CPCB SOP for Spent Calcium Chloride Utilization in Pigment Violet Production Introduction The Central Pollution Control Board (CPCB), in April 2025, released a detailed Standard Operating Procedure (SOP) for the utilization of spent Calcium Chloride powder—a hazardous waste by-product generated during the manufacturing of Triethyl Phosphite (TEP) and Trimethyl Phosphite (TMP). The SOP is framed…
