Adsorbent of compound action, method of its obtainment and recovery

FIELD: technological processes.

SUBSTANCE: invention concerns environmental protection, particularly adsorbent of compound action suitable for obtaining filtering material for both fine sewage purification and complex treatment of exhausted mineral oil. Adsorbent of compound action is obtained by mixing thermal power plant burnout with mineral sediment based on iron oxide-hydroxide extracted at ground water deferrisation plants, and undergoes thermal processing within 180-350°C interval for 3-6 hours. After oil treatment the adsorbent is recovered by heating at 300-350°C for 4-5 hours.

EFFECT: obtaining adsorbent of compound action suitable for both sewage treatment and complex treatment of exhausted mineral oils, from waste.

3 cl, 6 ex, 2 tbl

 

The invention relates to the solution of problems of environmental protection and concerns primarily the adsorbent complex action, suitable for receiving the filter material for advanced wastewater treatment and integrated treatment of waste mineral oils from pollutants, based on adsorption technology using natural and synthetic adsorbents and adsorbent obtained by recycling various industries. For example, it is known the use of sparsely (aluminosilicate microspheres) for sorbent impregnated with oil, followed by burning, for water purification from oil and oil products (EN 2090258). Know the use of basalt fiber for water purification from oil (Industrial engineering and engineering structures", 1991, No. 4, p.34).

However, the proposed technical solutions are not effective for complex and deep cleaning of waste and commercial water from oil and other pollutants, such as phenols, are almost always present in the oily waste waters of different origin.

Proposed various methods of sewage treatment from phenols, which are combined in one process scheme using chemical, adsorption and solvent extraction methods. Proposed adsorbent (EN 94028265, 1996), carbon fiber material for adsorption of phenol. Desorption of phenol is proposed to carry out the extraction with acetone and ethyl acetate.

Known (RU 93017949, 1995) purification method fenolosoderzhaschikh water by sequential processing of water in diaphragm electrolysis and then in the adsorption filter. Most of the proposed methods for waste water purification from phenol multistage, complex technological design and not suitable for a comprehensive treatment of wastewater from various pollutants, for example simultaneously from phenols and petroleum products.

The second important point of the proposed adsorbent is used for purification of waste mineral oils.

When operating in mineral oils of various grades collects the products of chemical reactions, which contaminate the oil and reduce their operational properties. In oils, resinous substances, soot, water, acid components and other impurities.

Proposed currently a huge number of ways to clean oils, most often to remove any one of the pollutants.

In the patent RU 2242498, 2004 proposed method of recovery of flooded oil filtration through the adsorbent containing basalt fiber, urea (clay). In patent SU 1011235, 1983, serves to clean the oil from VSUES is the R particles by filtration through a material, containing powder Haskanita, perlite and basalt fiber.

In the patent RU 224504 serves to purify the oil by filtration through a filter containing the adsorbent - sand impregnated with sulfuric acid.

The drawback of the proposed methods is unsatisfactory degree of purification of the oils. To improve the efficiency of oily wastewater or waste mineral oils are encouraged to use the adsorbent, containing in its composition sparselu and heat-treated mineral sludge produced at the water treatment plants at the stage of removal of iron from groundwater (waste production). In the mineral composition of the sediment consists of oxide-hydroxides (98-99%) and compounds of divalent metals CA, Mg, Ba ("the Composition of mineral growths on water withdrawals from groundwater sources", Pokrovsky D.S., "Izvestiya vuzov", "Building", 2002, No. 3, S. 13-21).

In the present invention is mineral waste is crushed, proseat through a sieve with a mesh size of 0.3-0.5 mm and heated in a furnace at a temperature of 120-350°C for 3-5 hours. The resulting powder was FeOOH (OGG), brown, mixed with ash from power plants in the ratio of 1:(1-2) and used for the manufacture of filter material, which is additionally used fibrous material: polypropylene and/or basalt fiber is O.

