ES2334006B1 - WASTEWATER TREATMENT DEVICE. - Google Patents

Abstract

Water treatment device residual

Device comprising a tank (1), with a wastewater inlet (12) to be treated, and an outlet (13) of treated wastewater, screening means (2) for the solid removal, a sand trap (3) for the extraction of sands, degreasing means, and a blower (4) of air from the contained water, for foaming and foam separation, fat and floating. The tank (1) defines, by means of recirculation, an area of less turbulence (15) of the water in opposition to the entrance (12), being connected in this area of less turbulence (15) an outlet (13), of the wastewater treated, provided with a siphon; being willing in said less turbulence zone (15) degreasing means constituted by auger screw (7) for the extraction of greases, foams and other floating in the surface layer of the water.

Description

Water treatment device residual

Object of the invention

The present invention relates to a sewage treatment device, also known as a "compact plant", in which operations are carried out of screening. sanding and degreasing with floating removal of wastewater before carrying out a process of biological clearance or similar.

Background of the invention

The "plants are currently known compact "consisting of a set of united devices each other to perform a pretreatment or pretreatment of the wastewater that accesses the Water Stations Residuals "E.D.A.R." or to the industries that need the separation of water particles, and which will be submitted after a treatment process, for example of type biological.

The mission of the different parts or devices of the compact plant is to extract and separate from wastewater all possible physical waste before said water Residuals undergo a treatment process.

The successive phases carried out by the plant Compact pretreatment and corresponding to the various devices are carried out in a tank mounted on a frame, with a wastewater inlet to be treated and an outlet of treated wastewater, subjecting in said tank to the adequate cleaning phases, which are: - water screening, where they are filtered waters with screening media or filters of greater or smaller caliber; extracting the solid parts larger than drag the water; - sanded in a sand trap where Decanting the heaviest fine particles, sands and sludges are deposit at the bottom of the tank; and degrease the water, where by means of degreasing means the separation of floating, foams, oils and other substances that weigh specific is less than the specific weight of the water and that deposit on the surface of the tank.

More specifically, in the media of degreased, once these foams and fats are in the surface, are extracted continuously or automated, leaving the water ready for the subsequent purification process.

In general, foams and fats are extracted with the help of air blowers from the bottom of the tank. Once the foams and fats are on the surface, it they extract by means of scrapers. Floats (fats, foams and others) are normally conducted to the entrance side of the waters. There is a ramp for the elevation of fats and separation from the rest of the water and fall by gravity through a tube that Drive abroad.

The first difficulty is that the fats that have been separated by decantation and aided by the blowers of air. to be led to the water inlet side to be taken outside, they find the area of greatest turbulence,  so that part of the separated fats is diluted again in the incoming water

The second difficulty that occurs in degreasing devices already existing in the market is that fats and foams are extracted abroad by means of discharge by gravity. Being oils, foams, textile fibers and others, these tend to stick on the walls of the outlet tube and as they fall by gravity and nobody pushes them they end up obstructing said float evacuation outlet.

All this causes considerable problems of maintenance in compact plants and misuse of facilities, by not supplying sewage sufficiently treated.

In some cases the tank has in its bottom endless extraction of sludge and heavy sediments that are not extracted by the sand trap.

Description of the invention

The water treatment device residuals, object of this invention. present some technical peculiarities aimed at improving the extraction of foams light greases and floats efficiently and avoiding possible jams or maintenance problems.

According to the invention, the device of wastewater treatment, comprises in a known way a tank mounted on a rack, with a water inlet waste to be treated, an outlet of treated wastewater, about screening means for the removal of solids of a certain caliber, a sand trap for the extraction of sand and heavy waste and degreasing means for the extraction of foams, fats and floating pollutants in general, the tank comprising a blower for the injection of air into the water, foaming and separation of foams, greases and floats. Tank device essentially defines, by means of recirculation, an area of less water turbulence in opposition at the entrance of wastewater. In this area of less turbulence It is connected, by means of a siphon, an output of the treated wastewater. In this same area of less turbulence disposed degreasing means are arranged by an endless screw for the extraction of fats, foams and other floating in the surface layer of water.

With this constitution a series of considerable advantages, since on the one hand the extraction of Floating is done in an area of less turbulence and so both the dilution effect of these foams and floats is avoided by movement of water. Optimizing performance I also know ensures that the removal of foams by means of the auger is free of the jams and adhered residues that are usually produced in scraper degreasers with gravity evacuation, where not there are some active means of elimination that complete the spill.

