In the context of increasingly strong industrial development, wastewater treatment has become an urgent requirement to protect the environment and comply with legal regulations. Industrial wastewater treatment system not only helps remove pollutants but also contributes to optimizing operating costs, ensuring the output water meets safety standards. So how to operate this system effectively and sustainably? Let's Green In Learn about advanced methods that help businesses treat wastewater safely, economically and environmentally.
1. What types of industrial wastewater are there?
Industrial wastewater is generated from production and processing activities in many different fields. Based on its composition and properties, industrial wastewater can be divided into two main groups:
Inorganic industrial wastewater
This type of wastewater mainly comes from the metallurgical, mining, steel and coal industries. The typical composition of inorganic wastewater includes suspended solids, heavy metals, acids, alkalis and some toxic compounds such as cyanide or fluoride. Inorganic wastewater treatment often uses sedimentation, chemical precipitation or pH neutralization methods.
Organic industrial wastewater
Generated from food processing, chemical, textile and pharmaceutical industries. This type of wastewater contains many biodegradable organic compounds, which can cause serious pollution if not treated properly. Common treatment methods include biological treatment with microorganisms or combined with other physicochemical technologies.
2. What is a wastewater treatment system? What is its function?
Industrial wastewater treatment systems play an important role in controlling environmental pollution, helping businesses comply with legal regulations on water resource protection. An effective treatment system needs to meet the following criteria:
- Removes impurities, heavy metals, harmful organic and inorganic compounds in wastewater.
- Ensure that treated water meets environmental standards as prescribed by the Ministry of Natural Resources and Environment.
- Reasonable investment cost, stable operation and easy maintenance.
- Easy to upgrade and expand when wastewater treatment needs increase.
3. Regulations that industrial wastewater treatment systems must comply with
The system can use physical, chemical and biological methods to remove pollutants. Some regulations that need to be followed in industrial wastewater treatment:
- If the factory is located in an industrial park with a centralized wastewater treatment system, the enterprise does not need to apply for a separate discharge license.
- If the industrial park does not have a common wastewater collection and treatment system, the factory must apply for a discharge permit according to local regulations.
4. Types of industrial wastewater treatment technologies currently applied
The choice of industrial wastewater treatment technology depends on the nature of the wastewater, the level of pollution and the output treatment requirements. Below are some common industrial wastewater treatment technologies today:
AO (Anaerobic – Oxic) biological wastewater treatment technology
This technology is based on the denitrification process in wastewater, combining two anoxic and aerobic treatment zones to remove organic matter and nitrogen compounds. AO technology has the advantages of low cost, easy operation and high treatment efficiency.
AO technology is a method of wastewater treatment using microorganisms, including two main stages:
- Anaerobic zone: Anaerobic microorganisms decompose organic matter and reduce nitrate to N₂ gas.
- Aerobic zone: Aerobic microorganisms continue to decompose the remaining organic matter, while converting ammonium into nitrate.
Physicochemical wastewater treatment technology
Applying coagulation, flocculation and sedimentation methods to remove heavy metals, organic substances that are difficult to decompose and color in wastewater. Commonly used chemicals include PAC (aluminium sulfate) and Polymer to increase sedimentation efficiency.
Physicochemical technology uses chemical reactions and physical processes to remove pollutants in wastewater. The main processes include:
- Coagulation – flocculation: Use chemicals such as PAC (alum) to bond small sediment particles into large sludge flocs that easily settle.
- Grease separation: Use flotation tanks to remove oil and grease from industrial wastewater.
- Ion exchange: Use ion exchange resin to remove heavy metals and toxic ions.
Wastewater treatment technology using MBR (Membrane Bioreactor)
This system uses mobile media for microorganisms to grow, helping to improve the ability to decompose organic matter. Compared with traditional activated sludge technology, MBBR has the advantages of saving space, high treatment efficiency and easy scale expansion.
MBR (Membrane Bioreactor) wastewater treatment technology
It is a combination of biological treatment and hollow fiber membrane filtration, which helps remove bacteria, suspended solids and organic substances in wastewater. This technology can achieve high treatment efficiency, ensuring that the treated water meets strict discharge standards.
Application: Applied in medical, pharmaceutical, food and industrial wastewater treatment with high output water requirements.
SBR/ASBR Technology (Sequencing Batch Reactor / Advanced SBR)
This is a batch treatment system with high efficiency in removing nitrogen and phosphorus. The system has simple structure, easy operation and can flexibly adjust the load according to actual needs.
5. Conclusion
Industrial wastewater treatment system not only helps protect the environment but also plays an important role in ensuring sustainable production. Choosing the right technology will help businesses optimize costs, comply with regulations and minimize negative impacts on the ecosystem. Follow now Green In for more useful information!