Sorbent catalyst for cleaning water to remove manganese

FIELD: water treatment.

SUBSTANCE: sorbent catalyst appropriate to produce drinking water contains, as carrier, filter material (ODM-2F), ground opokas with summary pore volume 0.45-0.55 cm3/g (98.0-99.5%) and manganese dioxide (0.5-2.0%). Sorption capacity of sorbent catalyst exceeds that of quartz sand-based "black sand" by a factor above 1.5.

EFFECT: increased sorption capacity.

1 tbl, 4 ex

 

The present invention relates to sorbents-catalysts and can be used for purification of natural waters from compounds of manganese for drinking water.

According to the requirements of SanPiN 2.1.4.1074-01 "drinking Water" concentration of manganese in the water for domestic and drinking purposes should not exceed 0.1 mg/l, because of its toxic effect on the human body.

Known filter material for water purification from iron and manganese [1], including processed dolomite coated with manganese oxide. This filter material has a relatively low sorption-catalytic ability manganese, and when the content of manganese in water is 1.5 mg/l of source water to the sanitary norms only with additional introduction in the treated water of oxidizing agents, oxygen, potassium permanganate, sodium hypochlorite, ozone.

The closest in technical essence and the achieved to the claimed effect is "black sand", which is a quartz sand, covered with a film of oxide of manganese [2, 3].

According to [2] a method of obtaining a "black sand" is in the processing of quartz sand with a solution of potassium permanganate, which podslushivaet to pH 9 with an aqueous solution of ammonia. For the formation of a solid catalytic film of manganese dioxide in contact sand with reagents must be done the day with subsequent washing of the sorbent-catalyst from excess salts.

In accordance with [3] "black sand" receive serial processing of silica sand with 0.5% solution of chloride of manganese and potassium permanganate. For applying the maximum possible amount of manganese dioxide on the surface of the sand (0.5%) required 7-fold processing impregnating solutions, which is a rather time consuming process.

The effectiveness of the "black sand" is insufficient in water treatment for manganese at concentrations in water of more than 0.5 mg/L.

When creating a sorbent-catalyst was intended to improve its sorption-catalytic ability when cleaning water from manganese, which will increase the duration of the cycle and reduce the complexity in manufacturing.

This object is achieved in that the sorbent-catalyst for purification of water from manganese, incorporating media and catalytic additive in the form of manganese dioxide, characterized in that as the media it contains filtering material ODM-2F - moulding boxes crushed modified with a total pore volume of 0.45-0.55 and cm3/g in the following ratio, wt.%:

moulding boxes crushed modified98,0-99,5
manganese dioxide0.5 to 2.0.

The source material for obtaining f is Trouser material ODM-2F are gaize - dense rock, having the following approximate composition: 75-90% of silicon dioxide, 1,5-9% of aluminum oxide, the rest of the oxides of iron, calcium, magnesium and others [4]. The choice ODM-2F as the filter material due to the optimal combination of its high technical and operational characteristics (developed porous structure, mechanical strength), available resources and cost comparable to the cost of quartz sand - fundamentals of material prototype.

Unlike the prototype is that as the carrier of the sorbent-catalyst used filter material ODM-2F, made by THE 2164-001-47669880-97.

Filtermaterial ODM-2F has a porous structure with a total pore volume of 0.45-0.55 and cm3/g and a specific surface area by BET, equal 40-42 m2/, printed on the surface of ODM-2F manganese dioxide is able to more effectively oxidize the divalent manganese to insoluble compounds of Mn4+and Mn3+held by the surface of the adsorbent-catalyst. When using sorbent-catalyst filter for water purification of these compounds is removed countercurrent washing of the filter. Strongly adsorbed products of the oxidation of divalent manganese are removed from the surface of the sorbent-catalyst with its periodic regeneration.

Increased litter is largely catalytic ability for manganese is achieved by the media sorbent-catalyst ODM-2F with a total pore volume of 0.45-0.55 and cm3/g has developed specific surface area by BET 40-42 m3/g and the surface of mesopores 35-36 m3/, this provides a uniform and optimal distribution of catalyst additives manganese dioxide on the surface and in the pores of the support that leads to full participation manganese dioxide in processes of oxidation and sorption products of oxidation of Mn2+, and hence to increase the sorption-catalytic activity of the sorbent-catalyst.

The inventive sorbent-catalyst for purification of water from compounds of manganese was prepared as follows.

In the column with mesh bottom-sectional area of 12 cm2downloaded 175 cm3ODM-2F fraction of 0.7-1.6 mm, was filled in 100 ml of a solution of chloride of manganese, kept for 30-60 min, then the excess of manganese chloride was decanted and through the layer of moistened ODM-2F was pumped by pump reverse current (bottom-up) potassium permanganate solution with a linear speed of 5 m/h Volume of the pumped solution of 350 cm3i.e. equal to 2 times the volume loaded into the column material ODM-2F. Then allowed to drain residual potassium permanganate solution and the layer of the obtained sorbent-catalyst was rinsed with water from the remnants of potassium permanganate and an excess of manganese dioxide is not associated with the surface of the carrier,to clean water, not containing compounds manganese.

