| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem of decomposition of NH<SB POS="POST">4</SB>HCO<SB POS="POST">3</SB>during evaporation concentration of RO (reverse osmosis) concentrated water in which NH<SB POS="POST">4</SB>HCO<SB POS="POST">3</SB>is concentrated, when organic waste water containing nitrogen is treated with methane fermentation, and after microorganisms are removed from the solution treated with methane fermentation, the solution is desalinated with the RO membrane separation device. <P>SOLUTION: A treatment device includes: a methane fermentation tank 1 for subjecting organic waste containing nitrogen to methane fermentation treatment under an anaerobic condition; MF or UF membrane separation device 2 for separating the solution treated with methane fermentation into solid and liquid; an RO membrane separation device 5 for desalination of the filtrate; an evaporation concentration device 6 for further concentrating RO concentrated water; and a means for adding an acid to RO concentrated water. When an acid such as sulfuric acid or hydrochloric acid is added to RO concentrated water, NH<SB POS="POST">4</SB>HCO<SB POS="POST">3</SB>is converted to a stable strong acid such as (NH<SB POS="POST">4</SB>)<SB POS="POST">2</SB>SO<SB POS="POST">4</SB>or NH<SB POS="POST">4</SB>Cl which does not decompose even when heated, and then RO concentrated water can be evaporated and concentrated. <P>COPYRIGHT: (C)2013,JPO&INPIT |
