- Otherfiltersandchemical"scrubbers"catchoxidesofsulphurandnitrogenthatwouldotherwisecauseacidrain.Thereportalsofoundthatsmokestackscrubbersandotherequipment,whichaccountedforupwardsofone-thirdoftotalplantexpensestooperate,wereidledtosavecosts.IntheU...
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