Fundamental investigation of separation and purification functions of animal waste water using sawdust of filtration materials
2005
Doshu, N.(Bio-oriented Technology Research Advancement Inst., Saitama (Japan)) | Furuyama, T. | Nishimura, Y.
A simple, low-cost urine sewage treatment method for small and medium hog-raising farms has become necessary with the passage of a stricter Water Pollution Control Law. The present study investigates how repeated sprinkling of pig waste water at 100 l/m2/day on a 45 cm-thick sawdust t layer and filtering in the sawdust layer can remove water pollutants in pig waste water. The filtration was conducted for two months, and the average removal rates were 74.5 to 91.5% for SS, 25.9 to 54.9% for BOD, and 3.9 to 20.3% for NH4-N + NOx-N. The removal rate of SS became high, removal of BOD was about 50%, and removal of nitrogen was equal to or less than 20%. In this filtration system, microbes from pig waste water actively attacked pollutants, and physical filtration by sawdust removed them. Organic matter in waste water was broken down, and BOD and nitrogen were removed to some extent. Utilizing sawdust as filtration materials to purify pig waste water was demonstrated to be both simple and effective. Furthermore, it was necessary to increase the sedimentation height of the filtration layer and to stir filtration materials in order to improve filtration ability.
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