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tower scrubber Applications

  • 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).

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    Cement

    MEGTEC's extensive scrubber experience applies to the cement manufacturing process for the effective control of SO2 and HCl by the injection of lime slurry. Our customers can achieve up to 90% reduction of SO2 and 98% reduction of HCl using microfine or standard lime. The TurboSorb Spray Dryer Absorber (SDA) can often retrofit into an existing gas conditioning tower, or downcomer duct, to avoid the high cost of new capital equipment.

    By Babcock & Wilcox MEGTEC based in De Pere, WISCONSIN (USA).

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    Applications and Air Pollutants Removed for Wastewater Treatment Operations

    For industrial and municipal treatment plants; Chemical scrubbers, biological towers and adsorption systems to remove hydrogen sulfide, mercaptans, other organic sulfur compounds and ammonia from digesters, pump stations, ponds, grit and screening works, sludge filter presses and dryers. Special Wet Electrostatic Precipitator for sewage sludge incinerators. Stripping ammonia and other volatile compounds. Decarbonization removal of carbon dioxide from wastewater.

    By Bionomic Industries Inc. based in Mahwah, NEW JERSEY (USA).

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    Fiberglass Reinforced Plastic (FRP) Equipment for Mining & Metallurgy Industry

    Zhongyi engineers and manufacturers quality FRP equipment for mining and metallurgy industry, such as:  Mixer settlers, Electrowinning cells, Electrostatic precipitators. Storage tanks, CCD Vessels, Ducting, fans and dampers. Scrubbers, Clarifiers, Absorbers and Venturi. Cooling towers, Weirs, Abrasion resistant piping. Reactors, Cell covers, Fume stacks and stack liners. Dust control systems, Walkway grating, railing and stairways.

    By Zhongyi GRP Industrial based in Jizhou, CHINA.

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