RU2442754C2 - Purifying method for ground water consisting in elimination of ferrum and manganese and small-scale installation for its implementation - Google Patents

Purifying method for ground water consisting in elimination of ferrum and manganese and small-scale installation for its implementation Download PDF

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RU2442754C2
RU2442754C2 RU2010106945/05A RU2010106945A RU2442754C2 RU 2442754 C2 RU2442754 C2 RU 2442754C2 RU 2010106945/05 A RU2010106945/05 A RU 2010106945/05A RU 2010106945 A RU2010106945 A RU 2010106945A RU 2442754 C2 RU2442754 C2 RU 2442754C2
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water
manganese
filter
aeration
tank
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RU2010106945A (en
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Эдуард Александрович Кюберис (RU)
Эдуард Александрович Кюберис
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Эдуард Александрович Кюберис
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Abstract

FIELD: water purification.
SUBSTANCE: invention refers to reactant purification of the ground waters with rich in ferrum and manganese and can be used for water supply in small settlements, recreation facilities, country houses, country estates and farms. The suggested method includes aeration of the initial water with its further alkalizing. These processes progress in the aeration tank that incorporates an aeration device, a mixer, and a contact area. In order to intensify mixing of the chemical agent with water, the compressed air from the compressor is fed into the aeration tank. For the sake of additional oxidation sodium hypochlorite is introduced providing the necessary contact time and further extraction of the ferrous and ferric iron and manganese compounds by filtering by means of two-ply loading. The suggested small-scale installation contains a coarse mesh filter 1, an aeration tank 3, a compressor 6, a dosing unit for the alkalizing chemical agent 2, a booster pump 7, a dosing unit for the oxygen carrier 8, a forcing catalyst cage 9, a forcing deironing filter 10, a fine filter 11, a tank with clean water 12, the third stage pump 13, and certain valves.
EFFECT: removing of high ferrum (no more than 20 mg/l) and manganese (no more than 2.0 mg/l) concentrations from the ground water if there is hydrogen sulphide, carbon dioxide, a high oxidation characteristic in the water, in the low temperature conditions, in case of a low pH (no more than 6.5) and alkalescency (no more than 2+[Fe2+]/28).
2 cl, 1 dwg, 2 tbl, 2 ex

