A good way to treat animal wastes which contain
lots of organic matter is to recycle the biomass and return it to the soil. As
animal wastes have become an urgent pollution issue, the Institute has engaged
in the research of animal wastes treatments and utilization. The horizontal
anaerobic digester made with red-mud plastic was invented for treating pig
wastes in 1975, which was the first of its kind in the world. After many years
of studies and improvements, the three-step treating system is now recommended
to the pig producers as the most suitable pig waste treating system. Under
proper operation, the treated waste water can meet the effluent standard of this
country. The process of the treatments is as follows.
The firs-step of waste treating system is the
solid-liquid separation. After operation, the solid material is collected for
The second-step is horizontal anaerobic
fermentation. During anaerobic fermentation, biogas is generated as a byproduct.
Biogas may be used as sources of fuel for the stove, water heater, piglet
warming, water pump, electricity generation, automobile, etc. The effluent from
anaerobic digester can also be used for cultivation of algae to further clear
the water, and also provide feeds for fisheries.
The third-step is an aerobic treatment. Both
activated sludge process or oxidation ditch process are used and the excess
sludge generated in this step can be dehydrated and used as fertilizer. The
management of the waste water treatment system can be automatized by the
computer to save labor. In another application of anaerobic fermentation, the
Institute developed the treatment of dead animals using anaerobic fermentors.
Pig farmers may adapt this device by modification from the three-step waste
water treatment system. This device is patented by the Central Bureau of Patent
in Taiwan, ROC. Since the regulation of effluent standard becomes more and more
strict, the Institute has developed a manure-bed pig house. The bed area is
paved with rice-husk to absorb the pig manure and there is no waste water
generated. The organic materials in the manure is converted into fertilizer
during composting. Replacing part of chemical fertilizer, the matured compost is
applied to forage land to increase the production of forage crops and improve
the soil fertility. In order to promote the application of composting, the
Institute completed the development of pelleted compost, which is put into small
bags for home gardening and other purposes. Besides, for recycling of treated
waste water, the original three-step waste treatment system was modified. The
anaerobic fermentor was separated into two sections.
SV30 sedimentation test id
used for evaluating the operation of aerobic treatment set-up
The second section was added after aerobic treatment. The hydraulic detention
times for both sections were 6 days. These modification could increase the
stability of the effluent. After the final effluent is disinfected, it is ready
for use in recycling, to clean pig houses. In addition, the studies on removal
of nitrogen and phosphorus from waste water are underway, and the preliminary
results indicated that removing efficiencies of them reached
Automatic pig house washing
The study on raising beef cattle under forest trees to save number of times
and labour in weeding after planting young trees, has been completed with
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