scholarly journals Photocatalysis in the treatment and disinfection of water. Part I. Theoretical backgrounds / Fotokataliza w oczyszczaniu i dezynfekcji wody część i. podstawy teoretyczne

2012 ◽  
Vol 19 (4) ◽  
pp. 489-512 ◽  
Author(s):  
Michał Bodzek ◽  
Mariola Rajca
Keyword(s):  
Low Cost ◽  
Membrane Reactors ◽  
Treatment Technology ◽  
Water And Wastewater Treatment ◽  
Wastewater Treatment Process ◽  
Photocatalytic Reactor ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology ◽  
Persistent Organic Compounds ◽  
Water And Wastewater

Abstract Photocatalysis process belongs to an advanced oxidation technology for the removal of persistent organic compounds and microorganisms from water. It is the technology with a great potential, a low-cost, environmental friendly and sustainable treatment technology to align with the “zero” waste scheme in the water/wastewater industry. At present, the main technical barriers that impede its full commercialization remained on the post-recovery of the catalyst particles after water treatment. This paper reviews the background of the process and photooxidation mechanisms of the organic pollutants and microorganisms. The review of the latest progresses of engineered-photocatalysts, photo-reactor systems, and the kinetics and modeling associated with the photocatalytic and photodisinfection water and wastewater treatment process, has been presented. A number of potential and commercial photocatalytic reactor configurations are discussed, in particular the photocatalytic membrane reactors. The effects of key photo-reactor operation parameters and water quality on the photoprocess performances in terms of the mineralization and disinfection are assessed.

The Nanofiltration Technology of Metoprolol in the Water Environment

2014 ◽  
Vol 955-959 ◽  
pp. 1013-1019
Author(s):  
Xin Miao Wang ◽  
Hai Yan Yang
Keyword(s):  
Ionic Strength ◽  
Removal Rate ◽  
Water Environment ◽  
Influence Factors ◽  
Advanced Treatment ◽  
Organic Micropollutants ◽  
Treatment Technology ◽  
Water And Wastewater Treatment ◽  
New Type ◽  
Water And Wastewater

Metoprolol (MET) is a common kind of Pharmaceuticals and personal care products (PPCPs), which belongs to a new type of organic micropollutants. And conventional water and wastewater treatment technology cannot remove the MET effectively, so it is necessary to adopt nanofiltration technology for advanced treatment. The influence factors on removal of Metoprolol (MET) in water by nanofiltration are mainly investigated in the study. According to the results, the removal rate of MET by nanofiltration all can reach more than 99% with the initial concentration increasing. Then the removal rate of MET by nanofiltration at different pressure values, pH, salt ionic strength conditions are also studied. The results have shown that the removal rate is increasing from 90.0% to about 99.0% while pressure goes up. When pH=5, the removal rate of MET by nanofiltration is slightly increasing. And the removal rate is decreasing from more than 98.0% to more than 92.0% with salt ionic strength increasing.

scholarly journals Research Status and Countermeasures of photocatalyst in Water Pollution Treatment

2021 ◽  
Vol 233 ◽  
pp. 01128
Author(s):  
Junye Li
Keyword(s):  
Water Pollution ◽  
Water Resources ◽  
Natural Resources ◽  
Treatment Method ◽  
Treatment Technology ◽  
Urgent Task ◽  
Pollution Treatment ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology ◽  
Positive Effect

With economic development and population growth, the demand for fresh water resources is also increasing. However, affected by sewage discharge from industry, agriculture, mining and domestic, not only the ecological environment and natural resources are seriously damaged, but also the water resources available for people to drink are decreasing day by day. How to improve the water pollution treatment technology has become an urgent task. Because of the high cost and great limitation, the traditional treatment method has no significant effect in water pollution control. As an advanced oxidation technology, photocatalyst can effectively degrade pollutants in water pollution, and has a positive effect on improving water quality, protecting natural resources and maintaining ecological balance.

scholarly journals Methylene Blue removal from aqueous solutions by activated carbon prepared from N. microphyllum (AC-NM): RSM analysis, isotherms and kinetic studies

2017 ◽  
Vol 19 (4) ◽  
pp. 697-705 ◽  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Low Cost ◽  
Kinetic Studies ◽  
P Value ◽  
Water And Wastewater Treatment ◽  
Freundlich Model ◽  
Initial Concentration ◽  
Layer Adsorption ◽  
Water And Wastewater

This study was conducted to remove Methylene Blue (MB) from aqueous solution using activated carbon prepared from N. microphyllum (AC-NM) as a new, cheap, and non-toxic. Design of experiments based on Response Surface Methodology (RSM) conducted to investigate the effect of variables namely; initial dye concentration, pH, contact time and absorbent dosage. An empirical model was developed applying ANOVA analysis. The interaction effects of all factors and their optimization have been carried out using RSM. Dye removal efficiency increased to more than 90% with increasing pH and initial concentration of dye from 3 to 11 and 10 to 210 mg/L, respectively under 1.1 to 1.4 g/L of absorbent dosage. Among factors, initial concentration of MB known as an important factor with P- value <0.0001. The experimental data are fitted with Freundlich model based on multi layer adsorption states (R2=0.99). The adsorption kinetics well described by second order model with R2 = 0.98. This novel absorbent has different advantages such as low cost, high ability to absorb pollutants and easily available that can be suggested for water and wastewater treatment.

scholarly journals Numerical modelling of a three-phase internal air-lift circulating photocatalytic reactor

2017 ◽  
Vol 76 (11) ◽  
pp. 3044-3053 ◽  
Author(s):  
Minghan Luo ◽  
Qiuwen Chen ◽  
Taeseop Jeong ◽  
Jing Chen
Keyword(s):  
Low Cost ◽  
Scale Up ◽  
Influential Factors ◽  
Phase Flow ◽  
Reactor Performance ◽  
Water And Wastewater Treatment ◽  
Photocatalytic Reactor ◽  
Three Phase ◽  
Three Phase Flow ◽  
Air Lift

Abstract The photocatalytic degradation process has been recognized as a low-cost, environmentally friendly and sustainable technology for water and wastewater treatment. As a key carrier of the photocatalytic process, the semiconductor TiO2 has been used in many studies. Analysis and modelling of hydrodynamics in the three-phase flow system can provide useful information for process design, operation and optimization of the three-phase flow photocatalytic reactor, which requires research on the mixing and flow characteristics of the interphase regions in the reactor. In this study, we modelled the hydrodynamics in an internal air-lift circulating photocatalytic reactor using an Eulerian multi-fluid approach. Localized information on phase holdup, fluid flow patterns and mixing characteristics was obtained. The simulation results revealed that the distribution of solid particle concentration depends on the flow field in the internal air-lift circulating photocatalytic reactor. The distance between the draft tube and wall of the reactor and changes in the superficial gas velocity (Ug) were found to be influential factors in reactor performance. The computational model developed could support optimizing reactor design to improve the hydrodynamics and provide guidance for scale-up.

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