Low-Temperature Evaporation and Concentration Equipment for Wastewater

Its core function is to evaporate and separate the water from the wastewater, achieving volume reduction without completely converting salts into solid crystals.

This solution is primarily suited for reducing the volume of high-concentration waste liquids and decreasing the volume of hazardous waste requiring disposal. The treatment process produces a concentrated mother liquor, which remains in liquid form and is transported off-site for disposal.

Applicable wastewater types include high-COD, difficult-to-biologically-degrade effluents; RO concentrate generated by membrane systems; oil-containing emulsified effluents; paint cleaning wastewater; and plate washing and developing wastewater.

Features: Lower equipment investment, simple operation and maintenance, and low susceptibility to clogging. It is suitable for scenarios where salt content is not extremely high and the primary goal is simply to reduce the volume of wastewater. Many high-concentration wastewater streams in coating, printing, steel, and papermaking workshops prioritize the concentration-type system.

Low-Temperature Evaporation and Crystallization Equipment for Wastewater

This process continues evaporation beyond the concentration stage to bring the salt content in the water to a supersaturated state, causing solid salt crystals to precipitate, after which the salt residue is separated.

The core objective is true zero liquid discharge (ZLD): after treatment, the condensate can be reused, solid salt is produced, and there is no longer a large volume of liquid mother liquor requiring off-site transport.

Applicable wastewater types include high-salinity wastewater with high chloride, calcium, and magnesium ion concentrations, particularly in scenarios requiring zero discharge—a typical example being desulfurization wastewater from the steel industry.

Characteristics: The equipment has a more complex structure, involves higher capital and operational costs, is prone to scaling and pipe blockages, and requires strict pretreatment of the wastewater. It is generally selected only for projects with mandatory zero-discharge targets.