Powder Photocatalysts: Characterization by Isotopic Exchanges and Photoconductivity; Potentialities for Metal Recovery, Catalyst Preparation and Water Pollutant Removal

1988 ◽  
pp. 399-424 ◽  
Author(s):  
Pierre Pichat
Keyword(s):  
Catalyst Preparation ◽  
Metal Recovery ◽  
Pollutant Removal ◽  
Water Pollutant

scholarly journals Selenium in wastewater can be adsorbed by modified natural zeolite and reused in vegetable growth

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110198
Author(s):  
Xiao Zhang ◽  
Xinyuan Li ◽  
Zihao Jin ◽  
Sadam Hussain Tumrani ◽  
Xiaodong Ji
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Soil Improvement ◽  
Pollutant Removal ◽  
Maximum Adsorption Capacity ◽  
Selenium Content ◽  
Water Release ◽  
Soil Release ◽  
Release Ratio ◽  
Water Pollutant

Modified natural zeolites (MNZ) are widely used in pollutant removal, but how to address these MNZ that have adsorbed pollutants must be considered. Selenium is an essential trace element for metabolism and is also a water pollutant. Selenium is adsorbed in the water by MNZ in this study first. Then the Brassica chinensis L. was planted in the soil which contains the MNZ loaded with selenium (MNZ-Se) to explore selenium uptake. MNZ-Se release tests in water and soil were also considered. The results showed the following: (1) The maximum adsorption capacity of MNZ for selenium is 46.90 mg/g. (2) Water release experiments of MNZ-Se showed that regardless of how the pH of the aqueous solution changes, the trend of the release of selenium from MNZ-Se in aqueous solution is not affected and first decreases before stabilizing. (3) Soil release experiments of MNZ-Se showed that the selenium content in the soil increased and reached the concentration in the standard of selenium-rich soil. Addition amount and soil pH value will affect the release ratio. The release ratio of MNZ-Se in the water was higher than that in the soil. (4) With an increase in the soil MNZ-Se content, the selenium content in the soil and B. c increases. Above all, MZN can be a good medium for water pollutant removal and soil improvement.

scholarly journals Modeling for Mitigating Storm Water Unban Flooding and Water Quality Issues by Using Small Serial Dams: A Case Study of the City of San Angelo

2021 ◽  
Keyword(s):  
Water Quality ◽  
Peak Flow ◽  
Pollutant Removal ◽  
Storm Water ◽  
Coefficient Of Determination ◽  
Event Mean Concentration ◽  
Flow Reduction ◽  
Pollutant Reduction ◽  
Water Pollutant ◽  
The City

<p>The City of San Angelo has been imposed on urban flooding and no-point source pollution and develop storm water monitoring and modeling project for managing these storm water issues. This study focuses on the stormwater peak flow reduction and water pollutant improvement by using small serial retention structures. The storm water data collected are utilized to verify storm water and event mean concentration in SWMM model. The verified SWMM that has range from 0.6 to 0.8 of coefficient of determination is modeled to evaluate small serial dams for reducing peak flow and water quality loading. Small serial dams explain the 26%~55.3% peak flow reduction and 53.2%~93.7% water pollutant removal percent. Sensitivity analysis results for three kinds of orifice sizes provide that smaller size increases the hydraulic retention and reduces the peak flow than other bigger size while the bigger size shows effective water pollutant reduction than small size.</p>

scholarly journals Synthesis and Impregnation of Copper Oxide Nanoparticles on Activated Carbon through Green Synthesis for Water Pollutant Removal

2017 ◽  
Vol 21 (1) ◽  
Author(s):  
Josiane Peternela ◽  
Marcela Fernandes Silva ◽  
Marcelo Fernandes Vieira ◽  
Rosângela Bergamasco ◽  
Angélica Marquetotti Salcedo Vieira
Keyword(s):  
Activated Carbon ◽  
Copper Oxide ◽  
Green Synthesis ◽  
Copper Oxide Nanoparticles ◽  
Pollutant Removal ◽  
Oxide Nanoparticles ◽  
Water Pollutant

scholarly journals Pulsed Discharge Plasma in Slug-flow Reactor System for Water Pollutant Removal and Nanoparticle Synthesis

2021 ◽  
Vol 25 (9) ◽  
pp. 1-17
Author(s):  
Wahyudiono Wahyudiono ◽  
Siti Machmudah ◽  
Hideki Kanda ◽  
Yaping Zhao ◽  
Motonobu Goto
Keyword(s):  
Slug Flow ◽  
Discharge Plasma ◽  
Flow Reactor ◽  
Nanoparticle Synthesis ◽  
Pollutant Removal ◽  
Reactor System ◽  
Pulsed Discharge ◽  
Water Pollutant ◽  
Pulsed Discharge Plasma

Comparison of drinking water pollutant removal using a nanofiltration pilot plant powered by renewable energy and a conventional treatment facility

