Electrochemical wastewater treatment equipment for treating high-salinity

Product Specification

Product Overview

This equipment is specifically designed for the treatment of high-salinity wastewater. High-salinity wastewater is widely generated in chemical, pharmaceutical, printing and dyeing, pesticide, electroplating, and reverse osmosis concentrate from zero-discharge projects. It typically contains high concentrations of dissolved salts (NaCl, Na₂SO₄, CaCl₂, etc.) as well as recalcitrant organic matter, dyes, auxiliaries, and other pollutants. Traditional biological treatments are hampered by high salinity, and physicochemical methods often require large amounts of chemicals, producing chemical sludge and incurring high operating costs.

This system employs electrochemical oxidation technology, utilizing the electrolytes naturally present in the high-salinity wastewater to generate hydroxyl radicals and active chlorine at the anode, effectively degrading organic matter and removing color and toxicity. The entire treatment process requires no added chemicals, producing no secondary pollution or chemical sludge. The electrode modules feature a corrosion-resistant and anti-scaling design, ensuring long-term operation without corrosion, scaling, or clogging, making it particularly suitable for demanding water qualities such as high salinity, high chlorine, and high hardness. The equipment operates fully automatically, has a small footprint, and can be used as a pretreatment or advanced treatment unit for high-salinity organic wastewater.

High-salinity wastewater treatment challenges points and solutions provided by this equipment

Working principle

High-salinity wastewater enters the electrochemical reactor after pre-filtration. Under the action of electrodes:

Indirect electro-oxidation: Chloride ions (Cl⁻) in the wastewater are oxidized to active chlorine (Cl₂, HOCl, OCl⁻) at the anode. The active chlorine further oxidizes organic matter in the water, degrading it into CO₂, H₂O, or small molecule harmless substances. Due to the high salt content and high conductivity, the reaction rate is fast, and energy consumption is relatively low.

Direct electro-oxidation: Organic pollutants are directly oxidized by electron transfer on the anode surface, especially effective for some recalcitrant aromatic compounds.

Hydroxy radical oxidation: The anode simultaneously generates a non-selective strong oxidant ·OH, which attacks complex organic matter.

The treated high-salinity wastewater has a significantly reduced organic content and can be directly discharged, reused, or further desalinated in an evaporation system. The amount of scum is minimal, and it does not constitute chemical sludge.

Core advantages (for high-salinity wastewater)

Technical parameters (customizable)

Scope of application

High-salt organic wastewater from chemical industry: Contains NaCl, Na₂SO₄, nitrobenzene, aniline, chlorinated hydrocarbons, etc., with a salinity of 5%~20%.

High-salt wastewater from pharmaceutical industry: Contains mother liquor from antibiotics and synthetic drugs; high salt content and strong toxicity. Electrochemical oxidation detoxification and COD reduction are employed.

High-salt wastewater from dyeing and printing: Contains Na₂SO₄, NaCl, reactive dyes, and disperse dyes. Electrochemical efficient decolorization and COD degradation are performed.

High-salt wastewater from pesticide industry: Contains organophosphates, organochlorines, and other recalcitrant substances. Electrochemical degradation of toxic functional groups is employed. Reverse osmosis concentrate (RO concentrate): Salt content is concentrated to 1-3 times, organic matter is enriched, and electrochemical deep treatment achieves compliance or reuse.

Evaporation condensate/distilled water upgrading: Although the salt content is low, it contains a small amount of volatile organic compounds, which can be further purified electrochemically.

Zero-discharge project brine: Organic matter is removed before evaporation to avoid coking in the evaporator and an increase in hazardous waste in the mother liquor.

Oilfield produced water/fracturing flowback fluid: High in salt and COD, electrochemistry is an effective pretreatment or primary treatment method.

Process Flow

Option 1: Pretreatment (Protecting Evaporation/Membrane Systems)

High-salt organic wastewater → Electrochemical treatment → Evaporation (MVR/Multi-Effect) or membrane system → Permeate reuse

This significantly reduces evaporator coking and foaming, extends cleaning cycles, and reduces the amount of hazardous mother liquor.

Option 2: Separate Treatment (Meets Discharge Standards)

High-salt organic wastewater → Electrochemical treatment → Sedimentation/Filtration → Meets Discharge Standards (Suitable for wastewater where salinity meets discharge standards and COD needs to be reduced)

Option 3: Deep Treatment of RO Concentrate (Zero Discharge Support)

RO system → RO concentrate → Electrochemical treatment → Return to RO pre-treatment/Direct discharge/Evaporation

Why choose us?

Designed specifically for high-salt wastewater: Electrodes are optimized for high-chlorine, high-salt environments, offering corrosion resistance, scale resistance, and a long lifespan.

No secondary pollution: No chemical sludge, no waste gas, no waste liquid – truly clean treatment.

Modular and scalable: Can be flexibly combined according to water volume and concentration, allowing for phased construction.

Fully automatic operation: Adapts to water quality fluctuations, automatically adjusting current to minimize manual intervention.