scholarly journals Electrobaromembrane apparatuses: Classification and particular application for wastewater treatment

2019 ◽  
pp. 236-249
Author(s):  
Sergey Lazarev ◽  
Sergey Kovalev ◽  
Konstantin Shestakov
Keyword(s):  
Wastewater Treatment ◽  
Membrane Separation ◽  
Retention Factor ◽  
Test System ◽  
Specific Flow ◽  
Membrane Pores ◽  
Empirical Coefficients ◽  
Multilevel Classification ◽  
Engineering Industries

The aims of this work are developing the electrobaromembrane apparatus classification and study of the particular case of electrobaromembrane process application for wastewater treatment in engineering industries. The multilevel classification of electrobaromembrane processes, which takes into account several factors at once, is proposed. A particular case of electrobaromembrane process application for treatment of the galvanic solution produced by JSC "Zavod Tambovpolimermash" is studied in this work. The research was carried out on the experimental electrobaromembrane plant with flat chambers. In addition, some approximation functions and their numerical values of empirical coefficients were obtained for experimental data of the specific flow and the retention factor of membranes OPMN-P and AMN-P. The result comparison of nanofiltration and electronanofiltration processes shows that the permeability of the solution through the membrane pores increases when a constant electric current density is applied to the test system. During nanofiltration, process membranes are compacted due to the overpressure increase. This directly affects the driving force of the membrane separation process for a particular type of solution, thereby the retention factor of porous membranes increases. Retention factor values do not differ a lot for certain types of ions. In contrast, electronanofiltration process is characterized by the selectivity of membranes with respect to a certain type of ions. The near-cathode OPMN-P membrane mainly passes thought itself the Zn2+ cations and holds the Cl- and SO4 2- anions, while the near-anode AMN-P membrane mainly passes thought itself the Cl- and SO4 2- anions and holds the Zn2+ cations.

Floc size distribution and bacterial activities in membrane separation activated sludge processes for small-scale wastewater treatment/reclamation

1997 ◽  
Vol 35 (6) ◽  
pp. 37-44 ◽  
Author(s):  
Boran Zhang ◽  
Kazuo Yamamoto ◽  
Shinichiro Ohgaki ◽  
Naoyuki Kamiko
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Membrane Separation ◽  
Small Scale ◽  
Nitrification Rate ◽  
Floc Size ◽  
Denitrification Activity ◽  
Concentration Changes ◽  
Activated Sludge Processes

Activated sludges taken from full-scale membrane separation processes, building wastewater reuse system (400m3/d), and two nightsoil treatment plants (50m3/d) as well as laboratory scale membrane separation bioreactor (0.062m3/d) were analyzed to characterize membrane separation activated sludge processes (MSAS). They were also compared with conventional activated sludges(CAS) taken from municipal wastewater treatment plants. Specific nitrification activity in MSAS processes averaged at 2.28gNH4-N/kgMLSS.h were higher than that in CAS processes averaged at 0.96gNH4-N/kgMLSS.h. The denitrification activity in both processes were in the range of 0.62-3.2gNO3-N/kgMLSS.h without organic addition and in the range of 4.25-6.4gNO3-N/kgMLSS.h with organic addition. The organic removal activity in nightsoil treatment process averaged at 123gCOD/kgMLSS.h which was significantly higher than others. Floc size distributions were measured by particle sedimentation technique and image analysis technique. Flocs in MSAS processes changed their sizes with MLSS concentration changes and were concentrated at small sizes at low MLSS concentration, mostly less than 60 μm. On the contrary, floc sizes in CAS processes have not much changed with MLSS concentration changes and they were distributed in large range. In addition, the effects of floc size on specific nitrification rate, denitrification rate with and without organic carbon addition were investigated. Specific nitrification rate was decreased as floc size increased. However, little effect of floc size on denitrification activity was observed.

scholarly journals Deep learning-based morphology classification of activated sludge flocs in wastewater treatment plants

2021 ◽  
Author(s):  
Hisashi Satoh ◽  
Yukari Kashimoto ◽  
Naoki Takahashi ◽  
Takashi Tsujimura
Keyword(s):  
Wastewater Treatment ◽  
Deep Learning ◽  
Activated Sludge ◽  
Morphological Change ◽  
Wastewater Treatment Plants ◽  
Filamentous Bacteria ◽  
Sludge Flocs

A deep learning-based two-label classifier 1 recognized a 20% morphological change in the activated flocs. Classifier-2 quantitatively recognized an abundance of filamentous bacteria in activated flocs.

