Electrostatic Precipitator Performance from the Point of View of Gas Treatment Time

1980 ◽  
Vol 30 (4) ◽  
pp. 395-396
Author(s):  
James H. Vincent
Keyword(s):  
Electrostatic Precipitator ◽  
Treatment Time ◽  
Point Of View ◽  
Gas Treatment

Effect of Chlorine Dioxide Gas Treatment on Surface Sterilization of Grape

2011 ◽  
Vol 236-238 ◽  
pp. 2939-2944 ◽  
Author(s):  
Ri Ya Jin ◽  
Shuang Qi Hu ◽  
Zhi Chao Chi
Keyword(s):  
Chlorine Dioxide ◽  
Treatment Time ◽  
Reducing Sugar ◽  
Gas Treatment ◽  
Surface Sterilization ◽  
Log Reduction ◽  
Chlorine Dioxide Gas ◽  
Spoilage Bacteria ◽  
Effect Of Chlorine

Experiments were conducted to investigate the effect of concentration and duration of chlorine dioxide gas treatment on Surface sterilization of grape at 25°C. The results showed that the values of inactivate bacterial log reduction ofBotrytis cinerea,Penicilliumandalternariaincreased with the increasing of ClO2gas concentrations and treatment time. When the concentrations and treatment time was about 10 mg/m3and 30 minutes, respectively, more than 4 log reduction was obtained for the three spoilage bacteria on grape surface. Furthermore, the effect of chlorine dioxide gas treatment on quality of grape was investigated. It was found that the contents of vitamin C (Vc) and reducing sugar (RS) in grape also increased compared with grape without ClO2gas treatment.

scholarly journals Arsenic in Chemical and Metallurgical Conversions of Copper-zinc Concentrates

2020 ◽  
Author(s):  
Evgeny Nikolaevich Selivanov ◽  
Dmitry Olegovich Novikov ◽  
Vyacheslav Vasi- Lyevich Belyaev ◽  
Gennady Veniaminovich Skopov
Keyword(s):  
Sulfuric Acid ◽  
Electrostatic Precipitator ◽  
Metallic Copper ◽  
Gas Treatment ◽  
Sulfuric Acid Production ◽  
Keywords Arsenic ◽  
Copper Zinc ◽  
Sulfide Concentrates ◽  
Impurity Elements

Due to the deterioration of the quality of obtained sulfide-copper concentrates, arsenic circulates and accumulates in the intermediate products, which reduces the quality of the metal and associated product – sulfuric acid. A method of estimation the distribution of impurity elements can be created using the recycling of sulfide concentrates by various technologies (including autogenous smelting, matte conversion and flotation of slags). This technique is based on solving balance equations for iron, copper and arsenic with known compositions of the resulting products. The obtained data were used to assess of the extraction of arsenic into produce outputs (slag, matte, dust, etc.). In this study, the concentration of arsenic in the dust of metallurgical processes and sludge for cleaning acid solutions is confirmed. The increased temperature in the electrostatic precipitator of gas purification of autogenous processes lead to a partial transition of arsenic into the gas stream directed to the sulfuric acid production. It is possible to regulate the fraction of transition of arsenic to dust and sulfuric acid while changing the operating temperature in the electrostatic precipitator. To a lesser extent arsenic is concentrated in the tails of flotation of slag (11.7%) and metallic copper (2.9%). These data are useful for substantiating measures for the wastes recycling and improvement of the ecological environment in the enterprise operating districts. Keywords: arsenic, autogenous melting, matte conversion, slag flotation, purified gas treatment, distribution, dust, sludge

Collection of Submicron Particles by Polyethylene Composite Materials Collector

2014 ◽  
Vol 919-921 ◽  
pp. 2030-2036
Author(s):  
Jing Cai Chang ◽  
Ai Ping Tao ◽  
Ming Feng Gao ◽  
Chun Yan Xu ◽  
Chun Yuan Ma
Keyword(s):  
Treatment Time ◽  
Collection Efficiency ◽  
Volume Resistivity ◽  
Submicron Particles ◽  
Effective Control ◽  
Water Addition ◽  
Gas Treatment ◽  
Drop Spreading ◽  
Addition Rate ◽  
The Relationship

