scholarly journals BIOREMEDIATION OF CLAY SOILS IMPACTED BY PETROLEUM

2002 ◽  
Vol 1 (2) ◽  
pp. 29 ◽  
Author(s):  
Danielle Marins Pala ◽  
Denize Dias de Carvalho Freire ◽  
Geraldo Lippel Sant’Anna Jr.
Keyword(s):  
Clay Soil ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Clay Soils ◽  
Contaminated Sites ◽  
Removal Rates ◽  
Slurry Phase ◽  
Highly Effective ◽  
Bioremediation Processes

The application of bioremediation processes in recuperating contaminated sites is gaining ground, due to its efficiency in removing a number of different classes of contaminants and its cost, which tends to be lower than that of other technologies. In this work, the influence of some factors that are important for the biodegradation of the petroleum present in clay soil was studied. Experiments were conducted using two types of reactor, a slurry-phase reactor and a fixed bed reactor. The processes employed were shown to be highly effective in decontaminating the soil, achieving removal rates of around 80%.

scholarly journals BIOREMEDIATION OF CLAY SOILS IMPACTED BY PETROLEUM

2002 ◽  
Vol 1 (2) ◽  
Author(s):  
Danielle Marins Pala ◽  
Denize Dias de Carvalho Freire ◽  
Geraldo Lippel Sant’Anna Jr.
Keyword(s):  
Clay Soil ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Clay Soils ◽  
Contaminated Sites ◽  
Removal Rates ◽  
Slurry Phase ◽  
Highly Effective ◽  
Bioremediation Processes

The application of bioremediation processes in recuperating contaminated sites is gaining ground, due to its efficiency in removing a number of different classes of contaminants and its cost, which tends to be lower than that of other technologies. In this work, the influence of some factors that are important for the biodegradation of the petroleum present in clay soil was studied. Experiments were conducted using two types of reactor, a slurry-phase reactor and a fixed bed reactor. The processes employed were shown to be highly effective in decontaminating the soil, achieving removal rates of around 80%.

scholarly journals Production of CO2 in crude oil bioremediation in clay soil

2005 ◽  
Vol 48 (spe) ◽  
pp. 249-255 ◽  
Author(s):  
Sandro José Baptista ◽  
Magali Christe Cammarota ◽  
Denize Dias de Carvalho Freire
Keyword(s):  
Crude Oil ◽  
Petroleum Hydrocarbons ◽  
Clay Soil ◽  
Fixed Bed ◽  
Bacterial Count ◽  
Fixed Bed Reactor ◽  
Total Petroleum Hydrocarbons ◽  
Co2 Production ◽  
Oil And Grease ◽  
Before And After

The aim of the present work was to evaluate the biodegradation of petroleum hydrocarbons in clay soil a 45-days experiment. The experiment was conducted using an aerobic fixed bed reactor, containing 300g of contaminated soil at room temperature with an air rate of 6 L/h. The growth medium was supplemented with 2.5% (w/w) (NH4)2SO4 and 0.035% (w/w) KH2PO4. Biodegradation of the crude oil in the contaminated clay soil was monitored by measuring CO2 production and removal of organic matter (OM), oil and grease (OandG), and total petroleum hydrocarbons (TPH), measured before and after the 45-days experiment, together with total heterotrophic and hydrocarbon-degrading bacterial count. The best removals of OM (50%), OandG (37%) and TPH (45%) were obtained in the bioreactors in which the highest CO2 production was achieved.

Evaluation of COD Removal Performance Based on Organic Acid Decomposition in an Anaerobic Fixed Bed Reactor

1991 ◽  
Vol 24 (5) ◽  
pp. 111-121 ◽  
Author(s):  
M. Kuroda ◽  
Y. Sakakibara
Keyword(s):  
Liquid Flow ◽  
Removal Rate ◽  
Fixed Bed ◽  
Operating Conditions ◽  
Cod Removal ◽  
Fixed Bed Reactor ◽  
Bulk Liquid ◽  
Removal Rates ◽  
Flow Rates ◽  
Biofilm Model

COD removal performance in an anaerobic fixed bed reactor(AAFBR), which treats soluble organic matter, was investigated theoretically by using a simplified biofilm model. The COD removal rate was assumed to be controlled by the decomposition rates of volatile fatty acids such as acetate, propionate and butyrate. The simplified biofilm model took into consideration the effects of intrabiofilm and interbiofilm substrate diffusion rates on substrate biodegradation rates. The COD removal rates in AAFBR were evaluated for various operating conditions by using known kinetic parameters. The calculated results show that the COD removal rates are not affected by adhered biomass provided that the bio-mass is more than about 4 mg-C/cm2, and vary with temperature, bulk liquid substrate concentrations and the bulk liquid flow rates which are in the range 0.01 ~ 1 m/hr. Relations between allowable COD loading rates and packing diameters were shown schematically for different bulk liquid flow rates.

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

Modeling of aerated upflow fixed bed reactors for nitrification

1999 ◽  
Vol 39 (4) ◽  
pp. 85-92 ◽  
Author(s):  
J. Behrendt
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Liquid Phase ◽  
Gas Phase ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Bulk Liquid ◽  
Initial Value ◽  
Fixed Bed Reactors ◽  
Number Of Cells

A mathematical model for nitrification in an aerated fixed bed reactor has been developed. This model is based on material balances in the bulk liquid, gas phase and in the biofilm area. The fixed bed is divided into a number of cells according to the reduced remixing behaviour. A fixed bed cell consists of 4 compartments: the support, the gas phase, the bulk liquid phase and the stagnant volume containing the biofilm. In the stagnant volume the biological transmutation of the ammonia is located. The transport phenomena are modelled with mass transfer formulations so that the balances could be formulated as an initial value problem. The results of the simulation and experiments are compared.

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