スクリュープレス式脱水機、汚泥処理システム及び汚泥処理システムの運転方法

Screw press type dehydrator, sludge treatment system, and method of operating sludge treatment system

Abstract

【課題】脱水機本体内にろ液を溜めてSSを沈降分離して清澄なろ液を排出することによってSS回収率を向上させること。 【解決手段】円筒形状を為す外筒スクリーン3と、テーパ状の軸7の外周に螺旋状のスクリュー羽根9を設け、外筒スクリーン3内に回転自在に配置され、スクリュー羽根9の外周端面が外筒スクリーン3に略接するスクリュー5と、スクリュー5の軸小径部7a側に設けられるスラッジ供給口13と、スクリュー5の軸大径部7b側に設けられるケーキ出口15と、外筒スクリーン3の外周に設けられ、外筒スクリーン3から搾り出るろ液を受ける外筒17と、外筒17に設けられ外筒17内の清澄なろ液を排出する清澄なろ液排出口18と、外筒17に設けられ外筒17内に溜まったSS濃度の高いろ液を間欠的に排出するろ液排出口19とを備える。 【選択図】 図1
<P>PROBLEM TO BE SOLVED: To enhance SS collection rate by storing filtrate in a dehydrator body, carrying out precipitation separation of SS, and discharging clear filtrate. <P>SOLUTION: A screw press type dehydrator includes: a cylindrical shaped outer case screen 3; a screw 5, in which a spiral screw blade 9 is provided in a periphery of a tapered shaft 7 and a peripheral end surface of the screw blade 9 is almost contacted to the outer case screen 3, rotatably arranged in the outer case screen 3; a sludge feed opening 13 provided in a side of a shaft minor diameter portion 7a of the screw 5; a cake outlet 15 provided in a side of a shaft major diameter portion 7b of the screw 5; an outer case 17 provided in a periphery of the outer case screen 3 for receiving filtrate extracted from the outer case screen 3; a clear filtrate outlet 18, provided in the outer case 17, for discharging the clear filtrate in the outer case 17; and a filtrate outlet 19, provided in the outer case 17, for intermittently discharging filtrate with high SS concentration collected in the outer case 17. <P>COPYRIGHT: (C)2011,JPO&INPIT

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