A simple technique for water disinfection with hydrodynamic cavitation: Effect on survival of Escherichia coli

Desalination ◽  
2009 ◽  
Vol 248 (1-3) ◽  
pp. 152-159 ◽  
Author(s):  
L. Mezule ◽  
S. Tsyfansky ◽  
V. Yakushevich ◽  
T. Juhna
Keyword(s):  
Escherichia Coli ◽  
Simple Technique ◽  
Water Disinfection ◽  
Hydrodynamic Cavitation ◽  
Cavitation Effect

scholarly journals Treatment of fish processing industry wastewater using hydrodynamic cavitational reactor with biodegradability improvement

2019 ◽  
Vol 80 (12) ◽  
pp. 2310-2319 ◽  
Author(s):  
Prashant Dhanke ◽  
Sameer Wagh ◽  
Abhijeet Patil
Keyword(s):  
Organic Matter ◽  
New Technology ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Hydrodynamic Cavitation ◽  
Inlet Pressure ◽  
Fish Processing ◽  
Processing Industry ◽  
Cavitation Effect ◽  
Processing Plants

Abstract Water generated from the fish processing industry is contaminated with organic matter. This organic matter present in wastewater increases the biochemical oxygen demand (BOD) and chemical oxygen demand (COD). A new technology, hydrodynamic cavitation (HC) is used to deal with this wastewater produced in fish processing plants. The orifice plate is used in the HC reactor to generate a cavitation effect. The intensification of this technique was carried out with the help of hydrogen peroxide (H2O2) and TiO2. The treatment of this wastewater is reported in terms of percent degradation in BOD and COD and in biodegradability index (BI). Operating parameters like inlet pressure, pH, operating temperature and H2O2 doses were used to find the optimum condition. 15 g/L of H2O2 gave 69.5% reduction of COD in the 120 min of treatment that also increases BI value to 0.93 at inlet pressure 8 bar, Plate-5, temperature (30 °C), and pH 4. In the ultrasonic cavitation (UC) reactor, COD reduction is 68.7% without TiO2 and with TiO2 it is 71.2%. Also, this HC and UC reactor reduced CFU count to a great extent at the same operating conditions.

scholarly journals PIV Analysis of Cavitating Flow Behind Square Multi-Orifice Plates

10.29007/fhdg ◽  
2018 ◽  
Author(s):  
Zhiyong Dong ◽  
Wenqian Zhao
Keyword(s):  
Conventional Technique ◽  
Disinfection Byproducts ◽  
Cavitating Flow ◽  
Water Disinfection ◽  
Hydrodynamic Cavitation ◽  
Pathogenic Microorganisms ◽  
Turbulence Structures ◽  
Image Velocimetry ◽  
Piv Analysis ◽  
Mutagenic Effects

Currently, in water supply engineering, the conventional technique of disinfection by chlorination is used to kill pathogenic microorganisms in raw water. However, chlorine reacts with organic compounds in water and generates disinfection byproducts (DBPs) such as trihalomethanes (THMs), haloacetic acids (HAAs) etc. These byproducts are of carcinogenic, teratogenic and mutagenic effects, which seriously threaten human health. Hydrodynamic cavitation is a novel technique of drinking water disinfection without DBPs. Turbulence structures of cavitating flow were observed by the Particle Image Velocimetry (PIV) technique in a self-developed hydrodynamic cavitation device due to square multi- orifice plates, including effects of orifice number and orifice layout on velocity distribution, turbulence intensity and Reynolds stress, which aimed at uncovering mechanism of killing pathogenic microorganisms by hydrodynamic cavitation.

scholarly journals Efficacy of a solar still in destroying virus and indicator bacteria in water for human consumption

2018 ◽  
Vol 13 (4) ◽  
pp. 1
Author(s):  
Felipe Tiago do Nascimento ◽  
Carlos Augusto do Nascimento ◽  
Fernando Rosado Spilki ◽  
Rodrigo Staggemeier ◽  
Cláudio Marcos Lauer Júnior
Keyword(s):  
Escherichia Coli ◽  
Human Adenovirus ◽  
Adenovirus Type ◽  
Pilot Scale ◽  
Total Coliform ◽  
Water Disinfection ◽  
Most Probable Number ◽  
Human Consumption ◽  
Solar Still ◽  
Probable Number

Natural water distillation can destroy and/or inactivate microorganisms that are sensitive to heat and ultraviolet radiation (UV). This method is currently used to provide fresh water in ships and in the desalination of brackish water. For the development of this research, a pilot-scale solar still was built and installed in the southern region of Brazil, in order to assess its efficiency in water disinfection, which was based on the most probable number (MPN) of total coliforms and  Escherichia coli, in addition to the DNA copy number of human adenovirus type 5 (HAdV-5) in raw, undistilled samples and in treated distilled water. Results showed that the distillation process removed 100% of total coliform and Escherichia coli and 4.5 log (99.997%) of HAdV-5, which meets the microbiological standards for drinking water according to national Brazilian regulations, as well as USEPA and HEALTH CANADA requirements.

