Wastewater treatment method

 

(57) Abstract:

The invention relates to sorption wastewater and can be used in the pulp and paper industry, petrochemical industry, metallurgy, food and other industries. For implementing the method as sorbent used the ashes obtained by burning the sludge is lignin, which is a waste of pulp and paper production, contain, weight. % 14,0 - 16,0; Fe2O34,0 - 6,0; CaO 2,5 - 3,5; SiO26,8 - 7,2; Al2O368,0 - 72,0. The method provides a higher degree of wastewater treatment complex chemical composition, but also allows to reduce the process of sorption. table 1.

The invention relates to methods of treatment of wastewater using adsorbents and can be used in the pulp and paper industry, petrochemical industry, metallurgy, food and other industries.

The known method of wastewater treatment, where as sorbents use the following connections: silicates, containing up to 40% Al2O3[Chemical encyclopedic dictionary. CH. Ed. I. P. Knunyants. - M.: Owls.encyclopedia, 1983, - 792 S. ] , zeolites [Sudnikovich Century BC, Skobeyev I. K., Libellule. - 1984. - N 12. - S. 90-91.], slag [application N 2-32950 Japan, op. 90.07.24 N 2-824].

However, these sorbents have a number of disadvantages, the main of which is the low selectivity and low capacity. The closest in technical essence and the achieved result is a method of wastewater treatment with the use of sorbent zeolite of the following composition (wt.%):

SiO2- 68,87; Al2O3- 12,5; Fe2O3- 0,83; TiO2- 0,011;

FeO - 0,1, Na2O - 1,85; CaO - 1,95; K2O - 2,88;

MgO - 1,5, Pb2O - 0,018, MnO - 0,05; P2O5- 0,01;

Li2O - 0,006; H2O - 9,425.

size - is-2.5+1.25 mm and -1,25+0,63 mm [Sudnikovich Century BC, Skobeyev I. K. , Lebedev, C. T., I. Egorova Century, the Use of natural ion exchangers for cleaning effluent from the flotation reagents //non-ferrous metallurgy. - 1984. - N 12. - S. 30-31].

However, the required degree of wastewater treatment to MAC for such a complex structure as the high-chromaticity-lignosulfonate, oily, with a high degree of rigidity, with a high content of iron ions and mercury is not achieved.

The invention aims to improve the level of wastewater treatment complex chemical composition and cheapen the process of sorption.


C - 14,0 - 16,0; SiO2- 6,8 - 7,2;

Fe2O3- 4,0 - 6,0; CaO - 2,5 - 3,5;

Al2O3- 68,0 - 72,0.

The efficiency of wastewater treatment complex structure by processing the ash due to the presence not only of a wide range of compounds, each of which shows the sorption properties of various types and has a high degree of affinity for different class of compounds, but also a synergistic effect. The use of ashes of the above composition as a sorbent is new and therefore the proposed solution meets the criteria of "novelty."

The invention is illustrated by the following examples.

Conditions of experiments on dynamic adsorption and determination of residual concentrations of substances in the filtrate in the static mode was kept constant in all samples and was carried out according to standard methods (Lurie Y. Yu, A. Rybnikov And. //Chemical analysis of industrial wastewater. - M., Izd-vo: Chemistry, 1974 - 335 S.; Parfitt, K., Rochester, Adsorption from solution on the surface of a solid phone, Moscow: Mir, 1 is offered by the Conference, Engels, APR. 1993).

Example 1.

In the burette, with a volume of 50 ml was placed 5 g of the proposed sorbent - ash, and filter the prepared model water - solution of sulfate lignin with a pH of 7, the chromaticity 2500oHKS, COD = 500 mg/l Filtered through a layer of sorbent is carried out before the "breakthrough" DOE and to establish a permanent indicator color in the filtrate PDOE defined residual COD mg/l

Example 2.

Do the same operations as in example 1, except that as a sorbent use Al2O3.

Example 3.

Do the same operations as in example 1, except that as a sorbent use zeolites, whose chemical composition is given above.

Example 4.

Do the same operations as in example 1, except that as a sorbent use slag CHP, the size of which is from-0.5 to +2 mm

Example 5.

In the burette, with a volume of 50 ml was placed 5 g of the proposed sorbent - ash, through which filtered prepared model water solution containing ions of Ca2+the concentration of CaCl23000 mg/l Filtered through a layer of sorbent is carried out before the "breakthrough" DOE and to establish a constant concentration of ions Ca

Example 7.

Do the same operations as in example 5, only as a sorbent use Al2O3.

Example 8.

Do the same operations as in example 5, but as sorbent use slag CHP, class size is from-0.5 to +2 mm

Example 9.

In the burette, with a volume of 50 ml was placed 5 g of the proposed sorbent - ash, through which filtered prepared model water solution containing ions Hg2+with a concentration of 0.01 mg/L. Filtered through a layer of sorbent is carried out before the "breakthrough" DOE and to establish a constant concentration of ions Hg2+in the filtrate, determine the residual concentration of Hg2+.

Example 10.

