Effect of mixing intensity on polymer conditioning of sludges
Conditioning studies were conducted on several water and wastewater sludges using polymers to determine the effect of high-intensity mixing on floc formation and breakup. Mechanisms acting in particle coagulation were also investigated. A rapid mixing apparatus was used in conditioning the sludge to...
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ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-457432021-05-05T05:40:37Z Effect of mixing intensity on polymer conditioning of sludges Bandak, Nazih Civil Engineering Novak, John T. Randall, Clifford W. Knocke, William R. LD5655.V855 1986.B364 Sewage sludge -- Drying Conditioning studies were conducted on several water and wastewater sludges using polymers to determine the effect of high-intensity mixing on floc formation and breakup. Mechanisms acting in particle coagulation were also investigated. A rapid mixing apparatus was used in conditioning the sludge to simulate the high velocity gradients encountered in most dewatering equipment. Anionic and cationic polymers of varying molecular weights and an inorganic coagulant were chosen as the conditioning agents. Dewatering rates were measured by the capillary suction time (CST) apparatus. The effect of rapid mixing on the polymer efficiency was evaluated by premixing the polymer, using the same mixing apparatus, prior to applying it to condition the sludge. Data analyses revealed the great impact the primary floc breakup has on the sludge dewatering rate, although this was shown to be dependent on the nature of the sludge particles. Some minor changes were imparted to the polymer chains by intense mixing but there was no evidence that particle polymer bonds were fractured. The mechanisms of coagulation were observed to be related to sludge type. Overall, successful conditioning of sludges by polymers requires a proper determination of the sludge characteristics, a correct choice of polymer type and dose, and a knowledge of the mixing intensities. Master of Science 2014-03-14T21:49:47Z 2014-03-14T21:49:47Z 1986-07-05 2013-11-15 2013-11-15 2013-11-15 Thesis Text etd-11152013-040418 http://hdl.handle.net/10919/45743 http://scholar.lib.vt.edu/theses/available/etd-11152013-040418/ OCLC# 15178977 LD5655.V855_1986.B364.pdf xi, 123 leaves BTD application/pdf application/pdf Virginia Tech |
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LD5655.V855 1986.B364 Sewage sludge -- Drying |
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LD5655.V855 1986.B364 Sewage sludge -- Drying Bandak, Nazih Effect of mixing intensity on polymer conditioning of sludges |
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Conditioning studies were conducted on several water and wastewater sludges using polymers to determine the effect of high-intensity mixing on floc formation and breakup. Mechanisms acting in particle coagulation were also investigated. A rapid mixing apparatus was used in conditioning the sludge to simulate the high velocity gradients encountered in most dewatering equipment. Anionic and cationic polymers of varying molecular weights and an inorganic coagulant were chosen as the conditioning agents. Dewatering rates were measured by the capillary suction time (CST) apparatus. The effect of rapid mixing on the polymer efficiency was evaluated by premixing the polymer, using the same mixing apparatus, prior to applying it to condition the sludge.
Data analyses revealed the great impact the primary floc breakup has on the sludge dewatering rate, although this was shown to be dependent on the nature of the sludge particles. Some minor changes were imparted to the polymer chains by intense mixing but there was no evidence that particle polymer bonds were fractured. The mechanisms of coagulation were observed to be related to sludge type. Overall, successful conditioning of sludges by polymers requires a proper determination of the sludge characteristics, a correct choice of polymer type and dose, and a knowledge of the mixing intensities. === Master of Science |
author2 |
Civil Engineering |
author_facet |
Civil Engineering Bandak, Nazih |
author |
Bandak, Nazih |
author_sort |
Bandak, Nazih |
title |
Effect of mixing intensity on polymer conditioning of sludges |
title_short |
Effect of mixing intensity on polymer conditioning of sludges |
title_full |
Effect of mixing intensity on polymer conditioning of sludges |
title_fullStr |
Effect of mixing intensity on polymer conditioning of sludges |
title_full_unstemmed |
Effect of mixing intensity on polymer conditioning of sludges |
title_sort |
effect of mixing intensity on polymer conditioning of sludges |
publisher |
Virginia Tech |
publishDate |
2014 |
url |
http://hdl.handle.net/10919/45743 http://scholar.lib.vt.edu/theses/available/etd-11152013-040418/ |
work_keys_str_mv |
AT bandaknazih effectofmixingintensityonpolymerconditioningofsludges |
_version_ |
1719402759793410048 |