In one embodiment the siphon is constituted by a baffle plate arranged in front of the treated water outlet and partially introduced under the water level, preventing the passage of the foams, greases and floats towards said water outlet treated.

In one embodiment, the recirculation means of water in the tank are made up of a water pump that take the water next to the area of least turbulence and return it in a point upstream of said tank, creating a current water surface, regardless of the entry of water into the tank, and that approximates the foams, greases and floats to the area of Tank outlet more effectively. This pump allows to regulate the speed of advance of the floating ones with total security, although it is not ruled out that said recirculation is carried out naturally through the current produced by the entry and exit of water in the tank.

Description of the figures

To complement the description that is being performing and in order to facilitate the understanding of characteristics of the invention, is attached herein descriptive a set of drawings in which, for illustrative purposes and not limiting, the following has been represented:

- Figure 1 shows an elevation view of the device.

- Figure 2 shows a plan view of the device.

- Figure 3 shows a view from the end of device input.

- Figure 4 shows a view from the end device output

Preferred Embodiment of the Invention

As can be seen in the figures referenced the sewage treatment device, comprising a tank (1) mounted on a frame (11) of support, with an inlet (12) of wastewater to be treated and a output (13) of treated wastewater for a next process Debugging The device presents behind the entrance (12) of water screening means (2) by means of elimination filters solids of a certain caliber that pour water through a hopper tank (1). In the tank (1) there is a sand trap (3) of extraction of sand and heavy solid particles from the bottom of the tank (1) outside.

The tank (1) has its part attached bottom one blower (4) for the formation of air bubbles in the sine of the water contained in said tank (1) with which They form the foams, the floating ones and makes the fat rise. This blower (4) is arranged next to the entrance (12) of water, where there is an area of greater turbulence (14), in opposition to the end of the outlet (13) of treated water, where find an area of less turbulence (15) to stabilize in surface foams, greases and floating, facilitating its extraction.

In turn, the tank (1) presents in its part bottom one pump (5) to cause a recirculation current water surface with foams and floating between the area of greater turbulence (14) and the zone of least turbulence (15), being this pump (5) connected with a mouth next to the exit zone of water and another mouth next to the water inlet area.

In the area of least turbulence (15) find a deflector plate (6) of the foams, arranged partially introduced under water level, as a siphon, and after which is the outlet (13) of treated water from device.

On one side of this baffle plate (6) is find a mouth (16) of foams, fats and floating to a screw (7), motorized for mechanical extraction of said foams, greases and floating out of the device so automatic

In an alternative embodiment the tank (1) it presents in its bottom an endless extraction (8) of all and heavy sediments

Once nature is sufficiently described of the invention, as well as a preferred embodiment, for the appropriate purposes that the materials, form, size and arrangement of the elements described may be modified, as long as this does not imply an alteration of the essential features of the invention claimed in continuation.

Claims (3)

1. Wastewater treatment device, of the type comprising a tank (1) mounted on a frame (11), with an inlet (12) of wastewater to be treated, and an outlet (13) of treated wastewater , and screening means (2) for the removal of solids of a certain caliber, a sand trap (3) for the extraction of sands and heavy residues and degreasing means for the extraction of foams, fats and floating contaminants in general, comprising the tank (1) an air blower (4) of the contained water, for the injection of foaming air and separation of the foams, greases and floats, characterized in that the tank (1) defines, by means of recirculation means, an area of less turbulence (15) of the water in opposition to the entrance (12) of wastewater, being connected in this zone of less turbulence (15) an outlet (13), of the treated wastewater, provided with a siphon; being disposed in said area (15) of less turbulence degreasing means constituted by screw (7) for the extraction of fats, foams and other floating in the surface layer of water. 2. Device according to claim 1, characterized in that the siphon is constituted by a baffle plate (6) arranged in the outlet (13) of treated water and partially introduced under the water level, preventing the passage of fatty and floating foams towards said outlet (13) of treated water. 3. Device according to any of the preceding claims, characterized in that the water recirculation means in the tank are formed by a water pump (5) that takes the water next to the zone of least turbulence (15) and returns it in a point upstream, creating a surface water current, regardless of the current produced by the inlet (12) of water in the tank (1), approaching the foams, greases and floats to the exit zone of the tank (1).