What are Septic Permits?

Tertiary septic tank is a type of septic tank. From the middle of the first-stage pool, the pipe is turned into the next-stage pool for secondary purification, and then the manure water after the second purification is re-introduced to the next stage for purification, so that after three purifications, it is completely turned into water Only then can it flow into the sewer to be led to the sewage treatment plant and finally into the river.

First , through the toilet directly into the pool for digestion , this pool is called the first-level pool.

Second , from the middle of the first-stage pool to the next-stage pool through the pipe turning up to the secondary purification

Third , the second-purified faecal water is re-introduced to the next level and purified again , so that after three purifications, it has been completely turned into water before flowing into the sewer to the sewage treatment plant and finally flowing into the river. The septic tank is composed of three connected ponds, and the middle is connected by a septic tube. It mainly uses the principle of anaerobic fermentation, middle-layer dung and parasite eggs that have a larger specific gravity than the general mixed liquid and are easy to settle. The above fermentation decomposes, and the middle layer of fecal fluid flows from 1 to 3 ponds in order to achieve the purpose of precipitating or killing parasite eggs and intestinal pathogens in the feces.

Fresh feces enter the first pond from the entrance of the feces. The feces in the pond begin to ferment and decompose. Due to different specific gravity, the feces can be naturally divided into three layers. Of fecal fluid. The upper layer and the lower layer of dung contain the most bacteria and parasite eggs, and the middle layer contains the least eggs. The preliminary fermented middle layer septic fluid overflows through the dung pipe to the second tank, and most of the under-fermented manure And the dung remains in the first tank to continue fermentation. The fecal fluid flowing into the second tank was further fermented and decomposed, the eggs continued to sink, the pathogens gradually died, the fecal fluid was further harmless, and the fecal skin and thickness of the feces were significantly reduced compared with the first tank. The fecal fluid flowing into the third pond has generally been decomposed, and the germs and parasite eggs have basically been killed. The function of the third tank is mainly to store the basically harmless fecal fluid ^[2]

The underground part of the structure of the tertiary septic tank is composed of a toilet, an inlet pipe, a passing pipe, a tertiary septic tank and a cover plate.

Three-stage septic tank

Processed and manufactured by the factory or self-prefabricated. The toilet is straight-through and connected to the manure pipe. It can also use a water-sealed toilet and no longer need to be installed in the manure pipe.

Three-stage septic tank inlet pipe

Plastic, cast iron, and cement pipes are available. The inner wall is smooth to prevent scumming. The inner diameter is 10cm and the length is 30-50cm.

Tertiary septic tank

Plastic pipes are preferred, with a diameter of 10-15cm. The length of faecal tubes between 1-2 tanks is about 70-75cm, and the length of faeces between 2-3 tanks is about 50-55Cm.

Tertiary septic tank

Brick wall or cement cast-in-place can be used for prefabrication. The "mesh" shape is the main type. If the terrain is restricted, the "pin" shape and "D" shape pendulum are also available. It is advisable that the volume should reach 2 months. The effective depth of the three-stage pool should be no less than 1m, and the volume ratio of the first to third stage is generally 2: 1: 3.

Three-stage septic tank cover

It can be prefabricated by itself, which must be sealed, and it is easy to remove residue and excrement