Physico‐Chemical and Kinetic Evaluation of a Combined Vertical Settler/Self‐Aerated Unit for Wastewater Treatment and Reuse

2021 ◽  
pp. 2100147
Author(s):  
Mohamed A. El‐Khateeb
Keyword(s):  
Wastewater Treatment ◽  
Kinetic Evaluation ◽  
Physico Chemical

scholarly journals Experimental and Physico-Chemical Comparison of ZnO Nanoparticles’ Activity for Photocatalytic Applications in Wastewater Treatment

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 678
Author(s):  
Stefano Alberti ◽  
Irene Basciu ◽  
Marco Vocciante ◽  
Maurizio Ferretti
Keyword(s):  
Wastewater Treatment ◽  
Zno Nanoparticles ◽  
Energy Dispersive Spectrometer ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Commercial Sample ◽  
Synthetic Process ◽  
Physico Chemical ◽  
Photocatalytic Applications ◽  
Reflectance Measurements

In this contribution, the photoactivity upon activation by simulated sunlight of zinc oxide (ZnO) obtained from two different synthetic pathways (Acetate and Nitrate) is investigated for water purification. Different reagents and processes were exploited to obtain ZnO nanoparticles. Products have been characterized by means of X-Ray Diffraction, Scanning Electron Microscopy along with Energy Dispersive Spectrometer, Dynamic Light Scattering, and Diffuse Reflectance Measurements, to highlight the different outcomes ascribable to each synthesis. A comparison of characteristics and performances was also carried out with respect to commercial ZnO. Nanoparticles of this semiconductor can be obtained as aggregates with different degrees of purity, porosity, and shape, and their physical-chemical properties have been addressed to the specific use in wastewater treatment, testing their effectiveness on the photocatalytic degradation of methylene blue (MB) as a model pollutant. Excluding the commercial sample, experimental results evidenced a better photocatalytic behavior for the ZnO Nitrate sample annealed at 500 °C, which was found to be pure and stable in water, suggesting that ZnO could be effectively exploited as a heterogeneous photocatalyst for the degradation of emerging pollutants in water, provided that thermal treatment is included in the synthetic process.

scholarly journals Development of a combined anaerobic and aerobic membrane bioreactor for wastewater treatment and reclamation in terrestrial-based controlled ecological life support system

2018 ◽  
Vol 19 (3) ◽  
pp. 718-724
Author(s):  
Zhenmin Cheng ◽  
Yuansong Wei ◽  
Min Gao ◽  
Junya Zhang ◽  
Liangchang Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Support System ◽  
Membrane Bioreactor ◽  
Life Support ◽  
Specific Energy Consumption ◽  
Community Analysis ◽  
Microbial Community Analysis ◽  
Trace Gas ◽  
Life Support System ◽  
Physico Chemical

Abstract A novel wastewater treatment and reuse system (WTRS) combining an anaerobic membrane bioreactor (AnMBR) and an aerobic membrane bioreactor (MBR) with the design capacity of 115 L/d was developed for a terrestrial-based controlled ecological life support system (CELSS). Results clearly showed that the WTRS realized mineralization of organic compounds and reservation of nitrogenous nutrient, therefore converting the effluent into replenishment for the hydroponic system. Trace gas emission from the WTRS could meet requirements for the whole CELSS. Compared with physico-chemical processes, the specific consumables consumption of the WTRS was advantageous but its specific energy consumption is still in need of improvement. Results of microbial community analysis were consistent with the running state of the AnMBR and the MBR.

Coking Wastewater Physico-Chemical Treatment Technology Evolvement Review

2013 ◽  
Vol 864-867 ◽  
pp. 88-95 ◽  
Author(s):  
Zhi Jiao Liu ◽  
Yun Lng Yang
Keyword(s):  
Wastewater Treatment ◽  
Water Oxidation ◽  
Photocatalytic Oxidation ◽  
Recovery Process ◽  
Coking Wastewater ◽  
Fenton Reagent ◽  
Treatment Technology ◽  
Gas Treatment ◽  
Physico Chemical ◽  
Treatment Research

Coal coking wastewater is generated from coking, coal gas purification and coking product recovery process, its composition is complex and difficult to degrade. By introducing the coking wastewater treatment research and application, such as adsorption,coagulation and sedimentation, flue gas treatment and other physical methods, as well advanced oxidation, wet oxidation, Fenton reagent method, photocatalytic oxidation, ultrasonic oxidation, ozone oxidation method, electrochemical oxidation, supercritical water oxidation, incineration and plasma technology, this paper puts forward the trend of coking wastewater treatment technology.

Wastewater Treatment With Activated Carbon

1972 ◽  
Vol 7 (1) ◽  
pp. 1-12
Author(s):  
A. Benedek
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Chemical Treatment ◽  
Technological Development ◽  
Municipal Waste ◽  
Research Needs ◽  
Physico Chemical ◽  
Recent Developments

Abstract Recent developments in the application of activated carbon to wastewater treatment are reviewed. Particular emphasis is placed on the physico-chemical treatment of municipal waste. Technological development, adsorptive behaviour, and research needs serve as the three primary discussion topics.

