【摘要】 采用次氯酸钠对城市污水厂二级生物处理出水进行消毒试验,从氨氮浓度、pH、消毒时间、水温这4个方面,分析其对次氯酸钠消毒效果的影响。当氨氮浓度≤0.2 mg/L时,次氯酸钠最佳投加量为15 mg/L;氨氮浓度为0.2～0.4 mg/L时,次氯酸钠最佳投加量为8 mg/L;氨氮浓度约0.6 mg/L时,次氯酸钠最佳投加量为6 mg/L;氨氮浓度为0.8～1.2 mg/L时,次氯酸钠最佳投加量为5 mg/L。当pH值为5. 0～6.0时,10 mg/L的次氯酸钠投加量即可使出水达标,若pH值为8.0～9.0时,必须加大次氯酸钠的投加量至15 mg/L。冬季气温较低时,尾水消毒要考虑延长消毒接触时间。夏季水温较高,可以相应减少加氯量。一般消毒接触时间为15～30 min时消毒效果最佳。更多还原

【Abstract】 Sodium hypochlorite was used to disinfect secondary effluent of wastewater treatment plant.Factors affecting disinfection effect of sodium hypochlorite were analyzed from four aspects: ammonia nitrogen, pH, disinfection time and water temperature.When the concentration of ammonia nitrogen was less than 0.2 mg/L, the optimal dosage of sodium hypochlorite was 15 mg/L.When it was in range of 0.2 ～ 0.4 mg/L, the optimal dosage was 8 mg/L.When the concentration of ammonia nitrogen was about 0.6 mg/L, the best sodium hypochlorite dosage was of 6 mg/L.When the concentration of ammonia nitrogen was in range of 0.8～1.2 mg/L, the optimal dosage of sodium hypochlorite was 5 mg/L.When pH value was in the range of 5.0 ～6.0,with the dosage of 10 mg/L sodium hypochlorite,the effluent could reach the standard,and if pH value was in range of 8.0～9.0,the dosage of sodium hypochlorite must be increased to 15 mg/L.The temperature in winter was low, the disinfection contact time should be extended, and the higher temperature in summer could reduce chlorination.Generally, the best disinfection contact time was 15 ～30 min.更多还原