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Groundwater Remediation. EPA Region III Superfund Site Sarah Shaffer Honors Engineering Science I. Importance of Groundwater. Drinking water and wells. Pennsylvania Water Use. In Pennsylvania, public supply water makes up 14% of total water supply and 30% comes from rural supply.

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Groundwater remediation

GroundwaterRemediation

EPA Region III Superfund Site

Sarah Shaffer

Honors Engineering Science I


Importance of groundwater

Importance of Groundwater

Drinking water and wells


Pennsylvania water use
Pennsylvania Water Use

  • In Pennsylvania, public supply water makes up 14% of total water supply and 30% comes from rural supply.

  • 100% of PA’s water comes from underground sources.


The hydrologic cycle
The Hydrologic Cycle

  • Precipitation

  • Run off

  • Recharge

  • Saturated Zone

  • Impervious Rock Bed

  • Water Table

  • Evaporation

  • Transpiration


Drinking water standards
Drinking Water Standards

  • MCGL ( Maximum Contaminate Goal Level) is set for the contaminate.

  • MCL (Maximum Contaminate Level) is then set for contaminate.

  • EPA sets standards and tests wells for contaminates.


Tranguch site history

Tranguch Site History

EPA Region III Superfund Site.


Investigation
Investigation

  • Between Sep. 1993 and Jan. 1994 the sewer systems were inspected.

  • Gas was found to have infiltrated the sewer system

  • DEP began monitoring indoor air conditions in 48 homes surrounding Tranguch.



Responsibility
Responsibility

  • 7 Active or closed body shops, gas stations and garages were initially thought to be responsible.

  • Formal notices were issued to these businesses to conduct site characterizations.


Site characterization
Site Characterization

  • The Site Characterization preformed by these businesses required-

  • The testing of Underground Storage Tanks (UST’s) for any leaks, cracks or possible contamination.

  • The analysis of the soil under and around the tanks to determine if any signs of earlier or present day contamination is evident.


Contamination study
Contamination Study

  • Routine sampling of 20 groundwater monitoring wells.

  • Thorough study of mining data and maps.

  • Groundwater sampling survey.

  • Analysis and plotting of all data.

  • 50 samples taken up and down gradient.

  • Time period: 1993-1995.


Contamination determined
Contamination Determined

  • The site characterization was completed and the contaminated area was found to be, from Tranguch, south to 17th street; north to 23rd street; east to Meade street; and west to Routes 309-940.



Benzene
Benzene

  • The maximum contaminate level goal is set at 0

  • The maximum contaminate level is set at 5 parts per billion.

  • Total releases of benzene between 1987 and 1993 total over 2 billion lbs.


Benzene in water
Benzene in Water

  • Benzene is somewhat soluble in water making it hard to remediate.

  • If benzene is in surface water it will evaporate.

  • Benzene can contaminate wells if present in groundwater.


Acute myelogenous leukemia
Acute Myelogenous Leukemia

  • Acute Myelogenous Leukemia is the rapid progression of a cancer of the blood, characterized by an overproduction of immature white blood cells taking majority of the bone marrow.


Health effects
Health Effects

  • Twenty or more years may pass before symptoms are noticed.

  • Known to cause Acute Myelogenous Leukemia.


Health effects cont
Health Effects (cont.)

  • Benzene also causes:

  • Anemia

  • Excessive bleeding

  • Decreased ovary size

  • Menstrual disorders

  • Impair fertility

  • Damage to nervous system.

  • Increase in infection chances.

  • Lung and bladder cancers


Surprise
Surprise!!!!!

  • A major portion of Benzene contamination is found in cigarette smoke.

  • Benzene traces are also found on meat, eggs, fruit and vegetables.


How benzene causes harm
How Benzene Causes Harm

  • Enters bloodstream.

  • Carried into bone marrow and fatty tissues

  • Passes through liver and is broken down

  • Harmful metabolites are formed.

  • Some Health problems are caused by these metabolites present in the body.


Ethyl benzene
Ethyl Benzene

  • Ethyl benzene is a benzene derivative and it behaves much like benzene in the environment and in water. The health effects are also very similar.


Toulene
Toulene

  • Toulene (or methyl benzene) is also another benzene derivative, therefore it also behaves like benzene in reference to the environment and health effects.


Xylene
Xylene

  • Xylene is 6- 15% ethyl benzene.

  • Another name is dimethyl benzene.

  • It also behaves like benzene in reference to environment and health problems.


