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Related Experiment Videos

Simple process for nutrient removal from food processing effluents.

W G Raper1, J M Green

  • 1Wildern Consulting Group, 8 Davies Street, Brighton East, VIC 3187, Australia. wildern@mira.net

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 31, 2001
PubMed
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This study demonstrates a cost-effective method for treating food processing wastewater, significantly reducing nutrient levels before irrigation. The combined anaerobic pond and sequencing batch reactor (SBR) system efficiently removes biochemical oxygen demand (BOD) and nitrogen (N).

Area of Science:

  • Environmental Engineering
  • Wastewater Treatment
  • Nutrient Removal

Background:

  • Food processing effluents, especially from meatworks, are rich in nutrients like nitrogen (N) and have high biochemical oxygen demand (BOD).
  • Conventional anaerobic ponds in Australia effectively reduce BOD but offer minimal nutrient removal.
  • Current irrigation practices often exceed sustainable N application rates, necessitating nutrient reduction in effluents.

Purpose of the Study:

  • To investigate a cost-effective method for reducing nutrient levels in food processing effluents prior to irrigation.
  • To evaluate the combined use of anaerobic ponds and sequencing batch reactors (SBRs) for simultaneous BOD and nutrient removal.
  • To demonstrate the design and operation of full-scale treatment plants for meatworks effluent and combined domestic sewage.

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Main Methods:

  • Laboratory-scale trials were conducted to assess BOD removal and sludge disposal in anaerobic ponds.
  • Effluent from anaerobic ponds was treated in a sequencing batch reactor (SBR) designed for nitrification/denitrification.
  • Optimization of anaerobic pond operation focused on achieving a minimal BOD:N ratio for efficient N removal.

Main Results:

  • Anaerobic ponds effectively removed BOD and facilitated sludge disposal from meatworks effluent.
  • The SBR system achieved high removal rates: up to 98% BOD and 95% N.
  • Nutrient levels suitable for river discharge were achieved using lagoons, with phosphorus (P) removal possible via alum treatment if required.

Conclusions:

  • A combined anaerobic pond and SBR system provides a cost-effective solution for treating high-strength food processing effluents.
  • This approach significantly reduces nutrient loads, making effluents suitable for irrigation or river discharge.
  • The technology is scalable and applicable to both demonstration and full-scale meatworks wastewater treatment scenarios.