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AdvanTex Orenco Systems, Inc.

Description of Technology

Descriptions for proprietary technologies are from the Massachusetts DEP Approval Letters for the technology.

The System is a Secondary Treatment Unit (STU) that provides an aerobic treatment process. The System is a multi-pass (recirculating), packed bed aerobic wastewater treatment system designed to treat residential strength wastewater from facilities with a design flow of less than 10,000 gpd.

AdvanTex AX-RT Series (AX20-RT and AX25-RT)

The AX-RT consists of an 800 gallon two-chamber fiberglass reinforced polyester (FRP) recirculating treatment tank, preceded by a separate septic tank with effluent filter. The engineered textile media is suspended from the top of the treatment tank with a portion of the media positioned over the first compartment (the recirc/blend chamber). The remainder of the media is position over the second compartment (the recirc/filtrate chamber) from which filtrate (treated effluent) is discharged. The two chambers are separated by a baffle wall. A recirculating pump draws water from the first compartment of the recirculating tank, and sprays it onto the top surface of the textile media at regular timed intervals to achieve a recirculation ratio of between 3:1 to 5:1. Filtrate drains from the textile media back into the two chambers. Timer settings can be adjusted if actual flows vary significantly from projected flows.

The baffle wall between the chambers is fitted with a recirc-return valve for equalization during low-flow periods. Under low daily flow conditions, the valve allows 100% of the filtrate to be returned to the recirc/blend chamber for continued recirculation.

The recirc-return valve is similar to a check valve in that it allows preferential flow in one direction only — in this case, from the recirc/filtrate chamber to the recirc/blend chamber. The recirc-return valve closes when the liquid head on the recirc/blend side is equal to or greater than the liquid head on the recirc/filtrate side. When the liquid head on the recirc/filtrate side is higher, the pressure differential pushes the recirc return valve open for filtrate to pass back to the recirc/blend side of the baffle, thus providing for continued recirculation during periods of low or no inflow. Flow from the recirc/blend chamber can pass to the recirc/filtrate chamber only through the treatment media.

 AdvanTex AX20 and AX100

The System includes a pre-assembled, UV-protected fiberglass reinforced polyester module (“filter pod”) that contains the textile media. The filter modules are equipped with UV protected, removable fiberglass reinforced polyester lids and contain one inch of insulation on the underside of the lid. Except where separate septic and recirculating tanks are required per Special Condition 4 below, an AX20 filter module is typically installed on top of a two compartment processing tank with a minimum capacity of 1500 gallons. Raw sewage enters the twocompartment Processing Tank through its inlet tee. In the first compartment, the raw sewage separates into three distinct zones: a scum layer, a clear layer, and a sludge layer. Flow-through ports in the tank’s baffle wall allow effluent from the clear layer to flow into the second compartment of the tank. The Biotube Pump Package in the second compartment pumps filtered effluent to a distribution manifold in the filter module. Effluent percolates down through the textile media and is collected in the bottom of the filter pod. The treated effluent flows out of the filter pod through the filtrate return line, which returns the treated effluent to the recirculating splitter valve (RSV). The RSV automatically splits or diverts the flow between the processing tank and the final discharge. The RSV also controls the liquid level within the processing tank. During extended periods of no flow, 100 percent of the treated filtrate effluent is returned to the processing tank. The recirculating pump vault is equipped with a removable filter cartridge that is equivalent to a septic tank effluent tee filter. In systems with separate septic and recirculating tanks, the pump vault is located in the second tank (the recirculating tank).

The effluent is applied at a preset recirculation ratio of between 3:1 to 5:1, controlled by a timer. Timer settings can be adjusted if actual flows vary significantly from projected flows.

In all AdvanTex systems, the recirculating pump controls are equipped with a high water level override and high water alarm. The alarm and control circuits are connected to an independent power source run from the main power source of the facility.

The System is equipped with a VeriComm control panel (CP) or equal which is connected via a telephone line or internet connection to the VeriComm monitoring system, providing continuous remote monitoring, maintenance information, management and control of each individual system. The CP provides the contracted operation and maintenance (O&M) provider with information to manage incoming alarms 24 hours per day through automatic notification, preestablished alarm protocols, an online list of all active alarms, online diagnostic data and online input and review of alarm responses. The CP also provides for site management through editable online information, an online tabular display of all operating data and provides standard and custom reports. The CP unit transmits report information to the O&M provider/Operator and the manufacturer of the System.

Massachusetts Technology Approvals

Approval Type General Remedial Provisional Pilot
Secondary Treatment
Nitrogen Removal Credit (Some Models)
Phosphorus Removal Credit

Please check the Title 5 Innovative/Alternative Technology Approval Letters webpage at Massachusetts DEP for the most up-to-date information.


Orenco Systems, Inc.
814 Airway Avenue
Sutherlin, Oregon 97479 United States
P: 800-348-9843
W: https://www.orenco.com/

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