What happens to the sludge from sewage works?

I know the water gets taken out and treated but what about all the other stuff left behind?

It's turned into Muesli.

It gets treated by bacteria which decompose it

The organic waste gets pasteurised to kill the bugs, dried, compressed, then sold to farmers (I say "sold" ... they only really pay the transport costs) who spread it on their fields. It's all safe and doesn't smell.

The inorganic waste (cotton bud stems and all the other rubbish people flush away) ends up as land-fill.

Its actually heated, turnen into little pellets,then used as fertilizer.

When the water is removed its squeezed into large flat sheets which are given to farmers to spread on their fields! Apparently, its full of nutrients! Still want to be vegetarian?

Big Macs.

it gets cleaned

It's turned into fertiliser and spread on land to fertilise crops.

There are three main types of solids present. Two types come from the sewers and the third is grown at the wastewater plant.

What comes from the sewer is divided into large materials that can be screened out with a bar screen (looks sort of like a jail cell door, alittle narrower between bars). This includes wood, toys, diapers, and other very large things, with some toilet paper. This material is separated and landfilled.

The majority of the toilet paper and human waste goes into the treatment plant, is broken down into the soluble form, and turned into harmless materials that are soluble in the water by the bacteria in the treatment plant. Some will just stick to the bacteria.

These bacteria that grow naturally in the treatment plant are the third type of solids. The oldest are cycled out and collected. The amount can be reduced by several digestion methods. The remains can be landfilled, incinerated, or used as fertilizer.

It is much more complicated than this simple summary. For more info, see the references.