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Related Experiment Videos

The under sink garbage grinder: a friendly technology for the environment.

D Bolzonella1, P Pavan, P Battistoni

  • 1Department of Science and Technology, University of Verona, Strada Le Grazie 15, I-37134 Verona, Italy.

Environmental Technology
|April 22, 2003
PubMed
Summary

Garbage grinders enhance wastewater treatment by increasing the carbon-to-nitrogen ratio, aiding nutrient removal. This technology offers environmental benefits and potential cost savings for households.

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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Wastewater Treatment

Background:

  • Garbage grinders are common in North America, Japan, and Australia, but not widely used in Europe.
  • Concerns exist regarding potential negative impacts on sewers and wastewater treatment plants, leading to prohibitions in some regions.
  • This study investigates the often-overlooked positive impacts of garbage grinder technology.

Purpose of the Study:

  • To evaluate the effects of household organic waste disposal via garbage grinders on wastewater characteristics.
  • To demonstrate the advantages of garbage grinders for wastewater treatment processes, particularly biological nutrient removal.
  • To assess the economic and environmental implications of using garbage grinders.

Main Methods:

  • Quantified daily specific contributions of carbon (COD), nitrogen (N), and phosphorus (P) per person equivalent (PE) from garbage grinder waste.

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  • Determined the resulting chemical oxygen demand (COD)/N ratio in wastewater.
  • Monitored sewer systems for solids settling issues.
  • Conducted an economic analysis comparing grinder use to traditional waste disposal.
  • Assessed environmental benefits including nutrient removal and biogas production.

    • Main Results:

    • Garbage grinders increase the carbon/nutrient ratio in wastewater, with specific contributions of 75 gCOD/PE/day, 2.5 gN/PE/day, and 0.25 gP/PE/day.
    • The resulting COD/N ratio was found to be 30, which is beneficial for biological nutrient removal processes.
    • No significant issues with solids settling in sewers were observed.
    • An estimated annual saving of 17 Euros per three-person family was calculated.
    • Positive environmental impacts include improved organic waste disposal, enhanced nutrient removal, and increased biogas production for energy recovery.

    Conclusions:

    • Garbage grinders offer significant advantages for wastewater treatment, particularly in enhancing biological nutrient removal.
    • The technology presents a viable option for household organic waste management with positive economic and environmental outcomes.
    • Further adoption of garbage grinders could improve wastewater treatment efficiency and resource recovery.