Design and Operation of the Printing and Dyeing Wastewater Treatment Project by Combination of Coagulation Sedimentation-Hydrolytic Acidification with Aeration Tank-Biological Aerated Filter-Active Sand Filter

摘要

In order to protect quality of Baiyangdian surface water and Gaoyang groundwater,the project is applied to process printing and dyeing wastewater that contains complicated compositions,high concentrations of organics and SS,and lots of pollutants difficult to degrade by microorganism. The process and operating parameters of project are optimized and debugged,and its economic and environmental benefits are analyzed.The results show that the process of coagulation sedimentation-hydrolytic acidification with aeration tank-biological aerated filter-active sand filter is applied in Gaoyang Sewage Treatment Plant. The design scale of sewage treatment plant is 120000 m3/d. The influent is as following: COD is 669mg/L; SS is 424mg/L; NH3-N is 8.83mg/L; TP is 6.03mg/L. After the process,the best removal rates of COD,SS,NH3-N and TP are 93. 5%,98. 8%,97. 1% and 96. 2%,respectively. The various indexes of effluent water complied with standard A of the first order in Pollutants Emission Standard of Urban Wastewater Treatment Plant（ GB 18918-2002）. The processing cost is only 0. 807 yuan/m3. As a result,the project construction and operation not only improve the environment,but also promote regional economic development. Process design and operating parameters provide an important reference value for the printing and dyeing wastewater treatment industry.