| 摘要 |
<p>PURPOSE: To prevent sludge granules from floating and flowing out and to improve treatment performance by adding a PO4 <3-> source and a specific amount of magnesium salt into drainage in an aerobic treatment process in which organic drainage is passed through an upward current anaerobic sludge bed type high load anaerobic treatment apparatus. CONSTITUTION: Raw water (organic drainage) is first introduced from a pipe 11 into an acid production tank 1 to decompose sugar, protein, etc., in water into volatile lower aliphatic acids. In this process, part of the treated water in a UASB (upward current anaerobic sludge bed) reaction vessel 2 is circulated from a pipe 12 to the raw water introduction pipe 11 to prevent pH from lowering extremely due to the production of acid in the acid production tank 1. Next, water from the tank 1, after being added with Mg salt and a PO4 <3-> source from a pipe 15, is supplied to the reaction vessel 2 by a pump P to be treated anaerobically. The specific gravity of sludge granules containing MAP which are produced in the reaction vessel 2 increases caused by the deposition of MAP so that the sedimentation velocity of the granules increases, and the flotation of the granules is controlled.</p> |
