Fixed Biomass Activity in Aerobic Biological Reactors Used for Wastewater Treatment

1988 ◽  
Vol 20 (11-12) ◽  
pp. 489-491
Author(s):  
J. C. Block ◽  
N. Nouvion ◽  
J. M. Cahen ◽  
Y. Lesty ◽  
G. M. Faup
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Uptake ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Biomass Growth ◽  
Head Losses ◽  
Uptake Rates ◽  
Biomass Activity ◽  
Potential Activity ◽  
Experimental Runs

Experimental runs were carried out on an upflow fixed-bed reactor. The process cycle of 24 hours was determined by following head losses used as an indicator of the clogging of the filter and of the biomass growth. Thanks to a protocol of dispersion of the biomass present into the filter, two fractions defined as fixed and shared biomass were obtained. The specific dehydrogenase activities or the specific oxygen uptake rates of the dispersed biomass were always greater than those of the fixed biomass. The aggregation of the biomass into the reactor prevents its potential activity being used to the full.

Innovative low cost procedure for nutrient removal as an integrated element of a decentralised water management concept for rural areas

2001 ◽  
Vol 44 (1) ◽  
pp. 105-112 ◽  
Author(s):  
M. Burde ◽  
F. Rolf ◽  
F. Grabowski
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Rural Areas ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Low Cost ◽  
Fixed Bed ◽  
Extreme Rainfall ◽  
Fixed Bed Reactor ◽  
Soil Zone

The absence of large rivers with rather high niveau of self purifying effect in parts of east Germany leads to a discharging of the effluent of wastewater treatment plants into the groundwater in many cases. One useful consequence is the idea of realisation of decentralised measures and concepts in urban water resources management concerning municipal wastewater as well as rainfall, precipitation. At the same time, only the upper soil zone - a few decimetres - is water - saturated and thus discharge effective, even when extreme rainfall takes place. Underneath, however, there generally exists an unsaturated soil zone, which is up to now a rather unexplored retardation element of the hydrologic- and substrate-cycle. Nutrient removal in small wastewater treatment plants that are emptying into ground waters is often beneficial. The presented studies optimised an inexpensive method of subsequent enhanced wastewater treatment. The developed reactor is similar to a concentrated subsoil passage. The fixed bed reactor is divided in two sections to achieve aerobic and anoxic conditions for nitrification/denitrification processes. To enhance phosphorus removal, ferrous particles are put into the aerobic zone. Two series of column tests were carried out and a technical pilot plant was built to verify the efficiency of the process. The results show that this method can be implemented successfully.

scholarly journals Start-up of anaerobic reactors for slaughterhouse wastewater treatment

2015 ◽  
Vol 35 (2) ◽  
pp. 331-339 ◽  
Author(s):  
RONALDO FIA ◽  
ERLON L. PEREIRA ◽  
FÁTIMA R. L. FIA ◽  
DÉBORA G. EMBOABA ◽  
EMANUEL M. GOMES
Keyword(s):  
Wastewater Treatment ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Upflow Anaerobic Sludge Blanket ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Stable Operation ◽  
Slaughterhouse Wastewater ◽  
Start Up ◽  
Bicarbonate Alkalinity

This study aimed to evaluate the start-up of a horizontal anaerobic fixed bed reactor (HAFBR) followed by an upflow anaerobic sludge blanket (UASB) for the slaughterhouse wastewater treatment. HAFBR was filled with bamboo rings and had 1.2 m in length, 0.10 m in diameter and volume of 7.5 L. The UASB had the volume of 15 L. The HAFBR and UASB operated at organic loading rate and hydraulic retention time average of 8.46 and 3.77 kg m-3 d-1 of COD and 0.53 and 0.98 days, respectively. During 150 days of monitoring system it was found pH 6.8, relatively high values of bicarbonate alkalinity (> 1000 mg L-1) and reduced values of volatile acids (70 to 150 mg L-1), which afforded average removal efficiencies of COD total and total suspended solids of the order of 31 and 23% in HAFBR and 79% and 63% in UASB. It can be concluded that the generation and consumption of bicarbonate alkalinity and total volatile acids, thereby maintaining the pH during the study indicated stable operation of the reactors. The COD removal in the reactors was satisfactory especially when it considers that the assessment was conducted in a period of adaptation of organisms to the effluent and also the high organic load applied during this period.

Simultaneous photocatalytic oxidation of pharmaceuticals and inactivation of Escherichia coli in wastewater treatment plant effluents with suspended and immobilised TiO2

2012 ◽  
Vol 65 (11) ◽  
pp. 2016-2023 ◽  
Author(s):  
Cristina Pablos ◽  
Rafael van Grieken ◽  
Javier Marugán ◽  
Alejandra Muñoz
Keyword(s):  
Escherichia Coli ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Photocatalytic Oxidation ◽  
Emerging Contaminants ◽  
Fixed Bed ◽  
Treatment Plant ◽  
Fixed Bed Reactor ◽  
Low Concentrations ◽  
Chemical Composition Of Water

