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composting process Applications

  • 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.

  • Cellulose Degradation & Composting

    Composting of Green Wastes: Reduction in the time to complete the composting process. Reduction in the weight, volume and odour of the compost material.

    By Cleveland Biotech Ltd. based in Stockton on Tees, UNITED KINGDOM.

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    Recycling and Composting

    The treatment processes in recycling plants generate unpleasant and often harmful dust, which is a health hazard not only for nearby residents, but particularly for the employees. More and more legislation is being passed on dust control requiring such in the form of mobile units or fixed installations. In composting processes, the dust problem is compounded by unpleasant odors, which can be controlled effectively with specialized equipment. The same units are also used in biogas plants or for the removal and disposal of contaminated soil from industrial sites.

    By EmiControls based in Bolzano, ITALY.

  • Organic waste recycling for the composting industry

    Vermeer and Wildcat have led the way into these new industries with organic recycling equipment that processes organic waste quickly and efficiently, so that it can be turned into useful end product. Vermeer compost turners, horizontal grinders, tub grinders and Wildcat compost turners and trommel screens are built to last and fully supported with parts and service from your local dealer. 

    By Vermeer based in Pella, IOWA (USA).

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    Recycling equipments for shredding solid waste & municipal solid waste

    Solid waste and municipal solid waste (MSW) size reduction requires processing of many different materials, from filled drums to household waste. And, as the amount of solid waste increases and the cost of landfill management increases, it is becoming more critical that waste management become more effective, economic and efficient. Shredded and compacted waste is easier and cheaper to transport and extends the life of the landfill. In addition, separating out materials that can be reclaimed and recycled or that need to be incinerated or composted increases the landfill productivity while providing revenue to offset the costs of processing the solid waste.

    By Granutech-Saturn Systems based in Grand Prairie, TEXAS (USA).

  • Odor Scrubbers Applications with Hydrogen Peroxide

    Hydrogen Peroxide as a Replacement for Sodium Hypochlorite Hydrogen peroxide may be used in both mist scrubbers and packed tower scrubbers as a replacement for sodium hypochlorite (bleach). Like bleach, the process involves two concurrent mechanisms: 1) absorption of the odors (H2S) into the alkaline scrubbing solution; and 2) oxidation of the absorbed sulfide in solution. Step 1: H2S + NaOH → NaSH + H2O Step 2: 4H2O2 + H2S → H2SO4 + 4H2O Typical dose ratios are 5 parts H2O2 per part H2S or, when used in place of bleach, one gallon 50% H2O2 for every 10 gallons of 15% sodium hypochlorite (NaOCl). This generally translates into a break-even cost scenario. Sufficient caustic soda (NaOH) is added to maintain a pH of 10.0 - 10.5 in the scrubbing solution. There is also in practice a process which uses H2O2 in series with bleach to scrub composting odors. This process relies on a series of three packed tower scrubbers: the first is a pH neutral water wash (to remove ammonia and amine odors); the second uses a conventional caustic/bleach solution in which the bleach is purposely overdosed (to oxidize the complex organic sulfur odors); and the third uses a caustic/H2O2 solution (to remove the unreacted chlorine vapors carried over from the second stage). H2O2 + HOCl → HCl + H2O + O2 Typical dose ratios are 0.5 parts H2O2 per part hypochlorite (OCl-), with sufficient caustic soda (NaOH) added to maintain a pH of 8.5 in the scrubbing solution.

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

  • 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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