if you are feeling very committed, sewage works do run open days and educational trips for children occasionally
dp says he vividly remembers "the sweetcorn skip" from such a trip when aged about 8
this was all the bits that didn't break down in the treatment process, that had been filtered out of the water and it was about 99% sweetcorn. A skip full. Honest.
he likes to remind me of this often (I am rather fond of sweetcorn). He says it is unecological of me.