Wet electrostatic precipitators (wet ESPs) are good options for effective control of PM2.5 emission. However, the common problems of uniform water film formed on rigid collector limited the applicability of typical wet ESPs, thus could be tend to cause "spark-over" and "back-corona". This research was designed to test the performance of the polypropylene fibrous as collection electrodes for PM2.5 control in wet ESP. Meanwhile, drop spreading feature and volume resistivity measurements of polypropylene fibrous collector were investigated. The results show that drop spreading existed in imbibitions experiments between hydrophobic fabrics contacted with water. The difference of spreading characteristics was accordance to the physical woven properties of fabrics. The relationship between the volume resistivity of polypropylene fibrous and the water addition rate has been investigated. The secondary current by polypropylene collection electrode was 5~20 percent higher than that by FRP. The average number collection efficiencies by polypropylene collector amounted to 89.21% for PM2.5 when the gas residence time was 1.33s at 60kV. The relationship between water addition rate and average number collection efficiency was not more regular than other factors such as gas treatment time or applied voltage.

Semi-Closed Gas Turbine/Combined Cycle With Water Recovery and Extensive Exhaust Gas Recirculation

1996 ◽  
Author(s):  
Bruno Facchini ◽  
Daniele Fiaschi ◽  
Giampaolo Manfrida
Keyword(s):  
Gas Turbine ◽  
Water Injection ◽  
Combined Cycle ◽  
Point Of View ◽  
Exhaust Gas ◽  
Water Recovery ◽  
Gas Treatment ◽  
High Level ◽  
Gas Recirculation ◽  
Gas Turbine Cycle

This innovative gas turbine cycle can offer several advantages over conventional cycles from the point of view of environmental friendship. The basic idea of SCGT/CC (Semi-Closed Gas Turbine/Combined Cycle with water recovery) is to cool down the exhaust temperatures to allow full condensation of the water vapor, and recirculate a large part of the exhaust gases to the compressor. The condensed water can then be reinjected by means of a pump at compressor delivery. The working gas composition is thus close to that corresponding to stoichiometric combustion, which opens the possibility of applying techniques for CO2 recycling and general exhaust gas treatment. An increase in work output is connected to water injection, while a high level of efficiency is maintained as the compressor work is reduced and the cycle parameters are tuned for the exhaust of this turbine.

scholarly journals STATISTICAL STUDY CONCERNING THE ORTHODONTISTS’ PERCEPTION OF THE CONVENTIONAL AND SELF-LIGATING BRACKET SYSTEMS

2021 ◽  
Vol 67 (2) ◽  
pp. 120-127
Author(s):  
Claudiu Vartolomei ◽  
◽  
Dan Șerbănoiu ◽  
Maria Dămășaru ◽  
Dorin Cocoș ◽  
...  
Keyword(s):  
Statistical Study ◽  
Treatment Time ◽  
International Community ◽  
Point Of View ◽  
The Other ◽  
Price Ratio ◽  
Two Systems ◽  
Conventional Brackets ◽  
Functional Point ◽  
Bonding Technique

Objective. To compare the conventional and self-ligating brackets systems from the point of view of the clinician. Material and methods. A survey was delivered to orthodontists from the international community (n = 130) in order to evaluate and compare different proprieties of the two systems. Results. Conventional brackets are preferred when it comes to bonding technique, final results from an aesthetic and functional point of view and quality-price ratio, while self-ligating brackets are elected for improved patient hygiene, less chairside time and reduced friction and global treatment time. Conclusions. Orthodontists currently use both systems in their practice and each of them has certain features which makes them superior in comparison to the other.

