Encyclopedia of Environmental Science and Engineering, Volume I and II

1084 SMALL FLOW WASTEWATER TREATMENT TECHNOLOGY FOR DOMESTIC AND SPECIAL APPLICATIONS

FIGURE 1

Typical design of septic tank and intermittent filter. (Adapted from Ref. 2.)

AccessManholes

Sanitary

Te e

Inlet

Vent

Liquid Level

Outlet

Graded Gravel 3/4

" to 2

1/2

"

Graded Gravel 1/4

" to 1

1/2

"

Marsh Hay orDrainage Fabric

Top Soil FillDrainage

Filter Media

Peforated or OpenJoint Distributors

Perforated or OpenJoint Pipe, TarpaperOver Open Joints

> 8 in > 8 in

24–36 in

> 6 in

6 "

Distribution Box

House Sewer

SepticTa n k

Vent Pipe

A A

Vent Pipe

Discharge

Inspection Manhole

and DisinfectionContact Tank

(If Required)

Profile

Plan

Section A-A

Longitudinal Section

(a) Typical design of two-compartment

septic tank

(b) Typical design of buried intermittent

filter installation

PeaGravel

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