The sterilization and disinfection principle of three-cell septic tank

The sterilization and disinfection process of rural three-cell septic tank is roughly divided into four steps: filtration precipitation, anaerobic fermentation, solid decomposition and excretion.

Our domestic sewage, first of all, flows into the first grid of the plastic septic tank. In the first cell, feces, parasite eggs and other things settle down and begin the initial fermentation decomposition. The waste water after fermentation and decomposition is divided into three layers: scum layer, relatively clear feces liquid, solid feces sludge layer.

The feces then flow into the second cell, scum floats on top, and sludge is deposited on the bottom, remaining in the first tank for further fermentation. In the second cell, the feces continued to ferment and decompose, the eggs continued to sink, the pathogens gradually died, the feces became more harmless, and the thickness of scum and sludge decreased significantly compared with the first cell.

Finally, the stool that enters the third compartment is usually mature, where the pathogens and parasite eggs have essentially been killed. The third function is to temporarily store mostly harmless feces. In this way, after three dehydrations, it can enter the sewer, enter the sewage treatment plant, and finally enter the river.

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