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T he home wastewater treatment system is a step forward from the older septic tank system for wastewater treatment. It will provide a cleaner environment.

Home systems and small commercial systems are designed to handle waste treatment in areas that

cannot be serviced by city sewer systems. Without a home treatment system, many homes could notbe built in areas with very slow percolating soils, clay, rock or high water tables. Some of those condi-tions can allow effluent from a septic tank to move through the soil without treatment, polluting under-ground water supplies, ditches and streams. Home treatment systems can remedy those situations by

using the same treatment process used by large central treatment plants. They are simply treatmentplants down-sized to accommodate smaller requirements.

Basics of WastewaterTreatment Systems

Because of the high quality of effluent discharged from hometreatment systems, many alternate methods of disposal are now

possible. Some regulatory agencies allow direct discharge of theeffluent to streams, lakes, bays and other bodies of water. Inareas where this is not allowed, other methods are used such as

irrigation or drip irrigation for lawns, pastures, landscaped areasand golf courses. With additional accessories, recycled effluentcan be used for many other non-potable water uses.

When a stream or small river runs through rocks and over logs,turbulence is created. Oxygen is captured in the water.Aerobic bacteria utilize this oxygen to thrive and grow,

speeding up their digestive process allowing the stream topurify itself. In the same way, a wastewater treatmentsystem speeds up the aerobic bacteria process through

repeated aeration of the effluent. Air is brought in to thesystem by an air compressor. The air is diffused into thou-

sands of tiny bubbles. As these bubbles move through thewastewater, oxygen is captured and the purification process takes

place just like the stream. The air compressor is located outside thetreatment system for ease of service. This keeps the compressoraway from the corrosive environment and the potential problemof flooding.

Gast Compressor Optionsfor Home Treatment Systems

The Concept

Disposal Alternatives

Regenerative Blower

Linear Compressor

Rotary Vane Compressor

*This guide is written to familiarize general terms and system layout for home sewagetreatment systems. It is not intended for any design purposes. It should be noted that severalpneumatic technologies are used when supplying compressed air. In our experience, rotaryvane, regenerative blowers, and linear pumps have all been used as air sources. It is up tothe system installer to determine the air requirements and the Gast sales person to providethe pneumatic solution.

for the Home*

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How it WorksTo accomplish this aeration and purification, most systems use two separate compartments within a

single treatment tank. Effluent from the home will enter the aeration compartment of the system. In thisarea, thousands of tiny air bubbles provide oxygen for the aerobic digestion process and mixes thecompartments entire contents. These tiny bubbles quicken the aerobic digestion process. Aerobicbacteria then use the oxygen in the solution to break down the wastewater, converting it to an odorless

liquid.

Hydraulic displacement causes the liquid to enter the second compartment. Due to the sloping walls ofthe clarification compartment, any remaining solids will return to the aeration compartment for further

treatment and break down. The remaining clear effluent, then traveling through a filter, is added assur-ance that only a high quality, clear, odorless, effluent leaves the system. The effluent discharged from asystem has been highly treated and is normally colorless and odorless.

Compressor

Options

TERMS:

There are several terms that are referenced in discussing

wastewater treatment systems:

Flow Volume- is the hydraulic load or flow which is

referenced as GPD or Gallons per Day. A typical threebedroom home with four people will have an approximate

system flow volume of 360 GPD. Many factors contributeto flow volume such as flush toilets, sinks, showers,dishwashers and floor drains. Also to consider is the

condition of these areas. Do the faucets leak? Do thetoilets run? Is the homeowner conscious of water usage?

There are systems available from several manufacturers

as high as 1000 GPD and even 1500 GPD.

Waste Strength- The waste strength is referred to as thebiological load on the system. The primary parameters

used to measure the waste strength are: BiochemicalOxygen Demand or BOD, Total Suspended Solids or TSS

and Fats, Oils, and Greases or FOGs.

Registered Tradema rk/ Trad ema rk of Ga st Manufa cturing Inc.Co pyright Ga st Manufa cturing Inc. All rights res erved.

IDEX CORPORATION

Alarm Float

Inlet (From Trash Trap)

AirLine

Connection

SludgeDeflector

Outlet

Ground LevelAccess Cover

Air Drop LineAir Drop Line

Wastewater Treatment Unit

ClarificationCompartment

Filter

Aeration Area

AirDiffusers

GPD- Gallons Per Day

BOD- Biological Oxygen DemandTSS- Total Suspended Solids

FOGs- Fats, Oils, and Greases

For more information, contact us:

GAST MANUFACTURING, INC.A Unit of IDEX Corporation

PO Box 97, Benton Harbor, Michigan 49023-0097

Phone: 616-926-6171 Fax: 616-925-8288www.gastmfg.com

Regenerat i ve Bl ow er Perfo rmance

Pressures to 284 H2O (10.25 psig/707 mbar)

Air flow to 810 cfm (1376 m3/h)

Li near Performance

Pressures to 10.5 psig (0,72 bar)Air flow to 8.6 cfm (244 lpm)

Rotar y Vane Performance

Pressures to 25 psig (1,7 bar)Air flow to 112 cfm (190 m3/h)