How to do the size of 123 cells of the three format septic tank in the reconstruction of rural toilets?

(1) Volume of three compartment septic tank �� 1.5m3�� 1. The volume ratio of 2 and 3 tanks is 2:1:3 in principle; If the width of the second pool is less than 50cm, it can be increased to 50cm. The time of storing feces in the three compartment septic tank: the first tank is not less than 20d, the second tank is not less than 10d, and the volume of the third tank depends on the fertilizer cycle, which is generally not less than the sum of the first and second tanks.

(2) The depth of the three cell pool is the same, and should not be less than 1000mm. The baffle in the tank should be firmly and hermetically connected with the tank body in the form of slots to ensure that there is no leakage between the tanks inside the septic tank.

(3) Install a dung inlet pipe between the toilet and the three compartment septic tank. The inner wall of the pipe used for the dung inlet pipe should be smooth, with an inner diameter of �� 100mm, and it should be short and straight, and the angle with the ground should be greater than 15��. The outlet at the lower end of the dung inlet pipe should be about 50mm out of the wall of the first pool.

(4) The fecal pipe is used to closely connect the three compartment septic tank and ensure the smooth flow of fecal liquid.

(5) The inner diameter of the fecal pipe should be �� 100mm inner diameter smooth pipe, set in I or inverted L shape; The inlet of the fecal pipe connecting the first tank to the second tank should be at the lower third of the wall of the first tank, and the distance from the upper edge of the fecal pipe to the top of the tank should be less than or equal to 60mm. The inlet of the fecal pipe from the second tank to the third tank can be at the lower third or half of the wall of the second tank, and the overflow port is the fecal pipe from the same tank to the second tank. The fecal pipes from the first tank to the second tank and the fecal pipes from the second tank to the third tank can be installed alternately.

(6) The dung inlet is the channel connecting the outlet of the toilet to the septic tank, which can be directly built with cement bricks or connected with PVC plastic pipes with an inner diameter of 100mm. The septic tank is outdoors, the toilet is connected with the dung inlet pipe, and the fixed toilet is slightly sealed. If the first tank is indoors, and the straight through toilet is used, it is advisable to install a 45 degree plastic elbow or water bearing bend matching with the toilet, which can prevent the fecal water from splashing up and reduce the upward escape of a pool of odor. There must be a suitable slope during masonry and installation to facilitate the flow of feces. The installation position of the fecal inlet pipe and the fecal outlet pipe should be staggered and kept at a certain distance.

(7) The cover plate of the three cell pool must have the maintenance ports of the first, second and third cells, and should be sealed with a cover plate; The top edge of the first tank should be reserved for feces inlet, the top cover should be reserved for slag removal, the top cover of the second tank should be reserved for slag removal, and the top cover of the third tank should be reserved for feces outlet; The cover plate shall be made of glass fiber reinforced composite, cast iron and other anti-aging materials, and shall be equipped with locking device.

(8) The exhaust pipe shall be installed in the first pool, and the inner diameter of its circular pipe is �� 75mm, 500mm higher than the toilet house or, add rain proof (fly proof, wind proof) cap.

(9) Arrangement of three cell pool; Because the rectangular septic tank can prolong the precipitation time of feces in the tank, which is conducive to harmless treatment, it is generally used. There are other shapes, squares, circles, etc.