Screen Bowl Centrifuge Dewatering Process: A Parameteric Study

Mohanty, Manoj Kumar

doi:10.1155/2007/70376

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…In world practice, there is a tendency to increase the specific gravity of the use of mechanical methods for dewatering sludge and sewage sludge of various origins [3]. This is due to the continuous increase in the cost of energy resources and the corresponding rise in price of alternative mechanical -thermal dehydration methods [4].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Floccular Cleaning and Drainage of Thin Dispersed Sludges

Shestopalov

Briankin

Rykusova

et al. 2020

EUREKA: Physics and Engineering

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The efficiency of solid phase retention and dehydration of finely dispersed products of a coal processing plant and a metallurgical enterprise on the module for cleaning and dewatering sludge is investigated. A technique for selecting the operating parameters of equipment based on the determination of the strength criterion of flocs is proposed. A methodology for technological tests has been developed to control the flocculation process and optimize the flow of flocculant depending on the concentration of the solid phase. Industrial tests on the module for wastewater treatment and sludge dewatering using flocculants proved the effectiveness of the developed methodology. It is shown that the conditions for conducting tests on flocculation should correspond to the operating conditions of the circuit apparatus for cleaning and dewatering sludge. These conditions include sludge performance, sludge flow rate in the cross section of pipes and apparatuses, and the flow time from the flocculator to the centrifuge. During the testing of the Module, the solids retention efficiency of 97–99 % was achieved with the strength criteria of flocs in front of a centrifuge of 2–2.5 mm/s. The conditions for the high efficiency of the apparatus chain are the optimization of the aggregation process itself. It is revealed that for the formation of strong flocs it is necessary to regulate the concentration of the solid phase. For coal sludge, the concentration of the solid phase before the flocculant is fed must be maintained no higher than 50–60 g/l, and for gas treatment sludge – no higher than 20–25 g/l. Correction of the concentration of sludge before the flocculator is possible by diluting it with clarified water to the optimum concentration for aggregation. It is found that the moisture content of the sediment and the efficiency of the retention of the solid phase depend on the strength criterion of the flocs. Therefore, the optimization of the flocculant flow rate is possible by controlling and the residual floccule deposition rate after mechanical action in front of the dewatering equipment. The flocculant flow rate must be adjusted depending on the concentration of the solid phase in the sludge to achieve the desired criterion for the strength of the flocs

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Section: Introductionmentioning

confidence: 99%