Field-Scale Surface Aeration System to Reduce Odor Generation
A field-scale surface aeration system was tested from mid-June to mid-October in this study. About 0.14 ha (1/3 acre) of the liquid manure storage was surface-aerated continuously for four months, with the unaerated portion as the control. The aeration system consisted of a venturi air injector modu...
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Published in | Transactions of the ASABE Vol. 52; no. 2; pp. 615 - 620 |
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Main Authors | , , |
Format | Publication |
Language | English |
Published |
2009
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Subjects | |
Online Access | Get more information |
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Summary: | A field-scale surface aeration system was tested from mid-June to mid-October in this study. About 0.14 ha (1/3 acre) of the liquid manure storage was surface-aerated continuously for four months, with the unaerated portion as the control. The aeration system consisted of a venturi air injector module, a 1.1 kW centrifugal pump, and a distribution frame made of PVC pipes. The results indicated that the solids removal efficiencies were 39.64% for TVS and 16.55% for TS after four months of aeration, while the ratio of TVS to TS decreased from about 49% to 31%. In the first seven weeks, the BOD removal efficiency was lower than 20% (9% on average) but increased linearly from 21.5% to 86.5% during the rest operating time. The VFA removal efficiency increased from 5% at the beginning to 85% at the end of the experiment, with the VFA level in the aerated liquid manure was reduced to below 230 mg/L. The linear coefficient between BOD and VFAs was 0.87. The results show that a DO level lower than 0.5 mg/L can still be effective in controlling odor. The electricity cost for running the surface aeration system was estimated at $0.21 per pig finished. |
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Bibliography: | http://asae.frymulti.com/toc_journals.asp?volume=52&issue=2&conf=t&orgconf=t2009 |