RU2426713C1 - Method for production of organo-mineral fertiliser - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: method includes detoxication of waste water residue with a humic reagent taken in amount from 0.3 wt % to 10.0 wt % per dry substance of waste water residue. Additionally the product of waste water residue detoxication with humic reagent is treated with a preparation of biologically active microorganisms taken in amount from 0.05 l to 1.00 l per ton of dry substance of waste water residue.

EFFECT: invention will make it possible to increase efficiency of method for production of organo-mineral fertiliser due to reduction of content of inorganic and organic toxicants in it, and due to their additional disinfection, to stabilise used residue of waste water, to eliminate rotting and unpleasant odour.

6 tbl, 2 ex

Description

The invention relates to methods for organic fertilizers from sewage sludge obtained in the process of wastewater treatment in biological sewage treatment plants.

Wastewater sludge - a solid fraction of wastewater, consisting of organic and mineral substances separated in the wastewater treatment by sedimentation method (crude sludge), and a complex of microorganisms involved in the biological wastewater treatment and removed from the process (excess activated sludge) . Obviously, due to the large volumes of generated sewage sludge (WWS), the problem of their neutralization should be addressed simultaneously with the issues of using and / or disposal of neutralization products.

A known method of detoxification and disposal of sewage sludge / RF Patent №2125039, publ. January 20, 2009 / using humic concentrate obtained by electrochemical method from natural humites and caustobiolites of the coal series. Moreover, for the detoxification of WWS, a humic concentrate in an amount of about 0.1 to 10.0 wt.% Is mixed with sewage sludge, after which they are applied to the field as a humus-filled organic-mineral fertilizer once every four to five years.

The known method for producing organic fertilizer is not effective enough, since the detoxification of WWS according to the prototype leads to the binding of mainly heavy metal ions, while the risk of exposure of the sewage sludge to the natural environment also lies in the fact that they contain, in addition to salts of heavy metals, organic toxicants, pathogenic microflora, helminth eggs.

Accordingly, the non-disinfected humified organic fertilizer obtained by the prototype method does not meet the environmental protection requirements, including its sanitary-bacteriological and parasitological parameters (GOST R 17.4.3.07-2001); its applicability as a fertilizer only once every four to five years equates it in fact to sewage sludge without any treatment (SanPiN 2.1.7.573-96 “Hygienic requirements for the use of sewage and its sludge for irrigation and fertilizer”).

The problem to be solved and the expected technical result are to increase the efficiency of the method for producing organic fertilizer by reducing the content of inorganic and organic toxicants in it, as well as due to their additional disinfection. An additional advantage of the resulting organomineral fertilizer is the stabilization of the treated sewage sludge used as such an organomineral fertilizer; accordingly, it does not decay and does not emit an unpleasant odor.

The problem is solved in that the method of producing organic fertilizer by detoxification of sewage sludge with a humic reagent, taken in an amount of from 0.3 to 10.0 wt.% Per dry matter of sewage sludge, is characterized in that it additionally detoxifies the sewage sludge with humic the reagent is treated with a preparation of biologically active microorganisms taken in an amount of from 0.05 to 1.00 l per ton of dry matter of sewage sludge.

When using a humic reagent in an amount of less than 0.3 wt.%, And a preparation of biologically active microorganisms - in an amount of less than 0.05 l per ton of dry matter of sewage sludge, the effectiveness of stabilization, detoxification and neutralization of sewage sludge and, accordingly, obtained fertilizers. The use of a humic reagent in an amount of more than 10.0 wt.%, And the preparation of biologically active microorganisms in an amount of more than 1.00 l per ton of dry matter of sewage sludge is economically disadvantageous, since further stabilization, detoxification and neutralization of sewage sludge and, accordingly, the resulting fertilizer is not observed.

The authors are aware of the technology of using preparations of biologically active microorganisms for combating pathogenic microorganisms and helminths of organic waste from animal husbandry and poultry farming, for example, a method of disinfecting pathogenic microorganisms and helminths of organic waste from animal husbandry and poultry farming by using a suspension of the Actinomyces fradiae strain / Patent RF No. 2298031, publ. 04/27/2007 /. However, the authors of the proposed technology for the disposal of WWS to obtain organomineral fertilizer also revealed new properties of biologically active microorganisms, namely, the properties of a consortium of microorganisms not only to disinfect sewage sludge from pathogenic microflora and helminth eggs, but also to participate in the processes of disposal of WWS from inorganic toxicants - salts of heavy metals and organic toxicants - petroleum hydrocarbons, petroleum products, benz (a) pyrene. In this case, according to the authors, the properties of microorganisms manifest themselves on organometallic compounds, in this case obtained as a result of preliminary treatment of WWS with a humic reagent.

