Imashini itwara amazi yo mu bwoko bwa spiral ni uburyo bwo gutunganya amazi, bukoreshwa cyane mubikorwa byo gutunganya amazi y’amazi ya komine, peteroli, inganda zoroheje, fibre chimique, gukora impapuro, imiti, uruhu nizindi nganda.Igikorwa nyirizina cyerekana ko sludg ...
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