chemical dosing Articles

  • Microsieving in primary treatment: effect of chemical dosing

    Primary and chemically enhanced primary wastewater treatment with microsieving (disc or drum filtration) was studied at the large pilot scale at seven municipal wastewater treatment plants in Europe. Without chemical dosing, the reduction of suspended solids (SS) was (on average) 50% (20–65%). By introducing chemically enhanced primary treatment and dosing with cationic polymer only, SS ...


    By IWA Publishing

  • Chemical dosing and blending - the role of precision actuators

    Overview Chemical dosing is the introduction of a measured quantity of a chemical into a process fluid so that a chemical reaction occurs in the process fluid or a particular blend of fluids is achieved. ...


    By Rotork plc

  • Verder UK Ltd Chemical Dosing Open Day

    Verder UK Ltd will be hosting an open day allow all customers and those looking for a chemical dosing solution to see first-hand how the Verder Project Team can meet their requirements. ...

  • Phosphate removal without chemical dosing from Virotec

    In this article Simon Tillotson, General Manager at Virotec Europe Limited, explains how the Company’s new innovative Bauxsol™ technology is produced, the nature, characteristics and formulation of the product range and how the product works. He outlines applications for Bauxsol™ technology in the water and environmental sector. Simon concentrates specifically on using Bauxsol™ for phosphate ...


    By Clarity Authoring

  • Relationships between exposure and dose in aquatic toxicity tests for organic chemicals

    There is continuing debate about the merits of exposure‐based toxicity metrics such as median lethal concentration (LC50) versus organism‐based metrics such as Critical Body Residue (CBR) as indicators of chemical toxicity to aquatic organisms. To demonstrate relationships and differences between these two metrics we apply a simple one‐compartment toxicokinetic mass‐balance model for ...


    By John Wiley & Sons, Ltd.

  • Observing the effects of digestion and chemical dosing on the calorific value of sewage sludge

    New legislation being introduced in Europe for the removal of the macronutrients nitrogen and phosphorous is causing the fundamental composition of sludge to change. Nitrogen removal requires longer residence times during activated treatment, and phosphorous removal can involve the supplementation of chemicals such as ferric. In addition, there is increasing pressure to capture energy from sludge ...


    By United Utilities

  • Effect of iodine chemical form on thyroid doses during a severe accident

    In most of the accidents that may occur in nuclear reactors, the short-term radiological consequences are expected to be dominated by isotopes of iodine. The assessment of doses resulting from iodine release during a severe reactor accident requires knowledge of the iodine chemical forms and removal mechanisms prior to the release to the environment. In this paper, the arguments concerning iodine ...


    By Inderscience Publishers

  • Chemical stress from Fe salts dosing on biological phosphorus and potassium behavior

    In simultaneous precipitation, interaction between chemical and biological P removal could not be ignored. This work investigated effects of ferrous sulfate and Fe precipitates on metabolic behavior of bio-P and its counter cation of potassium. After dosing, mixed liquid suspended solids (MLSS) increased 9%, pH decreased from 7.35 to 7.00, sludge volume index (SVI) decreased, electrical ...


    By IWA Publishing

  • Chemically enhancing primary clarifiers: model-based development of a dosing controller and full-scale implementation

    Chemically enhanced primary treatment (CEPT) can be used to mitigate the adverse effect of wet weather flow on wastewater treatment processes. In particular, it can reduce the particulate pollution load to subsequent secondary unit processes, such as biofiltration, which may suffer from clogging by an overload of particulate matter. In this paper, a simple primary clarifier model able to take ...


    By IWA Publishing

  • Controlling chemical dosing for sulfide mitigation in sewer networks using a hybrid automata control strategy

    Chemicals such as magnesium hydroxide (Mg(OH)2) and iron salts are widely used to control sulfide-induced corrosion in sewer networks composed of interconnected sewer pipe lines and pumping stations. Chemical dosing control is usually non-automatic and based on experience, thus often resulting in sewage reaching the discharge point receiving inadequate or even no chemical dosing. Moreover, ...


