air stripping Articles
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Application of ultrasound and air stripping for the removal of aromatic hydrocarbons from spent sulfidic caustic for use in autotrophic denitrification as an electron donor
Spent sulfidic caustic (SSC) produced from petroleum industry can be reused to denitrify nitrate-nitrogen via a biological nitrogen removal process as an electron donor for sulfur-based autotrophic denitrification, because it has a large amount of dissolved sulfur. However, SSC has to be refined because it also contains some aromatic hydrocarbons, typically benzene, toluene, ethylbenzene, ...
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Application of air stripping to powdered activated carbon adsorption of geosmin and 2-methylisoborneol
Removal of odor-causing compounds (OCCs) including geosmin and 2-methylisoborneol (2-MIB), well known to cause the musty and earthy odor in drinking water, was investigated using powdered activated carbon (PAC) adsorption and air stripping processes. Removal by air stripping was mainly affected by aeration flow rates with volumetric mass-transfer rates of 0.002–0.005 min−1. Aeration also proved ...
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Modeling of air stripping from volatile organic compounds in biological treatment processes
The removal of volatile organic compounds from biological treatment processes occurs through several mechanisms. These include biodegradation, adsorption onto solids, and air stripping or volatilization to the atmosphere. Volatilization results in fugitive emissions to the atmosphere, which is largely uncontrolled. Recent regulations have called for increased evaluation and control of inadvertent ...
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Simultaneous regeneration of exhausted zeolite and nitrogen recovery using an air stripping method at alkaline pH
Ammonium nitrogen recovery using natural zeolite from the permeates of anaerobic membrane bioreactors was investigated with batch and continuous experiments. Regeneration of exhausted zeolite was compared between mechanical shaking and air stripping, and experimental results showed the superiority of air stripping over the shaking. Liquid circulation and air flow rates were optimized in a ...
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Identification of α-β unsaturated aldehydes as sources of toxicity to activated sludge biomass in polyester manufacturing wastewater
Wastewater generated in industrial production processes are often contaminated by hazardous chemicals. Characterization by means of toxicity-directed analysis is useful for identifying which fractions of a waste stream possess the most toxicity. We applied this approach to evaluate toxic components of a polyester manufacturing wastewater. Using the reduction in oxygen uptake rate of activated ...
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The ion-exchanger–loop-stripping process: ammonium recovery from sludge liquor using NaCl-treated clinoptilolite and simultaneous air stripping
The technical feasibility of an ammonium recovery process (‘ion-exchanger–loop-stripping’) for sludge liquor from municipal wastewater treatment plants is examined. The proposed process combines ion-exchange on natural zeolites with simultaneous air stripping of ammonia to produce an industrial NOx-removal agent. Column experiments with continuously recycled NH4Cl-solutions and a real sludge ...
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Ammonia nitrogen removal and recovery from acetylene purification wastewater by air stripping
Ammonia nitrogen (NH4-N) contaminated wastewater has posed a great threat to the safety of water resources. In this study, air stripping was employed to remove and recover NH4-N from acetylene purification wastewater (APW) in a polyvinylchloride manufacturing plant. Investigated parameters were initial APW pH, air flow rate, APW temperature and stripping time. The NH4-N removal by air ...
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Removal and recovery of N, P and K from urine via ammonia stripping and precipitations of struvite and struvite-K
This study investigated the recovery of N, P and K from source-separated urine in laboratory-scale combined processes of air stripping and precipitation. Two operation scenarios were carried out to recover N/P (named partial scenario) and N/P/K (named complete scenario). Most of the nutrients were recovered (>70%) by optimising the operation parameters including the increase of air flow ...
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Enhancement of organic and nitrogen removal in up-flow floating filter media reactor for piggery wastewater treatment
Integrated up-flow floating media system utilised sponge cube floating bed for microbial attachment and suspended solid clarification. The first reactor was operated under anaerobic condition where high organic removal of more than 85% was reached. It was followed by anoxic/aerobic floating media reactors or chemical coagulation/air stripping units. When biological post treatment was employed, ...
