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The use of digesters to produce biogas from wastes is not a new technology. However, the applicability of the technology to any given waste streams can be difficult to predict given thelimiteddataonmanyindustrialwastes. Applicationhistoryisalsoexclusivelyoriented toward municipal biosolids and confined animal raising operations (mainly dairyand swine production). Inmostcases,conversionnumbersgenerallyrangeinthe3-6cubicfeetper pound of COD degraded (COD is a standardized chemical oxidation analytical method used to estimatethepollutionstrengthofawastewater). Historically,111-scaledigestionapplication efforts have produced very mixed results with financial and technical problems often noted (manyoftheseeffortsfieldedintheMidwestUS). Applicabilityofdigestiontowardother wastes tends to be very much a case-by-case basis at this stage of development. However, where successes have been noted with the industrial application of digestion, these tend to be food processing based (which bodes well for application within Louisiana). Project Scope This pilot study intends to evaluate the potential for producing biogas from a variety of Louisiana-basedwastestreams. Severalpilotevaluationsusinganovelpilotdigesterplant designedandconstructedbyUL Lafayette,willbetestedatactualcommercialoperations. Severalcandidatewastestreamsarebeingconsidered. Bench-scaletestsareperformedatUL Lafayette to first assess if the waste is digestible and second to determine the optimal operating conditionstobeusedinthepilotreactor. Notallcandidatewastestreamstestedatthebench levelwillbealsotestedatthepilotlevel. Onlythosethatshowreasonablepromisewillbetested in the pilot system due to time and cost limitations. As stated above, prior to performing the on-site pilot studies, a series of bench-scale experiments are being performed to determine the following: 1. Determine if a candidate waste stream has appreciable amount of digestible organicspresentasidentified by the steadyproductionof gas within 500-ml microcosms; 2. Assess methods to optimize biogas production via the dosing of nutrients and other similar amendments including bacterial seeds and vitamins; 3. For waste streams showing minimal biogas production, yet having CODs above 1,000 mg/l, evaluate pretreatment methods using p o w e m chemical oxidizers to partially degrade the complex, recalcitrant organic chemicals into intermediate by-products that should be easier to anaerobically degrade into biogas; 4. Maximize the methane to carbon dioxide ratio using differing reactor operations and selected microbial seeds (greater than 60%methane is consider good); and 5. Perfom continuous flow experiments to determinethe long-term stability of the overall bench-scale digester system using the real waste streams. 35 PD.8360793"2PDF Image | THE APPLICATION OF KENTUCKY POWER
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