    By IWA Publishing

  • Automated dosing of dry treatment chemical with flexible conveyor improves accuracy, safety of filtration system

    Oberlin Filter Company is a global leader in high pressure flat-bed, liquid-solid filtration systems for demanding applications such as filtering heavy metals and resins from colloidal suspensions. The company's top-of-the-line DMax™ filtration system, which cleans 'impregnation resin' wastewater, requires a dry chemical delivery system that provides more precise, cleaner, and safer dosing than ...


    By Flexicon Corporation

  • The role of chemical products at low doses in preventing the proliferation of bacteria in dental unit waterlines: the ICX® experience

    In this study we evaluated (1) the efficacy of a protocol that combines hydrogen peroxide (shock treatment) and ICX® tablets (continuous treatment) for the control of microbial contamination in dental unit water lines, and (2) the in vitro antimicrobial activity of ICX® tablets on collection and wild strains isolated from dental chair output waters. To assess the ...


    By IWA Publishing

  • A practical approach to determine dose metrics for nanomaterials

    Doses of conventional chemical substances in toxicity studies are traditionally described by administered mass. For deriving toxic doses of nanomaterials, mass and chemical composition alone may not be an adequate description of the dose as particles with the same chemical composition can have completely different toxic mass doses, depending on properties such as particle size. Other dose ...


    By John Wiley & Sons, Ltd.

  • Chemical blending is the most frequent kind of chemical process

    Chemical blending is one of frequent kind of chemical process that is commonly used in application. The procedure of mixing can potentially save  manufacturers time, labor, inventory, and transportation costs. Organic and inorganic chemicals can be blended. Substance could be blended in liquid form to a variety of pH levels and viscosities. This services ...

  • The challenge of multiple chemical sensitivity

    Environmental health professionals frequently come across a health-related problem with no clear cause-and-effect relationship. A typical case occurs when a person complains of experiencing symptoms, often in an indoor setting, that may vary from vague to severe. Multiple Chemical Sensitivity (MCS) may be a factor at play in some of these situations. The condition is characterized by persistent ...

  • Chemical industries - Products that shine

    Kiilto Oy (‘Shine’ in English) is an old and established chemical industry company south of Tampere, Finland. Kiilto was founded already in 1919 and has since then grown steadily to a middle-sized producer of glues and many other products for industrial and consumer applications. The total number of Kiilto products is close to a thousand. Kiilto also has expanded to foreign countries ...


    By Kopar Oy

  • Intrinsic Biodegradation Kinetics Of Chemicals

    Intrinsic Biodegradation Kinetics Of Chemicals An understanding of the rate of biodegradation kinetics for specific industrial chemicals is useful when evaluating their treatability or their impact on treatment processes. The objective of kinetic assessments usually is to model the biodegradation reactions for specific chemicals using either pure cultures or defined ...


    By Challenge Technology

  • How to prepare for a chemical attack

    It is a shocking and sad reality that chemical attacks are happening in the world today. The threats continue to rise as global tensions become greater. It can only be a good thing to be prepared if one was to occur in your area. The first step in preparation is to understand more about what chemical attacks are. What are chemical attacks? Chemical attacks involve using toxic ...


    By Fast-ACT

  • In vitro biotransformation rates in fish liver S9: Effect of dosing techniques

    In vitro biotransformation assays are currently being explored to improve estimates of bioconcentration factors of potentially bioaccumulative organic chemicals in fish. This study compares thin‐film and solvent‐delivery dosing techniques, as well as single vs. multiple chemical dosing for measuring biotransformation rates of selected polycyclic aromatic hydrocarbons in rainbow trout ...


    By John Wiley & Sons, Ltd.

  • INNOVATIVE CHEMICALS FOR DETERIORATED RO MEMBRANES

    The new rejuvenation chemical treatment is introduced in this paper. This chemical treatment repairs the deteriorated RO membranes, and recovers the salt rejection ratio immediately. In the past, such kind of rejuvenation methods have been developed and reported only with table test basis and pilot plant test basis as seen in the IVREFERENCES ...


    By Kurita

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