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 ...

  • 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 ...

  • 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

  • Phosphate Fertilizer Plants Industry - Pollution Prevention Guidelines

    Introduction Pollution Prevention Guidelines to provide technical advice and guidance to staff and consultants involved in pollution-related projects. The guidelines represent state-of-the-art thinking on how to reduce pollution emissions from the production process. In many cases, the guidelines provide numerical targets for reducing pollution, as well as maximum ...


    By The World Bank

  • Particulate matter, halogen and aerosols - Case Study

    Example: Production of anodes for aluminium smelters as well as electronic industry (TFT-LCD) Similar tasks: Carbon and graphite industry, smelting of aluminium, coating of metals An anode producer has several ring furnaces to stabilise the anodes by carbonization for later processing in a melting bath. The hot exhaust gases pass through double walls in between the anodes where the gases ...

  • Metal finishing - Columbia manufacturing company - case study

    Application Columbia Manufacturing Company of Westfield, Massachusetts began producing bicycles in 1877. The company, while still producing bicycles, transitioned its core product line to institutional furniture with chrome plated bases made from tubular steel. Large amounts of potable water were required for the old plating system. The company was using 180,000 gallons of potable water a ...


  • Case study - Doe Run Peru – Improving productivity with environmental responsibility

    Doe Run Peru aims to become a preferred global provider of premium metals and services, while at the same time working to operate in a socially and environmentally responsible way. The mining and metals company employs roughly 4,000 people at its operations in Peru’s central Andes. The company has run the La Oroya metallurgical complex since 1997 and the Cobriza mine in the Huancavelica ...


    By Beltran Technologies, Inc.

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