Naphthalene
Naphthalene

  • No mcl set by EPA.

  • White solid.

  • Used as insect repellent.

  • Also present in water at Tranguch.


In situ bioremediation
In Situ Bioremediation

  • Managed or spontaneous process

  • Microbiological process used to degrade or transform contaminates into non toxic forms.

  • Therefore mitigating or eliminating contamination.


Basically
Basically….

They send little bugs down wells and they keep the bugs alive so that the bugs can eat the contaminates and leave behind traces of non toxic substances such as water and carbon dioxide.



Electrokinetics
Electrokinetics

  • Elecktrokinetics seprates and extracts contaminates from soils, sludges, sediments and groundwater.

  • Goal is to effect migration of contaminates in an imposed electric field via electroosmosis, electromigration, and electrophoresis.

  • It works when the soil is electrically charged with a low voltage current.


Basically1
Basically….

  • They give water, soil and sludge a shot of electricity and through the use of several different biological occurances, the contaminate is shocked out of the stuff.


In situ flushing
In Situ Flushing

  • In Situ flushing involves the injection or infiltration of an aqueous solution into a zone of contaminated soil/groundwater.

  • This is then followed by a downgradient extraction of groundwater and elutriate (flushing solution mixed with contaminates.) and aboveground treatment and discharge or re- injection.


Basically2
Basically….

  • In Flushing they send down a mixture that flows down the plume and catches the contamination before they pump the water back out and treat it.

  • It basically helps make the treating job easier for the equipment.


Air sparging
Air Sparging

  • Air sparging involves injecting a gas (usually air or oxygen) under pressure into the saturated zone to volatize groundwater contaminates and to promote biodegradation in saturated and unsaturated soils by increasing subsurface oxygen concentrations.

  • They are then extracted using a vacuum, generally by soil vapor extraction systems.

  • This is an EPA approved method of remediation.


Basically3
Basically….

  • Pressurized air is put into the water and increases the surface area making it easy to pull the contaminates off the surface area of the water. This uses Henry’s Law and will be discussed later.


Bioslurping
Bioslurping

  • Bioslurping involves the simultaneous application of vacuum enhanced vapor extraction, recovery and bioventing to address LNAPL contamination.

  • Vacuums are used to remove free product along with some groundwater and vapor extraction is used to remove high volatility vapors.

  • Bioslurping is made up of a well with an adjustable slurp tube that is lowered into the LNAPL layer and is used to pump contaminates out.


Basically4
Basically….

  • A pump slurps up all the contaminates with a little bit of water. Kind of like slurping little pieces of chocolate leftover from your hot chocolate.


Horizontal wells
Horizontal Wells

  • This technology can be incorporated into many other different technologies such as bioremediation, air sparging, vacuum, and soil flushing.

  • Their long horizontal form makes them suitable for covering a long range of contaminated area.


Ultraviolet treatment
Ultraviolet Treatment

  • UV disinfection works by exposing waterborne microorganisms to UV light at a specified intensity for a specified period of time. This process of germicidal UV light renders microorganisms , in effect, “microbiologically dead.” It does so by penetrating the cell wall and affecting the DNA in such a way that the cell cannot reproduce.


Phytoremediation
Phytoremediation

  • Phytoremediation uses plants to cleanup contaminated soil and groundwater, taking advantage of the plants natural abilities to take up, accumulate, and or degrade constituents of their soil and water environments.


Air stripping
Air Stripping

  • Air Stripping takes advantage of the effect of faster contaminate removal with greater surface area. It maximizes the amount of water in contact with air so the contaminate is removed quickly, generally in matter of seconds.


Air stripping1
Air Stripping

  • The most common use of air stripping is through a packed tower.

  • You can also use air stripping technology through aeration tanks, trays, but all use the same technology of large surface area and small amounts of water.


Granular activated carbon
Granular Activated Carbon

  • GAC consists of aprx. 1 mm sized carbon grains. Their effectivness depends on adsorption ( a process were a molecule adheres to the surface of a substance.)

  • The carbon is dehydrated, crystallized, heated with steam to create pores. This gives GAC a huge surface area. A handful of GAC has a larger surface area than ten football fields.


Maxi strippers

Maxi Strippers

Inventor: Randy Galgon

Hazleton Environmental


Maxi strippers1
Maxi Strippers

  • The Maxi Strip SP technology is built on three foundational fluid dynamic concepts

  • Boundary Layer Control

  • Cavitation

  • Aspiration


Maxi strippers cont
Maxi Strippers (cont.)

