Publication detail
Laboratory Determination of Selected Properties of Activated and Return Activated Sludge
HOUDKOVÁ, L.
Czech title
Stanovení vybraných vlastností aktivovaného a vratného aktivovaného kalu
English title
Laboratory Determination of Selected Properties of Activated and Return Activated Sludge
Type
journal article - other
Language
en
Original abstract
Results are presented from laboratory measurements of viscosity and density of activated and return activated sludge. Solubility of oxygen in sludge liquor was measured and results were compared to solubility of oxygen in pure water. Viscosity measurements show that sludge containing up to 1% dry solids can be considered a Bingham fluid and sludge with dry solids content above 1% should be described using the Herschley-Buckley model. Sludge density is only slightly higher than water density and with increasing dry solids content increases negligibly. The amount of air dissolved in sludge liquor can be calculated using Henry's Law constants for water because the solubility of oxygen in water and sludge liquor differs minimally.
Czech abstract
V příspěvku jsou prezentovány výsledky měření viskozity a hustoty aktivovaného a vratného aktivovaného kalu a měření rozpustnosti kyslíku v kalové vodě. Z měření viskozity vyplynulo, že při obsahu sušiny do 1% je možné popisovat chování kalu Bingamovým modelem, v případě obsahu sušiny nad 1 % je vhodnější Herschley-Buckleyho model. Hustota kalu je v rozmezí sledovaných obsahů sušiny srovnatelná s vodou, resp. mírně vyšší. Pro výpočet rozpustnosti vzduchu v kalové vodě (např. při DAF) je možné použit hodnotu Henryho konstanty, která je tabelovaná pro rozpustnost vzduchu ve vodě. Jak ukázala měření rozpustnosti kyslíku v kalové vodě a demineralizované vodě, rozdíl je minimální.
English abstract
Results are presented from laboratory measurements of viscosity and density of activated and return activated sludge. Solubility of oxygen in sludge liquor was measured and results were compared to solubility of oxygen in pure water. Viscosity measurements show that sludge containing up to 1% dry solids can be considered a Bingham fluid and sludge with dry solids content above 1% should be described using the Herschley-Buckley model. Sludge density is only slightly higher than water density and with increasing dry solids content increases negligibly. The amount of air dissolved in sludge liquor can be calculated using Henry's Law constants for water because the solubility of oxygen in water and sludge liquor differs minimally.
Keywords in Czech
čistírenský kal, viskozita, hustota, rozpustnost kyslíku, flotace
Keywords in English
sewage sludge, density, viscosity, flotation, oxygen solubility
RIV year
2013
Released
01.04.2013
Publisher
DEStech Publications, Inc.
Location
Lancaster, USA
ISSN
1544-8053
Volume
10
Number
2
Pages from–to
77–84
Pages count
7
BIBTEX
@article{BUT100158,
author="Lucie {Houdková},
title="Laboratory Determination of Selected Properties of Activated and Return Activated Sludge",
year="2013",
volume="10",
number="2",
month="April",
pages="77--84",
publisher="DEStech Publications, Inc.",
address="Lancaster, USA",
issn="1544-8053"
}