SU941303A1 - Process for purifying natural waters from hydrogen sulfide - Google Patents

Description

(5) - A METHOD FOR CLEANING NATURAL WATER FROM HYDROGEN

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The invention relates to the purification of natural waters, namely to the technology of purification of natural waters from hydrogen sulphide.

A known method of purification of natural water from hydrogen sulfide by filtering hydrogen sulfide water through a layer of granular load, on the surface of which iron hydroxide is deposited lj.

However, this method has not found wide application, since the formation of the sulphurous iron cements the ferrogel and, in addition, there is a significant deterioration in the organoleptic properties of water, causing its need for additional water treatment, which is associated with significant economic costs.

The closest to the proposed method is the purification of natural waters from hydrogen sulphide by filtration through a charge treated with an aqueous solution of manganic acid KLIA 2,

The disadvantages of this method are insufficient purification - up to 98%, significant consumption of potassium permanganate, short duration of the filter cycle.

The purpose of the invention is to increase the degree of purification.

This goal is achieved by

10 that, according to the method of purification of natural waters from hydrogen sulphide, the loading is previously treated with an aqueous solution of ferrous sulphate with a concentration of 20–50 g / l for 30–90 minutes prior to an aqueous solution of potassium permanganate. As a result of this treatment, a film is formed on the charge grains that is active.

20 sorbent hydrogen sulfide. In this case, the lower limits of the concentration of reagents and time are explained by the fact that with a lower concentration and time

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there is no formation of a dense film (sorption) and the removal of hydrogen sulfide is not completely, and the upper limit is dictated by the initial concentration of hydrogen sulfide in natural water and economic considerations,

The method for removing hydrogen sulfide from natural waters is as follows.

The filter loading is first treated with a solution of ferrous iron Fe504 with a concentration of 20-50 g / l for 30-90 minutes, the solution is drained; then it is treated with a solution of KMpOl with a concentration of 1–5 g / l for 30–90 min, after which this solution is also drained into tanks, and the treated water is fed with initial water containing hydrogen sulfide.

Example 1. Groundwater having the following quality indicators:

pH

7J 2.2

Alkalinity, mg / l

Oxidability, mg / l

7 20

Hydrogen sulfide mg / l is passed through the processed, successively FeSO and loading on the filter model 0 100 mm. Zernist loading from quartz sand with a grain size of 0.8-1.6 mm and a height of 1500 mm.

. The loading treatment is carried out by filling the pore space with its upward flow of an aqueous solution of FeSO 20 g / l. The duration of the contacting of the loading with the FeS04 solution is 30 minutes.

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Then the filter model is similarly filled with a 1 g / l KMpOx solution. After that, the water is filtered at a speed of 5 m / h through a loading treated with reagents. As a result, the content of hydrogen sulfide at the outlet is 0.1 mg / l.

Example 2. Similar to underground water exss, the periment is carried out having the following quality indicators:

рН7.2

Alkalinity, mg / l 2.9 Hydrogen sulfide, mg / l 30

5 The load is treated with an aqueous solution of FeS04 with a concentration of 0 g / l for 60 minutes, and then with an aqueous solution of KMnO4 with a concentration of 3 g / l for 60 minutes. Water passed through filtration contains hydrogen sulfide in an amount of 0.1 mg / l.

Example 3. Treated underground water in one of the areas of the Volgograd region. Indicators of water quality 5 VA are as follows:

7, pH 3.6

Alkalinity, kg / l 126 Oxidative capacity Od, mg / l Hydrogen sulfide, mg / l 50 0 The load is treated with an aqueous solution of FeSO 50 g / l, then KMp04 with a concentration of 5 g / l The duration of contact of the quartz sand with the reagent solution is 90 minutes. The concentration of hydrogen sulfide in the filtrate is 0.1 mg / l.

The data of examples 1-3 are shown in the table.

Claims (2)

The use of the proposed method makes it possible to obtain savings of expensive potassium permanganate compared to the known 10 times. The annual economic effect is 75,000 rubles. for water treatment plants with a capacity of 25-30 thousand. Invention Formula The method of purification of natural water from hydrogen sulphide by filtering through a feed treated with an aqueous solution of M or M potassium hydroxide, which differs from the fact that, in order to increase the degree of purification, the batch is treated with a solution of sulfuric acid-iron with a concentration of 20-50 g / l before an aqueous solution of potassium permanganate. within 30-90 minutes Sources of information taken into account in the examination 3 1, Klchko c. A., Apetsin I. E. Purification of natural waters. M., Stroiie dates, 1971, p. k73. 2. Ja (S.N., Eligulashvili S.S. Naumova, N.N. Removal of hydrogen sulfide from natural water when using oxidation catalysts. Technical engineering. I9f |, Jl. Pp. Za-31.