Application Of Strengthened Anaerobic Biological Treatment Technology In The Advanced Treatment Of Printing And Dyeing Wastewater

Printing and dyeing wastewater had high COD,chromaticity,p H,poor biochemical and complex component.It had become a difficult degradable industrial wastewater.In addition printing and dyeing industry developed fastly in jiangsu and zhejiangprovince, printing and dyeing wastewater had large emissions, causing great damage to the environment,whitch had severely restricted the local economic sustainable development. This paper was to design the three-stage anaerobic column and printing and dyeing wastewater as the research object, studied capacity packing, hydraulic retention time, volume load, rising velocity, temperature, p H and other factors on the printing and dyeing wastewater treatment effect, finding out the best optimization process parameters and the regularity of COD degradation.And under the optimum process parameters by adding the Ca2+, PAM, activated carbon, tochange the structure of anaerobic sludge carrier, further improving the processing performance of anaerobic column to strengthen the printing and dyeing wastewater treatment effect.And made a comparation between before strengthened column and after strengthened column anaerobic treatment.Finally in the end of the three-stage anaerobic column processing adding Fenton oxidation for the depth treatment of printing and dyeing wastewater.The study showed :By comparing three different fillers on the COD removal efficiency, the results showed that the effect of the ceramsite is best, followed by Al2O3, zeolite doped effect of steel slag was the worst;The experiment determined the best hydraulic retention time as 16 h, B/C ratio was maximum at this time;Controlling the hydraulic retention time as 16 h, volume load 2.127 kg COD·m-3·d^-1, three-stage anaerobic column total COD removal rate was almost 74%- 78%;At the phase of load ascension,in the first ten days VFA concentration change was bigger, later the VFA gradually stabilized, showing that methanogens growed better, the column did not become acidificated as the accumulation of VFA.In strengthened anaerobic phase, the COD removal rate of anaerobic column 2 increased rapidly while Ca2+ was in 70-280 mg·L^-1, showing that adding Ca2+ benefited on COD removal;Anaerobic column 3 selected adding peach shell, coal and coconut shell activated carbon, the results showed that adding coal activated carbon effected best, the best additive quantity was 350 mg·L^-1;Fenton experiment determined H2O2, Fe SO4 optimum dosage as 450mg·L^-1, COD reduced from 286 to 55 mg·L^-1, chromaticity reduced from 150 times to 85 times;Raw water through enhancing anaerobic column 1, 2, 3, and finally used Fenton method, B/C ratio increased from 0.22 to 0.43.