Printing dyeing industry-Industrial Field-XINLEI

Aeration Solutions for Wastewater Treatment in the Printing and Dyeing Industry

Aeration is a core step in wastewater treatment. It provides sufficient oxygen and the necessary air power to ensure the aerobic metabolic activities of microorganisms, promote effective contact between microorganisms and dissolved oxygen, and thereby improve wastewater treatment efficiency.

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160,000

yuan

saved in energy consumption

energy saving rate

Industry Info

The application of aeration blowers in wastewater treatment for the printing and dyeing industry is as follows:

Pre-processing

Intercept large impurities through grates/screens and balance water quality and quantity in the regulating pool.

Physical treatment

Use coagulation sedimentation or flotation to remove most of the color, colloidal substances, and part of the COD.

Hydrolysis acidification

Under anaerobic conditions, difficult-to-degrade macromolecular organic substances are broken down into small molecules that are easy to treat.

Aerobic treatment

In the aeration pool, microorganisms (activated sludge or biofilm) are used to decompose organic matter under aerobic conditions, significantly reducing COD.

Slurry separation

Separate the treated water from the microbial sludge in the secondary settling pool.

Deep treatment

Further removal of residual color, recalcitrant organic matter, and salts is achieved through adsorption, advanced oxidation, or membrane technology to ensure compliance with standards or reuse.

Sludge treatment

The separated sludge is concentrated, dewatered (e.g., by pressure filtration), and finally disposed of (e.g., by incineration or landfill).

Process Flow Diagram

Pain point background

The core challenges in wastewater treatment for the printing and dyeing industry stem from the complex composition, high treatment difficulty, and substantial costs of the effluent. The wastewater contains large amounts of non-biodegradable dyes (e.g., az

Pain point 1

The active dye molecules remaining in wastewater have a stable molecular structure and are resistant to biodegradation. Conventional coagulation processes can only remove 40% of the color, necessitating the use of high-cost ozone oxidation or Fenton advanced oxidation technologies (increasing the cost of treating a single ton of water by 2-3 yuan). Additionally, the bromate byproducts generated by ozone oxidation may pose risks of secondary pollution.

Solution

The Xinlei technical team conducted an on-site survey at the wastewater treatment facility of Wujiang Times Printing & Dyeing Co., Ltd., thoroughly investigating the actual treatment conditions and aeration requirements of their high-color, high-salinity dyeing wastewater. Addressing the client's pain points of high energy consumption and significant room for efficiency improvement in their existing aeration system, the Xinlei team tailored a high-efficiency, energy-saving solution: supplying a 55kW Xinlei air-suspended centrifugal blower to successfully replace the existing 75kW Roots blower.