Study On Advanced Treatment Of Alkali-Minimization And Dyeing-printpng Wastewater By Upflow Aerated Bological Activated Carbon Filter

Nowadays, as water resources shortage and wastewater treatment costs continue to rise, dyeing wastewater should be treated with advanced treatment. The study on making the effluent achieve the non-potable standard is of vital practical significance. In this thesis, a biological aerated filter(BAF) is adopted for treatment, the effluent from Anaerobic blanket reactor(ABR) and Aerobic contact oxidation is used as the target water of treatment, the emphasis is the factors of BAF, biomass, biological activity.The result indicates when the gas-water ratio is3:1and hydraulic retention time(HRT) is9h, the BAF gets the best removal effect of pollutants. the average removal rate of COD, chromaticity, UV254and turbidity were74.4%、94.9%、91.7%and78.2%, and the corresponding average COD, chromaticity, UV254and turbidity of effluent were separately35.3mg/L,3.2,0.132and4.76NTU which met the reuse standards of reclaimed water.The average removal rate of the reactor COD is78.5%in the temperature>20℃, the corresponding average COD is less than25mg/L which met the reuse standards of reclaimed water. When the temperature＜10℃, the average removal rate of COD is only52.9%, the corresponding average COD more than50mg/L, cannot satisfy the reuse standards of reclaimed water. PH was between7.5and8.6, and aeration activated carbon biological filter to the highest removal rate of COD, the removal rate of66%～78%.An upflow aerated biological aerated carbon filter (UABACF) was applied to treating alkali-minimization and dyeing-printing wastewater. Under the fixed gas-water ratio of3:1, the impact of HRT(hydraulic retention time) to the degradation of COD, UV254and chroma was researched. The relations among pollutants degradation characters, biomass, dehydrogenase activity and the height of filter column were also analysed. It shows that the impact of HRT to pollutant removal order is as follows:COD, chroma, UV254. The average removal rate of COD, chroma and UV254were74%,95%and92%separately with HRT was8.90h. Under the experiment conditions, the region below the height of110cm filter column is efficient to the degradation of pollutants, where the microbial biomass and dehydrogenase activity to unit mass activated carbon gradually reduce and then maintain the basic stability of the state. But microbial activity expressed as the ratio of dehydrogenase to biomass increases below the height of70cm filter column and decreases between the height of70cm to11Ocm filter column, then a rising trend appears in the higher filter column.The kinetc model of removing organic of UABACF can be obtained through analyzing removal kinetic model of organic csterase:Sc=S0*e(?)...