Plastic septic tank is a basic sludge treatment facility, it is also a pretreatment facility for domestic sewage. Its functions are shown in:
1. Ensure the environmental sanitation of the living community avoid the spread of domestic sewage pollutants in the living environment.
2. In the anaerobic decayed working environment of septic tanks, kill mosquitoes, flies eggs.
3. Temporary storage of sludge. Organic sludge undergoes anaerobic decomposition. The matured organic sludge can be used as agricultural fertilizer.
4. Pretreatment of domestic sewage (primary treatment), precipitation of impurities, hydrolysis of macromolecular organics into small molecular organics such as acids alcohols to improve subsequent sewage treatment.