odor compound Articles
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Biological origins and annual variations of earthy-musty off-flavours in the Xionghe Reservoir in China
The annual variations in physicochemical parameters, algal abundance and odorous compounds in the Xionghe Reservoir were investigated, in order to identify the possible odorous compounds and their origins. From May 2007 to April 2008, the algal composition, cell number and earthy-musty odorous compounds both in the water and in the flesh of fish at Sites A, B and C were determined monthly. The ...
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New Advances in Wet Scrubbing Improvements in Efficiencies
Of all the air pollution abatement technologies, wet scrubbing systems remain the most versatile and cost efficient. New, patented advances in venturi scrubbing of air particulate, aerosols and gases easily achieves removal efficiencies greater than 99% for particulate and aerosols less than 3 Fm. Sub-micron particles present a special concern because they cause (at the very least) irritation of ...
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Presence, molecular characteristics and geosmin producing ability of
Actinomycetes isolated from South Korean terrestrial and aquatic environmentsThe unpleasant odor of drinking water is one of the major problems in many water utilities in the world. Actinomycetes have long been associated with odorous compounds. Considering the paucity of research on Actinomycetes producing odorous compounds in South Korea, presence of Actinomycetes, their molecular characteristics and ability to produce odorous compounds were investigated in this study. ...
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Occurrence of earthy and musty odor compounds (geosmin, 2-methylisoborneol and 2,4,6-trichloroanisole) in biologically treated wastewater
The concentrations of earthy and musty odor compounds (2-methylisoborneol (2-MIB), geosmin and 2,4,6-trichloroanisole (TCA)) in treated wastewater were measured. Concentrations of 2,4,6-TCA (4.3–37.7 ng/L) and geosmin (3.7–42.2 ng/L) higher than their odor thresholds were detected for effluents from large-scale treatment plants. The effluent from a small-scale wastewater plant ...
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Combined Experiences of Thermal Hydrolysis and Anaerobic Digestion
Historical Perspective of Thermal Hydrolysis First experiments in US 1976 – Haug et al Thermal pre-treatment prior to anaerobic digestion may result in net energy production from the system because of increased biodegradability and reduced digester heating requirements. Recycling of liquid side streams from thermally pre-treated digested sludge should not significantly increase the oxygen ...
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Comparison of Mold Odor Analysis in Water by Purge and Trap (PTC) and Solid-Phase Microextraction (SPME)
Abstract Taste and odor are important to consumers when it comes to drinking water. Two compounds that are responsible for many taste and odor issues are geosmin and 2-methylisoborneol. Both of these compounds are produced by microbes and have very low odor thresholds. Because of this, many drinking water laboratories require detection levels of below 10ppt. Analysis of these compounds is usually ...
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Regulatory dispersion modelling in Finland
We present a review of regulatory atmospheric dispersion models and their application to environmental impact assessment (EIA) in Finland. The following regulatory models are available: the urban dispersion modeling system, models for dispersion of vehicular pollution, the air pollution information system, and the dispersion model for odorous compounds. All of these models are connected to a ...
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Mold Odor Analysis Using a Purge and Trap Multimatrix Autosampler
Abstract Taste and odor are widely associated with drinking water quality. Musty odors, caused by compounds such as geosmin and 2-methylisoborneol (MIB), may lead consumers to believe their water is unsafe. These compounds are byproducts of the growth of blue-green algae and other microbes. Since consumers rely on taste and odor as primary indicators for water safety, water suppliers take steps ...
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For its anniversary, MEDOR® certified ATEX for zone 1 & 2
CSA type approval certification also in progress Since 2009, Chromatotec® proposes a version of its MEDOR® analyzer in Exp cabinet for hazardous areas. This solution dedicated for monitoring and online analysis of odorous compounds in natural gas today received the ATEX certification for zone 1. MEDOR® was already certified for zone 2 since 2014. The ATEX directive consists ...
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Is H2S a suitable process indicator for odour abatement performance of sewer odours?
