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Showing 1 to 20 of 40 for “"sludge dewatering"”.
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Conditioning for shear in sludge dewatering
… how chemical conditioning agents and mechanical dewatering devices affect sludge dewatering with respect to shear. Bench scale experiments were performed to determine the effect of shear and mole charge on polymer dose requirements using anaerobically digested sludge. Lime, ferric chloride, and …
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Municipal sludge dewatering using a belt filter press
… anaerobically digested and aerobically digested sludges to determine the optimum polymer conditioning for a belt filter press The optimum polymer dosages for all three zones of a belt filter press were compared with each other to determine the best overall conditioning. The requirements of all …
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Polymer dose prediction for sludge dewatering with a belt filter press
… to examine the polymer mixing requirements for sludge dewatering with a belt filter press. This involved correlating full-scale field studies to small scale laboratory testing. Bench testing involved the use of a high-speed mixer and two sludge dewatering response tests: the capillary suction …
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The role of bound water content in defining sludge dewatering characteristics
Several available methods of measuring sludge bound water content in the laboratory were examined. The effect of polymer conditioning on the bound water content of biological sludge samples was measured using the dilatometric method. The effects of mechanical dewatering on the bound water content …
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The role of floc density measurements in analyzing sludge dewatering characteristics
… may play a significant role in analyzing sludge dewatering characteristics. A laboratory technique was developed to measure this property by means of isopycnic centrifugation. Four laboratory sludges were subjected to a series of dewatering tests: gravity thickening, centrifugation, vacuum …
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Laboratory evaluation of conditioning requirements for sludge dewatering using belt filter press
… pressure during the expression stage of a dewatering process. Bench-scale experiments performed with anaerobically digested, alum, and secondary sludges used a high-speed mixer to gauge mixing intensity effects, and a wedge zone tester to gauge applied pressure effects on conditioning …
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Floc density measurement and the effects of microproperty variations on sludge dewatering characteristics
The dewatering characteristics of sludges produced by water and wastewater treatment plants bear heavily on the methods chosen to treat and dispose of the sludge, as well as on the costs associated with handling the large volumes of sludge produced at these facilities. This study investigated why …
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Determination Of Optimum Polymer Dose For Grand Forks Wastewater Treatment Plant Lagoon Sludge Dewatering
… is currently sending its waste activated sludge (WAS) from the activated sludge treatment process to an existing on-site wastewater treatment lagoon which has been in operation since 2003. The plant produces approximately 65,000 gallons of WAS per day. Because of this high level of …
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The effect of polymer dose and mixing intensity on sludge dewatering with a plate and frame filter press
… were performed with anaerobically digested sludge and a plate and frame filter press to determine filter press performance over a range of polymer doses and under a variety of sludge and polymer mixing conditions. In addition, bench-scale polymer dosing and mixing experiments were conducted …
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Comparative study of sludge dewatering and thickening characteristics for biological phosphorus removal process and conventional activated sludge process sludges
Due to the unpredictable nature of sludges, it is imperative to test a sludge from every new process in order to design the sludge handling equipment properly. In this study, sludge from the Virginia Initiative Plant, a pilot scale unit employing the UCT biological nitrogen and phosphorus removal …
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Biopolymer and Cation Release in Aerobic and Anaerobic Digestion and the Consequent Impact on Sludge Dewatering and Conditioning Properties
Sludge dewatering and chemical conditioning requirements were examined from the perspective of biopolymer and cation release from activated sludge flocs. Both aerobic and anaerobic digestion processes were considered from two different activated sludge sources at a temperature of 20° C. Polymer …
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The effect of varying several operational parameters on the dewatering characteristics of activated sludge
… parameters and their effect on activated sludge settling and dewatering rates. Several laboratory scale reactors were used in this study and fed with various synthetic substrates. The sludges produced from these reactors were used to examine sludge settling and dewatering characteristics …
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The effect of cation addition on the settling and dewatering properties of an industrial activated sludge
… of cation addition on an industrial activated sludge system and to determine the applicability of the findings of a previous VPI&SU doctoral student (Higgins, 1995) to this industrial sludge. From this research, the implications on the full-scale industrial wastewater treatment system could be …
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Bacterial extracellular polymers and flocculation of activated sludges
… in the treatment line such as sedimentation, sludge thickening, and sludge dewatering depends on the extent of this bacterial flocculation. In this research, sludge samples from under various substrate conditions were examined for type, molecular weight, physical characteristics„ and quantity …
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Predicting and Improving the Dewaterability of Waste Activated Sludge Through Moisture Distribution Analysis
The dewatering of waste activated sludge is one of the most costly and least understood operations in wastewater treatment. While much effort has been put into streamlining operation of sludge dewatering equipment to maximize moisture removal, until recently, little attention was paid to the water …
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Effects of storage on water treatment plant sludges
The effects of in-basin storage of sludge on the iron, manganese, and TOC removal of water treatment plant (WTP) clarifiers and on the dewatering characteristics of sludge were examined. The use of chlorine dioxide as a preoxidant to retard observed detrimental effects was also investigated. Sludge …
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The effect of certain sludge floc properties on the dewatering characteristics of biological and chemical waste sludges
… and economical problems associated with sludge handling and disposal have significantly increased in the past years due to: (1) the introduction of more stringent water and air pollution regulations, often requiring the use of processes that produce large quantities of sludge as …
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An investigation of laser light scattering for the measurement of micron size particles with application to bioflocculation
The activated sludge wastewater treatment process depends upon the formation of biological floc for effective liquid-solids separation, nutrient stabilization and sludge dewatering. Continued research into floc formation, intrafloc interactions and floc hydrodynamics is necessary for improved …
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Thermal hydrolysis and thermal alkaline pretreatment of waste activated sludge: comparison of effects on biogas yield, dewaterability, sludge liquor and cost-benefit analysis
… and thermal hydrolysis (TH) of waste activated sludge (WAS) on biogas yield increase, dewatering potential of digestate, return load increase and refractory COD using same sludge. Moreover, it was intended to compare economic viability of TAP and TH for an individual wastewater treatment plant …
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Characterization of sludges produced when using polyaluminum chloride coagulants
The dewatering characteristics of polyaluminum chloride (Hyper⁺Ion 1050A) sludges were investigated using lab-scale tests including specific resistance to filtration (r*), capillary suction time (CST), and sludge pH. The effects of chemical conditioning (lime and cationic polymer) and mixing …
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