Acute impact of dimethyl phthalate on activated sludge nitrification kinetics

2015 ◽  
Vol 57 (22) ◽  
pp. 10378-10390
Author(s):  
Ilke Pala-Ozkok
Keyword(s):  
Activated Sludge ◽  
Dimethyl Phthalate ◽  
Nitrification Kinetics

Activated sludge-mediated biodegradation of dimethyl phthalate under fermentative conditions

2008 ◽  
Vol 20 (8) ◽  
pp. 922-926 ◽  
Author(s):  
Donglei WU ◽  
Qaisar MAHMOOD ◽  
Lili Wu ◽  
Ping ZHENG
Keyword(s):  
Activated Sludge ◽  
Dimethyl Phthalate

A titration technique for on-line nitrification monitoring in activated sludge

1998 ◽  
Vol 37 (12) ◽  
pp. 103-110 ◽  
Author(s):  
Krist Gernaey ◽  
Herwig Bogaert ◽  
Peter Vanrolleghem ◽  
Alessandro Massone ◽  
Alberto Rozzi ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Treatment Plant ◽  
Estimation Method ◽  
Sample Pretreatment ◽  
Mixed Liquor ◽  
Titration Curves ◽  
N Removal ◽  
Nitrification Kinetics ◽  
On Line ◽  
Simple Slope

A titrimetric method to monitor nitrification was applied on a pilot activated sludge plant for biological N removal. Mixed liquor was sampled from the aerobic compartment of the treatment plant and a titration in-sensor experiment was performed. Interpretation of the cumulative base addition curves resulting from each titration in-sensor experiment was done using both a simple slope extrapolation method and a model-based non-linear parameter estimation method. The NH4+-N concentrations obtained with both methods correlated well with the NH4+-N concentrations measured on the effluent of the pilot plant using an on-line NH4+-N analyser. Contrary to most physical/chemical NH4+-N analysers, no sample pretreatment of the mixed liquor is needed for the measurements. It is shown in detail that interpretation of the titration curves yields information about the nitrification kinetics too, which can be an important advantage for process control purposes.

Nitrification kinetics of activated sludge-biofilm system: A mathematical model

2010 ◽  
Vol 101 (15) ◽  
pp. 5827-5835 ◽  
Author(s):  
Arun Kumar Thalla ◽  
Renu Bhargava ◽  
Pramod Kumar
Keyword(s):  
Mathematical Model ◽  
Activated Sludge ◽  
System A ◽  
Nitrification Kinetics ◽  
Kinetics Of

Nitrification parameter measurement for plant design: experience and experimental issues with new methods

2005 ◽  
Vol 52 (10-11) ◽  
pp. 461-468 ◽  
Author(s):  
R.M. Jones ◽  
C.M. Bye ◽  
P.L. Dold
Keyword(s):  
Activated Sludge ◽  
Process Design ◽  
Wastewater Treatment Plants ◽  
Measurement Techniques ◽  
Water Environment ◽  
Plant Design ◽  
New Methods ◽  
Nitrification Kinetics ◽  
Activated Sludge Modeling ◽  
Capacity Rating

Nitrification kinetics are important for process design, optimization, and capacity rating of activated sludge wastewater treatment plants. A Water Environment Research Foundation (WERF) project on Methods for Wastewater Characterization in Activated Sludge Modeling (WERF, 2003) focused significantly on the development of procedures for measuring the nitrifier maximum specific growth rate, μAUT. In addition, the importance of (and lack of data for) the nitrifier decay rate, bAUT, was identified. This paper describes three bench-scale methods for measuring μAUT: the Low F/M SBR, Washout and High F/M methods. During the WERF project, the importance of pH and temperature control was investigated briefly; this paper summarizes further experimental work performed to address these issues. A summary of μAUT measurements in a number of locations and using the different measurement techniques is provided.

