Zero Liquid Discharge Plants (ZLD)

Zero Discharge Sewage Treatment Plant(ZLD) as the name itself suggests, is a wastewater treatment process that minimizes the liquid waste discharge almost to ZERO at the end of an industrial process. Government has come up with tighter restrictions on discharge of industrial wastewater, therefore organizations are using advanced treatment methods as ZLDs so as to limit the legal and regulatory consequences that would accumulate should you violate any local effluent regulations. ZLD systems are introduced in the areas with limited water resources, or in the areas with environmental sustainability as the priority also in useful in places where the waterways are protected. .

Wastewater treatment by RO (Reverse Osmosis) membrane generates reject water, which is highly concentrated effluent with TDS. In most cases such reject water has to be treated further because legal norms may not be allow it to be discharged in that stage. Therefore, the next step is to install evaporators after RO. Evaporators evaporate the rejected water from RO & concentrate salts present there to dryness. Also, since evaporators are expensive system, it is a prerequisite in a ZLD system to install a high efficiency RO so that the RO-reject volume is minimized. Further, it is needed that the most optimized size of evaporator is installed.

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