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

1. STP Odor
Destruction
By
ozone oxidation
The Capital (Wadhwa Group)– BKC (mumbai)
Case Study

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. 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. 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. 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. 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. General Arrangement Layout : - Plan view

8. Implementation :

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. 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. 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. 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. 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