What is typically the maximum limit for chlorine residual in treated effluent?

The maximum limit for chlorine residual in treated effluent is commonly set at 2.0 mg/L. This standard is based on regulatory guidelines that aim to minimize the environmental impact of chlorine on aquatic ecosystems. Chlorine can be toxic to aquatic life, so maintaining the residual at or below this threshold helps ensure the safety and health of receiving waters, while still providing effective disinfection during the treatment process.

Regulations may vary slightly depending on the specific discharge permit and local regulations, but a chlorine residual of 2.0 mg/L is often used as a benchmark in wastewater treatment operations to effectively balance disinfection needs and environmental protection.