The proposed method provides the production of organomineral fertilizer corresponding to sanitary-bacteriological and parasitological indicators - indicators of the presence / absence of pathogenic microflora, helminth eggs - as well as the content of organic and inorganic toxicants - environmental protection requirements (GOST R 17.4.3.07-2001); the resulting organic fertilizer is stabilized: it does not decay and does not produce an unpleasant odor.

The reagents used are natural for the environment, do not form toxic compounds in soil and water, do not pollute the atmosphere, and do not adversely affect the flora, fauna and biogeocenosis in general, even when using high doses.

The method of obtaining organic fertilizer is carried out by the following sequence of operations:

1) detoxification of WWS with its treatment with a humic reagent in an amount of from 0.3 to 10 wt.% On the dry matter of WWS with stirring;

2) treatment of the product of the detoxification of the WWS with a humic reagent with the preparation of biologically active microorganisms, taken in an amount of from 0.05 to 1.00 l per ton of dry matter of the TSB.

Examples of specific implementation of the method

Example 1

Option 1 - according to the claimed method.

Detoxification of sewage sludge from municipal sewage treatment plants of Municipal Unitary Enterprise “Ufavodokanal”, obtained by dehydration on silt maps to a moisture content of 70%, was carried out by sequential treatment of biologically active microorganisms (reagent 2) with a humic reagent (reagent 1) and a preparation (consortium).

Option 2 - for comparison with the claimed method.

Detoxification of sewage sludge from municipal sewage treatment plants of Municipal Unitary Enterprise “Ufavodokanal”, obtained by dehydration on silt maps to a moisture content of 70%, was carried out by treating biologically active microorganisms with a preparation (consortium) (reagent 2).

As a humic reagent, the EcoOrganica preparation (reagent 1) was used, manufactured in accordance with TU 0392-001-99118391-2006 (table 1). EkoOrganika liquid fertilizer is a complex organic-mineral fertilizer. The main active ingredient of the drug is physiologically active potassium salts of humic acids (potassium humates). Also, the composition of the drug includes amino acids, carbohydrates, water-soluble carboxylic acids (oxalic, succinic, malic, citric), mineral nutrition elements (nitrogen, phosphorus, potassium) and trace elements (iron, copper, zinc, manganese, boron, molybdenum, etc.) .

Table 1 Characteristics of the humic reagent "EcoOrganics" The determined indicator unit of measurement Norm according to TU 0392-001-99118391-2006 Appearance Dark brown liquid Moisture content % 86-98 Organic matter content % 8-12 The content of potassium salts of humic acids % 4-5 Mass fraction of potassium salts of humic acids per dry matter, not less than % 70 pH KCI suspension 7.5-10 Mass fraction of nitrogen mg / 100 g not less than 100.0 Mass fraction of phosphorus mg / 100 g not less than 100.0 Mass fraction of potassium mg / l not less than 100.0 Mass fraction of arsenic mg / l no more than 2.0 Mass fraction of cadmium mg / l no more than 0.5 Mass fraction of mercury mg / l no more than 2.1 Mass fraction of lead mg / l no more than 32 Effective specific activity of radionuclides Bq / L no more than 300 The specific activity of technogenic radionuclides rel. units 1 rel units Mass concentration of 3.4 benz (a) pyrene mg / kg no more than 0,02

As a preparation (consortium) of biologically active microorganisms, a means for biodegradation and neutralization of manure and litter (“fermentation accelerator” UV-1, manufactured in accordance with TU 9291-008-00492374-2007), consisting of a suspension of living cultures that actually live in soil - Actinomyces fradiae of Candida krusei yeast in physiological saline (reagent 2). Living cultures - Actinomyces fradiae and Candida krusei - suppress the propagation of opportunistic bacteria and molds. 1 cm of the drug contains at least 2 · 10 ⁸ CFU (colony forming units) of living microorganisms. In the process of biochemical reactions accompanying the vital activity of microorganisms, the protein, hydrocarbon and plant parts of the WWS decompose, fermentation processes increase, the temperature of the fermenting mass increases, resulting in the destruction of helminths and protozoa, as well as stabilization of sewage sludge.

