The textile and dyeing industry is one of the largest industrial water consumers and wastewater generators worldwide. Textile wastewater is characterized by intense color, high chemical oxygen demand (COD), varying pH levels, and complex mixtures of synthetic dyes, sizing agents, surfactants, and heavy metals that make it extremely difficult to treat with conventional methods.
Different stages of textile processing — from desizing, scouring, and bleaching to dyeing and finishing — each produce distinct wastewater streams with unique pollutant profiles. Reactive dyes, in particular, have very low fixation rates (60–70%), meaning up to 40% of the dye ends up in the effluent, creating deeply colored wastewater that is resistant to biodegradation.
Zhongsheng Environmental provides integrated treatment systems specifically engineered for the textile industry, combining physical-chemical pre-treatment with advanced biological processes to achieve effective color removal, COD reduction, and regulatory compliance while maximizing water recovery for reuse in production.
Intense Color & Dye Residues: Synthetic dyes create deeply colored effluent that is highly visible and resistant to conventional biological treatment. Even small concentrations (10-50 mg/L) produce unacceptable color levels.
High Chemical Load: Sizing agents, surfactants, bleaching chemicals, and auxiliary compounds create COD levels of 1,000–3,000 mg/L with wide pH fluctuations from 2 to 12.
Heavy Metal Contamination: Certain dye classes (chromium-based, copper-based) introduce heavy metals that require specialized removal before discharge.
High Water Consumption: Textile manufacturing uses 100–300 liters of water per kg of fabric, making water recycling essential for both cost savings and sustainability compliance.
Multi-stage treatment approach for textile and dyeing wastewater
A large equalization tank homogenizes fluctuating flows and pH levels (2–12) from different process stages, ensuring consistent feed conditions for downstream treatment.
Chemical dosing (PAC, polymer) breaks colloidal dye particles, followed by dissolved air flotation to remove color, suspended solids, and emulsified oils. Achieves 80–90% color removal.
Two-stage biological process: anaerobic treatment breaks the azo bonds in reactive dyes, followed by aerobic oxidation for COD reduction. Combined removal rate exceeds 90%.
Ozone or Fenton oxidation destroys residual color and recalcitrant organics. UF/RO membranes produce high-quality permeate suitable for reuse in dyeing processes, achieving 60–80% water recovery.
Specialized wastewater treatment equipment for the textile industry
ZSQ series dissolved air flotation (DAF) system for high-efficiency removal of suspended solids, FOG, oil & grease, and colloidal matter from industrial wastewater. Micro-bubble technology with automatic skimming handles 4–300 m³/h across 13 standard models. Proven in food processing, pulp & paper, textile, metalworking, petrochemical, and municipal pre-treatment applications.
Integrated MBR membrane bioreactor system combining activated sludge treatment with submerged PVDF membrane filtration. Delivers near-reuse-quality effluent (<1 μm filtration) with 60% smaller footprint than conventional systems. Ideal for municipal sewage, industrial process water, and water reuse projects from 10 to 2,000 m³/day.
Zhongsheng Environmental industrial RO systems deliver ultra-pure permeate at recovery rates up to 95%, serving pharmaceutical, semiconductor, food & beverage, and power generation applications worldwide. Fully automated PLC-controlled operation with continuous output and minimal chemical consumption.
Zhongsheng Environmental multi-media filters remove suspended solids, turbidity, and colloidal matter from raw water, achieving SDI values suitable for downstream RO membrane protection. Robust, low-maintenance vessels with long-life filter media and automated backwash.
Zhongsheng Environmental automatic chemical dosing systems provide precise, PLC-controlled injection of coagulants, flocculants, pH adjusters, and specialty chemicals for water and wastewater treatment. Skid-mounted, pre-wired, and factory-tested for rapid installation.
Zhongsheng Environmental plate and frame filter presses deliver efficient solid-liquid separation for municipal and industrial sludge dewatering, with filtration areas from 1 m² to 500 m² and manual, hydraulic, or fully automatic PLC-controlled operation.
Zhongsheng Environmental high-efficiency sedimentation tanks (lamella clarifiers) combine sludge recirculation, flocculation, and inclined-plate separation in a single compact structure — achieving surface loading rates of 20–40 m/h while reducing chemical consumption by up to 30%.
Our engineers specialize in textile wastewater with experience treating reactive, disperse, and vat dye effluents. Get a free consultation and customized treatment proposal.
