Liquid filtration sludge dewatering

Liquid-liquid and solid-liquid phase separations are achieved that produce sludges that are more easily filtered compared to chemical flocculent addition. This technology enhances the filtration and dewatering rates of solids removed from an effluent. The vendor states that this technology is commercially available however, the technology has not been demonstrated at full scale for Superfund site remediation. 

After thickening, a variety of sludge handling and disposal options are available. For example, the thickened sludge can be applied directly to land. If liquid disposal is not applicable to a specific project, the thickened sludge can be dewatered by centrifugation, vacuum filtration, or filter pressing. The dewatered residue can then be land fill or incinerated. These options are discussed further on. 

Liquid wastes containing metals other than chromium (VI) require direct precipitation. After precipitation, the metal precipitates are separated by gravity settling, clarification, and/or filtration. The sludges are subsequently dewatered before disposal. 

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