The way to reduce pollution of mine water

 

(57) Abstract:

The invention is intended to reduce pollution of mine water. The purpose of the invention is the reduction of oxidative processes in the mine water by limiting the exposure time to the mine environment on entering the underground mine water. Determine in the mine after receipt of groundwater. Buryats rising drainage wells at an angle of 30 10to the predominant open fracture aquifer. Equip the well casing pipes, hydrosilicate and pressure gauge and is connected to a well pipe, which serves underground water treatment facilities or drains. Sampling of water from the drains is carried out not later than 2 hours from the time of accumulation. 1 C. p. F.-ly.

The invention relates to mining, mainly to the coal industry.

Goal is the reduction of oxidative processes in the mine water by limiting the exposure time to the mine environment on underground water.

There is a method of reducing contamination of mine water by creating a group of drainage for several mines, where the movement path of the mine water has increased, which contributes to the deposition of vesvese mine water prior dewatering through bookmarks wells from underground workings and separate issue of drainage and mine water [2].

The disadvantage of this method is the fact that he does not exclude messages drainage water from the mine atmosphere and soil excavations, and this helps for a short time to increase the mineral component of pollution (decrease in pH, increase in dry residue and so on). The decrease in the movement path of the water is achieved by drilling new wells and construction of new drains and new pumping stations, time-consuming, expensive and requires time.

For many mines characteristic is the presence of Tihonovich bacteria that accelerate the process of accumulation of acid mine water by oxidation of iron disulfide FeS2present in large quantities in the coal and surrounding rocks. Under these conditions, the drainage of water into the soil workings and the mine atmosphere, change in quality, become more saline and acid.

The essence of the proposed technical solution is the transfer of groundwater in insulated piping system and submitting them directly to treatment facilities or drains without contact with soil mining and mine atmosphere.

The method is as follows. Abrazame water in the main water tank mines, make sure that at the moment of entering into the mine underground water had a neutral or slightly alkaline environment (pH 7-9), which is typical, for example, for the Eastern Donbass, and the dry residue is 1-2 g/L. in other words, the quality of groundwater close to (or corresponds to) the standards of potable water.

Make sure that in the main sump mine (WWTP) enters the water, for example, acidic (pH 3.5) and dry matter up to 8 g/L.

Determine the position of the aquifer, where the water inflow into the mine and drill rising drainage boreholes at an angle of 20-40aboutto the predominant open fracture aquifer. Equip boreholes casing and insulating devices, connect hydrazidine and manometer. Spend sequentially measuring the flow rate and determine the operational reserves of groundwater, adjust the position of the valve so that the flow rate was less stocks, warrants, taking into account seasonal fluctuations in resources, protection of aquifers from premature depletion and, thus, stable operation of this intake for a long time with the same quality is ecient To reduce water flow through the borehole is determined by the formula

K=K1HC2where TO1- reduction coefficient resources aquifers in the autumn-winter period (for the Eastern Donbass calculated according to observations, and is 0.89);

TO2- coefficient taking into account the need to replenish stocks depending on the ratio of the bandwidth of the drainage system of this well Q m3/h and operating reserves aquifer Qem3/h .

When the ratio is 1 factor K2may be taken equal to 1.

When the ratio of < 1 K2accepted within 0,9-0,95. The meaning of application of this factor is to reserve 5-10% of the inflow to maintain stocks at a certain, not subject to reduction level.

When steady pressure is applied the greater the ratio.

The capacity of the drainage system can be determined by the known formula:

Q = 4103b , m3/h, where b is the diameter of the pipes of the system, m;

H - height of water column (pressure) in the borehole, m;

L is the length of the borehole, m;

g - acceleration of gravity 9.8 m/c2.

After determining the K-factor and flow control with pomroy atmosphere and soil excavations passed directly to the sewage treatment plant or a water tank. When the mine Tihonovich bacteria water in a short time becomes mine. It was also established that the change of water properties (odor, color, taste, and so on) are changed after 2 h after sampling, so stay isolated groundwater in the sump should be limited to 2 h, after which the effectiveness of the proposed method will be reduced.

At the same time subject to this condition, as experience shows, the efficiency of the method is very high.

The method gives also the possibility to dilute falling into the mine brines, for example, attract netrenirovannykh of fresh water reserves, occurring at shallow depths.

1. The WAY to REDUCE POLLUTION of MINE WATER, including drilling, raise boring of wells in aquifers in the areas of water supply, drainage water from aquifers by wells, the transfer of the mine water from the sources to the drains or sewage treatment plants and reducing the movement path of the mine water for mining, characterized in that to reduce oxidative processes in the mine water by limiting the exposure time to the mine environment coming from aquifers waters which are well hidrosadenitis and pressure gauge and connect the casing with an insulated pipeline which is installed in mines, determine the reserves of the aquifer, compare them with the bandwidth of the system the well - tubing and convey water from rising well insulated pipe into a water tank or treatment plant, wells are drilled at an angle (30 10)oto stretch the prevailing open fracture aquifer and the flow of water set in compliance with the conditions of protection of aquifers from depletion.

2. The method according to p. 1, characterized in that when the flow of water from the aquifer through the pipeline the residence time of ground water in the sump is installed not more than 2 hours

 

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