Characterization and dewaterability of water treatment plant residues
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Abstract
A variety of water treatment residues were characterized in order to determine the influence of specific chemical constituents, process flow schemes and raw water quality on the performance of sludge dewatering processes. The use of conventional sludge characterization parameters for process selection and design was evaluated by comparing process yields to sludge characteristics. The extent of dewatering was determined for four sludge dewatering methods and the physical properties of chemical sludges at varying solids levels compared to process performance to determine which of the processes produces a 'handleable' sludge. In this study the draining and drying rates of chemical sludges applied to sand beds were related to several sludge characteristics. It was found that the time to drain was related to the sludge specific resistance, applied depth and solids concentration. Air drying occurred in two distinct phases. The initial or slow drying phase was governed by the sludge cake depth and drained solids concentration while the rapid drying rate was found to approximate the free surface water evaporation rate. Sludges with a coefficient of compressibility less than 0.7 were found to penetrate into the sand bed.
This material is based upon work supported by the U.S. Geological Survey and the Missouri Water Center under the Grant/Cooperative Agreement.
The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey or Missouri Water Center. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey or Missouri Water Center.
This material is based upon work supported by the U.S. Geological Survey and the Missouri Water Center under the Grant/Cooperative Agreement.
The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey or Missouri Water Center. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey or Missouri Water Center.