The system operates by pumping a side stream of raw, unscreened wastewater through a conical shaped oxygen transfer reactor. The small sidestream pump pulls a portion of the main flow and overcomes the head loss through the cone to reintroduce the SuperOxygenated wastewater into the main line or body of water. Gaseous pure oxygen is metered into the cone which has an exceptionally large gas/water interface generated by the bubble swarm to achieve rapid SuperOxygenation.  The ECO2 SuperOxygenation system completely dissolves the gaseous oxygen into the wastewater before it is blended back into the receiving body.  There is no internal baffle matrix or static mixer that could collect rags or stringy material.

 

 

PLC Oxygen Flow Controls

The ECO2 system controls are composed of two separate panels, a process control panel and an oxygen flow panel. 

Process Control Panel

The process control panel is PLC driven, controlling the side stream pump and oxygen flow.  The ECO2 PLC monitors the force main water flow.  Based upon this flow, the PLC calculates an instantaneous Hydraulic Retention Time (HRT) of the waste water inside the force main which equates to an oxygen uptake rate of the force main. The PLC then adjusts the oxygen feed rate into the ECO2 system by means of the Oxygen Mass Flow Meter to match the oxygen uptake rate.
The PLC also monitors side stream pump operation, side stream water flow, oxygen flow, ECO2 system water pressure, and water temperature.  These parameters are checked against design inputs to ensure optimal system performance, system shutdown and alarm notification if operation is out of tolerance.
The process control panel consists of a NEMA rated stainless steel enclosure, PLC and panel view screen, side stream wastewater flow meter, temperature sensor and pressure sensor.
The process control panel has the capability to data log system performance, including the following parameters:

  • Force main flow
  • Side stream flow
  • Oxygen flow
  • ECO2 cone pressure
  • Wastewater temperature

 

 

Oxygen Control Panel

The oxygen flow controls serve to administer the correct amount of oxygen to the cone according to the parameters that are monitored and looped in the process system controls.  Based on the flow in the force main, the PLC will calculate a required oxygen demand and signals the mass flow controller located inside of the oxygen control panel to provide oxygen flow at the appropriate rate.  The mass flow controller provides a feedback signal of the mass of oxygen flowing at all times to the PLC. 

 

Side Stream Pump

A small side stream pump is used to pump a designed amount of water through the ECO2 SuperOxygenation Cone.  The side stream pump is a standard industrial wastewater pump and is typically 5-10 hp.  

  • Type and duty points of side stream pump are mutually determined by ECO2 , client's consulting engineer and client to suit system design and water quality.
  • Side stream pump is typically supplied by installation contractor selected by client.

 

 

Pure Oxygen Source

There are two main sources of oxygen used in conjunction with the ECO2 SuperOxygenation Cone – Liquid Oxygen (LOX) and onsite Oxygen Generation.
O2 Source Considerations

 

Liquid Oxygen (LOX)
Liquid oxygen is an industrial gas and is widely used for industrial and medical purposes. Liquid Oxygen can be supplied by a number of gas companies that will lease the equipment to their clients. The lease includes maintenance providing a hands-off solution for the customer. Generally, a bulk storage tank is located on site which is refilled as necessary by a liquid oxygen supplier.

 

Oxygen Generation
Oxygen generation is a mature technology that has been used for decades and is widely used for wastewater treatment, in medical facilities and manufacturing. Oxygen generators operate by passing an air stream through a molecular sieve which traps the nitrogen and discharges high purity oxygen for use. The nitrogen is then discharged into the atmosphere. Oxygen is generated upon demand and is stored in small quantities under ambient temperature and low pressure


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