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Case study - The Capital - STP exhaust air AHU ozonation

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Basement or Underground Sewage Treatment Plant [STP] or Organic Waste Composer [OWC] Exhaust Air Ozonation for Foul Odor of Ammonia & H2S oxidation.

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Case study - The Capital - STP exhaust air AHU ozonation

  1. 1. STP Odor Destruction By ozone oxidation The Capital (Wadhwa Group)– BKC (mumbai) Case Study
  2. 2. INDEX 1. Site Data 2. Present Scenario 3. Objective 4. Offered Solution & Technology 5. General Arrangement Layout & site pictures 6. Implementation 7. Safety 8. Operation & Maintenance 9. Consumables & Replacements 10. Ref.-Ozone Chemistry
  3. 3. Site Data : STP Capacity : 350 KLD STP Area & Height : 300 m² x 6.0 m AHU – Air flow : 19,000 cfm (32,200 m3/hr) Air Flow : Intermittent [Automatic] AHU Duct Size & Length : 600 x 600 mm x 20 m Air Changes per Hour : 18 - 20 nos.
  4. 4. Present Scenario : Sewage Collection Tank & STP Room: Raw sewage is entering the raw sewage collection tank & being treated by sewage treatment plant. Since STP is in basement area, appropriate ventilation is provided. Where fresh air is fed from ground level & exhaust air is being exhausted in car park area.
  5. 5. Objective : 1. Prevent foul sewage odor to spread in car park area & subsequently to surrounding receiving atmosphere. 2. Destroy odor causing gases coming from STP room.
  6. 6. Offered Solution & Technology :  AHU duct air ozonation.  Ozone is a very strong oxidizing agent.  All foul odor generated from sewage are organic in nature, and can very easily be oxidized (destroyed) by ozone.  After oxidation by products does not cause objectionable odor & are safe to dispose in surrounding air.  Crucial part of the solution is to trap the foul odor & efficiently mix with ozone gas to oxidize.
  7. 7. General Arrangement Layout : - Plan view
  8. 8. Implementation :
  9. 9. Safety First :  Most Important : If required Air ozone sensors & monitors are available. Ozone sensors can be interlocked with ozone production & controlled ozone level. System can be pre-set for ozone level
  10. 10. Operation & Maintenance :  Ozonator is fully electrical operated.  Ozonator should be operated 24 x 7  For flawless operation three ozonators are operated alternately. (2 w +1S)  Routine maintenance frequency is once in months  Break-down repair/maintenance will be attained in 48 hrs. (Under this situation, there is a provision of one standby unit)
  11. 11. Consumables & replacements :  Consumables : Electricity Power - 2,000 watts  Electrical consumption : 2.0 kw x 24 hrs = 48 kw-hr = 48 units/day x 10/- (rate per unit) = 480 /- per day  Replacements:  Ozone cell : 2 – 2 ½ yrs : Rs. 20,000/=  Molecular sieves : 1 ½ - 2 yrs : Rs. 15,000/=
  12. 12. STP Odor & Ozone Chemistry :  In an aqueous solution, however, two competing simultaneous reactions occur, one to produce elemental sulfur, and one to produce sulfuric acid: H2S + O3 → S + O2 + H2O 3 H2S + 4 O3 → 3 H2SO4  Ozone also oxidizes nitric oxide to nitrogen dioxide: NO + O3 → NO2 + O2  This reaction is accompanied by chemiluminescence. The NO2 can be further oxidized: NO2 + O3 → NO3 + O2  Ozone does not react with ammonium salts, but it oxidizes ammonia to ammonium nitrate: 2 NH3 + 4 O3 → NH4NO3 + 4 O2 + H2O  Ozone reacts with carbon to form carbon dioxide, even at room temperature: C + 2 O3 → CO2 + 2 O2  Ozone reacts with methane to form carbon dioxide, even at room temperature: 3 CH4 + 4 O3 → 3 CO2 + 6 H2O
  13. 13. Thanks For your Precious time For more Information : Visit : [www.chemtronicsindia.com ; www.ozonegeneratorindia.com] Email: [response@chemtronicsindia.com] Call : Mr. Sunil Shah - +91-9321234527

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