Abstract
The amount of rock phosphorous remained in the world is limited. Therefore, it is important to develop the technology and construct the social system for use of recycled phosphorous. Municipal wastewater contains 5 to 10 mg/1 of phosphorous on suspended and soluble forms. This paper deals with separation of phosphorous from municipal wastewater by pre-coagulation, and use of plant functions to secrete acid phosphatase and organic acids that lead to release of soluble inorganic phosphate from the pre-coagulated sludge.Acid phosphatase and organic acids such as citricacid will release soluble inorganic phosphate from organic phosphates and hardly soluble inorganic phosphates, respectively. Production of pre-coagulated sludge took place in a solid liquid separation unit consisting of the jet mixed separator and inclined tube settlers. The unit removed more than 90 % of total phosphorous from municipal wastewater with the addition of poly aluminum chloride of 5 mgAl/l. A production method to depress the polymerization of the polysilicato iron, a new coagulant that seems to be preferable to aluminum coagulants in the pre-coagulation scheme. is also described. Phosphorous compounds contained in the pre-coagulated sludge were transformed to soluble inorganic phosphates by acid phosphatase and organic acids. The excess sludge worked as a phosphate fertilizer for sugar beet, resulting in about 5 times the dry weight compared that obtained in the phosphate-deficient condition when acid phosphatase was added in the root compartment.
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Watanabe, Y., Tadano, T., Hasegawa, T., Shimanuki, Y., Ødegaard, H. (2000). Phosphorous Recycling from Pre-Coagulated Wastewater Sludge. In: Hahn, H.H., Hoffmann, E., Ødegaard, H. (eds) Chemical Water and Wastewater Treatment VI. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-59791-6_33
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DOI: https://doi.org/10.1007/978-3-642-59791-6_33
Publisher Name: Springer, Berlin, Heidelberg
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