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The WWS Process
Land Application Systems (LAS)


  1. Air Release & Check Valves
  2. Disc Filtration
  3. Control Valves
  4. Dripperline
Land Application Systems

    How It Works

The "Perc-Rite" system is a computer managed, drip disposal system. Computer management allows extremely accurate flow control and operator friendliness. By using pressure compensating dripper tube, even and controlled wastewater dispersal is achieved over the entire disposal area. This overview of the "Perc-Rite" system will present general system capabilities, as well as the site-specific options that are available.

Combining state of the art computer controls with pressure compensating drip tubing provides an unmatched level of flow control. The "Perc-Rite" unit measures the effluent flow to the fraction of a gallon if required. It is this flow measurement, which is monitored by the computer that ensures each absorption area receives the design flow of effluent. Once the effluent is measured and leaves the unit, the pressure compensating drip tubing will disperse it evenly over the entire area.

The "Perc-Rite" unit is controlled via a state of the art controller and a pressure switch located on the main influent line. The system is dosed on time, and the designed flow is distributed evenly over a twenty-four hour period.

The system can be run by either elapsed time or real time in either event when it is time to start a dosing cycle the system checks to see that there are no system failures, and also checks the status of the pressure switch to verify there is enough effluent pressure to complete a dosing and a flush cycle. If any of the checks fail the system remains idle until the next time to start. If all checks are o.k. The system will start a dose to the current zone selected, and check the status of the zone to see if it is time to flush the zone. If no flush is required the system will disperse the programmed dose to the zone while monitoring flow, if necessary the system will backwash the filters during this process. After the completion of the dose the system will shut down by closing the field valve(s) but the safety valve may continue to be open for a preset time to ensure the proper closure of the field valve(s). This time is set by the factory at system startup if needed. The process is repeated on the next start time. If it is time to flush the field the system will complete the normal dosing cycle and then the field flush cycle on the zone.

The filtration package provided with the "Perc-Rite" unit is unmatched. The Disc filters are matched with automatic backwashing to protect the drip tubing from clogging by particles from the dosing vessel. The backwashing of the filters can be initiated in two ways. First, backwashing can be initiated by total flow discharged through the system. The number of gallons, which will start a backwash cycle, can be customized to meet any sites needs. The second backwash triggering mechanism is a differential pressure switch. This switch acts as a fail-safe to ensure proper effluent filtration. The switch will measure differential pressure across the filter bank. When the pressure differential reaches a preset point the controller is told to start a backwash cycle regardless of flow through the system. This feature guarantees proper effluent filtration and flow even during periods of less than desirable pretreatment conditions.

When the backwash cycle is triggered, the master valve closes allowing maximum pressure for backwashing. Then one filter valve changes states, thus taking the filter offline and blocking the flow of unfiltered effluent to the filter. Effluent is then filtered through the remaining filters and fed in reverse through the offline filter, thus causing the filter to spin clean and discharge the remains out the backwash line. After a short delay the process will be completed on each remaining filter. The whole process can be completed in about 25 seconds per filter with no reserve backwash water required.

Automatic drip field flushing is another feature unique to the "Perc-Rite" system. This flushing allows the tubing to be scoured free of any buildup that might hinder performance. By cleaning the tubing, pipe, and manifolds, emitter clogging is eliminated. Thus the drip tubing will continue to deliver precise and accurate doses to the absorption area. The dripper lines are automatically set to flush after every 16 days of system operation. If any fields are not in operation they will still be set to flush after 16 days and they will flush the next time they are dosed. This function is activated by the controller which opens the field flush valve, thus allowing the flushed effluent to be returned to the pretreatment tank. The duration of this cycle is approximately five minutes per drip zone section. The flushing action creates a high effluent velocity, which produces a cleaning action over the inside walls of the drip tubing and emitters.

The "Perc-Rite" effluent disposal system integrates data logging and on-site monitoring with the operation of the system to produce unmatched system control, operator friendliness, and environmental safety.

The data regarding flows can be opened into a spreadsheet to aid in recording. The operator will be able to download the days flows, as well as monthly flows from as far back as three months for daily flows, and 30 months for monthly flows. This aids large systems in complying with rules that require an accurate record of daily flows.

Remote monitoring of the system is accomplished by the installation of remote monitoring software installed on the "Perc-Rite" system computer, which allows the manufacturer to remotely control the system from anywhere a phone line is present. Operators may also wish to purchase and install the software on home or office PC's to allow remote access for retrieval log files or to check the status of the system.

In addition to simply monitoring these functions the unit can also control itself based on the data received. For example, if a line is broken and a zone is flowing freely, the unit will record the flow variance. If the flow variance is significant enough, not only will the condition be recorded, but the zone can be automatically taken off line to prevent further environmental contamination. The overall system will continue to run to allow for wastewater disposal in the unaffected zones while awaiting repair of the affected zone. The monitoring also records the zone, time, and date for each variance. This is an Invaluable aid in maintenance and troubleshooting.

Along with the capability to enable or disable zones via the controller, the system can also incorporate moisture sensors in the disposal fields to prevent over saturation to any individual field. If it is not important to control the fields individually, but the overall disposal area must be monitored the system has an auxiliary input which may be attached to external devices such as a rain gauge. This input will stop the system from disposing of effluent until the event has cleared.

* Perc-Rite, Dose-Rite and Spray-Rite are Registered Trademarks® protected under U.S. Patents 5,200,065 5,984,574


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