RU2477708C2 - Method of cleaning effluents of copper ions - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention may be used for cleaning effluents from copper ions by sorption. For this, effluents are forced through sorbent composed of 0.055-0.065 m-thick hydrated cement layer with grain size of 0.114-0.315 mm.

EFFECT: higher rate of filtration, faster purification, lower costs.

1 tbl, 1 ex

Description

The invention relates to water treatment 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 (AC 1560483, C02F 1/28, BI No. 16, 1990), comprising treating with ash and separating the precipitate 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 (AC 1495308, C02F 1/62 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 ° C for 30 minutes and separating the precipitate .

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 selected prototype method of wastewater treatment from copper ions, which is based on filtration through a layer of sorbent, which is used as a waste of ground foam gypsum (RU No. 2360868, C02F 1/28, B01J 20/28 published on July 10, 2009).

The disadvantage of this method is the low filtration rate, which leads to an increase in cleaning time, high consumption of sorbent.

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 purification of wastewater from copper ions, including filtering through a sorbent layer, hydrated cement with a layer thickness of 0.055-0.065 m with a grain size of 0.114-0.315 mm is used as a sorbent.

EXAMPLE OF SPECIFIC PERFORMANCE

The proposed method is as follows. As the filter material, hydrated cement is used.

For sorption, cement with grain sizes of 0.114-0.315 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 0.055-0.065 m, the mass of the sorbent is 10-15 g, the filtration rate was assumed to be 5 m / h, which corresponds to the filtration rate in real filters at treatment facilities. 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.

The method allows to increase the filtration rate by 1.25 times, which leads to a reduction in cleaning time and by 33% can reduce the consumption of sorbent.

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 Hydrated cement 0,055 1,50 0 5 0,060 1,50 0 5 0,065 1,50 0 5 0,055 6.50 0.001 5 0,060 6.50 0.001 5 0,065 6.50 0.001 5 0,055 11.50 0.015 5 0,060 11.50 0.015 5 0,065 11.50 0.015 5 PROTOTYPE Ground Gypsum 0,075 1,50 0 four 0,085 1,50 0 four 0,090 1,50 0 four 0,075 6.50 0.001 four 0,085 6.50 0.001 four 0,090 6.50 0.001 four 0,075 11.50 0.015 four 0,085 11.50 0.015 four 0,090 11.50 0.015 four

Claims (1)

A method of treating wastewater from copper ions, including filtration through a sorbent layer, characterized in that hydrated cement with a layer thickness of 0.055-0.065 m with a grain size of 0.114-0.315 mm is used as the sorbent.