RU129016U1 - FILTER FOR THE CATALYTIC PURIFICATION OF NATURAL AND SEWAGE FROM ORGANIC POLLUTION - Google Patents

Abstract

1. A filter for the catalytic treatment of natural and wastewater from organic contaminants, including a tank, a system for supplying and discharging treated water, a support layer and a filter charge made of a metal complex catalyst, characterized in that the aeration system in the form of perforated pipes is located in the support layer, moreover, the catalyst contains 40-50 wt.% tailings tailings mining and processing plant, 1-5 wt.% sawdust, the rest is bentonite. 2. The filter according to claim 1, characterized in that the catalyst is made in the form of spherical particles with a diameter of 3-10 mm

Description

The filter is intended for the purification of natural and wastewater from difficultly oxidized dissolved organic substances, can be used in the public water supply system, as well as for the treatment of industrial wastewater.

A known method of wastewater treatment from persistent organic substances by oxygen enrichment of purified water and filtering in granular pyrolusite, which has catalytic properties (Patent SU 1244105).

The disadvantage of this method is the high cost of pyrolusite, low mechanical strength.

A known installation of water treatment, including a filter for mechanical treatment, a device for saturating water with a gaseous oxidizing agent, a filter unit with adsorption and catalytic loading, a filter unit with sorption loading, a disinfection system. The catalytic loading is made in the form of a catalyst composition based on divalent manganese oxide subjected to modifying treatment with potassium permanganate (RU Patent PM 30741).

The water treatment plant is complex, it uses catalytic and sorption materials of high cost.

Closest to the claimed object is a filter for the catalytic treatment of natural and wastewater from pollution, including a tank, a system for supplying and discharging treated water, a support layer, a two-layer filtering charge, the two-layer loading consisting of a metal complex catalyst and sand (RU Patent ПМ 47248 )

The disadvantage of the filter is that it is loaded with catalytic material having a high cost.

The objective of the utility model is to reduce the cost of manufacturing and operating the filter.

The problem is solved in that in the filter for the catalytic treatment of natural and wastewater from organic contaminants, including a tank, a system for supplying and discharging treated water, a support layer and a filter load made of a metal complex catalyst, in accordance with a utility model, the filter support layer is located aeration system in the form of perforated pipes, and the catalyst contains 40-50% wt. tailings tailings mining and processing plant, 1-5% of the mass. sawdust, the rest is bentonite. The catalyst is made in the form of spherical particles with a diameter of 3-10 mm.

The figure 1 shows a drawing of a filter.

The filter comprises a housing 1 having a supply pipe 2 and a water outlet 3, a pipe 4 for supplying a washing water and a pipe 5 for removing the wash water. In the filter housing 1 there is a lower drainage system 6 made of perforated pipes located in a support layer 7 made of gravel. In the supporting layer 7 is placed an aeration system 8 made of perforated pipes. In the upper part of the housing 1 there is a groove 9 for collecting washing water. In the filter housing 1 there is a filter load 10 made of a metal complex catalyst containing 40-50% wt. tailings tailings mining and processing plant, 1-5% of the mass. sawdust, the rest is bentonite. The catalyst is made in the form of spherical particles with a diameter of 3-10 mm.

The principle of operation of the filter is as follows. Any natural water contains dissolved organic substances of natural or technogenic origin, the concentration of which is determined by the indicators of permanganate or bichromate oxidation. Permanganate oxidation of drinking water should not exceed 5 mg / L. The concentration of dissolved organic substances in wastewater is determined by the BOD (biological oxygen consumption) and COD (chemical oxygen consumption) indicators, which are normalized in the treated wastewater discharged into water bodies. COD is always higher than BOD, which indicates the content of hardly oxidizable organic substances in wastewater, usually of technogenic origin. The content of hardly oxidizable organic substances always causes technological problems in their recovery.

The purified water is supplied to the filter through the pipe 2 of the water supply, is filtered in the catalytic load 10 in the direction from top to bottom. Using the aeration system 8, air is supplied to the water, the oxygen of which is an oxidizing agent. However, the bubbling of water containing dissolved organic substances by air does not lead to water purification. The oxidizing power of oxygen increases significantly at the interface between water, air and solid catalyst. As the catalyst used granular material obtained from waste from the mining and processing plant, namely, tailings. The activity of the catalyst is provided by the content of iron, aluminum, zinc, copper, titanium, magnesium. The oxidation of organic substances occurs before the formation of carbon dioxide and water. The effect of water treatment depends on the filtration rate, which is determined empirically.

