Patent ID: 8034238

Claim:
A wastewater treatment system for treating excess wastewater from a sewer system generated during a sufficient rain event, the wastewater treatment system comprising: a first storage chamber which is generally cylindrical and vertically aligned having an inlet adapted to receive excess wastewater directly from the sewer system, the first storage chamber having an upper end and a lower end, the upper end having an overflow outlet and the lower end having a return out outlet; a second and third storage chamber being vertically aligned and collectively forming a cylinder each having an upper end and an interconnected lower end, the upper end of the second storage chamber having an inlet adapted to receive wastewater from the overflow outlet of the first storage chamber, the upper end of the third storage chamber having an effluent discharge passage overflow outlet, and the lower end of at least one of the second and third storage chambers having a return out outlet; a treating agent dispenser for introducing a treating agent into the wastewater in at least one of the second and third storage chambers; at least one return pump having an inlet connected to the return out outlets and an outlet connected to the sewer system; and wherein during a sufficient rain event, the wastewater flows from the sewer system into the first storage chamber, if the first storage chamber becomes full wastewater overflows into the second storage chamber, such that the wastewater flows generally in a first downward direction through the second chamber, then generally in a upward direction through the third storage chamber, and wherein the treating agent has sufficient contact time with the wastewater to at least partially disinfect the wastewater prior to entering the effluent discharge passage, upon completion of the sufficient rain event any wastewater in the first, second and third storage chambers is returned to the sewer system via the return out outlets and said return pump.