Product Overview

The FRP wastewater tank cover system is designed for the sealed covering of equalization tanks, hydrolysis tanks, sludge tanks and other wastewater treatment structures.

The system commonly adopts an FRP grating and structural frame combined with reinforced flat FRP cover panels. It isolates odorous gases from the surrounding environment, provides convenient access for inspection and maintenance, and supports the collection of exhaust gas for subsequent odor treatment.

FRP cover panels are suitable for corrosive, humid and outdoor wastewater treatment environments. They provide excellent corrosion resistance, weather resistance, flame-retardant performance, UV resistance and long service life.

The cover dimensions, color, structural configuration, access openings and exhaust gas collection interfaces can be customized according to the tank structure, site conditions and project requirements.

Typical Applications

• Wastewater equalization tanks
• Hydrolysis and acidification tanks
• Sludge storage tanks
• Sedimentation tanks
• Biological treatment tanks
• Industrial wastewater treatment facilities
• Municipal sewage treatment plants
• Odor collection and exhaust gas treatment systems

FRP Cover Structural Design Requirements

Load Item	Design Requirement	Unit
Service Load of Flat FRP Cover Panel	≥2.0	kN/m²
Construction and Maintenance Load per Cover Panel	≥5	kN
Negative Pressure from Odor Extraction	-0.1	kN/m²

Note: The cover structure should also be checked according to actual project conditions for localized concentrated loads generated by equipment, transportation tools, stored materials and maintenance activities.

FRP Cover Technical Requirements

• Suitable for installation in highly corrosive wastewater treatment environments.
• Recommended operating temperature range from approximately -50°C to 90°C.
• Provides flame-retardant, fire-resistant, UV-resistant and weather-resistant performance.
• The filler content of the synthetic resin should comply with the relevant technical specifications and project requirements.
• The color of the FRP cover can be selected to coordinate with the surrounding buildings and structures.
• The cover color can also be customized according to the owner’s requirements.
• The structure is designed for a normal service life of more than 10 years under suitable operating and maintenance conditions.
• Steel components that are directly exposed to wastewater or corrosive odor should be manufactured from stainless steel.
• The structure, fabrication, installation and protective measures should fully consider odor, wastewater, corrosion, humidity and outdoor exposure.

Reinforced Flat FRP Cover Panels

The system can use reinforced flat FRP cover panels with an anti-slip surface. The panels may be reinforced with integral FRP ribs or externally wrapped carbon-steel stiffeners according to the required span and load.

After installation, the upper surface of the FRP cover panel can be aligned with the concrete slab or the top surface of the tank wall to provide a level and accessible operating surface.

Typical Panel Requirements

Item	Typical Requirement
Upper FRP Flat Plate Thickness	Not less than 3 mm
Surface Type	Anti-slip patterned surface
Pattern Projection Height	Not less than 2 mm
Recommended Panel Width	Not more than 1.5 m
Reinforcement Method	FRP reinforcing ribs or externally reinforced carbon-steel stiffeners
Installation Level	Flush with the concrete slab or tank-wall top where required

Key Advantages of the FRP Cover System

• Excellent resistance to wastewater, moisture and corrosive gases
• Lightweight structure with high mechanical strength
• Convenient modular installation and removal
• Anti-slip surface improves maintenance safety
• Suitable for odor collection under negative pressure
• Low maintenance requirements
• Long service life in wastewater treatment environments
• Customizable dimensions, colors and access openings
• Can be integrated with odor extraction ducts and treatment equipment

Steel-Framed Inverted-Suspension Fluorocarbon Membrane Sealing System

For large-span wastewater tanks, an inverted-suspension fluorocarbon fiber membrane sealing system can also be adopted.

This structure uses a highly corrosion-resistant fluorocarbon fiber membrane to enclose the odorous gas. The supporting steel frame is positioned outside the sealed enclosure and does not directly contact the corrosive gas.

