城市污泥总氮、总磷消解测定方法

A digesting measurement method of municipal sewage sludge's TN and TP

设计了正交实验并分析了H2O2与H2SO4消解污泥过程影响因素,在测定总氮时H2O2添加次数在0.1水平下具有显著性,而H2O2用量和H2SO4用量对总氮的测定影响较小,较优的消解方案:H2O2添加次数为3次、每次消耗为0.25mL,H2SO4用量为1mL;在测定总磷时H2O2添加次数在0.01水平下具有显著性,H2O2单次用量在0.05水平下具有显著性,而H2SO4用量对总氮的测定影响较小,较优的消解方案:H2O2添加次数为3次,每次消耗为0.25mL,H2SO4用量为5mL。综合考虑,总氮、总磷测定方法的最佳方案即H2O2添加次数为3次,每次消耗为0.25mL,H2SO4用量为5mL。按照该消解方案,测出总氮的回收率在98.53%～101.80%,总磷的回收率在97.07%～101.67%。

Parametric study with orthogonal experiment is carried out for digestion of municipal sewage sludge with H2O2 and H2SO4.For TN,the adding time of H2O2 is significant at 0.1 level,whilst the dosages of H2O2 and H2SO4 are less significant.The better digestion scheme is that the number of adding time of H2O2 is three and the dosages of H2O2 and H2SO4 are 0.25 mL and 1 mL,respectively.And for TP,the adding time of H2O2 is significant at 0.01 level,and the dosage of H2O2 is significant at 0.05 level.However,the dosage of H2SO4 is less significant.Thus,the better digestion scheme is that the adding time of H2O2is three and the dosages of H2O2 and H2SO4 are 0.25 and 5mL,respectively.Combining the two schemes,the optimal scheme of sludge digestion is three times for H2O2 adding and 0.25 and 5mL for the dosages of H2O2 and H2SO4,respectively.With the test,the recovery rate of TN is between 98.53% and 101.80%,while the recovery rate of TP is between 97.07% and 101.67%.