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ISBN-10: 0309034906

ISBN-13: 9780309034906

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Activated sludge treatment remains a workhorse technology for controlling pollution of aquatic environment. Similarly, aerobic stabilization of solid organic waste through composting has a long history of use. Both these technologies have undergone considerable improvement [3]. The application of microbial metabolic potential (bioremediation) is accepted as an environmentally benign and economical measure for decontamination of polluted environments. Bioremediation methods are generally categorized into ex situ and in situ bioremediation.

Juncea to be especially adapted in accumulating lead. 5% dry weight in the shoots suggesting that a crop of such plants could extract 630 k g / h a of Pb in above ground biomass with a single harvest, more if some root material was harvested as well [40]. It is important to note however, that these experiments were done hydroponically. In soil, the property of Pb to bind to clay soil particles and organic matter, and its inclusion in insoluble precipitates significantly reduces the bioavailability of Pb to the plant [40].

In the lag phase there is a delay in the microbial population growth until the microbes have become acclimatized to the substrate(s) [100], which in many instances are the contaminants/pollutants under remediation, and surrounding conditions. The microbes cannot consume the food source until they have developed the required enzymes and metabolites necessary to 28 BlOREMEDIATION AND SUSTAINABILITY break down the contaminant [22]. After the necessary enzymes and metabolites have been produced, the microbes enter the exponential phase of growth [101].

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Ocean Disposal Systems for Sewage Sludge and Effluent

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