Abstract
The problem of livestock excretion disposal is issuing recently because of collectivization and scale-up of the livestock industry. Livestock wastewater is a kind of high-concentrated organic wastewater, so it is treated by anaerobic digestion process because treating by aerobic has a lot of restrictions from technical aspect. Anaerobic process is possible to decompose the organic matters and this process generate end product a little. Futhermore, it can remove intestinal parasites and produces the bio-gas which contains methane. But Anaerobic process is difficult to operate because of low temperature in the field. Therefore, to operate anaerobic process in the field, autothermal aerobic digestion has to be applied to transfer a heat. The object of study is to research treatment efficiencies, the operation property and possibility of liquid fertilizer production by the new-type reactor which is connected the anaerobic process and the autothermal aerobic process.
This result indicates that as a result of liquid fertilizer, every mode was satisfied the official standard of commercial fertilizer of water, N, P, K, heavy metal and odor level. In case of odor removal efficiency, especially, this result shows that bacillus sp. has a great efficiency that is its unique characteristic to remove odor material such as H2S and NH3. There was unusual thing that delicate soil smell was checked. It substantiates that characteristic of bacillus sp., one kind of soil microbe, was reflected in this result. In case of mode 3, however, salt was over the required amount(acceptable standards, 0.3%). When salt is accumulated on the ground, it becomes stiff and turn to acid soil, so follow-up process has to be considered to remove salt for liquid fertilizer.
