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次氯酸钠对污水处理厂二级出水消毒效果的影响因素探讨
Investigation on Influencing Factors of Disinfection Effect of Sodium Hypochlorite on Secondary Effluent of Wastewater Treatment Plant
【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。
【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.
【Key words】 sodium hypochlorite; secondary effluent; ammonia nitrogen; fecal coliform;
- 【文献出处】 净水技术 ,Water Purification Technology , 编辑部邮箱 ,2019年01期
- 【分类号】X703
- 【网络出版时间】2019-01-24 11:54
- 【被引频次】7
- 【下载频次】343