Wastewater treatment mechanisms in anoxic stabilization ponds

1996 ◽  
Vol 33 (7) ◽  
pp. 125-132 ◽  
Author(s):  
A. Almasi ◽  
M. B. Pescod
Keyword(s):  
Wastewater Treatment ◽  
Hydrogen Sulphide ◽  
Biological Activities ◽  
Euphotic Zone ◽  
Methanogenic Bacteria ◽  
Stabilization Ponds ◽  
Physico Chemical ◽  
Sulphur Bacteria ◽  
Green Sulphur ◽  
Treatment Mechanisms

Studies on the performance of wastewater stabilization ponds operating in the “grey” area of organic loading between fully anaerobic and facultative conditions show that organic matter removal is still satisfactory. The results obtained revealed that wastewater treatment mechanisms are mainly based on biochemical reactions in the anoxic system. Although physico-chemical mechanisms were not negligible, algal activities in the presence of light proved to be important in the surface layer of the pond and facultative bacteria were working mutually with the algae. Motile flagellate algae (Euglena and Chlamydomonas) were the only species found to exist under anoxic conditions. It was also determined that sulphate-reducing bacteria predominated in the lower volume of the anoxic ponds, rather than acidogenic bacteria, and this caused sulphide and hydrogen sulphide build-up in the pond's contents. The bottom volume of the ponds and the benthic sludge in laboratory-scale anoxic ponds contained acid producers and methanogenic bacteria causing the release of biogas. It is hypothesized that phototrophic bacteria (purple sulphur-, green sulphur- and purple non-sulphur bacteria) act as a biological filter to oxidize sulphide and hydrogen sulphide in the euphotic zone of the anoxic ponds. As a consequence of the latter biological activities, anoxic ponds are likely to prove viable alternatives to anaerobic and facultative ponds, where odour nuisance and high land requirements, respectively, are to be avoided.

Concepts and methodologies to minimize pollutant discharge for zero-emission production

1999 ◽  
Vol 39 (10-11) ◽  
pp. 9-16 ◽  
Author(s):  
Hong-Ying Hu ◽  
Naohiro Goto ◽  
Koichi Fujie
Keyword(s):  
Wastewater Treatment ◽  
Production Process ◽  
Molecular Size ◽  
Preliminary Evaluation ◽  
Flow Sheet ◽  
Production Processes ◽  
Physico Chemical ◽  
Materials Used ◽  
Pollutant Discharge ◽  
Novel Concept

The present study aims to present basic concepts to minimize the emissions from industrial production processes. Strategies and methodologies to analyze emissions from various production processes, to establish a so called negative flow sheet and to reduce the emissions from those processes by refining and/or replacing the present production process with an alternative process are discussed. Preliminary evaluation and management systems of the materials used in the production process based on characteristics such as microbial and physico-chemical treatabilities are proposed as well. The relationship between the removal efficiency of dissolved organic carbon in the five-days BOD test and that in a laboratory scale submerged biofilter with continuous operation is suggested to evaluate the biological removability of organic pollutants contained in wastewater. A novel concept to select the appropriate treatment process of an industrial wastewater based on properties such as the molecular size and biodegradability of the pollutants contained in that wastewater is also proposed. To give basic information for the minimization of energy consumption in wastewater treatment, various biological wastewater treatment processes are compared from the view point of power economy.

scholarly journals Study of Physico-Chemical Characteristics of Wastewater in an Urban Agglomeration in Romania

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Paula Popa ◽  
Mihaela Timofti ◽  
Mirela Voiculescu ◽  
Silvia Dragan ◽  
Catalin Trif ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Correlation Analysis ◽  
Inorganic Compounds ◽  
Chemical Characteristics ◽  
Spectrophotometric Methods ◽  
Physico Chemical ◽  
Wastewater Pollution ◽  
Biogenic Compounds

This study investigates the level of wastewater pollution by analyzing its chemical characteristics at five wastewater collectors. Samples are collected before they discharge into the Danube during a monitoring campaign of two weeks. Organic and inorganic compounds, heavy metals, and biogenic compounds have been analyzed using potentiometric and spectrophotometric methods. Experimental results show that the quality of wastewater varies from site to site and it greatly depends on the origin of the wastewater. Correlation analysis was used in order to identify possible relationships between concentrations of various analyzed parameters, which could be used in selecting the appropriate method for wastewater treatment to be implemented at wastewater plants.

Polyacrylamide Based Polymers: Smart Materials Used in Wastewater Treatment

2020 ◽  
Vol 12 (1) ◽  
pp. 105-107 ◽  
Author(s):  
Amar Nath ◽  
P. P. Pande
Keyword(s):  
Wastewater Treatment ◽  
Smart Materials ◽  
Chemical Properties ◽  
Industrial Effluents ◽  
Solid Residue ◽  
Natural Polymers ◽  
High Affinity ◽  
Physico Chemical ◽  
Materials Used ◽  
Very High

Now-a-days synthetic polyelectrolytes are frequently used by the industries in the treatment of industrial effluents. Such materials have a variety of properties such as easily changeable structure as per the specific requirement, higher purity, highstability and have more efficiency than the natural polymers. These polymers do not add any solid residue in the sludge, exhibit no change in the physico-chemical properties of the treated water and therefore this water may be recycled. Polyacrylamide is a synthetic polyelectrolyte which is hydrophilic in nature and insoluble in organic solvents. It has very high affinity towards the suspended particles present in water. Therefore, polyacrylamide based polymers are highly effective for the flocculation of suspended contaminated particle present in the effluents. Polyacrylamide is very important polymer for wastewater treatment which enhances the flocculation potential by modification of its nature into non-ionic, anionic and cationic forms.

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