| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a biological treatment apparatus performing dewatering treatment such that sludge has a low water content even when dissolution of the sludge in a biological treatment tank has progressed. <P>SOLUTION: Biological treatment water inside the biological treatment tank 1 is supplied to a membrane separation tank 11 by a pump 10, permeated water of a separation membrane 3 inside the membrane separation tank 11 is taken out as treated water, a part of concentrated water is sent back to the biological treatment tank 1, and waste sludge is taken out into a flocculation tank 6. The waste sludge is added with an inorganic flocculant, thereafter is added with a polymer flocculant in the flocculation tank 6 to be performed with flocculation treatment, is performed with concentration treatment by a concentration machine 7, and thereafter is performed with the dewatering treatment by a dewatering machine. As the dewatering machine 8, various kinds of dewatering machines such as a filter press dewatering machine, a belt press dewatering machine, a centrifugal dewatering machine, or an electro-osmotic dewatering machine can be used. <P>COPYRIGHT: (C)2012,JPO&INPIT |