Description

The invention relates to reagent treatment of groundwater with a high content of iron and manganese and can be used to supply small residential villages, recreation centers, country cottages, estates and farms.
A known method of purifying water from manganese, which consists in passing it through a filter charge, moreover, carbonate type manganese ore thermally modified at 400-600 ° C for at least 30 minutes, which is simultaneously a catalyst for the oxidation of manganese to poorly soluble, is used as a filter charge. manganese oxide. The method provides the simplification and cheapening of water purification from manganese by eliminating the operation of renewing the catalytic properties of the filter load with chemical reagents (RF patent No. 2184708, C02F 1/64, 2001).
This method allows to achieve residual manganese concentrations of 0.1 mg / L. This meets the requirements of SanPiN 2.1.4.1074-01 "Hygienic requirements for water quality of centralized drinking water supply systems. Quality control".
However, this technology does not allow to provide the required quality of purified water for manganese under conditions of low pH (less than 6.5) and alkalinity (less than 2+ [Fe 2+ ] / 28). In addition, if any form of organic iron is present in water, an organic film forms over time on the surface of the granules of the catalytic material, which isolates the catalyst — manganese dioxide — from water. Thus, the entire catalytic ability of the catalytic loading is reduced to zero.
A known method of active demanganization of a liquid, including evacuating and mixing the liquid stream by dispersing with an oxidizing agent, supplying the resulting gas-liquid mixture to a housing with an unfilled filter charge and subsequent separate removal of the purified liquid and gas, the liquid stream being separated and sent before evacuation through the corresponding vacuum spray heads. The vacuum zones of the spray heads communicate with each other. The oxidizer is supplied to the communicating vacuum zone by self-priming, and then there is a process of intensive mixing or reaction with the liquid being cleaned. The supply of an ozone-air mixture as an oxidizing agent provides for the oxidation of organic and inorganic hardly oxidizable substances in short-cycle mass transfer (RF patent No. 2230708, C02F 1/64, 2003).
The same patent describes a device that contains a filter loading housing, a fluid supply pipe, a nozzle with a Venturi nozzle and a mixer located concentrically on the outside of the nozzle, made in the form of cylinders connected to the latter with calibration holes and with a gradually increasing diameter and length , and a branch pipe for removal of the purified water and gas. The fluid supply pipe is equipped with a liquid flow distributor with outlet sections, each of which is connected to the nozzle with a Venturi nozzle, and the mixers are placed in closed zones, interconnected by a vacuum line, which is connected to an additional oxidant supply pipe.
The disadvantage of this method and device is bulky equipment, which requires large areas. In addition, a high level of automation systems is necessary for the destruction of excess ozone, since it is highly toxic and can affect the respiratory system. The equipment is quite expensive. Possible formation of by-products of ozonolysis.
A known method of purification of drinking water, comprising sequentially treating the water to be purified with potassium permanganate and hydrogen peroxide, followed by filtering on sand filters, moreover, hydrogen peroxide is supplied in a ratio of 1: 3 to excess potassium permanganate, and the ratio of the doses of potassium permanganate and hydrogen peroxide during water treatment is from 15: 1 to 6: 1. In addition, potassium permanganate is dosed in excess with respect to its stoichiometric amount necessary for the oxidation of ferrous and manganese. The method provides an increase in the degree of purification of drinking water from iron and manganese in their joint presence, including colloidal forms of the compounds of these metals, under conditions of low temperatures, low alkalinity and reduced water hardness (RF patent No. 2238912, C02F 1/64, 2003).
This method allows to achieve residual concentrations of iron and manganese, respectively, 0.3 and 0.1 mg / L. This meets the requirements of SanPiN 2.1.4.1074-01 "Hygienic requirements for water quality of centralized drinking water supply systems. Quality control".
The disadvantages of this method include the high cost of expensive reagents (potassium permanganate and hydrogen peroxide), as well as possible breakthroughs of iron and manganese in purified water when their initial concentrations fluctuate. Moreover, this technology does not allow to provide the necessary quality of purified water for iron and manganese in conditions of low pH (less than 6.5).
Closest to the proposed method is a combined method of purifying water from iron, selected as a prototype, providing for its aeration, oxidation, liming (option), coagulation, flocculation (option), followed by settling or processing in a layer of suspended sediment and filtering through a granular charge ( Nikoladze G.I. Deferrization of Natural and Recycled Waters .-- M .: Stroyizdat, 1978, p. 43).
