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Activated Sludge Applications

  • Headworks Odor and Corrosion Control Using Hydrogen Peroxide

    Hydrogen Peroxide typically controls odors and corrosion at treatment plant headworks by direct oxidation of hydrogen sulfide (H2S) within the wastewater. In the direct oxidation mode, H2O2 is applied to the wastewater 5-30 minutes prior to the point where the odors are being released, generally as the wastewater line enters the plant boundary. The efficiency of hydrogen peroxide treatment depends upon the available reaction time, the level of iron in the wastewater (reaction catalyst), wastewater pH and temperature, and the initial and target levels of H2S odor. Under optimal conditions, effective dose ratios are 1.2 - 1.5 parts H2O2 per part dissolved sulfide, and can be reliably estimated through beaker tests. H2O2 + H2S → S0 + 2H2O Frequently, control of odors through the primary clarifiers is wanted. In such case, the mechanism of control is both direct oxidation of H2S (as it rises from the solids blanket), and prevention of odor generation (by supplying dissolved oxygen). Control is typically achieved with a booster dose of 1-2 mg/L H2O2 added to the clarifier influent. Higher doses or alternate modes of addition may be required in cases where: 1) hydraulic retention times are > 2-3 hours; 2) solids blanket depths are > 1-2 feet; 3) soluble BOD levels are > 200-300 mg/L; or 4) waste activated sludge is co-settled with the primary solids. 2H2O2 → O2 + 2H2O

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

  • Waste water monitoring solutions for wastewater treatment industry

    Improved waste management through automation can deliver more efficient waste treatment, reduced energy and chemical consumption and improved effluent quality. The cost of treatment and trade discharge can thus be significantly reduced.

    By Pollution & Process Monitoring Ltd based in Sevenoaks, UNITED KINGDOM.

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    Treatment, Optimization and Design for WWTP's

    The purpose of the work is to demonstrate the rationale, procedures and advantages of using process simulation to evaluate the steps involved in process upgrades from conventional or fully aerobic process conditions to multi stage systems capable of operating as a BNR system. In the author's experience and the conclusions of this presentation are that the use of these systems in daily operations and in the preparation for process upgrading is empowering and economically advantageous. SASSPRO(Steady State Activated Sludge Simulator, Program)

    By LLC based in Sahuarita, ARIZONA (USA).

  • Waste processing and composting solutions for waste and recycling industry

    QM Environmental Services offers a range of products that can help to improve the processing and composting of organic waste forms or to solve odour problems associated with the transport, storage and processing of waste in general

    By QM Environmental Services Ltd. based in The Hague, NETHERLANDS.

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    Chemical Water Treatment for waste water

    Kurita develops products and solutions for the waste water treatment to improve the water quality and respect the legislation and the environment. Due to increased environmental sensitivity and today’s legislative restrictions, most industrial plants which use water already have wastewater treatment plants. The different Kurita Technologies carefully adapts to the needs of each plant through the optimization and improving the water quality and reducing your operating costs. Improve the water reuse in your facilities and work closely with our customers to reduce the discharges to a minimum level is one of our main targets.

    By Kurita based in Ludwigshafen, GERMANY.

  • Chlorine dioxide treatment for rendering

    Odor Control: Chlorine dioxide controls odors by destroying hydrogen sulfide through chemical oxidation.  Using an odor scrubber, chlorine dioxide solutions may be added directly to water containing the odorous compound for quick and cost-effective oxidations.

    By DuPont Chlorine Dioxide based in North Kingstown,, RHODE ISLAND (USA).

  • Waste water respirometry solutions for toxicity testing

    If industrial wastewater entering a treatment works contains toxic components the rate of biodegradation will be inhibited or stop completely. This can result in failed consents and will certainly give rise to operational problems. Visible indications include deflocculation, bulking and the appearance of filamentous bacteria. Sometimes, there are no visible effects. When the sludge bacteria are inhibited, there is the possibility of toxicity carryover in the effluent that is discharged to receiving waters. With new environmental legislation being introduced, worldwide, to protect the natural environment, toxin discharge is now a serious concern for treatment plant managers.

    By Strathkelvin Instruments Ltd. based in Motherwell, UNITED KINGDOM.

