Integrating an anaerobic Bio-nest and an aerobic EMMC process as pretreatment of dairy wastewater for reuse: a pilot plant study

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dc.contributor.authorKongsil, Piyalerg
dc.contributor.authorIrvine, Joshua Lelemia
dc.contributor.authorYang, Ping-Yi
dc.date.accessioned2018-10-28T22:44:01Z
dc.date.available2018-10-28T22:44:01Z
dc.date.issued2009-04
dc.description.abstractA large dairy farm located on the island of Oahu, Hawaii was the site for an investigation for the potential integration of the existing facultative lagoon system with a cost effective pretreatment unit process. Based on the results from a laboratory study, a pilot plant was installed with two anaerobic bioreactors (10 m3 each) and one aerobic reactor (3.8 m3 ). Two layers of media β€˜β€˜Bio-nest,’’ providing a void volume of 98%, were placed into each anaerobic bioreactor with 19% space-based on the bioreactor water volume. For better performance and reduction of shock-load, the equalization/settling tank was employed prior to the first anaerobic Bio-nest reactor. The intermediate holding tank settled effluent suspended solids from the Bio-nest reactor and adjusted the loading rate in order to improve the performance of the aerobic EMMC (entrapped mixed microbial cell) bioreactors. Based on the start-up operation of the Bio-nest system at an organic loading rate of about 1.5 g TCOD/l/day, the production rate of biogas from the first and second Bio-nest reactors was 0.64 and 0.15 l/l/day, respectively. This indicates that the anaerobic degradation of organics occurs mainly in the first Bio-nest reactor due to the low loading rate. The removal efficiency from the Bio-nest system shows TCOD removal of about 70%. The EMMC process provided fur- ther treatment to achieve a removal efficiency of TCOD at about 50% and a TN of about 35%. The cost for these pretreatments in order to be integrated with the existing lagoon system is US $1.1 per 1,000 gallons (3.8 m3) for dairy wastewater and $91 for each ton of TCOD removal. This integration system provides a sustainable improvement of environment and agricultural production.
dc.identifier.urihttp://hdl.handle.net/10125/58962
dc.language.isoen-US
dc.rightsAn error occurred on the license name.
dc.rights.uriAn error occurred getting the license - uri.
dc.subjectAnaerobi Bio-nest
dc.subjectBiogas
dc.subjectDairy wastewater
dc.subjectEntrapped mixed microbial cell
dc.subjectExisting lagoon
dc.titleIntegrating an anaerobic Bio-nest and an aerobic EMMC process as pretreatment of dairy wastewater for reuse: a pilot plant study
dc.typeArticle
dc.type.dcmiText

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