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acidic wastewater treatment Applications

  • Solutions for wastewater treatment industry

    Sodium Hypochlorite. Sodium Hydroxide (Caustic Soda) 20%-50%. Sodium Bisulfite. Hydrochloric Acid. Lime. Chlorine. Soda Ash. Sulfur Dioxide. Sulfuric Acid. Citric Acid. Aluminum Sulfate. Permanganate.

    By Carus Corporation based in Peru, ILLINOIS (USA).

  • Industrial water softening

    The presence of certain metal ions in water causes a variety of problems. These ions interfere with the action of soaps, lead to build up of limescale, which can foul plumbing, boilers, heating equipment. Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water extends the lifetime of plumbing and heating equipment. Softening of low TDS ( Total Dissolved Solids ) water is done commonly with a Strong Acid Cation ( SAC ) exchange resin operating in the sodium form and regenerated with brine. PuriTech`s latest development is a very performant continuous ion exchanger, based on PuriTech`s innovative ION-IX technology which is based on true counter-current ion exchange.

    By PuriTech Ltd based in Herentals, BELGIUM.

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    Ultraviolet disinfection systems for the produced water treatment

    With environmental regulations becoming more stringent, and the link between re-injected water quality and operational costs becoming clear to operators, investing early in advanced water treatment solutions for produced water for both reinjection applications and environmental discharges is now a top priority for operators worldwide.  atg UV Technology have provided a number of specialist UV packages for the disinfection of Produced Water in order to reduce microorganisms such as SRB’s (Sulphate Reducing Bacteria), Acid Producing Bacteria and Slime Forming Bacteria, that if left untreated, pose a range of negative consequences including: - Souring the well with hydrogen sulphide gas H2S, Microbiological induced corrosion, Loss of fluid stability during injection, Plugging of the well, Damage of equipment and components (e.g. RO membranes, filters).

    By atg UV Technology based in Wigan, UNITED KINGDOM.

  • Environmental technology for water treatment industry

    In many fields of water treatment Körting ejectors are applied as gas introducing systems; Waste water aeration in aeration tanks and SBR-Plants. Introducing ozone or oxygen. Pressurised dissolved air flotation. Disinfection of potable water and de-acidification.  Further applications are: Diluting and conveying acids and lye during the process of regenerating ion exchangers.

    By Körting Hannover AG based in Hannover, GERMANY.

  • Cyanide Treatment with Hydrogen Peroxide

    Cyanides are used in a number of chemical synthesis and metallurgical processes (as simple salts or cyanide complexes). As a class, cyanides are highly toxic and must be destroyed or removed from wastewaters prior to discharge. The most common method for treating free or simple cyanide is alkaline chlorination. However, chlorination of cyanide results in highly toxic intermediates (e.g., cyanogen chloride) and, if organic material is present, chlorinated VOC’s. These compounds, together with the residual chlorine, create additional environmental problems. Consequently, there is a growing need for alternative, non-chlorine methods for destroying cyanides. Peroxygen compounds such as hydrogen peroxide, peroxymonosulfuric acid (1), and persulfates (1) are effective alternatives to alkaline chlorination for destroying free and complexed cyanides. The choice of peroxygen system depends on the reaction time available, the desired products (cyanate, or CO2 and NH3), the types of cyanides being treated (free, weak acid dissociable, or inert), and the system economics. Treatment with Hydrogen Peroxide While hydrogen peroxide will oxidize free cyanide, it is common to catalyze the reaction with a transition metal such as soluble copper, vanadium, tungsten or silver in concentrations of 5 to 50 mg/L (2).

    By USP Technologies based in Atlanta, GEORGIA (US) (USA).

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    Oxidation Reduction Potential (ORP)/Redox

    Oxidation Reduction Potential or Redox is the activity or strength of oxidizers and reducers in relation to their concentration. Oxidizers accept electrons, reducers lose electrons. Examples of oxidizers are: chlorine, hydrogen peroxide, bromine, ozone, and chlorine dioxide. Examples of reducers are sodium sulfite, sodium bisulfate and hydrogen sulfide. Like acidity and alkalinity, the increase of one is at the expense of the other.

    By Myron L Company based in Carlsbad, CALIFORNIA (USA).

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    Chemical Water Treatment for cleaning

    Deposits in water systems, especially in heat exchangers, result in a significant heat transfer reduction, in low efficiency and a loss of cooling capacity. Some systems, after long operational periods without any water conditioning or with inadequate treatment, need cleaning. Therefore Kurita Water Solutions proposes acidic, alkaline and neutral cleaners to remove deposits, scale, fouling, dirt, grime or impurities.

    By Kurita based in Tokyo, JAPAN.

