DD138564B1 - PROCESS FOR THE RESTORATION OF POLLUTED GROUNDWATER - Google Patents

Description

Procedures зиг remediation vsrunroini <ten

Віз Brfindung envisages a process for the partial remediation of contaminated groundwater by compacting pure groundwater into probes to increase the level of groundwater.

In the fight against large-scale G-run dw as serverunrsinigungen, in particular by mineral oil, it is possible to pump out the bulk of the infiltrated pollutant systematically and clean up the contaminated territory su.

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A known process is limited to pumping off the specifically lighter pollutants, in particular mineral oil, which float as the liquid phase but your groundwater level, the amount of adsorptively bound remaining in the soil, which, depending on the soil structure, is as follows / 3 of the infiltrated pollutant amount may not be taken into account.

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Bas goal of the invention is to eliminate the deficiencies described above, ie to reduce the remaining in the soil adsorptively bound Hestgehalt of pollutants during Burchführung the control measures so far that these pollutants are contained only in dissolved Porm in groundwater, a 3 ¹ Preventing UeB movement of the impurity front and accelerating the microorganism-driven process of remediation ".

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207593

Explanation: the essence of the invention

In the inventive solution of the problem it was assumed that the infiltration of water by means of swallow wells is the reverse process of water intake by means of wells. While the pumping of groundwater from a particular well produces a descending cone, when using the same well for infiltration, an infiltration cone is formed in opposite directions. According to the invention, a certain number of pumping wells are first arranged in a row within the boundaries of the running impurity front, transversely to the direction of movement of the pollutants, from which groundwater for producing the required lowering hopper and the pollutants are pumped off in a known manner.

The pumped-off groundwater is infiltrated into a series of injection wells erected in front of the pollution front or in compression probes according to DD-WP 124 822. In order to avoid silting wells or grouting probes a sand trap is provided in the corresponding connecting piping.

As soon as most of the pollutants located in the catchment area of the pump-out wells have been pumped out, the pumping units can now be successively converted into a second pump-down well row already established during the pumping operation within the contaminant area.

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207598

The pumped-off groundwater from the second pump-down well row is first infiltrated into the injection wells or injection probes built upstream of the pollution front.

After a certain period of operation of the second Abpumpbrunnenreihe the pumped groundwater is now passed into the first Abpumpbrunnenreihe and also infiltrated, d. H. the wells previously used for pumping are now swallowing wells.

Once again most of the located in the catchment area of the second Abpumpbrunnenreihe pollutants is pumped, the pump units can be successively implemented in an already established third Abpumpbrunnenreihe, the pumped groundwater is first passed into the wells of the first Abpumpbrunnenreihe and later in the second Abpumpbrunnenreihe ·

With this arrangement of! Sequence of implementation of the pump units, or infiltration ensures that the remaining after pumping in the soil residual pollutants and contaminated with pollutants soil layers in the groundwater surface are always flushed in the sighting of the currently operating in Abpumpbrunnen ,

The pumping units can be transferred to further pumping well rows until the entire contaminated territory is detected.

Depending on the intensity of the contamination or according to the course of the impurity front, the order of conversion of the pumping units can be varied as desired.

207598

In the construction of the fountain rows, d. ft, the pumping well or "swallow well", the condition is that the locations and distances of the Sinselbrunnen be chosen so that the radii of the lowering funnels, bsw. The infiltration cone of mutually adjacent wells overlap each other. In idealized condition, d. H. in the case of homogeneous geological and hydrological conditions within the contaminated territory, as well as the same production and infiltration capacities of the wells, the locations of each of the three well groups form an equilateral triangle. "In the case of inhomogeneous geological and hydrological conditions, the parameters of the wells must be changed so that the condition mentioned above is observed ,

In the o. G. Arrangement of the well sites results in the advantage that after the implementation of the pumping units approximately the same Hohrleitungslängen be laid with respect to the method according to DD-WP 124 822 smaller inner diameters.

By installing appropriate equipment of measurement and control technology, the pump operation can be largely automated.

In the case of shallow groundwater levels and the use of tubular steel wells, it is still possible to remove wells that are no longer needed and to reuse them.

Ausführungsbei game

The invention is explained in more detail below using an exemplary embodiment:

207598

In the accompanying drawings are shown:? Ig. 1: sectional view of a fountain group

Fig. 2: Example of some possible locations of the wells

In Pig. 1 is a fountain group consisting of three wells, shown in section. From the pumping wells 1, consisting of the gravel bed 2, the Rohwassersteigrohrleitung 3> the pollutant riser 4- and the telescopic pollutant suction pipe 5 a Absenlmngstrichter level 6 is generated by means of a submersible motor pump at the bottom of the well.

The size of the lowering funnel of the pumpdown well is determined by the radius 7.

The accumulating in the lowering funnel of the well 1 pollutants are transported in the P.ohrleitung 8 to the destination.

The pumped groundwater is first passed into the connecting pipe 9> with the sand trap 10 and downpipe 11 in the wells 12 with the Eiesschüttung 13.

It forms the infiltration cone with the level and the radius 15. The arrow 16 represents the direction of movement of the impurity front 18, the level 17 represents the groundwater level before commissioning the wells.

After, the pumping off of most of the pollutants located within the reach of the well 1, the lines are 3> 4-, 5 implemented including the located at the bottom of the well 1 TJnterwassermotorpumpe in the pumping wells 23.

207598

After commissioning of the pumping well 23, a lowering funnel with the level 19 is formed.

The pumped groundwater is first through the connecting pipes 20 and 9 and downpipe 11 in ..

the sump wells 12, the pollutants in pipeline 8 passed.

After a certain period of operation now the pumped groundwater is passed into the former Abpumpbrunnen 1, with a lowering cone forms with the level.

In FIG. 2, examples of some possible well locations in the area of the contaminant front 18 as well as in the case of idealized hydrological and geological conditions circular subsidence funnels or infiltration cones and connecting pipelines are shown.

By means of the reserve connection pipes 22, the combination possibilities between pumping wells and sink wells can be additionally increased, so that it can be ensured in each case that the flushing of the contaminated soil always takes place in the direction of the pumping wells.

By means of the reserve connection pipes 22 it is also possible to realize a combination of the wells among each other according to DD-WP ·

Claims (2)

Zrfindun ^ sanSpruch Te г drive to ѣеіі / лэізеп remediation contaminated 3-round лаззегз by "extorting pure groundwater in probes to the Anne of the G-round viaduct level, characterized in that within the 3-renzen of a running pollution s fro nt, your Direction of movement of the pollutants by means of Abpuapbrunnen the first row (1) G-round ѵazzag in a front of the pollution front row of wells (12) infiltrated 7 ird, then the pollutants are pumped out, the npaggregate succession vjMhrend the pumping operation within іл pollution area built Abpuapbrunnen Next, infiltrate into the aquarium fountains of the first row of thrones (1) 7, then collect the pollutants from the second row (23) sppunic fountains (23) and then experience them η food continued in impurities - 7ird. hieraŭ 2 pages drawings