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Living Machine

1980
  • John Todd
  • Nancy Jack Todd
Ecological wastewater treatment system with diverse ecosystems for water purification.

A patented form of ecological wastewater treatment and water reclamation system developed by Dr. John Todd. It uses a series of diverse ecosystems, including bacteria, algae, plants, snails, and fish, within controlled environments like tanks or greenhouses, to purify water. The system mimics the natural purification processes of wetlands and other aquatic ecosystems but in an intensified, engineered setting.

A Living Machine, also known as an Eco-Machine, is an advanced ecological engineering system for treating wastewater. It was pioneered by biologist John Todd at the New Alchemy Institute. Unlike conventional chemical or mechanical wastewater treatment plants, a Living Machine employs a complex, self-organizing web of living organisms to perform the purification. The process typically involves a series of tanks or cells, each containing a distinct ecosystem tailored to a specific stage of treatment.

Wastewater flows sequentially through these cells. The first stages often involve anaerobic and anoxic tanks where microbes break down solids and organic compounds. Subsequent stages are aerobic, housed in clear tanks or greenhouses to allow for photosynthesis. These tanks contain a diverse array of plants (like water hyacinths or cattails) whose roots provide vast surface area for beneficial bacteria and microorganisms. Snails, amphipods, and other invertebrates graze on algae and biofilms, while fish may be introduced in later stages to consume smaller organisms. The result is a robust, resilient system that can effectively remove pathogens, nutrients, and organic pollutants, producing high-quality reclaimed water suitable for non-potable uses like irrigation or toilet flushing.

UNESCO Nomenclature: 3305
– Environmental engineering

Type

Physical Device

Disruption

Substantial

Usage

Niche/Specialized

Precursors

  • studies of natural wetland ecosystems and their purification capabilities
  • kathy seidel’s research on bulrushes for water purification in germany (1960s)
  • h.t. odum’s work on ecosystem ecology and energy flows
  • advances in microbiology and understanding of microbial consortia
  • the environmental movement’s push for alternatives to chemical-intensive technologies

Applications

  • oberlin college’s adam joseph lewis center for environmental studies
  • findhorn foundation eco-village in scotland
  • port of portland headquarters, oregon
  • esalen institute, california
  • daxing eco-farm, beijing, china

Patents:

  • US4789470A
  • US5087353A
  • US5486291A

Potential Innovations Ideas

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Related to: living machine, john todd, ecological engineering, wastewater treatment, bioremediation, constructed wetland, eco-machine, phytoremediation, new alchemy institute, water purification.

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Historical Context

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