RU2292361C1 - Method of production of the reactant for the bactericidal treatment and dehelmintozation of the sediments of the sewage purification facilities and the method of the bactericidal treatment and dehelmintozation of the sediments of the sewage purification facilities - Google Patents

Abstract

FIELD: municipal sanitary and disinfection services; production of reactants and the methods for bactericidal treatment and dehelmintization of the sediments of the sewage-purification facilities.

SUBSTANCE: the invention is pertaining to the bactericidal treatment and dehelmintization of the sediments of the sewage-purification facilities. Preliminary they determine the length and the width of the sludge drying bed, the space intervals between the insertion points, the depth of the sediment layer, its density, humidity and the specific dose of 1М reactant in terms of the absolutely dry substance of the sediment. The consumption of the reactant solution per one sludge drying site is calculated proceeding from the following mathematical expression:

and consumption the reactant solution per one place of its introduction is calculated proceeding from the mathematical expression:

where

- the consumption of the solution per one sludge drying site, liters;

- the consumption of the reactant solution introduction per one place of introduction, liter; L is the length of the sludge drying site, m; b is the width of the sludge drying site, m; h is the depth of the sediment layer, m;_{_} ρ_{sedim.humidity} is the density of the sediment, kg/m³; W_{humidity of treat.sed.} is humidity of the treated sediment,%; d^spec _{reactant -} specific dose makes 10 mmole of the reactant/kg of the absolutely dry substance of the sediment. The reactant is produced using the water-thermal treatment at presence of the alkali of the wastes containing the animal proteins. The wastes, water and alkali are taken in the ratio of 1:(1.8-2.0):(0.38-0.46), the treatment is conducted at the temperature of 160-180°C for 25-30 minutes. The technical result of the invention is the increased availability of the reactant and the increased efficiency of the treatment of the sediment.

EFFECT: the invention ensures the increased availability of the reactant and the increased efficiency of the treatment of the sediment.

2 cl, 5 ex

Description

The invention relates to bactericidal treatment and deworming of sewage sludge from sewage treatment plants and can find application in the system of housing and communal services of cities and rural settlements.

Sewage sludge from sewage treatment plants, even after biothermal and biological treatment and stored at silt sites of treatment facilities, are a source of biological hazard, since they contain pathogenic microflora and helminth eggs in significant quantities.

There is a method of producing a reagent for bactericidal treatment and deworming of sewage sludge treatment plants, which is an aqueous solution of alkali and copper or zinc complexes of a mixture of amino acids with copper or zinc salts of inorganic acids (Friedman A.Ya. and other Organomineral compositions based on sewage sludge sewage treatment plants. M.: Non-profit partnership "Chemical-technological scientific center", M., 2000, p. 45-61) [1].

However, to obtain the reagent in this known manner, expensive preparations are used - individual amino acids, which reduces the availability of the reagent.

A known method of bactericidal treatment and deworming of sewage treatment plants with water-soluble salts of Ag, Cu, Zn, with high biocidal activity (O.I. Montvilo, V.V. Gutenev. Reducing anthropogenic impact on the environment in water treatment technologies using ionic bacteriostats. Scientific and technical aspects of environmental protection. Overview information. Issue 5, VINITI, M., 2003, p. 85-90) [2].

The disadvantage of this known method is the need to use for disinfection of significant quantities of reagents, which is economically inefficient. In addition, their disinfecting activity is most effective at relatively high temperatures (30 ° C and above).

A known method of bactericidal treatment and deworming of sludge from treatment facilities with a reagent in the form of an aqueous solution of alkali and copper or zinc complexes of hydrates of a mixture of amino acids [1].

However, in this known method, a reagent is used, the conditions for which are not described, and when processing the sludge of treatment facilities with this reagent, the optimal amount of the reagent is not calculated, which leads to either inefficient use of the reagent or its overuse.

The technical result achieved by the present invention is to increase the availability of the reagent for bactericidal treatment and deworming of sludge from wastewater treatment plants, increasing the efficiency of processing by optimizing the consumption of the reagent.

The specified technical result is achieved by the fact that in the method for producing a reagent for bactericidal treatment and deworming of sludge from treatment plants, which is an aqueous solution of alkali and copper or zinc complexes of hydrates of an amino acid mixture, by the interaction of hydrates of sodium or potassium salts of a mixture of amino acids with copper or zinc salts of inorganic acids, a distinctive feature is that for the interaction with copper or zinc salts of inorganic acids I use hydrates of sodium or potassium salts of a mixture of amino acids obtained by water-thermal treatment in the presence of alkali of waste containing animal proteins, and the mixture is treated with said waste with water and alkali, taken in the ratio 1: (1.8-2.0) :( 0.38-0.46), at a temperature of 160-180 ° C for 25-30 minutes.

