| 摘要 |
<p>A wastewater treatment apparatus for a method of wastewater treatment with microorganism granules is provided in which the microorganism granules are prevented from being reduced to smaller granules and thereby flowing into treated water, by efficiently separating the bubbles from microorganism granules having bubbles adherent thereto and minimizing contact between bubbles and the microorganism granules. The apparatus yields treated water of stable quality at an intact efficiency of wastewater treatment, and can be operated under a high load. A spiral plate (3) is disposed in a reactor vessel (1). Bubbles (10) and microorganism granules having bubbles adherent thereto (12) rise from a sludge bed (9) along the lower side of the spiral plate (3). During this rising, the bubbles (10) are separated from the microorganism granules (11) due to the flow and contacts caused by the bubbles (10), the impact of contacts with the spiral plate (3), etc. As a result, the microorganism granules (11) slip down along the upper side of the spiral plate (3) located under that lower-side part of the spiral plate (3), and return to the sludge bed (9) located in the lower part of the reactor (1). The granules (11) in the bed (9) are again mixed and contacted with wastewater (6) to contribute to biodegradation.</p> |
