Gaseous Contaminants Threatening Servers of Malad Area
That is exactly what the super modern IT/ITes service offices of 3G Global services, Mind space located in the premium Malad area of Mumbai, were facing. The buildings, in this area are primarily occupied by call centers of financial services, telecom services, etc. i.e. the service industry, operates 24 x 7. Computer systems and servers were breaking down disrupting work and resulting in loss of business. To add to the woes, people working in the offices were extremely uncomfortable leading to loss in productivity.
The Culprit: Built on landfill site, the building had a large open drain carrying untreated waste/sewage water to the back-waters of Arabian Sea running right next to it.
Thus, the whole area was blanketed with an obnoxious, foul odour. The odours were primarily due to the presence of hydrogen sulphide gas in methane, which is continuously generated due to the gradual degradation of organic material in the sewerage and the land fill. (Methane, on its own has no odour and thus, is not considered as a contaminant).
Facts Of The Case
Multi-storied buildings designed to meet current as well as future needs.
Centrally air conditioned with AHUs on every floor.
Chilled water fed AHUs with the supply air being ducted while the return air is free flow.
Each AHU room has a fresh air intake point, provided with a damper, which sucks in outside fresh air due to strong negative draft present in AHU room.
The HVAC designs of almost all the buildings cater for a 10% fresh air intake.
Plagued with this odorous and corrosive problem, many offices in the building had the air analyzed by an independent testing service. The “Corrosion Classification Coupon“ test, conducted showed a corrosion potential @20,000 angstroms on a 30 day schedule, equivalent to 500 ppb clearly indicating GX Air Quality (severe category).
Extracts from the report showing approximate contamination levels of only the corrosive elements:
Maximum Concentration (in PPB)
Oxides of Nitrogen
The above figures, though very authentic, did not indicate the actual levels of the problems as nature plays a big role in adding to the woes.
Wind directions: If the wind direction is towards the building from the contaminant generation zone, then the after effects are quite contrary to the one when it’s been the other way round.
Fluctuation in concentrations in gaseous contaminants: Hydrogen Sulphide emission from the landfill peaks when the temperature and humidity is high and carries on till the land mass is relatively warm. Hence, the ‘rotten egg’ smell starts off by mid afternoon and continues till late evenings. During the summer months, the emissions are significantly higher.
The Solution Odour Removal Through Gas Phase Air Filtration
Having identified the culprit, the building management contacted the Airgineers at Bry-Air.
After studying the problem and space constraints, Bry-Air customized its EcoScrub Gas Phase Filtration System to purify the fresh air coming into the building through the AHUs. 19 EcoScrub units have been installed on the terrace. These units treat 54000 CFM of fresh air. All gaseous contaminants are removed before it enters the AHUs.