The facility should send the semisolid sludge through a dewatering process (filter press) so that they do not waste money or energy to destroy the sludge in their disposal process. There is no logical action that the facility would send their sludge out of the facility in a semi-solid form, without reducing/removing the water from the sludge,
Here in this question, the sludge moisture testing needs to be done as per ZDHC guidelines on sludge testing, kindly follow the requirement if you are generating Industrial sludge.
If they want further clarification, please send us your recent sludge testing report, so that we can provide a more detailed answer if needed.