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.

Effect of Substrate Concentration on Hydrogen Production from Fermentation of Sugar Wastewater

2013 ◽  
Vol 409-410 ◽  
pp. 235-241
Author(s):  
Zheng Zhou ◽  
Kai Liu ◽  
Qiu Yang He
Keyword(s):  
Hydrogen Production ◽  
Production Rate ◽  
Substrate Concentration ◽  
Anaerobic Fermentation ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Gas Production ◽  
Production Performance ◽  
Volatile Acid ◽  
Hydrogen Production Rate

The biological hydrogen production by the sugar wastewater is an effective way to achieve the reclamation. In this paper, the effect of substrate concentration on the hydrogen production is discussed through employing the self-made continuous flow anaerobic fermentation hydrogen production reactor, taking the sludge in urban sewage treatment plant as the inoculated sludge and the simulated sugar wastewater as the substrate. The experimental results show that the best hydrogen production effect can be obtained when the temperature is (37±1) °C, HRT is 7h, the water alkalinity is around 530mg/L and the substrate concentration is 5000mg/L, namely the organic load is 60kgCOD/(m3·d). The volumes of gas production and hydrogen production both reach the maximum. The average values are respectively 36.2L/d and 21.8L/d. The obtained hydrogen production rate is 0.93kgCOD/(m3·d). During the whole process, the proportion of volatile acid composition remains stable, which is the butyric acid-type fermentation. When the concentration of COD is increased to 6000-8000mg/L, the ability of hydrogen production of system will be significantly dropped due to the increase of pH of system. The hydrogen production performance can be restored through artificially and timely lowering the water alkalinity. However, the hydrogen production rate will be decreased compared to the previous situation.

Dynamic simulation of sludge blanket movements in a full-scale rectangular sedimentation basin

1996 ◽  
Vol 33 (1) ◽  
pp. 89-99 ◽  
Author(s):  
F. Göhle ◽  
A. Finnson ◽  
B. Hultman
Keyword(s):  
Dynamic Simulation ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Simulation Studies ◽  
Separation Processes ◽  
Sedimentation Basin ◽  
Near Future ◽  
Sludge Concentration

Bromma sewage treatment plant in Stockholm is the second largest plant in Stockholm and will in the near future have requirements for nitrogen removal. This means that a higher sludge age must be used in the aeration basin. This may be accomplished by an increase of the sludge concentration up to values until the limiting solids flux is exceeded. Measurement of the sludge blanket level is a possibility for better control of the sedimentation basin. Different measurements were performed to evaluate the main factors influencing the level. Dynamic simulation studies were performed at Bromma sewage treatment plant in Stockholm of the sludge blanket level and the return sludge concentration in a full-scale sedimentation basin. The simulations were performed with the help of a Danish simulation package, EFOR (1992), in which both reactions in the aeration basin (mainly based on the IAWPRC model) and separation processes in the sedimentation basin (both clarification and thickening) can be studied. The thickening model is based on the solids flux theory and the Vesilind formula (1979). Different methods were compared for determination and use of characteristic parameters in the Vesilind formula.

Predicting the Fate of Volatile Organic Compounds in Municipal Wastewater Treatment Plants

1992 ◽  
Vol 25 (4-5) ◽  
pp. 383-389 ◽  
Author(s):  
H. Melcer ◽  
J. Bell ◽  
D. Thompson
Keyword(s):  
Volatile Organic Compounds ◽  
Activated Sludge ◽  
Organic Compounds ◽  
Pilot Plant ◽  
Municipal Wastewater ◽  
Dynamic Models ◽  
Treatment Plant ◽  
Full Scale ◽  
Volatile Organic ◽  
Plant Data

Pilot plant and full scale investigations were carried out to determine the fate of selected volatile organic compounds (VOCs) in activated sludge aeration basins. Treatability parameters for each VOC were estimated from these investigations and used to calibrate TOXCHEM, computer-based steady state and dynamic models developed to predict the fate of VOCs in municipal activated sludge systems. The pilot plant was fed with wastewater from two different municipal sources. It was operated in parallel with a municipal treatment plant and was found to adequately simulate the performance of the full scale plant. Data suggest that the current models, calibrated with pilot plant data, may produce useful predictions of the fate of VOCs in full scale plants.

scholarly journals Risk assessment of Giardia from a full scale MBR sewage treatment plant caused by membrane integrity failure

2015 ◽  
Vol 30 ◽  
pp. 252-258 ◽  
Author(s):  
Yu Zhang ◽  
Zhimin Chen ◽  
Wei An ◽  
Shumin Xiao ◽  
Hongying Yuan ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Sewage Treatment ◽  
Membrane Integrity ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale

scholarly journals Modeling of Novel Processes for Eliminating Sidestreams Impacts on Full-Scale Sewage Treatment Plant Using GPS-X7

2021 ◽  
Author(s):  
Ahmed M. Faris ◽  
Haider M. Zwain ◽  
Majid Hosseinzadeh ◽  
Seyed Mostafa Siadatmousavi
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Biofilm Reactor ◽  
Moving Bed Biofilm Reactor ◽  
Innovative Treatment ◽  
Innovative Process ◽  
Treat All ◽  
Do So

