Microbial Communities Associated with Hydraulic Fracturing Background Information Microbial

Hydraulic fracturing is also known as “fracking” is a technique which involves drilling down, then horizontally as far as 10,000 feet below the surface to release natural gasses stored in the sedimentary rock known as Shale. The channel is then encased with concrete or occasionally steel to allow millions of gallons of water to be injected into the wellbore. Most water used in fracking comes from surface water sources such as rivers, lakes, or other accessible bodies of water nearby. Not only is there water being funneled into the wellbore, but also a mixture of sand and other chemicals. When the high-pressure mixture is injected underground it fractures the Shale around the wellbore and creates fissures. The fissures are then held open with

The actual technique involves “pumping a slurry of water, sand and chemicals underground to fracture shale formations and release hydrocarbons” ("Fracking", 2013, p. 276). Modern procedures use a high degree of manipulation in order to extract the natural gas. The natural gas from fracking is dispersed in rock, and can only be retrieved by using specialized removal techniques (Palliser, 2012). These specialized techniques have many unintended consequences. For instance, the current method of fracking may cause the issue of flowback. Flowback occurs when the internal pressure of the rock formation causes the injected watery, chemical mixture to return to the surface with other naturally occurring substances (Palliser, 2012). This flowback is often injected back underground or can be processed by wastewater treatment plants, where it is later discharged as surface water (Palliser, 2012). Indisputably, the disposal and generation of flowback is one of the main concerns regarding hydraulic fracking. The wastewater developed from fracking procedures is often inappropriately handled and is sometimes sprayed onto rural roads and forests (Finkel & Hays, 2013). As a result, the surface water may come in contact with living organisms and can cause a plethora of issues. For fracking opponents, their driving force is the ill effects of fracking on the environment and overall health. Similarly, the possibility of drinking or coming in contact with chemically laden byproducts

Hydraulic Fracturing is a process where high-pressure fracking fluids are forced into rich shale to extract natural resources. These fracking fluids are a mixture of proppants and “chemical additives such as surfactants, biocides, fiction reducers and other compounds meant to help in the process of freeing the trapped gas”. In addition, the million gallons of water injected along with the fracking fluids return as flowback water and this produced water have the “potential to mix with nearby aquifers and surface water”. As a result, there is a considerable amount of public concern about water contamination due to this process of hydrofracking (Thurman, Ferrer, Biotevogel & Borch, 2014).

people are agents the process of drilling for the natural gases. However, …“A report in

The Gordalla et al paper is a toxicology study of the constituents of fracking fluids and flow back water and its impact on drinking-water wells. Data used in the study is based from ExxonMobil drilling sites in northern Germany. The paper relates to the New York Times article as they both tackle the question of the impacts of fracking on groundwater. The paper lists down the different chemicals used in fracking-fluid and ranks them by their projected

The Marcellus Shale rock formation harbors the largest natural gas reserve that runs from New York to Tennessee. (Federman 2010 p.35) The only way to extract the natural gas is to use the process of hydrofracking. The process of hydrofracking uses a mixture of water, sand and chemicals to drill and fracture the Marcellus Shale to extract the natural gas. Clean water is used from local aquifers to produce the water mixture called “slurry” which is made up of 99% clean water (Rush 2010 p.28). The slurry additives are described in the journal article “In the Wake of the Shale Revolution: A Primer on Hydraulic Fracturing Fluid Chemical Disclosure” as, 3

The water mixture used to break the shale rock contains sand as well as over 600 different chemicals. The amount of water needed just for one gas well to take place is over eight million gallons. Not only do these natural gas wells use up so much water, the methane gas and chemicals in the water contaminate nearby groundwater, causing the people who drink it to become very ill and suffer serious mental and physical injuries. Most of these companies who are in the business of drilling gas wells do not show what really goes on behind the scenes. The leftover fracturing fluid, which are retrieved after the fracking, is only half of what first went down the well. Not only is this a problem because the chemicals that are left sink further down into the ground but they are also not biodegradable, which could go on to contaminate more

The ten most abundant bacterial families detected in our study were Koribacteraceae (Acidobacteria), Acidobacteriaceae (Acidobacteria), Sphingobacteriaceae (Bacteroidetes), Geobacteraceae (proteobacteria), Auto67-4W (Pedosphaerae), Acetobacteraceae (proteobacteria),

Hydraulic fracturing pumps a cocktail of water and chemicals into the ground. The pressure fractures shale rock, which releases oil, natural gas and wastewater back to the surface. This wastewater is stored temporarily in storage containers, before typically being deposited back underground in sealed storage wells.

