I. Can the effluent be reused?

Absolutely, and this is the core purpose of low-temperature evaporation.

After treatment of cutting fluid, cleaning wastewater, machining wastewater, and high-salinity wastewater:

The conductivity is generally ≤50–200 μS/cm, with very low COD and clear, transparent water quality.

It can be directly reused for:

Cleaning processes, solution preparation, cooling circulating water, floor washing, and miscellaneous industrial water use.

The reuse rate can usually reach over 90%.

As long as the front-end oil and mist removal processes function properly, the reuse of condensed water is basically 100% stable and compliant with standards.

II. Can it be discharged directly?

Direct discharge is possible if conditions are met, but it is not recommended in most regions; reuse is strongly preferred.

Ideal scenario:

The effluent is clear, oil-free, odorless, with low levels of COD, ammonia nitrogen, and salinity.

It can be discharged if it meets local direct discharge standards.

Actual scenario:

Evaporation may carry volatile organic compounds and a small amount of oil mist into the condensed water.

When treating cutting fluid, emulsified liquid, and chemical wastewater, the effluent may contain trace COD and slight oil content.

Environmental protection requirements in many areas stipulate that evaporated effluent still requires simple post-treatment before discharge.

For more stable direct discharge, an additional step is usually added:

Activated carbon filtration,

or precision filtration combined with a small amount of oxidation.

After such treatment, the effluent can basically meet the standard of COD ≤50 for compliant direct discharge.

III. Summary in one sentence

Reuse: Completely feasible, the mainstream application, stable and reliable.

Direct discharge: Theoretically possible, but to ensure compliance with environmental regulations, simple additional treatment is generally recommended for greater safety.