Costs biological methods

Various physical, chemical, and biological methods have been used for the treatment of dye-containing wastewater. However, these conventional technologies have disadvantages like poor removal efficiency and high running cost. Therefore, low-cost sorbents which can bind dye molecules and be easily regenerated have been extensively searched and tested [3-7]. 

The effectiveness of a combined reduction-biological treatment system for the decolorization of nonbiodegradable textile dyeing wastewater has been investigated. The bench-scale experimental comparison of this technique with other reported combined chemical-biological methods showed higher efficiency and lower cost for the new technique [35]. 

The compatibility of the chromatographic system with aqueous biological fluids (urine, serum), and the direct analysis of highly polar compounds with no need for hydrolysis and derivatization allow to reduce sample manipulation and the probability of artifact formation/analyte degrada-tion/contamination. In addition, the possibility of carrying out separate LC and MS experiments accounts for rapid and cost-effective method development. These features are highly considered in the forensic field where often the analyst is requested to deal with the setup of a method for an unusual analyte or substrate. 

Biological Methods Enzymatic digestion of the cell wall is a good example of biological cell disruption. It is an effective method that is also very selective and gentle, but its high cost makes it impractical to be used for large-scale operations. 

As noted in a review, no economical chemical process has emerged for the asymmetric synthesis of amino acids.3 This presumably refers to large-scale production where the research costs associated with the development of a biological approach can be justified. Chemical methods can produce racemic substrates, as illustrated later in this chapter with L-methionine and D-phenylglycine. With methods in place, however, biological methods can be implemented rapidly.4... 

The reasons why natural products have not been an area of focus for pesticide company discovery efforts are several. They include the relatively high cost of bioassay-directed isolation, the probability of rediscovery, and the often prohibitively complex structure of the active molecule. Furthermore, the strategies for discovery of natural product-based pesticide discovery are different from those for synthetic compounds, requiring a somewhat different laboratory infrastructure. New methods, including semi-automated bioassays, automated chemical extraction and analysis, and molecular biology methods to... 

Biological control is never complete. The degree of control fluctuates. There is always a time lag between pest population increase and the corresponding increase in natural controls. But, under proper conditions, sufficient control can be achieved to eliminate the threat to the crop or animal needing protection. Biological control can be a low-cost control method particularly suited to low-value crops (pastureland, clover, and hay crops) or in areas where some injury can be tolerated (golf course fairways or forest areas). 

In selecting a particular physical, chemical, and biological method of treatment, the economic feasibility of the method is an important factor as well. The cost of treatment procedure and the amount of the waste to be treated is also a strong factor. Moreover, the on-site and off-site treatments should also be considered in determining the cost of the... 

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