Composite tanks for wastewater treatment: Principles and applications

What is a composite wastewater treatment tank?

A composite wastewater treatment tank is a device used to remove pollutants, bacteria, impurities in domestic wastewater, hospitals, schools, manufacturing plants, etc. The treated water is safe and can be discharged into receiving sources without causing pollution.

The composite wastewater treatment tank is considered one of the solutions that help investors optimize operational efficiency and costs. The equipment has the ability to treat wastewater well, with low investment or usage costs. Additionally, the construction time is quick, saving construction space.

Structure of composite tanks

Composite tanks are made from FRP plastic and coated with a layer of composite on the outside. Therefore, the equipment has a long lifespan, can resist corrosion from acids or solvents.

Composite tanks are considered reliable, ensuring quality during operation. Therefore, investors can use them with peace of mind.

The tank structure is made from imported fiberglass. Therefore, the equipment has a high lifespan, excellent impact and corrosion resistance.

Types of composite wastewater treatment tanks

Composite tanks are made from materials similar to other types of fish tanks, acid tanks, etc. However, to be suitable for their intended use, some additional accessories need to be equipped such as center pipes, sawtooth troughs to match the installation location and enhance efficiency.

In reality, there are many different types of composite wastewater treatment tanks in terms of area, shape to suit various purposes. Specifically:

• Round column treatment tanks.
• Composite wastewater treatment tanks with 4 square compartments.
• Center-type composite treatment tanks.
• Cone-shaped tanks.
• Ion exchange tanks.
• Sedimentation tanks.

Advantages and disadvantages of composite wastewater treatment tanks

Advantages

• Simple design, easy to use, saves installation and operation time.
• High durability, excellent corrosion, heat, and pressure resistance.
• Suitable for various types of wastewater sources.
• Minimize the risk of leakage.
• Modern design, high aesthetic value.
• Relatively low cost, less prone to malfunctions or damage during use.
• Suitable for all installation terrains.

Disadvantages

• Composite plastic material cannot be recycled.
• Although the durability is considered good, it is still not comparable to tanks made of iron or steel.

Principle of composite wastewater treatment tanks

Aeration tank

This tank functions to remove nitrogen and some organic matter in wastewater. The tank is equipped with an air distribution system at the bottom of the tank. This helps to reduce the risk of biological sludge settling, thereby increasing the uniformity of wastewater.

Anoxic tank

The anoxic tank uses microbial carriers to increase the activity density of sludge. This creates a favorable environment for anaerobic microorganisms to grow and develop rapidly. As a result, the efficiency of organic matter treatment is significantly improved.

The operation of the anoxic tank depends on the air distribution system installed at the bottom of the tank. Therefore, organic matter, nutrients in the water under the influence of microorganisms will be converted into water and CO2 gas.

Sedimentation tank

The sedimentation tank separates the sludge and sediment generated from the anoxic tank from the treated water. Here, the sludge will be circulated to the anoxic tank to help remove nitrogen gas in the wastewater.

In addition, the sedimentation tank also processes excess sludge out of the tank. This helps maintain activity in the tank.

Disinfection tank

In this tank, a certain amount of chemical is added to the wastewater according to the permitted concentration. This helps to kill all bacteria, parasites, and pathogens in the wastewater.

Sludge storage tank

In addition to the above 4 compartments, there is another sludge storage tank that stores excess sludge. When it reaches a certain level, it will be collected and treated separately.

Applications of composite tanks in wastewater treatment

• Wastewater treatment at hotels, resorts.
• Wastewater treatment at restaurants, eateries.
• Domestic wastewater treatment for apartment buildings, households in cities, towns.
• Wastewater treatment for schools, hospitals.
• Wastewater treatment for medium and small-scale industrial facilities.

The above is the sharing of experts from Toan A JSC about composite wastewater treatment tanks. Hopefully, it has helped you understand the basic information about this equipment and choose the most suitable solution for the characteristics of the wastewater source. If you need to build and design composite wastewater treatment tanks, please call the hotline 0913.543.469 for immediate advice.