Zero-liquid discharge (zld) wastewater treatment apparatus and method

A zero liquid discharge (ZLD) wastewater treatment apparatus comprising:

• a concentrator configured to concentrate wastewater to produce a primary concentrate;
• an evaporation crystallizer configured to concentrate and crystallize the primary concentrate to produce a secondary concentrate;
• a cooling crystallizer configured to cool and crystallize the secondary concentrate;
• a dehydrate configured to separate the product produced by the cooling crystallizer into a solid component and a liquid component;
• a cooling system configured to cool the secondary concentrate introduced into the cooling crystallizer;
• and
• a pretreatment device configured to pretreat the wastewater supplied to the concentrator,
• wherein the liquid component produced by the dehydrator heat exchanges with a cooling medium in the cooling system and returns to the evaporation crystallizer.

A zero-liquid discharge (ZLD) wastewater treatment method comprising:

• concentrating wastewater to produce a primary concentrate;
• evaporating crystallization by evaporating the primary concentrate for concentration and crystallization of the primary concentrate to produce a secondary concentrate;
• cooling crystallization by cooling, by a cooling system, the secondary concentrate to generate crystals;
• dehydrating by separating the product produced by the cooling crystallization into a solid component and a liquid component;
• and
• recovering the liquid component produced through the dehydrating and returning the liquid component to the evaporating crystallization,
• wherein the liquid component produced by the dehydrating heat exchanges with a cooling medium in the cooling system and returns to the evaporating crystallization.