Technology diagram for treating wastewater in a manufacturing plant

Industrial Wastewater Treatment

Wastewater in factories can be divided into two main types: domestic wastewater and wastewater generated from production activities. Classifying wastewater helps us easily establish a suitable wastewater treatment system for factories according to each type.

Domestic wastewater from workers in factories

From washing and bathing areas: this type of wastewater contains minor pollutants, so it does not require preliminary treatment and can be directly sent to the treatment system at the back.

Toilets: waste from toilets, urine, suspended solids, and harmful microorganisms. Before being transferred to the domestic wastewater treatment system, it needs to be digested in a septic tank for a period of time.

Kitchen wastewater: water from the kitchen contains a high amount of grease. This grease needs to be preliminarily treated by separating it before entering the equipment; otherwise, the grease will affect subsequent water filtration processes.

Production activities in factories

Wastewater generated from production processes such as raw material processing, equipment washing, from cooling systems, boilers, etc. After being discharged from these processes, the water no longer meets hygiene standards and clean water standards.

Methods of treating wastewater in factories

The wastewater treatment process for factories is summarized as follows:

Bar screen

The incoming wastewater will pass through a bar screen to remove large waste materials and be directed to a collection tank in a sump.

Collection tank

The tank is equipped with a water flow meter and pumps. The tank collects wastewater from the factory and pumps the wastewater in the collection tank through the system. During this stage, the settling process also occurs to remove solid waste.

Fine screen filtration

The wastewater pumped from the collection tank will pass through a fine screen filter before entering the main treatment system. Here, small waste materials with a size of 0.075mm or larger will be retained, while the remaining water will be sent to the grease trap tank.

Grease trap tank

The grease trap tank will separate and filter the grease remaining in the water to ensure it does not affect the subsequent biological treatment process. After treatment, the wastewater will flow through a regulating tank.

Regulating tank

The regulating tank receives and regulates the concentration and flow of wastewater to create a stable water flow. It then moves to the SBR tank.

SBR tank

The SBR tank operates continuously in a closed cycle consisting of 5 stages: water supply - water filling - air aeration - settling and water extraction. This closed process takes about six hours. Afterward, the water continues to be directed to the disinfection tank.

Disinfection tank

Although the water has been treated after passing through the filtration tanks, it still contains many bacteria. Most of these bacteria do not affect human health, but some can produce disease-causing pathogens. Therefore, the water needs to be disinfected by mixing with lime chlorine before being discharged into the environment.

Pressure sand filter tank

At this stage, any remaining suspended solids or small organic matter will be thoroughly treated.

Sludge holding tank

The sludge generated from mechanical, biological, and chemical treatment processes will be collected and directed to the sludge holding tank. At this stage, the tank will separate the sludge from the water, with the sludge being periodically collected and treated, while the water will continue to be recycled for further treatment until it meets the standards before being discharged into the environment.

Considerations when installing a wastewater treatment system in factories

According to current legal regulations, all factories must build treatment systems that meet standards before starting operations. Although the initial costs for construction are high, this is essential. Pure water is the source of safe water for health and ensures that production processes run safely.

Wastewater treatment systems in factories operate by combining multiple technologies as outlined above to achieve high water treatment efficiency, capable of producing water that meets technical standards. Moreover, during operation, they can adjust power autonomously, helping to save costs in the long run.

A well-designed and properly implemented system will ensure the aesthetic appearance of the factory, save cleaning costs, and make upgrading and maintenance processes more convenient in the future.

Reputable unit for installing wastewater treatment systems in factories

However, before constructing a system for a factory, investors need to find a reputable and cost-effective construction unit.

With over 20 years of experience, Toan A has been involved in designing, installing, operating, evaluating performance until stable operation of wastewater treatment systems for many factories nationwide. Some prominent projects include:

• MCNEX Vina Co., Ltd., Ninh Binh.
• Dong Anh Construction and Steel Structure Co., Ltd., Hanoi.
• ...

Therefore, if you need to install wastewater treatment system construction for a factory, contact us now at 0913.543.469. Toan A is honored to provide you with the best service.