Any natural or waste water contains suspended solids that are extracted during the filtering process. The regeneration of the filter is carried out by the reverse water flow using the pipe 4 and the drainage system 6. The washing water is removed by the chute 9.

The proposed filter is designed specifically for the oxidation of difficultly oxidized organic substances with atmospheric oxygen in the presence of a catalyst. As raw materials for the preparation of the catalyst, tailings from the tailings of the Uchalinsky mining and processing plant were used, the composition of which is given in table 1.

Table 1 The composition of the tailings from the tailings of the Uchalinsky GOK Component The content of the component in the waste,% Iron 38,0 Aluminum 3.0 Silicon 8.0 Zinc 4.0 Copper 0.9 Titanium 0.3 Magnesium 1.7 Sulfur 35.9 Sodium 5,4 Calcium 2,8 TOTAL one hundred

The composition of the catalyst introduced tailings in a concentration of 20-60% wt., Sawdust in a concentration of 1-15% wt. and bentonite - the rest. After mixing the dry mass, water was added to the mixture until a plastic mass was obtained by stirring. After molding, the spherical-shaped granules were dried naturally and fired in furnaces at a temperature of 700-800 ° C for 2 hours. The granule size was varied in the range of 3-10 mm.

Example 1. Conducted experiments on the purification of drinking water containing hardly oxidizable organic substances. An organic dye, methylene blue, recommended as an indicator according to GOST 4453-71, was used as a pollutant. The change in the dye concentration was measured by determining the optical density on a FEK-56M photoelectron colorimeter.

AOK-7541 alumina-manganese catalyst was used as a reference catalyst, manufactured on an industrial scale by the Novosibirsk plant of JSC Catalyst according to TU 6-68-197-2004.

The initial value of the optical density of the methylene blue solution is 0.6. The solution was filtered in a catalytic loading of the filter at a speed in the range of 4-20 m / h. Air was supplied using a compressor with a flow rate of 0.25 m ³ / h. The content of tails in the catalytic loading was 40% wt., The content of sawdust from 1 to 15% of the mass.

table 2 The results of determining the optical density of the filtrate Catalyst Filtration rate, m / h four 5 7 10 fourteen twenty AOK-7541 0.15 0.17 0.23 0.30 0.41 0.49 According to a utility model, the concentration of sawdust,% wt .: one 0.05 0.06 0.08 0.14 0.21 0.31 3 0,03 0.04 0.06 0.12 0.18 0.27 5 0,07 0.08 0.12 0.17 0.26 0.35 fifteen 0.13 0.15 0.18 0.24 0.32 0.40

From table 2 it follows that the activity of the proposed catalyst is higher than that of the reference AOK-7541. The best results were obtained using a catalyst with a sawdust content of from 1 to 5% wt. The optimum value for the filtration rate is 4-7 m / h.

Example 2. Conducted experiments on the purification of industrial wastewater of a dairy plant. The initial COD value was 1860 mg / L. The filtration rate is 7 m / h, the air flow rate is 0.25 m ³ / h. The content of sawdust in the catalytic loading is 3% wt., The content of tails is 20-60% wt.

The results of the determination of COD in the filtrate are shown in table 3.

Table 3 COD of the filtrate, mg / l The content of the tails in the catalyst,% mass. twenty thirty 40 fifty 60 COD, mg / l 410 160 70 60 180

From table 3 it follows that a greater effect of wastewater treatment is achieved when the content in the catalytic load of 40-50% wt. tailings from the tailings of the mining and processing plant.

Claims (2)

1. A filter for the catalytic treatment of natural and wastewater from organic contaminants, including a tank, a system for supplying and discharging treated water, a support layer and a filter charge made of a metal complex catalyst, characterized in that the aeration system in the form of perforated pipes is located in the support layer, moreover, the catalyst contains 40-50 wt.% tailings tailings mining and processing plant, 1-5 wt.% sawdust, the rest is bentonite. 2. The filter according to claim 1, characterized in that the catalyst is made in the form of spherical particles with a diameter of 3-10 mm

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