By changing the concentration of the impregnating solution of chloride of manganese and increasing the number of impregnations, you can get sorbent-catalyst with a manganese content of from 0.5 to 2.0 wt.%.

The obtained sorbent-catalyst carried out the treatment of ground water containing 1.5 mg/l of divalent manganese.

For this purpose, the purified water with the concentration of manganese 1.5 mg/l was passed down through the layer of sorbent-catalyst loaded in the sorption column under the following conditions:

the filtration rate of 10 m/h; the cross-sectional area of the column is 12 cm2; the height of the layer of sorbent-catalyst 0,9 m

Cleaning led until after layer of sorbent-catalyst maximum allowable concentration /MPC/ manganese - 0.1 mg/l Time from start cleaning until after layer of sorbent-catalyst MPC manganese was determined as the time of its protective action on manganese.

Example 1. For sorbent-catalyst took ODM-2F with a total pore volume of 0.45 cm3/g, specific surface according to BET of 40 m2/g, was impregnated with 2.5% solution of manganese chloride and treated with 0.5% potassium permanganate solution above described method. Got sorbent-catalyst of the following composition.

ODM-2F - 95%; Mn - 0.5%; the water was 4.5%.

This sorbent-catalyst cleaning water from divalent manganese and got the following results:

the time of the protective action of the layer of sorbent-catalyst 31 h, the specific sorption capacity for manganese - 0.6 g/l

Example 2. Used for sorbent-catalyst - ODM-2F with a total pore volume of 0.5 cm3/g, specific surface according to BET of 41.7 m2/g, impregnating solutions: chloride manganese - 5,0%, potassium permanganate 0.5 percent.

The resulting sorbent-catalyst has the following composition.

ODM-2F - 94%; Mn -1%; water - 5%.

Time of protective action of a layer of a sorbent-catalyst 90 h, the specific sorption capacity for manganese - 1.5 g/L.

Example 3. Sorbent-catalyst obtained analogously to example 2, but 2-fold processing ODM-2F impregnating solutions.

The composition of the sorbent-catalyst:

ODM-2F - 93,5%; Mn - 2,0%; water - 4,5%.

Time of protective action of a layer of a sorbent-catalyst - 126 h, specific sorption capacity for manganese - 2.1 g/l

Example 4. Used ODM-2F with a total volume of pores

0,55 cm3/g, specific surface area by BET 42,5 m2/g, the concentration of the impregnating solutions of chloride of manganese - 5,0%, potassium permanganate 0.5 percent.

The composition of the sorbent-catalyst:

ODM-2F - 94,5%; Mn -1,2%; water - 4,3%.

Time of protective action of the sorbent-catalyst 98 h, specific sorption capacity for manganese - 1.6 g/L.

The table shows the results of experiments on the purification of water from compounds of divalent manganese with the aid of the completion of the proposed sorbent-catalyst and famous (prototype), carried out in the same conditions.

Table
№№ p/pSum. pore volume ODM-2F, cm3/gThe specific surface price on BET m2/gQty profit. cyclesContent. Mn in the sorbent, wt.%The time of protection. steps in the layer of 0.9 m, hSorb. capacity, g/l
10,4540,010,5310,53
20,5041,711,0901,5
30,5041,722,01262,1
40,5542,511,2981,6
The placeholderLess than 0.170,5190,31

As can be seen from the table, the inventive sorbent-catalyst has a higher sorption capacity for manganese than the prototype that allows to increase the duration of the purification cycle, and thus to reduce the consumption of sorbent-catalyst. The manufacture of a sorbent requires less time by reducing to the icesta reagents and impregnations, which is economically more advantageous.

Sources of information

1. RF patent 2162737, IPC B 01 J 20/02, 20/06, B 01 D 39/02, 26.07.2000,

2. Kul L.A. Theoretical foundations and techniques of conditioning water. Kiev: Naukova Dumka, 1983. S.

3. The frog B.N., Levchenko A.P. Water treatment: textbook for universities. M.: Izd. Moscow state University, 1996. S.

4. Calcev NV Fundamentals of adsorption technique. M.: Chemistry, 1984. P.113-114.

Sorbent-catalyst for purification of water from manganese, incorporating media and catalytic additive in the form of manganese dioxide, characterized in that as the carrier sorbent-catalyst contains filter material ODM-2F - moulding boxes crushed modified with a total pore volume of 0.45-0.55 and cm3/g in the following ratio, wt.%:

Moulding boxes crushed modified98,0-99,5
Manganese dioxide0,5-2,0



 

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