Wastewater lagoon aeration treatment system

摘要

A novel lagoon aeration treatment system is provided which can be used with existing or new wastewater lagoons to increase the lagoon's treatment efficiency and capacity, and to allow for a continuous, year round discharge of treated wastewater to the environment. The system can be operated in warm and cold climates for treatment of municipal and industrial wastewaters of varying strength and flow rates in a secondary activated sludge treatment process, a tertiary activated sludge treatment process, or an extended aeration treatment process. The system employs an outside aeration system consisting of a wastewater pump and an air aspirator-mixer to provide wastewater aeration outside the lagoon and a pipe system placed inside the lagoon to provide a recirculation of aerated and non-aerated wastewater and sludge between the lagoon and the outside aeration system for re-aeration and return to the lagoon in a continuous or interment manner to accomplish a desired treatment level and efficiency and operating costs.

主权项

1. A Wastewater Lagoon Aeration Treatment System comprising:
a primary settling cell, an anoxic tank, an aeration system, a sludge return cell, a clarification (secondary settling) cell, control valves; said primary settling cell of an existing or a new lagoon comprises a raw wastewater pipe inlet, single or multiple and an outlet pipe located on the opposite side of said raw wastewater pipe inlet in said primary settling cell, and said outlet pipe is fluidly connected to said anoxic tank; said anoxic tank comprises two compartments; raw wastewater and activated sludge mixing compartment (upstream compartment) and return aerated wastewater and the raw wastewater and activated sludge mixture mixing compartment (downstream compartment); said aeration system is provided for aeration of wastewater outside a lagoon and it comprises an aeration pump, an air aspirator-mixer and an aeration tank, and which are fluidly connected, and said aeration system is fluidly connected to said anoxic tank and to said sludge return cell; said sludge return cell comprises an inlet pipe and an outlet pipe and is provided for settling of a portion of activated sludge and for return of the activated sludge and aerated wastewater to said aeration system located outside a lagoon comprising said sludge return cell, said clarification cell and said primary settling cell; said clarification cell is provided for final clarification of partially settled, aerated and treated wastewater which flows from said sludge return cell and for discharging of the clarified wastewater to a storage cell or directly to the environment through an outlet pipe; said control valves comprise a first control valve located on the outlet pipe of said primary settling cell upstream of said anoxic tank upstream compartment, a second control valve located on the outlet pipe of said sludge return cell upstream of said anoxic tank upstream compartment, and a third control valve located on a pipe which fluidly connects said aeration tank with said anoxic tank downstream compartment, wherein said first, second and third control valves are provided for optimization of settled raw wastewater and return activated sludge flow rates through said aeration system, proportioning of the ratio of the return activated sludge to the raw wastewater flow rates and operation of said aeration system within specified wastewater levels in said primary settling cell in order to use said primary settling cell as a daily flow or longer balancing cell, and for control of aerated wastewater recirculation from said aeration tank to said anoxic tank downstream compartment.