Pellon Biosampo - Manure processing system

Pellon liquid manure processing system is a new microbiology mediated technology that effectively decreases the odour of liquid manure and enables fractionation of the processed manure to  1. SOLID FRACTION, WHICH CAN BE USED AS PHOSPHORUS FERTILIZER, 2. NITROGEN FERTILIZER AND 3. WATER. Microbial processing is based on an amendment of a selected and enriched soil microbe population. The process presented employs moderate aeration at temperatures 20-30°C and gradually leads to highly efficient humification that is prerequisite for the fractionation. In the designed biological process the final product is completely odorless and considerably reduced of pathogenic organisms.

Modern farms generate large amount of animal waste that must be properly managed to ensure good environmental quality. Particularly in intensive livestock areas the risk of nutrient losses to the environment is high as nutrient balances of arable land are higher than elsewhere. Though a valuable plant nutrient, slurry contains about 95 % water and thus the cost of storage, transport and application are high.

New microbial mediated manure treatment system
Process scheme of the designed slurry processing system is presented in Fig. 1.  First slurry is pumped from storage tank on a solid separator belt.  After primary separation solid fraction goes to a screw press separator.  Separated liquid fraction is further treated by chemical flocculation allowing more extended solid separation.  At this state the separated liquid fraction dry matter content is about 1 %.

Fig 1. 


Liquid fraction is drawn through a pipe to a compartmentilized aeration system. Biological aeration treatment is carried out in 4m3 tanks. Tanks are built in a insulated container. Feedback of effluent slurry from the last tank to the first tank is also introduced Aeration is conducted by high pressure blower, rota meters and in each tanks conducted membrane diffusers. Releasing gases are collected and further led to a scrubber.




End products use
High phosphorus content solid fraction can be used as phosphorus fertilizer being spread on a field. Separated liquid fraction can be either spread (or irrigate) on the nearby fields.

Benefits of solids separation
Manure separation serves several advantages. These include high phosphorus concentration containing solid fraction (– on the level of inorganic phosphorus fertilizers) allowing a greater handling distance and efficient recycling of manure phosphorus. Composting of manure solids will create temperatures high enough to kill of bacteria while producing stabilized soil amendment (or bedding source). Separation also reduces the volume of manure storage needed, improve anaerobic digestion, improve the effectiveness of biological treatment, and minimizes odors.

Benefits of slurry aeration
Achieved hygienic state and odor reduction are the most pronounced benefits of slurry aeration. Besides hygienic quality aeration has also other positive effects e.g. on silage sanitation and on yield level. Aerated slurry is highly homogenous and it is easy to spread contributing on silage sanitation and yield level.