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- Title
Effect of hydrogen peroxide on nitrogen forms in sewage sludge subjected to the anaerobic stabilization.
- Authors
Zawiej, Iwona; Wolny, Lidia
- Abstract
Changes in the forms of nitrogen in sewage sludge depend on the value of pH, process temperature and its amount in the substrate used for biodegradation. These forms have a significant effect on methane fermentation processes. In the water environment, ammonium nitrogen contained in organic compounds is subjected to ammonification and transformed into the mineral form of ammonium nitrogen. The aim of this study was to determine the effect of chemical modification of excess sewage sludge with an oxidative reactant on the value of Kjeldahl nitrogen and ammonium nitrogen observed during anaerobic stabilization. After the process of 8 and 25 d anaerobic stabilization of non-conditioned and chemically disintegrated excess sludge, the proposed sludge modification was found to have an effect on the increase in Kjeldahl nitrogen and ammonium nitrogen levels. The doses of sludge reactants were equal to 1.0 and 5.0 mL H2O2/L, and time of contact with sludge was 2 h. In the case of methane fermentation of sludge subjected to chemical disintegration using hydrogen peroxide, on the 8th day of the methane fermentation, the values of Kjeldahl nitrogen and ammonium nitrogen were equal to 322 N/L and 314 mg N-NH4/L, respectively, for dose 1 mL/L of sewage sludge, and equal to 344 N/L and 342 mg N-NH4/L for dose 5 mL/L of sewage sludge. In addition, on the 25th day of methane fermentation, the values of Kjeldahl and ammonium nitrogen were 567 N/L and 551 mg N-NH4/L, respectively, for dose 1 mL/L of sewage sludge, and were 598 N/L and 586 mg N-NH4/L for dose 5 mL/L of sewage sludge.
- Subjects
BIODEGRADATION of sewage sludge; METHANE fermentation; NITROGEN in water
- Publication
Desalination & Water Treatment, 2018, Vol 117, p301
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2018.22526