Electrochlorination Applications

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  • Category: Water & Wastewater ×

  • Subcategory: Electrochlorination ×

Water Disinfection for Municipal Water Treatment

by MIOX Corporation     based in Albuquerque, NEW MEXICO (USA)

As one of the world`s most precious natural resources, the reuse of water is becoming increasingly important. MIOX is both the most cost-effective solution and the preferred technology for disinfection and oxidation of wastewater for reuse or reintroduction into the environment. MIOX`s hypochlorite generators offer a safer, technologically superior solution to wastewater treatment, virtually eliminating many of the negative problems associated with traditional chlorine disinfection. Safer, economical and significantly more effective, MIOX is revolutionizing the process of making water safe again.

Odor Scrubbers Applications with Hydrogen Peroxide

by USP Technologies     based in Atlanta, GEORGIA (US) (USA)

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.

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