Effect of solution physical chemistry on the rheological properties of activated sludge

Download

index.pdf

Date

2002-04-01

Author

Sanin, Faika Dilek

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

30
views

0
downloads

Knowledge on rheological properties of sludge is important for the design of pumping and transport facilities and as a tool in process control during treatment. Concentrated activated sludge is known to behave as a non-Newtonian material. The contribution to non-Newtonian behaviour is believed to originate from the colloidal properties of solids more than from the molecular properties of the suspension. Considering that the colloidal proper-ties of sludge depend on factors like pH, conductivity. solids concentration and flocculation properties. this study examines the effects of these variables on the theology of activated sludge. Results show that the rheograms obtained fa best to a power law model indicating that the flow of activated sludge can best be expressed by the pseudoplastic flow model. It is also observed that the apparent viscosity increases sharply with the increase of solids concentration. From the pH values studied, the one that causes the lowest viscosity is the pH 5.5. As the pH increases, the viscosity measured increases considerably. This makes sense considering that the isoelectric point of bacteria is at pH 2-4. Conductivity is also found to affect the viscosity greatly; such that a the conductivity increases, the apparent viscosity decreases. Finally, experimental results reveal that the presence of extracellular polymers and the flocculated nature of activated sludge affect its viscosity.

Subject Keywords

Sewage-sludge, Surfaces

URI

https://hdl.handle.net/11511/46834

Journal

WATER SA

DOI

https://doi.org/10.4314/wsa.v28i2.4886

Collections

Department of Environmental Engineering, Article

Suggestions

OpenMETU
Core

The effect of explicit method of problem solving accompanied with analogies on understanding of mole concept Ünlü, Yalçın; Geban, Ömer; Department of Secondary Science and Mathematics Education (2006) The aim of this thesis was to analyse the effectiveness of explicit method of problem solving accompanied with analogy instruction over traditionally designed chemistry introduction on understanding of mole concept and attitude toward chemistry as a school subject. Participants for this research consisted of 53 students at ninth grade level from two classes taught by the same teacher in Atatürk Anadolu Lycee. The study was carried out during the second semester in the 2004-2005 school year. During the treat...
Effect of triisopropanol amine and calcium nitrate on the strength development of glass fiber reinforced concrete t Alkılıç, Mustafa Onur; Yaman, İsmail Özgür; Öztürk, Abdullah; Department of Cement Engineering (2015) This thesis work aims to research the possibility of acceleration in strength development by the use of Calcium Nitrate (Ca(NO3)2) and Triisopropanol Amine (TIPA) in the production of glass fiber reinforced concrete, also known as GFRC or GRC. In conventional cementitious systems, Ca(NO3)2 is used as an accelerator, and TIPA is typically used as a grinding agent for cement. In this thesis study TIPA is used in order to increase the ultimate strength of the concrete whose early strengths are increased by Ca(...
Effect of EDTA on activated sludge properties Sanin, Faika Dilek (2001-02-01) Bacterial extracellular polymers have been found to be important in bioflocculation of activated sludge. In this study ethylene diamine tetra acetic acid (EDTA) method of extracting bacterial extracellular polymers is examined. Following extractions, it is observed that EDTA extracted significant amounts of biopolymers. However, the chemical treatment causes serious changes in sludge properties. Sludge particle size is reduced from 21 mum to 14.6 mum, filtration properties of sludge deteriorates, indicated ...
Effect of cooperative learning based on conceptual change conditions on seventh grade students' understanding of classification of matter and physical and chemical changes Erdemir (Özdemir), Arzu; Özgenel, Lale; Department of Secondary Science and Mathematics Education (2006) The main purpose of this study was to compare the effectiveness of the cooperative learning based on conceptual change conditions and traditionally designed science instruction on 7th grade students̕ understanding of chemical and physical changes and classification of matter concepts and attitudes toward science as a school subject. In this study 102 seventh grade students from four classes of a Science Course instructed by the two teachers from ODTÜ G.V. Özel Ilkögretim Okulu took part. One of the classes ...
Effect of Synthetic Fibers on Energy Absorption Capacity of Normal and High Performance Concrete Şengün, Emin; Alam, Burhan; Yaman, İsmail Özgür (null; 2016-06-08) With the increasing aim of incorporating concrete in different applications and infrastructure elements, the use of macro synthetic fiber incorporated concretes has become real popular thanks to their high energy absorption capacity, toughness and impact resistance. The aim of this study is to investigate the effects of synthetic fibers on toughness and energy absorption of normal and high performance concretes. For this experimental study, eight concrete groups were designed using synthetic fibers of vario...

Citation Formats

F. D. Sanin, “Effect of solution physical chemistry on the rheological properties of activated sludge,” WATER SA, pp. 207–211, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46834.