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ten thousand liters of waste water per second to the first treatment stage. ten metres further on large pieces of debris are raced out of the sludge. might have been such as toilet paper and other toiletries condoms leaves animal carcasses and anything else that ended up in the sewers then sand traps collect gravel sand and glass shards everything that can t be recycled and up in the incinerator. at the end comes the biological purification stage in a well ventilated and heated environment microorganisms go to work decomposing organic compounds into a mixture of water c o two nitrate bosphorus and sulphate. the cleaning is quite effective here there s hardly any smell. bus. the water is still contaminated with micro pollutants because current sewage

Waste waterAnimal carcassesTreatment stageToilet paperTen thousandGravel sandSand trapsThe endEnvironment microorganismsBiological purification stageNitrate bosphorusSewage treatment