fluoride removal system Articles

  • Fluoride reduction system for the reduction of fluorides from wastewaters

    Client: Major semiconductor fab; Santa Clara, CA. Industry: Semiconductor Manufacturing. Installation Date: May 2001. Objective: To reduce total fluorides and neutralize rinse waters and concentrated bath dumps from the fab area. Criteria and Limitations: Influent flow varies from 5,000 gpd to ...


    By Digital Analysis Corp.

  • The Case Against Fluoride - Book Review

    In depth review of the book "The Case Against Fluoride" with some solid evidence that fluoride added to drinking water is potentially dangerous to our health. You’ll find claims that fluoride is a product of the fertilizer industry and considered hazardous waste, it can weaken bones and may cause bone cancer, it affects the thyroid gland and may adversely affect brain development in ...


    By The Water Exchange

  • Project (in process) - thunderbird farms - Arizona arsenic & fluoride removal

    Background In 2008 AdEdge was selected by Atwell Hicks Engineers and Thunderbird Improvement district to provide a 500 gpm treatment system for this Arizona community serving 1,500 population to treat elevated levels of arsenic and fluoride. Non compliant levels are 13 ppb As and 3.20 mg/L F respectively. Raw water quality information is provided in the table below. Several options were ...

  • Removal of ammonium and heavy metals by cost-effective zeolite synthesized from waste quartz sand and calcium fluoride sludge

    This study focuses on the effectiveness of zeolite (10% CF-Z [0.5]) hydrothermally synthesized from waste quartz sand and calcium fluoride (CF) for ammonium ion and heavy metal removal. Zeolite was characterized through powder X-ray diffraction, Fourier-transform infrared spectroscopy, micromeritics N2 adsorption/desorption analysis, and field emission scanning electron microscopy. The effects ...


    By IWA Publishing

  • Pilot-scale fluoride-containing wastewater treatment by the ballasted flocculation process

    A pilot-scale ballasted flocculation system was used to remove fluoride from one type of industrial wastewater. The system included the formation of calcium fluoride (CaF2) using calcium hydroxide followed by coagulation sedimentation. Calcium fluoride was recycled as nuclei for enhancing CaF2 precipitation and as a ballasting agent for improving fluoride removal and flocculation ...


    By IWA Publishing

  • Adsorption of fluoride from aqueous solution by enhanced chitosan/bentonite composite

    In this work, enhanced chitosan/bentonite composite was prepared by treating chitosan/bentonite composite with concentrated hydrochloric acid (HCl). The adsorption of fluoride ions from aqueous solution onto the enhanced chitosan/bentonite composite was investigated. Adsorption studies were performed in a batch system, and the effects of various parameters, such as the pH value of the solution, ...


    By IWA Publishing

  • Chemical Reaction for Disposal of Waste Nitrogen Fluoride From Manufacturing Process of Semiconductors

    New technology to make trifluoro-nitrogen (NF3) gas harmless has been developed and a new concept on the removing toxic gas to be used in the process of manufacturing semiconductors is established. The NF3 gas is a toxic and special type of gas that is used in the process of manufacturing semiconductors and its specific application includes the dry etching of semiconductors, cleaning of CVD ...


  • Boron removal by activated carbon and microfiltration for pre-treatment of seawater desalination

    This study aimed to enhance boron removal through powdered activated carbon adsorption (PAC) and application of a micro-filtration (MF) process as a pretreatment of a seawater reverse osmosis (SWRO) process. Batch and continuous experiments were conducted to investigate the effect of membrane filtration as well as PAC addition on boron removal in reconstituted seawater. In batch test, two kinds ...


    By IWA Publishing

  • Particulate Venturi Scrubber System

    A precious metal refiner required the most advanced particulate scrubber to replace wet ESP for submicron particulate collection. Due to the very high gold prices, economic reasons were the driving force toward maximum removal efficiency. Macrotek was selected to design and install their ultra high efficiency flooded disc MVA scrubber. In addition to the high removal efficiency for submicron ...


    By Macrotek Inc.

  • EM Pure Reverse Osmosis Systems

    The Problem More Dissolved Solids Than Desired In A Water Source Water is never completely free of dissolved solids. It contains varying amounts of impurities which are identified as hardness, alkalinity, minerals, inorganic salts, total dissolved solids or other items. Removal Of Unwanted Solids Suspended solids may be removed by ...


