Anglian Water treats the wastewater and sewage from over 5 million customers a day. The sewage treatment works are connected by over 32,000 km of pipe work.
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Bacteria can be added to the tanks in the same way you would add worms to a compost heap. They get to work on the sludge and begin to break it down. In the past all the sludge would have been dumped at sea, but now this is illegal. The sludge can be dried to produce bio solids. Over half is put on agricultural land.