pH/redox Articles
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pH and redox buffering systems of landfill leachate contaminated aquifer materials
Introduction of landfill leachate into an aerobic aquifer leads to a variety of redox and pH buffering reactions between dissolved chemical species and aquifer sediments, which play profound effects on the behaviours of contaminants beneath and down gradient from the landfill. The specific objective of this study was to determine the spatial and temporal variations of pH and redox buffering ...
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Mathematical modelling of sediment chemicophysical parameters in a coastal lagoon to estimate high density seagrass meadow (Ruppia cirrhosa) distribution
In spring 2003, the pH, redox potential (Eh), grain-size (G), Total Nitrogen (TN), Total Phosphorus (TP) and Total Organic Carbon (TOC) were measured in superficial sediment samples from 83 sampling stations equally and randomly distributed inside the Orbetello lagoon. Localisation of the seagrass meadows (Ruppia cirrhosa) and the estimation of biomasses were carried out at the same time. A ...
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Electrokinetic delivery of permanganate into low-permeability soils
A bench-scale study was conducted to investigate the feasibility of using electrokinetics as a method of delivering an oxidant into kaolin, a low-permeability soil. Potassium permanganate (KMnO4) was chosen as the oxidant, and in separate tests, KMnO4 was introduced at the anode, the cathode and both electrodes to investigate (1) the extent of oxidant transport via electroosmosis and ...
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Investigations on different positions of electrodes and their effects on the distribution of Cr at the water sediment interface
Abstract: In most mining areas, significant concentrations of metals such as Pb, Cu, Cr, Zn, Cd, Fe, Mn, Co, Ni, Hg, Ar, halogenated organic compounds and radionuclides are found. Of those, Cr is one of the well-known heavy metals that forms toxic species. It is necessary to study the mobilisation and accumulation of Cr at the sediment water interface in an electric field at varying different ...
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S2N Smart Buoy on the backwater of the Danube!
Within the confines of a jointly created project with BOKU Austria (Universität für Bodenkultur Wien), we have placed two S2N Smart Buoys in the Lobau quarter of Vienna, in 2 different parts of the backwater of the river Danube. The buoys will continuously measure water temperature, pH, dissolved oxygen, redox potential and conductivity data, which then will be transmitted to our ...
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Dissolved Oxygen – the discussion moves on
Do Dissolved Oxygen Sensors need Cleaning? The re-emergence of Optical Dissolved Oxygen Sensors around 6-7 years ago generated a lively and interesting discussion which revolved around the relative merits of Optical and Galvanic Dissolved Oxygen sensors. We understand that opinions will differ, so in order to accommodate our customers preferences we are pleased to offer our OxyTechw² sensor ...
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Subsurface movement of zinc from contaminated dredge spoils at a periodically flooded site
In 1982, sediments contaminated with zinc, cadmium, and copper were dredged from Lake DePue in Illinois and deposited in a diked sediment disposal area (DSDA) that is flooded annually for at least three months. Data from soil and groundwater samples collected at multiple depths within and adjacent to the DSDA indicate vertical movement of the metals in the subsurface, although groundwater outside ...
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Sodium chloride as a tracer for hydrodynamic characterization of a shallow maturation pond
The results of tests with a sodium chloride tracer in a shallow maturation pond in Brazil are presented. The pond – a full-scale effluent treatment unit for around 250 p.e – was 0.80 m deep with a length/width ratio of 4.3:1, and had accumulated sludge for 12 years to about 40% of the total volume. The pond is subject to daily cycles of thermal stratification/destratification, as shown by ...
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Trace metal dynamics in floodplain soils of the River Elbe: A review
This paper reviews trace metal dynamics in floodplain soils using the Elbe floodplains in Germany as an example of extraordinary importance because of the pollution level of its sediments and soils. Trace metal dynamics are determined by processes of retention and release, which are influenced by a number of soil properties including pH value, redox potential, organic matter, type and amount of ...
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Sources and leaching of manganese and iron in the Saigon River Basin, Vietnam
High concentrations of manganese and iron in the Saigon River are major problems for the water supply in Ho Chi Minh City (HCMC), Viet Nam. To identify their sources and leaching processes, we surveyed water quality along the Saigon River and ran batch leaching tests using soil and sediment samples. Two important leaching processes were identified: acidic leaching from acid sulfate soil (ASS) in ...
