PhD student , Indian Institute of Technology Guwahati
Mitigating Greenhouse gases from lignocllulose material by Biochemical method (Anaerobic digestion)
Paper industry produces huge amount of wastewater and hence sludge production is a major issue in the wastewater treatment plants. Sludge management through the conventional methods s landfilling produces leachate and incineration emits greenhouse gases. Therefore strong public opposition and strict regulatory pressure have been perceived in many countries. This has urged the industry to look for alternative disposal options. With the demand for energy growing worldwide and climate changes on the rise, anaerobic digestion a versatile technology for renewable energy generation through non-oxidative metabolism, has become an alternative energy source. The characteristics of paper mill sludge will be studied and different types of pretreatment such as physical, chemical, biological will be investigated for the enhance and shorten the hydrolysis step prior to anaerobic digestion. BMP (1 L) and batch scale (25 L) study will be carried out to see the best F/M ratio and optimum hydraulic retention time (HRT) respectively. From the optimum results, a new bioreactor will be design, fabricate and operate as a lap scale continuous reactor to optimize the organic loading rate (OLR). Finally pilot scale reactor will be design, fabricate and operate for the feasibility study under varied climatic condition.
Abstract: The objective of the study was to assess the effect of substrate concentration by specific methanogenic activity (SMA) of thermally pretreated pulp and paper mill sludge. Different substrate concentration through food to microorganism ratio varied from 1.0 to 3.0 was carried out in a mesophilic condition as biochemical methane potential assay. Experimental results offered that cellulose removal rate spikes up to 60.2%. The specific methane gas production and biodegradability were increased up to 303mL of CH4/g VS and 73% respectively. By increasing the substrate concentration, SMA was significantly improved in a linear manner. The net energy of 8735kJ was gained after thermal pretreatment. In addition to that three kinetics model were used, among that the modified Gompertz and logistic function models represent and reproduce the experimental data, while the earlier has the better fit.
Pub.: 27 May '17, Pinned: 01 Sep '17
Abstract: This novel work is focused on evaluating the electrohydrolysis pretreatment conditions (applied voltage and time) and anaerobic digestion process for the biological bioconversion of pulp and paper mill sludge into biogas in batch assay. The pretreatment at 15 V for 45 min shows highest impact on sludge solubilization. The XRD and FT-IR spectroscopic characterization shows the development of aliphatic, unsaturated and carbonyl carbon functionalities in the pretreated samples. FESEM picture also qualities the change in alteration of structure after pretreatment. Batch anaerobic bioreactor was carried out to determine the efficacy of electrohydrolysis pretreated and untreated pulp and paper mill sludge. The methane production potential was increased from 274±5 to 301±4 mL CH4/g VS after electrohydrolysis pretreatment.
Pub.: 25 Mar '17, Pinned: 01 Sep '17
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