This design fully utilizes the corrosion resistance of the membrane while reducing corrosion risk for the steel structure. Because the steel frame remains outside the corrosive environment, it can be designed according to conventional building structural standards.

The system combines a relatively small supporting framework with a lightweight, high-strength membrane, making it suitable for large-span wastewater tanks and odor-control enclosures.

Structural Advantages of the Membrane System

Innovative Structural Design

The inverted-suspension membrane structure is developed from conventional cap-type membrane structures. A corrosion-resistant membrane forms the sealed enclosure, while the steel framework is arranged outside the contaminated gas zone.

This arrangement minimizes the amount of steel required inside the enclosure and fundamentally reduces direct contact between structural steel and corrosive wastewater gases.

Lightweight and High Strength

The membrane normally has a very low self-weight, typically around 1 kg/m², making it suitable for large-span tanks such as sedimentation tanks.

Although lightweight, the membrane material provides high tensile strength. A membrane with a thickness of approximately 0.80 mm can provide substantial tensile performance while maintaining flexibility.

Its relatively low elastic modulus allows it to form smooth curved surfaces and cover large spans without requiring numerous intermediate supports.

Structural Load Performance

Load Type	Design Consideration
Self-Weight	The lightweight membrane minimizes permanent structural loading, making it suitable for large-span wastewater tanks.
Wind Load	The curved and enclosed membrane surface helps guide wind across the structure and reduces wind-pressure concentration. The final design should comply with the applicable local structural load code.
Snow Load	The high-center, low-edge profile forms a relatively steep slope, while the smooth membrane surface helps reduce snow accumulation.
Seismic Load	The lightweight and flexible structural system has a relatively long natural vibration period, helping reduce seismic forces.

Wind Resistance

The covered tank is commonly designed with a conical or curved profile. Because the structure is fully enclosed for odor collection, wind can flow smoothly across the membrane surface.

The aerodynamic shape reduces the influence of wind loads on the structure. The final wind-load parameters, connection details and anchoring system should be determined according to the local wind zone and applicable building standards.

Snow Load Resistance

The fluorocarbon membrane structure is a tensioned structural system. The cap-type design forms a profile that is higher in the center and lower around the perimeter, creating a sufficient slope for snow shedding.

The smooth membrane surface also makes snow accumulation more difficult. The snow-load coefficient should be selected according to the local structural load standard and the actual height difference and roof geometry.

Seismic Performance

Because the membrane is lightweight and the structure is flexible, the seismic mass is relatively small. This helps reduce the seismic force transmitted to the supporting framework and foundation.

Architectural Appearance

Flexible Shapes

The steel-framed inverted-suspension membrane structure can be designed in different forms according to the tank dimensions, site layout and surrounding buildings.

Its flexible geometry allows the enclosure to coordinate with the surrounding industrial environment while maintaining the functional requirements of odor collection.

Light Transmission

The fluorocarbon fiber membrane can provide a light transmittance of approximately 6%, allowing natural light to enter the enclosure during daytime operation.

This improves internal brightness and can support equipment inspection and maintenance. At night, internal lighting can create a distinctive architectural appearance through the membrane surface.

Self-Cleaning Surface

The membrane surface treatment provides good self-cleaning performance, helping reduce dust accumulation and simplify maintenance.

Its resistance to surface contamination is generally higher than that of many conventional enclosure materials, helping the structure maintain a clean appearance.

Modern Industrial Appearance

The steel framework provides a strong industrial appearance, while the curved membrane creates a lightweight and elegant visual effect.

The combination of rigid steel and flexible membrane can create a distinctive landmark structure within a wastewater treatment facility or industrial plant.

Manufacturing and Installation

Factory Fabrication

The steel framework and membrane components are fabricated under controlled factory conditions, helping ensure dimensional accuracy and consistent manufacturing quality.

Fast On-Site Installation

After fabrication, the steel components and membrane are transported to the project site for assembly.

The modular structure requires limited on-site working space and can significantly reduce installation time. For renovation projects involving existing wastewater tanks, the system can be assembled or lifted into position with minimal impact on tank operation.

