Patent ID: 8021543

Claim:
A wastewater treatment system for treating excess wastewater from a sewer system, the wastewater treatment system comprising: a treating agent dispenser for introducing a treating agent into the wastewater; a container adapted to receive excess wastewater from the sewer system, the container having first and second portions that each have an upper end and a lower end, the lower ends being interconnected; a generally horizontally oriented screen arrangement disposed in the second portion of the container, the screen arrangement including multiple screens that each have a lower surface, and a support structure for supporting the screens, the support structure including a raised portion defining a downwardly facing recess that extends above the lower surfaces of the screens for trapping debris carried by the wastewater; and an effluent discharge passage in fluid communication with the second portion of the container; wherein during a sufficient rain event, the wastewater flows from the sewer system into the upper end of the container first portion, through the container first and second portions and the screen arrangement, and then into the effluent discharge passage, such that the wastewater flows generally in a first direction through the first portion of the container, then generally in a second direction different than the first direction through the second portion of the container, and wherein the treating agent dispenser operates to introduce the treating agent into the wastewater such that the treating agent has sufficient contact time with the wastewater to at least partially disinfect the wastewater during the rain event.