Scum removal apparatus

Liquid purification or separation – Gravitational separator – Mechanical constituent mover

Patent

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Details

210526, B01D 2124

Patent

active

054239877

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention generally relates to a scum removal apparatus for efficiently removing scum floating in a sewage treatment pool and, more particularly, to the simplified scum removal apparatus of a type effective to efficiently remove scum by the utilization of a driving power generated by a movable member installed in the sewage treatment pool and without relying on a dedicated driving power.


BACKGROUND ART

FIGS. 25 and 26 of the accompanying drawings illustrate the scum removal apparatus suggested by the inventor of the present invention. A generally rectangular sewage settling pool is provided with a plurality of, for example, four, sprocket shafts 200 extending in a widthwise direction of the sewage settling pool, a pair of sprocket wheels 201 mounted on each of the sprocket shafts 200 and generally endless, left-hand and right-hand chains trained around the sprocket wheels 201 on the sprocket shafts 200. In the suggested scum removal apparatus, some or all of the flights 203 secured to the chains 202 are driven together with the chains 202 to draw and remove the scum floating on the water surface in the sewage settling pool.
The scum removal apparatus includes a trough 205, a guide support sheet 206, a weir member 208 and a transmission mechanism 209. The trough 205 is in the form of an elongated member of a generally U-shaped cross-section opening upwardly and frontwardly and is fixedly disposed in the sewage settling pool so as to extend in the widthwise direction of the sewage settling pool.
The guide support sheet 206 is a band of rubber material of a length corresponding to that of the trough 205 and secured at one front side portion to an upper edge of a front wall of the trough 205 with the opposite rear side portion thereof protruding frontwardly from the front wall of the trough 205 so as to undergo undulation by the effect of its elastic deformation.
The weir member 208 is in the form of a generally elongated member having a front portion of a generally fight triangular hollow cross-section and a rear portion of a generally rectangular cross-section and has a base portion secured to the front side portion of the guide support sheet 206 so as to protrude outwardly therefrom so that, while supported by the guide support sheet 208, the weir member 206 can undergo a wavy motion above and below the fluid surface level 207 of sewage in the sewage settling pool.
It is the transmission mechanism 209 that drive the weir member 208 to move up and down with respect t the fluid surface level 207 in the sewage settling pool. This transmission mechanism 209 includes a rotary support shaft 210, a drive arm 211, and an operating arm 212. The rotary support shaft 210 is supported so as to extend widthwise of the sewage settling pool whereas the drive arm 211 is supported so as to extend from one end portion of the rotary support shaft 210 in a frontward direction substantially perpendicular to the rotary support shaft 210. The operating arm 212 is supported so as to extend in a direction counter to the direction of extension of the drive arm 211 and towards the trough 205 and is employed for each of the left-hand and right-hand sides of the sewage settling pool for the purpose of a stabilized operation. The drive arm 211 has a front end portion provided with a follow-up member 213.
The follow-up member 213 has a cam face defined at a bottom thereof, which cam face is constituted by two hill areas 213a and 213c and a dale area 213b positioned between these hill areas 213a and 213c. It is a roller (a drive unit) 214, protruding outwardly from one end of each flight (mud dragging member) 203, that drives the follow-up member 213 to actuate the drive arm 211 and the operating arm 212 to move the weir member 208 up and down with respect to the fluid surface level 207 of sewage in the sewage settling pool. This roller 214 is supported by a bracket secured to one end of the follow-up member 213 associated with each flight 203. Reference numeral 220 shown in FIGS. 25 and 26 represent

REFERENCES:
patent: 3081879 (1963-03-01), Schroeder et al.
patent: 4136030 (1979-01-01), Seiko et al.
patent: 4268394 (1981-05-01), Wolfe
patent: 4277334 (1981-07-01), Ruidisch et al.
patent: 5057219 (1991-10-01), Fujiwara
patent: 5087380 (1992-02-01), De'Toffoli
patent: 5200079 (1993-04-01), Schwartz et al.

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