Textile Industry Dyeing Wastewater Treatment System

Textile Industry Dyeing Wastewater Treatment System

Product Overview

Drawing on 17 years of wastewater treatment technology expertise, SUN EURO POLO has developed an efficient dyeing wastewater treatment system specifically designed for the global textile printing and dyeing industry. Dyeing wastewater is particularly challenging due to its high color intensity, high organic concentration, significant quality fluctuations, and poor biodegradability. Our dyeing wastewater treatment system employs a multi-stage combined process that effectively removes color, COD, and various dye components, helping textile enterprises achieve stable compliant discharge.

Working Principle

The SUN EURO POLO dyeing wastewater treatment system utilizes a combined process flow of "pre-treatment + physicochemical decolorization + biological treatment + advanced treatment," with treatment capacities ranging from 50 m³/day to 10,000 m³/day, customizable based on the production scale and wastewater characteristics of individual dyeing enterprises. The system is suitable for dyeing wastewater from cotton, linen, silk, wool, and chemical fiber fabrics, including wastewater from desizing, scouring, bleaching, dyeing, printing, and finishing processes. After treatment, the effluent meets national or local discharge standards for color, COD, and suspended solids, with some projects capable of achieving water reuse.

The core process principles are as follows: Wastewater first passes through coarse and fine bar screens to remove fabric scraps, fibers, and other larger suspended solids, then enters an equalization tank for flow and quality balancing. Since dyeing wastewater discharge is intermittent and variable, the equalization tank is designed with sufficient retention time to ensure stable operation of downstream treatment units. The balanced wastewater then enters the physicochemical pre-treatment unit, where coagulants (such as polyaluminum chloride and polyacrylamide) are added to coagulate colloidal dye particles and suspended solids into larger flocs, which are then separated in dissolved air flotation or sedimentation equipment. This step can remove 60% to 80% of color and 40% to 60% of COD. The pre-treated wastewater then enters an anaerobic hydrolysis acidification tank where, under the action of facultative microorganisms, large molecular refractory organics are broken down into smaller, more biodegradable substances, improving wastewater biodegradability while some dye molecules are reduced and decolorized. The wastewater then enters the aerobic biological treatment unit (typically biological contact oxidation or activated sludge process), where aerobic microorganisms further degrade organic matter with removal rates reaching 80% to 90%. For regions with particularly stringent color requirements, the system includes advanced treatment units after biological treatment such as ozone oxidation or Fenton oxidation, which completely destroy the chromophore groups of residual dye molecules through strong oxidation, ensuring effluent color meets discharge standards.

Product Features

First, specialized optimization for dyeing wastewater. System process parameters are specifically designed for the high color, high alkalinity, and high COD characteristics of dyeing wastewater, achieving decolorization efficiency exceeding 95% and COD removal rates exceeding 90%. Second, flexible and adjustable combined process. Physicochemical and biological treatment intensities can be flexibly adjusted based on influent quality changes, including chemical dosing quantities and operating parameters, adapting to wastewater quality variations caused by adjustments in dyeing processes. Third, excellent color removal performance. Through the dual guarantee of physicochemical coagulation and advanced oxidation, effluent color stably meets standards, preventing environmental penalties for color exceedance. Fourth, comprehensive sludge disposal solutions. Physicochemical and biological sludge are collected and treated separately, with optional sludge dewatering equipment to reduce sludge moisture content below 80% for convenient subsequent disposal. Fifth, controllable operating costs. Through optimized chemical selection and dosing strategies, chemical consumption is minimized while maintaining treatment effectiveness; energy-efficient aeration equipment reduces power consumption. Sixth, optional reuse water quality. For enterprises with water reuse needs, filtration and disinfection units can be added to enable effluent to meet requirements for workshop floor cleaning, landscape irrigation, and other reuse applications.

Application Scenarios

This system is widely used in knitted fabric dyeing plant wastewater treatment (reactive dye, disperse dye wastewater), woven fabric dyeing plant wastewater treatment (vat dye, sulfur dye wastewater), printing plant wastewater treatment (pigment printing paste wastewater), denim garment washing plant wastewater treatment (indigo dye and stone washing wastewater), chemical fiber imitation silk dyeing wastewater treatment (disperse dye alkaline wastewater), and centralized wastewater treatment plants for textile industrial parks. In a large textile dyeing park project in the Middle East, the 3,000 m³/day dyeing wastewater treatment system provided by SUN EURO POLO has been operating stably for years, with all effluent indicators surpassing local discharge standards, effectively supporting normal production for more than 20 dyeing enterprises within the park.

Company Strength

Founded 17 years ago, SUN EURO POLO has grown to become one of the trusted wastewater treatment equipment suppliers for the global textile industry. Our annual production capacity reaches 500 large-scale treatment equipment sets, with several of our 15 patents specifically targeting dyeing wastewater decolorization and refractory organic matter removal technologies. Our technical team possesses extensive experience in textile industry wastewater treatment, with thorough knowledge of the chemical properties and degradation mechanisms of various dyes (reactive, disperse, vat, acid, sulfur, etc.), enabling us to provide precise solutions for dyeing enterprises with different fabrics and processes. Our production base is equipped with a comprehensive water quality analysis laboratory capable of conducting full water quality testing and pilot experiments on wastewater samples provided by customers, ensuring the scientific reliability of solution designs. Having served more than 30 countries worldwide, we have accumulated rich project experience and excellent reputation in textile industry concentrated regions such as Southeast Asia, South Asia, and the Middle East.

After-Sales Service

SUN EURO POLO provides textile enterprises with comprehensive services from project planning to long-term operation and maintenance. At the project initiation stage, we offer free wastewater quality testing services and develop technical solutions and economic analyses based on test results and discharge requirements. After solution confirmation, our design team communicates fully with customers to optimize equipment layout and pipeline design, maximizing utilization of existing site conditions. During equipment manufacturing and installation, customers may send personnel to the factory for supervision and learning, understanding equipment structure and installation essentials. During system commissioning, our process engineers provide on-site guidance, fine-tuning operating parameters based on actual influent water quality to ensure the system reaches optimal operating conditions in the shortest time. For training, we provide comprehensive training for operators covering process principles, equipment operation, chemical preparation, routine maintenance, and water quality testing. After-sales guarantees include 2-year whole-machine warranty, 5-year key equipment warranty, lifetime technical support, fast spare parts supply, and regular follow-up visits. We can also provide system operation and maintenance services based on customer needs, with professional teams handling daily operation management so customers can focus on their core production and business activities.

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