Wastewater treatment technology for the leather and footwear industry

The leather and footwear industry is Vietnam's strong export product, bringing a large source of foreign exchange revenue to the country. However, the development of this manufacturing industry has a negative impact on the surrounding environment, especially the water environment, requiring appropriate wastewater treatment technology.

The wastewater treatment system for the leather shoe industry currently has many factories and businesses investing and constructing, in order to minimize the risk of causing pollution into the environment. Below is some basic information about wastewater treatment technology, let's find out

Impact of leather shoe factory wastewater on the environment

The leather tanning industry, also known as the footwear industry, is a long-standing manufacturing industry in the world. The main raw materials used for the footwear industry are animal leather such as cowhide, rabbit leather, sheepskin, and pigskin. The production process's purpose is to change animal skin so that it is durable, does not wrinkle, rot...

Almost all production stages of the leather and footwear industry generate wastewater. The composition of wastewater from the leather shoe industry includes:

Domestic wastewater has high levels of organic matter, nitrates, phosphates and bacteria.
Wastewater from the leather and footwear industry has very high concentrations of TSS, COD, BOD, SS, alkalinity and color, exceeding the standards. If not treated, it will affect the water environment and aquatic animals, as well as the health of people living around.

Diagram of wastewater treatment system for the footwear industry

Existing wastewater treatment technologies for the leather and footwear industry that are commonly applied include traditional activated sludge technology, Aerotank aerobic biological treatment technology and a number of other technologies.

- Collection tank

Wastewater from the production process of the leather and footwear industry is directed through the trash screen and brought to the collection tank.

- Air tanks

From the collection tank, wastewater is pumped to the regulation tank, which regulates the flow and concentration of wastewater.

The aeration system at the tank operates continuously to disturb the wastewater, avoiding sedimentation and anaerobic decomposition in the tank.

- Flocculation tank - flocculation

PAC, NAOH and polymer chemicals are added to wastewater to bind pollutants into large-sized sludge flocs that settle to the bottom of the tank.

- Clarifier

The settled sludge is periodically pumped to the sludge tank, dried, packaged, and taken for treatment. The water in the settling tank is allowed to overflow through the intermediate tank.

- Aerobic biological tank

The clear water after settling is led through the aerobic biological tank Aerotank, aerobic microorganisms decompose organic matter in wastewater into simple inorganic substances, fully supplied with oxygen.

- Biological sedimentation tank

Wastewater is led through the sedimentation tank to deposit the biological sludge to the bottom of the tank. A part of the settled sludge is led to the sludge tank, and a part is circulated for biological treatment to ensure the density of microorganisms in the tank.

- Pressure filtration equipment

The clear water after settling is passed through a pressure filter to remove remaining residue and deodorize.

- Disinfection tank

Wastewater is led through the disinfection tank as the final step to destroy remaining pathogenic microorganisms. The treated wastewater meets QCVN 40:2011/BTNMT standards.

Advantages of wastewater treatment technology in the leather and footwear industry

- Treats wastewater sources with high efficiency, does not cause pollution when discharged into the environment

- Low installation and operating costs

- Easy operating system

E&C Vietnam Environmental Technology Services Joint Stock Company is an expert in consulting and designing wastewater treatment systems for the leather and footwear industry for companies and businesses across the country applying modern treatment technology, with a team of Team of experienced engineers, short construction time. In addition, we also support consulting on procedures and applications for waste discharge permits. If you have any needs, please contact hotline 0941 113 286.

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