Our Services

Plating Wastewater Treatment System

What is plating wastewater?

Plating wastewater is the type of wastewater generated from manufacturing and processing in the plating industry. The plating industry often uses chemicals and electrochemical processes to create a protective coating on the surface of materials such as metals. However, in the process, chemical substances and other contaminants can be released and dissolved into water, forming plating wastewater.

Harmful ingredients in plating wastewater

Plating wastewater contains many contaminants, including heavy metals such as lead, mercury, zinc, organic compounds, toxic substances such as chlorine compounds, cyanide, and other additives such as colorants, odors, foaming agents. These contaminants can be harmful to the environment and human health if not properly disposed of before being released into the environment.

The methods of treatment of plating wastewater:

There are many methods of wastewater treatment such as
  • Physical processing (such as filtration, precipitation),
  • Chemical treatment (such as chemical treatment),
  • biological treatment (such as using microorganisms or plants for treatment),
  • Combined processing (combining the above methods).

Applicable technology in electroplating wastewater treatment:

Plating wastewater treatment technology can apply methods such as
  • Membrane processing technology,
  • UV treatment technology,
  • Microbiological treatment technology,
  • Treatment technology by redox process,
  • Biofiltration treatment technology.

What is the plating wastewater treatment system:

A plating wastewater treatment system consists of steps and processes such as
Wastewater storage tank, physical treatment tank, chemical treatment tank, biological treatment tank and sedimentation tank. Different components will be used depending on the size and requirements of the system.
Hệ thống xử lý nước thải xi mạ Bắc Ninh Bắc Giang

The process of wastewater treatment usually consists of the following steps:

  1. Pre-treatment: This step aims to remove large suspended solids, grease and other organic matter from the plating wastewater before they enter the main treatment process. Pre-treatment methods may include the use of storage tanks, filtration systems, sand triangulation systems, chemical treatment systems, grease separation systems, and other methods.
  2. Main processing process: a. Physical-chemical process: This step usually uses methods such as precipitation, flocculation, deposition, heavy metal removal and chemical treatment to remove contaminants in wastewater. b. Biological process: This step uses microorganisms to decompose and remove organic matter in wastewater. Biological methods include aerobic sludge treatment, excited sludge treatment system (MBBR), activated sludge treatment system (AS), and dispersed sludge treatment system (SBR).
  3. Precipitation and Deposition Storage Tank: After the main treatment process, the wastewater is transferred into storage tanks to allow the precipitators to react and deposition. This process helps to separate suspended solids and sludge from the wastewater.
  4. Sludge treatment: Sludge is formed from the main treatment process and precipitation and deposition tanks need to be treated separately. Sludge treatment methods include deposition, aerobic sludge treatment, engineering sludge treatment (dewatering), and biological sludge treatment (aerobic or anaerobic digestion).
  5. Disinfection: Finally, wastewater after treatment steps should be disinfected to remove bacteria, viruses, and pathogens. Commonly used disinfection methods are chemical disinfection (e.g., using chlorine, ozone) or ultraviolet light disinfection.

Advantages and limitations of plating wastewater treatment system:

The advantages of electroplating wastewater treatment systems include minimizing environmental pollution, protecting clean water sources, and complying with environmental laws and regulations.
However, the system also has drawbacks such as requiring high initial investment costs, complicated operation and maintenance, and requiring large land areas.

Typical plating wastewater treatment systems:

There are many types of typical plating wastewater treatment systems used in practice, including:
  • Activated Sludge System: This is a biological treatment system in which microorganisms are used to break down contaminants in wastewater.
  • Membrane Bioreactor System: It combines a biological process with the use of a membrane to remove contaminants and bacteria from wastewater.
  • Advanced Oxidation Processes: Use methods such as ultraviolet light, ozone or free hydroxyl to break down the contaminants in the wastewater.
  • Constructed Wetland Systems: Use plants and microorganisms in the filter pools to remove the contaminants in the wastewater.

FAQ about plating wastewater treatment systems

Why do you need plating wastewater treatment?
  1. Plating wastewater contains pollutants that are harmful to the environment and human health. The treatment of plating wastewater eliminates or minimizes pollutants before discharge into the environment, ensuring compliance with environmental laws and regulations.
What are the rights and responsibilities of enterprises in the treatment of wastewater?
  1. Enterprises are responsible for building and operating plating wastewater treatment systems to ensure compliance with environmental laws and regulations. In addition, enterprises also need to ensure that the treatment system is maintained and operates effectively, reporting periodically on wastewater quality and complying with regulatory standards.
What standards apply to plating wastewater in Vietnam?
In Vietnam, the standards applicable to plating wastewater are regulated by the following legal documents:
National Technical Regulation on Environment (QCVN): QCVN 40: 2011 / BTNMT on industrial wastewater quality standards.
  1. QCVN 40: 2011 / BTNMT regulates quality limits for plating wastewater quality parameters such as pH, content of heavy metals, organic compounds, toxic substances, and other indicators.
What is the plating wastewater index according to Vietnamese standards?
The electroplating wastewater index is evaluated based on industrial wastewater quality parameters and must comply with the relevant National Technical Regulations on the Environment (QCVN).
  1. pH: The limit is usually between 6-9.
  2. Heavy metals: Heavy metals such as cadmium, mercury, lead, zinc, nickel, chrome, and copper have separate limits for each metal, which are generally regulated by QCVN 40: 2011 / BTNMT.
  3. BOD (Biological Oxygen Demand): The limit is usually less than 100 mg / L.
  4. COD (Chemical Oxygen Demand): Limit is usually less than 250 mg / L.
  5. TSS (Total Suspended Solids): Limit is usually less than 150 mg / L.
  6. Toxic Substances: Toxic substances such as dyes, organic compounds, and other toxic substances have separate limits, usually regulated by QCVN 40: 2011 / BTNMT.

Conclusion on plating wastewater treatment system:

Plating wastewater treatment system plays an important role in protecting the environment and water resources. Plating wastewater treatment methods and technologies can help reduce pollution and ensure the safety of wastewater sources. However, the implementation of the system requires investment and strict management to ensure efficiency and sustainability in the process of wastewater treatment. Natural Star Vina is a reputable wastewater treatment design and construction unit for many years, committed to bringing you the most satisfaction and peace of mind.

Scroll to Top