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Radon Air Stripping of Well Water
Radon is Frequently Found in Ground Water Radon, symbol Rn, atomic number 86, is a colorless, odorless gas at ambient conditions. It is the heaviest element of the Noble Gas family. As such it is extremely stable and unreactive chemically. But it also is highly radioactive. Its half-life is only 3.8 days. Both Thorium, symbol Th, atomic number 90 and Uranium, symbol U, atomic number 92, have no ...
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CO2 degasifiers packed with LANPAC cut the cost of drinking water pH adjustment to comply with EPA Lead and Copper Rule.
After the phase-out of leaded gasoline and the ban on lead-based pigments in house paint, concerned has focused on the risk of lead exposure from drinking water due to corrosion of old plumbing containing lead pipe or solder. To reduce this public health risk, the EPA’s Lead and Copper rule now requires many drinking water systems to deliver water at higher pH so that it will be less ...
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KS 1000 compact stripper case study - IEG Technologie GmbH
VOC-contaminated groundwater is treated in a 2-stage low-profile compact vacuum stripper (CVS). A negative pressure blower applies a vacuum to the treatment chamber. In this chamber a 2-stage stripping reactor is located and the stripping air is directed to the upper tray. The groundwater loops around on the upper tray along designate barriers, while the stripping air is being pulled through the ...
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RainWise Telemetry MK-lll-LR Air Strip Project - Case Study
This project required weather data to be monitored at a remote air strip in a valley, which was then sent via the mobile phone network back to Sydney so the owner could monitor weather conditions before flying out to this remote location. The only Next G phone signal was located almost 2km away through dense bush on the side of a hill. The solution required a three part approach; A high ...
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CO2 degasification air stripping tower design - Case study
Background - Water Chemistry Controls the Design A common method to adjust pH of water - typically well water intended for potable use - is to pass the water through a packed tower. Such towers intended to degas the water was also commonly called 'air strippers'. This is because the water is passed down over a bed of 'packing1 as air is blown into the bottom of the tower to pass up and out of the ...
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Method for remediation of aquifers
The US Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of contract F41624-99 C-8033 awarded by the United States Air Force Material Command. BACKGROUND OF THE INVENTION 1. Field of the InventionThis invention relates to the remediation of contaminated ...
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Identification and Confirmation of Ammonia Toxicity in Contaminated Sediments using a Modified Toxicity Identification Evaluation Approach
Abstract: Toxicity identification of sediment pore waters from four sites in the upper Scheldt (Belgium) was assessed using a simplified and discriminative toxicity identification evaluation procedure. The samples from all locations exhibited acute toxicity toward the freshwater crustaceanThamnocephalus platyurus. Toxicity was removed or considerably reduced by the cation exchange resins and air ...
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The Toxicity Identification of Inorganic Toxicants in Real World Samples
Abstract :The toxicity of a sediment pore water and an effluent was characterized using Toxicity Identification Evaluation (TIE) procedures. Both samples exhibited acute toxicity to the freshwater crustaceanThamnocephalus platyurus. The TIE approach was conducted using an enlarged battery of fractionation tests. Toxicity of the pore water sample was removed or reduced significantly by the cation ...
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E-Z Trays selected for Large scale project - Case Study
A former industrial plant and top Superfund site in Sydney, Australia, had been in operation since the 1930s and contained chlorinated solvent contamination. Because of the size and scope of this project packed towers traditionally would have been the air stripping method of choice, but the client was concerned about the ability of workers having easy access to maintain and clean the units. They ...
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Chlorinated Solven - ART In-well Air Stripping Technology, MN - Case Study
Accelerated Remediation Technologies, LLC (ART) was secured by a major uniform services company to provide remediation technology at a PCE site in Minneapolis. Contaminant concentrations had reached asymptotic levels and were significantly higher than defined action levels. ART worked with the client's consultant to install the ART Technology in the most contaminated source area location. Within ...
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Coarse Bubble Diffusers
Coarse bubble diffusers are suitable for almost any type of water and wastewater application. The primary application of coarse bubble diffuser systems today are as indicated below: Aerobic Digestion Applications Coarse bubble diffusers have been the traditional diffusers used in these applications. The standard design rate for this application is 30 scfm per 1000 ft of tank volume. ...
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