1 BIOREMEDIATION OF CRUDE OIL & A CASE STUDY by Nilüfer ÖZKOVALAK İstanbul, 2005
2 OUTLINE Petroleum Hydrocarbon TPH (Total Petroleum Hydrocarbon) Analysis Treatment Methods Bioremediation Oil Gator A Case Study Conclusion
3 Petroleum Hydrocarbons Crude oil contains a complex mixture of compounds, mainly hydrocarbons. The major constituents of crude oil are grouped into four major classes: the saturated compounds, the aromatics, the resins, and the asphaltenes.
4 Total petroleum hydrocarbons (TPH) Total petroleum hydrocarbons (TPH) is a term used to describe a large family of several hundred chemical compounds that originally come from crude oil. There are so many different chemicals in crude oil and in other petroleum products, it is not practical to measure each one separately. However, it is useful to measure the total amount of TPH at a site. Some chemicals found in TPH are hexane, jet fuels, mineral oils, benzene,toluene, xylenes, naphthalene, fluorene and etc
5 EPA Method TPH ANALYSIS it does not provide information on the composition depends on the ability of the solvent used to extract the hydrocarbon from the environmental media and the absorption of infrared (IR) light by the hydrocarbons in the solvent extract. is not specific to hydrocarbons and does not always indicate petroleum contamination. EPA Method 8015 Modified reports the concentration of purgeable and extractable hydrocarbons; these are sometimes referred to as gasoline and diesel range organics.
6 Soil & Petroleum Destroy plants on the soil Groundwater pollution Destroy ecological balance
7 Petroleum spreading in permeable soil
8 Petroleum spreading in impermeable soil
9 Petroleum spreading in permeable soil
10 Petroleum spreading in permeable soil CH 3 Anaerobic degradation
11 Petroleum spreading in impermeable soil
12 Health Effects of PHP Compounds affect central nervous system nerve disorder called "peripheral neuropathy ; effects on the blood, immune system, lungs, skin, and eyes; reproduction and the developing fetus in animals.
13 Treatment Methods of TPH Petroleum-contaminated soil is treated using three processes: Physical (landfill, incineration, thermal treatment) Chemical (chemical oxidants), and Biological (bioremediation, phytoremediation, soil washing with biosurfactants).
14 Physical Treatment Methods disposal in a landfill, and incineration thermal treatment (thermal desorption) expensive. Incineration is also a source of air pollution Thermal desorption involves heating soil to F. Thermal treatment differs from incineration because there is no combustion of the soil.
15 Chemical Treatment Methods Chemical treatment includes direct injection of chemical oxidants into contaminated soil and groundwater. Altering native chemistry. Hydrogen peroxide -this process delivers oxygen to stimulate the activity of naturally occurring microorganisms by circulating hydrogen peroxide through contaminated soil to speed the natural biodegradation of organic contaminants.
16 Biological Treatment Methods bioremediation phytoremediation, soil washing with biosurfactants
17 BIOREMEDIATION Bioremediation is a treatment process that uses naturally occurring microorganisms (yeast, fungi, or bacteria) to break down, or degrade, hazardous substances into less toxic or nontoxic substances. The microorganisms break down the organic contaminants into harmless products- mainly carbon dioxide and water.
18 BIOREMEDIATION ( con t) The specific bioremediation technology used is determined by The type of the microorganisms The site conditions The quality and the toxicity of the compounds
19 BIOREMEDIATION ( con t) Bioremediation applications fall into two broad categories: in situ-treats treats the contaminated soil or groundwater in the location in which it was found. ex situ - require excavation of contaminated soil or pumping of groundwater before they can be treated
20 BIOREMEDIATION ( con t) In Situ Bioremediation Bioaugmentation involves the introduction of microorganisms that have been cultured to degrade various chains of hydrocarbons into a contaminated system. Biostimulation introduces additional nutrients in the form of organic and/or inorganic fertilizers into a contaminated system, which increases the population of the indigenous microorganisms. Various nutrient sources such as inorganic fertilizer, urea, sawdust, compost, manure, and biosolids have been used in biostimulation Bioventing systems deliver air from the atmosphere into the soil above the water table through injection wells placed in the ground where the contaminants exists.
