Product Introduction: The dyeing and finishing industry is a major water consumer, with its wastewater discharge volume and total pollution amount ranking fourth among all industrial sectors in the country, making it one of China's key pollution industries.

Introduction to Printing and Dyeing Wastewater Treatment

The dyeing and printing industry is a major water consumer, with its wastewater discharge volume and total pollutants ranking fourth among industrial sectors nationwide, making it one of China's key polluting industries. Dyeing and printing wastewater has always been a focus and challenge in wastewater treatment technology due to its high discharge volume and treatment difficulty. Concurrently, with the rapid economic development of our country, water scarcity has become a limiting factor制约ing the further development of the dyeing and printing industry. To achieve sustainable development in the dyeing and printing industry, the resourceful reuse of dyeing and printing wastewater is crucial to reaching this goal.

Based on the summary of operation experiences of wastewater treatment equipment in the dyeing and finishing industry both domestically and internationally, and in conjunction with our company's scientific research achievements and engineering practices, we have designed a complete set of organic wastewater treatment equipment that can be buried underground. The equipment utilizes advanced technology from the late 1990s both domestically and internationally, producing wastewater treatment systems primarily made from stainless steel and carbon steel corrosion-resistant structures. The main purpose is to process dyeing and finishing wastewater, as well as similar industrial organic wastewater, to meet national discharge standards after treatment through this integrated unit. The equipment is primarily used for wastewater treatment in small and medium-sized dyeing and finishing enterprises or those with limited space. The effluent quality from this equipment meets national discharge standards. The entire equipment set can be buried underground, hence also known as "buried integrated wastewater treatment." It is suitable for various high-concentration dyeing and finishing wastewater, such as knitting dyeing wastewater, wool dyeing and finishing wastewater, silk dyeing and finishing wastewater, chemical fiber dyeing and finishing wastewater, and woven cotton and cotton blended textile dyeing and finishing wastewater.

II. Basic Working Principle of Printing and Dyeing Wastewater Treatment Equipment

The equipment utilizes the activated sludge process to achieve the purification of wastewater. The principle involves using anaerobic and aerobic bacteria to consume organic pollutants in the wastewater through their own life activities. At the same time, the microbial bioflocs destabilize and flocculate suspended and colloidal organic pollutants, adsorbing them onto the surface of the activated sludge. This results in the degradation of organic matter, ultimately achieving the purification of wastewater.

Section 3: Technical Specifications of Printing and Dyeing Wastewater Treatment Equipment

Basic Structure: Composed of corrosion-resistant components made of fiberglass or carbon steel. The equipment is equipped with underwater aeration, driven by water flow, forming a dual-functional aeration system. During wastewater treatment, wastewater flows into the aeration zone from the top of the unit. The underwater aeration unit曝气 while propelling and stirring the wastewater, allowing the incoming wastewater to quickly mix thoroughly with the existing mixed liquid, adapting to changes in the water quality of the incoming wastewater to the fullest extent. The aeration unit, with its dual function of water flow propulsion and underwater aeration, ensures regular cyclic flow in the aeration zone, thereby increasing the dissolved oxygen content in the wastewater. Due to the continuous cyclic flow of wastewater in the aeration zone, the water quality across the zone is relatively uniform, with similar microbial quantities and properties, resulting in nearly identical working conditions across different parts of the aeration zone. This controls the entire biochemical reaction under favorable and uniform conditions. Organic matter is gradually degraded by microorganisms, leading to the purification of wastewater. High purification efficiency: COD removal rate of 85%～90%, effluent indicators meet the national "Discharge Standards for Pollutants from Textile Dyeing and Finishing Industry" (GB 4267-92), and meet the standards for discharge. It can also be further customized to clients' requirements for ozonation-based deep treatment, reaching the "Water Quality Standard for Recycled Water Use in Landscape Environmental Water" (GB/T 18921—2002) for reuse.