Maximizing trickling filter nitrification rates through biofilm control: research review and full scale application

1997 ◽  
Vol 36 (1) ◽  
pp. 255-262 ◽  
Author(s):  
Denny S. Parker ◽  
Tom Jacobs ◽  
Erich Bower ◽  
Dennis W. Stowe ◽  
Greg Farmer
Keyword(s):  
Control Strategies ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Full Scale ◽  
Research Review ◽  
Trickling Filter ◽  
Trickling Filters ◽  
The Past ◽  
Biofilm Control ◽  
Control Research

Tertiary nitrifying trickling filters (NTFs) at the Littleton/Englewood wastewater treatment plant provide for nitrification to meet seasonally varying effluent requirements for ammonia nitrogen. Operation of the full-scale facilities during the past two years demonstrates highly efficient oxidation of ammonia and the effectiveness of biofilm control strategies. A decline in nitrification performance caused by predators was successfully corrected by the use of a special alkaline backwash feature which controlled the level of larval development within the NTFs.

Heating up trickling filters to tackle cold weather conditions

2000 ◽  
Vol 41 (1) ◽  
pp. 163-166 ◽  
Author(s):  
W. Gebert ◽  
P.A. Wilderer
Keyword(s):  
Waste Heat ◽  
Treatment Plant ◽  
Weather Conditions ◽  
Pilot Scale ◽  
Cold Weather ◽  
Filling Material ◽  
Trickling Filter ◽  
Biofilm Thickness ◽  
Trickling Filters ◽  
Biofilm Support

The investigated effects of heating the filling material in trickling filters were carried out at the Ingolstadt wastewater treatment plant, Germany. Two pilot scale trickling filters were set up. Heat exchanger pipings were embedded in the filter media of one of these trickling filters, and the temperature in the trickling filter was raised. The other trickling filter was operated under normal temperature conditions, and was used as a control. The results clearly demonstrate that the performance of trickling filters cannot be constantly improved by heating the biofilm support media. A sustained increase of the metabolic rates did not occur. The decrease of the solubility of oxgen in water and mass transfer limitations caused by an increase of the biofilm thickness are the main reasons for that. Thus, the heating of trickling filters (e.g. by waste heat utilization) in order to increase the capacity of trickling filters under cold weather conditions cannot be recommended.

Dynamic simulation of a low loaded trickling filter for nitrification

1999 ◽  
Vol 39 (4) ◽  
pp. 163-168 ◽  
Author(s):  
K. Seggelke ◽  
F. Obenaus ◽  
K.-H. Rosenwinkel
Keyword(s):  
Dynamic Simulation ◽  
Weather Conditions ◽  
Full Scale ◽  
Trickling Filter ◽  
Examination Period ◽  
Trickling Filters ◽  
Biofilm Model ◽  
Measuring Campaign

For this report, an existing biofilm model was examined in regard to its suitability for the simulation of full scale trickling filter for nitrification. The system was calibrated using the results ascertained in a measuring campaign under dry weather conditions. The verification was done using the results of a second examination period which included spells of stormwater input. It was possible for all periods to satisfactorily illustrate the degradation performance of the simulated trickling filters in regard to dynamics and quantity.

scholarly journals Enhanced Degradation of Naproxen by Immobilization of Bacillus thuringiensis B1(2015b) on Loofah Sponge

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 872 ◽  
Author(s):  
Anna Dzionek ◽  
Danuta Wojcieszyńska ◽  
Małgorzata Adamczyk-Habrajska ◽  
Urszula Guzik
Keyword(s):  
Bacillus Thuringiensis ◽  
System Analysis ◽  
Treatment Plant ◽  
Trickling Filter ◽  
Significant Drop ◽  
Trickling Filters ◽  
Degrading Bacterium ◽  
Loofah Sponge ◽  
Immobilised Cells ◽  
Bacterium Bacillus

The naproxen-degrading bacterium Bacillus thuringiensis B1(2015b) was immobilised onto loofah sponge and introduced into lab-scale trickling filters. The trickling filters constructed for this study additionally contained stabilised microflora from a functioning wastewater treatment plant to assess the behavior of introduced immobilized biocatalyst in a fully functioning bioremediation system. The immobilised cells degraded naproxen (1 mg/L) faster in the presence of autochthonous microflora than in a monoculture trickling filter. There was also abundant colonization of the loofah sponges by the microorganisms from the system. Analysis of the influence of an acute, short-term naproxen exposure on the indigenous community revealed a significant drop in its diversity and qualitative composition. Bioaugmentation was also not neutral to the microflora. Introducing a new microorganism and increasing the removal of the pollutant caused changes in the microbial community structure and species composition. The incorporation of the immobilised B1(2015b) was successful and the introduced strain colonized the basic carrier in the trickling filter after the complete biodegradation of the naproxen. As a result, the bioremediation system could potentially be used to biodegrade naproxen in the future.

