SU1368846A1 - Method of cleaning underground waters - Google Patents

Abstract

The invention relates to methods of groundwater purification and can be used in the technology of purification of natural waters, namely, in the purification of groundwater from iron and manganese. hydrogen sulfide, carbon dioxide, methane and petroleum products. The aim of the invention is to increase the degree of purification from methane and carbon dioxide while maintaining a high degree of purification from iron, manganese, hydrogen sulfide and petroleum products. The essence of the invention is that in the method of purification of groundwater, including degassing, oxidation and alkalinization, followed by filtration, decontamination and treatment of the formation of sediment by sedimentation, compaction and dewatering, degassing is carried out by vacuuming. Ejectornom using as a working fluid a solution of sodium chloride with a concentration of 3-5 g mol / l. The gases released during the ejection are separated from the working fluid, which is recycled, and the gases are passed through an alkali solution, followed by calcining the precipitate and using it for alkalis before filtering. 2 tab. with (L with O5 00 00 4 Od

Description

The invention relates to methods for the purification of groundwater, in particular, to methods for purifying groundwater from iron, manganese, hydrogen sulfide, carbonic acid, methane and petroleum products.

The aim of the invention is to increase the degree of purification from methane and carbon dioxide while maintaining a high degree of purification from iron, manganese, hydrogen sulfur and petroleum products.

The method is carried out as follows.

Source water from the well submersible

electrolytic sodium hypochlorite is used to electrolyze it. The sediments resulting from the purification of groundwater are treated as follows. The precipitates retained in the clarifying filter, Fe (OH) j, Mn (OH), are fed to a settling tank for settling. After settling, the heaviest (S) from the bottom of the settler are withdrawn into one seal and the precipitates Fe (OH) j and Mn {OH) j go into the other seal. The clarified water from the clarifier is fed to a clarifying filter for cleaning.

thirty

35

the pump is fed to a vacuum degasser, 15 Wash water from the sorption filter - degassed water by means of a pump. They are passed to a brightening filter. On the illuminating filter, iron hydroxide Fe (OH) 3 Mn (OH) ZI S is retained, the clarified water is further subjected to oxidation with sodium hypochlorite before entering the sorption filter. The oxidized oil products are retained in the sorption filter and after it, the purified water enters the clean water tank, from which the pump supplies the consumer m. The exhaust gases in the degasser, i.e. carbon dioxide and methane are entrapped by an ejector, the working fluid of which is highly mineralized water (solution of sodium chloride with a concentration of 3-5 g mol / l), and separated from it by spraying with an injector into an intermediate tank. Highly mineralized water through the pump again served in the ejector and the loop is closed. Gases separated from saline water are fed to a tank in which the calcium hydroxide solution is located. The latter is prepared in advance in a special tank for alkalizing water. Carbon dioxide, reacting with an alkali solution (calcium hydroxide), forms a precipitate, and methane is separated and, after drying, in a desiccant is fed to a gasholder for subsequent utilization. The precipitate is pumped into the kiln. The resulting carbon dioxide is burned as a result of firing, and CaO is sent to a mixer, where it is used to alkalize the treated water before filtering. A solution of sodium chloride is prepared in a special tank, and for the time after clarification in the settling tank, it is fed to the filter for further purification. The condensed precipitates from the seals are sent to a vacuum filter for dehydration. ready-made raw materials for the preparation of ocher paint, sulfur — raw material for the manufacture of decorative plates, and the sludge of oil products — for fertilizer.

The use of a solution of sodium chloride with a concentration of 3-5 g mol / l as the working fluid of the ejector contributes to an increase in the degree of degassing due to a change in the depth of vacuum in the degasser.

The effect of water salinity on the change in vacuum at the velocity of water in the ejector nozzle 11.4 m / s is shown in Table 1.

