The Study Of Overflow Law Of H₂S Spilled Out In Sewers

With development about economy, the urbanization process becomes faster than several years ago, and the scale of the urban sewage drainage system expands increasingly. Urban centralized sewage treatment requires huge sewage drainage network to collect and convey sewage, which makes the line of urban sewage drains continuously extended, long sewage pipeline plays the function of biochemical reactions, the dissolved oxygen and nitrate in wastewater was completely consumed with water residence time in the pipeline lengthened, Gradually formed in the anaerobic environment causing microbes and sewage pipes in the bottom sediments of generating hydrogen sulfide and other toxic gases in the pipeline. Hydrogen sulfide is not only a certain strength of toxic substances, and is typical of the odor source; hydrogen sulfide gas generated in the pipeline caused a sustained discharge pipeline corrosion, while posing a hazard to human health.In order to control the urban sewage caused by H2S produced from anaerobic microorganism in sewers, measurement should be made firstly, and the characteristics of H2S produced in sewers should be understood. In this study, taking into account H2S proportion may also be very different between with urban areas sewage water quality, quantity and other factors, the drainage system of city life in accordance with its different functions vulcanized partition, it generates research hydrogen spillover rule. In this paper, for example in drainage system of Lanzhou University of Technology. The concentration of H2S in field manhole including residential, cultural and educational areas, general area and mess hall was monitored. The main research contents and conclusions are as follows:(1) After experimental study, typical urban sewage drainage system law of H2S gas production line is as follows:H2S gas production line has the inherent nature, reflected in the water height and slack period in one day, within a week in the peak period of time, water production line of various characteristics of the exhaust gas to be significantly higher than the water resources time.(2) Due to geographical factors, eating habits, etc. to make the water quality and quantity of the various functional areas are different, the water quality of the selected region in this experiment showed a weak alkaline, and has a significant amount of daily sewage discharge period, leading to the district drainage system H2S gas production row of significantly different, the residential area has the largest and most peak overflow concentration of H2S, other functional areas have few peak and low concentrations.(3) H2S production line of law have obvious change all the year round, because of the difference of water displacement and temperature all the year round, result in spring, summer, autumn and winter H2S production change, the temperature difference is sewage drainage system in one reason for the difference between the characteristics of the exhaust gas production line, whether it’s on the weekend or working days, sewage drainage system in H2S distribution in summer than in other seasons. Each functional area sewage discharge waste gas drainage system was evidently influenced by season.(4) In the same season, whether it is on the weekends or weekdays, distributing the amount of H2S gas of residential is higher than other functional areas, and presented the law: residential> mess hall> general area> cultural and educational areas in spring and summer, presented the law:residential> general area> cultural and educational areas> mess hall in autumn and winter.(5) The same functional areas, in different seasons, distributing the amount of H2S gas in the summer is higher than in other seasons, and presented the law:summer> spring> autumn> winter.