Disinfection of water containing Escherichia coli by use of a compound parabolic concentrator: effect of global solar radiation and reactor surface treatment

Abstract

Effects of photocatalytic and solar disinfection on Escherichia coli K12 (TISTR 780) are examined. Experiments were conducted with titanium dioxide (TiO 2 ) as catalyst, coated on plates by thermal spraying, with global solar illumination. Inactivation of E. coli as a function of time was conducted to find the rate of inactivation of the bacteria. The results revealed that the solar disinfection in the absence of the catalyst plates did not significantly affect the rate of inactivation of the bacteria when increasing the reactor surface area of solar illumination. Black reactor surfaces were slightly more affected when increasing the area of the reactor surface. However, the catalyst reactor surface had the greatest effect on inactivation of the bacteria when the reactor surface area was increased. Water temperature less than 45°C did not affect the decrease in the rate of inactivation of the bacteria for either solar or photocatalytic disinfection.

Thermal-Sprayed Photocatalytic Coatings for Biocidal Applications: A Review

“…According to Bettini, an anatase/rutile mixed-phase photocatalyst was reported in the form of nanostructured powders by flame spray pyrolysis (FSP) method (Ref 79 ), which showed photocatalytic activity under sole visible light, indicating the potential of the FSP-made powders as indoor photocatalysts for disinfection purposes. A more practical study by M. Nararom et al was conducted using a thermal-sprayed TiO 2 coating on plates (Ref 80 ). A parabolic concentrator to enhance the power density of the solar radiation for the disinfection of water containing E. coli.…”

Wastewater reuse in agriculture and health risk in Vietnam

“…In this type of reactor water enters one end and slowly travels through a long narrow reactor tube while the system is exposed to sunlight. There is typically some form of metallic concentrator behind the reactor tube to increase the amount of sunlight entering the reactor tube (Navntoft et al, 2008;Ubomba-Jaswa et al, 2010;Bigoni et al, 2012;Bigoni et al, 2014;Nararom et al, 2015). Solar mirrors can be applied to batch and flow through systems to increase the radiation absorbed by the water; mirrors can be parabolic, compound parabolic, or V shaped.…”

Highly Efficient Antimicrobial Activity of CuxFeyOz Nanoparticles against Important Human Pathogens

“…The inorganic antimicrobial materials can be divided into two major categories based on their action mechanisms—the photocatalytic antimicrobial materials (activated by light), and nanomaterials that can directly lead to bacteria elimination or death (direct antimicrobial nanomaterials). Due to the advanced oxidation processes induced by photocatalytic properties, metal oxide-based photocatalytic nanomaterials have shown great promise as effective non-targeted disinfectants against a wide range of microorganisms and the decomposition of chemical contaminants [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. The requirement of different wavelengths of light to activate the bactericidal activity of these materials has pros and cons; on one hand, light can be used to control the activity of the materials, and on the other hand, the nature of the materials limits the use of the light, the system requires additional accessories to generate light, and the material is not effective for applications in dark environments.…”