Model development and full scale validation for anaerobic treatment of protein and fat based wastewater

1997 ◽  
Vol 36 (6-7) ◽  
pp. 423-431 ◽  
Author(s):  
Damien Batstone ◽  
Jürg Keller ◽  
Bob Newell ◽  
Mark Newland
Keyword(s):  
Scale Validation ◽  
Model Development ◽  
Treatment Plant ◽  
Anaerobic Treatment ◽  
Gas Production ◽  
Full Scale ◽  
High Rate ◽  
Soluble Carbohydrates ◽  
Biological Degradation ◽  
Component Mixture

Presented is a kinetic model simulating the biodegradation of pig abattoir (slaughterhouse) wastewater in a full scale anaerobic treatment plant. High rate anaerobic treatment of these wastes is often complicated by the presence of particulates and fats. The model developed by Costello et al. (1991) for the degradation of soluble carbohydrates and modified by Ramsay et al. (1994) for soluble proteins is further expanded to simulate the solublisation of particles and the biological degradation of fats. This approached proved well suited to describe the full breakdown of the complex component mixture found in such a wastewater. The model is tuned using one dynamic experimental run and is validated against on two different experimental runs. Agreement between simulation and experimental results is very good on all sets of data. The importance of critical outputs such as gas production and agreement between experimental and simulation results are discussed. It is concluded that the model should be a useful tool for optimal reactor design and operation when encountering difficult wastewaters.

The effect of anaerobic pre-treatment on the inert soluble COD of fermentation industry effluents

1995 ◽  
Vol 32 (12) ◽  
pp. 35-42 ◽  
Author(s):  
G. Yilmaz ◽  
I. Öztürk
Keyword(s):  
Treatment Plant ◽  
Anaerobic Treatment ◽  
Baker’S Yeast ◽  
Full Scale ◽  
Operating Conditions ◽  
Baker's Yeast ◽  
Series Of Experiments ◽  
Pre Treatment ◽  
Process Wastewater ◽  
Volumetric Loading

The objective of this study is to determine the inert soluble COD of wastewaters from the fermentation industry. In this context, a series of experiments were performed for various effluents from baker's yeast industry including raw process wastewater, anaerobic pre-treatment plant effluents, domestic and washing waters mixture. The inert COD ratio (SISO) for the raw effluents from baker's yeast industry was determined as 0.1. This ratio was in the range of 0.20 to 0.30 for the anaerobically pre-treated effluents. TheSISO ratios for the wastewater simulating the effluent of the existing full-scale aerobic treatment plant have varied from 0.18 to 0.48. Such a large variation has been originated from the operating conditions of the existing full-scale anaerobic treatment plants. The higher volumetric loading rates and shorter sludge retention times correspond the lower SISO ratios for the full-scale anaerobic treatment systems in general.

scholarly journals Integration of high-rate DAF technology within a municipal biofiltration plant for the treatment and thickening of backwash wastewaters

2018 ◽  
Vol 13 (4) ◽  
pp. 812-820
Author(s):  
Roche Clement ◽  
Manic Gildas ◽  
Lacroix Isabelle
Keyword(s):  
Municipal Wastewater ◽  
Cost Optimization ◽  
Treatment Plant ◽  
Water Concentration ◽  
Full Scale ◽  
High Rate ◽  
Municipal Wastewater Treatment ◽  
Design Integration ◽  
Performance Results ◽  
Direct Discharge

Abstract Industrial full-scale application of high-rate dissolved air floatation (DAF) in the municipal wastewater treatment plant (WWTP) of Grenoble (France) has highlighted outstanding performance results leading to new design-to-cost perspectives. The integration of DAF technology to treat the returns from the backwash waters of submerged biological aerated filters (BAF) (nitrification stage) has demonstrated removal efficiencies that allow further room for global process optimization. The results obtained on nitrifying BAF backwash water showed a DAF outlet water concentration of less than 25 mg.L−1 of total suspended solids at 25 m.h−1, with only polymer conditioning. Such high clarification performance allows leveraging of valuable cost optimization of global process design integration. Direct discharge from DAF's outlet into the receiving body can be implemented. Hydraulic and solid return loads can therefore be significantly reduced at the inlet of the WWTP. Moreover, floated sludge extracted from the DAF units achieved 4.4% dryness on average. The high thickening operational performance of this DAF technology is able to produce sludge directly compatible with anaerobic digestion. These full-scale results demonstrate that Suez's GreenDAF™-BWW technology in such application can leverage new rooms for design improvement for BAF treatment and total cost optimization of both the mainstream water treatment line and sludge line.