21 BIOREMEDIATION ( con t) Ex Situ Bioremediation Slurry-phase bioremediation-contaminated soil is combined with water and other additives in a large tank called a bioreactor and mixed to keep the microorganisms inn contact with the contaminants in the soil. Solid-phase bioremediation-is is a process that treats soils in above- ground treatment areas equipped with collection systems to prevent any contaminant from escaping the treatment. Solid-phase soil treatment processes include Landfarming- contaminated soils are excavated and spread on a pad with a built-in in system to collect any leachate or contaminated liquids that seep out of contaminant-soaked soil. Biopiles-Contaminated soil is piled in heaps several meters high over an air distribution system. Composting- Biodegradable waste is mixed with a bulking agent such as straw, hay, or corn cobs to make it easier to deliver the optimum levels of air and water to the microorganisms. Three common designs are static pile composting,mechanically mechanically agitated in-vessel composting,, and windrow composting.
22 The advantages of in-situ bioremediation BIOREMEDIATION ( con t) the contaminated soils do not require excavation and treatment before or sometimes after less expensive the process creates less dust there is less volatilization of contaminants it is possible to treat a large volume of soil at once are most effective at sites with permeable (sandy or uncompacted soil) can be used to considerable depths
23 BIOREMEDIATION ( con t) The advantages of ex-situ bioremediation the rate of bioremediation is often significantly faster than in-situ the bioremediation process is easier to control can treat a wider range of contaminants and soil types are most effective at sites where the soil is impermeable (clays, compacted soils) and where there are highly layered subsurface environments (because oxygen can not be evenly distributed in- situ throughout the treatment area) they may be used as an intermediate step to reduce contaminant burden and so reduce landfill costs it is not necessary to know the precise nature and spatial distribution of the contamination contaminant distribution can be made relatively homogenous can more easily prevent the migration of gases and liquids off- site remediation progress can be more easily monitored
24 OIL GATOR The primary product is based upon a biodegradable by-product of the cotton seed delinting process. Cotton seeds are acidified and scrubbed to remove their lint, prior to grading and packaging. The product contains 95% cellulose and 5% proprietary compounds compounds which act as both nutrients and electron acceptors for the indigenous microorganisms. When treated, the cellulose lint also becomes an effective sorbent that preferentially absorbs hydrocarbons in the presence of water, and which supports the growth of naturally occurring, hydrocarbon- reducing bacterial forms. These groups of microorganisms rapidly degrade the sorbed hydrocarbons into simpler organic compounds, and eventually into carbon dioxide and water.
25 Bacteria in the Cellulose Fiber
26 OIL GATOR ( con t) The results of the viable cell counts are approximated as follows: aerobic heterotrophic bacteria (can use any carbon source)100,000 count/gram Oil Gator anaerobic heterotrophic bacteria (can use any carbon source) 100 count/gram Oil Gator petrophilic bacteria (petroleum degraders) 1000 count/gram Oil Gator
27 OIL GATOR ( con t) Features & Benefits In-situ or ex-situ treatment methods can be used Eliminates leachate problems (without the need for site liners), thereby protecting groundwaters and nearby inland and coastal waterways. Avoids nutrient overdosing with its associated eutrophication problems. Targets a variety of different hydrocarbon contaminants simultaneously. Can be used safely in urban settings, reducing the need for transportation of hazardous wastes Cost effective in terms of time, labour and financial outlay. Eliminates the need to landfill many forms of hydrocarbon contamination
28 OIL GATOR ( con t) Bioremediation with Oil Gator Oil Gator contains the naturally occurring microorganisms and nutrients to degrade the absorbed hydrocarbons into simpler organic compounds, and eventually to carbon dioxide and water. To bioremediate, Oil Gator requires no surfactants- thus problems with the leaching of toxic surfactants are eliminated. Oil Gator also does not require nitrogen or nutrient addition. These nutrients are encapsulated in the fibres of the Oil Gator Oil Gator contains a wide variety of aerobic and anaerobic micro-organismsorganisms which allows the remediation of a wide range of hydrocarbons, including compounds typically difficult to degrade, such as PAH s and PCB s. Oil Gator can remediate the contaminant hydrocarbon in-situ (in-place) thus eliminating the need for digging up and landfilling contaminated soil, and eliminating the use of ex- situ landfarming where land space is at a premium.
