Case Study

Case Study: Chemplast Chooses Aquatech's HERO™ & ZLD

Source: Aquatech International Corporation

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Case Study: Chemplast Chooses Aquatech's HERO™ & ZLD

By Aquatech International Corporation

The Chemplast unit has multiple waste streams, primary source being the Caustic soda and PVC monomer plants. The combined waste water is heavy in contaminants like oil & grease, volatile organic compounds, and has a relatively high COD and TDS of about 10000 mg/l. The water is potentially bio-active and also has a high fouling and scaling tendency.

As an environmentally conscious corporate entity, Chemplast's primary intent was to treat the rejects from the Reverse Omosis system by Evaporation / Crystallization so as to achieve Zero Liquid Discharge (ZLD). They also wished to process the combined effluent to recycle the treated soft water for cooling tower make-up and other usages in the plant.

Wastewater rich in BOD, COD, oil & grease etc. leads to frequent fouling due to biological and organic compounds in a Reverse Osmosis membrane system, and is thus difficult to treat with any of the conventional effluent recycle & ZLD technologies.

For Chemplast, Aquatech designed a ZLD System based on the HERO™ (High Efficiency Reverse Osmosis) technology, an advanced RO process, wherein the RO section is operated in a high pH environment. The major parameters affecting the RO system operation are kept within limits enabling high (water) recoveries in the range of 88 – 90%.

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Case Study: Chemplast Chooses Aquatech's HERO™ & ZLD