Abstract Worldwide, most of treatment system are retuning sidestreams (SSs) to the plant wastewater head without treatment, and some innovations are only treating centrate. In this study, an innovative process was established to separately treat all SSs away from plant mainstream and return treated sidestream effluents to plant wastewater outfall instead of wastewater head. This innovative process aims to eliminate SSs impacts on full scale A2/O sewage treatment plant. To do so, a novel pilot extended nutrient moving bed biofilm reactor (EN-MBBR) was developed to treat all SSs lines (supernatant gravity thickener, underflow mechanical thickener, and centrate), and SSs elimination on full scale A2/O system was simulated using GPS-X7. The results of two steps innovative treatment showed that 98, 98, 93, 100, 85, 100 and 98% of TSS, BOD, COD, NH4, NO3, H2S and PO4-P were removed from SSs, respectively. The two steps innovative treatment combined degradation, nitrification, and dilution processes. The simulation results proved that eliminating SSs has eliminated hydraulic and pollutants shocks, reduced the volumes of full scale A2/O facilities, and minimized cost and energy. Moreover, the calibrated model was validated with R values more than 0.8 and NMSE values close to zero. To conclude, the innovative process in this study successfully treated SSs separately and eliminated their impacts.

scholarly journals Study of the performance of disinfection with sodium hypochlorite on a full-scale sewage treatment plant

2020 ◽  
Vol 15 (6) ◽  
pp. 1
Author(s):  
Maria Rosaria Boni ◽  
Sabrina Copelli ◽  
Massimo Raboni
Keyword(s):  
Sodium Hypochlorite ◽  
Retention Time ◽  
Contact Time ◽  
Regression Line ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Process Efficiency ◽  
Residual Chlorine

A full-scale sewage treatment plant was investigated to assess the performance of the disinfection stage. Sodium hypochlorite was used as a disinfectant agent and the process efficiency was evaluated by E.coli removal. The research took place over a period of two years in order to evaluate the effect of retention time (t) and residual chlorine (Cr) under different seasonal conditions. The effectiveness of E.coli removal with sodium hypochlorite proved to be strictly dependent on the factor CR  t (product of residual chlorine with the contact time). The regression line of the experimental points was, on the whole, well comparable with the model proposed by Collins, especially in the field of CRt lower than 30 mg L-1 min.

The Effects of Aluminum Sludge From Water Purification on Municipal Primary Sewage Treatment

1973 ◽  
Vol 8 (1) ◽  
pp. 122-147
Author(s):  
J. D. O’Blenis ◽  
T.R. Warriner
Keyword(s):  
Water Purification ◽  
Pilot Plant ◽  
Suspended Solids ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Phosphate Removal ◽  
Plant Performance ◽  
Alum Sludge

Abstract The current widespread practice of disposal of water filtration plant wastes by direct discharge to receiving waters is coming under critical review by regulatory agencies. Among the alternatives for management of these wastes is the possibility of disposal to sanitary sewer systems. Since a recent nation-wide survey had established alum sludge as the most common waste generated by filtration plants, research was initiated to study the effects of water plant alum sludge on primary sewage treatment. A pilot primary sewage treatment plant was constructed and operated with a raw sewage feed of five litres per minute. A laboratory jar test program was conducted to supplement pilot plant operation. Sludges from two different water purification plants were tested along with alum and combinations of alum and water purification plant sludge for their effects on the removal of suspended solids, chemical oxygen demand (COD) and phosphates. The data showed jar testing to be a good indicator of pilot plant performance. Suspended solids, COD and phosphate removal efficiencies were improved by the addition of the sludges. The phosphate removal capacity of water treatment plant alum sludge was approximately the same as that reported for aluminum hydroxide, or about 1/7 to 1/9 of that determined for alum (as Aluminum). Recycling of the sludges improved phosphate removal performance.

Operational efficiency of a pilot plant for wastewater reuse

1996 ◽  
Vol 33 (10-11) ◽  
pp. 443-450 ◽  
Author(s):  
Fulvio Croce ◽  
David Hendricks ◽  
Joe Pollara ◽  
Susan Poulsom ◽  
Rosalaura Oliveri ◽  
...  
Keyword(s):  
Public Health ◽  
Pilot Plant ◽  
Wastewater Reuse ◽  
Treatment Plant ◽  
Control Parameters ◽  
High Quality ◽  
Plant Operation ◽  
Safety Margins ◽  
Overall Performance ◽  
Operation And Management

Reuse of wastewaters for non-potable uses needs a higher than normal reliability in treatment plant operation and management, in order to ensure higher safety margins for public health and environmental protection. After a two-years research project on a pilot plant designed for agricoltural reuse, all control parameters used for the plant operation have been examined, in order to obtain useful observations on efficiency of each of the treatment units, for best overall performance. It was concluded that this type of package plant was able to produce a high quality effluent under various conditions, providing a good confidence on the reliability of the system.

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.

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