Stormwater Drainage and Stormwater Treatment Systems (Turnkey Solutions)

Stormwater treatment systems are designed to treat surface runoff collected from industrial sites, roads, warehouses, fuel stations, residential areas, and production facilities.

Stormwater runoff is not simply rainwater.
It is a flow that washes off surfaces and carries:

• sand and mineral particles
• petroleum products
• suspended solids
• organic contaminants
• dissolved impurities

If untreated, this runoff enters water bodies, storm sewer networks, or soil already contaminated.

Stormwater treatment systems provide comprehensive preparation of surface runoff to meet regulatory discharge standards before release.

Stormwater treatment is implemented in sequential stages.

Stage 1 – Grit Removal

At the first stage, the flow enters a grit separator.

Through properly designed hydraulics and gravitational forces, the following are settled:

• coarse particles
• fine mineral impurities
• sand

Sediment accumulates at the bottom of the chamber.

The grit separator is equipped with a sludge level sensor indicating the need for maintenance.
Sediment removal is performed by vacuum truck or portable pump.

This stage protects downstream equipment from abrasive wear.

Stage 2 – Oil Separator

After mechanical solids removal, the flow enters an oil separator equipped with a coalescing module.

The system operates based on density differences between water and petroleum products.

Coalescing elements promote aggregation of fine oil droplets, allowing them to rise to the surface.

The oil separator is fitted with an oil layer sensor that monitors film thickness and prevents overflow.

This stage is critical for transport-intensive and industrial sites.

Stage 3 – Sorption Polishing

Following bulk oil removal, the flow passes through a sorption unit.

The sorbent:

• captures residual hydrocarbons
• retains fine suspended solids
• stabilizes oil concentration parameters

This allows the treated water to meet discharge regulations.

Stage 4 – Disinfection (Optional)

If required, treated surface runoff undergoes a disinfection stage.

This is particularly relevant when discharging into natural water bodies or when reuse is planned.

DESIGN CONFIGURATIONS

Stormwater treatment systems are manufactured in two configurations:

Underground Design

Consists of a fully factory-assembled block of cylindrical tanks made from composite polymer materials.

Equipped with:

• shut-off and control valves
• monitoring systems
• level and sludge sensors

This configuration is used where land area is limited and sanitary setback requirements must be met.

Above-Ground Design

Manufactured as fully assembled prismatic steel tanks.

Used at industrial facilities where visual inspection and ease of maintenance are important.

• Autonomous Operation

The system functions without permanent on-site personnel.

• Factory-Assembled Delivery

Minimal construction work required on site.

• High Chemical and Corrosion Resistance

Materials are designed for operation in aggressive environments.

• Reduced Capital Costs

Compact design minimizes construction expenses.

• Service Life – Not Less Than 50 Years

When operated within design parameters.

• Seismic Resistance

Suitable for regions with increased seismic activity.