Convenient Inspection and Maintenance

Maintenance doors, access openings and inspection passages can be reserved along the perimeter membrane according to the equipment layout.

These access points allow regular inspection and maintenance without interfering with the normal operation of the wastewater treatment tank.

Membrane Material

The system uses high-quality fluorocarbon fiber membrane selected according to the corrosive gas composition, span, structural load, fire-performance requirements and outdoor environmental conditions.

Comparison of Available Cover Systems

Cover Type	Main Characteristics	Typical Applications
Flat FRP Cover System	Modular, corrosion-resistant, anti-slip, removable and suitable for maintenance access	Equalization tanks, hydrolysis tanks, sludge tanks and small- to medium-span tanks
FRP Grating and Frame Cover	Lightweight structural support combined with reinforced FRP panels	Wastewater tanks requiring modular installation and localized maintenance access
Inverted-Suspension Fluorocarbon Membrane	Lightweight, large-span, corrosion-resistant and visually distinctive	Large sedimentation tanks, biological tanks and large odor-control enclosures

Odor Collection Integration

The sealed cover system can be connected to an odor extraction network through reserved air outlets and duct interfaces.

The collected odorous gas can then be transported to suitable treatment equipment such as:

• Biological deodorization systems
• Activated carbon adsorption units
• Acid and alkaline scrubbers
• Chemical spray scrubbers
• UV photolysis or oxidation systems
• Combined industrial odor treatment systems

Selection Considerations

• Tank dimensions and structural span
• Existing concrete tank-wall condition
• Required service and maintenance loads
• Negative pressure inside the enclosure
• Odorous gas composition and corrosion level
• Outdoor temperature, UV exposure and weather conditions
• Wind, snow and seismic design requirements
• Maintenance doors and equipment access requirements
• Exhaust gas collection volume and duct interfaces
• Required cover color and architectural appearance

Frequently Asked Questions

What is an FRP wastewater tank cover?

An FRP wastewater tank cover is a corrosion-resistant enclosure installed over wastewater treatment tanks to isolate odors, improve safety and support exhaust gas collection.

Where can the FRP cover system be used?

It can be used for equalization tanks, hydrolysis tanks, sludge tanks, sedimentation tanks and other municipal or industrial wastewater treatment structures.

Can maintenance personnel walk on the cover?

Reinforced panels can be designed for maintenance access according to the specified service and concentrated loads. The final load capacity must be verified for each project.

Can the cover withstand negative pressure?

Yes. The cover structure can be designed for the negative pressure generated by the odor extraction system.

What is the recommended operating temperature?

The FRP cover is generally suitable for working environments from approximately -50°C to 90°C, subject to the selected resin and structural configuration.

What is the difference between an FRP cover and a membrane cover?

An FRP cover is generally modular, rigid and suitable for direct maintenance access. A membrane cover is lightweight and more suitable for large-span tanks requiring fewer intermediate supports.

Can the color and dimensions be customized?

Yes. The color, dimensions, panel arrangement, maintenance openings and duct interfaces can be customized according to project requirements.

Can ES Air design the complete odor-control system?

Yes. ES Air can provide tank covering, odor collection ductwork and suitable exhaust gas treatment equipment according to the tank dimensions, gas volume and odor composition.

Customized Wastewater Tank Cover and Odor Collection Solutions

ES Air provides FRP wastewater tank covers, steel-framed membrane enclosures and integrated odor collection systems for municipal and industrial wastewater treatment applications.

Contact ES Air for tank measurement, structural evaluation, material selection, odor extraction design and customized sealing solutions.

Brief: The ES Air FRP Wastewater Tank Cover and Odor Sealing System is designed for equalization tanks, hydrolysis tanks, sludge tanks and other wastewater treatment structures. Available as reinforced flat FRP panels, grating-supported covers or steel-framed inverted-suspension fluorocarbon membrane systems, it provides corrosion resistance, odor containment, maintenance access and integration with industrial deodorization equipment.