Preparation of working solutions

The working solution of reagent 1 is prepared at the rate of 2 kg of the drug per 30 liters of non-chlorinated water (taking into account the need to prevent overmoistening of WWS).

A working solution of reagent 2 is prepared at the rate of 0.05 liters of the drug per 50 liters of non-chlorinated water (taking into account the need to prevent overmoistening of WWS).

WWS processing according to option 1

Processing WWS reagent 1 is carried out by mixing in the tank of a concrete mixer (ABS). Sewage sludge is supplied to the ABS tank from the sludge card by a bucket feeder moving along the bottom of the sludge card on a special chassis. When filling the ABS to the desired volume, the feeder is stopped.

30 liters of the working solution of reagent 1 per 1 ton of WWS are loaded into the ABS tank, which corresponds to 0.7 wt.% Reagent 1 per dry substance of the WWS, and mixing is carried out along the route to the technological site until a homogeneous mass is formed.

The technological site has a waterproofing base and is equipped around the perimeter with a drainage ditch for collecting drains. Clamps formed 1 meter high are processed by sprinkling with a working solution of reagent 2. The consumption of a working solution of reagent 2 is 15 l / m ² , which corresponds to 0.05 liters of reagent 2 per 1 ton of dry WWS. Then the collars with double repetition using a grader are turned over. The shoulder prepared in this way is covered with a plastic film with the ends embedded in the embankment elements.

The process is monitored by measuring the temperature inside the collar with a frequency of 1 time per day. In this case, the temperature difference inside the collar during the course of the biochemical detoxification process and the ambient temperature should be at least 5 ° C and can reach 50 ° C.

The control of the number of microorganisms is carried out after 3 days after the formation of the shoulder and then every ten days until the end of the process.

The planned duration of the process is from 15 to 90 days (depending, for example, on the ambient temperature at different times of the year).

WWS processing according to option 2

Wastewater sludge is transported from the sludge map to the technological site by a dump truck on the Kamaz chassis, loading of WWS is carried out by an excavator. Clamps formed 1 meter high are processed by sprinkling with a working solution of reagent 2. The consumption of a working solution of reagent 2 is 15 l / m ² , which corresponds to 0.05 liters of reagent 2 per 1 ton of dry WWS. Then the collars with a height of 1 m with a double repetition using a grader are turned over. The shoulder prepared in this way is covered with a plastic film with the ends embedded in the embankment elements.

Tables 2, 3 respectively show the chemical, bacteriological and parasitological characteristics of the sewage sludge of MUF “Ufavodokanal”, recommended for producing organic fertilizer by the claimed method, before and after treatment: according to option 1 (sequential treatment with EcoOrganics and an accelerator of fermentation UV 1) and according to option 2 (UV-1 fermentation accelerator treatment).

It has been reliably established and substantially that after processing the WWS carried out according to option 1, i.e. by the proposed method, there was a reduction in the risk of waste - sewage sludge - for the environment in terms of the content of heavy metals, oil products and benz (a) pyrene (Table 2, column 6), as well as its disinfection in terms of the presence of pathogenic microflora, helminth eggs ( table 3, column 5).

Reducing the danger of the final product of the disposal of WWS by the proposed method is achieved due to changes in a whole range of characteristics of the initial waste, including due to:

- stabilization of the organogenic component, as evidenced by indicators of COD _bih and BOD ₅ and their ratio of COD _bih / BOD ₅ (Table 2, lines 2, 3);

- reducing the content of the mobile form of cadmium and zinc (table 2, lines 23, 24);

- accelerated destruction of petroleum products and decomposition of benzo (a) pyrene (Table 2, lines 30, 31).

As you can see, neither the treatment of WWS with one humic reagent (i.e., according to the prototype - Table 2, column 5), nor the treatment with WWS with the preparation of biologically active microorganisms (Table 2, column 7) give the results of the sequential treatment of WWS with the humic reagent described above and a preparation of biologically active microorganisms (Table 2, column 6), that is, indeed, the properties of a consortium of biologically active microorganisms were revealed not only to disinfect sewage sludge from pathogenic microflora and helminth eggs, but also to participate in processes with tabulation of the organogenic component of WWS (for example, Table 2, lines 2, 3); disposal of WWS from inorganic toxicants - salts of heavy metals (for example, Table 2, lines 23, 24) and organic toxicants - hydrocarbons of oil, oil products, benzo (a) pyrene (for example, Table 2, lines 30, 31).

