Research On The Advanced Treatment Technology Of Printing And Dying Wastewater

To solve the problem about the shortage of water resources and contamination due tomassive emissions of printing and dying wastewater of textile printing and dyingenterprises,experimental research on the advanced treatment of printing and dyingwastewater was conducted. The main investigated treatment processes included arecoagulation sedimentation,biological activated carbon, photocatalytic oxidation and thecombination of coagulation sedimentation and photocatalytic oxidation and biologicalactivated carbon process.Coagulation and sedimentation can remove most of the suspended solids and someorganic matters and chroma in effluent of the secondary treatment of printing and dyingwastewater.In this paper,we selected the dicyandiamide decolorizer was seected which couldremove the color of printing and dying wastewater effectively. In the research ofbiochemistry tail water which was treated by secondary from textile factory dying wastewaterin Shandong,experimental studies show that the water treated by coagulation andsedimentation did not reach of the requirment of reuse water, but it can effectively reduce thepollutant load of the following advanced treatment process.The small experiments used the BAC craft to treatment the reactive red X-3B simulatingprinting and dying wastewater, in order to make the water reused.Shewanella bacterias withgood effective decoloration function were used in this process during biofilm forming, whichare filtered out for treating printing and dying wastewater, experiments investigated theoptimum operating conditions and wastewater treatment effect in this process. The BAC hasgood ability of shock resistance.Experimental studies showed that the optimum conditions forbiological activated carbon is:Gas-water ratio is 1.5:1, the hydraulic retention time is 3h, thebest carbon filtering media layer is 1000mm, during the process stable operation the CODremoval rate is up to 88.2%, Color removal rate is 87.4%, TOC removal rate is 70% ,UVCrremoval is up to 76.58%, CODand chroma were 47mg/L and 56 degrees in effluent wat2e5r4Cr,they can meet the requirements of the reuse water for textile printing and dyingenterprises.This process treated reality printing and dying wastewater also had a good results.Based on the researching of printing and dying wastewater single deeplytreatment,combined with more mature theory system of Wuhan textile university andpreliminary industrial test results of the photocatalytic oxidation technology,this article is putforward about how to deeply treatment the printing and dying wastewater by the combinationprocess of coagulation sedimentation and photocatalytic oxidation and biological activecarbon. Firstly, using coagulation sedimentation pretreatment printing and dying wastewaterto remove a part of suspended solids and some organic matters and chroma,then usingphotocatalytic oxidation technology to deal with the hard microbial degradation organicmatters,make them into the middle of the biodegradable mattres,and then have these marrersfor biological treatment,so that the organic matter ore into inorganic or into pollution-freeorganic.Combined process treated with secondary biochemical tail of printing and dyeingwastewater COD5.59%,the efflueCnr, color, TOC and UV water COD254removal rates are 78.48%, 86.46%, 72.56%,8 on orgCarand color were 56mg/L and 48 degrees by this combined process,have a good effectnic and color removal.