Structural and sewage characteristics of practical rural sewage collection systems in underdeveloped mountainous areas

Rural sewage collection systems are important parts of rural sewage engineering and the conditions in underdeveloped mountainous areas are not conducive to the construction and operation of conventional rural sewage collection systems. This study investigated and analyzed the practical rural sewage collection system in an underdeveloped mountainous area, and found that the diameters of the public rural sewers in the region were mostly DN300 and DN500, the relative depth was generally <0.3, and the frequency of siltation was 6 %. The concentration of chemical oxygen demand (COD), suspended solids (SS) and ammonia nitrogen in the rural sewage collection system was relatively high, and the pollution degree of the sewage could be reflected through the conductivity, turbidity, dissolved oxygen and oxidation reduction potential, so as to realize the rapid monitoring of the rural sewage characteristics and ensure the normal operation of the terminal treatment facilities. The removal capacity of COD and SS in sewers and ditches was different. It is suggested to strengthen the operation and maintenance of the collection system, optimize the design parameters of the collection system and evaluate the concentration of influent pollutants in the treatment facilities to improve the effectiveness of rural sewage treatment.