Overview
Zero Liquid Discharge (ZLD) is an advanced wastewater treatment process designed to recover and reuse water while eliminating liquid effluent discharge from an industrial facility. It typically combines biological or physico-chemical treatment, membrane technologies such as UF and RO, and thermal systems such as MEE, crystallizers, and ATFD to recover water and convert residual dissolved salts into solids for recovery or disposal.
INDION Multi Effect Evaporator
Ion Exchange offers advanced Zero Liquid Discharge (ZLD) solutions integrated with INDION® Multi-Effect Evaporators (MEE) to maximize water recovery, minimize wastewater discharge and promote sustainable industrial operations. Designed as reliable end-of-pipe treatment solutions, these systems integrate effluent recycling technologies with advanced evaporation processes to reduce liquid waste and support compliance with stringent environmental regulations. Our comprehensive product range includes Falling Film Evaporators, Forced Circulation Evaporators, Thermo Vapour Re-compressors (TVR), Mechanical Vapour Re-compressors (MVR), Agitated Thin Film Dryers and Scraped Surface systems. By combining these technologies with pretreatment, biological treatment and membrane systems, Ion Exchange delivers integrated ZLD solutions that optimize water reuse, reduce freshwater consumption and operating costs, and support responsible industrial water management.
Brine concentration
The system efficiently handles RO reject & further concentrates brine for effective treatment and resource recovery. It achieves high concentrations (>20% NaCl) with minimal energy use compared to other brine concentration methods. Its chlorine-tolerant membrane material reduces biological fouling and energy recovery is optimized for larger capacities. It delivers the lowest lifecycle cost compared to existing processes.
Crystallization
Crystallization in a Zero Liquid Discharge (ZLD) Process is the final stage of treatment, where concentrated brine from an evaporator or MEE is further processed to convert dissolved salts into solid crystals.
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