scholarly journals Study on the Removal of Thiosulfate from Wastewater by Catalytic Oxidation

2019 ◽  
Vol 9 (2) ◽  
pp. 4053-4056
Author(s):  
A. Z. Al-Khazaal ◽  
F. Ahmad ◽  
N. Ahmad
Keyword(s):  
Catalytic Oxidation ◽  
Food Processing ◽  
Oxygen Demand ◽  
Chemical Plants ◽  
Mining Operations ◽  
Industrial Plants ◽  
Processing Plants ◽  
Uv Visible ◽  
Petroleum Refineries ◽  
Thiosulfate Concentration

Wastewater streaming from industrial plants, including petroleum refineries, chemical plants, pulp and paper plants, mining operations, electroplating operations, and food processing plants, can contain offensive substances such as cyanide, sulfides, sulfites, thiosulfates, mercaptans and disulfides that tend to increase the chemical oxygen demand (COD) of the streams. In the present work, removal of thiosulfate from wastewater by catalytic oxidation using aluminum oxide as a catalyst was studied. Four main factors were considered, namely the initial thiosulfate concentration, the hydrogen peroxide concentrations, the amount of the catalyst and the operating temperatures. The analysis of thiosulfate and sulfate was carried out by using UV Visible Spectrophotometer. An empirical rate equation was developed.

scholarly journals Treatment of high-strength liquid wastes by auto-thermal aerobic digestion

2019 ◽  
pp. 339-348
Author(s):  
Peter F. Randerson ◽  
Timothy P. Higgins ◽  
Brian N. Dancer
Keyword(s):  
Food Processing ◽  
Waste Treatment ◽  
Liquid Waste ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Small Scale ◽  
Chemical Plants ◽  
Aerobic Digestion ◽  
Wood Processing ◽  
Wide Range

Auto-thermal aerobic digesters comprise a simple, robust, inexpensive technologyappropriate for on-site liquid waste treatment by small- and medium-sized enterprises.They have been shown to be effective at treating a wide range of effluents and liquorsarising from food processing and chemical plants, especially those with high levels ofbiological oxygen demand (BOD), or for small-scale sewage treatment.Liquid circulates around the reactor vessel by pumping through a venturi nozzle, whichdraws air into the flow. As the microbial community develops, the system self-heats andorganic matter is removed as CO2, NH3 and water. The temperature of the insulatedvessel may rise to 55e°C or more as the thermophilic community becomes established.BOD levels typically reduce by 90% over a 3-5 day residence time. Auto-thermal aerobicdigestion (ATAD) acts faster than mesophilic or anerobic degradation and is veryresistant to organic toxins (pentachlorophenol) or metal pollutants (Cu2+, Zn2+, Ni2J inthe waste.Examples are shown of wastes and liquors successfully treated by pilot-scale ATADsystems up to I 000 litres in size. These include effluents from food processing (icecream, chocolate, egg pasteurisation, brewing), chemical plants (wood processing,phenolic liquor) and silage pit effluent.Auto-thermal aerobic digestion offers a versatile, cost-effective solution for liquid wastetreatment in a climate of increasing demands from Regulatory Authorities and increasingcosts of conventional off-site waste disposal such as sewerage or landfill charges.

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.

Characterization of New Nonstoichiometric Ferroelectric (Li0.95Cu0.15)Ta0.76Nb0.19O3 and Comparative Study With (Li0.95Cu0.15)Ta0.57Nb0.38O3 as Photocatalysts in Microbial Fuel Cells

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
S. Louki ◽  
N. Touach ◽  
A. Benzaouak ◽  
V. M. Ortiz-Martínez ◽  
M. J. Salar-García ◽  
...  
Keyword(s):  
Power Density ◽  
Microbial Fuel Cells ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ferroelectric Material ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Uv Visible

This work investigates the photocatalytic activity of new ferroelectric material with formula (Li0.95Cu0.15)Ta0.76Nb0.19O3 (LT76) in a single chamber microbial fuel cell (MFC) and compares its performance with the similar photocatalyst (Li0.95Cu0.15)Ta0.57Nb0.38O3 (LT57). The photocatalysts LT76 and LT57 were synthesized by ceramic route under the same conditions, with the same starting materials. The ratio Ta/Nb was fixed at 4.0 and 1.5 for LT76 and LT57, respectively. These phases were characterized by different techniques including X-ray diffraction (XRD), transmission electronic microscopy (TEM), particle size distribution (PSD), differential scanning calorimetry (DSC), and ultraviolet (UV)–visible (Vis). The new photocatalyst LT76 presents specific surface area of 0.791 m2/g and Curie temperature of 1197 °C. The photocatalytic efficiency of this material is assessed in terms of wastewater treatment and electricity generation by power density and removal rate of chemical oxygen demand (COD) in the presence of a light source. The values of maximum power density and COD removal were 19.77 mW/m3 and 93%, respectively, for LT76.

scholarly journals Identification and Diagnosis of Fault in Consistent Mixed Tank Reactor using Neural System

