[In62] Waste Recycling

AUTHOR: Natalia Andriotis

Domestic Recycling

Domestic Water RecyclingProduction RecyclingSewage Treatment


Scenario Games: Action Plan:


Local Councils; London Development Agency; Thames Water; Beckton Sewage Works; Housing Associations _____________________________________________________________________________________________________________


Using mains water to supply all our water needs is needlessly wasteful, both financially and environmentally. Mains water is expensively purified to drinking water standards - but much of the water is used for non-potable purposes, like flushing toilets, cleaning and gardening. Harvested rainwater can be substituted for mains water, saving money and contributing to the protection of a key natural resource.

On-site wastewater re-use provides numerous opportunities to reduce water use within the home. At present, potable water is used for practically everything in the house and garden. With water reuse gaining popularity, people increasingly consider greywater from their residences as a resource to be separated from the wastewater stream and re-used in their landscapes. Such re-use of greywater reduces the amount of wastewater entering sewers or on site wastewater treatment systems, reduces demands to use potable water for other residential uses like irrigation and helps preserve limited water supplies for essential uses like human consumption.

Residential wastewater can be divided into blackwater and greywater. Greywater is water discharged from showers/baths, sinks and washing machines. Blackwater contains relatively higher concentrations of nitrogen, organic matter and human pathogens than greywater. Blackwater includes flush water from toilets and urinals and wastewater from food preparation sinks.

Toilet water can be treated with technologies such as non-discharging toilets (incinerating and composting) or can be directed to a separate on site wastewater treatment system. Once separated, greywater can be diverted for reuse, such as for landscape irrigation, or it can be directed first to an on site wastewater treatment system for further treatment.
How can wastewater recycling become a compulsory component in new developments and how can this be incorporated along with other technologies such as hydroponic systems for the localised farming systems?