oxidation reduction potential Articles
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The Basics of Oxidation-Reduction Potential (ORP)
Introduction Oxidation-reduction potential, or ORP for short, is the measure of how likely a solution is to give or receive electrons given the right circumstances. Some common applications involve pollution control and as a measurement of biological activity such as fermentation. ORP can be difficult to interpret, however, for reasons that will be discussed later in this article. To start, ...
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Surface characterisations and photocatalytic property of MWO 4 (M = Fe 2+ , Co 2+ , Ni 2+ ) nanoparticles
MWO 4 (M = Fe 2+ , Co 2+ , Ni 2+ ) nanocrystalinee synthesised by a salt aqueous solution reaction show similar nanoparticle size, good ultraviolet-visible light absorption and narrow bandgap energy. The oxidation-reduction potential of methyl orange aqueous solution with initial pH = 5−7 is positively varied as presence of the nanoparticles in ultraviolet-visible light irradiation, ...
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The effect of electrolysis and oxidation–reduction potential on microbial survival, growth, and disinfection
A study of the effects of changes in oxidation–reduction potential (ORP) in synthetic waters on bacterial growth is presented. In this study, ORP is altered by electrolysis, as opposed to the traditional use of oxidising chemicals. As synthetic halide-free water was used no oxidised halide species such as chlorine or bromine were formed. Bacterial survival was directly correlated with changes in ...
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Monitoring and control of a partially packed biological aerated filter (BAF) reactor for improving nitrogen removal efficiency
This paper examines on-off systems and automatic monitoring and control of a biological aerated filter to identify the end point of nitrification and denitrification processes, and chemical oxygen demand (COD), ammonia-nitrogen removal (NH3-N) and aeration savings. Oxidation-reduction potential (ORP), pH and dissolved oxygen (DO) were measured on-line and chemical parameters were measured in the ...
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The Control of pH and Oxidation Reduction Potential (ORP) in Cooling Tower Applications
The importance of keeping cooling tower water in proper chemical balance is becoming clearer. Cooling tower treatment control systems can limit scale formation to improve efficiency, limit corrosion to increase the service life of the cooling water system, and maintain a residual halogen level to reduce liability associated with biological growth, particularly Legionellae. The use of automatic ...
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Development of polymer lab-on-a-chip (LOC) for oxidation-reduction potential (ORP) measurement
Reverse osmosis (RO) desalination has been recognized as a promising method to solve the water shortage problem. Nevertheless, since it is energy intensive and has many problems associated with biofouling/fouling of RO membranes in RO plants, its commercial acceptance is still slow. Especially, as high levels of oxidizing agents negatively affect RO membrane efficiency and life span. So, there is ...
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Selenium Removal
The oil refinery was in search of a feasible solution for the removal of selenium. Discharge permit changes by the EPA require a reduction of 50% from current levels. Integrated Engineers, Inc. was given an opportunity to perform a feasibility test to determine a treatment process as well as estimated operational costs. The best process was to adjust the pH from 7.0 to 10.0 using caustic, ...
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What is Kangen Water?
Kangen Water is a very special water that is produced by water ionizers manufactured exclusively by Enagic, Inc., a Japanese company founded in 1974. The word Kangen means "Return to Origin" in Japanese. Kangen Water must have an alkaline pH, it must be micro-clustered, and must have a high negative ORP or oxidation-reduction potential. Don't be fooled by look-a-likes. Enagic brand ionizers have ...
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Optimization of VFAs and ethanol production with waste sludge used as the denitrification carbon source
An acidification metabolite such as volatile fatty acids (VFAs) and ethanol could be used as denitrification carbon sources for solving the difficult problem of carbon source shortages and low nitrogen removal efficiency. A proper control of environmental factors could be essential for obtaining the optimal contents of VFAs and ethanol. In this study, suspended solids (SS), oxidation ...
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Granularity determination of activated sludge through on-line profiles by means of case-based reasoning
Aerobic granulation from floccular sludge is difficult to detect in first stages with the naked eye. This work proposes a combination of multi-way principal components and case-based reasoning to predict the granulation state of a sequencing batch reactor, based solely on the on-line registered profiles of common sensors (i.e. pH, dissolved oxygen and oxidation-reduction potential). The ...