Response of Phthalate Esters-Acclimated Activated Sludge to 2,4-Dinitrophenol

1987 ◽  
Vol 19 (3-4) ◽  
pp. 461-470 ◽  
Author(s):  
R. Yucel Tokuz
Keyword(s):  
Activated Sludge ◽  
System Performance ◽  
Suspended Solids ◽  
Phthalate Esters ◽  
Oxygen Demand ◽  
Process Performance ◽  
Dimethyl Phthalate ◽  
L System ◽  
Period System ◽  
Acclimated Activated Sludge

The process performance of an activated sludge system during acclimation to phthalate esters was examined. Concentration of the phthalate esters was increased gradually, and over about a two-week period, the acclimation to a mixture of 410 mg/L diethyl phthalate and 540 mg/L dimethyl phthalate was complete. It was observed that the effluent Chemical Oxygen Demand (COD) was not affected adversely in spite of increasing influent COD. Other indicators of process performance, for example, effluent suspended solids, were at acceptable levels at the completion of acclimation. The system responded well when 2,4-dinitrophenol, up to 4 mg/L, was included in the influent in addition to phthalate esters. Actually an improvement in system effluent COD was observed possibly due to increasing Mixed Liquor Suspended Solids (MLSS). At a 2,4-dinitrophenol concentration of 8 mg/L, system performance deteriorated considerably but the recovery was fast, and within a two-week period system performance returned to normal.

Nitrification Kinetics in Single-Sludge Biological Nutrient Removal Activated Sludge Systems

1992 ◽  
Vol 25 (6) ◽  
pp. 195-214 ◽  
Author(s):  
C. W. Randall ◽  
V. M. Pattarkine ◽  
S. A. McClintock
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Municipal Wastewater ◽  
Biomass Concentration ◽  
Biological Nutrient Removal ◽  
Mixed Liquor ◽  
Nitrification Kinetics ◽  
Anoxic Zones ◽  
Complete Nitrification ◽  
Activated Sludge Systems

Nitrification kinetics as a function of mixed liquor temperature were compared for a conventional fully-aerobic activated sludge system and a system accomplishing biological nutrient removal (BNR) by incorporation of anaerobic and anoxic zones using the UCT configuration. The systems treated the same municipal wastewater and both had flow rates of 151 L/day. The nitrification rates were greater in the nutrient removal system compared to the conventional system as long as the aerobic MCRT was above the minimum for complete nitrification. It was concluded that BNR systems require less aerobic volume than fully aerobic systems to accomplish nitrification because the aerobic biomass concentration is greater in the BNR systems, particularly if the UCT configuration is used. Nonetheless, BNR systems require more total volume to accomplish complete nitrification than fully aerobic systems, and the volume differential increases as mixed liquor temperatures decrease.

Nitrification Kinetics in Activated Sludge with Both Suspended and Attached Biomasses

1994 ◽  
Vol 29 (7) ◽  
pp. 181-184 ◽  
Author(s):  
P. Chudoba ◽  
M. Pannier
Keyword(s):  
Activated Sludge ◽  
Aeration Tank ◽  
Continuous Systems ◽  
Biomass Growth ◽  
Batch Tests ◽  
Activated Sludge System ◽  
Nitrification Kinetics ◽  
Kinetic Tests ◽  
Suspended Biomass ◽  
Kinetics Of

A series of nitrification kinetic tests was carried out with both suspended and fixed biomasses originated from a combined activated sludge system with a plastic support for biomass growth introduced into the aeration tank (Experimental combined unit - ECU). The results of these batch tests were compared with kinetics calculated from continuously run pilot plant. It was concluded that nitrification kinetics of both suspended and attached biomasses were similar and, consequently, it was assumed that the percentage of autotrophs is the same in both biomasses. The kinetics determined in both batch and continuous systems were comparable. Kinetic constants measured for suspended biomass of the ECU were higher than those reported by the literature, which was attributed to an overaeration of the ECU and an energetic mixing

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