SK5759Y1 - Device for pre-treatment of waste waters in waste water treatment units - Google Patents

Abstract

Device for pre-treatment of waste waters in waste water plants consists of a lengthwise tank (1) divided in a compact or sectional separating chamber (13) and technological chambers (12, 12') situated at the foreheads (101) of the tank (1), wherein the separating chamber (13) is equipped with at least a feeding channel (2) and a discharge tube (5). The separating chamber (13) contains at least one set of separating jets (4) arranged practically longwise at the bottom (131), wherein the jets (4) are attached to a source of power water and are directed against the flow of waste water to the separation chamber (13). The source of power water consists of pumps (41) that are arranged in the second technological chamber (12'), with suctions running into the discharging part of the separation chamber (13) that can be by means of a lengthwise barrier (14) divided in two mirrored separate functional parts, and wherein is raised a transversal barrier (15) with a overflow rim (151). The bottoms (131) of both of the parts are in the longitudinal direction cut and they are equipped in the lowest part with bottom transporters (3) of which the outgoing part is situated above sand traps (132) built in both parts of the separation chamber (13), adjacent to the first technological chamber (12) in such a way, that their bottom parts are sloped from the technological chamber (12) and are arranged below the level of the bottom (131) of the separation chamber (13).

Description

The technical solution relates to the construction of a device for pre-treatment of waste water in water treatment plants and water treatment plants, which is intended for separation and removal of sand or possibly floating impurities, especially fats, contained in waste water and supplied to tanks. The solution is particularly advantageous for longitudinal rectangular tanks and subsequent technological processes using biological processes based on denitrification and nitrification for wastewater treatment. At the same time it serves to protect the equipment and systems of sewage treatment plants, respectively. water treatment plants, before rubbing substances, clogging with sand sediments or greases.

BACKGROUND OF THE INVENTION

Separation of sand with a grain size above 0.2 mm and possibly also fats in the pre-treatment phase is currently carried out mainly by means of separation systems based on aerated longitudinal traps, where the sedimented sand is subsequently cleaned, for example by pumping it out in the form of a hydromix. a bridge moving over a tank of traps. If the system is designed as a sand and grease trap, flotated grease is wiped off by a leveling squeegee placed on the bridge over the overflow edge, which is drained into a trap of floating dirt. Another variant of the removal of sand is its removal into the sand pit by means of a bottom rake, from where it is then removed, for example, by pumps. Usually, the device operates continuously or cyclically, and the catcher bridge generally moves along the rails as a support for other components. The method used to collect grease and sand, including its purification and removal of carried organic contamination, is outdated and ineffective with regard to further handling of the recovered waste and the loss of carried easily degradable organic matter important for today's known and used enhanced nutrient removal processes. . Another important disadvantage of the air-mixed longitudinal sand and grease traps is the fact that this process results in technologically undesirable oxidation of the waste water, while it is desirable, after passing through these traps, that the subsequent purification process be first anaerobic, i. j. in the absence of air oxygen.

Further, sand traps are known which operate on the principle of vertical sedimentation process, an example of which is the solution according to CZ 2001-2812 A1. The described construction of a circular tank with a central conical bottom deflection and the use of a funnel rake makes it possible to reduce the large construction depth of conventional vertical traps. The solution according to CZ 1993-2574 A1 uses inflow devices with controlled outlet slot and controlled water flow for inflow into the longitudinal flat traps, which results in a reduction of the construction dimensions of the traps. Also known is the device according to CZ 1993-267 A1, in which the characteristics of the rakes and traps are integrated, which carry out the screenings and sand from the bottom of the tank by means of a sorting conveying device. Furthermore, a container solution of sand traps longitudinally mixed with air is known which is described in US 2005/0045546 A1 and which has the disadvantage of oxygenating the purified water, which is disadvantageous for further phases of the cleaning process.