29 OIL GATOR (con t) The sorption properties of Oil Gator are based on its ability to draw the target liquid into the inside of its tube-shaped cellulose fibers. It is the capillary action of these fibers, which sorbs and encapsulates the liquid, and prevents leaching. The fibers appear to have a higher affinity for hydrocarbons (oils) than for aqueous solutions, possibly because the fibers originate from an oil-bearing plant. The sorption properties of the Oil Gator fibers are thus dependent on the physical properties of the liquid being sorbed particularly its viscosity.
31 OIL GATOR (con t) Dichlorobenzene(s) Pentane Dichloromethane (Methylene Chloride) PAH s (PolyAromatic Hydrocarbons)* Diesel Fuels* PCB s (PolyChlorinated Hydrocarbons)* Ethanol Styrene Ethyl Benzene* Tetrachloroethane Ethyl Ether Tetrachloroethylene (Perchloroethylene) Ethylene Chloride (1,2Dichloroethane) Tetrahydrofuran Ethylene Glycol Toluene* Gasoline/Petrol* Trichloroethylene Heptane Unleaded Petrol* Hexachlorobenzene Varsol* Hexane Xylenes* * Denotes specific hydrocarbons that have been bioremediated by Oil Gator
32 A CASE STUDY: BIOREMEDIATION OF CONTAMINATED SITE WİTH OIL GATOR Contaminated Site: Approximately 1000 m2 agricultural area Amount of used product: 14 bags (approximately 192 kg) Oil Gator Required time for Application: 9 hours
33 A Case Study(con t) At first soil samples were taken from 20 different points of the contaminated site. The samples were homogenized and two different test were applied ; TPH and leached TPH The first day of application was accomplished on 400 m2 of the area. At first Oil Gator was spread and waited two hours in order to absorb the crude oil by Oil Gator.
34 A Case ( con t ) Study After the two hours contaminated soil was mixed with Oil Gator. The second day of the application was accomplished on 600 m2 of the area. The same application procedure done on the first day was applied to the 600 m2 of the area.
35 Before the Oil Gator Application After the 35 day During the Oil Gator Application After 51 day
36 Results Sample Number GP GP GP GP GP GP 760/05/SS/01 760/05/SS/ /05/SS/ /05/SS/ /05/SS/ /05/SS/02-5 Date TPH (ppm) Leached TPH (ppm)
38 ( con t ) RESULTS 120 Remained Pollution Ratio 100 Reduced Pollution Ratio TP H (% ) After the 188 day of the Oil Gator application the remained pollution ration was 0.17% and the the reduced pollution ratio was 99.83%
39 ( con t ) Results Before the Oil Gator Application After the Oil Gator Application Leached TPH was reduced ppm to ppm and after the 188 days the leached TPH was lower than 1 ppm
40 ( con t ) Results Wheat grown in nonpolluted area Wheat grown in polluted area Humidity Protein Humid Dry Glutein Glutein Width Lenght There was no difference between grown wheat in impolluted and polluted area Humidity Protein Humid Glutein Dry Glutein Width Lenght
41 Conclusions The analyzes showed that the amount of TPH was reduced from 129,300 to 216 ppm after 188 days. Reduction in TPH amount proved that Oil Gator absorb the crude oil. Similarly, parallel with reduced TPH analayzes done with grown wheat in the contaminated area proved that result since there was no difference between the wheat grown in contamanted and clean area. The results showed that Oil Gator can be used in bioremedition of the contaminated soil with crude oil. Also, according to EPA and some Eurpean countries legislaiton soil which has TPH lower than 1000 ppm can be used for general purposes.
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