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.

Cost optimal operation of an industrial two-stage high-rate anaerobic treatment plant

1991 ◽  
Vol 7 (1-2) ◽  
pp. 53-61 ◽  
Author(s):  
D. J. Costello ◽  
P. L. Lee ◽  
P. F. Greenfield
Keyword(s):  
Treatment Plant ◽  
Anaerobic Treatment ◽  
Optimal Operation ◽  
High Rate ◽  
Two Stage

Modelling of the carrousel plant

1994 ◽  
Vol 30 (6) ◽  
pp. 345-354 ◽  
Author(s):  
Ján Derco ◽  
Milan Králik ◽  
Miroslav Hutnan ◽  
Igor Bodík ◽  
Rastislav Cernák
Keyword(s):  
Kinetic Model ◽  
Treatment Plant ◽  
Full Scale ◽  
High Rate ◽  
Experimental Simulation ◽  
Computational Time ◽  
Model Parameters ◽  
Intermittent Aeration ◽  
In Series ◽  
Impurities Removal

The results of experimental and mathematical modelling of simultaneous processes of organic and nitrogen impurities removal in an industrial Carrousel wastewater treatment plant are presented. The hydrodynamic regime measurements in the full-scale Carrousel system have led to the conclusion that at least three hydrodynamic models such as tank-in-series, ideally mixing reactor with aerobic and anoxic volume and completely mixing reactor with an intermittent aeration, are suitable to describe the dynamic behaviour of this bioreactor. The tank-in-series and the intermittently aerated completely mixing equipments were used in lab-scale modelling of the Carrousel plants. Various kinetic models and a statistical approach were applied to the evaluation of laboratory and full-scale data. The simplified kinetic model proved to be convenient for the process control purposes due to the significant computational time reduction in model parameters determination in comparision to tank-in-series hydrodynamic modelling. Also, the statistical model is very suitable approximation of the processes carried out in the Carrousel system. The completely mixing bioreactor with intermittent aeration is advantageous for experimental simulation of simultaneous nitrification and denitrification processes performed in high-rate recycled activated sludge systems. The influence of wastewater substances on oxygen transport rate is implicitly incorporated through aerobic and anoxic ‘switching functions’ evaluated based on oxygen profile data monitored in the bioreactor when applying the modified IAWPRC kinetic model.

Operation control of anaerobic digesters on the basis of enzyme activity tests

2009 ◽  
Vol 60 (4) ◽  
pp. 957-964 ◽  
Author(s):  
Levente Kardos ◽  
György Palkó ◽  
József Oláh ◽  
Katalin Barkács ◽  
Gyula Záray
Keyword(s):  
Enzyme Activity ◽  
Acid Concentration ◽  
Pilot Plant ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Gas Production ◽  
Full Scale ◽  
Volatile Acid ◽  
Control Parameters ◽  
Activity Measurements

In our experimental work the pilot plant and full scale anaerobic bioreactors of a communal sewage treatment plant were tested by applying usual control parameters (pH, volatile acid content, alkalinity, gas composition), and enzyme activity (dehydrogenase, protease, lipase) measurements. Influence of temperature change was examined in pilot plant scale, while the effect of alteration in specific organic matter load both in pilot and full scale. Among the control parameters only the change of the volatile acid concentration reflected the occurred influences. During the temperature varying experimental phase the dehydrogenase enzyme activity excellently indicated the influence of the different conditions. The effect of altering substrate load onto the gas production was also well followed by the enzyme activity data (mainly protease, lipase), and more rapidly than by measuring volatile acid concentration. In practice it is expedient to use enzyme activity measurements in those cases, when changes in the substrate composition and load are frequent. Another advantage of these tests is that they can be carried out quickly and at a relative low cost.

scholarly journals Controlled experiment contradicts the apparent benefits of the Fenton reaction during anaerobic digestion at a municipal wastewater treatment plant

2018 ◽  
Vol 78 (9) ◽  
pp. 1861-1870 ◽  
Author(s):  
Ahmet E. Uman ◽  
Joseph G. Usack ◽  
José L. Lozano ◽  
Largus T. Angenent
Keyword(s):  
Fenton Reaction ◽  
Municipal Wastewater ◽  
Biogas Production ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Experimental System ◽  
Anaerobic Treatment ◽  
Full Scale ◽  
Municipal Wastewater Treatment ◽  
Sludge Recycling