  • Filamentous Bulking Control with Hydrogen Peroxide

    Basis of Control with Hydrogen Peroxide Hydrogen peroxide may be used to correct a serious filamentous bulking situation or, preferably, to prevent one from occurring until adjustments can be made to remove the cause. When applied to the return activated sludge, hydrogen peroxide supplies dissolved oxygen which helps restore the microbial activity necessary for effective operation, while selectively oxidizing the filaments which retard settling. The effective dose of hydrogen peroxide is a function of time and concentration, and varies from plant to plant. To correct a serious bulking problem, immediate results may be obtained by adding 100 - 200 mg/L H2O2 to the biosolids recycle line. Once control of bulking is obtained, the dose may be reduced to 25 - 50 mg/L H2O2 to prevent re-occurrence. Practical Considerations Filamentous bulking of municipal activated sludge is not a normal occurrence, and suggests more fundamental problems may be at work (e.g., low dissolved oxygen, high sulfide input, heavy organic loading, nutrient imbalance, improper sludge age, or rapid changes in influent characteristics). Consequently, the use of chemicals such as hydrogen peroxide to control bulking should be pursued in concurrently with more fundamental corrective measures.

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

  • Waste water respirometry solutions for monitoring activated sludge health - sour test

    Respiration rate monitoring of Antwerp treatment works showed periods when the activated sludge was up to 40% inhibited, with resultant sludge washout episodes. Using the Health monitoring test, a pattern of ‘normal’ respiration rates for a plant can be determined. Lower respiration rates will alert the treatment works to a chronic toxicity problem, allowing corrective actions to be taken. Toxicity monitoring can now be carried out on a routine daily basis, at all treatment works receiving potentially toxic wastewaters. This is especially important if there has been a history of poor plant performance.

    By Strathkelvin Instruments Ltd. based in Motherwell, UNITED KINGDOM.

  • Microbial formulations for municipal sector

    MICROCAT microbial formulations from Bioscience, Inc., are blends of specialized, naturally occurring microbes and other ingredients that work together to solve the most common, damaging problems inherent to municipal wastewater plants. By augmenting existing microbial populations, MICROCAT products naturally aid in stabilizing municipal sewage treatment and collection systems, enhancing their ability to break down difficult-to-degrade wastes and handle highly variable waste treatment conditions.

    By Bioscience, Inc. based in Allentown, PENNSYLVANIA (USA).

  • Ozone Water Treatment for Activated Sludge Process Plants

    Ozone breaks up filaments and improves settling characteristics of the sludge... Filamentous sludge is a common problem at activated sludge plants. With ozonation of the return sludge flow it is possible to reduced the amount of filamentous bacteria in the sludge and significantly increased the settling properties of the sludge.This in turn means better performance of the activated sludge process. When a bioreactor is connected to the sludge line the removal of the damaging filamentous bacteria means higher quality sludge in the bioreactor, which leads to higher biogas production.

    By Primozone Production AB based in Löddeköpinge, SWEDEN.

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    Real-time Control System for Wastewater Treatment Plants

    Wastewater treatment plants (WWTP) are subject to large variation in flow and load, not to speak of uncertainties on the composition of the incoming wastewater. On top of that, the activated sludge treatment process, as used by the vast majority of treatment plants, is difficult to control due to the complex behaviour of the biological process. Nevertheless WWTPs are run 24/7, with operators and management challenged to meet ever tightening environmental regulations.

    In order to meet the operational demands of modern-day plants, a new control system was developed. Proprietary control algorithms were introduced based on a large set of data from nutrient measurements in various WWTPs. The customer`s benefits are twofold: (1) achieving optimum effuent quality and, at th same time, (2) lowering energy needs and dosing of commidity chemicals.

    By AppliTek NV based in Nazareth, BELGIUM.

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    Hazardous waste treatment solutions for chlorine industry

    The mercury cell process is a formerly widely-used production technique for the production of chlorine and caustic soda. The liquid metal, mercury, acts as cathode (negative pole) in this process. In the past, the loss of mercury during the process (to air, soil and water) led to serious health and environmental problems. Therefore, most European chlorine producers have decided to phase out the mercury cell process by 2020. Nevertheless, even today, almost 6000 tons of mercury is used per year for chlorine production in Europe alone. As a result of this, yearly waste outputs contain around 1200 tons of mercury, which are stored on-site or sent off for disposal.

    By econ industries GmbH based in Starnberg, GERMANY.

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