table 2 Chemical characteristics of WWS before neutralization and after neutralization according to option 1 and option 2 No. p / p Name of indicator / component Units rev. Content before disposal after neutralization Option 1 Option 2 Reagent 1 - EcoOrganics Reagent 2-UV-1 Reagent 2-UV-1 one 2 3 four 5 6 7 one Humidity % 70.0 53.1 52.8 52.1 2 COD _Bih. mg / dm ³ 1240.0 1,100.0 389.0 1,080.0 3 BOD ₅ mg / dm ³ 410.0 302.0 179.0 282.0 four pH water units pH 6.7 6.9 7.5 7.0 5 Calcium oxide % 9.44 9.87 9.16 9.87 6 Magnesium oxide % 0.34 0.34 0.34 0.33 7 Silica % 10.76 10.55 10.47 10.50 8 Aluminium oxide % 1.76 1.77 1.77 1.80 9 Titanium oxide % 0.36 0.36 0.38 0.36 10 Barium oxide % 0.13 0.12 0.12 0.11 eleven Organic matter % 44,2 48,2 49.0 45.5 12 Nitrate nitrogen mg / kg 5956.0 2650.0 1382.0 2428.0 13 Phosphorus (in terms of P ₂ O ₅ ) mg / kg 15315.0 13,160.0 12071.0 13653.0 fourteen Potassium oxide % 0.65 0.63 0.61 0.65 fifteen Chloride ion % 0.003 0.003 0.003 0.003 16 Sulfate ion mg / kg 3174.0 2920.0 2222.0 2806,0 17 Sodium mg / kg 126.0 123.0 115.0 120.0 eighteen Vanadium mg / kg 17.5 16,0 13.0 14.0 19 Mercury mg / kg 0.14 0.13 0.12 0.12 twenty Arsenic mg / kg 0.78 0.44 0.30 0.44 21 Iron (mobile form) mg / kg 22.0 9.0 9.5 8.0 22 Manganese (mobile form) mg / kg 40,0 31,0 14.0 25.0 23 Cadmium (mobile form) mg / kg 4,5 2.0 <0.05 2.1 24 Zinc (mobile form) mg / kg 157.0 109.0 8.3 109.0 25 Lead (mobile form) mg / kg <0.1 <0.1 <0.1 <0.1 26 Copper (mobile form) mg / kg 6.4 6.0 4.0 6.0 27 Nickel (mobile form) mg / kg 5,0 4.0 2.0 4.0 28 Chrome (mobile form) mg / kg 1,0 0.9 0.7 0.9 29th Cobalt (mobile form) mg / kg <0.1 <0.1 <0.1 <0.1 thirty Oil products mg / kg 2200.0 500,0 <0.05 300,0 31 Benz (a) pyrene mg / kg 0,052 0.019 0.007 0.017

Table 3 Bacteriological and parasitological characteristics of the WWS according to example 1 The name of indicators Units rev. WWS before processing WWS after treatment with Humates "EcoOrganics" WWS after sequential treatment with Humates "EcoOrganics" and UV-1 one 2 3 four 5 Total number of microorganisms CFU / g 4 · 10 ⁵ 3 · 10 ³ 2 · 10 ⁷ The presence of Escherichia coli bacteria CFU / g 800 500 Not detected The presence of pathogenic microorganisms, including salmonel CFU / g Not detected Not detected Not detected The presence of helminth eggs and cysts of intestinal pathogenic protozoa ind./kg 10-20 2-5 Not detected

Example 2

Option 3 - according to the claimed method.

Detoxification of sewage sludge from the municipal sewage treatment plant of Municipal Unitary Enterprise “Ufavodokanal”, obtained by dehydration on silt maps to a moisture content of 70%, was carried out by sequential treatment of biologically active microorganisms (reagent 4) with a humic reagent (reagent 3) and a preparation (consortium).

Option 4 - for comparison with the claimed method.

Detoxification of sewage sludge from municipal sewage treatment plants of Municipal Unitary Enterprise “Ufavodokanal”, obtained by dehydration on silt maps to a moisture content of 70%, was carried out by treating biologically active microorganisms with a preparation (consortium) (reagent 4).

As humic reagent 3 used Humate-80 grade A, manufactured in accordance with TU 2189-001-71788256-2005. The main active ingredient of the drug is a mixture of physiologically active potassium and sodium salts of humic acids (table 4).

