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Related Experiment Videos

Sludge hydrolysate as a carbon source for denitrification.

V Aravinthan1, T Mino, S Takizawa

  • 1Department of Urban Engineering, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 31, 2001
PubMed
Summary

Sludge hydrolysate can be a carbon source for biological nitrogen removal. Autoclaved alkaline sludge hydrolysate showed the highest denitrification and protein degradation rates, improving treatment efficiency.

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Wastewater Treatment

Background:

  • Biological nitrogen removal processes often require external carbon sources like methanol or acetate to enhance denitrification efficiency.
  • Excess sludge from wastewater treatment plants contains organic carbon, a potential carbon source for denitrification after hydrolysis.
  • Sludge hydrolysis is a necessary step to make the organic carbon in excess sludge bioavailable for denitrification.

Purpose of the Study:

  • To evaluate the biodegradability of sludge hydrolysate produced by different solubilization methods (alkaline, acid, autoclaved, combined).
  • To determine the impact of solubilization methods on the efficiency of sludge hydrolysate as a carbon source for denitrification.
  • To analyze the relationship between sludge solubilization, protein and carbohydrate degradation, and denitrification rates.

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Main Methods:

  • Sludge hydrolysis using alkaline, acid, autoclaved, and combined solubilization techniques.
  • Assessment of sludge hydrolysate biodegradability through denitrification rate measurements.
  • Quantification of protein and carbohydrate degradation rates in sludge hydrolysates.
  • Evaluation of COD (Chemical Oxygen Demand) degradation rates.

Main Results:

  • The method of sludge solubilization significantly influences the biodegradability of the resulting hydrolysate.
  • Autoclaved alkaline sludge hydrolysate exhibited the fastest denitrification rate (250 mgN/gMLSSCOD/d), linked to high protein degradation (247 mgCOD/gLSSCOD/d).
  • Alkaline, autoclaved, and acid autoclaved hydrolysates showed similar denitrification rates (185-200 mgN/gMLSSCOD/d), with varying protein and carbohydrate degradation efficiencies.

Conclusions:

  • Sludge hydrolysate is a viable internal carbon source for enhancing denitrification in biological nitrogen removal.
  • Autoclaved alkaline sludge hydrolysis is effective for maximizing protein degradation and subsequent denitrification rates.
  • The presence of easily and slowly biodegradable fractions in sludge hydrolysates affects overall degradation and denitrification performance.