Electrochemical wastewater treatment equipment, applicable to: wastewater

Product Specification

Electrochemical wastewater treatment equipment, applicable to: wastewater treatment of pretreatment, dyeing/printing and finishing processes in dyeing and printing industry

Quick Details

Dyeing and printing wastewater is a typical high-concentration, refractory organic wastewater discharged by the textile industry, characterized by distinct water quality features and significant treatment challenges. It contains large amounts of unfixed dyes (including hydrophilic reactive dyes, hydrophobic disperse dyes, and complex cationic dyes), various textile auxiliaries (such as sizes, surfactants, acids/bases, printing mordants), and impurities washed off from fibers. This results in prominent characteristics of high color, high chemical oxygen demand (COD), high salinity, and significant fluctuations in water quality. Furthermore, many dye molecules and auxiliary components in the wastewater have stable structures and poor biodegradability, containing refractory functional groups such as benzene rings, naphthalene rings, and azo bonds. Employing the traditional "coagulation-sedimentation + biological treatment" process often faces challenges such as high coagulant dosages, generation of large quantities of hazardous chemical sludge, poor color removal efficiency for water-soluble dyes, and unstable operation of biological systems due to salinity and toxicity inhibition, making it difficult to stably achieve increasingly stringent discharge and reuse standards for effluent color and COD.

Addressing the core challenges of dyeing wastewater—"high color difficult to remove, high COD difficult to degrade, high salinity inhibiting biological treatment"—the CQDHX SERIES EO Electrochemical Oxidation Equipment, developed and manufactured by our company (AA&SS AQUA HITECH CO., LTD.), generates highly oxidizing reactive species, such as hydroxyl radicals, in-situ on the electrode surface through electrocatalytic action. These species can non-selectively attack chromophores (e.g., azo bonds) and stable structures like benzene rings within dye molecules, decomposing them completely into small inorganic molecules, thereby achieving efficient decolorization and deep COD removal. Its fundamental advantage lies in: the entire advanced oxidation process requires absolutely no addition of any chemical oxidizing agents (such as hydrogen peroxide, persulfate), completely eliminating the issues of soaring operational costs and salt accumulation associated with chemical dosing from the source. Simultaneously, this purely electrochemical process does not generate any additional chemical sludge or residual solid waste, producing only a minimal amount of physicochemical sludge derived from the wastewater's own suspended solids. This greatly simplifies sludge disposal and reduces environmental risks.

Wastewater first undergoes conventional pretreatment, including screening to remove fiber lint and equalization in a regulating tank to balance the highly fluctuating pH, water quality, and quantity. Subsequently, the wastewater can enter the EC Electrochemical Equipment for treatment. The micro-flocculants generated electrolytically efficiently remove colloidal particles, some suspended dyes, and hydrophobic substances from the wastewater. They can also preliminarily破坏 the molecular structure of some dyes through redox reactions, significantly reducing the color and COD load while improving the treatability of the wastewater, creating stable conditions for subsequent deep oxidation.

The supernatant, after pretreatment and solid-liquid separation, contains primarily dissolved, hydrophilic, refractory dye molecules and auxiliaries as pollutants. At this point, the wastewater enters the CQDHX SERIES EO Electrochemical Oxidation Equipment. Here, strong electrochemical oxidation delivers the ultimate degradation to all remaining complex organic compounds. Our company's equipment, leveraging its electrode materials optimized for high-salinity, high-color wastewater and its efficient reactor design, ensures the continuous, stable, and abundant generation of highly oxidizing free radicals. This enables the broad-spectrum and thorough decomposition and mineralization of various types of dyes and auxiliaries. The effluent color can approach colorless, with significant COD removal.

Finally, the effluent after deep oxidation by the CQDHX SERIES EO Electrochemical Oxidation Equipment, based on discharge or reuse requirements, undergoes simple pH readjustment and monitoring to stably meet the required standards.

Through the CQDHX SERIES EO Electrochemical Oxidation Equipment developed and manufactured by our company, operating in a clean mode without chemical addition and without generating chemical sludge, the fundamental problems of difficult decolorization and degradation in dyeing wastewater are efficiently overcome. This not only ensures stable compliance and reuse potential of the effluent but also significantly reduces the lifecycle treatment costs and solid waste disposal burden. It provides solid and reliable core equipment support for the green transformation and sustainable development of the textile dyeing and printing industry.

For wastewater with special characteristics or unique treatment objectives, our company's engineers provide technical support and solutions.

Technical specifications for 10 tons/day wastewater treatment capacity

Precautions:

1. The equipment must be installed in a well-ventilated, rain-sheltered, non-explosion-proof area.
2. The equipment power supply uses a three-phase five-wire system, and the equipment must be reliably grounded.
3. Do not strike the electrodes with hard objects.

Application Scope:

Pretreatment wastewater, dyeing wastewater, printing wastewater, finishing wastewater, washing wastewater, etc.

Dye intermediate wastewater is oxidation wastewater generated during the production process. It primarily contains over 10 types of benzene-ring organic compounds, with the main salt content being 12% sodium sulfate.

Main pollutants in dispersed dye intermediate wastewater: xylene, nitrobenzene, sodium sulfate, etc.

Dyeing Wastewater Treatment Process

Process 1

Dyeing wastewater

↓

EC ELECTROCHEMICAL SYSTEM

(Solid-liquid separation, removes part of the suspended solids, colloids, and colloidal dyes)

↓

CQDHX SERIES EO ELECTROCHEMICAL OXIDATION TREATMENT EQUIPMENT

(Efficiently destroys dye chromophores, degrades refractory organic matter, degrades COD)

↓

Emission

Process 2

Dyeing wastewater

↓

EC ELECTROCHEMICAL SYSTEM

(Solid-liquid separation, removes part of the suspended solids, colloids, and colloidal dyes)

↓

Pretreatment System (Optional)

(Improves the efficiency of the electrochemical oxidation system)

 ↓

CQDHX SERIES EO ELECTROCHEMICAL OXIDATION TREATMENT EQUIPMENT

(Efficiently destroys dye chromophores, degrades refractory organic matter, degrades COD)

↓

Emission

Treatment Capacity of Electrochemical Oxidation Wastewater Treatment Equipment