The essence of the technical solution

The aforementioned disadvantages of the known solutions are largely eliminated by a wastewater pre-treatment plant in a sewage treatment plant consisting of a longitudinal tank divided into an integral or longitudinally separated separation chamber and the technological chambers located at the ends of the tank, where the separation chamber is equipped with at least an inlet trough and wherein the arrangement comprises in the separation chamber at least one set of substantially full length bottom disposed nozzles connected to a source of pressurized water and directed substantially upstream into the separation chamber of the incoming wastewater.

In a preferred embodiment, the pressurized water source is formed by conveyor pumps mounted in a second process chamber, the intakes of which are connected to the outflow section of the separation chamber, the separation chamber being divided by a longitudinal bulkhead into two separate functional parts and a transverse bulkhead with overflow edge.

It is also advantageous if the bottoms of the two parts of the separation chamber are chamfered in the longitudinal direction and are equipped with bottom conveyors at their lowest part, the outlet part of which is led above the sand catches built in the separation chamber adjacent the first technology chamber. are considered downstream of this process chamber and are formed below the bottom of the separation chamber.

It is likewise advantageous if each of the parts of the separation chamber is equipped with a grease separator built along the side walls of the tank with a surface conveyor connected to the grease container.

SK 5759 Υ1

Optimally, the grease separators are formed by inserting silent walls interconnected with the separation chambers by means of lamellas forming through-holes in the walls, wherein the end portions of the grease separators are connected to the suction pumps located in the second process chamber and interconnected by displacements to the grease reservoir. located outside its own treatment tank and is designed to drain or balance the collected separated fats.

BRIEF DESCRIPTION OF THE DRAWINGS

A specific embodiment of the invention is schematically illustrated in the attached drawing, where:

Fig. 1 is a vertical section through the device; and FIG. 2 is a plan view of the device of FIG. First

The drawings which illustrate the technical solution and the example of its specific embodiment described below do not in any way limit the scope of protection given in the definition, but merely illustrate the nature of the technical solution.

EXAMPLES

According to the technical solution, the device consists of a longitudinal tank I of rectangular cross-section, preferably made of concrete and built in the ground. The interior of the tank I is divided by two partitions 11, 11 'built near both end walls 101, divided into the extreme dry process chambers 12.12' and the central separation chamber 13, which is divided into two separate functional parts by longitudinal bulkhead 14 and Above one of the end walls 101 of the tank 1, an inlet trough 2 is formed which extends above the separation chamber 13 with two sluices 21, perpendicular to the direction of the waste water inlet. The bottoms 131 of the two parts of the separation chamber 13 are chamfered in the longitudinal direction and are provided at their lowest part with bottom conveyors 3, preferably constituted by shaft-less spindle conveyors, led through a first bar Π to the first process chamber 12 where their bottom 3T drives are located. 131 of the two separation chambers 13 is a set of longitudinally disposed nozzles 4 connected to the mixing conveyor pumps 41, which are located in the second process chamber 12 'and whose suction is connected to the spaces of the separation chambers 13 behind the crossbar 11'. An integral part of the separation chambers 13 are the sand catches 132 built adjacent to the first partition H. such that their bottom portions are considered away from this partition H and are formed below the bottom 131 of the separation chamber 13. Another part of the separation chambers 13 is the grease separators 16 along the side walls 102 of the tank i by inserting the silent walls 161 connected to the separation chambers 13 by the lamellas 162 forming the through slits. Above the grease separator 16 is a surface conveyor 163, preferably formed by a chain scraper. The end portion of the grease separator 16 is connected to the suction pumps 165 located in the second process chamber 12 'by a passage line 164. The displacement of the suction pumps 165 is connected to a grease container 166 located outside the actual treatment tank I and is adapted to pump or balance the collected separated greases. The device is further equipped with conventional standard constructional and technological elements, such as discharge pipes 5, walkways 6 with railing 7, sand pumps 8, preferably mammoths, a series of not shown or unmarked fittings and control, actuating or safety elements or components.

