Biological and chemical sludge filtration

Download

index.pdf

Date

2007

Author

Yükseler, Hande

Metadata

Show full item record

Item Usage Stats

185
views

54
downloads

Up to date, sludge filterability has been characterized by the Ruth’s classical filtration theory and quantified by the well-known parameter specific cake resistance (SCR). However, the complexity of the actual phenomenon is clearly underestimated by the classical filtration theory and SCR is often not satisfactory in describing filterability. Although many scientific studies were conducted for a better analysis and understanding of the filtration theory, still a practically applicable solution to replace the classical theory for a better description of filterability has not been proposed yet. In the present study, blocking filtration laws proposed by Hermans and Bredée, dating back to 1936, which have been extensively used in the membrane literature for the analysis of fouling phenomenon and the multiphase filtration theory developed by Willis and Tosun (1980) highlighting the importance of the cake-septum interface in determining the overall filtration rate have been adopted for the analysis of filterability of sludge systems. Firstly, the inadequacy of the classical filtration theory in characterizing the filterability of real sludge systems and also the lack of the currently used methodology in simulating filtration operation was highlighted. Secondly, to better understand the effect of slurry characteristics and operational conditions on filtration, model slurries of spherical and incompressible Meliodent particles were formed. Finally, a methodology was developed with the gathered filtration data to assess the filterability of the sludge systems by both theories. The results clearly show that both approaches were superior to the classical approach in terms of characterizing the filterability of sludge systems. While blocking laws yielded a slurry specific characterization parameter to replace the commonly used SCR, the multiphase theory provided a better understanding of the physical reality of the overall process.

Subject Keywords

Sanitary engineering., Environmental engineering.

URI

http://etd.lib.metu.edu.tr/upload/12608608/index.pdf
https://hdl.handle.net/11511/17199

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Anaerobic treatment of dilute wastewaters Alptekin (Ener), Emel; Demirer, Göksel Niyazi; Department of Environmental Engineering (2008) In this study, domestic wastewater was used to determine the anaerobic treatment performances of a dilute wastewater in one-phase upflow anaerobic sludge blanket (UASB) system and two-phase upflow anaerobic filter (UAF) and UASB system. The acidification performances of domestic wastewater were compared in UAF and UASB reactors. The degree of acidification is higher in UAF reactor (31%) compared to UASB reactor (18%) at 2 h hydraulic retention time (HRT) in the anaerobic treatment of domestic wastewaters. T...
A new approach in assessing slurry filterability Yukseler, Hande; Tosun, İsmail; Yetiş, Ülkü (2007-10-15) Up to date, sludge filterability has been characterized by the Ruth's classical filtration theory and quantified by the well-known parameter specific cake resistance (SCR). However, the complexity of the actual phenomenon is clearly underestimated by the classical filtration theory and SCR is often not satisfactory in describing filterability. Although many scientific studies were conducted for a better analysis and understanding of the filtration theory, still a practically applicable solution to replace t...
Numerical and experimental investigation of quench process Gür, Cemil Hakan; Ozturk, T (1996-11-07) Numerical and experimental studies have been carried out to investigate the evolution of residual stresses in quenched components induced by temperature gradient and phase transformations. In the numerical analysis, a finite element model is implemented for predicting the temperature field, phase changes with their associated internal stresses in axisymmetrical steel components. The model is verified by several comparisons with other known numerical results. Case studies are performed to investigate the eff...
Modeling of activated sludge process by using artificial neural networks Moral, Hakan; Gökçay, Celal Ferdi; Department of Environmental Engineering (2004) Current activated sludge models are deterministic in character and are constructed by basing on the fundamental biokinetics. However, calibrating these models are extremely time consuming and laborious. An easy-to-calibrate and user friendly computer model, one of the artificial intelligence techniques, Artificial Neural Networks (ANNs) were used in this study. These models can be used not only directly as a substitute for deterministic models but also can be plugged into the system as error predictors. Thr...
Analysis of the heterogeneity scale effects on pump and treat aquifer remediation design Güngör Demirci, Gamze; Aksoy, Ayşegül; Department of Environmental Engineering (2009) The effect of heterogeneity correlation scale of hydraulic conductivity (K), equilibrium distribution coefficient (Kd) and mass transfer rate on the design and cost of the P&T remediation system for different heterogeneity levels (defined by the variance (σ2lnK)) and parameter distributions under the rate-limited sorption conditions was evaluated in this study. In addition, the impacts of initial amount of contaminant mass and plume configuration on the remediation design and cost were explored. The effects...

Citation Formats

H. Yükseler, “Biological and chemical sludge filtration,” Ph.D. - Doctoral Program, Middle East Technical University, 2007.