WASTEWATER GARDENS®
  Constructed Wetlands              


Humedales Artificiales
    (WWG)

JARDINES DEPURADORES DE AGUAS RESIDUALES

          JARDIN D'EPURATION DES EAUX USEES

Zones Humides Artificielles
 Schools
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Overview
Introduction - understanding sewage water
The Technology & Legal Compliance
Water Treatment Levels & Treated Water Usage
Sound Economics of WWG - Using WWG as economic incentives
Advantages of WWG: an ideal solution
Important Design Factors and Maintenance
 
Construction and installation Process
Our commitment & expertise
The Planetary Coral Reef Foundation (PCRF)
What people say about WWG
Project references

Overview downloads

Photos and applicability in...
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Scientific Papers
 
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The Sound Economics of Wastewater Gardens®


Cost reduction and longer life-time

  • While initial investment and installation of constructed wetlands may be equal or higher than some conventional sewage treatment plants (STP - See *) (or over 50% lower), depending on the country, labour cost, materials, on the type of plants chosen (mature or budding at start of operation) as well as on the nature of the project, operating and maintenance costs are typically 90-95% lower than for high-tech, mechanically based STPs (see *)
    * There are different types of conventional STPs (Sewage Treatment Plants). On a small scale, compact system are increasingly available, with an enhanced septic tank system (2 or several chambers, in some cases with an air pump to accelerate oxygenation) and on a larger scale STPs often provide treatment by Extended Aeration Biological Systems, Activated Sludges, RBC, and Hybrid systems), with a different cost for each system.
    For example: Extended Aeration Systems costs around 15% less that Biological Systems in installation, while running costs are typically around 10 times more expensive.

    • While different types of conventional STPs have varying initial capital costs and maintenance expenses, all have much higher operating and refitting/repair expenses (conventional STPs typically need refitting after 5-10 years of service).
    • WASTEWATER GARDENS® have a life cycle of minimum 20 years, which is 2-3 times that which might be expected of an STP, especially in tropical conditions; most conventional sewage treatment systems will have a lifetime of at best 10 years, after which time significant or complete parts replacement must be considered.

  • Being natural systems, there are no monthly and/or yearly costs of expensive chemical additives, while WWG systems also provide insurance against inflation of maintenance costs (parts, electricity, service, chemicals, etc.).

  • WWG systems are designed to rely completely on gravity-flow, with little or no machinery being used; costs of pumps, electricity, replacement of parts and technician labor for maintenance are removed, unless natural gravity doesn't allow free flow of water.

  • In addition to sewage water treatment and ability to release into the environment purified water, the WASTEWATER GARDENS® can supply part or all of the landscaping needs without need of additional potable water or fertilizer - part or all of the landscape being watered by otherwise wasted water -, which in some sites can represent significant financial savings.

  • The discharge water from the WWG being much lower in organic compounds (BOD) and suspended solids, problems with important quantity of water having to be released into the environment, with attendant problems of soils absorption capacity in the leachfields, are greatly reduced ; WWG discharge water will much less likely clog soils and leachdrains remain effective for a much longer time, sometimes indefinitely.

Using constructed wetlands / WWG systems as an economical incentive