厌氧酸化在焦化废水脱氮和毒性削减中的作用

分别用厌氧酸化-缺氧-好氧(A₁-A₂-O)生物膜法和缺氧-好氧(A/O)生物膜法处理焦化废水,比较了二者对废水毒性的削减效果.试验结果表明,焦化废水的毒性大于0.19mg/L氯化汞的毒性.其毒性削减与有机氮去除有一定关系,厌氧酸化在提高废水有机氮去除率和降低废水的毒性方面起到了重要的作用.废水经A₁-A₂-O生物膜系统处理后,毒性大大降低,当HRT为37.9h时,出水对发光菌的相对发光度可达96.8%,其毒性相当于0.023mg/L氯化汞的毒性.

Effect of Anaerobic Acidification Treatment on Nitrogen Removal and Toxicity Reduction of Coke Plant Wastewater

Coke plant wastewater was treated by anaerobic acidification anoxic aerobic (A₁-A₂-O) biofilm process and anoxic aerobic (A/O) biofilm process respectively. Toxicity reduction effects of the two processes were compared. The toxicity of coke plant wastewater was equal to that of mercury chloride with concentration of 0.19mg/L. Its toxicity reduction was related to the removal of organic nitrogen. Anaerobic acidification unit acted an important role on removal of both organic nitrogen and reduction of toxicity of the wastewater. After treatment by A₁-A₂-O process, its toxicity can be decreased greatly. When HRT was 37.9 hours, The relative luminosity of the treated effluent to photobacterium can attain 96.8%, that is equal to the toxicity of mercury chloride with concentration of 0.023mg/L.