A Standard Test for Efficacy of Germicides and Acceptability of Residual Disinfecting Activity in Swimming Pool Water

1964 ◽  
Vol 47 (3) ◽  
pp. 540-547 ◽  
Author(s):  
L F Ortenzio ◽  
L S Stuart
Keyword(s):  
Escherichia Coli ◽  
Standard Test ◽  
Water Disinfection ◽  
Swimming Pool ◽  
Biological Test ◽  
Streptococcus Faecalis ◽  
Pool Water ◽  
Test Organisms ◽  
Swimming Pool Water

Abstract A biological test, using Escherichia coli and Streptococcus faecalis as test organisms, has been designed to determine the germicidal activity of water containing 0.4— 1.0 ppm of available chlorine at pH 7.0— 7.5. The few results presented clearly indicate the usefulness of the method in evaluating commercial disinfectant preparations recommended for use in swimming pool water disinfection. The procedure can be readily adapted to study the effects of chlorine stabilizers, the influence of various algaecides applied as adjuncts to water disinfectant on germicidal activity, and determinations as to the acceptability of residual disinfecting activity of swimming pool waters during times that the pool is in use.

Influence of pyrolytic seeds on ZnO nanorod growth onto rigid substrates for photocatalytic abatement of Escherichia coli in water

2014 ◽  
Vol 14 (6) ◽  
pp. 1087-1094 ◽  
Author(s):  
Luis Sanchez ◽  
Lucas Guz ◽  
Pilar García ◽  
Silvia Ponce ◽  
Silvia Goyanes ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antibacterial Activity ◽  
Zno Nanorods ◽  
Water Disinfection ◽  
Acetate Solution ◽  
Ethanol Mixture ◽  
E Coli ◽  
The Relationship ◽  
Nanorod Growth

ZnO nanorods (ZnO NRs) were grown on ZnO seeded fluorine doped tin oxide (FTO) substrates at low temperatures (90 °C) from Zn2+ precursors in alkaline aqueous solution. The ZnO seeds were deposited on the FTO substrate heated at 350 °C by spray pyrolysis of a zinc acetate solution in a water ethanol mixture. The structure of seeds was tuned by the ethanol water ratio, Γ, which controls the solvent evaporation rate of drops impinging the substrate. The relationship between the microstructure and optical properties of the ZnO NR films and the photocatalytic antibacterial activity for Escherichia coli abatement, was determined through a detailed characterization of the material. The higher photocatalytic antibacterial activity was performed by ZnO NR films grown on seeds deposited from solutions with Γ in the 0.0–0.03 range. With these films, the population of viable E. coli dropped more than six orders, from 8 × 108 to 4 × 102 CFU. These results show the potential of these materials in water disinfection.

Surface Quality Investigation of Nanoparticle Colloid Hydrodynamic Cavitation Jet Polishing Technology

2011 ◽  
Vol 487 ◽  
pp. 332-336 ◽  
Author(s):  
Yong Zhang ◽  
Xing Wang ◽  
Fei Hu Zhang ◽  
Ming Zhou
Keyword(s):  
Surface Quality ◽  
Interface Reaction ◽  
Hydrodynamic Cavitation ◽  
Processing Efficiency ◽  
Surface Machining ◽  
Cavitation Effect ◽  
Swirling Jet ◽  
The Common ◽  
Nanoparticle Colloid

Nanoparticle colloid hydrodynamic cavitation jet polishing (HCJP) is a supersmooth surface machining technology that utilizes the interface reaction to remove material from workpiece, applying the cavitation effect to improve the processing efficiency. In this paper, a plototype equipment of HCJP is introduced and the experiment of HCJP and common jet polishing has been done. The experiment results indicate that in both cases, the processed area presents the orbicular structure of “W” shape when the angle of jet and horizon is 90°; the position that has the best surface quality located on the annulus of processing region where the most material removed. Compared with the common jet polishing, the surface quality processed by HCJP that uses the swirling jet is better. In processing experiment of HCJP, the supersmooth surface with roughness of Ra 0.758nm is obtained.

Ag and Cu loaded on TiO2/graphite as a catalyst for Escherichia coli-contaminated water disinfection

2010 ◽  
Vol 64 (5) ◽  
Author(s):  
Fitria Rahmawati ◽  
Triana Kusumaningsih ◽  
Anita Hapsari ◽  
Aris Hastuti
Keyword(s):  
Escherichia Coli ◽  
Tio2 Film ◽  
Water Disinfection ◽  
Graphite Substrate ◽  
Ammonium Bromide ◽  
Contaminated Water ◽  
Titanium Hydroxide ◽  
E Coli ◽  
Cetyl Trimethyl Ammonium ◽  
Cbd Method

AbstractTiO2 film was synthesized by means of the chemical bath deposition (CBD) method from TiCl4 as a precursor and surfactant cetyl trimethyl ammonium bromide (CTAB) as a linking and assembling agent of the titanium hydroxide network on a graphite substrate. Ag and Cu were loaded on the TiO2 film by means of electrodeposition at various applied currents. Photoelectrochemical testing on the composite of Ag-TiO2/G and Cu-TiO2/G was used to define the composite for Escherichia coli-contaminated water disinfection. Disinfection efficiency and the rate of disinfection of E. coli-contaminated water with Ag-TiO2/G as a catalyst was higher than that observed for Cu-TiO2/G in all disinfection methods including photocatalysis (PC), electrocatalysis (EC), and photoelectrocatalysis (PEC). The highest rate constant was achieved by the PEC method using Ag-TiO2/G, k was 6.49 × 10−2 CFU mL−1 min−1. Effective disinfection times of 24 h (EDT24) and 48 h (EDT48) were achieved in all methods except the EC method using Cu-TiO2/G.

Bubble behavior in hydrodynamic cavitation: Effect of turbulence

AIChE Journal ◽  
1997 ◽  
Vol 43 (6) ◽  
pp. 1641-1648 ◽  
Author(s):  
Vijayanand S. Moholkar ◽  
Aniruddha B. Pandit
Keyword(s):  
Hydrodynamic Cavitation ◽  
Bubble Behavior ◽  
Cavitation Effect
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