Section 10. AGRICULTURAL WASTES
INTEGRATED SWINE WASTE MANAGEMENT SYSTEM
A PRELIMINARY STUDY
P. Y. Yang, Associate Professor
S. Y. Nagano, Graduate Research Assistant
J. K. Lin, Graduate Research Assistant
U. T. Wong, Graduate Research Assistant
Department of Agricultural Engineering
University of Hawaii
Honolulu, Hawaii 96822
In the past decade, anaerobic lagoons have been used as the principal waste treatment
process by most of the hog producers in the U.S. After contacting major hog producers in
Hawaii, the lagoon system has been considered only as a collection pond for all the wastewater produced from the farm. This has resulted in lack of appropriate lagoon management
for the subtropical environment and has created odor problems because of overloading
and buildup of solids in the lagoon. Additionally, lack of available land and encroachment
of urban development are serious problems, especially on the island of Oahu. Thus, the
anaerobic lagoon system cannot be considered the most appropriate waste management
system.
In order to correct the problems and defects associated with using an anaerobic lagoon
as a means of swine waste management, a system should be developed to provide the following benefits: (a) Minimizing "public nuisance" problems; (b) Providing an enhanced energy
source in the form of methane that can be used for on-farm energy consumption; (c) Producing an odorless organic and inorganic fertilizer; (d) Saving water for flushing; and (e)
Requiring less land use for waste management system. This system has been proposed and
is shown in Figure 1. Having this type of system in mind, two key biological reactors (anaerobic digester and algae-bacteria raceway) should be studied for their appropriate design
and operational criteria. Thus, a complete integrated swine waste management system
incorporating these two biological reactors can be developed.
Figure 1. Flow diagram of swine waste management system.
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