2, level 3 septic tank foundation should keep a certain clear distance from the adjacent original building foundation, and its value is generally not less than the height difference of the bottom surface of the adjacent foundation.
3, and lime line, set aside bricks when pay-off, and then dig a hole according to the line. When digging a pit, direct excavation should be adopted for plots with good soil quality, so that bricks can be laid close to the pit wall; For plots with poor soil quality or underground water, slope excavation with a certain slope must be adopted, and the backfill width should be not less than150 mm. The wall should be built according to the size of septic tank, and then plastered for waterproofing.
It should be noted that under the same width and depth, the length ratio of the three pools is 2: 1: 3.
4. The size of the box cover matches the tank body, and the thickness mainly depends on the ground position of the septic tank, generally 5cm. The outer edge of the can cover can be designed as an inner groove along the mouth.
5. The dung pipe has been installed and connected. A PVC pipe with a length of 65-75cm and an inner diameter of 15cm is used between the first and second tanks, and the included angle with the partition wall is 60 degrees. The second and third tanks are the same as the first and second tanks except that the length is 45-55cm. The distance from the manure outlet of the third pond to the top cover is about 20 cm.
6, sealing, the height of the cover is about 5cm.
7. The ideal way to treat manure is to fertilize farmland, but most farmers use chemical fertilizer instead. If you must take a dung truck to clean up, you'd better choose a place that is convenient for cars to get in and out. Generally speaking, it is cleaned once every two years.
Extended data
Function of septic tank
Septic tank is a basic sludge treatment facility and a pretreatment facility for domestic sewage. Its functions are as follows:
1. Ensure the environmental sanitation of the living quarters and avoid the spread of domestic sewage and pollutants in the living environment.
2. Kill mosquitoes and fly eggs in the anaerobic working environment of septic tanks.
3. Temporary storage of sludge, anaerobic corruption of organic sludge, and mature organic sludge can be used as agricultural fertilizer.
4. Pretreatment (primary treatment) of domestic sewage, which precipitates impurities and hydrolyzes macromolecular organic substances into small molecular organic substances such as acids and alcohols, thus improving the subsequent sewage treatment.
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