Liquid purification or separation – Filter – Alternating oppositely opening liquid distributors
Patent
1995-06-07
1996-08-06
Hruskoci, Peter A.
Liquid purification or separation
Filter
Alternating oppositely opening liquid distributors
210154, 210162, 2102421, 210248, E03F 514
Patent
active
055430384
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a distribution and control unit comprising a delivery pipe discharging into a chamber with one or more underflows and overflows.
BACKGROUND OF THE INVENTION
In joint drainage systems, in which sewage and rain water are discharged into the same sewer, concentrators are used in order to avoid hydraulic overloading of the purifying plant in case of heavy rain and subsequently big amounts of water in the sewer. The simplest, but also the least effective concentrator, is an overfall construction. Such a construction comprises a reservoir with an outlet, an overfall edge and a delivery pipe, normally with a comparatively big cross-section, because it has to be dimensioned for peak loads. Therefore, the flow rate in the delivery pipe will typically be relatively small and suspended matter will sink towards the bottom of the pipe. Immediately before the overfall construction, the concentration of suspended matter will therefore normally be higher at the bottom than at the top. This effect decreases with increasing flow rate and on account of turbulence. No requirements are made today in overfall constructions with respect to how the delivery is to take place, and a problem is that the turbulence from the overfall edge may be so heavy that the amount of water flowing over the overfall edge may be nearly just as polluted as the amount of water let out through the cutoff outlet to the purifying plant.
Among those skilled in the art there is a general agreement that it serves no purpose to arrange bigger reservoir volumes in joint sewage systems to limit the amount of impurities delivered to the receiver. Thus, measurements have shown that the amount of suspended matter in the water supplied to the receiver is by and large the same irrespective of whether it is supplied through overflow or through a purifying plant which has been peak loaded for a long time, because a purifying plant with a protracted peak load or momentary peak load loses its effect due to the fact that the active sludge is washed away.
SUMMARY OF THE INVENTION
It is therefore the object of the invention to provide a distribution and control unit which is cheap in relation to its effect and which ensures that the biggest possible amount of suspended matter is guided to the purifying plant with the smallest possible amount of water, whereby the variation of the amount of impurities and in particular of the amount of water becomes as little as possible.
This object is met by the invention by means of a distribution and control unit, in which at least one partition wall is provided in an inlet chamber for dividing the inlet in at least two layers and a corresponding division of the chamber into at least two levels, the lower one of which is connected with the underflow and the upper one is connected with the overfall edge. Hereby is achieved that the sewage in the inlet is divided into at least a lower part with a high concentration of suspended matter and an upper part with low concentration of suspended matter, and this division takes place in a place, which only to a slight extent, if at all, is reached by the mixing effect of the turbulence from the overfall edge.
The concentration of suspended matter in the delivery pipe will typically vary over the cross section in such a way that concentrations in the middle of the cross section at a predetermined level is higher than at the sides, or, in other words: the concentration level has a concave profile which is highest in the middle. It may, therefore, be advantageous to construct the partition wall or the partition walls in such a way that the edge which divides the inlet, curves downwardly and is highest in the middle to correspond to the profile of the concentration level.
The distribution and control unit, or short: the control unit, according to the invention may have inlets from a tributary in form of a delivery pipe, possibly an oversize one, or alternatively in form of a duct or a reservoir. The inlet opening to the lowest level of
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Dutch product information sheet of Aug. 1992.
Green Theodore M.
Hruskoci Peter A.
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