In the purification process, the pre-treated waste water is fed through the inlet trough 2 and, depending on the amount, is impregnated by opening one or both sluices 21 perpendicular to its inlet into one or both parts of the separation chamber 13. Here it is subjected to pressurized water blown by means of the conveying pumps 41 by a system of nozzles 4 directed substantially against the movement of the inflow water. This causes the water to mix and rotate in the direction of the cylinder, causing the sand to separate and fall towards the bottom 131. Here, it is raked by bottom conveyors 3 into the sand catchers 132, from where it is sucked off by sand pumps 8 or otherwise balanced. The de-sanded waste water is then discharged via the overflow edge 151 into the second part of the separation chamber 13, from which it is either discharged through the outflow line 5 for further denitrification or nitrification treatment or pumped by conveyor pumps 41 to the nozzle system 4. the fats also penetrate through the slots 162 between the slats 162 from the separation chamber 13 to the grease separator 16 where they float to the surface and are flushed by a surface conveyor 163 into the end portion of the grease separator 16 adjacent the second process chamber 12 '. intervals pumped into the container 166.

SK 5759 Υ1

The described embodiment is not the only possible construction of the device according to the technical solution, because the bottom conveyor 3 does not have to be solved by a spindle conveyor, the level conveyor 163 does not have to be formed by chain rake, the reservoir 166 can be located more distant from the construction layout of the sewage treatment plant. if it is secured against freezing. Finally, the tank 1 need not have a rectangular cross-section, but it may have a cross-section of the inverted trapezoid and for fat-free waste waters the tanks I need not be equipped with grease separators 16.

Industrial usability

The equipment designed according to the technical solution can be used in water treatment plants or water treatment plants, where it is necessary to ensure separation of sand and fats from the waste water supplied for further processes.

Claims (6)

PROTECTION REQUIREMENTS A wastewater pretreatment device in a sewage treatment plant comprising a longitudinal tank (1) divided into an integral or longitudinally separated separation chamber (13) and technological chambers (12, 12 ') located at the ends (101) of the tank (1), wherein the separation chamber (13) is provided with at least an inlet trough (2) and an outlet conduit (5), characterized in that the separation chamber (13) comprises at least one set substantially along the bottom (131) of arranged separation nozzles (4) ), which are connected to a source of pressurized water and directed substantially upstream of the wastewater inflow separation chamber (13). Apparatus according to claim 1, characterized in that the source of pressurized water is formed by conveying pumps (41) which are mounted in the second process chamber (12 ') and whose intakes are connected to the outlet part of the separation chamber (13). Apparatus according to claims 1 and 2, characterized in that the separation chamber (13) is divided by two longitudinal bulkheads (14) into two mirror-functional separate functional parts and a transverse bulkhead (15) with an overflow edge (151) is built therein. Device according to one of Claims 1 to 3, characterized in that the bottoms (131) of the two parts of the separation chamber (13) are chamfered in the longitudinal direction and are provided with bottom conveyors (3) in the lower part of which extends above the sand catches (132) built in both parts of the separation chamber (13) adjacent to the first process chamber (12) so that their bottom portions are considered downstream of the technology chamber (12) and formed below the bottom (131) a separation chamber (13). Apparatus according to any one of claims 1 to 4, characterized in that each part of the separation chamber (13) is provided with a grease separator (16) built along the side walls (102) of the tank (1) with a surface conveyor (163) connected to a grease reservoir (166). Apparatus according to claim 5, characterized in that the grease separators (16) formed by the insertion of the silent walls (161) are connected to the separation chambers (13) by means of slats (162) forming passage slots in the walls (161), portions of the grease separators (16) are connected to the suction pumps (165) located in the second process chamber (12 ') via the transfer line (164) and interconnected by the discharges to the grease reservoir (166) which is located outside its own treatment tank (1) for pumping or balancing the collected separated fats.