Do the same operations as in example 9, only as a sorbent use zeolites, chemical composition of which is set out on page 2.

Example 11.

Do the same operations as in example 9, only as a sorbent use Al2O3.

Example 12.

Do the same operations as in example 9, but as sarmentosum 5 g of the proposed sorbent - ash, through which filtered prepared model water solution containing ions of Fe2+the concentration of FeCl23000 mg/l Filtered through a layer of sorbent is carried out before the "breakthrough" DOE and to establish a constant ion concentration of Fe2+in the filtrate, determine the residual concentration of Fe2+.

Example 14.

Do the same operations as in example 13, only as a sorbent use zeolites, chemical composition of which is set out on page 2.

Example 15.

Do the same operations as in example 13, only as a sorbent use Al2O3.

Example 16.

Do the same operations as in example 13, but as a sorbent use slag CHP, the size of which is from-0.5 to +2 mm

Example 17.

In the burette, with a volume of 50 ml was placed 5 g of the proposed sorbent - ash, through which filtered prepared model water solution containing petroleum products. Petroleum concentration of 100 mg/L. Filtered through a layer of sorbent is carried out before the "breakthrough" DOE and to establish a constant concentration of oil in the filtrate, determine the residual concentration of oil.

An example of the chemical composition of which is given above (page 2).

Example 19.

Do the same operations as in example 17, only as a sorbent use Al2O3.

Example 20.

Do the same operations as in example 13, only as a sorbent use slag CHP, class size from -0,5 to +2 mm

Experimentally obtained data are given in the table.

From the presented results it is obvious that is used as a sorbent ash above composition significantly outperforms both capacitive and qualitative indicators of the process of sorption compared sorbents for all the investigated solutes, like this:

1. For lignosulfonate water THE proposed sorbent 7.3; 8,5; 17 times more in comparison with zeolites, aluminum oxide, slag, respectively. PDOE proposed sorbent 3.1; 2,4; 7,9 times more in comparison with zeolites, aluminum oxide, slag, respectively. Residual rate of COD values of the proposed sorbent 2; 2; 1,5 times less in comparison with zeolites, aluminum oxide, slag, respectively.

2. Extraction of ions of Ca2+DOE 1.7; 2; 5 times more in comparison with zeolites, aluminum oxide, slag, respectively. PDOE predlagaemaya concentration of Ca2+below the TLV for rigidity and 350 mg/L.

3. Extraction of ions Hg2+DOE 7.5; 5; 1.25 times more in comparison with zeolites, aluminum oxide, slag, respectively. PDOE proposed sorbent 5.7; 1; 2.8 times more in comparison with zeolites, aluminum oxide, slag, respectively.

Residual concentration of Hg2+below TLV and is is 0.0002 mg/l

4. Extraction of ions of Fe2+DOE 1.5; 1,9; 2.3 times more in comparison with zeolites, aluminum oxide, slag, respectively. PDOE proposed sorbent 1,3; 1,6; 3.4 times more in comparison with zeolites, aluminum oxide, slag, respectively. Residual concentration of Fe2+below TLV and is 0.3 mg/L.

5. Extraction of oil products DUE 1.75; 1; 7 times more in comparison with zeolites, aluminum oxide, slag, respectively. PDOE proposed sorbent 1.33; 1,14; 1,78 times more in comparison with zeolites, aluminum oxide, slag, respectively. Residual petroleum concentration below TLV and is 0.02 mg/L.

In addition to increasing the degree of purification to the norms proposed method is more economical in comparison with the above examples, as applied in these cases is proposed as the sorbent is a waste of pulp and paper production.

The method of purification of waste water by treating them with a sorbent, wherein as the sorbent used the ashes obtained by burning the sludge is lignin, which is a waste of pulp and paper production, containing wt.%:

C - 14 - 16

Al2O3- 68,0 - 72

Fe2O3- 4,0 - 6,0

CaO is 2.5 - 3.5

SiO2- 6,8 - 7,2

 

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FIELD: production of charcoal-fibrous adsorbents.

SUBSTANCE: the invention is dealt with the field of production of charcoal-fibrous adsorbents, in particular, with devices of charcoal-fibrous materials activation. The installation contains a vertical furnace for activation of a carbon fabric and a conjugated with it steam generator, which are connected to the power source and a control unit. And at the furnace output there is a reception device. At that the furnace contains a through heated muffle, through which the treated charcoal-fibrous fabric is continuously passing. At that the muffle is located inside the detachable heat-insulating furnace body, on the inner side of which there are heating elements. Besides at the furnace outlet there is a movable container with water, in which the lower end of the through muffle is dipped. The invention offers an installation for production of activated charcoal-fibrous material, which ensures a continuous process of treatment of the charcoal-fibrous material with an overheated steam and formation of the activated fabric with high mechanical properties and a cellular structure, simple in assembly and reliable in operation.

EFFECT: the invention ensures production of the activated fabric with high mechanical properties and a cellular structure, simple in assembly and reliable in operation.

8 cl, 4 dwg

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