A Human-Friendly Method of Treating Acid Mine Drainage

Fossil Fuels are extremely harmful to the environment, especially in the ways the fuel is obtained, such as mining or hydraulic fracturing. Coal, a commonly used fossil fuel, can be obtained by strip mining, mountaintop mining, or underground mining (“Coal Explained”). Strip mining has disastrous effects on the environment because of the destructive nature of the process, which removes all soil, rock, trees, and plants above coal deposits. The runoff from this pollutes streams and rivers nearby, which can harm aquatic life and disfigure the body of water,

There are many factors that contribute to Idaho’s pollution problem, but mining may be the biggest. Mining is a huge industry in Idaho, hence the nickname “The Gem State”. The biggest product from Idaho’s mines is silver. Silver mines are some of the largest polluters in the state. Bunker Hill, or Silver Valley, as the Coeur d’Alene region is known for its numerous mines, was recently named a Superfund site. A Superfund site is a site under protection for removal of toxic wastes by the EPA. Although that beautiful valley was also once known for its abundant wildlife, now the rivers are flooded with phosphorous, selenium, zinc, lead, silver, cadmium, and arsenic, all from tailings of several mines in the region. Lake Coeur d’Alene now contains over 70 million tons of toxic waste sediments in its bottom. This pollution has endangered people in the area for years. In Smelterville, where a smelter ran for nearly 100 years, a large number of people have been diagnosed with health complications caused by extremely high levels of lead and other toxins in their blood. These conditions, for most, have existed nearly all their lives. Many remember being ill for most of their childhood and on. In 1973, before the smelter was closed, the average lead toxin level per deciliter of blood in children tested was 70. A reading of 10 is considered high alert. Rocky Hill, who grew up in Smelterville and

Once these mines were abandoned water slowly began to fill these mines. The water came in contact with all of the leftover minerals, including sulfide, and chemicals began to dissolve into the water. This process of dissolving chemicals into the water essentially turned the water into acid (1). Once the mines finally filled, water began to pour out of the mines into the surrounding area, mostly into a body of water now known as “Tar Creek” (1). This creek then spread the contaminated water throughout the community and into numerous water sources.

There are three main mechanisms by which the chemical composition of groundwater, which is our natural source of drinking water, may be changed: by natural processes, by man's waste-disposal practices such as those for sanitary wastes, liquid industrial wastes, solid wastes, and radioactive wastes, and by spills, leaks, and agricultural activities and other sources unrelated to disposal. The degree of risk posed by contaminants varies according to many factors. These include the volume and toxicity of the contaminant, its concentration in the aquifer, its persistence in the environment, and the degree of human and environmental exposure to the contaminant. In addition, the number of persons affected, or likely to be affected, over time and the percentage of available groundwater both locally and regionally should be taken into consideration. If the contaminants in the groundwater exceed the standards set for drinking water by the federal government, for example, then the water is hazardous for the use for which it was designated under the standards. These standards include, however, only a limited number of chemicals, and thus they do not necessarily protect humans or the environment against either the short-term or the long-term effects of every contaminant that might be found in

Clean coal technology usually addresses atmospheric problems resulting from burning coal. Historically, the primary focus was on sulfur dioxide and particulates, since it is the most important gas in the causation of acid rain. More recent focus has been on carbon dioxide (due to its impact on global warming) as well as other pollutants. Concerns exist regarding the economic viability of these technologies and the timeframe of delivery, potentially high hidden economic costs in terms of social and environmental damage, and the costs and viability of disposing of removed carbon and other toxic matter. More, the byproducts of coal power production range from fly ash sludge ponds full of mercury, arsenic, and sulfur in unlined ponds that can leak into the water supply.

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).

Coal ash is a byproduct of burning coal in power plants and is composed mainly of aluminum and silicon oxides. This ash is commonly stored away in dump sites, only to leach out solutions of concentrated toxic heavy metals. Such issues are detrimental to the health of water systems, posing both a human and environmental health risk. However, there are solutions to this problem. Coal ash possesses unique chemical properties that allow for the remediation of other environmental concerns, such as the treatment of soil polluted with heavy metals, the removal of nutrients from wastewater, and the remediation of acid mine drainage in streams.

I would have to say that from the reading that it can be very harmful for the coal mining chemicals to seep into the ground into our drinking water.