Simultaneous Escherichia coli inactivation and oxidation of pharmaceuticals in simulated wastewater treatment plant effluents has been investigated using a photocatalytic treatment with TiO2 in suspension and immobilised onto a fixed-bed reactor. Non-photocatalytic reference experiments of dark adsorption and photolysis showed a higher sensitivity of E. coli towards the chemical composition of water in comparison with the concentration of pharmaceuticals that remains unaffected. Moreover, it must be underlined that the presence of pharmaceuticals (including antibiotics) did not seem to affect the bacterial viability at such low concentrations. Concerning photocatalytic experiments, both suspended and immobilised TiO2 were able to simultaneously inactivate and oxidise both kinds of pollutants (bacteria and pharmaceuticals). The fixed-bed reactor showed similar activity to that of the slurry without deactivation after several cycles of reuse. That makes TiO2 photocatalysis a quite interesting technology for the treatment of drinking water supplies or wastewater plant effluents, allowing the removal of emerging contaminants such as pharmaceuticals during the disinfection treatment.

scholarly journals PENGOLAHAN LIMBAH CAIR INDUSTRI PERCETAKAN UANG KERTAS (UTAS) MENGGUNAKAN PROSES BIOLOGIS ANAEROB

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Rudi Nugroho ◽  
Ikbal Mahmud ◽  
Nurtya Sulasmi
Keyword(s):  
Wastewater Treatment ◽  
Fixed Bed ◽  
Domestic Wastewater ◽  
Full Scale ◽  
Cod Removal ◽  
Laboratory Scale ◽  
Fixed Bed Reactor ◽  
Optimum Conditions ◽  
Treatment Technology ◽  
Anaerobic Bioreactor

A research of wastewater treatment technology come from money producing industry was conducted in laboratory scale using 10 lt of Anaerobic Fixed Bed Reactor. The money producing wastewater was treated by mixing with domestic wastewater with various compositions. The wastewater was fed into the bioreactor by draw and fill daily.The results show that the optimum of COD removal is 52,5%, optimum loading is 0, 95 g-COD/l/day and optimum flowrate is 0,5 l/day. The optimum compossition of money producing wastewater towards domestic wastewater is 30%. These optimum conditions can be used as a designed criteria for full scale of anaerobic bioreactor in the money producing industry. Katakunci : Wastewater, Anaerobic, Fixed Bed Reactor

Influence of Endogenous OUR Determination on the KLa$${K_L}a$$, Exogenous OUR, Total Oxygen Consumption and Heterotrophic Yield in a Completely Mixed Batch Reactor

2014 ◽  
Vol 12 (2) ◽  
pp. 695-704 ◽  
Author(s):  
R. Zamouche-Zerdazi ◽  
M. Bencheikh Lehocine ◽  
A.-H. Meniai
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Batch Reactor ◽  
Total Oxygen ◽  
Biomass Activity ◽  
Biological Reaction ◽  
Global Nature

Abstract In wastewater treatment, waste removal and biomass activity are important processes which need to be monitored for a good process control. The difficulties in the interpretation of the total COD, BOD and VSS measurements encouraged the development of respirometric methods for assessing the kinetic constants. Respirometry is an important technique in assessing biological reaction in wastewater treatment. $${K_L}a$$, depends on endogenous oxygen uptake rate (OURend), is a key constant in evaluating respirogram-specific parameters. Generally, OURend is assumed constant in the dissolved oxygen equations. However, it is not the case. Consequently, this paper deals with the influence of OURend calculations region on $${K_L}a$$ determination, exogenous oxygen uptake rate (OURexo), total oxygen consumption and heterotrophic yield (YH). It was shown that the value of OURend and $${K_L}a$$ varied considerably, a maximum of 56%, depending on where to consider Cfin, on the oxygen concentration variation curve. Even though, the variation on OURend and $${K_L}a$$ is important its influence on Yo/x and YH is attenuated to 7.5% and 6%, respectively. This may be due to the local nature of the first parameters (OURend and $${K_L}a$$) and the global nature of the later ones. Moreover, this can be seen through the variation of the calculated amount of oxygen consumed (QThete) which is of the order 7.6%.

Apport des mesures respirométriques à la gestion d'une station d'épuration à boues activées

1998 ◽  
Vol 25 (2) ◽  
pp. 353-359
Author(s):  
B Weiss ◽  
N Roche ◽  
O Potier ◽  
M -N Pons ◽  
S Gauthier ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Oxygen Uptake ◽  
Activated Sludge ◽  
Control Strategy ◽  
Biological Process ◽  
Wastewater Treatment Plants ◽  
Good Control ◽  
Biological Sensors ◽  
Uptake Rates ◽  
First Results

New regulations for wastewater treatment that will insure greater reliability of the wastewater treatment plants are being established, that is to say in the case of an activated sludge plant, a better control of the biological process. The use of biological sensors would appear to increase the reliability of the plants by allowing the assessment of some characteristic variables of the process and by detecting as quickly as possible the influx of a toxin that is able to inhibit the biomass. We created a biosensor that measures oxygen uptake rates. According to the first results obtained, the data could lead to a good control strategy of the activated sludge process.Key words: wastewater treatment, activated sludge, respirometry, control.

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