Design and experimental study of immobilized soil bioreactor for in‐well biodegradation of pentach rophenol in groundwater

Abstract

A novel system for in-situ biological treatment of pentachlorophenol in groundwater is proposed in this work. It is based on the concept of soil immobilization, which has already been shown to be very efficient when applied to bioreactor engineering. For this paper, we used immobilized soil to develop a bioreactor system for an in-situ (in-well) biodegradation of pentachlorophenol (PCP). The process was camed out at 9"C, a temperature typical for groundwater. The volumetric PCP degradation efficiency in the new system was very high -up to 400 mg/(L.h). The effect of some physicochemical parameters (temperature, substrate concentration) on the biodegradation kinetics was studied. The results obtained show that the application of soil immobilization to the in-situ biodegradation of groundwater contaminated with PCP is very promising.On propose dans ce travail un nouveau systeme pour le traitement biologique in situ du pentachlorophenol dans I'eau souterraine. Celui-ci s'appuie sur le concept de I'immobilisation du sol, dont on a deja montre l'efficacite lorsqu'il est applique au genie des bioreacteurs. Dans cet article, on utilise du sol immobilise pour mettre au point un systeme de bioreacteur pour une biodegradation in situ (dans le puits) du pentachlorophenol (PCP). Le procede a ete realise a 9"C, une temperature typique de I'eau souterraine. L'efficacite volumetrique de degradation du PCP de ce nouveau systeme est tres elevee -jusqu'a 400 mg/(L.h). On a etudie I'effet de certains parametres physicochimiques (temperature, concentration de substrat) sur la cinetique de biodegradation. Les resultats obtenus montrent que l'application de I'immobilisation du sol a la biodegradation in situ de I'eau souterraine contaminee au PCP est tres prometteuse.

On‐line estimation of dissolved methane concentration during methanotrophic fermentations

“…One such reactor is the immobilized soil bioreactor (ISBR) which was originally developed as a membrane bioreactor with a self-contained inoculum (soil) for the mineralization of recalcitrant groundwater contaminants such as pentachlorophenol (Karamanev and Samson, 1998;Karamanev et al, 1999). Its application was then expanded to operation as a methanotrophic bioreactor, for the bioremediation of contaminated groundwater (Ramsay et al, 2001).…”

A net draft tube slurry airlift bioreactor for 2,4‐D (2,4‐dichlorophenoxyacetic acid) pesticide biodegradation

“…The activated sludge‐net structure is very similar to the structure of immobilised chemical catalyst, enzymes, or microbial cells. Karamanev et al (1999) applied the same technique for treating contaminated soil which repeatedly passed through a porous membrane with a large pore size distribution (1–1000 µm). In their study the net allows the liquid to pass through while preventing the passage of gas bubbles.…”