What is wastewater treatment?

1. What is wastewater treatment?
Wastewater treatment is a process to remove contaminants and pollutants from wastewater (domestic wastewater, industrial wastewater, hospital wastewater …) in order to protect the environment and reuse it. Use treated wastewater. Wastewater treatment can use many different methods such as physical, chemical, biological – Depending on the type of wastewater, the application of appropriate technology to achieve the highest efficiency.

2. The most optimal wastewater treatment process today
The construction of wastewater treatment systems before being released to the environment is essential for any agency, business or individual. The treatment of wastewater includes many stages such as chemistry, physics, and biology.

These processes have the effect of promoting the improvement of water quality, helping to minimize the toxic content released into the environment so that it can be reused and does not cause pollution. Here are some stages of the most popular wastewater treatment systems today

Throttle and neutral
Flocculation, flocculation and precipitation
Aerobic biological treatment
Treatment level 3 (Filter, adsorption, ion exchange)
The posts see a lot

The most efficient and economical industrial wastewater treatment system
Summary of commonly used wastewater treatment chemicals
Wastewater treatment system for industrial zones

Waste water treatment system before being released to the environment

3. The most optimal wastewater treatment system today
To achieve the highest efficiency, the most cost-effective in the process of wastewater treatment, in this article, Greenwater will provide you with wastewater treatment systems, from which you can apply to the business. so that its highest efficiency.

3.1. Waste water treatment with a throttle system
Circulation is the process of reducing or controlling changes in the characteristics of wastewater in order to create optimum conditions for subsequent treatment processes. The process of circulation is conducted by storing waste water in a large tank, then pumping them quantitatively into the next treatment tanks.

Image Regulating system of wastewater treatment tanks in industry

The throttle process is used to:

Adjust the variation in the flow of waste water by the hour of the day.

Avoid fluctuations in the amount of organic matter affecting the activity of bacteria in biological treatment tanks.

Controlling the pH of wastewater to create optimal conditions for later biological and chemical processes.

The capacity of the regulating tank also contributes to minimize the impact on the environment because the discharge flow is maintained at a stable level.

In addition, the circulating tank is also the place where the toxins are fixed for biological treatment process, making the performance of this process better.

3.2. Waste water treatment by neutralization system
Wastewater often has a pH that is not suitable for biological treatment or to the environment. Therefore, it needs to be neutralized. There are many ways to proceed with the neutralization process:

– Mixing waste water with acid pH and wastewater having basic pH. By mixing two different types of wastewater with different pH, we can achieve the purpose of neutralization. This process requires a regulating tank large enough to hold wastewater.

– Neutralize Acid Sewage: people usually let acid sewage run through a limestone layer to neutralize; or put lime solution in sewage, then lime is separated by sedimentation process.

– Neutralize alkaline waste water: by strong acids (paying attention to the economy). CO2 can also be used to neutralize alkaline waste water, when CO2 is discharged into the wastewater, it forms carbonic acid and neutralizes with wastewater.

Picture of yourself – Waste water treatment by neutralization tank

3.3. Waste water treatment by flocculation technology and creating flocculation
These two chemical processes combine suspended solids and colloidal particles to form larger particles. The wastewater contains colloidal particles that have a positive charge (usually a negative charge).

It is its charge that prevents it from colliding and coalescing, making the solution stable. The addition of certain chemicals (alum, ferrous chloride, etc.) to the wastewater causes the solution to become unstable and increases the combination of particles to form residues that are large enough to be removed by the process. filter or sediment.

The most commonly used flocculants are iron or aluminum salts with valence 3.
The most commonly used scale flocculants are organic polymers such as polyacrilamide. The combination of using high-molecular organic substances with inorganic salts greatly improves the ability to create scale.

3.4. Waste water treatment by precipitation system
Precipitation is the most common method of removing heavy metals from wastewater. Usually heavy metals are precipitated as hydroxide. Therefore, to complete this process, it is common to add bases to sewage so that the wastewater reaches the pH that heavy metals need to remove with the lowest solubility.

Usually before the precipitation process, one needs to remove other pollutants that are likely to hinder the precipitation process. The precipitation process is also used to reduce phosphate in wastewater.


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