Operational conditions of activated sludge: Influence on flocculation and dewaterability

Date

2006-01-01

Author

Sanin, Faika Dilek
Turtin, Ipek
Kara, Fadime
Durmaz, Burcu
Sesay, Mohamed L.

Metadata

Show full item record

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

Item Usage Stats

22
views

0
downloads

Selected operational conditions of activated sludge are investigated in relation to their effect on flocculation and dewatering. Semi-continuous reactors with 2 -L volume were operated at different mean cell residence times, C/N ratios, and three different influent cations. Results show that MCRT, C/N ratio, and the cation type affect the bioflocculation capacity of activated sludge measured by the quantity of extracellular polymeric substances. As the MCRT value operated in the reactors and the C/N ratio of the influent wastewater increase, total amount of polymers produced increases. High MCRT values and low C/N values cause good dewatering of the sludge. All cations are shown to stimulate the EPS production in a way that the highest total EPS concentrations are observed at the highest cation dosages. The dewaterability of the sludges improves only with increasing calcium and magnesium concentrations and deteriorates with increasing potassium concentration.

Subject Keywords

Physical and Theoretical Chemistry, General Chemical Engineering

URI

https://hdl.handle.net/11511/47775

Journal

DRYING TECHNOLOGY

DOI

https://doi.org/10.1080/07373930600838009

Collections

Department of Environmental Engineering, Article

Suggestions

OpenMETU
Core

Optimization of supercritical CO2 extraction of Thymbra spicata oil Sonsuzer, S; Şahin, Serpil; Yılmaz, Levent (Elsevier BV, 2004-07-01) The supercritical fluid extraction (SFE) of aroma compounds from Thymbra spicata was studied. Response surface methodology (RSM) was used to optimize the parameters of the supercritical fluid extraction. Independent variables were temperature (40, 50 and 60 degreesC), pressure (80, 100 and 120 bar) and time (30, 60 and 90 min). Dependent variables were yield, monoterpene, sesquiterpene and oxygenated monoterpene contents.
The Dewaterability of Disintegrated Sludge Samples Before and After Anaerobic Digestion Apul, O. Gueven; Atalar, Ilgin; Zorba, Goezde T.; Sanin, Faika Dilek (Informa UK Limited, 2010-01-01) Sludge pretreatment systems emerged during the past few decades to reduce the ever-increasing quantities of sludge. A variety of different techniques have been studied for their effectiveness in solubilizing the chemical oxygen demand (COD) and increasing the digestability and decreasing the final quantity of sludge. In this study different pretreatment techniques and their effects on dewaterability were investigated at two stages of treatment. First, dewaterability was measured as capillary suction time (C...
Drying Behavior of Meat Samples at Various Fiber Directions and Air Conditions Karabacak, Meltem Soydan; Esin, Ali; Çekmecelioğlu, Deniz (Informa UK Limited, 2014-04-26) The aim of this study was to investigate the effects of meat fiber directions and air conditions on moisture and temperature developments, shrinkage, and effective diffusivity constants compared to homogenous minced meat samples. The lean meat with three fiber directions and minced meat samples were dried at temperatures of 48 and 70 degrees C and air flow rates of 0.5, 1.0, and 1.7m/s. The minced meat samples showed 1.0 +/- 0.19 to 4.4 +/- 0.03 degrees C higher temperature values and 2.3 +/- 0.004 to 6.2 +...
Vulcan-Supported Pt Electrocatalysts for PEMFCs Prepared using Supercritical Carbon Dioxide Deposition Bayrakceken, Ayse; Smirnova, Alevtina; Kitkamthorn, Usanee; Aindow, Mark; Tuerker, Lemi; Eroğlu, İnci; ERKEY, CAN (Informa UK Limited, 2009-01-01) In this study, supercritical carbon dioxide (scCO(2)) deposition was used to prepare vulcan-supported Pt (Pt/Vulcan) electrocatalysts for proton exchange membrane fuel cells (PEMFCs), and the effects of process variables on the properties of the electrocatalysts were investigated. The two different methods used to reduce the organometallic precursor were thermal reduction in nitrogen at atmospheric pressure and thermal reduction in scCO(2). In the former method, the maximum Pt loading achieved was 9%, and t...
Flow sheet optimization by the concept of sustainable development: alumina industry Kurucak, Abdurrahman; Gürüz, Güniz; Department of Chemical Engineering (2010) In this study, effects of changes in various parameters of the Bayer process on the amount of “red mud”, which has many environmental drawbacks, were examined in accordance with the principles of “sustainable development”. The production process of Seydişehir Aluminum Plant is modeled as a case study. First a steady-state mass balance calculation is carried out by incorporating sequential modular approach. Then a model of the Bayer process digester is programmed and several simulations are carried out using...

Citation Formats

F. D. Sanin, I. Turtin, F. Kara, B. Durmaz, and M. L. Sesay, “Operational conditions of activated sludge: Influence on flocculation and dewaterability,” DRYING TECHNOLOGY, pp. 1297–1306, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47775.