The Study Of Treatment Mechenism And Thecnology For The Dying And Printing Wastewater

In order to improve the treatment efficiency of dying and print wastewater, a new idea and technology were introduced in this thesis, that are, based on the traditional treatment technologies, integrating the different functions into a comprehensive system by the process of the comprehensive tank plus reaction tank, At first, the dyes were categorized according to water affinity and hydrophobicity. the every two kinds of active dye,directive dye and acid dye among the affinity dyes were chosen to do distribution experiments, in order to obtain the optimism reaction condition and parameter, the experiments were done by using the process of comprehensive tank plus reaction tank. Meanwhile the two kinds of dispersed dyes and one kind of sulfur dye among the hydrophobicity were chosen to do coagulation experiments, in order to obtain optimism coagulant and dosing amount. Finally, the two kinds of typical dying and print wastewater were chosen to do the experiments with the optimism parameter which were obtained by experiments, in the end, there were cases studies to be discussed.The experiments results of active dyes,directive dyes and sulfur dyes indicated that the optimism amount of FeSO4 is 30mg/l, and the optimism detention period in comprehensive tank are 7h,8h,9h respectively, the removal rate of COD are 48.7%,47.4% 43.2% respectively, the removal rate of chromaticity color are 52.3%,52.6% and 51.9% respectively. PH are decreasing with HRT period. In the reaction tank, the optimize detention period is 6-8h, the removal rate of COD are 65.6%,68.4% and 64% respectively, the removal rate of chromaticity color are 74.5%,74.7% and 76.3% respectively.The experiments results of hydrophobicity dyes indicated that the mixed coagulant is the optimism coagulant and when COD and chromaticity color of wastewater are 832.3-876.0 mg/l and 804-820 times, the optimism dosing amount is 200mg/l in both dispersed red dye and dispersed blue dye distribution, but in the sulfur black dye distribution, the optimism dosing amount is 150mg/l, the sequence of treatment efficiency are sulfur dye distribution better than dispersed blue dye better than dispersed red dye. The experiments results of wastewater treatment of active dyes from manufacturing indicated that the COD and chromaticity color of the outlet are 79.9mg/l and 38.2 times respectively when the COD and chromaticity color of the inlet are 630.7mg/l and 397.1 times respectively. Meanwhile, The experiments results of wastewater treatment of dispersed dyes from manufacturing indicated that the COD and chromaticity color of the outlet are 89.4mg/l and 31.4 times respectively when the COD and chromaticity color of the inlet are 966.6mg/l and 455.9times respectively. By the case study discussions, the results showed that the process of comprehensive tank plus reaction tank is a practicable treatment method.The feature of the study is that the water affinity and hydrophobicity of dye were categorized, and the innovation points of the study are: in the comprehensive tank, Fe2+ was adding into the system, when the DO is less than 0.5mg/l, the hydrolytic action was going and the complexation reaction and reaeration reaction were going as well between Fe2+ and dyes. In the meantime, Fe2+took part in the biological reaction, so the multifunction of hydrolytic,chemical coagulation and biological reaction were conducted, in the very short period, the removal rate of COD and chromaticity color were improved significantly.A kind of effective and practicable treatment method was given in the study for the treatment of dying and print manufacturing wastewater.