A major problem for most petrochemical and chemical companies is the disposal of sludge waste generated during the filtration, precipitation, and neutralization stages that are stored in large quantities in sludge ponds or on industrial sites. In the production of chlorine and caustic soda, solid and liquid sludge wastes are generated along with the target product. The chemical composition of chlorine and caustic soda production sludge was determined, the phase composition of the sludge and its structure were studied. Based on the results of the research, a fundamental technological scheme for sludge processing was developed and «Recommendations for the design of the scheme and basic equipment of the sludge processing unit for soda-caustic treatment of brine from chlorine and caustic soda production by the membrane method» were issued. Taking into account the importance of rational use of natural resources and environmental protection, new methods of utilization and processing of chlorine and caustic soda production sludge have been developed, which allows obtaining a target product that can replace scarce and expensive components.