RU2327647C1 - Method of sewage water purification against copper ions - Google Patents

Abstract

FIELD: water purification.

SUBSTANCE: invention belongs to water purification technology, particularly to the sewage water purification against copper ions by sorption. The method of anti-ion purification includes sewage water filtration through ground non-autoclave foam concrete waste as the sorbing agent. Filtration is carried out through the 0.1-0.2 m thick sorbing agent layer.

EFFECT: increase in filtration speed; reduction of purification time; reduction of the sorbing agent layer thickness and sorbing agent saving.

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Description

The invention relates to water purification technology, in particular to the treatment of wastewater from copper ions by sorption.

A known method of treating wastewater from heavy metals and organic substances (A.S. 1560483, CO2 02/28, BI No. 16, 1990), comprising treating with ash and separating the sludge by sedimentation, in which the wastewater is treated first with ash containing CaO 30-50%, to a pH of 8.75-9.25, and then with ash containing CaO 3-5%, to a pH of 6.5.

The disadvantage of this method is the low cleaning efficiency due to the low sorption capacity of the ash in relation to copper and the complexity of the process.

A known method of treating wastewater from copper ions (A.S. 1495308, CO2 02/62, BI No. 27, 1989), in which the water is treated with an alkaline solution and activated carbon, followed by maintaining the mixture at a temperature of 50-55 degrees for 30 minutes and sediment separation.

The disadvantage of this method is the low efficiency of wastewater treatment from copper ions and the high cost of treatment due to the high cost of the sorbent and the additional costs of technological operations for heating and settling the solution.

The closest in technical essence to the claimed technical solution is the prototype method for purification of wastewater from copper ions, which is based on filtering through a sorbent layer with a thickness of 0.5-0.6 m, and quartz-glauconite sand with a content of glauconite 60-80% (RU No. 2137717, C02F 1/28, C02F 1/62, 09/20/1999).

The disadvantage of this method is the low filtration rate, which leads to an increase in cleaning time, a large consumption of sorbent and the inability to treat wastewater from several metals at the same time.

The problem to which the invention is directed, is to increase the filtration rate during wastewater treatment, which leads to a reduction in cleaning time and a decrease in the height of the sorbent layer, which leads to its savings.

The problem in the proposed solution is achieved by the fact that in the method of treating wastewater from copper ions, including treatment with a sorbent, ground waste of non-autoclave foam concrete is used as the sorbent, and the cleaning is carried out by filtration through a sorbent with a layer thickness of 0.1-0.2 m.

Concrete example

The proposed method is as follows. As the filter material using crushed waste non-autoclave foam.

Non-autoclave foam concrete is a complex composite material obtained by mixing and reacting cement, a protein-based foaming agent, sand and water.

For sorption, non-autoclave foam concrete wastes with grain sizes of 0.114-0.315 mm were used, which corresponds to the requirements for filtering materials. Filtration was carried out in a column with a diameter of 30 mm and a height of 400 mm.

Wastewater containing copper ions was filtered. The thickness of the sorbent layer is 0.1-0.2 m, the mass of the sorbent (25-40 g), the filtration rate was assumed to be 3 m / h, which corresponds to the filtration rate in real filters at sewage treatment plants. Sampling was carried out at the end of the filtration time. The concentration of copper ions was determined. The degree of purification of water from heavy metal ions was monitored on an atomic absorption spectrometer.

The table shows the results obtained on the quality of wastewater treatment for a fraction of 0.114-0.315 mm.

Table Material used for cleaning. Sorbent layer height, m The initial concentration of copper ions, mg / l The final concentration of copper ions mg / l Filtration rate, m / h OFFERED Ground Foam Concrete 0.1 1.00 0 3 0.1 1.00 0 3 0.2 1.00 0 3 PROTOTYPE Quartz-glauconite sand, with a content of glauconite 60-80% 0.5-0.6 0.11 0 1-2

An additional advantage of using non-autoclave foam concrete waste as a sorbent is the ability to clean copper ions with a higher initial concentration compared to the prototype and the ability to replace natural material (quartz-glauconite sand) with non-autoclave foam concrete waste.

Claims (1)

A method of treating wastewater from copper ions, including treatment with a sorbent, characterized in that the waste material is crushed non-autoclaved foam concrete is used as the sorbent, and the treatment is carried out by filtration through a sorbent with a layer thickness of 0.1-0.2 m.