1. Vastuu Shastra Says :

• A septic tank should be placed in such a way that it doesn’t face directions like South-east, South-west, and North-east.
• The ideal location for a septic tank is North-west.
• The segregation of the septic tank should be in a way that the water goes to the eastern side while excretion waste goes to the western side.
• Vastuu tells us to make the length of the septic tank in the East-West side while the breadth in the South-North.
• It should always be constructed to the ground level and must not touch the main wall of the house i.e. compound wall.
• Make sure the drainage pipes in the toilet and bathroom have their passage in the West or North-west. While to the contrary kitchen pipes should have their passage in the East or North.
• Avoid drainage pipes in the Southern portion of the house and if it has been made then ensure that their passage should be made in the East or North.
• The main sewage can be located in the North, East, or West but avoided in the South 

Another Thinking:

• Septic tank must never face north east, south-east, or south west corner.
• It should not directly touch the compound wall. In fact the tank must be at least two feet away from the wall.
• If space is scarce, the tank must be in the northern corner of the west. However, make sure that the tank is at least two feet away from the wall of your compound.
• As per Vastuu for a septic tank, the length of the tank must be in the east-west, while the breadth should be in the south-north.
• Never construct the tank higher than the level of the house. The best is to build it on the ground floor.
• The outlet of such tanks must be in the west or north.
• If we divide the northern side into nine parts, the tank must fall in the third part from north-west.
• The septic tank has three parts. Preferably, water must be in the eastern part and the outlet for excretion must be in the west.

Things To Keep in Mind

• You should never have outlets in the south. However, in case the vent is in the southern direction it must be turned to north or east.
• Bathroom and kitchen pipes must have their outlets in the north or east direction.
• The bathroom pipes and toilet pipes must be diverted to the northwest or west direction.
• The gutter can be in any other direction except for south.
•  Pipes that come from the upper floor must never be in the southwest corner.

What is the Science:

• Highly efficient oxygen-loving Aerobic bacteria reduce wastewater strength more than 90% in the septic tank. Therefore, the drain field must perform only 10% or less of the water cleansing.
• The inefficient oxygen-hating anaerobic bacteria in a standard septic tank reduces the wastewater strength only 30% – 40%. Therefore, the drain field must perform 60% – 70% of the water cleansing.
• Converting your septic tank to energetic oxygen-loving bacteria with the Aero-Stream product reduces the workload on your drain field allowing it to recover.
• Oxygen-loving bacteria dramatically improve the quality of wastewater leaving a septic tank versus standard oxygen-hating bacteria.
• Oxygen-hating bacteria in a standard septic tank produce a rotten egg-like odor.
• Oxygen-loving bacteria tanks have only an earthy musty sent-like topsoil.
• Oxygen-hating bacteria systems produce corrosive hydrogen sulfide gas that deteriorates metal and concrete tanks and distribution boxes. 

Background Information

Incoming sewage or influent arrives in the septic tank containing both oxygen-loving and oxygen-hating bacteria. It is important to understand the following:

      Aerobic Bacteria needs oxygen to live.

Anaerobic Bacteria do not need oxygen to live.

A very important function of the septic tank is to allow bacteria to convert organic material into energy the bacteria then uses for its life functions.

This conversion is what breaks down the organic solids in the wastewater into simpler solids and gas, making the wastewater leaving the septic tank comparatively cleaner than what comes into it.

However, since most septic tanks do not contain oxygen, the oxygen-loving bacteria quickly die off, leaving the job of breaking down waste to the oxygen-hating bacteria. Consequently, most septic tanks contain only oxygen-hating bacteria.

Why Do Septic Tanks Produce Odor?

Oxygen-hating bacteria in standard septic tanks emit a rotten egg-like odor.

Concrete riser breaking down from the corrosive effects of an anaerobic septic tank

The odor is a characteristic of corrosive hydrogen sulfide gas, a byproduct of the oxygen hating bacteria.Both anaerobic and aerobic respiration processes need to have atoms or molecules willing to accept electrons to get the respiration processes started. Aerobic respiration uses oxygen, one of nature’s best electron acceptors.

Anaerobic respiration, however, must settle for less efficient options like sulfate(containing sulfur atoms). When the chemical reactions are completed, the odorous and corrosive hydrogen sulfide gas is eventually produced. If you need to replace your septic tank riser. 

Why Aerobic is Superior to Anaerobic

Converting an anaerobic septic tank to an aerobic one will save a failing septic system. This is because there is a huge difference in the ability of aerobic bacteria to breakdown organic material as compared to anaerobic bacteria:

aerobic bacteria will generate 20 times or more energy from the same amount of organic material than anaerobic bacteria.

aerobic bacteria will reproduce and consume organic material at an explosive rate as compared to anaerobic bacteria.

But Why the above position is perfect?  There is no answer.

So, take care from aerobic and anaerobic bacteria, sunlight, oxygen etc, this is the main funda of the Septic tank sludge decomposition. Size of the septic tank, free board, Inspection pit, slope of the floor, partition of the pit, notch and fluid flow slop also depending the age/maintenance period of the Septic tank.

Now your decision is the right answer for placing the perfect place of the septic tank as per Vastuu Shastra.