Abstract A previous study had reported that the Fenton reaction at full scale increased the digestibility of thickened sludge in a digester. The authors of the study had observed a positive effect on biogas productivity, but without a control. Here, we evaluated this result by investigating the anaerobic treatment characteristics of fresh, thickened sludge in an experimental design with a control. To accomplish this, two identical continuously stirred anaerobic digesters (CSADs) were operated in parallel at mesophilic conditions. We also included anaerobic settlers to mimic the full-scale plant and to accomplish sludge recycling. We fed fresh, thickened sludge to both setups once every other day, but performed the Fenton reaction with only the experimental system by adding H2O2 to the recycled biosolids from the anaerobic settler. We observed very large fluctuations in biogas production due to ever-changing characteristics of the thickened sludge both on a daily and seasonal basis. Regardless, the two setups performed almost identically with: 1) chemical oxygen demand removal efficiencies of 63.8 ± 2.9% and 62.1 ± 3.2%; and 2) biogas productivities of 0.280 and 0.279 L CH4·g−1 volatile solids for the experimental (with Fenton) and control (without Fenton) CSADs, respectively. These results indicate that the use of a Fenton reaction did not affect biogas productivities.

Comparison of different conditions, substrates and operation modes by dynamic simulation of a full-scale anaerobic SBR plant

2012 ◽  
Vol 65 (3) ◽  
pp. 558-566 ◽  
Author(s):  
S. G. E. Rönner-Holm ◽  
A. Żak ◽  
N. C. Holm
Keyword(s):  
Batch Reactor ◽  
Operation Mode ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Gas Production ◽  
Full Scale ◽  
Simulation Studies ◽  
Operation Modes ◽  
Different Temperatures ◽  
Process Wastewater

Simulation studies for a full-scale anaerobic unit of a wastewater treatment plant (WWTP) were performed using the anaerobic digestion model no. 1 (ADM1). The anaerobic full-scale plant consists of one mesophilic and one thermophilic digester, operated in an anaerobic sequential batch reactor (ASBR) mode, and sludge enrichment reactors (SER) for each digester. The digesters are fed with a mixture of vegetable waste and process wastewater from the food factory. Characteristics such as CODtotal, Ntotal and NH4-N concentrations in the influent and effluent of the digester and SERs were measured and used for input fractionation. Parameters such as level, pH, biogas amount and composition in the digester were measured online and used for calibration. For simulation studies, different temperatures and operation modes with varying chemical oxygen demand (COD) input loads corresponding to feedstocks such as fruits, vegetables and grain were analysed and compared. Higher gas production and digestion efficiency in the thermophilic reactor and in shorter cycles were found and confirmed at full scale. Serial operation mode increased the gas production, but pH inhibition occurred earlier. Feeding only biosolids into digester I and the effluent of digester I together with process water into digester II further improved gas production in serial operation mode.

Reduction of the content of organic micropollutants in digested sludge by a post-aeration process - a full-scale demonstration

2000 ◽  
Vol 42 (9) ◽  
pp. 111-118 ◽  
Author(s):  
L. Knudsen ◽  
G. H. Kristensen ◽  
P. E. Jørgensen ◽  
S.-E. Jepsen
Keyword(s):  
Treatment Plant ◽  
Full Scale ◽  
Wastewater Sludge ◽  
Biological Degradation ◽  
Organic Micropollutants ◽  
Digested Sludge ◽  
Limit Values ◽  
Anaerobically Digested Sludge ◽  
Aeration Process ◽  
First Time

Surplus wastewater sludge reused for agricultural purposes must observe certain limit values with respect to different xenobiotic substances. The latest revision of the statutory order in Denmark includes for the first time a list of limit values on organic micropollutants in sludge. Four groups of micropollutants are included in the list (LAS, PAH, NPE, and DEHP). The limit values will be revised in June 2000, at which time up to 50% of the sludge used for agricultural purposes, will not comply with the standards. It has been observed that the level of organic micropollutants is much higher in anaerobically digested sludge than in aerobically stabilised sludge. This indicates that the organic micropollutants in question can be partly or fully degraded under aerobic conditions but not under anaerobic conditions. The observations have formed the basis of the development of a post-aeration process for biological degradation of organic micropollutants in anaerobically digested sludge with the aim of enabling continued reuse of the sludge for agricultural purposes. The process is presented in this paper together with a description of a full scale demonstration experience on a Danish wastewater treatment plant © 1999, IAWQ. Published by Elsevier Science Ltd.

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