One of the big problems is that towns and villages have grown massively in the last 20 years, with housing estates and smaller developments mushrooming on both brownfield and greenfield sites. This increase in sewage production, is rarely matched by a corresponding upgrade of the municipal sewage works, resulting in overloading and pollution problems. Wet weather makes it dramatically worse as raw sewage is discharged into storm drains - which discharge into rivers - as a coping mechanism. The Water Companies do not have the resources to upgrade surface and sewage drains and works every time a new planning permission is granted and the Planning Departments hardly ever enforce it as a requirement. If every new house treated its own sewage, discharging only clean water to the surface water drains, then this problem would be eliminated.
The average CO2 emission from a single house sewage treatment is over 0.5 tonnes per year. An acre of woodland absorbs 2.6 tonnes per year. If the UK adopted non-electric, decentralised sewage treatment it would save the equivalent of 46,000 acres of woodland (over half the size of The New Forest) CO2 absorbtion capacity.
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