Environmental Biotechnology

Anjala DurgapalLecturer

Department of BotanyM. B. Govt. P. G. College,

Haldwani (Nainital) Uttrakhand

IntroductionBiotechnology is “the integration of natural sciences and engineering in order to achieve the application of organisms, cells parts thereof and molecular analogues for products and services” (EFB, 1989).

Environmental Biotechnology is the application of these processes for the protection and restoration of the quality of our environment.

• Bioremediation is the use of biological systems for the reduction of pollution from air, aquatic or terrestrial systems.

• The process involves aerobic or anaerobic microorganisms that results in degraded products.

• Bioremediation is used to reduce or remove hazardous waste which has already polluted the environment.

PollutionPollution(Air water or soil)(Air water or soil)

Microorganisms

Degraded product

Eco-friendly(detoxification)

Hazardous

Bioremediation

Tri or tera-chloro-ethylene

Complete Incomplete

Vinyl-chloride

Applications of Bioremediation

1.Waste water and Industrial effluents

2.Drinking and process water

3.Soil and land treatment

4.Solid waste

Waste water and Industrial Effluents

• Removal of common pollutants from water before discharged into river or sea.

• Elimination of phosphorus nitrogen, heavy metals and chlorinated compounds.

• Sulfur reducing bacteria can be used to remove wastes containing sulfur.

Bed containing waste material and microbes in

suspension

Bioreactor

Drinking and Process water• Biotechnology for the reclamation and

purification of waste water for re-use

• Agricultural regions of the world, animal wastes and excess fertilizers result in high level of nitrates in drinking water.

• Biotechnology has provided successful methods by which these compounds can be removed from processed water before it is delivered to customers.

Air and GasesAir and Gases

Bio-scrubber(Cell suspension)

Bio-trickling filter(Microorganisms immobilized

on an inert matrix)

Pollutants

NitrogenSO22

Flue gas (blast furnace)Styrene (waste gas of polystyrene (Bio-filter: Fungi)

Purified gases

Soil and land treatmentSoil and land treatmentIn-situ:Bio-augmentation [Introduction of micro-organisms]Bio-stimulation [Ventilation and /or adding nutrient solutions]

Ex-situ:Removal of soil and ground water and treating it above the ground

Phyto-remediation Phyto-remediation employs use of plants and bacteriaMetals from contaminated soils and ground water. For e.g.. Rhizobacteria

Bio-remediation of land [bio-restoration] is cheaper than physical methods with harmless end products.

Solid waste

• Composed of readily biodegradable organics• Bio-wastes can be converted to a valuable resource by composting or anaerobic digestion

• Anerobic digesters permit the recovery of substantial amounts of high value bio-gas together with a high quality stable organic residue

• The organic residue can be used as manure.• Recycling of solid waste can save enormous cost of incineration

PreventionInvolves development of processes with reduced environmental impacts

Biotechnological ways of prevention are-Process improvement: Use of enzymes

Product innovation: Development of new products that have less impact on environment their predecessors for e.g. genetically improved plant varieties that resistant against insects/ diseases, thereby reducing the use of pesticides.

Detection and Monitoring

Established measures include:Established measures include:

•Counting the number of plants, animals and microbial Counting the number of plants, animals and microbial species. species.

•Biological detection methodsBiological detection methods•Biosensors and immunoassaysBiosensors and immunoassays•Detection and monitoring of microorganisms used for Detection and monitoring of microorganisms used for bioremediation. bioremediation.

•Detection and monitoring of ecological effectsDetection and monitoring of ecological effects

Employs a range of biological methods to detect Employs a range of biological methods to detect incidents of pollution and continuous monitoring incidents of pollution and continuous monitoring of pollutants.of pollutants.

Genetic EngineeringGenetic Engineering

Involves the use of microorganisms genetically modified by recombinant DNA technology.

GE is a powerful tool in creating environment friendly alternatives for products and processes

For e.g. :•Production of enzymes•Amylose free potato•Indigo producing bacterium

Conclusion• Concerns for new technologies released into

the environment do exist.

• New techniques under consideration make use of genetically engineered microorganisms designed to deal with specific tasks.

• There is a tremendous potential for biotechnology to contribute in the remediation and protection of the environment.