RU2433960C1 - Method of purifying waste water from copper ions - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention can be used to remove copper ions from waste water. In order to implement the method, waste water is filtered through a nepheline sludge sorbent. The height of the sorbent layer ranges from 0.035 m to 0.045 m.

EFFECT: method increases rate of filtering waste water which cuts treatment time, reduces sorbent consumption and lowers the cost of treatment.

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Description

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

A known method of wastewater treatment from heavy metals and organic substances (SU 1560483, CO2F 1/28, BI No. 16, 1990), comprising treating with ash and separating sediment by sedimentation, in which wastewater is first treated with ash containing calcium oxide 30 -50%, to pH = 8.75-9.25, and then ash containing calcium oxide 3-5%, to pH = 6.5.

The disadvantages of this method is the low cleaning efficiency due to the low sorption capacity of the ash with respect to copper, low filtration rate and the complexity of the process.

A known method of wastewater treatment from copper ions (SU 1495308, C02F 1/62, BI No. 27, 1989), in which water is treated with an alkaline solution and activated carbon, followed by maintaining the mixture at a temperature of 50-55 ° C for 30 minutes and separation draft.

The disadvantages of this method are the low efficiency of wastewater treatment from copper ions, low filtration rate and additional costs for technological operations for heating and settling of the solution.

The closest in technical essence to the claimed technical solution is the selected prototype method of wastewater treatment from copper ions, which is based on filtering through a sorbent layer with a layer thickness of 0.5-0.6 m, and quartz-glauconite sand with a content of glauconite 60-80% (RU No. 2137717, C02F 1/28, CO2F 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, which leads to a high cost of cleaning.

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 consumption of sorbent, which leads to a decrease in the cost of treatment.

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, by filtering wastewater through a sorbent, nepheline sludge is used as a sorbent, and the height of the sorbent layer is from 0.035 to 0.045 m.

EXAMPLE OF SPECIFIC PERFORMANCE

The proposed method is as follows. As the filter material used nepheline sludge.

Nepheline sludge is a waste from the production of alumina from nepheline ores.

For sorption, nepheline sludge with grain sizes of 2.5-2.7 mm was 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 0.035-0.045 m, the mass of the sorbent (15-25 g), the filtration rate was assumed to be 5 m / h, which corresponds to the filtration rate in real filters at wastewater 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 using 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 Nepheline sludge 0,035 1,50 0 5 0,040 1,50 0 5 0,045 1,50 0 5 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 nepheline sludge as a sorbent is the ability to clean copper ions with a higher initial concentration of copper ions compared to the prototype and the ability to replace natural material (quartz-glauconite sand) with waste products.

Claims (1)

A method of treating wastewater from copper ions, including treatment with a sorbent, by filtering wastewater through a sorbent, characterized in that nepheline sludge is used as the sorbent, and the height of the sorbent layer is from 0.035 to 0.045 m.