scholarly journals EXPERIMENTAL DETERMINATION OF OHMIC RESISTIVITY OF FLY ASH FOR DESIGN OF ELECTROSTATIC PRECIPITATORS

2005 ◽  
Vol 4 (2) ◽  
Author(s):  
M. Ozawa ◽  
J. I. Yanagihara
Keyword(s):  
Fly Ash ◽  
Electrostatic Precipitator ◽  
Particulate Material ◽  
Gas Treatment ◽  
Industrial Practice ◽  
Biomass Boiler ◽  
Electrostatic Precipitators ◽  
First Time ◽  
Made In

The objective of the present work is to determine the ohmic resistivity of fly ashes collected at electrostatic precipitators (ESPs) attached to boilers burning Brazilian coals. An experimental device to measure the fly ash resistivity was designed and constructed; tests were conducted according to accepted standards in other countries. It was the first time that this kind of measurement was conducted for Brazilian coals. The tested materials were collected from ESPs operating in the southern region of Brazil, where the mineral coal is commonly used. The ohmic resistivity of the tested materials was smaller compared to mineral coals from abroad. The resistivity of the fly ash increased when the temperature was raised, which is in accordance with reported results for mineral coals from abroad. Tests with particulate material collected from the electrostatic precipitator (ESP) of a biomass boiler showed that its ohmic resistivity is much lower than the resistivity of fly ash from the mineral coal. This means that the ESP for biomass boiler should be smaller, which is in accordance with the industrial practice. Based on the experimental results, practical comments about ESP sizing were made in order to assist engineers and technicians dealing with the problem of gas treatment in coal combustion.

scholarly journals Cold atmospheric plasma technology for removal of organic micropollutants from wastewater—a review

2021 ◽  
Vol 75 (11) ◽  
Author(s):  
Amit Kumar ◽  
Nikola Škoro ◽  
Wolfgang Gernjak ◽  
Nevena Puač
Keyword(s):  
Treatment Time ◽  
Degradation Kinetics ◽  
Synergetic Effect ◽  
Water Bodies ◽  
Atmospheric Plasma ◽  
Organic Micropollutants ◽  
Aquatic Life ◽  
Gas Treatment ◽  
Cold Atmospheric Plasma ◽  
Wide Range

Abstract Water bodies are being contaminated daily due to industrial, agricultural and domestic effluents. In the last decades, harmful organic micropollutants (OMPs) have been detected in surface and groundwater at low concentrations due to the discharge of untreated effluent in natural water bodies. As a consequence, aquatic life and public health are endangered. Unfortunately, traditional water treatment methods are ineffective in the degradation of most OMPs. In recent years, advanced oxidation processes (AOPs) techniques have received extensive attention for the mineralization of OMPs in water in order to avoid serious environmental problems. Cold atmospheric plasma discharge-based AOPs have been proven a promising technology for the degradation of non-biodegradable organic substances like OMPs. This paper reviews a wide range of cold atmospheric plasma sources with their reactor configurations used for the degradation of OMPs (such as organic dyes, pharmaceuticals, and pesticides) in wastewater. The role of plasma and treatment parameters (e.g. input power, voltage, working gas, treatment time, OMPs concentrations, etc.) on the oxidation of various OMPs are discussed. Furthermore, the degradation kinetics, intermediates compounds formed by plasma, and the synergetic effect of plasma in combination with a catalyst are also reported in this review. GraphicAbstract

scholarly journals Ultraviolet-C Light Effect on the Physicochemical and Antioxidant Properties of Blackberry, Blueberry, and Raspberry Nectars

2016 ◽  
Vol 5 (5) ◽  
pp. 11
Author(s):  
Jose Fernando Haro-Maza ◽  
Jose Angel Guerrero-Beltran
Keyword(s):  
Antioxidant Capacity ◽  
Treatment Time ◽  
Antioxidant Properties ◽  
Physicochemical Characteristics ◽  
Light Treatment ◽  
Point Of View ◽  
Soluble Solids ◽  
Total Phenolic ◽  
Constant Flow Rate ◽  
Uv C

