RU2553890C1 - Method of purifying waste water from ammonium and heavy metal ions - Google Patents

Method of purifying waste water from ammonium and heavy metal ions Download PDF

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RU2553890C1
RU2553890C1 RU2014128416/05A RU2014128416A RU2553890C1 RU 2553890 C1 RU2553890 C1 RU 2553890C1 RU 2014128416/05 A RU2014128416/05 A RU 2014128416/05A RU 2014128416 A RU2014128416 A RU 2014128416A RU 2553890 C1 RU2553890 C1 RU 2553890C1
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natural zeolite
heavy metal
carried out
waste water
ammonium
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RU2014128416/05A
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Russian (ru)
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Алексей Семенович Овчинников
Мария Алексеевна Денисова
Ольга Владимировна Козинская
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Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования Волгоградский государственный аграрный университет (ФГБОУ ВПО Волгоградский ГАУ)
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Abstract

FIELD: chemistry.
SUBSTANCE: method of purifying waste water includes adding a natural zeolite to the water to be treated, mixing, settling and filtering. The natural zeolite used is a natural zeolite containing 50-60% clinoptilolite with particle size of 1.0-1.5 mm. Uniform mixing is carried out at a rate of 1-2 rps for 10-15 s and settling is carried out for 12-48 hours.
EFFECT: low content of heavy metal and ammonium ions when treating waste water below the maximum allowable concentration while enabling use of the treated water for crop irrigation.
1 tbl, 2 ex

Description

The invention relates to a method for wastewater treatment from ions of heavy metals and ammonium, which can be used for irrigation of crops.

There is a method of treating wastewater from heavy metal ions by sorption on a solid insoluble natural sorbent, using talc slate with a talc mineral content of 45% and a sorbent grain size of 2.50 to 3.00 mm as a natural sorbent (Patent RF №2433959, published on November 20, 2011).

A known method of treating wastewater from heavy metal ions by sorption on a solid insoluble natural sorbent, while shale with a biotite mineral content of at least 25%, with sorbent grain size from 2.50 to 3.00 mm is used as a natural sorbent (RF Patent No. 2496723, publ. 10/27/2013).

A disadvantage of the known technical solutions that impede the achievement of the claimed technical result is the impossibility of treating wastewater from ammonium ions.

A known method of treating wastewater from ammonium ions, including adjusting the pH of the wastewater with a reagent, followed by treating the wastewater with an oxidizing agent in an equivalent amount or in excess of 5% of the amount of ammonium ions, the wastewater pH being maintained at no more than 5, and using an oxidizing agent clarified wastewater of gas treatment plants generated during the purification of chlorine-containing gas with lime milk (RF Patent No. 2253626, publ. 06/10/2005).

A disadvantage of the known technical solutions that impede the achievement of the claimed technical result is the low degree of purification of wastewater from heavy metals.

For the prototype, a method was selected for treating wastewater from heavy metals, in which milk of lime, iron sulfate and zeolite are added to the water to be purified, while zeolite is added first, and milk of lime and iron sulfate after mixing the zeolite with water, then the water is subsequently settled, clarified water aerated, treated with pulsed barrier discharges from the calculation of the cost of electricity of at least 50 W · h / m 3 water and filtered, using natural zeolite, crushed to a fraction of not more than 0.3 mm (RF Patent No. 2397959, publ. 27.08 .2010).

A disadvantage of the known technical solution that impedes the achievement of the claimed technical result is the inability to purify waste water from ammonium ions.

The task is the ability to purify wastewater from ammonium ions and heavy metals.

EFFECT: reduced content of heavy metal ions and ammonium ions during wastewater treatment below the maximum permissible concentration (MPC) with the possibility of using purified water for irrigation of crops.

The technical result is achieved by the method of wastewater treatment from ammonium ions and heavy metals, according to which natural zeolite is added to the purified water, stirring, settling, filtering are carried out, while natural zeolite with clinoptilolite content of 50-60% with fraction size 1 is used , 0-1.5 mm, they carry out uniform mixing with a rotation speed of 1-2 rpm for 10-15 seconds, sedimentation is carried out in the range of 12-48 hours.

The essential features affecting the achievement of the claimed technical result are:

- the use of natural zeolite as a natural zeolite with a clinoptilolite content of 50-60% with a particle size of 1.0-1.5 mm;

- the implementation of uniform mixing with a rotation speed of 1-2 rpm for 10-15 seconds;

- conducting sedimentation in the range of 12-48 hours.

