涂铁污泥吸附处理中低浓度氨氮废水

来源期刊：有色金属科学与工程2013年第1期

论文作者：柴立元 陈云嫩 罗仙平 丁丽超

文章页码：53 - 56

关键词：氨氮废水；氯化铁改性；污泥；吸附

Key words：waste water containing ammonium-nitrogen; modified by ferric chloride; sewage sludge; adsorption

摘    要：未经处理或处理不完全的含氮污染物的任意排放给环境造成极大的危害，而采用传统方法处理中低浓度氨氮废水效率不高.文中以某污水处理厂的剩余活性污泥为基质，其表面经一定浓度的氯化铁溶液改性2 h后用作吸附剂处理中低浓度氨氮废水.实验结果表明：室温时经0.15 mol/L的氯化铁溶液改性的涂铁污泥用量5 g/L，pH值为 9，反应40 min即可达到氨氮去除率95 %以上，且该吸附反应符合拟二级速率方程.将此工艺条件用于处理氨氮浓度为102.68 mg/L、COD为362 mg/L的实际工业废水，处理后滤液中氨氮浓度9.2 mg/L、COD 83 mg/L，达到《污水综合排放标准（GB8978-1996）》一级标准（NH4+ 浓度<15 mg/L和COD<100 mg/L）.

Abstract: Uncontrolled discharge of untreated or incompletely treated nitrogenous pollutants has caused a great deal of harm to the environment. The traditional technologies are inefficient for treating medium-low ammonium-nitrogen. Using residual activated sludge from sewage plant modified 2 h by ferric chloride as adsorbent, wastewater containing medium-low ammonium-nitrogen was treated. The experimental results indicate that the removal rate of ammonium- nitrogen can attain above 95 % with 0.15 mol/L ferric chloride, 5 g/L dosage (pH=9) after 40 min reaction at room temperature. The adsorption process accords with pseudo second-order kinetics equation. Under the experimental conditions, initial ammonium-nitrogen concentration and COD being 102.68 mg/L and 362 mg/L, was reduced to 9.2 mg/L and 83 mg/L for NH4+ and COD respectively, after adsorption treatment in actual industrial wastewater. The discharged waste water has achieved （NH4+<15 mg/L and COD<100 mg/L）.