Put the following events of septic system operation in the correct order of occurrence:I. Household sewage is piped into septic tank. II. Wastewater containing suspended material flows into drain field. III. Purified wastewater percolates into groundwater or evaporates from soil. IV. Bacteria decompose organic material in well-aerated soil. V. Heavy particles settle out of water and bacteria decompose grease and oil.

The following events of septic system operation in the correct order of occurrence:

Household sewage is piped into septic tank.

Bacteria decompose organic material in well-aerated soil.

Wastewater containing suspended material flows into drain field.

Bacteria decompose organic material in well-aerated soil

Heavy particles settle out of water and bacteria decompose grease and oil.

Purified wastewater percolates into groundwater or evaporates from soil.

Explanation:

Septic tank system is underground in most houses and they are responsible for treating the waste material by anaerobic process.

The anaerobic bacteria present in the tank decomposes the waste material as faeces as:

A concrete or plastic tank is connected with water outlet and hoisehold sewage.

Waste water goes to first chamber of the tank.

The solid waste is acted upon by anaerobic bacteria.

The clear liquid after treatment gets train to septic field.

The impurities left in the water are imbibed by the soil and eventually by plants and by the process of transpiration enter the ground water.