PAH biodegradation in surfactant‐water systems based on the theory of cohesive energy density (CED)

Abstract

The influence of two non-ionic surfactant additives (Triton X-100 and Brij 35) on polycyclic aromatic hydrocarbon (PAH) biodegradation was evaluated using the chemical molecular interaction method, which is based on the theory Of cohesive energy density (CED). The results indicated that PAHs have relatively higher CED values because aromatic compounds with labile pi are more polarized and this encourages molecular attractions involving induced dipole force. Under different PAH-surfactant compositions, similar CED values, which facilitated their intermolecular attractions through pi-pi electron interactions, gave rise to a similar biodegradation pattern. For example, when induced enzymes were able to target the same molecular bonding on the PAH and Triton X-100, rapid degradation rates were observed in both systems. The distribution of the PAH in the monomer or micelle surfactant bulk affected the rate of PAH biodegradation. Quantification of the bacterial activity by applying specific oxygen uptake requirements (SOUR) identified an effect involving chemical molecular interaction. Changes in the physiological characteristics as measured by BioLog GN microplate measurements were identifiable and also could be related to the chemical structure of the dual substrates. Community-level physiological profiling (CLPP) changed when PAH biodegradation took place in the presence of the different surfactants. Cluster analysis using matching coefficient and carbon degradation potential values also varied with the different PAH-surfactant compositions. (c) 2007 Society of Chemical Industry

Advances in the field of high‐molecular‐weight polycyclic aromatic hydrocarbon biodegradation by bacteria

“…, 2000; Dries and Smets, 2002; Sartoros et al. , 2005; Chang et al. , 2007) and from marine and brackish saline environments (Yamada et al.…”

The influence of sorption on polyaromatic hydrocarbon biodegradation in the presence of modified nonionic surfactant organoclays

“…In all cases, the system during biodegradation was sampled regularly during experimental analysis as has been described in a number of our previous studies (Chang et al, 2007a(Chang et al, ,b, 2010(Chang et al, , 2014; the methods used to assess the systems included PAH analysis, bacterial community analysis and physiological profiling.…”

“…Possible mechanisms that influence these effects include physical sorption and chemical interactions, both of which seem to play important roles in PAH biodegradation when different complexes of soil and PAHenonionic surfactant are present. For example, the cohesive energy density of the PAHenonionic surfactant complex has been shown to be able to alter the PAH biodegradation rate in aqueous solution (Chang et al, 2007a). More aggressive approaches to the remediation process are needed and more attention needs to be paid to the development of PAHcontaminated soil remediation systems.…”

Effects of polyethoxylate lauryl ether (Brij 35) addition on phenanthrene biodegradation in a soil/water system

“…CLPP has been reported to be a suitable approach to monitoring the phenotypic fingerprints of free-living and attached bacterial communities during PAH biodegradation. [38] Figure 4 shows the CLPP profile for PHE biodegradation in the presence of Brij 35. In this context it should be noted that there are vast variations in soil/water systems due to differences in SOM content.…”