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Nutrient removal from farm effluents.

N S Bolan1, L Wong, D C Adriano

  • 1Soil and Earth Science Group, Institute of Natural Resources, Massey University, Palmerston North, New Zealand. n.s.bolan@massey.ac.nz

Bioresource Technology
|June 9, 2004
PubMed
Summary

Dairy farm effluent treatment using a two-pond system showed poor nutrient removal. However, zeolite and bark effectively trapped nitrogen, phosphorus, and potassium for potential recycling.

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Area of Science:

  • Environmental Science
  • Agricultural Engineering
  • Water Treatment

Background:

  • Dairy farm effluent poses environmental risks due to high nutrient content.
  • Conventional two-pond systems may not adequately remove nutrients like nitrogen and phosphorus.
  • Effective nutrient management is crucial for preventing water pollution from agricultural runoff.

Purpose of the Study:

  • To evaluate nutrient removal efficiency in a two-pond dairy farm effluent treatment system.
  • To develop an affordable and reusable nutrient trap for dairy effluent.
  • To assess the potential of porous materials (zeolite and bark) as nutrient traps.

Main Methods:

  • Monitoring of chemical oxygen demand (COD), biological oxygen demand (BOD), nitrogen (N), phosphorus (P), and potassium (K) over 7 months.
  • Laboratory batch experiments using zeolite and bark for nutrient retention.
  • Pilot-scale field experiments utilizing bark for nutrient removal.

Main Results:

  • The two-pond system demonstrated limited effectiveness in removing nutrients from dairy effluent.
  • Both zeolite and bark materials showed high efficiency in removing N, P, and K from the effluent.
  • Nutrient-enriched materials are suitable for recycling as nutrient sources or soil conditioners.

Conclusions:

  • Biological treatment in the studied two-pond system is insufficient for preventing nutrient pollution.
  • Zeolite and bark are effective and inexpensive materials for trapping nutrients in dairy effluent.
  • Implementing these porous materials in the aerobic pond can significantly improve effluent quality before discharge.

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