Evaluation of upgrading a full-scale activated sludge process integrated with floating biofilm carriers

2014 ◽  
Vol 70 (10) ◽  
pp. 1594-1601 ◽  
Author(s):  
Shijian Ge ◽  
Yunpeng Zhu ◽  
Shuang Qiu ◽  
Xiong Yang ◽  
Bin Ma ◽  
...  
Keyword(s):  
Feeding Rate ◽  
Control Strategies ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Full Scale ◽  
Real Time Control ◽  
Aeration Time ◽  
Time Control ◽  
Aeration System ◽  
And Control

This study evaluated the performance of a full-scale upgrade of an existing wastewater treatment plant (WWTP) with the intermittent cyclic extended aeration system (ICEAS), located in Qingdao, China. The ICEAS system was not able to meet effluent standards; therefore, a series of modifications and control strategies were applied as follows: (1) floating plastic carriers were added to the tank to aid biofilm formation; (2) operation parameters such as mixing and aeration time, feeding rate, and settling time were adjusted and controlled with a real-time control system; (3) a sludge return system and submersible water impellers were added; (4) the aeration system was also improved to circulate carriers and prevent clogging. The modified ICEAS system exhibited efficient organic and nutrient removal, with high removal efficiencies of chemical oxygen demand (89.57 ± 4.10%), NH4+-N (95.46 ± 3.80%), and total phosphorus (91.90 ± 4.36%). Moreover, an annual power reduction of 1.04 × 107 kW·h was realized as a result of these modifications.

Tentative Nitrogen Removal with Fixed Bed Processes in Malmö Sewage Treatment Plant

1990 ◽  
Vol 22 (1-2) ◽  
pp. 239-250 ◽  
Author(s):  
B. Andersson
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Sewage Treatment ◽  
Fixed Bed ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Trickling Filter ◽  
Test Program ◽  
Made In

A test program for the use of fixed bed processes in systems for nitrogen removal at an advanced sewage treatment plant is described. Results from studies on nitrification in a full scale trickling filter plant with different filter depths and at different wastewater temperatures are presented. Results from full scale experiments with denitrification/nitrification in a retrofitted activated sludge plant are also presented. The effect of an aerated submerged fixed bed in the aeration basin on nitrification was investigated. Observations of the biofilm formed on the fixed bed were made in microscope.

Supervisory control strategies for the new WWTP of Galindo-Bilbao: the long run from the conceptual design to the full-scale experimental validation

2006 ◽  
Vol 53 (4-5) ◽  
pp. 193-201 ◽  
Author(s):  
E. Ayesa ◽  
A. De la Sota ◽  
P. Grau ◽  
J.M. Sagarna ◽  
A. Salterain ◽  
...  
Keyword(s):  
Control Strategy ◽  
Supervisory Control ◽  
Experimental Validation ◽  
Scale Validation ◽  
Control Strategies ◽  
Treatment Plant ◽  
Average Concentration ◽  
Full Scale ◽  
Control Loop ◽  
Long Run

This paper presents the theoretical basis and the main results obtained during the development and full-scale experimental validation of the new supervisory control strategy designed for the Galindo-Bilbao wastewater treatment plant (WWTP). The different phases of the project have been carried out over the last 8 years, combining model simulations, pilot-plant experimentation and full-scale validation. The final control strategy combines three complementary control loops to optimise the nitrogen removal in pre-denitrifying activated sludge plants. The first controller was designed to maintain the average concentration of the ammonia in the effluent via the automatic selection of the most appropriate DO set point in the aerobic reactors. The second control loop optimises the use of the denitrification potential and finally, the third control loop maintains the selected amount of biomass in the biological reactors by automatic manipulation of the wastage rate. Mobile-averaged windows have been implemented to incorporate commonly used averaged values in the control objectives. The performance of the controllers has been successfully assessed through the full-scale experimental validation in one of the lines of the WWTP.