Table 4 Characteristics of Humate-80 grade A Name of indicator Characteristics 1. Appearance, color Powder, granules, tablets, black 2. Mass fraction of active substance (mixture of potassium and sodium salts of humic acids),%, on dry matter, not less than 78 3. Mass fraction of potassium, sodium% in terms of dry matter, not less four 4. Mass fraction of insoluble residue,%, no more 20.5 5. Acidity: an indicator of the activity of hydrogen ions (pH) of a 0.01% aqueous solution, not more than 10,2 6. Mass fraction of water,%, no more twenty 7. Mass concentration of impurities of toxic elements, mg / kg, not more than Lead 32 Cadmium 1,0 Arsenic 2.0 Mercury 2.1 8. Mass concentration of benzo (a) pyrene, mg / kg, less 0.02 9. The specific activity of technogenic radionuclides, rel. units, no more 1,0

The drug (consortium) of biologically active microorganisms used the drug "Tamir" - an aqueous solution containing a complex of beneficial natural microorganisms, which includes lactic acid, photosynthetic, nitrogen-fixing bacteria, yeast and saprophytic microorganisms that contribute to the accelerated decomposition of organics. The preparation is made in accordance with TU 9291-00152420326-2003, it is used for accelerated processing of animal waste into safe fertilizers. 1 cm ^{3 of the} preparation contains at least 2 · 10 ⁸ CFU (colony forming units) of living microorganisms.

In the process of biochemical reactions accompanying the vital activity of microorganisms, the organic part of the WWS decomposes, pathogenic microflora is suppressed, helminths and protozoa are destroyed, and sewage sludge is stabilized.

Preparation of working solutions

A working solution of reagent 3 is prepared at the rate of 1.5 kg of Humate-80 per 10 liters of non-chlorinated water in a 30-liter tank with a mixing device (preventing overmoistening of WWS). After vigorous stirring for 10 minutes, the working solution is settled and filtered through a filter.

The working solution of reagent 4 is prepared at the rate of 1 liter of the Tamir preparation per 50 liters of non-chlorinated water (prevention of overmoistening of WWS).

WWS processing according to option 3

Processing WWS reagent 3 is carried out by mixing in the tank of a concrete mixer (ABS). Sewage sludge is supplied to the ABS tank from the sludge card by a bucket feeder moving along the bottom of the sludge card on a special chassis.

When filling the ABS to the desired volume, the feeder is stopped.

30 liters of the working solution of the reagent 3 per 1 ton of WWS are loaded into the ABS tank, which corresponds to 1.5 wt% on the dry matter of the WWS, and mixing is carried out along the route to the technological site until a homogeneous mass is formed.

The technological site has a waterproofing base and is equipped around the perimeter with a drainage ditch for collecting drains. The collars formed by a height of 1 meter are processed by sprinkling with a working solution of reagent 4. The consumption of the working solution of the preparation is 5 l / m ² , which corresponds to 0.3 liters of the Tamir preparation per 1 ton of dry WWS. Then the collars with double repetition using a grader are turned over. The shoulder prepared in this way is covered with a plastic film with the ends embedded in the embankment elements.

The process is monitored by measuring the temperature inside the collar with a frequency of 1 time per day. In this case, the temperature difference inside the collar during the course of the biochemical detoxification process and the ambient temperature should be at least 5 ° C and can reach 50 ° C.

The control of the number of microorganisms is carried out after 3 days after the formation of the shoulder and then every ten days until the end of the process.

The planned duration of the process is from 15 to 90 days.

WWS processing according to option 4

Wastewater sludge is transported from the sludge map to the technological site by a dump truck on the KamAZ chassis, loading of WWS is carried out by an excavator. The collars formed by a height of 1 meter are processed by sprinkling with a working solution of reagent 4. The consumption of the working solution of the preparation is 5 l / m ² , which corresponds to 0.3 liters of the Tamir preparation per 1 ton of dry WWS. Then the collars with double repetition using a grader are turned over. The shoulder prepared in this way is covered with a plastic film with the ends embedded in the embankment elements.

Tables 5, 6 respectively show the chemical, bacteriological and parasitological characteristics of the sewage sludge of MUF “Ufavodokanal” before and after treatment: according to option 3 (after sequential treatment with reagent 3 with “Humat-80” and reagent 4 with “Tamir” ) and option 4 (after treatment with reagent 4 - the drug "Tamir").

