Council leader Nick Ireland said: “The addition of such a range of other waste types will alter the profile of the waste, the incineration process, combustion gases and bottom ash.
“The transport of additional waste types to the site are likely to result in additional HGV movements.
“The storage of such wastes on the site will lead to additional odour and nuisance.”
He added: “The whole process associated with the decision-making of the incinerator has felt arbitrary and totally out of kilter with community needs.”
A Powerfuel Portland spokesperson said: “We note that the Environment Agency, not Dorset Council, is the appropriate authority that has the technical expertise for determination of matters including public health, odour and waste profile.
“The volume of HGV movements will remain within the planning permission that was granted by the Secretary of State and the proposed minor amendment will not impact this.”
Permission for the incinerator was rejected by Dorset Council in 2023 but the decision was overturned by the government in 2024 following an appeal.
A legal challenge by campaigners was dismissed by the Court of Appeal in November.