Question

The figure below shows the various phases of work that are required to implement a Pressure Sewerage System (PSS) in a new residence that is being built. Produce a Summary of Work (based on Australian Standards) that will be required to complete each of the three phases of the sewerage reticulation scheme as depicted in the figure. Alarm/control n el R eticulation Main Switchboard : W et Well & pump B oundary Kit Work involving Pressure Sewer System and Control Panel (Phase 2) Reticulation Work (Phase 3) Work in the Private Property (Phase 1)

Answer 1

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Solution :

A Pressure Sewer is. . . A sanitary sewer system that utilizes a network of grinder pumps to transport wastewater through small diameter pipes to a collection and treatment system. A grinder pump is a submersible pump designed to reduce wastewater particulate to a slurry through the use of a grinding mechanism . Wastewater Treatment Plant Service Connection Lateral Road Pressure Sewer Collection System Typical lakefront pressure sewer system

How big is it? Systems can be as small as a single station pumping into an existing gravity sewer line Systems can be as large as thousands of stations tied together with a piping network stretching for miles before discharging to a collection point

Pressure Sewers provide... An economical solution to geo-technically challenging environmental conditions where gravity sewers may be impractical if not impossible . Examples include: Rocky soil Hilly terrain Shallow bedrock Waste System Pumps Up Hill High water tables Long flat terrain Slow growth areas Existing structures 211 and roads Shallow bedrock

Typical residential installation A grinder pump station is located in the yard or basement of each home .Wastewater flows into the station from the building's sewer line (typically 4") .The basin contains a grinder pump, level sensors, valves and discharge piping

Typical residential installation BUILDING COVER CONTROL PANEL OR ALARM BOX GRINDER PUMP STATION CONDUIT VENT SHUT-OFF VALVE LIFTING CABLE BASIN TOP APPROX. 2" SEWAGE BASIN BACKFILL ABOVE GRADE BOX SERVICE CONNECTION BUILDING SEWER PRESSURE SEWER COLLECTION LINE SHUT-OFF VALVE (USED FOR ISOLATION) JUNCTION BOX REDUNDANT PUMP CHECK VALVE CONCRETE BALLAST (F REQUIRED) SERVICE CONNECTION LATERAL INTEGRAL ANTI-FLOATATION COLLAR COMPACTED SUBBASE CHECK VALVE GUIDE RAILS LEVEL SENSORS GUIDE RAIL SYSTEM

Typical residential Grinder Pump site components A pressure sewer collection line is laid along the edge of the roadway, following the contour of the land The pressure sewer collection line delivers the wastewater to a central treatment system manhole, or force main .Wastewater may be transported several thousand feet to a discharge point at a higher elevation

Residential Grinder Pump Packages - 2 styles Pump Control and/or Alarm Panel Basin Piping / Valves Level Sensors _Grinder Pump Maior Components

Grinder Pump A submersible pump designed to reduce wastewater particulate to a slurry through the use of a grinding mechanism Typical Types Progressing Cavity (1- 2 HP) - Centrifugal (2- 15 HP) Discharge Size - 1-1/4" to 3"

Pump hydraulics 【n 140 2 HP CENTRIFUGAL GRADER Pup 40130 1 iP PROGRESSNG CAVITY GRIDER PP Typical residential performance curves 120 110 32 100 A - Centrifugal B - Progressing Cavity 2480 70 60 1650 40 30 10 0 5 10 15 20 25 30 35 40 45 50 U.S. GALLONS LITERS 80 FLOW PER MINUTE

Basin The basin* is a watertight holding tank located below grade. High Density Polyethylene (HDPE) and fiberglass are the most common basin materials .Basins are equipped with an ant flotation collar, preventing them from floating out of position if the ground water table rises For additional information see the SWPA's Basin Reference Guide

Pump control alarm panel A lockable, weatherproof enclosure Disconnect and circuit protection Motor contactor with optional overload protection Selector switches / Pilot lights . High water alarm . Thermal protection Pump, power, and float terminal blocks

Station operating sequence Wastewater flows from the house to the pump basin via gravity Once wastewater fills the basin to a predetermined point, the level sensor signals the pump to turn on The grinder pump grinds the wastewater into a slurry and pumps it out the small diameter pipeline to the collection svstem Once the wastewater level in the basin Pu lowers to a predetermined point, the level sensor signals the pump to turn off On Pum "Off"

Station operating sequence . If the pump does not operate when signaled by the wastewater level sensor the sewage level continues to rise, activating a high water alarm Pump "Alarm" Pump "On" . The high water alarm is normally an audible and/or visual alarm and may be a remotely monitored signal Pump "Off" Alarm Light

Typical commercial statiorn Larger pump station basin for added storage capacity . .Two submersible grinder pumps to provide redundancy . The control panel will include an alarm and an alternator to run each pump every other cycle Caution: Code requirements may be more stringent for commercial stations than for residential stations.

Operating costs Operating costs for a typical residential station can be less than $3.00 per month* Based on 10 cents per Kilowatt Hour and 300 Gallons per day Il

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