| As one of our country’s traditional pillar industries, textile printing and dyeingindustry made great contribution to our economy. but at the same time, the wastewater alsohas caused serious environmental problems in China, which greatly restricted rapiddevelopment of the printing and dyeing enterprise. Now treatment process of printing anddyeing wastewater is faced with enormous challenges, especially when new dyes andadditives are widely used and the use of the current discharge standard of state and localgovernment.Given the technology difficulties of wastewater treatment in dyeing and printingindustry in our country, a brand-new treatment technology integrated physic-chemistry andbiology was put forward in this thesis, in which the micro-electrolytic material of iron andcarbon was integrated respectively in the anaerobic and aerobic biological reactor to treatactual printing and dyeing wastewater.Mainly research contents and conclusions are as follows:⑴Startup of biological treatment system and preparation of micro electrolyticmaterial of iron and carbonUASB reactor was successfully started up with simulated glucose wastewater byalternately increasing COD concentration and liquid flow alternately. After eighteen daysof running, COD removal rate reached92%, and volume load reached above6kg/m3·d;The SBR reactor was acclimatized by the effluent of UASB reactor,,COD removal rate ofwhich reached above56%after eighteen days;The iron carbon micro electrolytic materials were prepared by single-factorexperiment and orthogonal experiment, of which the BET is51.99m2/g and the pore size isabout12.75nm.42%of COD removal rate and85%of chroma removal rate were reachedunder the optimal condition by these materials treating actual printing and dyeingwastewater of different batch.⑵UASB-SBR process integrated with iron carbon in treating actual printing anddyeing wastewater and advanced treatment of the actual printing and dyeing wastewater byiron carbon The actual printing and dyeing wastewater with200of chroma and1100mg/L ofCOD concentration was treated using UASB-SBR integration process, ultimately the finalCOD degraded in anaerobic period was167mg/L, and chromaticity degraded in aerobicsection was below50; integrating the homemade iron carbon with biological reactor totreat actual printing and dyeing wastewater, COD average of final effluent was91.35mg/L,and chromaticity was below40.Advanced treatment of SBR effluent was also studied by using homemade iron carbon,and the final COD under50mg/L and chromaticity under4, which had completely met thelatest national discharge standards and provided a new thought for the further processing ofthe wastewater.⑶Researches on the operation parameters of UASB reactor, physicochemicalproperties of anaerobic granules and microbial diversityKeeping the water alkalinity, VFA accumulation, pH, temperature and ORP inappropriate range is very important to guarantee the stable operation of UASB reactor.With the higher ratio of printing and dyeing wastewater in influent, no obvious change wasobserved on particle size of the granular sludge, while a trend of first decrease and thenslight increase happened of the mechanical strength, a trend of first increase and thendecrease in specific methanogenic activity of the granules.Microbial diversity of anaerobic granular sludge was studied by PCR-DGGEtechnique. It was found that Bacteria can be divided into two groups when treating actualprinting and dyeing wastewater in the UASB reactor, first group of which contained a lotof functional control flora reducing gradually with the increase of the proportion ofprinting and dyeing wastewater; the second group contained a lot of anaerobic digestionbacteria, Bacterial diversity index experienced three stages of "increase-decrease-increase".In the whole process, no significant change happened to the advantage bacterium group ofArchaea, but the diversity index was more complicated than Bacteria with four stages of"decrease-increase-decrease-increase". |
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