The membrane-based zero liquid discharge (ZLD) system is an integrated solution designed for advanced industrial wastewater treatment and resource recovery. Its goal is to maximize water reuse and achieve zero wastewater discharge.
By combining membrane separation technologies with evaporation and crystallization processes, the system enables step-by-step purification and concentration of wastewater. The treated water can be reused in production, while the concentrated brine is converted into reusable solid materials, forming a true closed-loop system.
This system is suitable for treating complex wastewater with high salinity and high organic content across various industries.
The system adopts a combined process of pretreatment, MBR (membrane bioreactor), multi-stage reverse osmosis (RO), and MVR (mechanical vapor recompression) crystallization to achieve complete wastewater treatment and zero discharge.
First, the pretreatment unit removes large particles and suspended solids, ensuring stable feed conditions for downstream processes.
Next, the wastewater enters the MBR stage, where biological degradation and membrane separation work together to effectively remove organic pollutants and fine suspended solids, significantly improving water quality.
In the advanced treatment stage, a multi-stage RO system removes and concentrates dissolved salts and residual contaminants, producing water that meets reuse standards.
Finally, the high-concentration brine is treated using MVR crystallization. Through evaporation and crystallization, water is recovered and solids are separated, completing the zero liquid discharge process.
• High treatment efficiency: The combination of MBR and multi-stage RO effectively removes organic matter and salts
• High water recovery: Treated water can be directly reused in production, significantly reducing freshwater consumption
• True zero discharge: Evaporation and crystallization convert wastewater into reusable resources
• Strong adaptability: Suitable for various high-salinity and high-organic wastewater, such as dicarboxylic acid, methionine, and pigment wastewater
• Cost-effective and environmentally friendly: Reduces discharge costs and overall treatment expenses while meeting strict environmental standards
• Chemical industry: Treats wastewater from processes such as dicarboxylic acid, ammonium molybdate, and pigment production, enabling resource recovery and zero discharge
• Pharmaceutical industry: Applied in drug manufacturing wastewater treatment to reduce environmental impact and ensure compliance
• Food processing industry: Treats wastewater while ensuring water safety and enabling reuse
• Metallurgical industry: Handles smelting wastewater, reducing pollution and protecting water resources
• Industrial circulating water systems: Provides deep treatment of circulating water and high-concentration brine, enabling reuse and discharge reduction
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