Process of underground disposal of biologically hazardous sewage

FIELD: underground disposal of biologically hazardous sewage.

SUBSTANCE: process of underground disposal of biologically hazardous sewage into geological formations, which do not have distinct aquifiers above the working floor, includes drilling of injection wells and pumping sewage into the working floor. The process is distinguished by sewage pumping into working floor simultaneously with technical fluid injection into a stratum above the working floor. Pressure of technical fluid injection into the buffering floor is sustained at the level of 0.9-1.1 of sewage injection pressure in the working floor.

EFFECT: prevents disposed sewage penetration into higher aquifiers.

2 cl, 2 dwg

 

The invention relates to the field of underground disposal of biohazardous waste water (industrial effluent) of various companies, cleaning and processing are complicated, and discharge into the open waters impossible.

There is a method of disposal of chemically hazardous liquid wastes in geological formations of high-temperature hydrothermal system located in the structure of the andesitic stratovolcano island volcanic arc, which consists in the fact that prepared for the disposal of waste is pumped into the zone of disposal silicate composition, mix in the injection process, with acidic aqueous solutions and preserve them in this area (see RF patent №2001454, G21F 9/24).

The disadvantages of this method primarily include limited scope only in the structure of the andesitic stratovolcano volcanic island arc silicate composition, which are found in nature is extremely rare.

The closest in technical essence and essential features of the claimed method is a method of underground disposal of industrial wastes through injection wells in aquifers, securely isolated from the overlying fresh water impermeable layers of rock (see kN. "Hydrogeological studies for disposal about islennyh wastewater in deep aquifers". M.: Nedra, 1978, p.9-13).

The main disadvantage of this method is the obligatory presence of the working horizon layer of impermeable rock, impeding the flow of injected industrial waste in the overlying aquifers, the water of which can be used for drinking or industrial purposes.

This drawback significantly restricts the use of the method or significantly increase the cost of its application by laying long lengths of pipeline to the area where the hydrogeological conditions of the use of this method are met.

The technical result, which directed the present invention is to prevent the penetration of landfilled waste water in vistanevada aquifers (which can be used for drinking or industrial water supply), when the underground disposal of wastewater in the geological formation, do not have the working horizon distinct impermeable layers.

To obtain the technical result of the proposed method of underground disposal of biohazardous waste water in geological formations that do not have the working horizon distinct impermeable layers, including the drilling of injection wells and injection of wastewater into the working horizon is, in which, according to the invention, simultaneously with the injection of wastewater into the working horizon download technical fluid in the horizon, occurring over a working horizon, the pressure on the bottom of injection wells for injection of the fluid in the upper horizon, support equal to 0,9-1,1 pressure on the bottom of injection wells for injection of wastewater into the working horizon.

It is advisable as a technical fluid to use a liquid with high viscosity, for example, diluted mud.

Pumping in the horizon, occurring over a working horizon, technical fluid in it create a "buffer horizon", it is reasonable power (high) buffer horizon to maintain (create) in the range of 0.1-0.25 from the power of the working horizon.

The pressure of injection of the fluid on the bottom of injection wells drilled in the buffer horizon, support equal to 0,9-1,1 discharge pressure at the bottom hole injection wells used for the injection of wastewater - industrial wastewater into the working horizon.

This condition is essential. As if the pressure in the buffer horizon will be more than 1.1 pressure in the operating horizon, the portion of the fluid will flow into the working horizon. If the pressure in the buffer horizon is less than 0.9 pressure in the working horizon, part of the wastewater - industrial wastewater will begin to flow into the buffer horizon.

The creation of buffer horizon of small capacity and the use of technical liquids with high viscosity contribute to a substantial decrease in the consumption of the fluid and increase the insulating properties of the buffer horizon.

The increase in the viscosity of the fluid 1.2-1.5 times compared to the viscosity of the discharge allows not only to reduce the flow rate of the fluid at the required pressure ratio in the working buffer and the horizon, but prevents flow of the fluid from the buffer horizon in adjacent horizons. Moreover, the permeability of rocks in the vertical direction is always significantly lower than the permeability in the horizontal direction. The increase in the viscosity of the fluid more than 1.2-1.5 times impractical, as it would lead to large hydraulic losses and the need to maintain a high pressure on the mouth of the injection wells.

In accordance with the laws of underground hydrodynamics for injection into the aquifer fluid pressure drop ΔR above the reservoir at any point in the reservoir at a distance r from the injection well at any time t is determined by the formula

where Q is the flow rate of secutive the second liquid;

K, h - permeability and the thickness (height) of the horizon, respectively;

χ - coefficient of piezoconductivity of the horizon;

μ the viscosity of the injected fluid.