  • The maxi stripper accelrates the fluid stream on the undersidde of the deflector plate thereby reducing the thickness of the wall between liquid and gas. By reducing the size of this wall the resistance to mass transfer is lowered.


Maxi strippers vs packed towers
Maxi Strippers vs. Packed Towers.

  • The difference between the Maxi Air Stripper and the conventional packed tower is the fact that a packed tower actually increases the resistance to mass transfer by increasing the thickness of this boundary layer wall. As the water spreads out over a piece of packing the boundary layers get thicker, increasing the resistance to mass transfer.


Henry s constant
Henry’s Constant

  • Henry’s constant is what enables all stripping systems to work. Sparging systems and various other pieces of equipment also rely on this law. Henry’s constant is found by dividing the Vapor Pressure over the solubility.


Epa s site characterization

EPA’s Site Characterization

EPA Region III Superfund Site


Water chemistry
Water Chemistry

  • Ph: 7.1

  • Total hardness: 84.4 mg/L

  • Iron: 8.2 mg/L

  • Manganese: 4.6 mg/L

  • Magnesium: 2.5 mg/L


Contaminates
Contaminates

  • Benzene: 1.6 mg/L

  • Naphthalene: 0.66 mg/L


Design conditions
Design Conditions

  • Expected Flow Rate: 25 gpm (gallons per minute)

  • Maximium Flow Rate: 45 gpm


Predicted air stripper preformance
Predicted Air Stripper Preformance

  • Design Feed Rate: 25gpm

  • Benzene Influent: 1800ppb Effluent: 1

  • Naphthalene Influent: 660ppb Effluent: 300

  • A three modular Maxi Strip Model 300H is recommended.

  • Off Gas Total VOC: 1250 lbs/day.




Gravity separator
Gravity Separator

  • The gravity Separator uses a oil and water effect. The contaminated water is pumped through and the oil is allowed to separate onto the bottom before being pumped out as sludge.


Stripping system
Stripping System

  • Made up of three Maxi Air Strippers.

  • Water is pumped in and circulated through the three pump system


Vapor phase carbon
Vapor Phase Carbon

  • This carbon cleans the air that circulates throughout the stripping system.


Filtrate tank
Filtrate Tank

  • The Filtrate Tank holds water that is ent form the backwash tank and re-circulates back through the system to flush some of the filters out.


Incline plate clarifier
Incline Plate Clarifier

  • Holes ARE placed on a grate and the water is pumped from the stripping system over this incline plane. The holes in the plate are sized to induce a calculated pressure drop to ensure the feed is hydralically distruibuted equally among the plates.

  • The solids settle on the plates and the water flows through.


Secondary dewatering
Secondary Dewatering

  • This is were all the sludge and contaminates from the equipment is pumped and then is compressed and thrown in a dumpster before being taken to a landfill.


Pressure filter
Pressure Filter

  • The pressure filter is full of various layers of sand. The top layer is a very course sand or gravel and as the layers increase the sand becomes finer. Thus the particles are trapped in the sand particles as it flows down through.


Polishing carbon
Polishing Carbon

  • Polishing Carbon is used to make sure that any contaminate that the previous systems might have missed is sure to be cleaned out. This ensures the safty of the water and it’s cleanliness.


Backwash tank
Backwash Tank

  • The backwash tank holds some of the clean water so that it can be pumped back through the system to clean the equipment. This dirty water is then held in the filtrate tank and sent back through the system.



Tss calculations
TSS Calculations

  • Equilibrium Ph of 8.5: 9.70lbs/day

  • Total Potential Precipitation: 100%

  • Site Ph of 7.1: 5.74lbs/day

  • Total Potential Precipitation: 59.17%

  • Fixed PH of 5: 5.74lbs/day

  • Total Potential Precipitation: 59.17%


Instead

Instead…..

Wichita, Kansas’s new community center.

Because we all know Hazleton already has a bad reputation.


Gilbert and mosley project cont
Gilbert and Mosley Project (cont)

  • Contains:

  • Environmental education building

  • Groundwater treatment system

  • Plaza area

  • Site improvement items

  • Park shelter

  • Meandering creek


The gilbert and mosley project
The Gilbert and Mosley Project

  • “The Gilbert and Mosley project is considered to be one of the most innovative public private partnerships ever created to solve the complex environmental problem of groundwater contamination….”

    Mayor Bob Knight.


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