Ash of thermal power plants is a gray powder composed of hollow spherical particles ranging in size from 50 to 500 μm, which are formed in the composition of the fly ash at high temperature flare burning coal. The present invention was used commodity ash Novosibirsk TPP on THE 5717-001-11843486-2004. The composition of the ash, wt.%: SiO2- 65-66; Al2About3- 20-21; Fe2About3- 3.1-4.6; CaO - 1.8-2.7; MgO - 1.9-2.2; Na2O - 0.3-0.6; K2O - 1.9-2.9; TiO2- 0.2-0.6. The bulk density of 0.4-0.5 g/cm3.

The hallmark of the inventive adsorbent is used as the source material waste stations ground water deferrization and ash of thermal power plants. The second distinguishing feature is the activation of mineral sediment - oxide-hydroxide of iron by heating at a temperature of from 120°With up to 350°C. the loss of weight up to 30% and the powder retains its amorphous structure. Activation can be carried out by heating a mixture of ash mineral precipitate the oxide-hydroxide of iron.

Example 1. Treatment of waste water.

Waste water containing 30 mg/l mineral oil, 15 mg/l phenol, filtered through the adsorbent composition of ash:oxide-hydroxide of iron (OGG) 1:1, heated at a temperature of 120°C for three hours. The height of the layer of adsorbent 25 see the Degree of purification from phenol - 10%, not the products of 95%. The results of the samples are presented in table 1.

Example 2. Purification turbine oil.

In a column Packed with adsorbent (ash:OGI 1:1), height 20 cm serves prepared oil. Obtained after filtration of the oil is light, transparent, analyze the content of acid components and water. The results of the samples are presented in table 2.

Example 3. Cleaning of industrial oils.

Analogously to example 2 purified industrial oil. The results of the samples are presented in table 2.

Example 4.

The adsorbent after cleaning the oil recovered by annealing at a temperature of 300-350°C for 4-5 hours and re-use. The results of the samples are presented in table 2.

Example 5.

Sediment OGG heated at a temperature of 300°C for 4 hours, mixed with ash in the ratio of 1:1 and purified water, as in example 1. The degree of purification from phenol 97%, from oil 99%.

Example 6.

The adsorbent containing OGG and ash in the ratio of 1:1, heated at a temperature of 300°C for 5 hours and used for water purification as described in example 1. The degree of purification from phenol 98%, from petroleum products 98%.

Table 1.

The degree of waste water from the ratio between the ash and the oxide-hydroxide of iron (OGG), activated at different temperatures.
No. sampleThe ratio of components, wt.The processing temperatures of the adsorbent, °The degree of purification, %
NWOGGOilPhenol
1111209510
2111509625
3112509895
4113009997
51,513009996
6213009995

Table 2.

Results purification of oils.
No. sampleWaste oilThe ratio of components, weight, temperature treatment, °Indicators of the quality of the refined oil
NWOGGAcid number, mg KOH per 1 g of oil Content. waterColor
1Turbine, the acid content of 0.08%, brown, muddy11 (250°)No.No.Transparent, bright.
2Industrial, brown, muddy11 (300°)0,019No.Transparent, bright.
3Industrial, brown, muddy11 after regeneration0,009No.Transparent, bright.

1. The method of producing adsorbent complex actions, including the mixing of the ash of thermal power plants with sludge containing oxide-hydroxide of iron, characterized in that the mixing serves mineral residue allocated to stations ground water deferrization in the amount of 1 parts by weight referred to the sediment at 1-2 parts by weight of ash, with or referred to the sediment, or the mixture of sludge with ash subjected to heat treatment at 120-350°C for 3-5 hours

2. The adsorbent complex action on the basis of a mixture of fly ash of thermal power stations with sediment oxide-hydroxide of iron, characterized in that it is obtained by the method described in claim 1.

3. Method of regeneration of the adsorbent, characte savannaha in section 2 and used for the purification of oils, lies in its heated at 300 to 350°C for 4-5 hours



 

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1 tbl

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1 tbl, 5 ex

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2 tbl, 9 ex

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