Black Odor Water Treatment System Design And Related Experimental Research

The black and odorous water body not only damages the human settlement environment,but also seriously affects the image of the town,and its effective treatment in recent years has attracted great attention from government departments at all levels.In view of the inadequacy of the existing black and odor water treatment system,the insufficient compaction of the treatment device,and the poor treatment effect,the paper presents the process flow of the new black and odor water treatment system,which is mainly based on the emerging cyclone floating treatment technology.The front end is coupled with chemical coagulation treatment technology,while exerting the synergistic effect of cyclone floatation and ozone oxidation treatment.The thesis first carried out laboratory experiments on chemical coagulation treatment,and successively determined the best coagulation agent type and dosage concentration.When the coagulation treatment effect reached the optimal type,the oil removal efficiency was 93.4%,and the turbidity removal rate was 88.9%..Afterwards,an indoor experimental study of ozone oxidation treatment was conducted.Through the indoor ozone oxidation treatment experimental study,the optimal dosage of ozone and the optimal oxidation time were obtained.At this time,the COD removal rate of sewage was 84.4%,and the ammonia nitrogen removal rate was 53.1%.The special cyclone floatation treatment device for the treatment of black and odorous water is mainly composed of vertical cyclone floatation tank and fine bubble generation equipment.In this paper,first,the process design calculation,computational fluid dynamics(CFD)numerical simulation calculation and other means are used to complete the treatment capacity of 1m3/h The structure design of the vertical cyclone floating tank,and the use of the existing tubular micro-bubble generator of the research group were carried out for indoor experimental research.Because the existing tube-type micro-bubble generator has the problem of losing the volume compactness under the large processing capacity,the paper designs and develops a high-throughput pressurized dissolved gas-type micro-bubble generator.The high-flux pressurized dissolved gas micro-bubble generator is mainly composed of a pressurized dissolved gas tank and an internal gas-liquid mixing section.By establishing an effective CFD numerical simulation model,the paper takes the dissolved oxygen concentration at the bottom water outlet as an evaluation index.The structure optimization design of the gas-liquid mixing section was carried out.After the optimization,the dissolved oxygen concentration at the bottom was increased to 29.21 mg/L.The relevant work of the thesis is a solid foundation for the independent research and development of high-performance large-volume pressurized dissolved gas micro-bubble generators,which provides reference guidance for the implementation of efficient and compact treatment processes for black and odorous water bodies.