FR2560868A1 - Compact single-unit purification station - Google Patents

Abstract

Compact single-unit purification station consisting of a single vessel 1 containing a means for aerating and stirring the liquid mass and a settler of very small size, consisting of a bottomless casing and a series of plates 6 inclined at 60 DEG to the horizontal plane; the absence of a conical bottom of the settler adds to the saving in space occupied by the settler and is made possible by the aeration device which allows the sludge to be expelled in step with its deposition at the bottom of the vessel. It has its application in factories and in Public Works departments.

Description

The object of the present invention is a process for treating wastewater by means of a compact monobloc treatment plant operating on the principle of prolonged oxidation.
Many monobloc treatment plants exist But are very limited in size because of the obligation to incorporate a decanter whose surface proportional to the peak flow is large and whose shape is conical. In addition, the problems of sludge recirculation make it difficult to use such stations.

The treatment plant described in this patent consists of a tank (I3 of variable capacity, made of cylindrical steel whose construction is similar to that of fuel tanks
In this tank are successively installed - A mixing and aeration device constituted by a pump (2)
pumping a mixture of water and deaìrl into a venturi (4): air is drawn in trace to the vacuum created by the venturi (4) by means of a tube (3); - A lamellar decanter whose surface is approximately five times smaller than that of a traditional conical decanter of the same capacity.

 The lamellar settling tank consists of a metal box (5) parallel # pipedic, without bottom or cap and integral with the tank in its upper part.

 A series of removable steel plates (6) are slid into the box and positioned on lugs (?) So as to present an angle of 600 relative to a horizontal plane.

 The spacing of each plate is approximately eighty millimeters. The vertical size of this box represents approximately two thirds of the diameter of the tank.

 The wastewater enters the station by means of a pipe (8) and leaves the decanter by means of a pipe (9) by gravity.

 The entire volume of the tank not occupied by the lymphatic separator serves as an activation compartment.

Compared to conventional devices, this station has the following advantages - Higher treatment capacity for a tank of given volume, given the space saving allowed by the use of a lamellar decanter No adjustment of sludge recirculation, surgery
particularly delicate for wastewater treatment plants
low capacity Indeed in the device object of the pre
invention, the sludge falls in the lower part
from the tank and are evacuated progressively by the jet of
the pump (2) provided with the venturi (4).

Of course, the invention will be understood with reference to
to the description and to the drawings # appended by way of example, dried
non-limitative, indicative and are subject to numerous
variant designs and applications as an Indus product
new triel
Figure - I - shows as a whole in longitudi section
nale, the compact monobloc wastewater treatment plant composed of
cylindrical or other tank (I) inside which a box
its (5) (shown here de. trapezoidal shape and integral with its
upper part of the tank (I). At the base of this box are
positioned slats (6) inclined at # an angle of 600
with respect to a horizontal plane, the wastewater enters
the station by means of the hose (8) and exit to the decanter at
of the pipe (9) by gravity.

The entire volume of the tank (I) not occupied by the decanter
lamillaire is used for the activation compartment,
In (2) represents the pump provided with its venturi (4). In (3) the air inlet tube for mixing with the water sucked in
to the depression created by the venturi (4).

It is understood that the invention may vary in form,
matter, dimensions, without altering the principle and
the idea of the invention, ie the aim being to remain within the framework of
the new idea of this patent,

Claims (1)

 R E V E N D I C A T I O N S 10-Process for the construction of a compact monobloc treatment plant  including an activation compartment fitted with an aerator  and a compartment reserved for settling constitutes a  lamellar settling tank, all operating according to the process  says extended ventilation.  29- Process for the construction of a wastewater treatment plant  dication - I -, characterized in that the vessel constituting  the station can be made of reinforced concrete "in Situ 3 - Method of construction of treatment plant according to  claim - I - characterized in that the tank cons  tituant the station can be made of plastic 4 - Method of construction of treatment plant  claim - I -, characterized in that the tank (I)  constituting the station is not necessarily in shape  cylindrical but can be parallel.  5 - Process for the construction of a wastewater treatment plant according to  claim - I -, characterized in that the ventilation  and brewing can be done by an air blower  and a series of diffusers 6 - Method of constructing a treatment plant according to the  claim - I -, characterized in that the series of  plates (6) constituting the lamellar settling tank can be  fixed instead of removable.  ? - Process for the construction of a wastewater treatment plant  claim -I-, characterized in that the angle of the  plates of the lamellar settling tank can vary between 50 and 90  relative to the horizontal plane