According to our early understanding of the fecal treatment in some large and medium-sized cities across the country, we make the following analysis of the existing situation and problems for reference:

(1) The feces that have not been treated in any way are concentrated in the city/suburb junction or the suburbs of the city, resulting in the breeding of mosquitoes and flies, the exile of infectious bacteria, and the spread of diseases. During the discharge of feces, a large number of harmful gases such as hydrogen sulfide, ammonia and nitrogen are directly discharged into the air, which forms secondary pollution to the air and seriously affects the lives and health of nearby residents.

(2) The feces are directly discharged into the sewage treatment plant through the municipal pipe network. Although this method eliminates the link of feces treatment, it increases the treatment load of the sewage treatment plant, shortens the service life of the equipment, and affects the treatment effect.

(3) In the process of direct discharge of feces, a large amount of inorganic salts in feces will gradually precipitate, mixed with many solidified substances. Long term sedimentation and accumulation, combined with slow sewage flow, will lead to siltation and blockage of the pipeline. It will affect the smooth discharge of fecal sewage and wastewater.

(4) A large number of septic tanks lost their inspection and management, which led to the failure of timely treatment of feces, resulting in the outflow of fecal water, which had a bad impact on people's living environment and health, and the public was full of complaints.

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