| According to the water quality characteristics of textile printing and dyeingwastewater: CODcris lesser, biochemical sex is worse,etal, the processing technologyis mostly hydrolysis acidification-oxic aerobic-settlement process. In this process,the part of the backflow sludge in the secondary settling tank will be usuallybackflowed into the oxic aerobic tank, the rest of the sludge is letted out; while fewprocesses are that all the backflow sludge in the secondary settling tank will bebackflowed into hydrolysis acidification pool.In order to describe conveniently, theprocess that the refluent sludge without being refluxed into hydrolysis acidificationpool is named by the non-backflow process,if the refluent sludge is refluxed into thehydrolysis acidification pool,it is named by the backflow process.which way isexactly more effective to printing and dyeing wastewater treatment, This paper, fromthe two variational aspect of the water quality and sludge microorganism,the differentlevels for printing and dyeing wastewater degradation from the two ways will beresearched and compared from microscopic mechanism.This topic is based on the printing and dyeing wastewater treatmentprocesses from the printing and dyeing Co, LTD in Xian yang, and designed a set ofexperimental simulate process,this simulate process included hydrolysis acidification-oxic aerobic-settlement process, the simulate printing and dyeing wastewater as rawmaterial, The two kinds of technology including the non-backflow process and thebackflow process are explored and compared with the different levels of thedegradation of printing and dyeing wastewater sludge and the changes of sludgemicrobial properties,seeking a more conducive to printing and dyeing wastewaterdegradation process. Certain theoretical basis is provided in the optimization design ofprinting and dyeing wastewater treatment for the hydrolysis acidification-oxic aerobic-settlement process.1Chemical oxygen demand(CODCr), pH and dissolved oxygen(DO) in thewastewater are designed through the fast digestion spectrophotometric method, pHmeter and the determination of dissolved oxygen,and studied the influence of theCODCrremoval from the change of pH and DO in water,the result shows: the mainfactors leading to the changes of water quality and sludge micro-organismsenvironment both of the processes is pH, DO is not obvious.2Through the experiments of CODCrand color in the different processes analysising and obtaining: The average CODCrremoval rate is71.7%from the oxiczone of non-backflow process, the average CODCrremoval rate is83.7%from theoxic zone of backflow process, this explaines the CODCrremoval efficiency in thebackflow process is better than that in the non-backflow process. The color removalrate is in the backflow process better than that the non-backflow process, Themaximal color removal rate is about40%in the oxic aerobic.3The exocellular polysaccharide polymer and protein are determinedthrough the Anthracene ketone sulfuric acid method and Exam MaSiLiang bluemethod,and study the activity of exocellular polymer and intracellular sludge from thesludge microorganisms,the result shows: there is no regularity between the sludgeflocculating sedimentation sex and the total quality of polysaccharides and protein,they are affected by the the ratio of the exocellular polysaccharide polymer andprotein, the greater the proportion of polysaccharide is,the poorer the sludgeflocculation is, the the ratio of the exocellular polysaccharide polymer and protein inthe neutral condition is more than the alkaline and acidic environment, the the ratio ofthe exocellular polysaccharide polymer and protein is the lest in the acidicenvironment.Using the extraction and turbidity method, the scanty water ratio of sludge inthe both of processes is determined and showed that: The hydrophobic and CODCrremoval efficiency of the sludge is positively associated, in order to ensure the waterhydraulic loading of the oxic aerobic pool not too lower, the the hydrolysisacidification effect of oxygen bacteria and the degradation ability of aerobic bacteriaare made fully useful.when non-backflow process is operated, ATP concentrationshould be controlled between0.38and0.57mg/L in the hydrolysis acidificationprocess,ATP concentration should be controlled between0.86and2.17mg/L in theoxic aerobic process, the changing range of the sludge scanty water ratio is60.7%to69.5%.when the backflow process is operated, ATP concentration should becontrolled between1.8and2.3mg/L in the hydrolysis acidification process, the scantywater ratio at about65%;ATP concentration should be controlled between2.0and3.3mg/L in the oxic aerobic pool, the changing range of scanty water ratio is71.8%to88.8%.4The study of sludge properties is mainly measuring and comparing the sludgeconcentration, sludge olume indices and volatile suspended solid concentrationthrough the national standard method,the result shows that: the sludge olume indices of the backflow process,the average SVI is146in the normal range, sedimentperformance is well; the sludge olume indices of the non-backflow process,theaverage SVI is97, sediment performance is worse,the sludge is easy to inflate,it isdifficult to control in the actual operation.5The strains in the hydrolysis acidification pool and oxic aerobic pool arecounted through the vaccination plate dilution method,then the advantage strains usedto degradate KNR dyestuff are getted through the wave bottle fermentationexperiments,and identify them.The result shows that: the advantage strains in thebackflow process are not completely same with them in the non-backflow process.6The out-water in the backflow and non-backflow process is scannedaccording to the ultraviolet and infrared spectral,the result shows that the dregree ofdyestuff degradation is not same in the different stage, The dyestuff chain solutionrole through the hydrolysis acidification pool in the backflow process is better than itin the non-backflow process,and the unsaturated functional groups of organismsincluding C=O、C=C、N=O etal are removed completely in the backflow process,thispoint is better than the non-backflow process.The classic theory is that: the sludge of the secondary settling tank is goodanaerobic sludge,that is the oxygen sludge in the hydrolysis acidification pool,so partof the sludge from the secondary settling tank backflow the oxic aerobic pool,the restof sludge enters into the sludge concentration tank and is disposed, the oxic anaerobicdoes not generally enter into the hydrolysis acidification pool. This topic think that:the oxic anaerobic sludge to join does not affect the oxygen environment of the sludge,on the contrary make the active of the oxygen whole system has improved a lot. |
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