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Distribution characteristics of ammonia-oxidizing bacteria in the Typha latifolia constructed wetlands using fluorescent in situ hybridization (FISH)
A molecular biology method, fluorescent in situ hybridization (FISH), in which the pre-treatment was improved in allusion to the media of the constructed wetlands (CW), e.g. the soil and the grit, was used to investigate the vertical distribution characteristics of ammonia-oxidizing bacteria (AOB) quantity and the relation with oxidation-reduction potential (ORP) in the Typha latifolia ...
By IOS Press
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The ORP and pH profiles during simultaneous nitrification and denitrification of low carbon municipal wastewater
The ORP and pH profiles and the stability of Simultaneous Nitrification and Denitrification (SND) for low carbon municipal wastewater treatment were investigated under the different aeration modes in Sequencing Batch Reactor (SBR). The results showed that the 92% removal efficiency for TN, the smallest average level of ORP and both of the variation of ORP and pH values are achieved in ...
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Characterization of sludge properties for sewage treatment in a practical-scale down-flow hanging sponge reactor: oxygen consumption and removal of organic matter, ammonium, and sulfur
The characteristics of sludge retained in a down-flow hanging sponge reactor were investigated to provide a better understanding of the sewage treatment process in the reactor. The organic removal and sulfur oxidation conditions were found to differ between the first layer and the following three layers. It was found that 63% and 59% of the organic matter was removed in the first layer, even ...
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Advanced nitrogen removal using pilot-scale SBR with intelligent control system built on three layer network
Since eutrophication has become increasingly severe in China, nitrogen and phosphorous have been the concern of wastewater treatment, especially nitrogen removal. The stabilization of the intelligent control system and nitrogen removal efficiency were investigated in a pilot-scale aerobic-anoxic sequencing batch reactor (SBR) with a treatment capacity of 60 m3/d. Characteristic points on the ...
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The economic pre-treatment of coal mine drainage water with caustic and ozone
Coal mine drainage waters are low in pH with varying amounts of iron and manganese and are generally brackish. The Austar Coal Mine in NSW, Australia, sought alternatives to their current lime dosing as the pre-treatment before the downstream reverse osmosis plant. Undesirable operating aspects of the current system include manganese and gypsum scaling/fouling, the need for anti-scalants and ...
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Evaluation of polishing of the effluent from UASB reactor by diffusers
Effluents from bench scale 56 L upflow anaerobic sludge blanket (UASB) reactor and four UASB based sewage treatment plants (STPs) of capacities ranging from 27 ML/d to 70 ML/d were aerated in batch as well as in continuous mode of operation. The process was monitored by measuring temporal trend in Oxidation Reduction Potential (ORP), dissolved oxygen (DO), chemical oxygen demand (COD) and ...
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Improving the sensitivity of the activated sludge respiration inhibition test and verifying the results using an oxidation-reduction potential electrode
The inhibition of activated sludge respiration is one of the most important parameters for monitoring wastewater toxicity. The main objective of this study was to improve respiration inhibition testing in order to protect the biological degradation within the aerobic process in a wastewater treatment plant more efficiently. In order to influence the sensitivity of the testing bacteria, two ...
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Dynamic control of nutrient-removal from industrial wastewater in a sequencing batch reactor, using common and low-cost online sensors
On-line control of the biological treatment process is an innovative tool to cope with variable concentrations of chemical oxygen demand and nutrients in industrial wastewater. In the present study we implemented a simple dynamic control strategy for nutrient-removal in a sequencing batch reactor (SBR) treating variable tank truck cleaning wastewater. The control system was based on derived ...
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What is ORP and How to Measure?
In this comprehensive guide, we explore the concept of ORP (Oxidation-Reduction Potential) and how to measure it. Learn the importance of ORP in various industries, its impact on water quality, and the methods used to determine ORP levels. Dive into the world of ORP and understand its significance in today's environment. Introduction What is ORP, and why is it important? If you've ever wondered ...
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What is Genclean Advanced Oxidation Disinfection?
What is Advanced Oxidation Disinfection? In an overview, advanced oxidation disinfection is a specific treatment process designed to oxidize, disinfect, and remove organic and certain inorganic contaminants from water and wastewater through the generation of hydroxyl radical (OH) and other specific compounds. What is Oxidation Reduction Potential (ORP)? ORP stands for oxidation reduction ...
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