The disadvantage of this method is the complexity of the water treatment process that requires the use of a large number of reagents (lime, chlorine, coagulant, flocculant), bulky equipment, which requires large areas to accommodate. All this, in addition, significantly increases the cost of purifying drinking water. The introduction of chlorine into water can lead to the formation of toxic volatile compounds - trihalomethanes (THM).
Closest to the proposed installation is a water treatment plant of the "Jet" type, selected as a prototype, including an aeration tank, a source water pump, a thin-layer sump, a quick filter, a water tower, an alkalization unit, a water disinfection unit, and metering pumps (Mints D. M. Installations of low productivity for the purification and disinfection of drinking and wastewater. - M .: Stroyizdat, 1974, p.11).
The disadvantage of this installation is the complexity of the technological process of operating thin-layer sedimentation tanks, bulky equipment, which requires large areas for placement, as well as the presence of a water tower. All this, in addition, significantly increases the cost of purifying drinking water.
The proposed inventions solve the problem of removing from underground water high concentrations of iron (up to 20 mg / l) and manganese (up to 2.2 mg / l) in the presence of hydrogen sulfide, carbon dioxide, high oxidizability, low temperature, low pH (less than 6 , 5) and alkalinity (less than 2+ [Fe 2+ ] / 28).
To obtain such a technical result in the proposed method, which includes aeration of the source water, oxidation, followed by filtration through a granular charge, the water is pre-alkalized in the contact zone of the aerator tank to a pH of 8.5-8.8, while supplying compressed air, for oxidation use sodium hypochlorite, and filtering is carried out through a two-layer loading.
To achieve the above technical result, a small-sized installation is proposed, which contains an aeration device, an alkalizing reagent dosing complex, a pressure deferrizing filter, and additionally contains an oxidizer dosing complex, a compressor, an aeration tank that combines an aeration device, a mixer and a contact zone, a pressure contact chamber, a filter rough mechanical cleaning, fine filter, clean water tank, pumps of the second and third rises.
The proposed invention is illustrated in the drawing.
The proposed method is as follows. The source water is first aerated in a special device for aeration. Then the water is alkalinized in the contact zone of the tank-aerator to a pH of 8.5-8.8 with the simultaneous supply of compressed air. The compressed air supply is 3-5 l / s per 1 m 2 . For alkalization of water, for example, sodium hydroxide solution is used. Then, for the oxidation of iron and manganese compounds, sodium hypochlorite is introduced into water. The dose of a working (8%) sodium hypochlorite solution is 100-190 mg / l. Filtering is carried out through a two-layer loading. The filtration rate is 3-8 m / h. For loading a deferrizing filter, for example, a mixture of catalytic filtering materials is used: Sorbent AC - 0.7-1.5 mm (top layer) + Sorbent MS - 0.5-1.0 mm (bottom layer).
The applicant experimentally showed that when going beyond the specified range of changes in the intensity of the compressed air supply (3-5 l / s per 1 m 2 ) in the contact zone of the aerator tank, a decrease in the mixing of the reagent with water and overall cleaning efficiency is observed, and upward - significantly increases the performance and power of the compressor.
Moreover, it was experimentally shown that the most effective ranges of operating parameters are: pH in the contact zone of the tank-aerator 8.5-8.8; dose of 8% sodium hypochlorite solution 100-190 mg / l; filtration speed 3-8 m / h. If these parameters are not observed, a decrease in the degree of water purification from iron and manganese was observed.
During the experiments, the following oxidizing agents were investigated: sodium hypochlorite, calcium hypochlorite, potassium permanganate. The experiments showed that for the oxidation of iron and manganese compounds, it is most efficient to use (8%) sodium hypochlorite solution. With the introduction of the remaining specified oxidizing agents, a decrease in the degree of water purification from iron and manganese was observed.
As a result of the experiments, it was found that as a two-layer loading of the deferrizing filter, it is most effective to use a mixture of catalytic filtering materials: Sorbent AC - 0.7-1.5 mm (upper layer) + Sorbent MS - 0.5-1.0 mm (lower layer). If these parameters are not observed, a decrease in the degree of water purification from iron and manganese was observed.
A small-sized installation consists of a coarse mechanical filter 1, an alkalizing reagent dosing complex 2, an aerator tank 3 combining an aeration device 4, a mixer and a contact zone 5, a compressor 6, a second lift pump 7, an oxidizer 8 dosing complex, a pressure contact chamber 9 , pressure deferrizing filter 10. The installation also contains a fine filter 11, a clean water tank 12, a pump of the third rise 13.
