Process efficiency and microbial monitoring in MBR (membrane bioreactor) and CASP (conventional activated sludge process) treatment of tannery wastewater

2008 ◽  
Vol 99 (18) ◽  
pp. 8559-8564 ◽  
Author(s):  
Giulio Munz ◽  
Mori Gualtiero ◽  
Laura Salvadori ◽  
Barberio Claudia ◽  
Lubello Claudio
Keyword(s):  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Process Efficiency ◽  
Tannery Wastewater ◽  
Activated Sludge Process ◽  
Microbial Monitoring ◽  
Conventional Activated Sludge ◽  
Conventional Activated Sludge Process

Feasibility of the membrane bioreactor process for water reclamation

2001 ◽  
Vol 43 (10) ◽  
pp. 203-209 ◽  
Author(s):  
S. Adham ◽  
P. Gagliardo ◽  
L. Boulos ◽  
J. Oppenheimer ◽  
R. Trussell
Keyword(s):  
Literature Review ◽  
Activated Sludge ◽  
Membrane Bioreactor ◽  
Cost Evaluation ◽  
Water Reclamation ◽  
Activated Sludge Process ◽  
Conventional Activated Sludge ◽  
In Series ◽  
Volumetric Loading ◽  
Conventional Activated Sludge Process

The feasibility of the membrane bioreactor (MBR) process for water reclamation was studied. Process evaluation was based on the following: literature review of MBRs, worldwide survey of MBRs, and preliminary costs estimates. The literature review and the survey have shown that the MBR process offers several benefits over the conventional activated sludge process, including: smaller space and reactor requirements, better effluent water quality, disinfection, increased volumetric loading, and less sludge production. The MBR process can exist in two different configurations, one with the low-pressure membrane modules replacing the clarifier downstream the bioreactor (in series), and the second with the membranes submerged within the bioreactor. Four major companies are currently marketing MBRs while many other companies are also in the process of developing new MBRs. The MBR process operates in a considerably different range of parameters than the conventional activated sludge process. The preliminary cost evaluation has shown that the MBR process is cost competitive with other conventional wastewater treatment processes.

Production of Sludge in a Submerged Membrane Bioreactor and Dewatering Aspects

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Watsa Khongnakorn ◽  
Christelle Wisniewski
Keyword(s):  
Activated Sludge ◽  
Water Reuse ◽  
Membrane Bioreactor ◽  
Operating Conditions ◽  
Good Prediction ◽  
Activated Sludge Process ◽  
Conventional Activated Sludge ◽  
Sludge Dewaterability ◽  
Conventional Activated Sludge Process ◽  
Sludge Production

In wastewater treatment, the membrane bioreactor (MBR) holds the potential to become one of the new generation processes, ensuring effluent quality and disinfection of sufficiently high levels to allow water reuse and recycle. Furthermore, the possibility to operate with high biomass concentrations (2 to 5 times higher than in conventional activated sludge process, CAS) allows to impose high solid retention times(SRT) that can be beneficial to a sludge production reduction and so to a reduction of disposal costs. These non-conventional operating conditions (high SRT) can also induce different sludge characteristics and dewatering aptitude, which are essential parameters for the optimization of the sludge post-treatment, like mechanical dewatering. The objective of this work was to study the performances of a complete sludge retention membrane bioreactor, in terms of organic removal efficiency, sludge production and sludge dewaterability. The adaptability of Activated Sludge Model 3 (ASM3) to provide good prediction results of high SRT-MBR was studied. Typical parameters adopted to describe sludge dewaterability were quantified and compared with the conventional activated sludge process (CAS).

High rate and compact single sludge pre-denitrification process for retrofit

1994 ◽  
Vol 30 (6) ◽  
pp. 31-40 ◽  
Author(s):  
Hiroyshi Emori ◽  
Hiroki Nakamura ◽  
Tatsuo Sumino ◽  
Tadashi Takeshima ◽  
Katsuzo Motegi ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
High Rate ◽  
Activated Sludge Process ◽  
Nitrogen And Phosphorus ◽  
Conventional Activated Sludge ◽  
Treatment Techniques ◽  
Conventional Activated Sludge Process ◽  
Denitrification Process

For the sewage treatment plants near rivers and closed water bodies in urbanized areas in Japan and European countries, there is a growing demand for introduction of advanced treatment processes for nitrogen and phosphorus from the viewpoints of water quality conservation and environmental protection. In order to remove nitrogen by the conventional biological treatment techniques, it is necessary to make a substantial expansion of the facility as compared with the conventional activated sludge process. In such urbanized districts, it is difficult to secure a site and much capital is required to expand the existing treatment plant. To solve these problems, a compact single sludge pre-denitrification process using immobilized nitrifiers was developed. Dosing the pellets, which are suitable for nitrifiers growth and physically durable, into the nitrification tank of single sludge pre-denitrification process made it possible to perform simultaneous removal of BOD and nitrogen in a retention time equal to that in the conventional activated sludge process even at the low water temperature of about 10 °C. The 3,000 m3/d full-scale conventional activated sludge plant was retrofitted and has been successfully operated.

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