The effluents from the septic tank are discharged into

Explanation:

Septic tank: 

• A Septic tank may be defined as primary sedimentation tank with longer detention period of 24 hour to 48 hour in comparison to 2 to 2.5 hour of PST.

• Effluent from septic tank are discharged into  (1) Soak Pit   (2) Dispersion Trench 

​Soak Pit:

• Soak pit is a circular cover pit through which effluent is allowed to be soaked or absorbed into the surrounding soil.
• It may be either filled with stones or may be empty.

• It is used when percolation rate is less than 30 minutes.

Dispersion Trench:

• In this effluent is allowed to enter  into a masonry chamber called dispersion box.
• From dispersion box effluent is uniformly distributed through an underground network of open jointed pipes into absorption trenches, called dispersion trench.

• It is used when percolation rate is in the range of 30 to 60 minutes.