Ultrafiltration membrane separation for anaerobic wastewater treatment

1994 ◽  
Vol 30 (12) ◽  
pp. 321-327 ◽  
Author(s):  
Ahmadun Fakhru'l-Razi
Keyword(s):  
Wastewater Treatment ◽  
Membrane Separation ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Reactor Performance ◽  
Water And Wastewater Treatment ◽  
Active Biomass ◽  
Biomass Loss ◽  
Scientists And Engineers ◽  
Uf Membranes

Membrane technology has attracted a lot of attention from scientists and engineers in recent years as a new separation process. Various membrane technologies such as reverse osmosis (RO), ultrafiltration (UF) and microfiltration (MF) have been successfully used for a variety of water and wastewater treatment applications. In this study UF membranes of 10 000 nominal molecular weight limit were used in conjunction with an anaerobic reactor to treat wastewater from a brewery. The UF membranes serve to retain active biomass in the reactor, which is essential for a good reactor performance and for the production of a clear final effluent. The reactor was operated over a range of hydraulic retention times and organic loading rates (OLR) in order to evaluate its treatment efficiency. Six steady states were attained over a range of mixed liquor suspended solids (31 000-38 000 mg 1−1). The maximum organic loading rate applied was 19.7 kg COD m−3 d−1 resulting in a methane yield of 0.27 1 CH4 g−1 COD. The percentages of COD removal achieved were above 96%. The results indicated that the UF membranes were capable of efficient biomass-effluent separation thus preventing any biomass loss from the reactor and have potential for treating industrial wastewaters.

Membrane Separation Coupled with Photocatalysis for Water Supply and Wastewater Treatment

2013 ◽  
Vol 671-674 ◽  
pp. 2571-2574 ◽  
Author(s):  
Zhi Yang Wang ◽  
Ling Wang ◽  
Lin Fei Yao ◽  
Mei Le Pei ◽  
Guo Liang Zhang
Keyword(s):  
Wastewater Treatment ◽  
Water Supply ◽  
Membrane Reactor ◽  
Membrane Separation ◽  
Hybrid Technology ◽  
The Past ◽  
Continuous Running ◽  
Photocatalytic Membrane Reactor

Membrane separation coupled with photocatalysis process, which is also called photocatalytic membrane reactor (PMR), is a new hybrid technology working for water supply and wastewater treatment. Due to some unique advantages, such as nontoxic and continuous running, this kind of novel coupling systems has developed rapidly in the past few years. In this work, the characteristic and structure of configurations, photocatalysts and membranes are analyzed briefly.

scholarly journals Study of Chromium Removal by the Electrodialysis of Tannery and Metal-Finishing Effluents

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Ruan C. A. Moura ◽  
Daniel A. Bertuol ◽  
Carlos A. Ferreira ◽  
Franco D. R. Amado
Keyword(s):  
Wastewater Treatment ◽  
Ion Exchange ◽  
Electric Field ◽  
Driving Force ◽  
Membrane Separation ◽  
Physicochemical Process ◽  
Separation Technique ◽  
Chromium Removal ◽  
Metal Finishing ◽  
Interesting Alternative

The metal-finishing and tannery industries have been under strong pressure to replace their current wastewater treatment based on a physicochemical process. The electrodialysis process is becoming an interesting alternative for wastewater treatment. Electrodialysis is a membrane separation technique, in which ions are transported from one solution to another through ion-exchange membranes, using an electric field as the driving force. Blends of polystyrene and polyaniline were obtained in order to produce membranes for electrodialysis. The produced membranes were applied in the recovery of baths from the metal-finishing and tannery industries. The parameter for electrodialysis evaluation was the percentage of chromium extraction. The results obtained using these membranes were compared to those obtained with the commercial membrane Nafion 450.

Wastewater treatment using membranes: the North American experience

2000 ◽  
Vol 41 (10-11) ◽  
pp. 209-215 ◽  
Author(s):  
P. Côté ◽  
D. Thompson
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Process Development ◽  
Membrane Separation ◽  
Municipal Wastewater Treatment ◽  
Commercial Development ◽  
American Experience ◽  
The North ◽  
Small Flow ◽  
Development Applications

Key features of the process consisting in coupling biological treatment with membrane separation are described for wastewater treatment. The process development started in the early 1970s with small flow rate applications for on-site commercial development applications and industrial wastewater treatment. The introduction of immersed membrane in the early 1990s allowed the process to be used for municipal wastewater treatment. The results from the 1st year of operation of a 3,800 m3/d plant are presented.

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