草浆中段废水不同生物处理工艺的比较研究

Comparative Study on Different Biological Processes for Treatment of Straw-pulp Mid-term Wastewater

以水解酸化作为前期处理,再分别结合活性污泥法、SBR、接触氧化法处理草浆中段废水。发现在水解酸化运行阶段溶解氧(DO)水平对CODCr的去除有重大影响:DO在0～0.5mg/L时,去除率仅为44%;DO在0.5～1mg/L时,CODCr的去除率达到68%。水解酸化后,分别用活性污泥法、SBR、接触氧化法继续处理,CODCr的去除率分别为54%、55%、66%。结合三套工艺的运行条件和成本,以及处理效果,认为草浆中段废水处理的最佳工艺应为:水解酸化-SBR工艺。

Using hydrolyzing acidification as pre-treatment,straw-pulp mid-term wastewater was treated withactive sludge, SBR and bio-membrane methods. It wasfound that dissolved oxygen (DO) levels of hydrolyz-ing acidification could significantly affect the removalof CODCr. When DO was 0～0.5mg/L, CODCr removal rate was only 44%; when DO was 0.5～1mg/L, CODCrremoval rate up to 68%. After pre-treatment, the waste-water was continuously treated with active sludge,SBR and biological contact oxidation process., CODCrremoval rates were 54%, 55% and 66% respectively.Comprehensively considering the running conditions,costs and CODCr removal, the biological process ofhydrolyzing acidification-SBR was the best.