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Enhanced solid-liquid separation of dairy manure with natural flocculants

Abstract::: The aim of this study was to determine the effectiveness of natural flocculants to reduce solids and nutrient loads in dairy cow wastewater using solid-liquid separation; chitosan was used as a model. Its use efficiency and optimum application rate were determined using flushed dairy cow manure of varied strengths - 0.4%, 0.8%, 1.6%, and 3.2% total solids (TS) content. Treatments consisted of nine rates of chitosan. The flocculated manure was dewatered using 1-mm and 0.25-mm screens. Separation by screening alone was not effective; average efficiencies were about 60% for total suspended solids (TSS), 22% for total Kjeldahl nitrogen (TKN), and 26% for total phosphorus (TP). Mixing with chitosan before screening substantially increased separation. At optimum chitosan rate (0.5g/L for the highest strength effluent), separation efficiencies were >95% for TSS, >73% for TKN, and >54% for TP. The results of this study indicate that natural flocculants such as chitosan are useful for the solid-liquid separation treatment of livestock wastewater.
Author(s):: Garcia, M.C. , Szogi, A.A. , Vanotti, M.B. , Chastain, J.P. , Millner, P.D.
Subject(s):: dairy manure , animal manure management , wastewater treatment , flocculants , chitosan
Description:: Includes references
Source:: Bioresource technology 2009 Nov., v. 100, no. 22
Language:: English
Year:: 2009
Publisher:: [New York, NY]: Elsevier Ltd.
Collection:: Journal Articles, USDA Authors, Peer-Reviewed
File:: Download [PDF]
Rights:: Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.