24 12 2011 12 Research of Environmental Sciences Vol 24 No 12 Dec 2011-100048 - - - - 120 80 min 2 500 r min X705 A 1001-6929 2011 12-1430 - 05 Hydrothermal Process-Centrifugation for Separation of Waste Grease from Restaurant Garbage NING Na REN Lian-hai WANG Pan YUE Jian-wei College of Food Science and Technology Beijing Technology and Business University Beijing 100048 China Abstract Hydrothermal process-centrifugation was used to improve the recovery rate of waste grease from restaurant garbage The effects of heating time temperature and centrifugation speed on the recovery rate of waste grease from the restaurant garbage were investigated by experimentation At the same time appropriate technological conditions suitable for waste grease recovery from restaurant garbage were defined through comparison with the hydrothermal process-gravitation process The results showed that the hydrothermal process-centrifugation was much better than hydrothermal process-gravitation process for the recovery of grease from restaurant garbage With increased temperature and heating time the de-oiling performance of the restaurant garbage improved Furthermore the trend became more remarkable as temperature increased When the temperature and the heating time reached 120 and 80 min the efficiency of the interior solid grease liquefaction and extraction was optimal The optimum centrifugation speed for oil separation from the restaurant garbage effluent was 2500 r min The grease separation rate reached the highest under these conditions Key words restaurant garbage hydrothermal process centrifugation grease recovery 1-4 2011-03 - 31 2011-05 - 23 2010D005003000004 201109035 1986 - ningna860204@ 163 com * 1971 - renlh@ th btbu edu cn 5-12 wwwcn-
12-1431 13-16 W201B W - O DHG - 9145A 17-20 1 000 ml 21-23 - - 1 2 3 4 1 1 1 1 Fig 1 Flow chart of experiment 1 3 GB T 6433 2006 1 24 2 500 g 1 3 Table1 Physical and chemical data of restaurant garbage w % ph 50% % 6 52 78 3 2 28 12 9 26 4 7 67 w w w w 2 Table 2 Measurement methods 80 90 100 110 120 5 1 ph GB 6920 86 20 40 60 80 100 min 5 2 GB T 6435 2006 3 w GB T 6434 2006 4 w GB T 6432 1994 5 w 6 w GB T 6433 2006 GB T 6438 1992 1 000 1 500 2 000 2 500 3 000 r min 5 10 1 2 5 10 1 AY220 15 20 25 30 35 40 45 50 min SC - 3610 wwwcn-
1432 24 2 2 1 0 5 ~ 15 μm GB T 6433 2006 28 78% 25 3 80 80 min 100 60 min 120 20 min 1 000 3 1 500 2 000 2 500 3 000 r min 2 2 2 500 r min 2 500 r min 2 500 r min 3 2 500 r min 3 22 35% 19 59% 20 93% 3 Fig 3 Difference of grease before and after the hydrothermal process 1 80 80 min 2 120 20 min 21 3 100 60 min 2 2 2 2 Fig 2 Centrifugation speed on the recovery of grease 2 2 2 2 1 2 500 r min - 4 1 μm 4 wwwcn-
12-1433 O W 26 120 80 min 27 16% 3 80 min Table 3 Conditions of hydrothermal process 1 2 3 4 5 6 7 8 9 10 80 80 90 90 100 100 110 110 120 120 20 40 60 80 100 20 40 60 80 100 min 1 80 2 90 3 100 4 110 5 120 4 Fig 4 Recovery of restaurant garbage b grease vs heating time 2 3 2 500 r min 10 3 c 5 10 15 20 25 30 35 40 45 50 120 80 min 2 500 r min min 27 16% 5 5 References 1 M 2009 7-10 2 27-32 5 Fig 5 3 Centrifugation and gravitation on the recovery of restaurant garbage grease a J 2007 20 2 72-77 3 J 2003 16 6 16-18 4 J 2005 6 10 53-57 5 CO 2 J 2010 23 4 521-526 6 J 2009 wwwcn-
1434 24 49 3 386-389 7 REN Lianhai NIE Yongfeng LIU Jianguo et al Impact of Hydrothermal process on the nutrient ingredients of restaurant 19 QUITAIN A T FAISAL M KANG K et al Lowmolecularweight garbage J Journal of Environmental Science 2006 18 5 1012-1019 carboxylic acids produced from hydrothermal treatment of organic wastes J J Hazard Mater 2002 93 2 8 REN Lianhai NIE Yongfeng JIN Yiying et al Study on 209-220 hydrothermal process for restaurant gaebage CThermal 20 TSANG K R VESILIND P A Moisture distribution in sludges treatment and resource utilization of wastes Beijing Institute of J Water Sci Technol 1990 22 12 135-142 Engineering Thermophysics Chinese Academy of Sciences 21 2005 524-535 J 2006 46 9 9 REN Lianhai HAN Tao WANG Pin Impact of surrounding temperature on the procedure of aerobic composting for the 1551-1554 22 restaurant garbage CThe fourth asian-pacific landfill J 2006 22 3 73-76 symposium Shanghai Tongji University Press 2006 656-663 10 REN Lianhai TIAN Yuan CUI Lifeng et al Impact of initial temperature on the aerobic composting of restaurant garbage 23 J 2006 27 9 1906-1911 24 M CProceedings of the 12th international symposium on 2008 77-141 water-rock interaction London Taylor & Francis Group 2007 1609-1614 11 REN Lianhai TIAN Yuan Hydrothermal process for restaurant garbage C1st International conference energy environment 25 J 2000 20 6 38-43 26 J & sustainable development for growing economies energy 2000 40 10 61-64 environment & sustainable development for growing economies Jamshoro Pakistan Higher Education Commission Pakistan & Sindh Environment Protection Agency 2009 5-40 27 J 1997 10 4 238-239 28 HANKINS N P HARWELL J H Application of coherence 12 J theory to a reservoir enhanced oil recovery simulator J 2009 7 52-55 13 ARNOLD P Used cooking oil turned into diesel fue J Bio Cycle 2002 43 5 42-43 14 BEGUM M RAI V R LOKESH S Effect of mycoflora on the physico-chemical characteristics of oil obtained from the infected sunflower toria and sesame seeds J Journal of Food Science and Technology-Mysore 2003 40 6 626-628 15 LEES R P Increasing control and accuracy in the separation process by density profiling J Measurement and Control 2002 35 6 164-167 16 VEIL J A Interest revives in downhole oil-water separators J Oil Gas Journal 2001 26 47-56 17 ABDEL-GAWAD S ABDEL-SHAFY M Pollution control of industrial wastewater from soap and oil industries a case study J Water Sci Technol 2002 46 4 77-82 18 KOPP J DICHTL N Influence of the free water content on the dewaterability of sewage sludges J Water Sci Technol 2001 44 10 177-183 Journal of Petroleum Science and Technology 2004 42 1 29-55 29 RODIONOV I V New advanced methods for oil recovery applications and problems J Neftyanoe Khozyaistvo 2003 4 17-18 30 SHARIFI H SHAW J M Secondary drop production in packedbed coalescers J Chemical Engineering Science 1996 51 21 4817-4826 31 SHANABLEH A JOMA S Production and transformation of volatile fatty acids from sludge subjected to hydrothermal treatment J Water Sci Technol 2001 44 10 129-135 32 HIRASAKI G ZHANG D L Surface chemistry of oil recovery from fractured oil-wet carbonate formations J Spe Journal 2004 9 2 151-162 wwwcn-