human waste Maintenance & works
Order ST-08 Station 08/10 Depth −12.1 m

Work order · issued

WO-2604-08

The descent · station 08 of 10

Station
08 / 10
Depth
−12.1 m
Trade
Reframe
Read
4 min

Station 08 Reframe −12.1 m 4 min

The energy plant

London moved its waste to the river in 1858. A plant today takes the same material and returns gas, solids and water.

Scope of work

The solids that settle out of sewage can be digested into gas, power and fertiliser.

An isometric line from a house to a green egg-shaped digester, then three pedestals: a green lightning bolt, a green sprout and a green drop, left to right. PLATE 08A
One load leaves the plant three ways: gas for power, solids for soil, water for the river. AI-generated illustration

Everything that settles out of the water is sludge, and sludge is not the end of the line. In a digester, bacteria break it down and release a gas. The plant burns that gas for heat and power.

What is left still has use. Treated and tested, it leaves the plant as biosolids and goes onto farm soil, carrying nutrients back to the fields that grew the food. Used cooking oil follows a shorter path: collected from restaurant kitchens, it can feed a digester instead of a drain.

Work items

0 / 3 complete
Carry forward

None of this runs without a plant, a truck to reach it, and a city that can pay. Station 09 counts the people who gained a working system between 2015 and 2024.

An isometric soil block cut open, with one young green plant on top and its roots reaching down into a band of small brown pellets below the surface. PLATE 08B
Biosolids are what remains after treatment. The nutrients in them are the reason they go back. AI-generated illustration
At the left, a restaurant kitchen where a pan tips an oil drop into a pipe. The pipe runs right to an egg-shaped digester with a green flame on top. Field concept
The same oil that used to clog the drain now arrives as fuel for the digester. AI-generated illustration

Method statement · illustrative

GreaseCycle

Used oil from restaurant kitchens can be collected and fed to a digester.

  • A sealed bin behind the kitchen takes the oil, and a hauler empties it on a fixed day.
  • The load goes to a digester instead of a drain or a skip.
  • The kitchen gets a record of where its oil ended up.

Illustrative concept, not an existing service. No such product is being announced here.

End of order 08 · station 08 of 10

The plates are AI-generated illustrations, not photographs. Figures come from the companion briefing; depth is illustrative of scale.