In a lead-lag configuration, how are the treatment units typically arranged?

In a lead-lag configuration, the treatment units are arranged in sequential order to optimize the treatment process and ensure continuous operation. The lead unit is the primary treatment unit that actively processes the influent, while the lag unit serves as a backup. If the lead unit experiences a failure or requires maintenance, the lag unit can take over, allowing for uninterrupted treatment. This arrangement is beneficial for managing variations in flow and load while maintaining high performance. Sequential arrangement ensures that one unit is always ready to take over immediately without delays, enhancing reliability and efficiency in treatment operations.