Zeolites - a group of minerals of volcanic-sedimentary origin, frame aluminosilicates of alkali and alkaline earth metals. Currently, more than 40 structural types of natural zeolites are known, the most common of which are clinoptilolite, heylandite, phillipsite, lomonite, mordenite, erionite, chabazite, ferrierite, and analcime. Industrial deposits of zeolites are mainly represented by zeolite-containing tuffs with a zeolite content of up to 60-95%. The remaining 5-40% of the rock is usually represented by quartz, feldspars, clay materials, the remains of unsubstituted volcanic glass (http://www.zeolite.spb.ru/).

The use of natural zeolite with a clinoptilolite content of 50-60% is optimal for obtaining the claimed technical result. A change in the percentage of clinoptilolite worsens the characteristics of the treated wastewater by the content of ammonium ions and heavy metals.

The fraction size of 1.0-1.5 mm is selected experimentally and is sufficient and necessary. Reducing the size does not provide cleaning efficiency, and an increase does not increase the degree of cleaning.

The implementation of uniform mixing with a rotation speed of 1-2 rpm for 10-15 seconds was determined by experiments. Changing the declared intervals in the direction of increasing or decreasing does not increase the degree of wastewater treatment below the MPC.

Holding sedimentation for 12-48 hours is also selected empirically and is optimal for achieving the claimed technical result

Examples of specific performance.

Example 1

Wastewater and natural zeolite with a clinoptilolite content of 50-60% and a fraction size of 1.0 mm were placed in conical flasks, uniform mixing was carried out with a rotation speed of 1 r / sec for 10 sec. Settling was carried out for 12 hours. After settling, filtration was carried out and the concentration of heavy metal ions, ammonium was determined by colorimetry.

Example 2

Wastewater and natural zeolite with a clinoptilolite content of 50-60% and a size of fractions of 1.5 mm were placed in conical flasks, uniform mixing was carried out with a rotation speed of 2 rpm for 15 sec. The sediment was carried out for 48 hours. After settling, filtration was carried out and the concentration of heavy metal ions, ammonium was determined by colorimetry.

Data on wastewater treatment are given in the table.

Figure 00000001

Figure 00000002

Wastewater purified from the content of heavy metal ions and ammonium ions to the maximum permissible concentrations was used for irrigation of crops.

Thus, the claimed method of wastewater treatment, in which natural zeolite is added to the water to be purified, is mixed, sedimented, filtered, while natural zeolite with a clinoptilolite content of 50-60% with a particle size of 1.0-1 is used, 5 mm, they carry out uniform mixing with a rotation speed of 1-2 rpm for 10-15 seconds, settle for 12-48 hours, allows to reduce the content of heavy metal ions and ammonium ions during wastewater treatment below the maximum tolerance concentration (MPC) with the possibility of using purified water for irrigation of crops.

Claims (1)

  1. The method of purification of wastewater from ammonium ions and heavy metals, in which natural zeolite is added to the water to be purified, mixing, settling, filtering are carried out, characterized in that natural zeolite with a clinoptilolite content of 50-60% with a fraction size of 1 is used, 0-1.5 mm, they carry out uniform mixing with a rotation speed of 1-2 rpm for 10-15 seconds, sedimentation is carried out in the range of 12-48 hours.
RU2014128416/05A 2014-07-10 2014-07-10 Method of purifying waste water from ammonium and heavy metal ions RU2553890C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU644736A1 (en) * 1976-03-01 1979-01-30 Институт минеральных ресурсов Method of purifying waste water from amines
SU1551659A1 (en) * 1986-10-28 1990-03-23 Производственное объединение "Грузгорнохимпром" Method of removing arsenic compounds from waste water
RU2055814C1 (en) * 1994-04-21 1996-03-10 Пензин Роман Андреевич Having nitrogen-bearing components and heavy metals minerals-free sewage purification method
RU2397959C2 (en) * 2008-09-10 2010-08-27 Николай Александрович Яворовский Method of purifying waste water from heavy metals
UA81844U (en) * 2013-02-05 2013-07-10 Львовський Государственный Университет Безопасности Жизнедеятельности Мчс Украины Process for additional purification of waste water from ions of heavy metals in agitation stream

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU644736A1 (en) * 1976-03-01 1979-01-30 Институт минеральных ресурсов Method of purifying waste water from amines
SU1551659A1 (en) * 1986-10-28 1990-03-23 Производственное объединение "Грузгорнохимпром" Method of removing arsenic compounds from waste water
RU2055814C1 (en) * 1994-04-21 1996-03-10 Пензин Роман Андреевич Having nitrogen-bearing components and heavy metals minerals-free sewage purification method
RU2397959C2 (en) * 2008-09-10 2010-08-27 Николай Александрович Яворовский Method of purifying waste water from heavy metals
UA81844U (en) * 2013-02-05 2013-07-10 Львовський Государственный Университет Безопасности Жизнедеятельности Мчс Украины Process for additional purification of waste water from ions of heavy metals in agitation stream

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