This technical result is also achieved due to the fact that in the method of bactericidal treatment and deworming of sewage treatment plants with a reagent in the form of an aqueous solution of alkali and copper or zinc complexes of hydrates of a mixture of amino acids for processing, the reagent obtained according to claim 1 is used, and the length and width are preliminarily determined silt site, the distance between the points of entry of the reagent, the depth of the sediment layer, its density, humidity, specific dose of a 1M reagent solution in terms of absolutely dry sediment, the descent of the reagent solution to one sludge pad is calculated based on the mathematical expression:

- расход раствора реагента на одну иловую площадку, л;Where

- flow rate of the reagent solution per sludge pad, l;

l is the length of the silt site, m:

b is the width of the silt site, m;

h is the depth of the sediment layer, m;

ρ _vl . sediment - sediment density, kg / m ³ ;

W _{arr. Sediment} - humidity of the processed sediment,%;

- удельная доза составляет 10 ммоль реагента/кг абсолютно сухого вещества осадка,

- the specific dose is 10 mmol of reagent / kg of absolutely dry substance of the precipitate,

the flow rate of the reagent solution at one place of its input is calculated based on the mathematical expression:

- расход ввода реагента на одно место ввода, л;Where

- consumption of reagent input at one input point, l;

s - distance between entry points, m;

h is the depth of the sediment layer, m;

ρ _{vl. sediment} - the density of the wet sediment, kg / m ³ ;

W _{arr. Sediment} - humidity of the processed sediment,%;

- удельная доза, равная 10 ммоль реагента/кг абсолютно сухого вещества осадка,

- specific dose equal to 10 mmol of reagent / kg of absolutely dry matter of sediment,

and spend the reagent solution in excess of 20-30% relative to the calculated amount.

The following are examples illustrating the invention.

Example 1. In a 250-liter reactor, 108 liters of water are loaded, 22.8 kg of sodium hydroxide is added in 3 kg portions, and then 60 kg of waste containing animal proteins (wet and dry grain collection of fur and leather production, skin sorting waste and substandard fur and leather raw materials, a flap and trimmings not utilized in the manufacture of products from wool, fur and leather), ramming them if necessary. The ratio of waste: water: alkali is 1: 1.8: 0.38. The steam supply valve is opened, the reaction mass is heated until circulation begins through the pipeline supplying to the expansion vessel-refrigerator, and the pipeline returning condensate to the reactor. The process is carried out at a temperature of 160 ° C. When the steam is fully supplied, the mass is kept in a circulated state for 15 minutes. Block the steam supply to the reactor and incubated for 15 minutes after the cessation of circulation. Shake the reactor lid, add water to a total reaction volume of 200 l and mix the mixture for 15 minutes. The reaction mixture is drained through a filter into a decanter. A 2M aqueous hydrolyzate solution is obtained with an average molecular weight of 136 and a free alkali content of 0.08 mol / L.

The obtained hydrolyzate of waste containing animal proteins with a hydrate content of a mixture of sodium salts of a mixture of amino acids (alanine, valine, glycine, leucine, isoleucine, proline, phenylalanane, oxoproline, serine, tyrosine, threonine, arginine, histidine, lysine, oxylysine, cysteine, cysteine, cysteine, cysteine, cysteine, cystine, , methionone, aspartic acid and glutamic acid; average molecular weight 136), equal to 2 mol / L, was loaded in an amount of 40 L into a 200 L tank with a wide open neck, with a lower descent with a crane equipped with a mechanical stirrer. Then, while stirring for 10-15 minutes at a temperature of 18 ° C, 18 kg of copper chloride was added, and then with continuous stirring 4.5 kg of sodium hydroxide (in 300 g portions) for 20-30 minutes. The volume of the reaction mass was adjusted with water to 100 l and stirred for 15 minutes. A sample is taken and a pH of 9.3 is determined. Get 100 l of reagent with a content of complex salts of copper 1 mmol / l and a hydroxyl coefficient of 0.9.