To avoid overflow of injected industrial waste in the overlying aquifers requires observance of the equality of excess pressure in the working horizon ΔPpthat loaded industrial wastewater with a flow rate Q, and the buffer horizon ϕ·ΔPbthat pumped technical fluid with a flow rate of q, i.e. the

From the equality (2), taking into account formulas (1) to determine the flow rate of injection into the buffer horizon technical liquids q

where the parameters of the working horizon has index p, and the buffer horizon - index b.

μpthat μtthe viscosity of the injected industrial waste and the viscosity of the fluid.

Since the coefficients piezoconductivity of aquifers, as a rule, vary little in their values, and the distance r, which is determined by the differential pressure are equal, the ratio of the logarithm in the formula (3) can be neglected and equation (3) will be

where Q is the flow rate of industrial wastewater;

Tophp. - the permeability and the power p is working horizon;

μpthe viscosity of industrial wastewater;

Tobhb- the permeability and the capacity of the buffer of the horizon;

μ the viscosity of the fluid;

ϕ - the ratio of the pressures in the working and buffer horizons, 0.9 and 1.1.

Figure 1. shows the disposal of biohazardous waste water and industrial effluents by the proposed method.

Figure 2. shows the disposal of biohazardous waste water and industrial effluents on the proposed method for the case when the working horizon is limited in size and to prevent a sharp increase in the discharge pressure are a relief well, which are located outside the estimated front for the promotion of industrial effluents on the working horizon. Cm. for example, kN. Rybalchenko A.I., Pimenov, M.K. and other Deep disposal of liquid radioactive waste. - M, November 1994, s-153.

In the drawings indicated:

1. Working horizon.

2. Injection well injection discharge.

3. A pump for pumping the wastewater.

4. Injection wells for pumping the fluid.

5. Aquifer (buffer horizon), occurring over a working horizon.

6. A pump for pumping the fluid.

7. Unloading the well.

Disposal of biohazardous waste water - industrial the runoff on the proposed method is as follows.

In the working horizon 1 via the injection well 2 by means of pump 3 is the injection of industrial wastewater with a flow rate Q.

At the same time through the hole 4 drilled in the buffer horizon 5 by pump 6 is pumping the fluid from the calculated total flow rate q at which the discharge pressure in the working and buffer layers are equal to each other.

As the fluid is water from surface water using a thickener, such as mud.

The implementation of the method, when the working horizon is limited in size and to prevent a sharp increase in the discharge pressure are a relief well, is in a similar way, only in this case, as the fluid used produced water coming from the discharge of the wells 7.

An example of the method.

For underground disposal of industrial waste the operating horizon, with a capacity of 50 m, the permeability -1·10-12m2. The injection of industrial waste waters having a dynamic viscosity of 10-3PA·sec, it is planned to produce with a flow rate of 1000 m3/day (0,012 m3/sec).

As a buffer horizon selected aquifer capacity of hb=10 m, occurring over a working horizon. Prony is aImost buffer horizon To b=0,5·10-12m2. As the fluid is used fresh water from an open reservoir, to increase viscosity to μt=2,5·10-3PA·s used additive mud, ϕ taken equal to 1.0.

The flow rate of injection into the buffer horizon technical liquids defined by the formula (4). Substituting in it the original values, we get q=40 m3/day. Thus, when implementing the proposed method is ensured by the condition of equal pressure at any point in the buffer horizon - pressure at the same distance in the operating horizon.

The consumption of injection of the fluid can be much less than the consumption of industrial wastewater injected into the working horizon, which contributes to the improvement of the economic efficiency of the method.

It is important to note that the use of the proposed method will significantly expand the scope of underground disposal of biologically hazardous wastewater - industrial wastewater, even in those areas where impermeable layers of rocks are not clearly traced.

1. The way underground disposal of biohazardous waste water in geological formations that do not have the working horizon distinct impermeable layers, including the drilling of injection wells and injection of wastewater in the horizon, characterized in that simultaneously with the injection of wastewater into the working horizon download technical fluid in the horizon, occurring over a working horizon, the pressure at the bottom hole injection wells for injection of the fluid in the upper horizon support of 0.9 - 1.1 pressure on the bottom of injection wells for injection of wastewater into the working horizon.

2. The method according to claim 1, characterized in that the fluid used is a liquid with high viscosity, for example, diluted mud.



 

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