water disinfection reactor Articles
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A computational fluid dynamics analysis of placing UV reactors in series
Ultraviolet (UV) light water treatment reactors are commonly used in both wastewater and drinking water disinfection. UV technology can effectively inactivate a large number of pathogens at low UV doses, however adenovirus requires a substantially higher dose than most pathogens of interest. In order to meet adenovirus inactivation requirements, UV reactors are often placed in series and the ...
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Interpreting UV validation results: impact of key design parameters on performance of closed vessel reactors
The Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR) dictates that for a DWTP to receive credit for UV inactivation of chlorine resistant pathogens such as Cryptosporidium and Giardia , validation testing must be performed to demonstrate that the UV reactor equipment delivers the required dose. This paper summarizes an extensive bioassay validation program undertaken at the DVGW ...
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Spectral distribution of uv light during aging of medium pressure UV lamps
As part of a project to validate a UV reactor for disinfection of drinking water, the germicidal output of four medium pressure lamps housed in a continuously operating reactor was followed as a function of time. Spectra were measured monthly and were used in conjunction with radiometer readings to calculate germicidal fluence rates (using DNA absorbance weighting) at the radiometer sensor ...
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Effects of phosphorus on biofilm disinfections in model drinking water distribution systems
Drinking water biofilm development is affected by the available nutrient levels and the presence of disinfectants. Phosphorus is recognized as another important limiting nutrient besides organic carbon. In this study, drinking water biofilms were developed in annular reactors to examine the effects of phosphorus on the biofilm disinfections with free chlorine and monochloramine. Phosphorus ...
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Aging evaluation of medium-pressure mercury lamps under typical operating conditions for drinking water disinfection applications
Little is known regarding how medium pressure (MP) ultraviolet (UV) lamps age under typical operating conditions, yet a number of assumptions regarding lamp aging are utilized when UV reactors are validated, often as unfounded approximations. This study was designed to evaluate the aging of MP UV lamps utilized with a closed-vessel UV reactor technology for drinking water disinfection ...
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Kinetic model of water disinfection using peracetic acid including synergistic effects
The disinfection efficiencies of a commercial mixture of peracetic acid against Escherichia coli were studied in laboratory scale experiments. The joint and separate action of two disinfectant agents, hydrogen peroxide and peracetic acid, were evaluated in order to observe synergistic effects. A kinetic model for each component of the mixture and for the commercial mixture was proposed. ...
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Effect of ozone on secondary effluent treatment for reuse in agriculture
The results of secondary effluents ozonation from domestic sewages treatment plants in Havana, Cuba are presented. The ozone effect on some physico-chemical parameters was determined. The ozone gas concentration is the parameter, which exerts the greatest influence on the ozone transferred. The results indicated that ozonation of secondary effluents is a safe disinfection alternative for ...
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Disinfection of roof harvested rainwater for potable purpose using pilot-scale solar photocatalytic fixed bed tubular reactor
The potable use of harvested rainwater is limited, mainly due to contamination with various pathogenic microorganisms. Disinfection of microorganisms by solar photocatalysis is emerging as a promising technique for drinking water treatment. The present study deals with the preparation of Ag-doped TiO2 by the sol gel method, and its immobilization over the inner surface of the Pyrex glass ...
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Methodological considerations when conducting bench scale polychromatic ultraviolet irradiation of water
The use of a bench scale apparatus (often referred to as a ‘collimated beam’) to apply fluences to water samples is common practice in disinfection research and in validating the performance of full-scale UV disinfection reactors. This study investigated the sources of potential experimental variations in the calculation of fluence when conducting polychromatic collimated beam ...
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Disinfection performance testing of high-efficiency ultraviolet water treatment chamber
When introducing a disinfection product which incorporates new technology, it is essential that the methods and testing used to quantify the performance of those systems follow protocols which are technically sound and which are accepted by the scientific and technical community within the industry. These protocols must be applied precisely and rigorously in order to ensure accurate, repeatable ...
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Organic matter degradation in a greywater recycling system using a multistage moving bed biofilm reactor (MBBR)
Greywater is an important non-conventional water resource which can be treated and recycled in buildings. A decentralized greywater recycling system for 223 inhabitants started operating in 2006 in Berlin, Germany. High load greywater undergoes advanced treatment in a multistage moving bed biofilm reactor (MBBR) followed by sand filtration and UV disinfection. The treated water is used safely ...
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How to Choose a UV Treatment System for Water Reuse in Your Facility
Water reuse is, and will continue to be one of the biggest considerations for companies all over the world in the battle against water scarcity. By reusing process water, grey water, and wastewater, buildings and facilities will reduce their demand for raw water from surface and groundwater sources and reducing the associated costs of supplying raw water and treating raw water before use. One of ...
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Advanced engineering for ATEX solutions
The process of disinfecting water with UV light is a proven technology for drinking and process water in many industries, however the high standards required by the offshore industry command these systems to be engineered way beyond the normal specification of many manufacturers. When a leading offshore contractor based in Malaysia required two high specification ATEX systems for operation in ...
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A preliminary Ames fluctuation assay assessment of the genotoxicity of drinking water that has been solar disinfected in polyethylene terephthalate (PET) bottles
Though microbially safe, concerns have been raised about the genotoxic/mutagenic quality of solar-disinfected drinking water, which might be compromised as a result of photodegradation of polyethylene terephthalate (PET) bottles used as SODIS reactors. This study assessed genotoxic risk associated with the possible release of genotoxic compounds into water from PET bottles during SODIS, using the ...
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Biodosimetry of a full-scale uv disinfection system to achieve regulatory approval for wastewater reuse
In order to respond to the stringent disinfection requirements for reclaimed wastewater in the United States, Ozonia North America (ONA) undertook a bioassay validation study of a lowpressure nvery high-output (LPVHO) ultraviolet (UV) disinfection system. The disinfection performance of this process technology was verified via biodosimetry in accordance with the Ultraviolet Disinfection ...
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Effect of water hardness and pipe material on enhanced disinfection with UV light and chlorine
Limited studies have been conducted to evaluate synergistic benefits between disinfectants, although promise has been shown between ultraviolet (UV) light and chlorine-based disinfectants. This research aimed to determine drinking water quality factors that affect potential for enhanced removal of heterotrophic bacteria due to synergy between UV light and free chlorine. An additional goal was ...
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Closed vessel or open channel UV disinfection systems
Ultra violet disinfection is now a standard feature in most waste water disinfection systems. UV has also been adopted by the drinking water community, as a barrier against the chlorine tolerant species such as Cryptosporidium and Giardia. The technology is widely favored due to its non- chemical nature, the fact that no subsequent de-chlorination process is required, and its ability to be ...
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The challenge: Tackling the problem of microorganisms and pesticides - Case Study
As published in this months WET News....Conventional treatment are effective at removing Cryptosporidium, but there are inherent weaknesses in the technologies. atg’s Barry Hopton reveals all. The Challenge “The disinfection of public water supplies is a statutory requirement in England and Wales. Water supplied for domestic or food production purposes must not contain any ...
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Cost Benefits of Process Water Disinfection via UV Light Sterilizer Technology
Water is a substance that has many unique properties unlike any other fluid in the world. It is certainly a vital component of the survival of organic life, but it is also extraordinarily useful in industrial, municipal, and commercial processes. Process water makes up a significant portion of water use in the commercial and industrial sectors and depending on the industry and site, can be used ...
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