It can pose a threat to human health and environment due to its hazardous effect.Heavy metals existence in water can damage many of human part even in low concentration. Therefore removing heavy metals in water are very important.The United States Environmental Protection Agency (USEPA) has set up the maximum contamination levels (MCLs) of heavy metals for surface or groundw... ... middle of paper ... ...ructural polysaccharides,amido, amino, sulphydryl carboxyl groups, alcohols and ester.These functional groups substitute hydrogen ions for metal ionsin solution or donation of an electron pair to form complexes with the metal ions in solutions. Due to abundant binding groups, AWBs could be an enormous potential source of adsorbent materials for decontaminating heavy metals from wastewater (T.A.H. Nguyen a, et al,2013). The hydroxyl and carboxyl groups present in these biopolymers are the responsible of Cr(VI) reduction and subsequent Cr(III) adsorption (Marta López-García a, 2013) (Lin andWang, 2012; Wang and Lee, 2011).
This disrupts the balance of the ecosystem of the water causing the quality of the water to dissipate making it not safe to drink or use for other proposes. Another way harnessing energy is disrupting the balance of our water resources is mining fossil fuels. When we mine, for coal body’s of water can get access to the mines which results in the contamination of the water with heavy metal this is shown on the webs site www.ucsusa.org stating “Surface mining can also directly impact the health and safety of surrounding communities. Mudslides, landslides, and flashfloods may become more common. And depending on the
Some of the chemicals in the fracking fluid and wastewater have been identified as carcinogens. Many of the other chemicals have been found to be harmful to humans (Environmental). According to Griswold, author of the article “The Fracturing of Pennsylvania,” wastewater is a combination of different chemicals that come from the process of fracking. Not only does this wastewater contain chemicals that were originally used in the drilling, but it also contains harmful substances that come from the earth like salts and other compounds (Griswold). Hundreds of chemicals are used during Marcellus Shale drilling; therefore, the process can cause contamination and pollution.
Title : Phytoremediation of Heavy Metals laden Waste Water using Duckweed species INTRODUCTION Presservation of the environment quality is one of the major concern of this century. Our biosphere is getting degraded by the release of natural and synthetic substances that can cause deleterious effects on living organisms. Among all the pollutants , heavy metals are easily transported and accumuted in the environment. Many industries like textile and steel, electroplating, metal producing release heavy metal such as cadmium, copper, chromium, nickel and lead in the wastewater (Demirenzen et al., 2007). Most of the heavy metals are toxic or carcinogenic in nature and pose a threat to human health and the environment (Shakibaie et al., 2008; Vinodhini and Narayanan, 2009).
Introduction Cadmium (Cd) toxicity is one of the most harmful heavy metal contaminations which could severely affect the environment in a number of ways and in turn affect the living population within that environment. This however can be due to a variety of issues such as environmental disruption or human activity. Cadmium is classed as a Class D heavy metal, meaning, “It does not have a known biological function and can be toxic even when in low amounts”. This very toxic water-soluble heavy metal is a by-product during mining, extraction or removing impurities from ores with Copper, Lead and Zinc. One of the well-known disasters in history is Thailand’s cadmium contamination due to zinc mining by humans.
Pollution of the aquatic environment is a global concern due to devastating effects of contaminants (heavy metals, polybrominated diphenyl ethers, polychlorinated biphenyls, polycyclic aromatic hydrocarbons, endocrine disruptors, pharmaceuticals, pesticides, insecticides, etc.) whose levels are growing at an alarming rate. Ecosystems are under the pressure of complex mixtures of contaminants whose effects are not always simple to assess (Picado et al., 2007). Heavy metals are considered to be one of the most widespread groups of micro contaminants because of their persistent nature and slow elimination from environmental compartments (Fargasova, 1998). Majority of the heavy metals occur naturally in the environment and are released as a result of human activities and natural processes.
Sulfur Dioxide (SO2) is released by fossil fuels when they undergo combustion. Power plants and other fossil fuel burning industrial areas release various forms of nitrous oxides (Nox). These two chemical compounds combine with the water in the atmosphere to form what is known as acid rain. The main reason that has prompted legislation of industrial emissions from governments is because of the negative effects they can have on the environment. Acid rain is harmful to the environment because of it's low pH.
CONCLUSION Hydraulic fracturing has many impacts on the freshwater sources used as drinking water supplies by humans. These effects include chemical contamination with chemicals such as benzene (a carcinogen). Due to his, fracking can be considered a leading cause of human fatalities, especially in urban areas with close proximity to drilling sites. As many of the impacts fracking has are negative, it can be concluded that fracking is not a sustainable practice in the long term, especially since gas reserves will eventually be exhausted and only the pollution created will remain.
An increase in industrial, agricultural practices and several anthropogenic activities adds a significant amount of heavy metals in soil and water. Presence of these metals beyond the threshold limit is toxic for the flora and fauna of the surroundings. So, there is a need for removing the harmful heavy metals from the environment. Conventional methods such as precipitation, evaporation, electroplating, ion exchange, membrane processes, etc. have been ineffective because of technical and economic issues.
Also, the result of this is rich plant life which prohibits recreational activities. Plankton blooms depress oxygen levels (as mentioned before) and therefore, endanger living organisms. Major sources of nutrients are municipal sewage and agricultural runoff. Toxic Materials: Can affect the health of aquatic organisms and their consumers, and the people who drink the contaminated water. The toxicants include lead, mercury, DDT, PCB, benzopyrene, oil, and dibutyl phthalate.