Morocco is rich in mineral deposits and the third largest phosphate rock producers. Morocco has vast reserves of phosphate rocks, copper, cobalt, anthracite coal, silver, gold, iron ore, zinc, manganese etc. The quality of water in the areas surrounding mining sites is compromised during and after the mining with harmful agents such as Arsenic (As), Lead (Pb), Zinc(Zn) etc.Due to this water pollution and the fact that water resources are limited, a large number of people and livestock in villages close to the mining sites are affected with serious life threatening diseases. In such areas thirty percent of the wastewater that is untreated is discharged directly into natural water bodies. As an example, the Sebou basin that constitutes

The main pollutant of surface water in the mid-Atlantic region is Acid Mine Drainage, AMD, also called Abandoned Mine Drainage. AMD is a nonpoint source pollution that has degraded more than 4,500 stream miles, in just the mid-Atlantic region, due to the drainage of metal-rich water from mining activities (Jacobs). The runoff is extremely acidic due to the exposure of pyrite containing rocks, a sulfur bearing mineral (FeS2), during mining activities, and the chemical reactions associated with the contact of air and water with such rocks. As a result of such chemical reactions, sulfuric acid (H2SO4) is produced. Several chemical reactions take place and are as follows:

I learned that mines were abandoned and in this case we have the responsible helping out. In other cases like the Gold King Mine in Colorado that it was used in the early 1900’s, the responsible that abandoned the mines were from Canada and are no were to be found. The problem with these mines is that when they extract all the uranium and there is no need for the mines, these mines need to be abandoned and closed. Unfortunately, there was no cleanup process when the mines were abandoned. Leaving the areas contaminated and the water from the rain transporting the contamination to other areas. 100 years ago, there was no standard on how to properly abandon a mine. Now days, the EPA and the state environmental departments are responsible to enforce the proper abandonment procedures and make sure the closure will not contaminate nearby areas or the water used for drinking, crops, and other human and animal uses. The runoff of the mine contamination can increase the total dissolve solids (TDS) in the nearby waters, making it non usable for human consumption and fish

Another form of industrial waste that contributes to water pollution is acid rain. Acid rain is a product of industries burning coal. The burning of coal produces sulfur oxide and nitrogen oxide, and when these chemicals combine with the earth’s atmosphere it forms acid rain The Northeastern part of the United States has the worst acid rain levels in the world. More specific, the states with the highest concentration are Ohio, Indiana, Illinois, and some boarding parts of Canada and New England area. The falling acid rain can destroy plants and animals in several different ways. The acidification of a lake, river, or stream because of the high acidic levels in the water kills algae. Since algae are the main source of food, for many species of fish, they will also suffer from the high acid levels.

The problem of AMD is serious at many sites and can happen after mine closure. Quantities and concentrations of AMD depend on site-specific characteristics. Chemical, biological, and physical factors are important for the rate of AMD generation. These factors can be characterized by dumps with high permeability and high oxygen ingress that contribute to higher ARD reaction rates. The dumps that increase sediment loads can cause loss of habitat in the surrounding area. Thus, this leads to higher temperatures and increased oxygen ingress through convection. These factors can also be characterized by low pH values (altered chemical equilibria) and elevated content of heavy metals (toxicity to aquatic organisms and human users) and dissolved salts (salinization problems for agriculture and sensitive users). For countries in more humid areas, high levels of precipitation can aggravate the problem of AMD [2]. Also, bacteria that can accelerate AMD generation due to their ability to oxidize sulphur minerals and increase the rate of sulphur oxidation, which is an important factor in ARD formation [3]. All of these discussed factors can accelerate the production of AMD to a level that can be problematic.

Acid mine drainage is most common with hardrock mines where metal ore is bound together with sulfur. The increased acidity created from acid mine drainage has a series of negative effects, depending on the severity of change in the pH level. The acid mine drainage creates inhospitable environments to aquatic life in river systems and former mine sites, with the exception of "extremophile" bacteria (Coil, D., McKittrick, E., and Higman, B., 2010). Acid mine drainage can severely degrade the quality of the water, especially if it's a essential water supply.

Phytoremediation is the process by which plants and trees are used to remove or stabilize hazardous pollutants that exist in soil, sediments, surface water or groundwater. The EPA (environmental protection agency) estimates that more than 30,000 sites in the U.S. are in need of environmental treatment, and a great number of these sites are contaminated with highly toxic metals. Abandoned or under-used commercial and industrial facilities, termed as “brownfields,” are a major contributor to this environment concern. “Brownfields” pose significant health risks to nearby residential populations and threaten the plant and animal life close to them. Phytoremediation provides a very