The effect of UV-C light on foodborne microorganisms (mesophilic aerobic bacteria (MAB), molds, and yeasts), physicochemical characteristics (color, total soluble solids, pH, and acidity), and antioxidant properties (ascorbic acid, antioxidant capacity (AC), total monomeric anthocyanins (TMA), and total phenolic compounds (TPC)) in blackberry, blueberry, and raspberry nectars was evaluated. Nectars were UV-C light treated at five times (5, 10, 15, 20, and 25 minutes) at constant flow rate (16.48 mL/s). The best UV-C light treatment for the three nectars, from the microbiological point of view, was 25 min. A statistical difference (p < 0.05) in TPC, within treatment times, was observed in nectars; their content was reduced as the treatment time increased, except for the blackberry nectar. The same effect was observed for the antioxidant capacity. The TMA content increased with the UV-C light treatment.

Electroless Coating Process of Carbon Nano Fibers by Copper Metal

2007 ◽  
Vol 534-536 ◽  
pp. 1445-1448 ◽  
Author(s):  
Jean François Silvain ◽  
P. Richard ◽  
Joël Douin ◽  
M. Lahaye ◽  
Jean Marc Heintz
Keyword(s):  
Electroless Deposition ◽  
Treatment Time ◽  
Point Of View ◽  
Coating Process ◽  
Copper Metal ◽  
Step Method ◽  
Microscopy Imaging ◽  
Electroless Coating ◽  
Oxide Concentration ◽  
Nano Fiber

A study of the different stages of the electroless deposition of copper on carbon nano fibers activated firstly by a chemical treatment of the carbon nano fiber and secondly by a two-step method has been performed from both a chemical and a morphological point of view. The combination of XPS measurements and scanning electron microscopy imaging has allowed optimizing the 2 different stage conditions. On a first hand, the different oxide concentration and treatment time of the carbon nano fibers and on a second hand the different conditions of the sensibilisation (Sn bath), activation (Pd bath) and coating (Cu bath) have ben studied. The control of the homogeneity and thickness of copper thin films on carbon nano fiber can be obtained and further more sintered in order to obtain fully dense materials.

Evaluation of thermal steam-explosion key operation factors to optimize biogas production from biological sludge

2015 ◽  
Vol 72 (6) ◽  
pp. 937-945 ◽  
Author(s):  
S. I. Pérez-Elvira ◽  
I. Sapkaite ◽  
F. Fdz-Polanco
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Steam Explosion ◽  
Treatment Time ◽  
Biogas Production ◽  
Negative Influence ◽  
Point Of View ◽  
Lag Phase ◽  
Biological Sludge ◽  
The One

Thermal steam-explosion is the most extended hydrolysis pretreatment to enhance anaerobic digestion of sludge. Thermal hydrolysis key parameters are temperature (T) and time (t), and the generally accepted values reported from full-scale information are: 150–230 °C and 20–60 min. This study assesses the influence of different temperature–time–flash combinations (110–180 °C, 5–60 min, 1–3 re-flashing) on the anaerobic degradation of secondary sludge through biochemical methane potential (BMP) tests. All the conditions tested presented higher methane production compared to the untreated sludge, and both solubilization (after the hydrolysis) and degradation (by anaerobic digestion) increased linearly when increasing the severity (T–t) of the pretreatment, reaching 40% solubilization and degradation of the particulate matter at 180° C–60 min. However, for the 180 °C temperature, the treatment time impacted negatively on the lag phase. No influence of re-flashing the pretreated matter was observed. In conclusion, thermal steam-explosion at short operation times (5 min) and moderate temperatures (145 °C) seems to be very attractive from a degradation point of view thus presenting a methane production enhancement similar to the one obtained at 180°C and without negative influence of the lag phase.

Sign in / Sign up

Export Citation Format

Share Document