ABSTRACT
M.A.HILSON,C.Chem.,F.R.I.C.,F.I.W.E.S. PrincipalScientist,WaterTreatmentandSupply,NorthWestWater
Authority,Warrington,UK
Thevarioustypesofsludgearisingfromwatertreatmentprocessesare consideredandthisisfollowedbyaconsiderationofdisposalmethods.The methodsofwatertreatmentplantoperationaimedatproducingthe minimumvolumeofsludgeforsubsequenttreatmentarethendiscussed.The dewateringofsludgeisconsideredastwoseparateprocesses:initial thickeningorincreaseinconcentrationtominimisethesizeoftreatment equipmentrequiredfollowedbyareviewofthevariousmethodsavailablefor furtherdewatering.Recentlyintroducedwatertreatmentprocessesarethen consideredwithparticularreferencetotheirimpactonsludgetreatment. Quantitiesofsludgearisingandoperationalproceduresforsludgetreatment installationsarethendealtwith.
