To avoid complaints from residents living near water and wastewater plants, facility
owners must install systems that control odours and prevent toxic gas releases.
Owners also need to remove corrosive gases from their applications to ensure proper
functioning of computer-driven process controls.
Established in 1987 to meet these needs, Purafil Environmental Systems Division
(ESD) specialises in three main areas:
- Odour control to eliminate foul-smelling gases from sewage collection and processing
operations
- Emergency gas control to prevent accidental chemical releases at facilities storing
hazardous quantities of chlorine or sulphur dioxide
- Corrosion control to protect electronic equipment from premature failure.
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Emergency Gas Scrubber Applications
Bulk storage of hazardous gases such as chlorine and sulphur dioxide is commonplace
throughout industry and in the water and wastewater industry. It is imperative
that appropriate safety measures are installed at bulk storage sites and the usual
approach taken is for the bulk storage to be located in a room which can be sealed
if a leak is detected by leak detectors. A fan system located outside the building
can then be put into operation in order to create a negative pressure in the bulk
storage room. This negative pressure prevents any gas migrating outside the room,
except for the gas that is extracted by the fan system. The fan system passes
the exhausted gas / air mixture through a scrubber which extracts the gas from
the gas / air flow and exhausts clean air to the atmosphere. The two choices of
Emergency Gas Scrubber are wet or dry scrubber. Dry scrubbers are the better solution
because of simpler installation, more reliable operation, virtually no maintenance
costs, lower lifetime cost, avoidance of handling hazardous wet scrubber chemicals,
easy scrubbing media disposal, lower emission level to atmosphere etc.
Where appropriate, some companies have opted to generate gases on site to avoid
bulk storage but this can be more expensive and a number of accidents caused by
handling the chemicals involved have been reported.
Emergency gas scrubbing of other gases such as phosphene and ammonia is available
from Purafil.
Prisma Services has also developed a range of Mini Scrubbers which are designed
to eliminate small amounts of hazardous gases which are automatically vented by
vacuum dosing regulator valves etc. If these gases are not eliminated, false leak
alarms occur when the gas is detected by leak detection instruments or by operators
in the area.
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