    By Filtronics, Incorporated

  • Case study: KLORIGEN™ system performance

    Des Moines Water Works (DMWW) plays a key role in providing the city of Des Moines and other communities in central Iowa with a safe, clean and healthy water supply. The DMWW operates two water treatment plants in central Iowa, one on Fleur Drive in Des Moines and the second one at Maffitt Reservoir, located southwest of the metropolitan area. Des Moines Water Works is an independently operated ...

  • Different Biological Water Filtration Systems

    Do you know what’s in your water? Most people don’t. It’s recommended that you drink at least a half-gallon of water each day. If it’s not purified or filtered, that water could be causing unseen damage to your body. Arsenic, salmonella, streptococcus, and influenza viruses could all be present in your tap water. There are many different forms of biological filtration that ...

  • Ultrasonic irradiation for ultrafiltration membrane cleaning in MBR systems: operational conditions and consequences

    Ultrasonic irradiation is one of the most promising membrane cleaning techniques for membrane bioreactors (MBRs) because of several advantages such as high flux-recovery capacity and in situ application without interrupting the filtration process. However, significant contradictions may be found and, consequently, this method has not yet been widely developed. In this paper, four MBRs ...


    By IWA Publishing

  • What is an Ion Exchange System and How Does it Work?

    Ion exchange (IX) systems are used across a variety of industries for water softening, purification, and separation purposes. While the chemistry of individual ion exchange reactions vary from one application to the next, IX is a treatment process where dissolved ions are replaced by other, more desirable, ions of a similar electrical charge. If you’re wondering whether IX is right for your ...


    By SAMCO Technologies, Inc.

  • Potential of carbon nanotubes in water purification: an approach towards the development of an integrated membrane system

    The problems of water shortages and lack of access to safe drinking water have been and will continue to grow as major global problems. To alleviate these problems, water purification technologies are being updated. Recent years have witnessed impressive breakthroughs towards practical application of nanostructured materials such as Carbon Nanotubes (CNTs) in the field of water purification owing ...


    By Inderscience Publishers

  • Reverse Osmosis: How Does It Figure Into a Dialysis Water System?

    Better than 95% of all dialysis centers use water purification equipment to purify water for dialysis. The centerpiece of these water purification systems has become reverse osmosis. In conjunction with sound pretreatment, RO has proven itself to be the safest, most reliable, and most economical method of purifying water for dialysis. Water plays an important, life-sustaining role for dialysis ...

  • Breakthrough studies with mono-, binary- and ternary-ion systems comprised of Fe(II), F and As(III) using river sand packed columns for groundwater treatment

    Groundwater in Assam, India, contains excessive amounts of arsenic (As(III)), fluoride (F−) and iron (Fe(II)). The rural and semi-urban population of Assam uses indigenous iron filters fabricated using processed sand (PS) as one of the chief constituents to reduce Fe(II) concentration; however, no efforts have been made to reduce As(III) or F− concentrations before use. ...


    By IWA Publishing

  • Homemade bone charcoal adsorbent for defluoridation of groundwater in Thailand

    High levels of fluoride in groundwater are a significant environmental and health problem in Thailand, as in many parts of the world. Small household defluoridators have several advantages over centralized treatment systems. In Thailand, however, use of bone char for water treatment has met resistance because of objectionable taste and odours of the water produced and the social resistance to ...


    By IWA Publishing

  • Evaluation of the flocculation and de-flocculation performance and mechanism of polymer flocculants

    Understanding the interaction mechanism between polymeric flocculants and solid particles in two oppositely charged solutions: bentonite and calcium fluoride, is of great practical and fundamental importance. In this work, inorganic flocculants based on aluminum(III) or iron(III); cationic, anionic and non-ionic organic flocculants were used. The solution pH, which highly influenced the ...


    By IWA Publishing

  • Electrochemical decomposition of fluorinated wetting agents in plating industry waste water

    Electrochemical decomposition of fluorinated surfactants (PFAS, perfluorinated alkyl substances) used in the plating industry was analyzed and the decomposition process parameters optimized at the laboratory scale and production scale of a 500-liter reactor using lead electrodes. The method and system was successfully demonstrated under production conditions to treat PFAS) with up to 99% ...


    By IWA Publishing

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