Water Filter Articles on Environmental XPRT

Water Treatment System Types and Their Benefits

Water is one of the most important utilities in the world. It’s used for bathing, cooking, washing clothes, cleaning dishes, and drinking. If you get your water from the city, you trust your tap water to be clean and healthy. It goes through a treatment plant before it reaches you, so it’s perfectly purified when it reaches you—right? Unfortunately, this isn’t always the ...

Jul. 25, 2017

By Adedge Water Technologies, LLC

Water filters fact sheet

Why do people use water filters? Water filters are used to upgrade the quality, taste and appearance of water in the home. Water filters can also be used to eliminate concerns about contaminants and other potential health hazards in tap water. What do water filters do? Water filters eliminate a number of common water problems in the home, ...

Oct. 6, 2015

By Kinetico - an Axel Johnson Company

Water treatment plant filter improvements

Client: City of Junction City, Kan. Completion Date: March 2003 Services Provided Filter rehabilitation Air scour system design Construction phase services Project Summary Burns & McDonnell provided planning, design, bidding and construction services for the City of ...

Sep. 21, 2009

By Burns & McDonnell

Filter backwash water treatment options

Filtration acts as the final step in the removal of suspended matter and protozoa. The accumulated residue is removed during the backwash process and any subsequent recycling of filter backwash water could potentially re-introduce these contaminants into the main treatment process. By separating the filter backwash water from the main treatment process, factors that could interfere with the ...

May 28, 2014

By IWA Publishing

Filter backwashing

Backwashng a drinking water system filter means reversing and increasing the water's flow to flush out accumulated debris and particles. Backwashing is not only vital to the life of a filter, it is fundamental to the quality of water coming out of the filter. Sooner or later, all filters need to be backwashed or ...

May 26, 2009

By Entech Design, Inc.

Filter aids

Filter aids are used to assist filtration of colloids, extra fine particles, gel like, and highly compactible materials, which are difficult to be filtered due to low filtrate rate, unacceptable filtrate clarity, high cake moisture content, or serious filter medium clogging. They can be used as “precoat” on the surface of filter media or in conjunction with feeding suspension as ...

Jul. 29, 2011

By American Filtration & Separations Society

Combination filters

Simply defined, a combination filter is one that does at least one other processing job at the same time as filtering a suspension. The classic example, of course, is the packed bed of activated charcoal, which acts as a remover of chemical impurities from the suspension, as well as removing dust particles - although this is actually not a very good example, because it is primarily an adsorber, ...

Jul. 28, 2011

By American Filtration & Separations Society

Soil Filters

Soil filters (in german: Retentionsbodenfilter) are facilities for the removal of nutrients and/or pollutants; typically on the level of an industrial site, a quarter or a drainage system (sub-)catchment. Usually they are located at the discharge points to surface waterbodies to ensure water quality standards. Soil filters consist of two parts: The first part is a retention pond or basin for ...

Sep. 12, 2011

By IWA Publishing

Filter refurbishment program for Southern Water in Eastrey

Peak flow to treatment: PE of site: 2090 (550 m3/day) Formula A site Units supplied: 2 off steel 500 pe units (Rental units) Purpose of rental units: To allow for the refurbishment of trickling filter beds, initially the SAF units were used for both carbonaceous treatment and ammonia removal. Once the trickling filter beds were ...

Mar. 1, 2009

By WPL Ltd

Filter refurbishment program for Thames water in Berkhamstead

Purpose of rental unit: To provide additional nitrification to works whilst trickling filters were refurbished Consent standard required: 3mg/l NH4 Total flow to the unit: 21l/s @ 1 hours retention (50 minutes is minimum retention to achieve nitrification) Unit supplied: 1 x Steel 1000pe wastewater treatment unit ...

Mar. 1, 2009

By WPL Ltd

Assessment of a membrane drinking water filter in an emergency setting

The performance and acceptability of the NeroxTM membrane drinking water filter were evaluated among an internally displaced population in Pakistan. The membrane filter and a control ceramic candle filter were distributed to over 3,000 households. Following a 6-month period, 230 households were visited and filter performance and use were assessed. Only 6% of the visited households still ...

