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Explore our core evaporation equipment series engineered specifically for textile dye wastewater volume reduction and industrial concentration applications.
A Multiple Effect Vacuum Evaporator (MEVE) is a highly engineered industrial system that concentrates and reduces the volume of high-strength wastewater — including textile dye effluents — by leveraging the latent heat of steam across several successive evaporation stages, each operating under progressively lower vacuum pressure.
In the textile dyeing and finishing industry, enormous volumes of complex, heavily pigmented wastewater are generated daily. These effluents contain reactive dyes, disperse dyes, vat dyes, surfactants, salts, and auxiliary chemicals that make conventional biological treatment alone insufficient. The multiple effect vacuum evaporation process offers a proven, scalable, and energy-efficient pathway to achieve wastewater volume reduction by 80–95%, enabling downstream crystallization, resource recovery, or zero-liquid-discharge (ZLD) compliance.
Four core stages drive the efficient concentration of textile dye wastewater from raw effluent to a highly concentrated residue ready for crystallization or disposal.
Raw textile dye wastewater is screened, pH-adjusted, and preheated before entering the first evaporation effect, ensuring stable, continuous operation and protecting heat-exchange surfaces.
Steam introduced into the first effect heats the liquid, generating secondary vapor that heats the second effect — and so on through 3–6 effects — dramatically multiplying the energy value of each kilogram of steam consumed.
Each successive effect operates at a lower absolute pressure, enabling evaporation at reduced temperatures. This protects thermally sensitive components and minimizes scaling from dissolved dyes and salts.
Clean condensate is recovered for reuse in the dyeing process, while the concentrated dye/salt residue is discharged for crystallization, incineration, or resource recovery — achieving near-zero liquid discharge.
Zongheng's MEVE systems deliver unmatched performance, reliability, and cost-efficiency for the textile dyeing and finishing sector.
By reusing vapor heat across multiple effects, steam consumption per ton of water evaporated is reduced by 60–80% compared to single-effect evaporation, delivering significant operating cost savings for high-volume textile plants.
Consistently achieves 80–95% reduction in wastewater volume, dramatically lowering disposal costs, transport fees, and the footprint of downstream treatment systems.
Specifically designed to process high-COD, high-color, high-salinity textile wastewater containing reactive, disperse, vat, and sulfur dyes without fouling or corrosion issues.
Recovered condensate is sufficiently clean for reuse in rinsing or dyeing processes. The concentrated brine/dye residue can be further processed for salt recovery or energy-from-waste, supporting full zero-liquid-discharge objectives.
Robust falling-film and forced-circulation evaporator designs minimize fouling. CIP (clean-in-place) capability, corrosion-resistant materials, and automated PLC control ensure continuous, low-maintenance operation.
Helps textile manufacturers meet increasingly stringent national and international discharge standards (GB 4287, EU IED, Bluesign, ZDHC), avoiding fines and enabling sustainable production certifications.
The global textile industry is one of the largest industrial water consumers and polluters. China alone produces over 2.5 billion meters of dyed fabric annually, generating an estimated 2.5–3 billion tons of wastewater per year. Textile dyeing effluents rank among the most complex and difficult-to-treat industrial wastewaters due to their high color intensity, elevated COD (often 800–3,000 mg/L), significant salt content (10,000–80,000 mg/L TDS), and the presence of toxic auxiliary chemicals.
Conventional biological treatment systems struggle with the recalcitrant nature of synthetic dyes and high salinity, often failing to meet discharge standards. This has created a rapidly expanding market for advanced physical-chemical treatment technologies — with multiple effect vacuum evaporation emerging as the gold standard for volume reduction and ZLD achievement in modern textile facilities.
According to industry research, the global industrial evaporator market is projected to exceed USD 8.5 billion by 2030, with wastewater treatment applications — particularly in textiles — representing the fastest-growing segment driven by tightening environmental regulations worldwide.
The industry is evolving rapidly. Here are the key trends shaping the next generation of multi-effect vacuum evaporation technology for textile applications.
The combination of multiple effect evaporation with Mechanical Vapor Recompression (MVR) is becoming the preferred configuration for large-scale textile parks. MVR recycles secondary vapor via a high-efficiency compressor, achieving steam consumption as low as 0.03–0.05 kg per kg of evaporated water — a paradigm shift in energy efficiency that dramatically reduces operating costs for 24/7 production environments.
Modern MEVE systems are increasingly equipped with IoT sensors, real-time data acquisition, and AI-based predictive control algorithms that automatically optimize evaporation rates, steam consumption, and cleaning cycles. This reduces operator intervention, prevents scaling, and maximizes uptime — critical for continuous textile production operations.
Beyond simple volume reduction, leading textile manufacturers are investing in integrated evaporation-crystallization systems that recover high-purity sodium chloride or sodium sulfate from dye wastewater for reuse in the dyeing process. This circular economy approach reduces raw material procurement costs and eliminates hazardous brine disposal challenges.
Smaller and mid-size textile dyeing facilities increasingly require compact, modular evaporation solutions that can be rapidly deployed, scaled up, or relocated. Factory-skid-mounted and containerized multiple effect vacuum evaporator systems are gaining market share, reducing installation time and civil engineering costs.
Textile dyeing processes generate substantial low-grade waste heat from hot effluent streams, heat-setting ovens, and dryers. Next-generation MEVE designs incorporate waste heat recovery pre-heaters that utilize this otherwise wasted thermal energy to partially or fully drive the evaporation process, further slashing primary energy consumption and carbon footprint.
