Biodegradation rates can be expressed in several ways. With good approximation, microbiological biodegradation can be expressed as a Monod equation:
where c is the concentration of the considered compound, Y is the yield of biomass B per unit of c, B is the biomass concentration, gmax is the maximum specific growth rate and km is the half-saturation constant. I c << km the expression is reduced to a first order reaction scheme: dc/dt = —K'Bc. K = gmax/kmY. In water, B is highly dependent on the concentration of suspended matter and in soil B is dependent on the porosity of the soil. B may therefore often be considered a constant. It implies that dc/dt = k c. k has the unit 1/h, 1/24 h, 1/w, or 1/y. If the biological half-life is applied, we get the following: ln 2 = 0.7 = kt1/2 , where t1/2 is the half-life.
Was this article helpful?
You Might Start Missing Your Termites After Kickin'em Out. After All, They Have Been Your Roommates For Quite A While. Enraged With How The Termites Have Eaten Up Your Antique Furniture? Can't Wait To Have Them Exterminated Completely From The Face Of The Earth? Fret Not. We Will Tell You How To Get Rid Of Them From Your House At Least. If Not From The Face The Earth.