Example 2. In a reactor with a capacity of 250 l, 120 l of water is loaded, 27.6 kg of sodium hydroxide are added in portions of 2 kg and then 60 kg of waste containing animal proteins (tanning leather, substandard fur and leather raw materials), tamping them if necessary . The ratio of waste: water: alkali is 1: 2.0: 0.46. The steam supply valve is opened, the reaction mass is heated until circulation begins through the pipeline supplying steam to the expansion vessel-refrigerator and through the pipeline returning condensate to the reactor. The process is carried out at a temperature of 180 ° C. When the steam is fully supplied, the mass is kept in a circulated state for 15 minutes. Block the steam supply to the reactor and incubated for 10 minutes after the cessation of circulation. Shake the reactor lid, add water to a total reaction volume of 200 l and mix the mixture for 15 minutes. The reaction mixture is drained through a filter into a decanter. Get 2M aqueous reagent solution with an average molecular weight of 136 and a free alkali content of 0.075 mol / L.

The obtained hydrolyzate with a content of sodium hydrates of amino acids (molecular weight 130), equal to 2 mol / l, was loaded in an amount of 50 l into a container with a capacity of 200 l with a wide open neck, with a lower descent with a crane equipped with a mechanical stirrer. Then, with stirring over a period of 20 minutes, 18.5 kg of zinc sulfate was added, followed by continuous stirring of 4.5 kg of sodium hydroxide (in 200 g portions) over 45 minutes. The volume of the reaction mass was adjusted with water to 100 l and stirred for 15 minutes. A sample is taken and a pH of 9.9 is determined. Get 100 l of reagent with complex zinc salts of 1.1 mmol / l and a hydroxyl ratio of 0.95.

Example 3. In a 250-liter reactor, 124 liters of water are loaded, 24.8 kg of potassium hydroxide are added in 2 kg portions and then 62 kg of waste containing animal proteins (hair tows of cloth-felting production), tamping them if necessary. The steam supply valve is opened, the reaction mass is heated until circulation begins through the pipeline supplying steam to the expansion vessel-refrigerator, and through the pipeline returning condensate to the reaction vessel. The process is carried out at a temperature of 180 ° C. The ratio of raw materials: water: alkali is 1: 2.0: 0.40. With a full steam supply, the mass is kept in a circulated state for 15 minutes. The steam supply to the reactor is shut off and held for 10 minutes after the circulation is stopped. Shake the reactor lid, add 85 L of water (to a total reaction volume of 200 L) and mix for 15 minutes. The reaction mixture is drained through a filter into a decanter. A 2M aqueous hydrolyzate solution is obtained with an average molecular weight of 129 and a free alkali content of 0.05 mol / L.

The resulting alkaline hydrolysis product of hair tows of cloth-felting production containing sodium hydrates of a mixture of amino acids (alanine, valine, glycine, leucine, isoleucine, proline, phenylalanane, oxoproline, serine, tyrosine, threonine, arginine, histidine, lysine, oxiliz cystine, methionone, aspartic acid and glutamic acid; average molecular weight 132), equal to 2 mol / l, was loaded in an amount of 50 l into a container with a capacity of 200 l with a wide open neck, with a lower descent with a tap, equipped with a stirrer. Then, with stirring over 15 minutes, 18.0 kg of copper nitrate and 6 kg of potassium hydroxide (in 300 g portions) were added over 45 minutes. The volume of the reaction mass was adjusted with water to 100 l and stirred for 15 minutes. A sample is taken and a pH of 10.5 is determined. Get 100 l of reagent with a content of complex salts of copper 1.15 mmol / l and a hydroxyl coefficient of 0.95.

Example 4. The sludge of treatment facilities, placed on a sludge map with a moisture content of 67% in an amount of 100 tons (separated part of the sludge map), was processed directly on the sludge site by introducing reagents into the sludge mass using a distribution system. Total microbial contamination - 10 ⁷ -10 ⁹ . Viable helminth eggs - 40-50 pcs./kg.

A solution of the bactericidal reagent (1 M aqueous solution of complexes of copper salts and a mixture of amino acid hydrates with a molecular weight of 135, a copper salt content of 1.2 mmol / L and a hydroxyl coefficient of 0.97) is transported to the sludge sites in a reagent tank installed on a mobile platform, and the pump through a distribution system equipped with shutoff valves, is pumped to the sludge site in the feeding devices installed according to the ordinary scheme at a distance of 1.5-1.8 m under a pressure of 2.5 atm.

