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biological sewage water treatment Applications

  • Biological waste water treatment plants solutions for municipalities

    A wide variety of sludge, including municipal sewage sludge, are treated in anaerobic digesters.

    By HydroThane STP BV based in KC `s Hertogenbosch, NETHERLANDS.

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    Filtration technology for Industrial wastewater treatment

    AQQA is used in industrial wastewater treatment to: separate the sludge from the clear water in membrane bio reactors. constitute the final filtration of the effluent of standard sewage treatment plants (tertiary treatment). keep specialized bacteria in the system, that can biologically degrade organic matter. enable Zero Liquid Discharge: prefiltration for reverse osmosis systems.

    By Weise Water GmbH based in Hennigsdorf, GERMANY.

  • 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).

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    Sludge Dewatering

    The waste-sludge generated by primary and secondary (biological) treatment of municipal & industrial wastewater needs to be managed at every plant big or small. In the larger sewage treatment facilities waste sludge thickening and dewatering has always been assumed a necessity without the planners and designers thinking twice about the cost requirements. In the smaller and decentralized STP’s where available investment is always lower, the on-site waste-sludge management (thickening & dewatering) maybe compromised due to the high cost of investment, largely due to the comparative high cost of facilities (building, equipment, piping, auxiliaries, etc). The DEVISE “Containerized Sludge Dewatering Plant” (CSDP) provides a first class solution for the small STP’s at a reasonable cost and most importantly it comes in a fully automated package unit that is ready to “plug & play”.

    By DEVISE ENGINEERING S.A. based in Athens, GREECE.

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