  • Sulfide Oxidation with Hydrogen Peroxide (H2O2)

    Sulfide Odor Control Sulfide is found throughout the environment as a result of both natural and industrial processes. Most sulfide found in nature was produced biologically (under anaerobic conditions) and occurs as free hydrogen sulfide (H2S) - characterized by its rotten egg odor. We are most likely to encounter biogenic H2S in sour groundwaters, swamps and marshes, natural gas deposits, and sewage collection/treatment systems. Manmade sources of H2S typically occur as a result of natural materials containing sulfur (e.g., coal, gas and oil) being refined into industrial products. For a variety of reasons - aesthetics (odor control), health (toxicity), ecological (oxygen depletion in receiving waters), and economic (corrosion of equipment and infrastructure) - sulfide laden wastewaters must be handled carefully and remediated before they can be released to the environment. Typical discharge limits for sulfide are < 1 mg/L. Sulfide Treatment Alternatives There are dozens of alternatives for treating sulfide laden waters, ranging from simple air stripping (for the low levels present in groundwaters) to elaborate sulfur recovery plants (used to treat several tons per day at refineries and coal burning power plants). There are processes based on biology (using compost filters, scrubbing media, or inhibition/disinfection), chemistry (oxidation, precipitation, absorption, and combination), and physics (adsorption, volatilization, and incineration). Each process occupies a niche which is often defined by the scale and continuity of treatment, whether the sulfide is in solution or is a gas, the concentration of sulfide involved, and the disposition of the sulfide containing medium. However, for reasons relating to convenience and flexibility, chemical oxidation (using hydrogen peroxide) continues to grow in its scope of application. Treatment with Hydrogen Peroxide While other peroxygens such as permonosulfuric (Caro’s) acid, peracetic acid, and persulfates will oxidize sulfide, their use for this application is overkill. Hydrogen peroxide (H2O2) is considerably simpler and more cost-effective. H2O2 may control sulfides in two ways, depending on the application: Prevention - by providing dissolved oxygen which inhibits the septic conditions which lead to biological sulfide formation; and Destruction - by oxidizing sulfide to elemental sulfur or sulfate ion.

    By USP Technologies based in Atlanta, GEORGIA (US) (USA).

  • Wastewater treatment solutions for anaerobic sludge digestion sector

    Anaerobic digestion is a series of processes in which microorganisms break down biodegradable material in the absence of oxygen, used for industrial or domestic purposes to manage waste and/or to release energy. It is widely used as part of the process to treat wastewater, like Upflow Anaerobic Sludge Blanket (UASB) reactors. As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere. Anaerobic digestion is widely used as a renewable energy source because the process produces a methane and carbon dioxide rich biogas suitable for energy production, helping to replace fossil fuels. The nutrient-rich digestate which is also produced can be used as fertilizer. The digestion process begins with bacterial hydrolysis of the input materials in order to break down insoluble organic polymers such as carbohydrates and make them available for other bacteria. Acidogenic bacteria then convert the sugars and amino acids into carbon dioxide, hydrogen, ammonia, and organic acids. Acetogenic bacteria then convert these resulting organic acids into acetic acid, along with additional ammonia, hydrogen, and carbon dioxide. Finally, methanogens convert these products to methane and carbon dioxide.

    By QM Environmental International B.V. based in The Hague, NETHERLANDS.

  • Chemical Oxygen Demand (COD) Analyzer for Industrial & Municipal Wastewater Industry

    MANTECH’s game-changing water quality analysis technology is revolutionizing wastewater treatment at industrial and municipal facilities worldwide. The PeCOD Analyzer provides accurate chemical oxygen demand (COD) results and biochemical oxygen demand (BOD) estimates within minutes rather than the hours or days required for standard COD and BOD testing — without the use of dichromate, mercury, acids and other harmful chemicals.

    By MANTECH Inc. based in Guelph, ONTARIO (CANADA).

  • Water treatment research for mining industry

    Securing a reliable supply of water for extraction, handling and transportation is vitally important to mining companies looking to expand their operations. These companies will go to great lengths to meet this need, running pipelines hundreds of miles long from desalination plants on the coast and treating wastewater that is conventional held in tailings ponds. Wastewater treatment technologies can recover saleable metal that might otherwise be lost and prevent environmental contamination from highly acidic effluent streams. Developing the infrastructure and technologies to meet these challenges in the mining industry is driving a market worth $11.9 billon.

    By Global Water Intelligence (GWI) based in Oxford, UNITED KINGDOM.

  • Waste water respirometry solutions for toxicity reduction tests

    In industrial manufacturing companies, before a new process comes on-line, it is important to measure the toxicity of the effluent stream. This is especially the case for companies who treat their own waste. From the toxicity value (EC50) obtained, it may be a cost-effective solution to simply discharge the effluent to the treatment works at a slow and defined rate to minimise damage to the activated sludge. Following a period of acclimatisation it is often possible to increase feed rates to the plant and this can again be managed using the Strathtox Respirometer. An alternative approach is to undertake toxicity reduction procedures, such as neutralisation or acid hydrolysis, in pilot-scale laboratory studies. The Respiration or the Nitrification Inhibition Test may be used for this. In the future, toxicity reduction may be stipulated by local authority, water company or publicly-owned treatment works prior to giving discharge consents. Toxicity reduction may be evaluated using toxicity tests on activated sludge provided by the treatment works.

    By Strathkelvin Instruments Ltd. based in North Lanarkshire, UNITED KINGDOM.

  • Activated Carbon Filtration for the Water Filtration Industry

    General Carbon carries a complete line of activated carbon made from coal, coconut shell and wood for most liquid phase applications.  These include acid washed activated carbon for drinking water and food grade applications as well as products suitable for waste water remediation, decolorization applications, chemical and pharmaceutical purification. Additionally, our specialty medias are best for the treatment of non-emulsified oils and heavy metals. Our stock of activated carbon for liquid phase applications are all NSF certified, meaning that they are approved for treatment of food grade applications.


    By General Carbon Corp. based in Paterson, NEW JERSEY (USA).

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