The study of safeguard measures for the biological treatment of domestic sewage in low load along Qinghai-Tibet Railway

Considering the influent organic load of the sewage treatment stations along the Qinghai-Tibet line is less than half of the design value or even lower load condition, the study proceeds from process improvement and inoculating microorganism by adding porous flexible carriers and imported high-efficiency microorganisms to the biochemical reaction basin, turning continuous-flow into batch-flow, and shortening the aeration time of intermittent operation cycle. Through laboratory and field experiments, the program for the normal operation of the biological treatment along the Qinghai-Tibet Railway in low influent loading period has been got. The results show that imported high-efficiency microorganism can be used as vaccination microorganisms in the emergency situation; and efficient microorganisms combined with microbial immobilization technology can greatly enhance the effect of biochemical treatment and the ability of resistance to low influent loading; when the organic load was as low as 0.1kgCOD/m³·d around, operating intermittently with 12h as a cycle, aerating for 4h at least can achieve the highest COD removal rate, which can provide references for the operation and aeration time of the reactors in low organic load. The research result provides a technique to solving the practical sewage treatment problems along the Qinghai-Tibet line.