China's revised GB 4287-2012 textile dyeing discharge standard, the EU's Industrial Emissions Directive, and international sustainability frameworks (ZDHC, Bluesign) are driving mandatory adoption of advanced wastewater treatment technologies. Multiple effect vacuum evaporation is positioned as a core compliance technology as zero-discharge requirements become law in key manufacturing regions.
From reactive dye printing to high-salinity brine concentration, MEVE technology addresses the full spectrum of textile wastewater challenges.
High-color reactive and disperse dye wastewaters from cotton, polyester, and blended fabric dyeing are concentrated from 2–5% solids to 30–50% solids, reducing discharge volume by over 90% and enabling downstream incineration or dye recovery processes.
Reactive dyeing processes require large quantities of sodium chloride or sodium sulfate as exhausting agents. MEVE systems concentrate spent dye baths to saturation point, enabling downstream crystallizers to recover reusable textile-grade salt — turning a waste stream into a valuable resource.
Large textile industrial parks and dyeing clusters in China, India, Bangladesh, and Vietnam are deploying centralized multi-effect vacuum evaporation systems to treat combined effluents from dozens of individual dyeing facilities, achieving economies of scale and consistent regulatory compliance.
In water-stressed manufacturing regions, the high-quality condensate produced by MEVE systems — typically with COD below 50 mg/L and conductivity under 100 μS/cm — is directly recycled for rinsing, washing, and auxiliary dyeing operations, reducing freshwater intake by 60–80%.
For non-recoverable dye residues and mixed hazardous wastewater, MEVE pre-concentration dramatically increases the calorific value of the concentrate, reducing incineration fuel costs by 70–85% and minimizing flue gas volumes — a critical economic consideration for hazardous waste incineration facilities serving textile clusters.
Global fashion brands and retailers are imposing strict wastewater discharge requirements on their supply chains. MEVE technology enables tier-1 and tier-2 suppliers to achieve ZDHC MRSL compliance, Bluesign certification, and corporate sustainability commitments — increasingly a prerequisite for international market access.
Jiangsu Zongheng Concentration & Drying Equipment Co., Ltd.
Jiangsu Zongheng Concentration & Drying Equipment Co., Ltd. (formerly Yixing Yangxi Light Industry Machinery Factory), founded in 1992, is located in Zhoutie Town, Yixing City, on the shores of the beautiful Taihu Lake. The company covers an area of over 54,000 square meters, with a production workshop area of over 22,000 square meters.
Jiangsu Zongheng is a modern high-tech enterprise specializing in the manufacturing of concentration, drying, starch industry, alcohol DDGS, and Category III medium & low-pressure vessel equipment. It is currently a member enterprise of the China Starch and Alcohol Association. Its products are widely used in industries such as food fermentation, alcohol, chemical, pharmaceutical, environmental protection, and petrochemical.
The company's other main products include Tube Bundle Dryers, with design and manufacturing capabilities reaching 1600m² (making it a primary manufacturer of large tube bundle dryers). Other main products such as Single Screw Fiber & Germ Dehydrators and Wash Cyclones are recognized as high-quality products by starch manufacturers and the industry. High-quality products and a sincere service attitude have won consistent praise and trust from numerous users at home and abroad, fully demonstrating the company's first-class technical advantages and manufacturing capabilities for large-scale equipment.
Jiangsu Zongheng is always committed to exploration and innovation. Through years of sincere effort and user support, it has achieved sustained development. Main products include evaporation plants, comprising Multi-Effect Evaporators, Thermal Vapor Recompressors (TVR), Waste Heat Evaporators, and Mechanical Vapor Recompressors (MVR, achieving minimal unit energy consumption). These are widely used for liquid concentration, including distillates, alcohol stillage, ammonium sulfate, corn steep liquor, itaconic acid, threonine, starch sugar, sorbitol, glucose, fructose, trehalose, erythritol, organic wastewater, high-salinity wastewater, etc., making the company one of the domestic manufacturers with the most extensive product variety.
In March 2002, the company took the lead in obtaining ISO9001:2015 international quality system certification (Certificate No.: 45021), establishing a complete quality assurance system aligned with international standards. In July 2007, it became a Jiangsu Provincial High-Tech Enterprise. In April 2009, the company obtained the Special Equipment Manufacturing License of the People's Republic of China (License No.: TS2232C42). In August 2012, it acquired the ASME "U" Stamp authorization, marking the company's entry into a new phase of development. The company possesses strong R&D capabilities and advanced manufacturing processes, currently employing over 3 senior engineers and more than 20 engineers and assistant engineers. Multiple innovative technologies have been patented, and many products hold leading positions domestically.
The company currently holds an absolutely leading position in evaporation technology and has extensive cooperation with many renowned large domestic group companies, including Zhuofeng Biology, Meihua Group, Yufeng Group, Yihai Kerry, North China Pharmaceutical Group, Harbin Pharmaceutical Group, Shouguang Juneng, Qilu Pharmaceutical, Qiyuan Pharmaceutical, Xiwang Group, Shengtai Biology, Zhejiang Huakang, Kelun Pharmaceutical (Yili), and Shandong Tianli.
While meeting domestic market demand, the company's DDGS alcohol equipment and tube bundle dryer series products have been exported to Russia and Southeast Asian markets.
We are capable of providing professional technical support and after-sales service nationwide for our vast user base. High-quality products and their unique solutions not only enhance our corporate economic benefits but also bring us satisfaction by solving processing challenges for our clients.
We warmly welcome friends from various industries, both domestic and international, to visit us for cooperation and mutual development!
Explore our full range of industrial evaporation systems designed for wastewater volume reduction, energy efficiency, and sustainable manufacturing.