In the process of fracking, problems can occur and there can be a possibility of water contamination. During fracking underground water supplies can be exposed to shale gas and contaminate the water or there could be a cement failures and infiltration from soil or even water transportation incidents (Beaver 127; Penning et al. 1156). This can happen very easily and can cause the water to get contaminated. In one case, “EPA found evidence of groundwater contamination with benzene, xylenes, gasoline range organics, diesel range organics, and total volatile hydrocarbons in shallow wells that lie above 169 gas-producing wells that were hydro fractured.”(Penning et al. 1156). Most of these chemicals found in the water are harmful to the body, can

Hydraulic fracturing is a process used in nine out of 10 natural gas wells in the United States, where millions of gallons of water, sand and chemicals are pumped underground to break apart the rock and release the gas. Scientists are worried that the chemicals used in fracturing may pose a threat either underground or when waste fluids are handled and sometimes spilled on the surface. The natural gas industry defends hydraulic fracturing, better known as fracking, as safe and efficient. Thomas J. Pyle, president of the Institute for Energy Research, a pro-industry non-profit organization, claims fracking has been “a widely deployed as safe extraction technique,” dating back to 1949. What he doesn’t say is that until recently energy

Genomic “data products” extracted from engineered shale gas ecosystems will provide baseline information on well souring and corrosion potential, insight into the effects of biocides and gelling agents, and growth conditions in frac fluids supporting microbial

In the article, “Hydraulic Fracking Threats to Species with Restricted Geographic Ranges in the EasternUnited States”, the authors describe the effects that fracking has on the environment, to include thespecialized plant life in the region surrounding the Marcellus Shale deposit. The Marcellus Shale Depositspans through the following states: New York; Pennsylvania; Virginia, West Virginia; and Kentucky. Theregion mentioned is the location of the Appalachian Mountains, and is home to many diverse andlocalized populations of flora and fauna. The study conducted was focused on the range, naturalhistory, habitat needs, and legal history. The study also utilized the 35% overlap as the determiningcriterion for the selected study. In this result there are 15 species that are inclusive to this geographicalrange.

While vertical wells do yield gas, they are mainly used as a base to connect several horizontal wells, which is where the money lies in the industry. After drilling, about “2 million to 10 million gallons of water [is used] to extract the gas” (Marsa 3-4). However, high pressured water alone will not break away the shale rock, therefore sand is added to enable further fracturing. The controversial issue fueling the debate is the third substances added to the water which allow the natural gas to escape for collection. “A cocktail of friction-reducing lubricants [are used] to make the water slick enough to slide through the pipes swiftly” (Marsa 4). A geochemist by the name of Tracy Bank conducted a study at SUNY Buffalo which concluded that the lubricant contained an abundance of toxic metals, “including uranium, barium, chromium, zinc and arsenic” (Marsa 2). This is just a short list of the negative compounds used in fracking. It is likely that the public will never get the full story as to the composition of the lubricants, as major fracking companies refuse to release that information, “claiming that doing so would reveal trade secrets” (Rahman 1). So where do these contaminants end up? After reaching the surface, the waste is emptied into tanks for storage. However, sometimes ponds are also used to hold the pollutants, therefore releasing the harmful toxins into runoffs. Once the gas has

Another problem that we know exists with hydraulic fracturing is the contamination of the water, the ground, and the air around the sites (Goldman pg. 2). It has been shown that “…residents living near the hydraulic fracturing sites are increasingly worried that the drilling process might be contaminating their well water, polluting streams, and releasing toxic gases into the air (Hobson).” Water sources, as well as the soil, are often polluted from flowback fluid and from production brine (Hydro-Fracking pg.4). Flowback fluid is “the contaminated fluid that returns to the surface during the drilling process, and is estimated to be between 9% - 35% of the fluids injected during