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Greywater

  • By: Carl A. Salsedo
  • In: Green Technology: An A-to-Z Guide
  • Edited by: Dustin Mulvaney
  • Subject:Environmental Sciences (general), Environmental Technology, Policy & Management

On a global scale, there is growing apprehension over the declining reserves of groundwater. Mounting demands for water worldwide, with a growing world population and overburdened sewage treatment plants, have kindled interest in the use or recycling of greywater. Greywater derives its name from its cloudy appearance. It is neither whitewater (groundwater or potable water) nor polluted (blackwater) sewage. Any wash water that has been used in the home, except from toilets, is called greywater. Greywater comprises 50–80 percent of residential wastewater generated from all of a home's sanitation equipment excluding the toilets. Greywater is wastewater generated from domestic activities such as laundry, dishwashing, and bathing. The usual sources of greywater are water from bathroom and kitchen sinks, showers, tubs, and washing machines.

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