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STL becomes world's first optical manufacturer to be 'Zero Liquid Discharge' certified

18 Oct 2022 , 02:23 PM

STL on Tuesday has announced that 100% of its Indian manufacturing facilities are now Zero Liquid Discharge (ZLD) certified by Deutsch Quality Systems (DQS India). This is a great milestone for STL in its UN SDG goal of attaining ‘Water Positivity by 2030’.

For STL, water management is a top priority in its materiality matrix. This has led STL to develop water-resilient communities through rainwater harvesting, technology intervention to optimise water demand and adherence to stringent Zero Liquid Discharge (ZLD) protocols.

AT STL, the water management process is carried out through Effluent Treatment (ETP) and Multi-effective Evaporator (MEE) plants. The ZLD process involves an in-depth understanding of the liquid waste profiles and in-plant modifications to minimise water usage. The wastewater is chemically treated to remove chlorine and solid particles.

It then undergoes three-tiered centrifugation to remove salt and suspended particles, making it fit for reuse in boilers and scrubbers. The entire process is digitally monitored using a Supervisory Control and Data Acquisition (SCADA) architecture and shift dashboards.

STL has replicated this ZLD framework successfully for all six manufacturing plants across Aurangabad and Silvassa, in Maharashtra, India.

All these combined initiatives have helped STL recycle ~130,000 cubic meters of wastewater from manufacturing in FY22 across its manufacturing facilities.

At around 2:26 PM, Sterlite Technologies Ltd is currently trading at Rs162.75 per share down by Rs2.1 or 1.27% from its previous closing of Rs164.85 per share on the BSE.

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