DE4110687A1 - Treatment of liq. contaminated with hazardous substances - by mixing with an oxidising agent in cylindrical tube and exposing to UV light - Google Patents

Abstract

Liq contaminated with hazardous substances eg halogen hydrocarbons, bacteria etc, is treated by mixing the liq with an oxidising agent in a cylindrical tube (6), into the top of which the liq is introduced (7), while the oxidising agent is injected (11) at the bottom of the tube, so that the liq is mixed with the liq or gaseous oxidising agent while being exposed to UV radiation from a radiator coil (5). Gaseous oxidising agent is produced by UV radiation of 02 or air in a jacket (3) surrounding the tube, forming 03. ADVANTAGE - High output capacity at reduced cost.

Description

The invention relates to a method for treating pollutants contaminated liquids and an apparatus for its passage guide.

The solution according to the invention preferably takes place in the context of Process engineering for splitting hydrocarbons, esp special halogenated hydrocarbons, but also for Vernich treatment of bacteria, germs, fungi and algae in liquids Application.

It is known to be linked by high energy UV radiation with a simultaneous oxidation of the pollutants different chemical-physical effects are achieved, which are harmful cause substance disposal.

A well-known process in drinking water treatment tion is the PEROX-PURE process, which uses UV absorption the chemical structure of the pollutants is changed or be made reactive to chemical oxidants. At the same time, the metered-in H2O2 is absorbed by UV radiation Hydorxyl radicals converted. By reacting with this strong Oxidants will destroy the pollutants or something changed that they z. B. a biological further treatment are accessible. (Brochure from NORDDEUTSCHEN SEEKABELWERKE AG, NSW Umwelttechnik "PEROX-PURE process").

In recent years, UV light has been used to disinfect drinking water increasing attention (Gelzhäuser, P .; "Disinfection of drinking water by UV radiation ", Expert Verlag, Sindelfingen, 1985 / Scherb, K .; -Disinfection of biologically pre-treated wastewater by UV irradiation, water management, issue 74, p.389, 1984). His applications are still relatively little known and researched waste water treatment. The application of UV radiation is particularly useful when toxic organic substances Degradation of the organic mixture impair or prevent other.

The goal of UV light application is not only the complete one Mineralization of toxic and biological not or only with difficulty degradable organic substances, but also if necessary converting them into less toxic and biologically available Substances.

It is also known (Hager, D.R .; Loven, C.R .; Riggy, C.L .; "Removal of organic water constituents from groundwater through oxidative degradation, HMCRJ conference material; Washington, D.C .; November 1987), organic water constituents from groundwater through oxidative degradation using PEROX-PURE processing plants remove.

By using UV / H2O2 technology, the water can be treated rides that the pollutants in the discharge of the UV / H2O2 system are no longer detectable.

These plants are designed to vary pollutant concentrations their organic solvents to below the detection limit dismantle. These systems are state of the art and the results of the tests confirm the economic chemical oxidation process for removal orga niche pollutants from groundwater and industrial waste water.  

Prerequisite for the safe dismantling of dangerous and Toxic water ingredients is the exact knowledge of Process control, the water chemical aspects as well as the plants construction.

Various UV irradiation devices are described for this purpose (Thielmann, W .; Bandemer, Th .; "Combination of UV radiation and hydrogen peroxide additive to eliminate organic Substances from raw water, DVRW series water No. 107, S. 130/131, Eschborn, 1988). An apparatus consists of one Low-pressure mercury lamp in a quartz glass dip tube, the is located in the center of a cylindrical reaction vessel. A magnet is used for thorough mixing during the irradiation stirrer used. Different sizes can be used in this system Reach UV doses through different exposure times.

Another apparatus is a conventional UV disinfection device Here, too, the UV radiation takes place through mercury Low-pressure radiators, which are arranged radially around a glass tube, through which water flows. By varying the water flow different sizes of UV cans can be applied.

In another apparatus, a circulation pump is used closed water cycle realized. The water can do that be pumped through the irradiation room for any length of time. The UV Spotlights are both radially around the glass tube and zen arranged within the pipe to ensure the best possible To achieve irradiation of relatively thin water layers.

Furthermore, according to DD-PS 2 66 965, Int.C1. A 61 L-2/10, also Known the UV lamp as a substantially a cylin form coiled tube forming the outer surface area, the the tube through which the medium to be irradiated flows. Next it is known from the same patent, the wendel shaped UV lamp around the flowed tube with a UV impermeable housing.

The common disadvantage of all known technical solutions However, lies in the fact that through the respective litigation and appropriate design of the equipment a Ver Soiling of the reaction vessels takes place, which has the consequence that the emission of UV radiation with increasing process time gemin is changed and in turn a deterioration in effectiveness of the operated systems. Another essential one The disadvantage of the known prior art is the relative agile periodic cleaning of the reaction vessels.

The invention is based, a method and a task to implement this method to create an apparatus Improve availability and increase performance ability of plants to treat contaminated rivers liquids, while reducing the effort for the Operation enables.

This object is achieved by the characterizing Part of the measures or means described solved.

The invention is intended to be described below with reference to a drawing are explained by way of example.

Show it:

Fig. 1 a longitudinal section through the apparatus,

Fig. 2 cross section through the apparatus.

The entire apparatus shown in the drawing, which is arranged vertically, consists essentially of a UV lamp module and an injector module. The first-mentioned module in turn consists of a cylindrical tube made of quartz glass 6 with an inlet flange 7 in which the reaction chamber 9 is located. Around this cylindrical tube is a discharge vessel designed as a filament of a UV low-pressure filament lamp 5 angeord net. This arrangement is of a cylindrical casing 4 , with a first inlet connector 8 , a connecting socket 16 and two bushings 12 ; 12 'for the UV lamp so enclosed that they form a gas-tight jacket space 3 together with the cylindrical tube made of quartz glass 6 .