Desalination ◽  
2014 ◽  
Vol 347 ◽  
pp. 94-102 ◽  
Author(s):  
N. García-Vaquero ◽  
Eunkyung Lee ◽  
R. Jiménez Castañeda ◽  
Jaeweon Cho ◽  
J.A. López-Ramírez
Keyword(s):  
Drinking Water ◽  
Renewable Energy ◽  
Pilot Plant ◽  
Conventional Treatment ◽  
Pollutant Removal ◽  
Treatment Facility ◽  
Water Pollutant

AN INTRODUCTION TO FLOATING TREATMENT WETLANDS AND ITS APPLICATION POTENTIAL FOR REMEDIATION OF CITARUM WATERSHED, INDONESIA

2016 ◽  
Vol 78 (4-2) ◽  
Author(s):  
Indriatmoko Indriatmoko ◽  
Raden Pandoe Prahoro
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Cost Effective ◽  
Pollutant Removal ◽  
Treatment Wetlands ◽  
Aquatic Area ◽  
Application Potential ◽  
Water Pollutant ◽  
Floating Treatment Wetlands ◽  
Physical And Chemical

Floating Treatment Wetlands (FTWs) are considered the most applicable and cost effective instrument for aquatic pollutant removal. This aquaponic–based bioremediation has become a potential alternative solution since inorganic (physical and chemical) treatment is seen to be ineffective for large–scale polluted objects. Numerous investigations have proved that FTWs are potential to decrease major pollutant concentration in water e.g., nitrogen, phosphate, as well as heavy metals. This treatment is applicable by using different macrophytes species. Depending on its pollutant target, the use of macrophytes will vary to its pollutant which will be removed. There are only limited reports available relating to application of macrophytes as pollutant removal applied in Indonesia. Citarum watershed is known as one of the most polluted aquatic area in Indonesia. It urgently needs a suitable method of water pollutant removal in this area. This paper aims to describe the application of FTWs as one of remediation methods that harnesses a significant potential because of its low-cost, eco-friendly, and sustainable nature for water restoration. 

scholarly journals Highly Robust and Selective System for Water Pollutants Removal: How to Transform a Traditional Photocatalyst into a Highly Robust and Selective System for Water Pollutants Removal

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1509 ◽  
Author(s):  
Olga Sacco ◽  
Vincenzo Vaiano ◽  
Christophe Daniel ◽  
Wanda Navarra ◽  
Vincenzo Venditto
Keyword(s):  
Photocatalytic Activity ◽  
Large Scale ◽  
High Efficiency ◽  
Pollutant Removal ◽  
Water Pollutants ◽  
Selective System ◽  
Marked Selectivity ◽  
Acidic Conditions ◽  
Pollutants Removal ◽  
Water Pollutant

Highly porous monolithic aerogels based on ZnO photocatalyst and syndiotactic polystyrene (s-PS) were obtained by supercritical CO2 treatment of ZnO/s-PS gels. The prepared aerogels were characterized and their photocatalytic activity was evaluated using phenol and toluene as water pollutant models. The s-PS nanoporous crystalline phase, able to absorb pollutant molecules, was proven to be necessary to ensure high photocatalytic efficiency as the aerogel acts not only as a support, but also as pollutant pre-concentrator. The reusability of ZnO/s-PS aerogels is also strong showing no decrease in photocatalytic activity after six consecutive degradation trials. Finally, the aerogel matrix prevents ZnO dissolution occurring under acidic conditions and promotes a selective removal of the pollutants. The synergy between the photocatalyst and the innovative polymeric support provides the composite system with robustness, chemical stability, easy recovery after treatment, high efficiency of pollutant removal with a marked selectivity which make these materials promising for large scale applications.

scholarly journals Removal of COD and Ammonia Nitrogen by a Sawdust/Bentonite-Augmented SBR Process

2018 ◽  
Vol 1 (1) ◽  
pp. 125-140 ◽  
Author(s):  
Parsa Mohajeri ◽  
Mohammad Selamat ◽  
Hamidi Abdul Aziz ◽  
Carol Smith
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Operation Time ◽  
Cost Effective ◽  
Ammonia Nitrogen ◽  
Aeration Rate ◽  
Pollutant Removal ◽  
Contact Period ◽  
Water Pollutant

Water pollutant removal by biomass adsorbent has been considered innovative and cost-effective, and thus commendable for application in industry. However, certain important aspects have been overlooked by researchers, namely the efficiency in the operation time and pollutant removal. In this research, landfill leachate samples with organic components were treated using a bentonite-enriched sawdust-augmented sequencing batch reactor (SBR) process. By modifying the pH, the sawdust samples were categorized into three groups: the acidic, the alkaline, and the neutral. To bentonite samples, the pH-adjusted sawdust was added at 10%, 20%, and 30% amounts by mass, respectively. At the optimum aeration rate of 7.5 L/min and contact period of 22 h, the treatment achieved 99.28% and 95.41% removal of chemical oxygen demand (COD) and NH3-N with bentonite, respectively. For both pollutants, in the presence of sawdust, the removal was only reduced by about 17% with the contact period reduced to 2 h, which was a considerable achievement.

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