SU850597A1 - Unit for car-washing waste water purification - Google Patents

Description

I

The invention relates to devices for the treatment of wastewater containing suspended solids and petroleum products and can be used for the treatment of wastewater from car washing.

A known auto installation for wastewater treatment; from a car wash, which includes a preparation and dosing unit for reagents, a reservoir for receiving waste water, a reservoir for land and sand separation, flotation units and a reservoir of purified water ij.

The disadvantages of the known installation are low degree of purification, complexity of operation (preparation and dispensing of reagents), the need for a large number of reagents, which lead to secondary contamination. Purified water after installation has an elevated pH (can cause corrosion), so before re-use it needs additional treatment to adjust the pH value.

Closest to the proposed technical essence and the achieved result is the installation of ds sewage treatment plant containing suspended solids and oil products, including a washing rack, a filter unit with a filtering load, a water intake chamber, an oil collection tank. In quality, filler in wood chips 2.

The disadvantages of the known installation

IS is a low cleaning effect, cumbersome structures, large construction costs, design complexity and the need for frequent filter regeneration,

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The purpose of the invention is to increase the efficiency of use by increasing the degree of purification and reducing the processing time. 3 The goal is achieved by the fact that the installation for cleaning waste water from washing cars, including a washing trestle, a filter unit, a water intake chamber, discharged G1 follower, and an oil collection tank, are equipped with a prefabricated inclined assembly in front of the filter unit , as a seed catcher, a device for removing precipitating and floating substances, consisting of a flotation chamber of a flotation cell in a thin layer of water | and chambers of the clarified liquid, as well as a sludge dewatering unit connected to a cushion trap, flotation chambers and a clarified liquid. The filtering load in the filter unit is made of polyurethane foam waste. The drawing shows the scheme of the proposed installation. The installation includes a follower-mounted washing rack 1, an inclined tray 2 for collecting the liquid of the gas sealer 3, a device 4 for removing sedimentation and pop-up substances consisting of a flotation chamber 5, a flotation chamber 6 in a thin layer of water, and a illuminated chamber 7, block 8 filters with loading from waste polyurethane foam and a water intake chamber 9 for cleaning the purified liquid. A tank 10 is connected to the flotation chamber 5 by means of a pipeline for collecting small quantities. In the installation there is a sludge dewatering unit consisting of a pump. A 1 and a filter press 12 and connected by pipelines to a heat sink, the lower part of the flotation chamber 5 and the chamber 6 with clarified liquid. After the water intake chamber 9, a pressure tank 13 is installed to obtain a water-air mixture connected with a flotation chamber 5 by a pipeline. The installation works as follows. After washing cars, the wastewater is collected by inclined tray 2 and discharged into a cushion trap 3, where the most abundant fractions of suspended suspended substances are retained. The liquid cleared of coarse suspension enters the device 4. In chamber 5, the suspended matter is removed by means of gravity due to gravity forces and to the surface layer of floating suspended substances having a specific gravity of less than one. The removal of suspended substances having a specific gravity close to unity, mainly emulsified oil products, is intensified in chamber 5 due to their flotation by air bubbles released from the liquid solution obtained in the pressure tank 13 at a pressure of 3-5 at. While reducing pressure; neither in chamber 5 until atmospheric. For this, part of the purified water from the water intake chamber 9 is supplied to saturate the air into the pressure tank 13, where air is also fed through the pump suction nozzle. From the pressure tank 13, the air flowed into the air enters device 4, where flotation of contaminants takes place in the surface layer of chamber 5 and in chamber 6 deposition in a thin layer. In the lower part of chamber 7 there is an accumulation of sediment, which slips along the shelves of chamber 6, and the liquid purified from small fractions of sedimentation and floating substances in the upper part. Next, the liquid passes a thin oh, cleaning on the block of 8 filters. The purified water is collected in a water intake chamber 9, from where it is supplied to a consumer for reuse. The sediment accumulated in the petrol bath 3 and into the chamber 5 and 7 of the device 4 is periodically fed to the filter press 12 by pump 11. The dehydrated residue with a moisture content of 40-45% has a small volume, is easily stored and transported. Oil products accumulated in the surface layer of the chamber -5 are scooped into the tray using a special scraper mechanism and diverted from there to the tank 10 to collect oil. The use of polyurethane foam loading in filters makes it possible to significantly simplify the regeneration process. Regeneration of filters with polyurethane foam loading is carried out without the use of any water solutions. It is carried out by spin loading. For this, the filter cassettes are removed from the sockets of the filter unit 8 by means of a crane, mounted above the reservoir 10 for collecting oil and compressing the load with the aid of a push-plate. The oil products are separated from the load and drained directly into the tank 10.

The proposed unit, in comparison with the known, provides a high degree of purification by 2-3 times, a reduction in capital and operating costs by 1.5-2 times, and also eliminates the use of wash water during regeneration.

Claims (2)

Invention Formula 1 An installation for cleaning waste water from a car wash containing a washing rack, a filter unit with a phytotruck loading, a water intake chamber, and an oil recovery tank, which, in order to increase the efficiency by increasing the degree of purification and shortening the treatment time, it equipped with a sequential, but installed / in front of the filter block, an inclined collecting tray, a frosting device, a device for removing floating and settling suspended substances, consisting of a flotation chamber, a flotation chamber in a thin layer T of the chamber of the clarified liquid, as well as by a sludge dewatering unit connected to a cushion, flotation cells and a clarified liquid. 2. Installation according to claim 1, characterized in that the filter loading of the filter unit is made of polyurethane foam waste. Sources of information taken into account in the examination I. For France of France No. 2211404, cl. C 02 C 1/26, 1974. .2. Wastewater treatment plant dp from car washes with flow rates up to 3.0 l / s. Typical project. M., Giproavtotrans, 1973. U / X // y // y / x VAv / l ovv hNvx y // N / x y,) .. y /, c.vA g