Waste Management

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

By Sludge Treatment, Utilization, Reclamation, and Disposal Committee of the Environmental and Water Resources Institute of the American Society of Civil Engineers

The therapy of water and wastewater leads to the construction of residual solids that needs to be dealt with. those solids in general are centred to lessen the water content material sooner than their worthwhile use or disposal. As those solids are additional 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, purely constrained info has been complied describing their dealing with attribute and applicable technique of shipping. the target of this guide is to supply a reference rfile that the practitioner can use to figure out the dealing with features of residuals and to choose applicable conveyance structures. The monograph has been geared up into 9 chapters.

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Extra resources for Conveyance of Residuals from Water and Wastewater Treatment

Sample text

The relationship can be defined mathematically as (2-3) K is defined as a fluid consistency index, and n is the flow behavior index, which has a value less than unity. In flocculated systems or in systems with fairly large but fragile particles, pseudoplastic behavior is evident when the aggregates (the large particles) are reduced in size as the shear rate is increased. The increased shear rate reduces the amount of the carrier liquid that is immobilized by the particles and thus reduces the viscosity.

2 \im) in size. 9 x 10~5 in. [«1 j^im]), additional colloidal forces become important. One of these is the thermal energy that causes the rotational and translational diffusion of the particle. Rotational movement affects the position, orientation, and distribution of particles and, hence, the mechanical properties of sludge (Mewis, 1980). As a result of all the forces on colloids, a net attractive or repulsive interaction occurs between the particles, and depending on which predominates, either the particles stay flocculated or the suspension remains stable.

Disc Pumps Disc pumps are a relatively recent development in sludge pumping. These patented pumps utilize a series of parallel discs rotating within a pump volute (Figure 4-4). As the parallel discs rotate, the boundary layer and viscous drag effects move the liquid through the pump. Design features. " The discs are stacked together and held in position by spacers. The number and spacing of the discs are determined by the pump manufacturer and are related to the flow and pressure specified, as well as to the OVERVIEW OF RESIDUALS CONVEYANCE DEVICES 57 FIGURE 4-4.

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