Simultaneous sludge minimization and nutrients removal in activated sludge process

Update item information
Publication Type thesis
School or College College of Engineering
Department Civil & Environmental Engineering
Author Liu, Yanjie
Title Simultaneous sludge minimization and nutrients removal in activated sludge process
Date 2007-11-05
Description Simultaneous biological phosphorus and nitrogen removal along with sludge minimization in an anaerobic-aerobic-anoxic sequencing batch reactor was investigated. One control-SBR in nutrient removal mode and one SBR in nutrient removal along with sludge minimization mode (modified-SBR) were run for more than 10 months. The waste activated sludge from the control-SBR was subjected to conventional anaerobic digestion at 10 day HRT whereas the sludge reduction in the modified-SBR was achieved by subjecting the recycled sludge to fasting and feasting with the aid of a sludge holding tank that was attached top the modified-SBR. The NH3-N removal efficiencies in both the SBRs were consistent at an average influent NH3-N concentration of 25.3 mg N/L and NH3-N concentrations in the effluents of both reactors were below detection limits. The average removal efficiencies of dissolved phosphorus in the control-SBR and the modified-SBR were 86.5% and 83.6%, respectively, under anaerobic-aerobic-anoxic mode of operation. When the time cycle in both the reactors was changed to anaerobic-aerobic-anoxic-aerobic for the betterment of EBPR activity, the EBPR activity improved in the control-SBR, giving an average effluent P concentration of 3.2 mg/L. On the contrary, the EBPR activity in the modified-SBR deteriorated due to this change. The biomass yield in the modified-SBR was estimated to be 0.166 mg TSS/mg COD, which represented a 61.4 % reduction in solids reduction compared to the control-SBR.
Type Text
Publisher University of Utah
Subject Sewage sludge digestion
Dissertation Institution University of Utah
Dissertation Name MS
Language eng
Relation is Version of Digital reproduction of "Simultaneous sludge minimization and nutrients removal in activated sludge process" J. Willard Marriott Library Special Collections TD7.5 2008 .L58
Rights Management © Yanjie Liu
Format Medium application/pdf
Format Extent 56,913 bytes
Identifier us-etd2,121846
Source Original: University of Utah J. Willard Marriott Library Special Collections
Conversion Specifications Original scanned on Epson GT-30000 as 400 dpi to pdf using ABBYY FineReader 9.0 Professional Edition.
ARK ark:/87278/s6k3687j
Setname ir_etd
Date Created 2012-04-23
Date Modified 2012-05-16
ID 193403
Reference URL https://collections.lib.utah.edu/ark:/87278/s6k3687j