2019 ◽  
Vol 8 (6) ◽  
pp. 2445-2449
Keyword(s):  
Fault Diagnosis ◽  
Food Processing ◽  
Nonlinear Process ◽  
Neural System ◽  
Chemical Processing ◽  
Tank Reactor ◽  
Processing Plants ◽  
Pharmaceutical Industries

The Consistent Mixed Tank Reactor is widely used in chemical processing plants, food processing industries and in pharmaceutical industries. The Consistent Mixed Tank Reactor is a nonlinear process. If any of inputs to the process or any parameters in the process gets changed means the entire working of the plant gets changed. And also it leads to decrease the accuracy of the final or end product. So, to get required end result the accuracy developed in the Consistent Mixed Tank Reactor process where the tank is in running condition need to be identified and necessary steps should be taken to avoid those fault. There are several fault diagnosis methods available. Among those techniques, the Neural System Prescient Controller can be utilized to identify and diagnose the error present inside Consistent Mixed Tank Reactor tank. From the Neural System Prescient Controller, the servo response is obtained to understand clearly about the behavior of the Consistent Mixed Tank Reactor tank process. Thus, by selecting suitable controlling techniques the accuracy of the desired product can be obtained in Consistent Mixed Tank Reactor tank.

Superhydrophobic Coatings on Electronic Components

2011 ◽  
Vol 2011 (1) ◽  
pp. 000113-000116
Author(s):  
Andrew Jones ◽  
Vinod Sikka
Keyword(s):  
Food Processing ◽  
Circuit Board ◽  
Electric Motors ◽  
Electronic Components ◽  
Electrical Circuits ◽  
Electrical Device ◽  
Superhydrophobic Coatings ◽  
Electrical Devices ◽  
Processing Plants ◽  
Device Applications

Superhydrophobic coatings provide exceptional protection to electrical circuits, switches, and other electrical devices which operate in wet environments, such as food processing plants or outdoor applications. Among various electrical device applications, electric motors and electrical switches have been successfully tested in the field at two food processors for nearly 20 months with exceptionally good results. Coated microelectronic circuit board has been in operation without any incidence for over 1 year.

WHAT THE SANITARIAN SHOULD KNOW ABOUT STAPHYLOCOCCI AND SALMONELLAE IN NON-DAIRY PRODUCTS.

1968 ◽  
Vol 31 (4) ◽  
pp. 110-116 ◽  
Author(s):  
Frank L. Bryan
Keyword(s):  
Food Processing ◽  
Dairy Products ◽  
Food Service ◽  
Infectious Agent ◽  
Control Measures ◽  
Processing Conditions ◽  
Inhibition Of Growth ◽  
Processing Plants ◽  
Prepared Food ◽  
Human Nose

After a review of the nature of staphylococci and staphylococcal enterotoxins including data on survival of these organisms under both natural and food processing conditions, the epidemiology of staphylococcal intoxications is discussed. The human nose is the main reservoir of Staphylococcus aureus. A number of circumstances must be fulfilled for foodborne staphylococcal intoxications to occur; these include: a reservoir for the infectious agent, a mode of dissemination of the organism, contamination of a food capable of supporting bacterial growth, enough time at a temperature which permits bacterial multiplication, and ingestion of sufficient amounts of staphylococcal enterotoxin by susceptible hosts. Control measures must be based on these circumstances. Principles of control, therefore, include limitation of contamination, inhibition of growth, and destruction of the organism. Control of staphylococcal intoxication must be emphasized at places foods are prepared (food processing plants, food-service establishments, and homes).

Catalytic oxidation with Al–Ce–Fe–PILC as a post-treatment system for coffee wet processing wastewater

2012 ◽  
Vol 66 (8) ◽  
pp. 1663-1668 ◽  
Author(s):  
Nancy R. Sanabria ◽  
Yury M. Peralta ◽  
Mardelly K. Montañez ◽  
Nelson Rodríguez-Valencia ◽  
Rafael Molina ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Oxidation ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Water Source ◽  
Post Treatment ◽  
Treatment System ◽  
Total Phenolic ◽  
Wet Processing ◽  
High Conversion Rate

The effluent from the anaerobic biological treatment of coffee wet processing wastewater (CWPW) contains a non-biodegradable compound that must be treated before it is discharged into a water source. In this paper, the wet hydrogen peroxide catalytic oxidation (WHPCO) process using Al–Ce–Fe–PILC catalysts was researched as a post-treatment system for CWPW and tested in a semi-batch reactor at atmospheric pressure and 25 °C. The Al–Ce–Fe–PILC achieved a high conversion rate of total phenolic compounds (70%) and mineralization to CO2 (50%) after 5 h reaction time. The chemical oxygen demand (COD) of coffee processing wastewater after wet hydrogen peroxide catalytic oxidation was reduced in 66%. The combination of the two treatment methods, biological (developed by Cenicafé) and catalytic oxidation with Al-Ce–Fe–PILC, achieved a 97% reduction of COD in CWPW. Therefore, the WHPCO using Al–Ce–Fe–PILC catalysts is a viable alternative for the post-treatment of coffee processing wastewater.

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