Rain events and their effect on effluent quality studied at a full scale activated sludge treatment plant

2006 ◽  
Vol 54 (10) ◽  
pp. 201-208 ◽  
Author(s):  
B.-M. Wilén ◽  
D. Lumley ◽  
A. Mattsson ◽  
T. Mino
Keyword(s):  
Activated Sludge ◽  
Laboratory Data ◽  
Treatment Plant ◽  
Full Scale ◽  
Plant Performance ◽  
Particle Removal ◽  
Effluent Quality ◽  
Trickling Filters ◽  
Rain Events ◽  
The Impact

The effect of rain events on effluent quality dynamics was studied at a full scale activated sludge wastewater treatment plant which has a process solution incorporating pre-denitrification in activated sludge with post-nitrification in trickling filters. The incoming wastewater flow varies significantly due to a combined sewer system. Changed flow conditions have an impact on the whole treatment process since the recirculation to the trickling filters is set by the hydraulic limitations of the secondary settlers. Apart from causing different hydraulic conditions in the plant, increased flow due to rain or snow-melting, changes the properties of the incoming wastewater which affects process performance and effluent quality, especially the particle removal efficiency. A comprehensive set of on-line and laboratory data were collected and analysed to assess the impact of rain events on the plant performance.

Modelling and control strategy testing of biological and chemical phosphorus removal at Avedøre WWTP

2006 ◽  
Vol 53 (4-5) ◽  
pp. 105-113 ◽  
Author(s):  
P. Ingildsen ◽  
C. Rosen ◽  
K.V. Gernaey ◽  
M.K. Nielsen ◽  
T. Guildal ◽  
...  
Keyword(s):  
Control Strategy ◽  
Phosphorus Removal ◽  
Control Strategies ◽  
Treatment Plant ◽  
Full Scale ◽  
Operational Experience ◽  
Biological Phosphorus Removal ◽  
To Come ◽  
And Control ◽  
Biological Phosphorus

The biological phosphorus removal process is often implemented at plants by the construction of an anaerobic bio-p tank in front of the traditional N removing plant configuration. However, biological phosphorus removal is also observed in plant configurations constructed only for nitrogen removal and simultaneous or post-precipitation. The operational experience with this “accidental” biological phosphorus removal is often mixed with quite a lot of frustration, as the process seems to come and go and hence behaves quite uncontrollably. The aim of this work is to develop ways of intentionally exploiting the biological phosphorus process by the use of instrumentation, control and automation to reduce the consumption of precipitants. Means to this end are first to calibrate a modified ASM2d model to a full-scale wastewater treatment plant (WWTP), including both biological and chemical phosphorus removal and a model of the sedimentation process. Second, based on the calibrated model a benchmark model is developed and various control strategies for biological phosphorus removal are tested. Experiences and knowledge gained from the strategies presented and discussed in this paper are vital inputs for the full-scale implementation of a control strategy for biological phosphorus removal at Avedøre WWTP, which is described in another paper. The two papers hence show a way to bridge the gap from model to full implementation.

scholarly journals Reducing energy demand by the combined application of advanced control strategies in a full scale WWTP

2021 ◽  
Author(s):  
G. Bertanza ◽  
P. Baroni ◽  
S. Garzetti ◽  
F. Martinelli
Keyword(s):  
Energy Demand ◽  
Fuzzy Controller ◽  
Control Strategies ◽  
Treatment Plant ◽  
Full Scale ◽  
Phosphorus Concentration ◽  
Total Energy Consumption ◽  
Power Requirement ◽  
Combined Application ◽  
Advanced Control

Abstract Two advanced control strategies were applied on the secondary and tertiary stage, respectively, of a full-scale wastewater treatment plant (WWTP). This has a nominal capacity of 330,000 population equivalent (PE), a complex configuration (having been upgraded several times along the years), and it faces significant seasonal load fluctuations (being located in a touristic area, in Northern Italy). The lifting station of the tertiary treatments (devoted to phosphorus precipitation and UV disinfection) was optimized by adjusting the pumped flowrate, depending on influent phosphorus concentration. A preliminary simulation showed that a 15% reduction of pumping energy could be achieved. This result was confirmed by field measurements. Moreover, a fuzzy control system was designed and applied to one of the six parallel nitrification reactors, yielding a reduction of more than 25% of the power requirement for aeration. Overall, the combined application of the two controllers led to a 7% reduction of the total energy consumption of the plant. This result is particularly promising given that the fuzzy controller was applied only to one of six biological reactors.

Sign in / Sign up

Export Citation Format

Share Document