A digesting measurement method of municipal sewage sludge’s TN and TP
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Abstract:
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%.
