Biodegradation of malathion and evaluation of kinetic parameters using three bacterial species

Efficacy of three different bacterial species for biodegradation of malathion and its secondary products have been investigated. The concentration range of malathion under investigation was 25-200 mg·L−1. It has been observed that Pseudomonas putida was found to be most efficient for degradation of malathion. The removal of malathion was 72% at its concentration of 125 mg·L−1. The optimum parameters were studied for all three bacterial species in batch mode. The average values of Ks and μmax were obtained for all these species for degradation of malathion. Results indicate that P. putida has high degradation potential than Rhodoccocus rhodochrous and Sphingomonas sp. The degradation of P. putida was maximum at concentration of 125 mg·L−1, pH and temperature at 7 ± 0.2, 80 °C respectively. Metabolites were obtained using GCMS analysis. © 2016 Tomsk Polytechnic University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license

Removal of aqueous benzene in the immobilized batch and continuous packed bed bioreactor by isolated Bacillus sp. M1

Benzene biodegradation was studied in batch and continuous packed bed bioreactors using polyurethane foam (PUF) as packing media by isolated Bacillus sp. M1. The values of optimized process parameters were found to be 800 × 106CFU·mL−1, 400 mg·L−1, 7.0 and 37 °C for inoculum size, substrate concentration, pH and temperature respectively. Continuous packed bed bioreactor (CPBBR) was operated and monitored for 69 days on laboratory scale at various flow rates (10-60 mL·h−1). The steady state removal efficiency was observed more than 90% up to the inlet load of 288 mg·L−1.d−1 and elimination capacity was found to be 91.2-266.4 mg·L−1·day−1. Monod growth model was applied for the removal of benzene and values were found to be (Ks: 215.07 mg·L−1; μmax: 0.314 day−1)

Bio-nanotechnology application in wastewater treatment

The nanoparticles have received high interest in the field of medicine and water purification, however, the nanomaterials produced by chemical and physical methods are considered hazardous, expensive, and leave behind harmful substances to the environment. This chapter aimed to focus on green-synthesized nanoparticles and their medical applications. Moreover, the chapter highlighted the applicability of the metallic nanoparticles (MNPs) in the inactivation of microbial cells due to their high surface and small particle size. Modifying nanomaterials produced by green-methods is safe, inexpensive, and easy. Therefore, the control and modification of nanoparticles and their properties were also discussed

Anorectal malformation associated with klippel–Feil syndrome: A rare association

Anorectal malformations (ARMs) are a complex group of malformations associated with various congenital anomalies. Klippel–Feil syndrome (KFS) is characterized by fusion of cervical vertebrae, short neck, torticollis, and/or facial asymmetry and very rarely associated with ARM. In the presence of cervical vertebral anomalies in ARM, one should search for the presence of KFS as an association. If this anomaly is found to be associated, caution is needed during positioning for examination, surgery, during laryngoscopy, and intubation due to risk of neurological damage. We hereby present a very rare association of KFS with ARM with solitary kidney and ipsilateral vesicoureteral reflux