Emergy analysis of cassava vinasse treatment |
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| Authors: | Hui Yang Shuri Li |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China;2. Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, China;1. Public Research Centre Henri Tudor (CRPHT)/Resource Centre for Environmental Technologies (CRTE), 6A, avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg;2. Université de Toulouse INSA, UPS, INP, LISBP, INRA UMR792, CNRS UMR5504, 135 av. de Rangueil, 31077 Toulouse, France;1. Research Center for Environmental Determination of Health (RCEDH), Kermanshah University of Medical Science, Iran;2. Student Research Committee, Kermanshah University of Medical Science, Kermanshah, Iran;3. Department of Analytical Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran;4. Water and Wastewater Research Center (WWRC), Department of Applied Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran;5. Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran;6. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Kermanshah, Iran |
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| Abstract: | Vinasse has great pollution to the environment. A number of technologies have been explored for reducing the pollution of vinasse. Sustainability has become an important factor when discussing wastewater treatment techniques. Emergy analysis was used to evaluate the treatment of cassava vinasse in this paper. Cr (emergy consumption ratio) as a new emergy index was proposed to measure the impact of waste treatment to the society. Centrifugal solid–liquid separation, UASB (up-flow anaerobic sludge bed), and SBR (sequencing batch reactor activated sludge process) are used in the treatment process. The emergy indices for cassava vinasse treatment system were as follows: EYR (emergy yield ratio) was 6.20, ELR (environmental loading ratio) was 5.81, ESI (emergy sustainability index) was 1.07, and Cr was 4.60E+12 sej/m3. The emergy of coal electricity accounts for 46% of all purchased inputs. It is necessary to improve the treatment technology to reduce the electricity used. |
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