Water and Wastewater treatment, Solid Waste Management
2
Scopus Publications
53
Scholar Citations
1
Scholar h-index
1
Scholar i10-index
Scopus Publications
Role of Biokinetic Parameters in the Methane Emission Characteristics of MBT Waste T. G. Parameswaran, Navneeth R. Krishnan, P. Sughosh, G. L. Sivakumar Babu, Curtis M. Oldenburg Journal of Hazardous Toxic and Radioactive Waste, 2022 Biokinetic parameters have been extensively used to decide on the treatment methodology of a waste. Although literature reports studies on biokinetic parameters in wastewater treatments, their significance in the anaerobic treatment of municipal solid waste is not well explored. Furthermore, to the best of authors’ knowledge, the applicability of biokinetic parameters in estimating the gas emission characteristics of a waste have not been reported anywhere. TOUGH2 Landfill Bioreactor Model (T2LBM), a module for the TOUGH2 simulator that provides simulation capabilities for the process of biodegradation of waste governed by a modified form of Monod’s growth model, is used to investigate the same. As an initial step, numerical modeling with T2LBM is carried out to validate the gas emission characteristics of an anaerobic bioreactor that degrades a mechanically and biologically treated (MBT) waste. A good match for the gas yield and waste settlement proves the model’s capability to simulate the process of biodegradation. A parametric study of the biokinetic parameters (namely the yield coefficient, saturation constant, growth rate, and death rate of microbes) helped establish the relation of these parameters with the methane emission characteristics through Monod’s kinetics. The relation of these parameters with the methane yield is also substantiated using time-dependent variation of substrate utilization. The values of the biokinetic parameters of the MBT waste indicate the suitability of anaerobic digestion to degrade MBT waste.
Analysis of metronidazole removal and micro-toxicity in photolytic systems: Effects of persulfate dosage, anions and reactor operation-mode N. Neghi, Navneeth R. Krishnan, Mathava Kumar Journal of Environmental Chemical Engineering, 2018 The efficiency of persulfate (PS) alone, UV-C activated TiO2 (UV/TiO2), UV-C activated PS (UV/PS) and UV/PS with TiO2 (UV/PS/TiO2) in the oxidative removal of metronidazole (MNZ) was studied. In addition, applicability of UV/PS process in batch and continuous photo-reactors (BPR and CPR) was investigated. The performance of BPR and CPR was assessed in terms of energy consumed and electrical energy per order (EEO), which indicated that both UV/PS and UV/PS/TiO2 systems were energy efficient. On the other hand, MNZ removal kinetics has revealed a higher MNZ removal rate of 0.232 min−1 in UV/PS/TiO2 system and showed a pseudo-first-order kinetics (r2 > 0.96). Furthermore, the effect of influent anion concentration (i.e. Cl−, SO42−, NO3− and their combinations) on UV/PS system was examined. The sequence of MNZ removal (from highest to lowest) in the presence of anions was (SO42− + Cl− + NO3−) > (SO42− + NO3−) > SO42− > (SO42− + Cl−) > Cl− > NO3−. An oxidative degradation pathway of MNZ in UV/TiO2 system was proposed. The toxicity of treated samples was evaluated using micro-toxicity assay against V. fischeri. The percentage inhibition of effluent samples to V. fischeri was within 15%, which denotes the suitability of CPR for real-time application.
RECENT SCHOLAR PUBLICATIONS
Analysis of metronidazole removal and micro-toxicity in photolytic systems: Effects of persulfate dosage, anions and reactor operation-mode N Neghi, NR Krishnan, M Kumar Journal of environmental chemical engineering 6 (1), 754-761 , 2018 2018 Citations: 53
MOST CITED SCHOLAR PUBLICATIONS
Analysis of metronidazole removal and micro-toxicity in photolytic systems: Effects of persulfate dosage, anions and reactor operation-mode N Neghi, NR Krishnan, M Kumar Journal of environmental chemical engineering 6 (1), 754-761 , 2018 2018 Citations: 53