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What is TDS?
Answer: Total Dissolved Solids (TDS) is a measure of the combined content of all the inorganic and organic substances such as mobile charged ions, minerals, salts or dissolved metals in a volume of liquid. Normally TDS is used in water testing, where TDS is defined as anything present that is not pure water (H2O) molecule or suspended solids. Finding out the exact amount of TDS in water has many ...
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Biofiltration field study for cold Fe(II)- and Mn(II)-rich groundwater: accelerated Mn(II) removal kinetics and cold-adapted Mn(II)-oxidizing microbial populations
Removal of Mn(II) from Fe(II)- and Mn(II)-rich groundwater in cold regions is challenging, due to slow Mn(II) removal kinetics below 15 °C. This study demonstrated onset, acclimation, and acceleration of Mn(II) removal in a two-stage pilot-scale biofilter (Fe and Mn filters) at varying low on-site temperatures (8–14.8 °C). Mn(II) removal commenced at 8 °C in the Mn filter after Fe(II) ...
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Application of water quality detector
Background: Water quality detector is a device used to measure the quality of water. It usually consists of multiple sensors and measuring systems to detect water pH, REDOX potential (ORP), electrical conductivity (EC), dissolved oxygen (DO), temperature, turbidity, hardness, ammonia nitrogen, nitrite nitrogen (NO2-N), nitrate nitrogen (NO3-N), total phosphorus (TP), total nitrogen (TN), ...
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Common water quality sensors
The role of water quality sensor:Water quality sensor is a device used to measure water quality, usually consisting of multiple sensors and measuring systems. The function of water quality sensor is to detect various substances in water, and convert them into electrical signals, and then through the measurement system for processing and analysis, get the indicators of water quality. Water quality ...
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Active slag filters—simple and sustainable phosphorus removal from wastewater using steel industry byproduct
Active filtration, where effluent is passed through a reactive substrate such as steel slag, offers a simple and cost-effective option for removing phosphorus (P) from effluent. This work summarises a series of studies that focused on the world's only full-scale active slag filter operated through to exhaustion. The filter achieved 75% P-removal during its first 5 years, reaching a retention ...
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Cyanobacteria successfully monitored and controlled by using ultrasound
Cyanobacteria- also known as blue-green algae- cause problems when blooming in lakes, ponds and reservoirs. Mainly due to the production of toxins, cyanobacteria cause fish kill and the death of other aquatic animals. They also affect human beings, causing paralysis and skin irritation, and they are even thought to be related to the occurrence of liver cancer. In drinking water reservoirs, the ...
By LG Sonic
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Can harmful algal blooms be predicted?
Summer 2015, as the eighth month of the year approaches (August), we are starting to hear and read in the news about sudden algal blooms occurring in freshwater lakes and marine environments. Many popular beach resorts have put up warning signs proclaiming the water is unsafe for recreational purposes. This is an understandable precautionary measure since phytoplankton abundance or more ...
By LG Sonic
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Real-Time Bathing Water Quality Monitoring for Total Coliforms Case Study
RS Hydro were contacted to specify and commission a Proteus real-time water quality monitoring system to monitor BOD, COD & Total Coliforms at a marine leisure centre. The client wanted the ability to have real-time or near real-time data from a system so that they could be alerted immediately if it was not safe for people to swim in. The Proteus was provided with BOD, COD, Total Coliforms, ...
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Lysimeter comparison of the role of waste characteristics in the formation of mineral deposits in leachate drainage systems
A common operational problem in leachate collection systems is clogging due to the formation of deposits within pore spaces and collection pipes. The role of co-disposal of municipal solid waste (MSW) and combustion residues from waste-to-energy (WTE) facilities in clogging is evaluated in this paper. Five parallel lysimeters were operated in monofill or co-disposal mode using MSW, WTE combustion ...
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LG Sonic to automatically predict algal blooms
LG Sonic will make use of Artificial Intelligence (AI) to further develop the software algorithm which will make it possible to predict algal blooms based on water quality data automatically. Furthermore, it will provide detailed information about the intensity and the impact of the algal bloom on the ecosystem of the water body. The updated algorithm will be implemented in LG Sonic’s ...
By LG Sonic
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