Conveyance of Residuals from Water and Wastewater Treatment by Sludge Treatment, Utilization, Reclamation, and Disposal

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 leads to the construction of residual solids that has to be dealt with. those solids in general are targeted to lessen the water content material sooner than their worthwhile use or disposal. As those solids are extra processed and dealt with, their intrinsic properties-such as viscosity, rheology, flowability, and texture-change. even if a lot as been written to explain the chemical features of those residuals, in simple terms constrained details 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 applicable conveyance platforms. The monograph has been geared up into 9 chapters.

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The volatile suspended solids (VSS) concentrations in this situation can decrease to about 60%. However, even though the influent VSS is lower, there still may be as much or more primary sludge produced on that day. Because the lower VSS concentration probably indicates a high proportion of inorganics, grit production is usually higher. Secondary Sludge Secondary sludge is the product of the aerobic, biological conversion of biochemical oxygen demand (BOD). It also contains non-biodegradable SLUDGE SOURCES, COMPOSITION, AND CHARACTERISTICS FIGURE 3-1.

10, pp. 3-25. , and E. Weisberg (1956). Bound water and activated sludge bulking. Sewage Ind. Wastes, vol. 28, no. 4, pp. 558-574. C. (1986). Principles of Colloid and Surface Chemistry. , New York. Hsu, C-C. (1992). S. Thesis, Department of Civil and Environmental Engineering, Duke University, Durham, NC. , and A. Kouzeli-Katsiri (1987). Bound water content of biological sludges in relation to filtration and dewatering. , vol. 24, no. 11, pp. 1319-1327. , and }. Ganczarczyk (1991). Size distribution of activated sludge floes.

Polymer produces a large, strong floe that allows free water to drain easily from the solids in the gravity drainage zone of the belt filter press. With centrifuges, polymer improves centrate clarity, increases capacity, often improves the conveying characteristics of the solids being discharged, and often increases cake dryness. For optimum performance in alum, residuals usually require a cationic polymer; carbonate SLUDGE SOURCES, COMPOSITION, AND CHARACTERISTICS 49 residuals usually require an anionic polymer.

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