Basic Research Of Printing And Dyeing Wastewater Treatment By Total Reflux And Part Of Reflux Of A/O Process

The research is on the basic of predecessor about using a reactive activity yellow in the laboratory and add a new dyestuff- reactive brilliant red.It make a substantial step that direction of A/O technology total reflux treating printing and dyeing effluent from experimental stage to putting in the production. This article has a research at macroscopic level on comparing the variation of water quality in different working conditions. This article also has an exploration at microcosmic level for internal activity& surface characteristic of the sludge and the relevance of effluent quality. Finally, the article comes to conclusions by analyzing bacterial spawn to choose superiority and analyzing the degradation degree of mixed dye.Conclusions are as follows:1.Compare the CODcr average removal efficiency of two technology:Anoxic zone:traditional technology-56.32%; modified technology-67.47%;Aerobic zone: traditional technology-72.91%; modified technology-78.89%;So there is a summing-up that modified technology has better average removal efficiency for CODcr.2.Compare the CODcr color removal efficiency of two technology:Anoxic zone:modified technology-58.11%; traditional technology-39.32%; Aerobic zone: modified technology-30.31%; traditional technology-35.02%;Anoxic zone of modified technology has a strong ability of degradation for the complex refractory macromolecular organic matter. Although aerobic aeration stage degrades organic pollutant, its color removal efficiency effect is not obvious. It depends mainly on the organic matter degradation of anoxic zone, so that reduce the chromaticity.3.Measure the content of EPS’s polysaccharide and protein by usingthe method of anthranone & sulfuric acid. The smaller value of polysaccharide & protein which with the higher removal efficiency, and sedimentation of activated sludge also improved. However,modified technology’s polysaccharide & protein average value is smaller than traditional technology’s in both of anoxic and aerobic zone. And water quality is closer to neutral,polysaccharide & protein average value becomes bigger. Modified technology’s anoxic and aerobic zone lessen than traditional technology’s for the proportion of water qualityclosing to neutral. If researcher can control the p H in the aeration tank properly, it makes activated sludge keeping in a state of higher activity.4.Measure the ratio of hydrophobic about the each reactor by turbidimetry and analyze experimental results: the ratio of hydrophobic is between 0.51 and 0.73 in traditional technology’s anoxic zone, ATP concentration is within the range of0.32-0.45mg/L. The CODcr removal efficiency is improved, aerobic digester. When the ratio of hydrophobic is between 0.48 and 0.52, ATP concentration is within the range of0.62-0.73mg/L. The CODcr removal efficiency is improved, and is within the range of70.25%-79.13%. When the ratio of hydrophobic is between 0.83 and 0.95 in modified technology’s anoxic zone, ATP concentration is within the range of 0.72-0.93mg/L. The CODcr removal efficiency is improved, aerobic digester. When the ratio of hydrophobic is between 0.53 and 0.65, ATP concentration is within the range of 0.65-0.83mg/L. The CODcr removal efficiency is improved, and highest value is up to 81.32%.So above is concluded that modified technology can be gained higher CODcr removal efficiency in a wide range ratio of hydrophobic.5.Screening and analysis for dominant bacteria based on the traditional technology and modified technology’s anoxic zone, there is a summing-up that the dominant bacteria of traditional anoxic zone is A3; the dominant bacteria of modified anoxic zone is C2 and C7. A3 and C7 maybe belong to the same bacterial genus and C2 maybe belong to another bacterial genus. Screening and analysis for dominant bacteria based on the traditional technology and modified technologys’ s aerobic zone there is also summing-up that the dominant bacteria of traditional aerobic zone is B3; the dominant bacteria of modified aerobic zone is D4.B3 and D4 is not belong to the same bacterial genus.6.The ultraviolet spectrum was used to conduct a research to analyse the varied degradation effect for dye of the traditional technology and modified technology during different degradation stages. The modified technology enable the chromophoric group that —N=N— of the K-2BP and KNR broken bond, then the organic macromolecule of dye degrade to the small organic molecule with benzene ring or naphthalene nucleus, the naphthalene nucleus open its rings and its feature that the absorption peak almost disappeared. Meanwhile, since the azo bond has been broken by the modified technology,the treatment efficiency of the modified technology are much better than the traditional technology in the dye wastewater decolorization and many aspects. And, according to theorganic compounds removal performance of the traditional technology and modified technology via IR, the modified technology has better performance in organic compounds degradation which could removes unsaturated functional groups effectively.In conclusion, the premise of adding a dye reactive brilliant red K-2BP, the effect of using the modified technology to deal with printing and dyeing wastewater is better than A/O traditional technology. Meanwhile, there is a certain correlation between surface characteristic of sludge and internal activity of sludge microorganism, and process water effect also correlated.