Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1994-08-16
1997-01-07
Reifsnyder, David A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210738, 210787, 2105121, 2102211, 2102212, 209162, 261123, C02F 124, B01D 2126
Patent
active
055913482
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for the central feeding of tanks such as circular grit traps, grit classifiers or settling tanks of circular construction.
The subject of the invention is also a process for feeding such circular grit traps and grit classifiers and settling tanks of circular construction. Finally, the subject of the invention is also the use of the process and of the device for feeding circular grit traps and grit classifiers and settling tanks of round construction in sewage treatment plants.
2. Description of the Prior Art
For reasons of operational reliability, it is usually necessary, in the case of many waste-water and sludge treatment units of the sewage treatment plant, to separate the grits and other mineral substances, which have been entrained in the waste water, from the putrescible, organic substances. The conventional devices for degritting the waste water are, depending on construction type and operation, designated as deep, shallow, circular and aerated grit traps. In the case of the prior-art circular grit traps and grit classifiers of circular construction, the waste water is fed tangentially to a circular hopper-bottomed tank. After flowing through a centering angle of over 180.degree., the waste water passes into the outflow. The great disadvantage with conventional circular grit traps and grit classifiers of circular construction, however, is that, owing to the tangential introduction, the tank volume (region through which flow occurs effectively) provided is not utilized to the optimum degree and the hydraulic efficiency thereof is thus only approximately 50%.
The operating principle of conventional circular grit traps is based on the fact that, in curves, the bed load moves inside the curve. The forced circular motion causes, owing to the centrifugal force in the circular grit trap, a rise in the water level from the rotational axis outwards. Under the influence of the superatmospheric pressure in the edge zone, a circular motion, which is directed towards the center at the bottom, is thus superimposed in the throughflow. This results in a helical flow through the tank. Owing to the radial transverse flow, which is particularly strong at the bottom as a result of the reduced tangential velocity of the waste water there, the grit which has sunk to the bottom is conveyed into the hopper-shaped collecting chamber, in the axis of which there is arranged at least one cylindrical pump pit with mammoth pumps.
SUMMARY OF THE INVENTION
The object of the invention is to provide a device with a central feeding of such circular grit traps and grit classifiers and settling tanks of round construction which is of simplified design, such that, with the same inflow quantity and the same settling volume, an increase in the hydraulic efficiency from 50% to 90% is achieved.
It is further the object of the invention to specify such a process for central feeding, in which the efficiency is improved.
This is achieved in the case of a device for the central feeding of such tanks having a swirl chamber which is connected to the inflow and is in connection with a vertical gravity outlet pipe, a trumpet-shaped body widening from a transition region adjoining the gravity outlet pipe in a seamless manner, in that rotary flow having angular momentum is utilized for feeding circular grit tanks and grit classifiers and settling tanks such that there is activated, at the trumpet-shaped body widening from the transition region, the Coanda effect which, for its part, causes a deflection of the liquid stream, emerging from the vertical pipe and having angular momentum, at least in the horizontal direction or vertically upwards and also causes a radially symmetrical drain-off in the tank, and in that there is arranged, in particular, a conduit pipe, centrally in the gravity outlet pipe, which has preferably circular openings over its circumference and is open at the top towards the atmosphere.
By trumpet-shaped body or widening, it is understood
REFERENCES:
patent: 2338971 (1944-01-01), Ross
patent: 4477341 (1984-10-01), Schweiss et al.
patent: 4759854 (1988-07-01), Wilson
patent: 5075001 (1991-12-01), Taylor
patent: 5139662 (1992-08-01), Ozawa
PTO 96-0364 (Translation of German Referednce No. 159738).
Felder Anton
Valentin Franz
Dishong George W.
Felder Anton
Reifsnyder David A.
LandOfFree
Device for the central feeding of tanks such as circular grit tr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for the central feeding of tanks such as circular grit tr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for the central feeding of tanks such as circular grit tr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1761690