With a salinity of up to 3 g mol / l, the efficiency of degassing increases slightly, and with the mineralization of Bbmje 5 g mol / l, an increase in the consumption of salinity does not increase the degree of degassing

Example, According to this technology, the source water is treated in a degasser of about / 100 mm, loaded with rings of rigid PVC pipes of 881.5 mm in size under vacuum of 5-10 Pa with a water irrigation density of 50 m. The oxidation is carried out with sodium hypochlorite, the consumption of which per mg of Fe is 0.5 mg; on

40

50

1 mg MP

1.35, for 1 mg of petroleum products 3 mg. The lime consumption for alkalizing is 60 mg / l. In this case, the treated water is passed eg through a brightening filter loaded with quartz sand with a particle size of 1.2–2.0 mm with 1.7–1.8 mm; the coefficient of heterogeneity of 2.5; 1.5 m high, as well as through the use of sodium hypochlorite sorption from it, an electrolyzer is used. The sediments resulting from the purification of groundwater are treated as follows. The precipitates retained in the clarifying filter, Fe (OH) j, Mn (OH), are fed to a settling tank for settling. After settling, the heaviest (S) from the bottom of the settler are withdrawn into one seal and the precipitates Fe (OH) j and Mn {OH) j go into the other seal. The clarified water from the clarifier is fed to a clarifying filter for cleaning.

Wash water from the sorption filter

After clarification in the settling tank, they are fed to the filter for further purification. The condensed precipitates from the seals are sent to a vacuum filter for dehydration. Dehydrated sediments of Pe (OH) G and Mn (OH) 4 are ready raw materials for preparing ocher paint, sulfur - raw materials for the manufacture of decorative plates, and the sludge of oil products - for fertilizer.

The use of a solution of sodium chloride with a concentration of 3-5 g mol / l as the working fluid of the ejector contributes to an increase in the degree of degassing due to a change in the depth of vacuum in the degasser.

The effect of water salinity on the change in vacuum at the velocity of water in the ejector nozzle 11.4 m / s is shown in Table 1.

With a salinity of up to 3 g mol / l, the efficiency of degassing increases slightly, and with the mineralization of Bbmje 5 g mol / l, an increase in the consumption of salinity does not increase the degree of degassing

Example According to this technology, the source water is treated in a degasser of о / 100 mm loaded with rings of rigid PVC pipes of 881.5 mm in size under a vacuum of 5–10 Pa with a water irrigation density of 50 m. The oxidation is carried out with sodium hypochlorite, the consumption of which per mg of Fe is 0.5 mg; on

1 mg MP

1.35, for 1 mg of petroleum products 3 mg. The lime consumption for alkalizing is 60 mg / l. At the same time, the treated water is passed through a clarifying filter loaded with quartz sand with a particle size of 1.2-2.0 mm with 1.7-1.8 mm; the coefficient of heterogeneity of 2.5; 1.5 m high, as well as through a sorption filter, the loading of which is AG-3, 0.5-2.0 mm in diameter and 1.5 Mo height. Comparative data with the known method are presented in Table 2,

Claims (1)

Invention Formula The method of purification of groundwater from iron, manganese, hydrogen sulfide, carbon dioxide, methane and petroleum products, including degassing, oxidation and alkalinization, followed by filtration, disinfection and treatment 15 thief Å & followed by calcining the resulting sludge by settling, sludge and using it for compaction and by dehydration, by alkalization before filtration. Table 1 Whereas, in order to increase the degree of purification from methane and carbon dioxide while maintaining a high degree of purification from iron, manganese, hydrogen sulfide and petroleum products, degassing is performed by vacuuming with a zjektor using 3-5 mol of sodium chloride as a working fluid. per liter, the gases released during the zinc injection are separated from the working fluid, which is recycled, and the gases are passed through 5.0 19.5 1.03 (in I I I about I I II t I I I I ro in s M about oo about about vO J about r 00 o about CO "H 0 a CN | one about t m oh oh "H" I t in about "H r - “N - (N U n I CM N "L "H X 0) " U p) yo H J o 00 ti Z 1L g and U x: yoo o to about R. with; and but Well n o 0) sh SP S - cm go - sd