Which type of sludge is generally more expensive to haul away?

Belt Filter Press sludge is generally more expensive to haul away due to its higher water content and the energy required to transport it. This type of sludge is often denser and can require specialized handling techniques and equipment for transportation to disposal sites. The process of dewatering via a belt filter press removes some water but not enough to make it cost-effective for disposal compared to more dewatered options, such as sludge from a drying bed.

Other types of sludge, like primary sludge, are typically less complex to handle and process, while drying bed sludge often has already been significantly reduced in water content, making it more economical to transport. Final effluent sludge is even less substantial since it mainly consists of contaminants that have already been treated and discharged, further diminishing transport costs. Thus, the combination of moisture content and handling requirements contributes to the higher cost associated with hauling Belt Filter Press sludge.