scholarly journals Controlled synthesis and wastewater treatment of Ag2O/TiO2 modified chitosan-based photocatalytic film

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 11211-11221 ◽  
Author(s):  
Yilin Zhao ◽  
Chengran Tao ◽  
Gang Xiao ◽  
Haijia Su
Keyword(s):  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Membrane Separation ◽  
Controlled Synthesis ◽  
High Adsorption ◽  
Modified Chitosan

A novel Ag2O/TiO2-modified chitosan-based photocatalytic film with high adsorption and photocatalytic activity was synthesized, based upon the coupling of the synergistic catalytic technique of nano Ag2O/TiO2 and membrane separation.

Nanotechnology-Based Nano-Biosorbents

2020 ◽  
pp. 386-408
Author(s):  
Mintu Maan Dutta ◽  
Anushmita Charingia
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Metal Ions ◽  
Water Purification ◽  
Heavy Metal Ions ◽  
Membrane Separation ◽  
Water Bodies ◽  
Modified Chitosan ◽  
Purification Methods ◽  
Industrial Sources

Most countries worldwide face the problem related to clean and safe water. The major source of contamination of water bodies includes the discharges of wastes from various domestic and industrial sources (heavy metal ions, dyes, and pharmaceuticals). To overcome those problems, various water purification methods such as coagulation, flocculation, adsorption, membrane separation, biological, and electrochemical methods have been engaged. Adsorption using nano-biosorbents based on chitin, chitosan and modified chitosan, cellulose, alginate, micro algal has emerged as a better alternative for the removal of contaminants from drinking and wastewater treatment. The main advantages of these nano-biosorbents include its biodegradability and eco-friendliness, which have attracted researchers to this field.

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.

BiVO4hollow microplates: controlled synthesis and enhanced photocatalytic activity achieved through one-step boron doping and Co(OH)2loading

CrystEngComm ◽  
2017 ◽  
Vol 19 (42) ◽  
pp. 6305-6313 ◽  
Author(s):  
Abraham Adenle ◽  
De-Kun Ma ◽  
De-Peng Qu ◽  
Wei Chen ◽  
Shaoming Huang
Keyword(s):  
Photocatalytic Activity ◽  
Boron Doping ◽  
Controlled Synthesis ◽  
One Step

BiVO4hollow microplates co-modified by boron doping and Co(OH)2nanoparticle loading achieved enhanced photocatalytic activity.

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.

Controlled synthesis of CeVO4 hierarchical hollow microspheres with tunable hollowness and their efficient photocatalytic activity

CrystEngComm ◽  
2018 ◽  
Vol 20 (31) ◽  
pp. 4499-4505 ◽  
Author(s):  
Jinjin Ding ◽  
Xuan Liu ◽  
Miao Wang ◽  
Quan Liu ◽  
Tongming Sun ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hollow Microspheres ◽  
Controlled Synthesis ◽  
One Step ◽  
Hydrothermal Approach

CeVO4 hierarchical hollow microspheres assembled from nanoscaled building units (nanoparticles, nanocubes and nanoflakes) were synthesized by a one-step hydrothermal approach using l-Asp as the morphology-directing agent.

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.

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