phytoremediation of contaminated soil and water pdf

Phytoremediation Of Contaminated Soil And Water Pdf

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Phytoremediation: A Promising Approach for Revegetation of Heavy Metal-Polluted Land

Phytoremediation technologies use living plants to clean up soil, air, and water contaminated with hazardous contaminants. Although attractive for its cost, phytoremediation has not been demonstrated to redress any significant environmental challenge to the extent that contaminated space has been reclaimed. Phytoremediation is proposed as a cost-effective plant-based approach of environmental remediation that takes advantage of the ability of plants to concentrate elements and compounds from the environment and to detoxify various compounds. The concentrating effect results from the ability of certain plants called hyperaccumulators to bioaccumulate chemicals. The remediation effect is quite different.

There are several different types of phytoremediation mechanisms. These are:. Rhizosphere biodegradation. In this process, the plant releases natural substances through its roots, supplying nutrients to microorganisms in the soil. The microorganisms enhance biological degradation. In this process, chemical compounds produced by the plant immobilize contaminants, rather than degrade them.

Phytoremediation Applications for Removing Heavy Metal Contamination from Soil and Water

The potential of Arundo donax L. The growth and physiology of plants were evaluated at the end of the experiment. Relatively low Cd uptake occurred during soil experiment with low translocation factor TF values. Consequent to global industrialization, heavy metal pollution is a widespread problem which has become a major environmental concern due to hazardous effects on human and environmental health. In industrialized societies, heavy metals are the world over environmental contaminants. Air or water pollution by metals varies from soil pollution, because heavy metals persevere in soil for a longer time period as compared with the other compartment of the biosphere [ 1 ]. Cadmium Cd , a highly toxic metal pollutant of soils, inhibits root and shoot growth and yield production, affects nutrient uptake and homeostasis, is frequently accumulated by agriculturally important crops, and then enters the food chain with a significant potential to impair animal and human health [ 3 ].

Heavy metal accumulation in soil has been rapidly increased due to various natural processes and anthropogenic industrial activities. As heavy metals are non-biodegradable, they persist in the environment, have potential to enter the food chain through crop plants, and eventually may accumulate in the human body through biomagnification. Owing to their toxic nature, heavy metal contamination has posed a serious threat to human health and the ecosystem. Therefore, remediation of land contamination is of paramount importance. Phytoremediation is an eco-friendly approach that could be a successful mitigation measure to revegetate heavy metal-polluted soil in a cost-effective way.

colonisers, growing in small isolated tufts (De Koe ). Consequently, erosion of the spoil heaps by wind and water. resulted in a permanent pollution of.


Biotechnology in the Sustainable Environment pp Cite as. Over the past several years, scientists have discovered many examples of living plants that can remove heavy metals and other pollutants from soil and water. This potential approach to cleaning the environment, termed phytoremediation, draws on our centuries of experience in cultivating crops and is emerging as a low cost treatment technology. The idea that plants can be used for environmental remediation is not new.

Nuclear power reactors are operating in 31 countries around the world. Along with reactor operations, activities like mining, fuel fabrication, fuel reprocessing and military operations are the major contributors to the nuclear waste. Commonly high concentrations of cesium Cs and strontium 90 Sr are found in a nuclear waste.

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Soil contamination has led to serious land tenure problems, reduction in land usability for agricultural production; as a consequence, food insecurity is nowadays a global challenge. Indeed, with rapid population growth across the world, the food demand for consumption has drastically increased and traditional ways of producing food cannot meet with the actual demand. Industrialization has been acknowledged as a way out to sustain humanity with food. Unfortunately, the later has further turn into a threat to the environment. In effect, several potentially toxic elements PTE are being released in the environment and soil systems; and arable or agricultural lands are getting restraint, limited and scarce.


Он подбежал к крепко сбитому охраннику. - Мне срочно нужно такси.

ОБЪЕКТ: ДЭВИД БЕККЕР - ЛИКВИДИРОВАН Коммандер опустил голову. Его мечте не суждено сбыться. ГЛАВА 104 Сьюзан вышла из комнаты. ОБЪЕКТ: ДЭВИД БЕККЕР - ЛИКВИДИРОВАН Как во сне она направилась к главному выходу из шифровалки. Голос Грега Хейла эхом отдавался в ее сознании: Сьюзан, Стратмор меня убьет, коммандер влюблен в .

 Ее зовут… Не отключайся, дружище… - Роса… - Глаза Клушара снова закрылись. Приближающаяся медсестра прямо-таки кипела от возмущения. - Роса? - Беккер сжал руку Клушара. Старик застонал. - Он называл ее… - Речь его стала невнятной и едва слышной.

 - У него был врожденный порок сердца. - Никогда об этом не слышала. - Так записано в его медицинской карточке. Он не очень-то об этом распространялся. Сьюзан трудно было поверить в такое удачное совпадение.


И я уверена, что большинство наших граждан готовы поступиться некоторыми правами, но знать, что негодяи не разгуливают на свободе. Хейл промолчал. - Рано или поздно, - продолжала она, - народ должен вверить кому-то свою судьбу. В нашей стране происходит много хорошего, но немало и плохого. Кто-то должен иметь возможность оценивать и отделять одно от другого.

 Но глаза… твои глаза, - сказал Беккер, чувствуя себя круглым дураком.  - Почему они такие красные. Она расхохоталась. - Я же сказала вам, что ревела навзрыд, опоздав на самолет.

 Но, директор, - возразила Сьюзан, - это не имеет смысла. Если Танкадо не понял, что стал жертвой убийства, зачем ему было отдавать ключ. - Согласен, - сказал Джабба.  - Этот парень был диссидентом, но диссидентом, сохранившим совесть.

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 - Мне не помешала бы еще одна подушка, если вас это не затруднит. - Нисколько.  - Беккер взял подушку с соседней койки и помог Клушару устроиться поудобнее.


Olivier R.

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