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Chemical Treatment of Dairy Manure Using Alum, Ferric Chloride and Lime

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  024093,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10485) @2002
Authors:   K.G. Karthikeyan, Mehari Z. Tekeste, Mahmoud Kalbasi, Kerem Gungor
Keywords:   alum, FeCl3, lime, phosphorus, solids, coagulation, dairy manure

Chemical treatment of dairy manure with alum [Al2(SO)4)3], ferric chloride [FeCl3] and lime is capable of achieving good solid-liquid separation and concentrating phosphorus [P] in the solid phase. Batch level jar tests conducted using dairy manure containing 0.8 % and 1.6% total solids [TS] indicate that very high removal [>90%] of dissolved reactive P [DRP], total dissolved P [TDP] and total P [TP] can be achieved with chemical addition. In the absence of coagulants, 43% of TP and 30% of TS were removed via gravity settling. Treatment performance varied with chemical type, dosage rate and the initial manure solids concentration. FeCl3 and alum were similar in their efficiency to separate P and solids from the manure slurry. At 8 mM as Al dosage rate for 0.8% TS, alum reduced solution DRP, TDP, and TP levels by 99%, 92%, and 92%, respectively. Lime was less effective than alum/FeCl3 in concentrating TDP and TP with the trend being reversed for TS. At 40 mM as Ca dosage, lime removed 96%, 70% and 69% of DRP, TDP and TP, respectively, for 0.8% TS. Under all treatment conditions, TS and TP removal levels were lower than the extent of removal of other solid and P forms. At the same coagulant dosage, separation of solids and P decreased with an increase in initial manure solid concentration [from 0.8% to 1.6% TS].

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