(s):  
Membrane Bioreactor ◽  
Hydraulic Retention Time ◽  
Cross Flow ◽  
Pilot Scale ◽  
Cationic Polymer ◽  
Additional Treatment ◽  
Wastewater Reclamation ◽  
Membrane Cleaning ◽  
Cross Flow Velocity

A pilot-scale study of membrane bioreactor treatment for reclamation of wastewater from Berendsen Textile Service industrial laundry in Søborg, Denmark was carried out over a 4 month period. A satisfactory COD degradation was performed resulting in a low COD in the permeate (<50 mg/l). To obtain satisfactory treatment, addition of nitrogen was necessary. The biodegradability of the permeate was very low (BOD5<2 mg/l). A hydraulic retention time of 1 d turned out to be sufficient at a sludge concentration of 10 g MLSS/l. Through addition of a cationic polymer, a satisfactory dewaterability of the sludge was reached. Membrane tests showed that operating at a trans-membrane pressure of 3 bar and a cross-flow velocity of 4 m/s, a flux of 120 l/m2h can be expected without using chemicals for membrane cleaning. The quality of the permeate was very good when comparing to the reuse quality demands of water to the wash processes. Reuse of the permeate in all rinsing steps requires additional treatment through reverse osmosis.

Comparative study of membrane bioreactor (MBR) and activated sludge processes in the treatment of Moroccan domestic wastewater

2018 ◽  
Vol 78 (5) ◽  
pp. 1129-1136 ◽  
Author(s):  
S. Kitanou ◽  
M. Tahri ◽  
B. Bachiri ◽  
M. Mahi ◽  
M. Hafsi ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Ceramic Membrane ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Quality Parameters ◽  
Effluent Quality ◽  
Conventional Activated Sludge ◽  
Activated Sludge Processes

Abstract The study was based on an external pilot-scale membrane bioreactor (MBR) with a ceramic membrane compared to a conventional activated sludge process (ASP) plant. Both systems received their influent from domestic wastewater. The MBR produced an effluent of much better quality than the ASP in terms of total suspended solids (TSS), 5-day biological oxygen demand (BOD5) and chemical oxygen demand (COD), total phosphorus (TP) and total nitrogen (TN). Other effluent quality parameters also indicated substantial differences between the ASP and the MBR. This study leads to the conclusion that in the case of domestic wastewater, MBR treatment leads to excellent effluent quality. Hence, the replacement of ASP by MBR may be justified on the basis of the improved removal of solids, nutrients, and micropollutants. Furthermore, in terms of reuse the high quality of the treated water allows it to be reused for irrigation.

Pathogen removal in experimental deep effluent storage reservoirs

1996 ◽  
Vol 33 (7) ◽  
pp. 251-260 ◽  
Author(s):  
H. W. Pearson ◽  
D. D. Mara ◽  
L. R. Cawley ◽  
J. I. Oragui ◽  
S. A. Silva
Keyword(s):  
Water Column ◽  
Microbiological Quality ◽  
Operating Regime ◽  
Pilot Scale ◽  
Pathogen Removal ◽  
Effluent Quality ◽  
Physico Chemical ◽  
Storage Reservoirs ◽  
High Ammonia

Studies on batch loaded pilot-scale deep effluent storage reservoirs (ESR) in NE Brazil using the operating regime of Fill, Rest and Use, rapidly produced a high microbiological quality effluent suitable for unrestricted irrigation ie. within 28 days at water temperatures of 25°C. There was little vertical variation in water quality in the ESR as the water column turned over at night. Physico chemical quality rather than microbiological quality of the effluent was more likely to control effluent re-use strategies and purification times as there were persistantly high ammonia and sulphide levels. ESR's could be organically loaded at rates similar to those used for facultative lagoons either using anaerobic pond effluent or raw sewage but the latter involved slightly longer purification times. The ESR's produced no odour problems. FC proved a good indicator of microbiological effluent quality and helminths could not be detected in the water column by the time the reservoir was full.

Membrane bioreactor for water reclamation in Singapore

2008 ◽  
Vol 3 (2) ◽  
Author(s):  
Guihe Tao ◽  
Kiran Kekre ◽  
Bala Visvanath ◽  
Maung Htun Oo ◽  
Harry Seah
Keyword(s):  
Membrane Bioreactor ◽  
Pilot Scale ◽  
Water Reclamation ◽  
Industrial Water ◽  
Technology Evaluation ◽  
Chemical Cleaning ◽  
The Public ◽  
Start Up ◽  
Demonstration Plant ◽  
Set Up

The Public Utilities Board (PUB) of Singapore embarked on MBR technology evaluation program in 2002. The three systems, i.e. Zenon system, Mitsubishi system and Kubota system, were set up in early 2003 and evaluated. Other MBR systems like Memcor MBR, Toyoplus MBR, Singaport Cleanseas MBR, Huber MBR and Asahi MBR were tested later on or is under testing. These trials have generated valuable information on the design and operation of the MBR systems under tropical environment in pilot scales. PUB decided to extend the pilot scale operations by building a 23,000 m3/d demonstration plant at Ulu Pandan Water Reclamation Plant. This plant was commissioned in December 2006. The product of this plant is supplied to industries as Industrial Water. The plant produces industrial water which is superior to all the requirements. The power consumption is about 0.55 kwh/m3 and no intensive chemical cleaning has been done since the start-up of the plant for about 7 months.

Nitrification and mass balance with a membrane bioreactor for municipal wastewater treatment

1996 ◽  
Vol 34 (1-2) ◽  
pp. 129-136 ◽  
Author(s):  
Fan Xiao-Jun ◽  
Vincent Urbain ◽  
Yi Qian ◽  
Jacques Manem
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Rate Coefficients ◽  
Nitrification Rate ◽  
Municipal Wastewater Treatment ◽  
Effluent Quality

The overall performance of the Membrane Bioreactor (MBR) process for municipal wastewater treatment was studied to determine the characteristics of activated sludge under different Sludge Retention Times (SRT) and Hydraulic Retention Times (HRT). The experiment lasted over a period of 300 days, which included 4 runs. The effluent quality of the MBR process in terms of COD and suspended solids, was excellent under all conditions tested. Specific nitrification rates of the activated sludge were measured at steady state in each run. Similar maximum nitrification rate values were obtained through batch experiments with either only NH4Cl or raw wastewater as substrate. Mass balances of the process in terms of COD, nitrogen and inorganic suspended solids were made, and it was found that 28%, 42%, and 48% of influent COD were converted into activated sludge at SRTs of 20, 10, and 5 days, respectively. The COD/VSS ratio of the activated sludge seems to be dependent on mass loading rate. The estimated true yield and decay rate coefficients of the activated sludge were 0.61 kgCOD/kgCOD and 0.050 d−1, respectively. In the completely aerobic system, nitrogen balances were always close to 100%.

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