Small-sized installation works as follows. The source water from the well at a pressure of 25-45 m is supplied to the aerator tank 3. Before the aerator tank 3, the water passes through a rough mechanical filter 1 to remove large mechanical impurities larger than 100 microns. Aeration of the source water is carried out in the aeration device 4 located in the aeration zone of the tank-aerator 3. For aeration use, for example, slotted nozzles. Aeration ensures the removal of excess carbon dioxide and hydrogen sulfide, as well as iron bicarbonate, which is a weak, easily hydrolyzable compound in water. The aerator tank 3 combines an aeration device 4, a mixer, and a contact zone 5. An alkalizing reagent 2 is introduced into the contact zone 5 of the aerator tank 3 to increase the pH of the water to 8.5-8.8, creating favorable conditions for the oxidation of iron and manganese . As alkalizing reagent, for example, sodium hydroxide solution is used. To intensify the mixing process of the introduced alkalizing reagent with the treated water, air is supplied to the contact zone 5 from the compressor 6. The tank-aerator 3 is equipped with a valve for emptying and dumping the accumulated sludge (not shown in the drawing). The tank-aerator 3 is equipped with a float level controller (not shown in the drawing) that controls the operation of the submersible and transfer pump 7, compressor 6 and the dosing complex 2. Next, the water from the pumping station of the second lift 7 is supplied to the pressure contact chamber 9. Before that, using the dosing complex oxidizing agent 8 is introduced into the water oxidizing agent - sodium hypochlorite. Under the action of sodium hypochlorite, humates and other organic compounds of iron and manganese are destroyed, as well as their subsequent transition to the form of inorganic salts of ferric and manganese tetravalent, which are easily hydrolyzed with precipitation, which is removed by filtration through a two-layer catalytic charge located in the pressure head deferrizing filter 10. The deferrizing filter 10 is equipped with a pressure line for washing and discharging the accumulated sludge. The washing of the filter 10 takes place automatically in the volume of purified water. The flushing signal comes from the built-in water meter. The washing process is controlled by an automatic control unit. Then the water passes through a fine filter 11, where suspended particles of more than 5-10 microns are removed from it. The purified water accumulates in the tank of clean water 12, from where, using the pumping station of the third rise 13, it is supplied to the consumer in the required quantity and with the required pressure. The washing of the deferrizing filter 10 is carried out with purified water with an intensity of 8-14 l / s per 1 m 2 .
Example 1. According to the above description and the proposed method, groundwater was cleaned of iron and manganese in a small-sized installation for its implementation with a capacity of 0.5 m 3 / hour was carried out in natural conditions, directly at the underground water supply source. The quality indicators of the source water and the results of its treatment are presented in table 1.
The data in table 1 show that the method of purification of groundwater from iron and manganese and a small-sized installation for its implementation provide the required degree of purification of groundwater for iron, manganese, oxidizability, turbidity and color.
Example 2. According to the above description and the proposed method, groundwater was cleaned of iron and manganese in a small-sized installation for its implementation with a capacity of 0.5 m 3 / hour was carried out in natural conditions, directly at the underground water supply source. The quality indicators of the source water and the results of its treatment are presented in table 2.
The data in table 2 show that the method of purification of groundwater from iron and manganese and a small-sized installation for its implementation provide the required degree of purification of groundwater for iron, manganese, oxidizability, turbidity and color.
The positive effect of the proposed method and small-sized installation for its implementation is that high concentrations of iron (up to 20 mg / l) and manganese (up to 2.0 mg / l) are removed from underground water in the presence of hydrogen sulfide, carbon dioxide, high oxidizability in water , at low temperatures, low pH (less than 6.5) and alkalinity (less than 2+ [Fe 2+ ] / 28).
Table 1
Quality indicators Source water Purified water Normative
Temperature ° C 5 8 -
pH, unit 5.9 8.8 6-9
Turbidity, mg / l 7.4 0.7 1,5
Color, degrees 66.0 less than 5.0 20,0
Hydrogen sulfide, mg / l 4,5 0.05 -
Total iron, mg / l 14.6 0.23 0.3
Manganese, mg / L 2.2 0.08 0.1
Alkalinity, mEq / L 1,5 - -
Permanganate oxidation, mg O 2 / l 10,4 1,5 5,0
table 2
Quality indicators Source water Purified water Normative
Temperature ° C four 8 -
pH, unit 6.25 8.7 6-9
Turbidity, mg / l 6.1 less than 0.58 1,5
Color, degrees 50,0 less than 5.0 20,0
Total iron, mg / l 18.0 0.20 0.3
Manganese, mg / L 0.8 0.05 0.1
Alkalinity, mEq / L 2.2 - -
Permanganate oxidation, mg O 2 / l 4.88 0.5 5,0

