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Simple improvement of digested sludge quality: is postaeration the key?

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Postaeration improves sludge quality by removing total ammonia nitrogen (TAN) and enhancing dewaterability. This simple process offers significant benefits for sludge management and disposal.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment

Background:

  • Postaeration, introducing digested sludge to aerobic conditions, is understudied despite its potential benefits.
  • Limited data exists on postaeration's impact on sludge quality and sludge liquor.

Purpose of the Study:

  • To investigate the effects of postaeration on total ammonia nitrogen (TAN) removal, sludge dewaterability, and micropollutant concentrations.
  • To evaluate the influence of hydraulic retention time (HRT) and aeration intensity on postaeration performance.

Main Methods:

  • Batch experiments were conducted to assess initial impacts on TAN and dewaterability.
  • A semi-continuous batch reactor was used to study postaeration under varying HRTs (8, 6, 4, 2 days) and aeration intensities.
  • Analysis included TAN, sludge cake total solids (TS), and micropollutant concentrations (pharmaceuticals, EOX, AOX).

Main Results:

  • Postaeration achieved 40-60% TAN removal, with stripping and biological oxidation being key mechanisms.
  • Sludge dewaterability improved by 5-30% (relative increase in sludge cake TS concentration).
  • TS degradation was observed, suggesting further reduction in final sludge volume. Optimal results were noted at the longest HRT (8 days).

Conclusions:

  • Postaeration is an effective technology for enhancing sludge quality and reducing disposal volumes.
  • TAN removal and sludge dewaterability are significantly influenced by HRT and aeration.
  • Further research into micropollutant removal and process optimization is warranted.