Biodegradation of Pyridine Derivatives in Soil Suspensions

Abstract

Relationships between structure and biodegradability were evaluated for 28 pyridine derivatives in nutrient solutions inoculated with soil and incubated at 24°C. Compounds studied included pyridine; mono-and disubstituted pyridinecarboxylic acids; and hydroxy-, chloro-, aminoand methylpyridines. Disappearance of the pyridine added was measured by UV spectrophotometry, and the ammonium released by cleavage of the pyridine ring was measured by colorimetry. Volatilization was estimated by analysis of the pyridines collected on the polyurethane foam stoppers used to plug the incubation vessels; sorption by soil was estimated from the initial decrease in solution concentration upon addition of soil. Pyridinecarboxylic acids, monohydroxypyridines and the unsubstituted pyridine ring did not volatilize and were degraded within 7 to 24 d. Methylpyridines were intermediate in degradability, disappearing in from less than 7 to more than 30 d. None of the aminopyridines was completely degraded in 30 d. Of the chloropyridines tested, only 4chloropyridine was completely degraded in 24 d. The susceptibility of 4-chloropyridine to degradation may be attributed to the ease with which a chlorine group is removed from position 4 on the pyridine ring. No degradation was detected in 30 d for any of the other chloropyridines. Chloroand methylpyridines volatilized extensively.

Microbial degradation of pyridine and α-picoline using a strain of the genera Pseudomonas and Nocardia sp.

“…strain OS4 isolated from the oxic zone of a spent shale column degrading pyridine. Sims and Sommers [33] observed a temperature of 24°C to be optimal for Micrococcus luteus isolated from soil for biodegradation of pyridine. Thus, the biodegradation of pyridine and its derivatives is significantly affected by temperature and temperature optima vary from microorganism to microorganism.…”

“…During biodegradation of pyridine, the N-atom in the pyridine ring is released as NH 3 upon mineralization [33]. The ammoniacal nitrogen (NH 3 -N) is often monitored as a measure of pyridine biodegradation [39].…”

Kinetic and thermodynamic of adsorption of 2-picoline by sawdust from aqueous solution

“…discharge 2-pic-bearing wastewaters [2]. Various physical-chemical and biological treatment techniques are suggested for the treatment of 2-pic-bearing wastewaters, which include concentration followed by biodegradation [3] and adsorption [4][5][6]. Adsorption can be a preferred treatment technique, provided that the adsorption process is cost-effective.…”

Adsorption of α-picoline onto rice husk ash and granular activated carbon from aqueous solution: Equilibrium and thermodynamic study

“…: +91 1332 285715; fax: +91 1332 273560. Various physico-chemical and biological treatment techniques are suggested for the treatment of Pi-bearing wastewaters, which include concentration followed by incineration [4], adsorption [5], biodegradation [6], etc. Adsorption can be used, provided that the adsorbents are cheap, easily available, and, if possible, regenerable, and that they have large surface area and high sorption capacity for Pi.…”