Bioremediation and Deodorization

Bioremediation

Bioremediation is the use of biological system for the reduction of pollution from air or from aquatic system. Microorganism and plants are the biological systems which are generally used. Bio-degradation with microorganism with is the most frequently occurring bioremediation option. Microorganosm can break down most compounds for their growth and energy need. Bioremediation is the microbial clean up approach. It employs biological agents to render hazardous waste to non-hazardous or less hazardous waste. Microbs can acclimatize themselves to toxic wastes and new resistant strains develop naturally. Such strains can be used for pollution control and environmental protection.
Examples
• Some of algae and bacteria can accumulate large quanties of metals. Such as pseudomonous aerugensa can accumulate Uranium and thiobacillus can accumulate silver.
• Mixture of microbes and enzymes are used to clean up chemical wastes such as detergent, pesticides, etc.

Biological deodorization

Deodorization process include physical, chemical and biological. In biological deodorization, fuel smelling compounds are decomposed by exploiting metabolic process of the microorganisms. An exhaust gas treatment system for H2S and SO2 based on Thiobacillus ferroxidan bacteria is already practice in Japan.

Bioscubbing involves scrubbing of waste effluents using microbial methods to detoxify or de-odourise certain constituents in the waste effluents. Hypomcrobium SSP can be used to oxidize the malodourous dimethylsulphide aerobically or anaerobically.


Aerobic process H2S + 2O2 H2SO4

(CH3)2S + SO2 H2SO4 + 2CO2 + 2H2O

Anaerobic process

Hypomicrobium
5H2S + 8 NaNO2 H2SO4 + 4NaSO4 + 4N2 + 4H2O
SSP

(CH3)2S + 4NaNO2 NaSO4 + 2 CO2 + 2N2 + 2NaOH + 2H2O