Odour abatement units are typically designed and maintained on H2S concentrations, but operational failures are reported in terms of overall odour removal, suggesting a wide range of malodorous compounds emitted from sewers that may not be efficiently removed by existing odour abatement processes. Towards providing greater insight into this issue, several activated carbon filters and biofilters ...
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Integrated Odor Control for Solids Handling Operations
Untitled Document Solids handling operations and solids holding facilities are often major sources of odor at wastewater treatment plants. Hydrogen sulfide and other odorous compounds generated during primary settling and solids holding are released during solids processing. For dewatering processes, belt presses in particular are prone to severe odor problems. Belt press ...
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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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Diesel Oxidation Catalyst for Locomotive
Description A tourist touring train in Skagway, Alaska, powered by a 6 cylinder, 900 hp, Alco 251B diesel locomotive. The train carries tourists through a scenic mountain area. Challenge Diesel odor and soot from the diesel locomotive was a nuisance to passengers on the train. DCL was approached for an emission control solution. Solution DCL custom designed an emission ...
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Odorous compounds treatment of winery and distillery effluents during natural evaporation in ponds
ABSTRACTDuring treatment of winery and distillery wastewater by natural evaporation in ponds, formation of malodorous compounds induces harmful olfactory effects. In this work, we studied the origin of malodorous compounds and methods to prevent and treat odours. The formation of volatile fatty acids (VFA) from pure substrates (glycerol, lactic and tartaric acids, ethanol) and complex media ...
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The effect of iron and aluminium for phosphorus removal on anaerobic digestion and organic sulfur generation
The addition of iron or aluminium into activated sludge basins for phosphorus removal is likely to impact both the efficiency of the anaerobic digestion process and the generation of odor-causing compounds following digestion and dewatering. In this study, the impact of iron and aluminium addition on digestion and odor-causing compounds was investigated by using batch digestion of combined ...
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Odorous compounds monitoring, olfactometry, human noses? Which option should you choose?
Odors are very distinct air contaminants as they generate nuisances and can affect nearby residents. The factors playing a role in the determination of odor annoyance are: odor concentration and intensity, frequency, appreciation, duration and location. Several solutions are available as sensory approach (dynamic olfactometry), sensor technologies (portable sensors, electronic noses, etc.). In ...
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Comparison of O3 + GAC, O3 + H2O2 + GAC, and GAC unit operation on natural organic matter and taste and odor causing compounds removal using a pilot plant study
Removal of natural organic matter (NOM) and taste and odor problems in drinking water are a sensitive issue in municipal water treatment plants. This study investigated the effectiveness of ozone (O3) + granular activated carbon (GAC), O3 + hydroperoxide (H2O2) + GAC, and GAC processes using a pilot scale plant to remove NOM and geosmin (50–1,000 ng/L), and 2-methylisoborneol (2-MIB: 50–300 ...
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Development of a novel odor measurement system using gas chromatography
This paper describes a novel odor measurement system for creating arrays of virtual chemical sensors with nonoverlapping responses using ultrahigh-speed gas chromatography with a surface acoustic wave sensor (GC/SAW). This GC/SAW system provides high-resolution twodimensional olfactory images for easy recognition of many complex odors. Separation and quantification of the individual chemicals ...
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Determination of odorous VOCs and the risk of occupational exposure to airborne compounds at the waste water treatment plants
Concentrations of non methane-VOCs and risk levels of employees’ exposure to VOCs were determined at two Finnish waste water treatment plants. The concentration of hydrogen sulphide (H2S) reached the Finnish OEL (occupational exposure limit). The concentrations of styrene, 1,2-dichloroethane, and toluene were found to be elevated at plant A. 328.4 μg/m3 of styrene and 709.8 μg/m3 toluene was ...
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Basys System - Case study
Summary Jefferson County, AL – Management at Jefferson County Environmental Services here reports it has solved a long-running odor problem by tapping a 30,000 cfm-capacity biofilter array into a 14 mgd average, 55 mgd maximum sewage transfer line. The 6- unit BASYS™ array was manufactured by BIOREM Technologies Inc. of Guelph, Ontario. The array handles hydrogen sulfide at average ...
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