The fermentation process of FRP septic tank can be divided into filtration sedimentation - Anaerobic Fermentation - solid decomposition - excrement discharge.
Generally speaking, we divide a large FRP septic tank into three or four compartments. Three compartments are called three-level septic tank and four are called four-level septic tank.
Sewage is first discharged from the water intake to the first tank. Solids and parasite eggs with a larger proportion in the first grid are precipitated, and initial fermentation decomposition is started. The fiberglass reinforced plastic septic tank contains the most bacteria and parasite eggs in the upper layer of excrement and the lower layer of excrement, while the middle layer contains the least worm eggs. The middle layer of the initial fermentation overflows to the second tank through the excrement tube, and most of the excrement is not fully fermented. Fecal skins and residues were blocked in the first pond to continue fermentation. The feces flowed into the second pool were further fermented and decomposed, the eggs continued to sink, the pathogens gradually died, and the feces were further harmless, resulting in a significantly reduced thickness of the feces and the feces than in the first pool. The wastewater treated in the first case can be divided into three layers: pasty dung, relatively clarified dung and solid dung residue.
After the initial decomposition, the excrement flows into the second compartment, while the floating excrement and the sediment deposited below remain in the first compartment and continue to ferment. In the second case, the feces continued to ferment and decompose, the eggs continued to sink, the pathogens gradually died, the feces were further harmless, and the thickness of the feces and residues produced was significantly lower than that in the first case.
The feces flowing into the third compartment are generally ripe, and pathogens and parasite eggs have been basically killed. The third function is mainly to temporarily store the basically harmless excrement.