Current status of filtration theory

Date

2005-10-01

Author

Yukseler, H
Yetiş, Ülkü
Tosun, I

Metadata

Show full item record

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

Item Usage Stats

81
views

0
downloads

Sludge dewatering is a difficult process in water and wastewater treatment, as commonly achieved through filtration practice. The purpose of sludge dewatering is to remove as much of the liquid portion of the sludge so that its transport and disposal becomes possible and feasible. The extent of the performance of the filtration operation is highly influenced by the characteristics of the sludge; such as its solids concentration, bound water content, organic content, cellulose content, pH, electrical charge of particles and other sludge specific parameters. To assess the filterability and dewaterability of sludges, parameters like specific cake resistance, capillary suction time and Buchner funnel filtration time are used. The most commonly used parameter is the average specific cake resistance evaluated by the parabolic filtration equation which was developed by Ruth in 1933 employing a heuristic analogy with Ohm's Law. However, it is noted that the average specific cake resistance is not a correct parameter to characterize the filtration characteristics of many types of sludges. Because operational parameters such as, filtration area, pore size of the filter medium, applied vacuum pressure and mode of filtration operation are reported to affect the average specific cake resistance. Besides the conventional filtration theory, in literature three major theories are proposed to define filtration. However, all these three approaches are not practically applicable to characterize the filterability and dewaterability of sludges. This study is a brief review of the current status of the filtration theory.

Subject Keywords

Constant-pressure filtration, Cake filtration, Wall friction, Filter cakes, Sludge, Porosity, Resistance, Equations, Mechanism, Flow

URI

https://hdl.handle.net/11511/54526

Journal

JOURNAL OF RESIDUALS SCIENCE & TECHNOLOGY

Collections

Department of Environmental Engineering, Article

Suggestions

OpenMETU
Core

Thinking the future of membranes: Perspectives for advanced and new membrane materials and manufacturing processes Nunes, Suzana P.; Çulfaz Emecen, Pınar Zeynep; Ramon, Guy Z.; Visser, Tymen; Koops, Geert Henk; Jin, Wanqin; Ulbricht, Mathias (Elsevier BV, 2020-03-15) The state-of-the-art of membrane technology is characterized by a number of mature applications such as sterile filtration, hemodialysis, water purification and gas separation, as well as many more niche applications of successful membrane-based separation and processing of fluid mixtures. The membrane industry is currently employing a portfolio of established materials, mostly standard polymers or inorganic materials (not originally developed for membranes), and easily scalable manufacturing processes such...
Filtration testing of a ceramic capillary filter produced from a high-silica glaze San, O; Hoşten, Çetin (2002-07-01) A laboratory procedure for the production of a ceramic capillary filter from a high-silica glaze was described and its filtration response was tested in dead-end and periodic vacuum filtration modes with suspensions containing micron and sub-micron clay particles obtained from a ceramic factory wastewater stream. The same glaze raw material ground to two different levels of fineness was used for the production of the porous ceramic substrate and its surface coating. The coating particulate sol was deposited...
Use of calcium alginate as a coagulant in water treatment Çoruh, Hale Aylin; Sanin, Faika Dilek; Department of Environmental Engineering (2005) Coagulation and flocculation processes are important parts of water and wastewater treatment. Coagulation or destabilization of colloidal suspensions results in aggregation of colloidal particles by physical and chemical processes. Flocculation results in the formation of larger and settleable structures by bridging. Alginate, a polysaccharide obtained from marine brown algae, produces a gel structure when mixed with calcium ions, which is expected to be a potential coagulant in water treatment. This study ...
Homogeneous and heterogeneous catalytic ozonation of pulp bleaching effluent Balcioglu, Isil Akmehmet; Moral, Cigdem Kivilcimndan (2008-08-31) Catalytic ozonation is a promising treatment method for both water and wastewater. In this study, in order to increase the biodegradability of bleaching wastewater from an integrated pulp- and -paper production plant, granulated activated carbon-(GAC), iron-(Fe2+) and manganese-(Mn2+) ion-catalyzed ozonation processes were used as a pre-treatment process. The effects of the catalyst concentration and the initial pH (pH(i)) of wastewater on the treatment efficiency of processes were investigated. Although me...
Nanofiltration and Reverse Osmosis for Reuse of Indigo Dye Rinsing Waters Uzal, Nigmet; Yılmaz, Levent; Yetiş, Ülkü (Informa UK Limited, 2010-01-01) A membrane based treatment strategy was developed for the possible recycling of rinsing wastewater from indigo dyeing to the process itself. Performances of three different nanofiltration (NF) (NF 270 and NF 90, Dow Film Tech, USA and NF 99, Alfa Laval, Denmark) and two different reverse osmosis (RO) (HR 98 PP and CA 995 PE, Alfa Laval, Denmark) membranes were investigated with wastewater collected from the first post-rinsing tank of indigo dyeing process of a denim manufacturing plant. Dead-end microfiltra...

Citation Formats

H. Yukseler, Ü. Yetiş, and I. Tosun, “Current status of filtration theory,” JOURNAL OF RESIDUALS SCIENCE & TECHNOLOGY, pp. 205–214, 2005, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/54526.