The casing 4 in turn consists of two aluminum half-shells, which by means of two cone flanges 13 ; 13 'with the help of H-profile seals 14 ; 14 'and four with the cone flanges 13 ; 13 'connected symmetrically arranged tie rod connections gene 17 is assembled.

The UV lamp module described is at its lower end with an injector module, consisting of an outlet T-piece 15 with outlet flange 2 , injector body holder 1 with injector body 11 and an inlet port 8 'which in turn with an inlet connection 19 for liquid Oxidizing agent with this check valve 18 'is connected, gekop pelt. The injector body 11 itself consists of open-pore foam glass with a pore size of 30 μm and a pore volume of 70% and was designed as a cylinder.

The liquid to be treated is fed from above via the inlet 7 to the vertically arranged apparatus and the oxidizing agent is introduced in the countercurrent principle from below through the injector via the injector module.

The liquid to be treated is intensely gaseous gene and / or liquid oxidizing agents mixed and the same subjected to UV radiation at an early stage.

The products resulting from the reaction can thereby up to complete mineralization.

The necessary dwell times for the dismantling and thus the through Flow power is determined by the power of the UV lamp, the amount and distribution of the oxidation agent supplied by the injector tel and its thermodynamic properties (pressure, tempera structure, concentration).

The gaseous oxidizing agent is generated by UV radiation of oxygen or air before it is supplied to the liquid to be treated. In this case, the air or oxygen is introduced into the intermediate space 3 via the first inlet pipe 8 . These media are exposed to UV radiation, forming ozone, which is supplied as an oxidizing agent via a pipe or pressure hose connection and the injector module of the liquid to be treated. At the same time, this procedure cools the UV lamp.

There are two operations to perform the described method types possible, the continuous (flow) operation and the discontinuous (batch) operation.

The modular structure of the apparatus is also more advantageous Way according to the respective application by the appendix expandable with additional modules. For example this enables the construction of compact systems.

The solution according to the invention has the advantage that none or only little contamination occurs in the reaction space and also the Cleaning effort is relatively low, that is, the facility works very service-friendly in the company.  

Other advantages are:

• - effective use of energy
• - Low energy costs per unit, with an increase in Mining performance
• - Obtaining the oxidizing agent ozone when cooling the UV lamp.

List of the reference numerals used

1 injector body holder
2 outlet flange
3 coat space
4 sheathing
5 UV low-pressure turning lamps
6 quartz glass cylinders
7 inlet flange
8 first inlet connection
8 ′ second inlet connection
9 reaction space
10 connection
11 injector body
12 first implementation
12 ′ second implementation
13 first cone flange
13 ′ second cone flange
14 first H-profile seal
14 ' second H-profile seal
15 outlet tee
16 connecting pieces
17 tie rod connection
18 first check valve
18 ′ second check valve
19 inlet connection

Claims (6)

1. A method for the treatment of contaminated liquids, in which the liquid to be treated is mixed with gaseous or liquid oxidizing agents and is subjected to a UV treatment, characterized in that the gaseous oxidizing agent is generated by ozonation of oxygen before it is supplied to the liquid to be treated is and then in a vertically arranged vascular system or this in verti cal direction from top to bottom flowing to be treated delan liquid is fed from below in the countercurrent principle. 2. Device for carrying out the method according to claim 1, with a flow-through of the liquid to be treated, a cylindrical vessel made of quartz glass as a reaction space, around which a helical discharge vessel, which emits the UV radiation, is arranged and a gas-tight surrounding , Protective against UV radiation, cylindrical casing which, together with the cylindrical quartz glass vessel, forms a jacket space in which the helical discharge vessel emitting the UV radiation is located, characterized in that the cylindrical vessel ( 6 ) is made of Quartz glass, which is enclosed by the discharge vessel emitting the UV radiation of a UV low-pressure filament lamp ( 5 ), at its lower end with an injection module consisting of an outlet T-piece ( 15 ) with a side-mounted outlet flange ( 2 ), an injector support (1) with a Injektork body (11) and a second input port (8), in turn, with an ingress port (19) in which a second check valve (18 ') is coupled is, for its part, through the second input port (8') and a connecting piece ( 16 ) on the gas-tight casing ( 4 ) by means of a connection ( 10 ), with a first check valve ( 18 ) located therein, is connected to the casing interspace ( 3 ). 3. Apparatus according to claim 2, characterized in that the casing ( 4 ) consists of two half-shells of the same size made of aluminum, wherein on one half-shell a connec tion spigot ( 16 ) and a first inlet spigot ( 8 ) and on the other half-shell a first and second implementation ( 12 ; 12 ') is attached. 4. Apparatus according to claim 2 and 3, characterized in that the casing consisting of two half-shells ( 4 ) by means of a first and second cone flange ( 13 ; 13 ') and connected to them symmetrically arranged tie rod connections ( 17 ), with the aid of a first and second, the half-shell ends connecting in the longitudinal direction, H-profile seal ( 14 ; 14 ') is non-positively joined. 5. The device according to claim 2, characterized in that the injector body ( 11 ) is designed as a disc or cylinder made of open-pore foam glass. 6. The device according to claim 5, characterized in that the pore size 0.5 to 200 microns and the pore volume up to max. 70% of the total volume of the injector body ( 11 ).