生物反硝化处理化肥废水的试验研究

Research on Fertilizer Wastewater Treatment by Biological Denitrification

用SBR反应器处理人工合成的化肥废水,以醋酸钾作为碳源,在37℃下将氯化钙浓度升至96.7 g/L,pH值控制在6.8～7.2.实验结果表明:生物反硝化作用在极端的环境条件下是可行的,可用于处理未经稀释的化肥废水.当氯化钙浓度从4.8 g/L升至96.7 g/L时,反硝化体积速率从76.8(mg·N)/(L·h)减少到1.7(mg·N)/(L·h).

Experiments of biological denitrification were performed in laboratory scale SBR reactors to treat synthetic fertilizer wastewater. The chloride concentration was up to 96.7 g Cl/L at 37 ℃ and the pH was controlled in the range 6.8 to 7.2. Potassium acetate was added as carbon source for the suspended cultures. The results of the experiments showed that biological denitrification was feasible at the extreme environmental conditions prevailing in undiluted fertiliser wastewater. However, the extreme conditions affected the denitrification rates. The volumetric rates were reduced from 76.8 mg· N/L· h to 1.7 mg· N/L· h between chloride levels of 4.8 to 96.7 g/L.