The High Concenteation Acid Dye Wastewater

This study selected high concentration acid dye waste water as the researchobject. The waster water has high concentration, deep color, and high salt content.It is very difficult to deal with industrial organic wastewater. In our country, theenvironmental pollution is extremely serious, to the industrial production hasbrought large economic losses, this kind of wastewater management job isstrengthened urgently. This paper aims at studying a set of mature desaltingprocess.The first chapter briefly generalizes the current situation of dye industry andstudies on dye wastewater characteristics. And then it selectes the correspondingprocessing method, namely it provides research basis for the research. In thisstudy, a focus of the work is also in the removal of dyes from wastewater in highsalt content. Therefore, this paper expounds what is currently used in theindustrial production of various salt for the research use.The high concentration and high acid dye wastewater in the study is derivedfrom a Zhejiang dye production wastewater treatment factory, is to achieve thefactory processing requirements.The second chapter mainly introduces the high concentration and high aciddye wastewater by the bench test and the pilot test method. The highconcentration and high acid dye wastewater is difficult to use a single itselfindependent processing method for direct processing, so, the best optimumcombination should be selected to satisfy industrial production needs in theprocess followed. The preliminary determination of small-scale test steps arefrom water to MgO and from Fe to Fe/C electrolysis, adsorption, watercoagulation. Tests on MgO and unit reduces the acidity of wastewater,simultaneous removal of part of its salt; through the iron reduction and iron carbon micro electrolysis reaction removal from wastewater chroma and reduceCOD_Cr; the adsorption coagulation unit further removal of wastewater chroma,reduces the salinity, reduces COD_Cr.Through the test to determine the optimalexperimental conditions, reach the design scheme effluent requirements: chromais50times, the value of COD_Cris4450mg/L,and the removal rate salt is15.9%.From the experimental results and the operation of desalting effect can be seen,the selected process of this experiment is feasible. The next step for the firststage test, the validation pretreatment scheme is feasible, and according to thefield test condition the process is adjusted to the reasonable and reliableoperation.In the practice in trial operation of desalination pretreatment testing,because large amounts of viscous substance SS contained in the dispersing dyeconcentration waste water have cover on the shavings scrap iron surface,they greatly reduces waste filler and effective contact area and has hindered themicrocell electron transfer between the iron carbon micro electrolysis reaction,reduces the reaction efficiency. Therefore, after the pilot after adjustment processand three days of the operation, we solve this problem. In the experiment ofdesalination pilot run, run for14hours, the desalted water total desalination ratearrived at62.8%, COD_Crfell25.3%; desalting exchange water salinity increasesby a factor of about2.7, COD_Cr for625mg/L; very little change took place indesalting water. And because the desalting equipment membrane stack is toosmall, the desalting rate is not high, operation time is long. In order to improvethe efficiency of desalination in economy bearing capacity can be multi-stagemultistage desalting equipment. In the second stage test increased experimentalwastewater COD_Cr=12000mg/L, change in the first stage test process,increasing aeration oxidation treatment unit, the continuous41hours of trialoperation, followed by a desalting treatment.After two stages of the field test, we obtain a certain engineering guidancefor dealing with data, basically achieve the concentrated wastewater pretreatmentrequirements. The treated water to reduce wastewater toxicity, improve thebiodegradability of wastewater effluent, lower salt content, through thick andthin water mixing can reach follow-up biochemical processing requirements.Therefore, we believe that can enter the engineering design work.