Sludge treatment plants treatment was carried out after the following measurements were performed: l = 10 m, b = 10 m, h = 1 m, ρ _waterfall = 1.2 kg / m ³ , W = 67%,

In accordance with the calculations made, the treatment required 645 L (20% excess) of a 1M reagent solution. The treatment was carried out for 15 hours. After exposure for 15 days, the pH of the treated precipitate reached a constant level of 7.6-7.8 units. According to bacteriological and parasitological analysis and biotesting (according to Order of the RF Ministry of Natural Resources dated June 15, 2001 No. 511), the resulting organomineral composition is non-toxic to living organisms, does not contain pathogenic microflora and viable helminth eggs, and is a substance of hazard class 4.

Example 5. The sludge of treatment facilities, placed on a sludge map with a moisture content of 62% in an amount of 100 tons (the allocated part of the sludge map), was processed directly on the sludge site by introducing reagents into the sludge mass using a distribution system. Total microbial contamination - 10 ⁶ -10 ⁷ . Viable helminth eggs - 30-45 pcs./kg.

A solution of the bactericidal reagent (1 M aqueous solution of zinc complexes of a mixture of amino acid hydrates with a molecular weight of 140, a content of zinc salts of 1.7 mmol / L and a hydroxyl ratio of 1.3) is transported to the sludge sites in a reagent tank installed on a mobile platform, and the pump a distribution system equipped with shut-off valves is pumped to the sludge platform into the feeding devices installed according to the ordinary scheme at a distance of 1.6 m under a pressure of 2.5 atm.

Sludge treatment plant treatment was carried out after the following measurements were performed: l = 10 m, b = 10 m, h = 1 m, ρ _waterfall = 1.2 kg / m ³ , W = 62%,

In accordance with the calculations made for the treatment, 638 L of a 1M reagent solution was required. The treatment was carried out for 8 hours. After exposure for 15 days, the pH of the treated precipitate reached a constant level of 7.6-7.8 units. According to bacteriological and parasitological analysis and biotesting (according to Order of the RF Ministry of Natural Resources dated June 15, 2001 No. 511), the resulting organomineral composition is non-toxic to living organisms, does not contain pathogenic microflora and viable helminth eggs, and is a substance of hazard class 4.

Thus, the invention allows to obtain an affordable reagent for bactericidal treatment and deworming of sludge from treatment facilities. The reagent provides high processing efficiency for these sediments.

Claims (2)

1. A method of obtaining a reagent for bactericidal treatment and deworming of sewage treatment plants, which is an aqueous solution of alkali and copper or zinc complexes of hydrates of a mixture of amino acids, by interacting hydrates of sodium or potassium salts of a mixture of amino acids with copper or zinc salts of inorganic acids, characterized in that for interaction with copper or zinc salts of inorganic acids use hydrates of sodium or potassium salts of a mixture of amino acids obtained by heat treatment in the presence of alkali waste containing animal proteins, and the treatment is subjected to a mixture of the waste with water and alkali, taken in the ratio 1: (1.8-2.0) :( 0.38-0.46), at a temperature of 160-180 ° C for 25-30 minutes 2. The method of bactericidal treatment and deworming of sediments of treatment facilities with a reagent in the form of an aqueous solution of alkali and copper or zinc complexes of hydrates of a mixture of amino acids, characterized in that the reagent obtained according to claim 1 is used for processing, and the length and width of the sludge platform, the distance are preliminarily determined between the reagent entry points, the depth of the sediment layer, its density, humidity, the specific dose of a 1M reagent solution, calculated on the absolutely dry substance of the sediment, the flow rate of the reagent solution per sludge pad calculated on the basis of a mathematical expression:

Where

- flow rate of the reagent solution per sludge pad, l; l is the length of the silt site, m: b is the width of the silt site, m; h is the depth of the sediment layer, m; ρ _vl . sediment - sediment density, kg / m ³ ; W _{arr. Sediment} - humidity of the processed sediment,%;

- the specific dose is 10 mmol of reagent / kg of absolutely dry substance of the precipitate, the flow rate of the reagent solution at one place of its input is calculated based on the mathematical expression:

Where

- consumption of reagent input at one input point, l; s - distance between entry points, m; h is the depth of the sediment layer, m; ρ _{vl. sediment} - the density of the wet sediment, kg / m ³ ; W _{arr. Sediment} - humidity of the processed sediment,%;

- the specific dose is 10 mmol of reagent / kg of absolutely dry substance of the precipitate, and spend the reagent solution in excess of 20-30% relative to the calculated amount.