Closed wastewater cycle in a meat producing and processing industry |
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Authors: | T Manios E Gaki S Banou A Klimathianou N Abramakis N Sakkas |
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Institution: | a School of Agricultural Technology, Technological and Educational Institute of Crete, Heraklion 71500, Crete, Greece;b Department of Natural Resources Engineering, Technological and Educational Institute of Crete, Halepa 73133, Chania, Crete, Greece;c Laboratory of Environmental Informatics, Technological and Educational Institute of Crete, Stavromenos 71500, Heraklion, Crete, Greece |
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Abstract: | Creta Farm Plc, owns the largest meat producing (pigs rearing), processing and packaging unit in the island of Crete, in Greece, placed outside the city of Rethymnon in the north coast of the island. From the farm, where more than 20 000 pigs of various ages and sizes live, 300–320 m3 of wastewater are collected in a daily basis. From the slaughterhouse and the processing unit another 100–125 m3/d are produced. The wastewater treatment system is a combination of settling and aeration tanks, with decanters operating in different phases of the process, mainly for the removal of the solids from the wastewater. The average biochemical oxygen demand and total suspend solids values of the treated effluent are 40 and 80 mg/l, respectively. From this almost secondary treated effluent about 100 m3 are used for cleaning the sewage pipes of the rearing unit (animals houses). The remaining 300 m3 are disinfected with a weak chlorine solution before used for irrigating trees, grass and various other plants. More than 2000 eucalyptus trees, 1500 tamarix trees and a large number of olive trees are growing in the site creating a pleasant view and at the same time help minimising the odour problem. |
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Keywords: | Pigs rearing Farm Slaughterhouse Meat processing Wastewater Treatment Reuse Closed wastewater cycle |
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