Jun. 8, 2015

By IWA Publishing

The Next-Generation Water Filter for the Oil and Gas Industry

Many segments of the oil and gas production industry need improvements in water filtration over traditional methods. This is true because of the trend toward oil and gas production in tighter, less permeable reservoirs and the greater use of enhanced oil recovery (EOR) techniques, many of which involve injecting water into the oil reservoir. To protect the integrity of such reservoirs, the amount ...

Oct. 1, 2013

By Eco-Tec Inc.

An antimicrobial polycationic sand filter for water disinfection

A new sand filtration water disinfection technology is developed which relies on the antimicrobial properties of hydrophobic polycations (N-hexylated polyethylenimine) covalently attached to the sand's surface. The efficacy of the filter disinfection process was evaluated both with water spiked with E. coli and with real aqueous effluent from a wastewater treatment plant. For the ...

Jan. 1, 2011

By IWA Publishing

Alternative filter media for potable water treatment

Need for Research Roughing filters at London works: Low backwash rates for filters at older works Inability to keep sand clean (rising normalised starting head loss) Vulnerability to algal laden water Loss of production at critical times during the year Objective: identify mono-medium & dual media alternatives to BSS 14/25 ...

Jan. 5, 2016

By Filtralite Saint-Gobain Byggevarer As

Innovative Multi-Media Filter – Continuous Backwash Filter

The disadvantages of conventional MMF based pretreatment Conventional pretreatment is based on multimedia filters (MMF) implemented in large scale desalination plants. Although this filtration method is well proven and provides reliable filtration efficiency, it conceals an inherent drawback, the disadvantages of which relate mainly to the backwashing mechanism. The ...

Feb. 1, 2014

By IDE Technologies

Serological responses to Cryptosporidium antigens among women using riverbank-filtered water, conventionally filtered surface water and groundwater in Hungary

ABSTRACTWe compared serological responses to Cryptosporidium parvum antigens using surplus sera from females undergoing routine screening for pregnancy from three counties in Hungary where bank-filtered surface water, conventionally filtered and disinfected surface water, and groundwater from either a karst or confined aquifer are commonly used for drinking water. The primary purpose was to ...

Mar. 1, 2005

By IWA Publishing

A farewell to sand filters

By replacing the filter sand with Filtralite, Bedrichov Water Treatment Plant reduced energy cost by 75 %, doubled the production capacity of each filter and today delivers the best drinking water ...

Jan. 5, 2016

By Filtralite Saint-Gobain Byggevarer As

A farewell to sand filters

By replacing the filter sand with Filtralite, Bedrichov Water Treatment Plant reduced energy cost by 75 %, doubled the production capacity of each filter and today delivers the best drinking water ever A new filtering medium is born After six months of testing the new filtering medium Filtralite in full operation at Bedrichov Water, regional manager Ladislav Rainis (right) and local ...

Sep. 1, 2012

By Filtralite Saint-Gobain Byggevarer As

Filter backwashing: When and how

Backwashing filters is a necessary and important part of the filtration process. Many operating problems associated with the filtration process can be traced to delayed or inadequate backwashing. Producing a high-quality and low turbidity filtered water depends on having clean media free of cracks and mudballs. The Interim Enhanced Surface Water Treatment Rule, promulgated on Dec.16, 1998, lowers ...

May 26, 2009

By Entech Design, Inc.

High performance turbidity filter

Turbidity in water is caused by suspended and colloidal matter such as clay, silt, finely divided natural organic matter (NOM), inorganic matter and plankton plus other microscopic organisms, according to Standard Methods 2130. Waterborne pathogens have caused significant disease outbreaks in the United States and continue to pose a significant risk. The most frequently reported waterborne ...

Feb. 1, 2005

By Argonide Corporation

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