Claims (2)

1. The method of purification of groundwater from iron and manganese, including aeration of the source water, oxidation, followed by filtration through a granular charge, characterized in that the water is pre-alkalized in the contact zone of the aerator tank to a pH of 8.5-8.8 with the simultaneous supply of compressed air, sodium hypochlorite is used for additional oxidation, and filtering is carried out through a two-layer loading.
2. A small-sized installation of underground water purification from iron and manganese, containing a device for aeration, a complex for dispensing an alkalizing reagent, a pressure deferrizing filter, characterized in that it additionally contains a complex for dispensing an oxidizing agent, a compressor, a tank-aerator, a unit for aeration, a mixer and a contact zone, pressure chamber, coarse filter, fine filter, clean water tank, pumps of the second and third rises, while the water first passes the filter coarsely minutes mechanical cleaning, then enters the tank aerator, then set the second lifting pump station, pressurized contact chamber pressure obezzhelezivayuschy filter, fine filter, clean water tank, a pumping station of the third rise.
RU2010106945/05A 2010-02-24 2010-02-24 Purifying method for ground water consisting in elimination of ferrum and manganese and small-scale installation for its implementation RU2442754C2 (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MD4288C1 (en) * 2013-04-02 2015-01-31 Институт Химии Академии Наук Молдовы Process for groundwater treatment from hydrogen sulfide, iron (II) and manganese (II) ions
RU2563476C2 (en) * 2013-10-23 2015-09-20 Акционерное общество "Государственный научный центр Российской Федерации - Физико-энергетический институт имени А.И. Лейпунского" Module of sorption treatment of liquid medium
CN105327547A (en) * 2015-11-03 2016-02-17 重庆植恩药业有限公司 Liquid purifying device
CN106242184A (en) * 2016-08-30 2016-12-21 湖南中大经纬地热开发科技有限公司 Underground water deferrization and demanganization device
CN106242183A (en) * 2016-08-30 2016-12-21 湖南中大经纬地热开发科技有限公司 Can the underground water deferrization and demanganization device of microorganisms and filter method online
CN106315907A (en) * 2015-06-23 2017-01-11 东丽先端材料研究开发(中国)有限公司 Sewage reuse method
CN106966512A (en) * 2017-05-09 2017-07-21 北京工业大学 Couple autotrophic denitrification cryogenically descends aquatic organism deferrization and demanganization process to start method
RU191342U1 (en) * 2018-10-24 2019-08-01 Общество с ограниченной ответственностью "7 Тех" Water purification device for iron, manganese, suspended particles and insoluble compounds

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RU2184708C1 (en) * 2001-01-15 2002-07-10 Институт горного дела - научно-исследовательское учреждение СО РАН Method of treatment of water from manganese
RU2230708C1 (en) * 2003-06-05 2004-06-20 Открытое акционерное общество проектно-изыскательский институт "Волгоградпроект Method and apparatus for active demanganation of liquid
RU2238912C2 (en) * 2002-01-29 2004-10-27 Общество с ограниченной ответственностью НПО "ЭГИД" Drinking water treatment method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4028045A1 (en) * 1990-09-05 1992-03-12 Benckiser Wassertechnik Joh A Procedure and device for treatment of water with ozone to remove metal ions - measurement of ozone content of treated water before filtration is used to adjust ozone content by controlled dosing with raw water
RU2184708C1 (en) * 2001-01-15 2002-07-10 Институт горного дела - научно-исследовательское учреждение СО РАН Method of treatment of water from manganese
RU2238912C2 (en) * 2002-01-29 2004-10-27 Общество с ограниченной ответственностью НПО "ЭГИД" Drinking water treatment method
RU2230708C1 (en) * 2003-06-05 2004-06-20 Открытое акционерное общество проектно-изыскательский институт "Волгоградпроект Method and apparatus for active demanganation of liquid

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MD4288C1 (en) * 2013-04-02 2015-01-31 Институт Химии Академии Наук Молдовы Process for groundwater treatment from hydrogen sulfide, iron (II) and manganese (II) ions
RU2563476C2 (en) * 2013-10-23 2015-09-20 Акционерное общество "Государственный научный центр Российской Федерации - Физико-энергетический институт имени А.И. Лейпунского" Module of sorption treatment of liquid medium
CN106315907A (en) * 2015-06-23 2017-01-11 东丽先端材料研究开发(中国)有限公司 Sewage reuse method
CN105327547A (en) * 2015-11-03 2016-02-17 重庆植恩药业有限公司 Liquid purifying device
CN106242184A (en) * 2016-08-30 2016-12-21 湖南中大经纬地热开发科技有限公司 Underground water deferrization and demanganization device
CN106242183A (en) * 2016-08-30 2016-12-21 湖南中大经纬地热开发科技有限公司 Can the underground water deferrization and demanganization device of microorganisms and filter method online
CN106966512A (en) * 2017-05-09 2017-07-21 北京工业大学 Couple autotrophic denitrification cryogenically descends aquatic organism deferrization and demanganization process to start method
CN106966512B (en) * 2017-05-09 2020-06-16 北京工业大学 Starting method of iron and manganese removal process for low-temperature underground water organisms coupled with autotrophic nitrogen removal
RU191342U1 (en) * 2018-10-24 2019-08-01 Общество с ограниченной ответственностью "7 Тех" Water purification device for iron, manganese, suspended particles and insoluble compounds

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