By Sludge Treatment, Utilization, Reclamation, and Disposal Committee of the Environmental and Water Resources Institute of the American Society of Civil Engineers
The remedy of water and wastewater ends up in the creation of residual solids that has to be dealt with. those solids commonly are centred to minimize the water content material prior to their priceless use or disposal. As those solids are additional processed and dealt with, their intrinsic properties-such as viscosity, rheology, flowability, and texture-change. even though a lot as been written to explain the chemical features of those residuals, in simple terms restricted info has been complied describing their dealing with attribute and acceptable technique of shipping. the target of this handbook is to supply a reference record that the practitioner can use to figure out the dealing with features of residuals and to pick acceptable conveyance structures. The monograph has been equipped into 9 chapters.
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Freezing changes both the structure of the residuals' slurry and the characteristics of the solids themselves. In effect, the solid matter tends to be compressed into large, discrete conglomerates surrounded by frozen water. When thawing occurs, these large, discrete conglomerates remain. An almost pure alum residual is the most difficult to dewater, especially on mechanical dewatering equipment. On belt filter presses, it must be dewatered at low pressures, achieving only about 15-20% solids. If the source of the water were a silty river supply, the resulting slurry would be easier to dewater.
Straight radial ribs can be cast on the inside surface of the discs for high head conditions. This option brings the pump closer in design and operation to a recessed impeller. 47 m3/s (7,500 gal/min). Horizontal close-coupled and frame-mounted styles are available, as well as submersible and vertical cantilever models. Operational Features and Considerations. The main advantages of disc pumps are claimed to be the following: • Low wear rate in abrasive service. The stationary boundary layer is claimed to protect the pump discs from impact abrasion.
1980). Review of the role of colloidal forces in the rheology of suspensions. /. Rheol, vol. 24, no. 3, pp. 287-317. J. (1985). , Butterworths, London. Smollen, M. (1988). Moisture retention characteristics and volume reduction of municipal sludges. Water SA, vol. 14, no. 1, p. 25. Smollen, M. (1990). Evaluation of municipal sludge drying and dewatering with respect to sludge volume reduction. In: Proceedings of the IAWPRC Specialty Con- 32 CONVEYANCE OF RESIDUALS FROM WATER & WASTEWATER TREATMENT ference on Sludge Management, International Association of Water Pollution Research and Control, London.