Thermacon TIGHTNESS

TIGHTNESS

Large Volumes of low pressure constantly flowing air are required in wastewater treatment plants. Most wastewater systems require an actively ventilated system with a fan or a blower inducing air movement over the process area, conveying the air to a treatment unit for processing. This process requires constant, low pressure negative air pressure. As a result, the source and method of air replacement should be of utmost concern. Typically air is replaced through controlled ventilation points and vacuum relief openings.

An effective active ventilation system must take into account the negative air pressure requirements of the emission source as well as the desired V.O.C. concentration within the system. Insufficient negative pressure may allow fugitive emissions and cause improper air exchanges that may lead to fire and explosion hazards, along with severe corrosion problems. Systems with gaps and cracks prevent the proper control of air flow and velocity which is essential for a successful unit.

Air volume in wastewater treatment applications can be reduced in the following ways.

Reduce the air volume to be treated through a low profile flat cover system
Reduce the leakage rate of system.
Reduce the system configuration to reduce the regulatory driven number of air exchanges

Tightness and proper air movement will reduce capital equipment costs, reduce operational costs and improve overall plant well being.

The attached illustration demonstrates the workings of a flat cover system. The tightness of the system affects equipment size and that in turn reduces operational costs.

Comparison of NON-TIGHT System and COVERTITE

1 - Non-tight system with gaps and un-sealed joints

2 - Fresh air forced in by fans enter the system through gaps between covers

3 - Un-even air exchange may cause for concentration of gas that can lead to emission rather than containment

4 - Oversized ducts needed to handle larger volume of air

5 - Oversized fans needed to handle larger volume of air

6 - Oversized treatment units needed to handle larger volume of air

7 - Un-even air exchange with large concentration of fresh air

8 - Dead air pocket leading to corrosion

Blue - Fresh Air
Red - V.O.C - H.A.P. - Odorous Gas
graph

NON-TIGHT SYSTEM

1 - Covertite flat cover system

2 - Intake vent - controlled ventilation

3 - Reduced duct size to facilitate reduced air volume

4 - Smaller fan sized to facilitate reduced air volume

5 - Reduced scrubbers sized to facilitate reduced air volume

6 - Proper air exchange with minimal amount of fresh air

Blue - Fresh Air
Red - V.O.C - H.A.P. - Odorous Gas
graph

COVERTITE FLAT COVER SYSTEM

Thermacon Containment Systems

Tel: (561) 683 0888 Fax: (561) 683 0880 email: thermacon@aol.com