Introduction to Biotechnology - Environmental Biotechnology: Theory and Application - page 4

employ them where possible. Changes in legislation throughout Europe, the US
and elsewhere, have combined to drive these issues higher up the political agenda
and biological methods of waste treatment have gained far greater acceptance as a
result. For those industries with particularly high biowaste production, the various
available treatment biotechnologies can offer considerable savings.
Manufacturing industries can benefit from the applications of whole organ-
isms or isolated biocomponents. Compared with conventional chemical processes,
microbes and enzymes typically function at lower temperatures and pressures.
The lower energy demands this makes leads to reduced costs, but also has clear
benefits in terms of both the environment and workplace safety. Additionally,
biotechnology can be of further commercial significance by converting low-cost
organic feedstocks into high value products or, since enzymatic reactions are
more highly specific than their chemical counterparts, by deriving final substances
of high relative purity. Almost inevitably, manufacturing companies produce
wastewaters or effluents, many of which contain biodegradable contaminants, in
varying degrees. Though traditional permitted discharges to sewer or watercourses
may be adequate for some, other industries, particularly those with recalcitrant or
highly concentrated effluents, have found significant benefits to be gained from
using biological treatment methods themselves on site. Though careful moni-
toring and process control are essential, biotechnology stands as a particularly
cost-effective means of reducing the pollution potential of wastewater, leading to
enhanced public relations, compliance with environmental legislation and quan-
tifiable cost-savings to the business.
Those involved in processing organic matter, for example, or with drying,
printing, painting or coating processes, may give rise to the release of volatile
organic compounds (VOCs) or odours, both of which represent environmental
nuisances, though the former is more damaging than the latter. For many, it is
not possible to avoid producing these emissions altogether, which leaves treating
them to remove the offending contaminants the only practical solution. Especially
for relatively low concentrations of readily water-soluble VOCs or odorous chem-
icals, biological technologies can offer an economic and effective alternative to
conventional methods.
The use of biological cleaning agents is another area of potential benefit,
especially where there is a need to remove oils and fats from process equipment,
work surfaces or drains. Aside from typically reducing energy costs, this may
also obviate the need for toxic or dangerous chemical agents. The pharmaceutical
and brewing industries, for example, both have a long history of employing
enzyme-based cleaners to remove organic residues from their process equipment.
In addition, the development of effective biosensors, powerful tools which rely
on biochemical reactions to detect specific substances, has brought benefits to a
wide range of sectors, including the manufacturing, engineering, chemical, water,
food and beverage industries. With their ability to detect even small amounts
of their particular target chemicals, quickly, easily and accurately, they have