It is significant that after WWS treatment carried out according to option 3, there was a decrease in the risk of waste - sewage sludge - for the environment (table 5, column 6), its disinfection in terms of the presence of pathogenic microflora, helminth eggs (table 6, column 5) . The risk reduction of the final product of WWS neutralization by the proposed method was achieved due to a change in a whole range of characteristics of the initial waste, including due to stabilization of the organogenic component, as evidenced by the indicators of COD _bih and BOD ₅ and their ratio of COD _bih / BOD ₅ (table 5, line 2 , 3), reducing the content of the mobile form of cadmium and zinc (Table 5, lines 23, 24), accelerated destruction of petroleum products and decomposition of benzo (a) pyrene (Table 5, lines 30, 31).

Table 5 Chemical characteristics of WWS before neutralization and after neutralization according to option 3 and option 4 No. p / p Name of indicator / component Units rev. Content Before disposal After neutralization Option 3 Option 4 Reagent 3 - Humate-80 Reagent 4 - "Tamir" Reagent 4 - "Tamir" one 2 3 four 5 6 7 one Humidity % 70.0 48.3 49.7 50.6 2 COD _Bih mg / dm ³ 1240.0 1030.0 490.0 950.0 3 BOD ₅ mg / dm ³ 410.0 302.0 179.0 282.0 four pH water units pH 6.7 7.0 6.8 7.2 5 Calcium oxide % 9.44 9.52 9.55 9.61 6 Magnesium oxide % 0.34 0.33 0.33 0.33 7 Silica % 10.76 10.75 10.74 10.68 8 Aluminium oxide % 1.76 1.76 1.76 1.76 9 Titanium oxide % 0.36 0.36 0.36 0.36 10 Barium oxide % 0.13 0.13 0.13 0.11 eleven Organic matter % 44,2 46.1 46.2 45.9 12 Nitrate nitrogen mg / kg 5956.0 3350.0 3420.0 3450.0 13 Phosphorus (in terms of P ₂ O ₅ ) mg / kg 15315.0 12,890.0 13,160.0 13,250.0 fourteen Potassium oxide % 0.65 0.64 0.63 0.63 fifteen Chloride ion % 0.003 0.003 0.003 0.003 16 Sulfate ion mg / kg 3174.0 3030,0 2980.0 2920.0 17 Sodium mg / kg 126.0 120.0 120.0 121.0 eighteen Vanadium mg / kg 17.5 17.0 16,0 16,0 19 Mercury mg / kg 0.14 0.12 0.12 0.12 twenty Arsenic mg / kg 0.78 0.52 0.55 0.50 21 Iron (mobile form) mg / kg 22.0 8.1 8.2 8.2 22 Manganese (mobile form) mg / kg 40,0 29.0 22.0 23.0 23 Cadmium (mobile form) mg / kg 4,5 1.7 0.05 1.9 24 Zinc (mobile form) mg / kg 157.0 105.0 11.6 99.0 25 Lead (mobile form) mg / kg <0.1 <0.1 <0.1 <0.1 26 Copper (mobile form) mg / kg 6.4 6.2 5.9 5.9 27 Nickel (mobile form) mg / kg 5,0 4,5 2.2 3.8 28 Chrome (mobile form) mg / kg 1,0 1,0 0.8 0.8 29th Cobalt (mobile form) mg / kg <0.1 <0.1 <0.1 <0.1 thirty Oil products mg / kg 2200.0 450,0 <0.05 250,0 31 Benz (a) pyrene mg / kg 0,052 0,027 0.012 0,022

Table 6 Bacteriological and parasitological characteristics of the WWS according to example 2 The name of indicators Units rev. WWS before processing WWS after treatment with humates Gumat-80 WWS after treatment with humates Gumat-80 and Tamir one 2 3 four 5 Total number of microorganisms CFU / g 4 · 10 ⁵ 3 · 10 ⁵ 2 · 10 ⁷ The presence of Escherichia coli bacteria CFU / g 800 500 Not detected The presence of pathogenic microorganisms, including salmonel CFU / g Not detected Not detected Not detected The presence of helminth eggs and cysts
intestinal ind./kg 10-20 2-5 Not detected pathogenic protozoa

As you can see, neither the treatment of WWS with one humic reagent (i.e., according to the prototype - Table 5, column 5), nor the treatment with WWS with the preparation of biologically active microorganisms (Table 5, column 7) give the results of the sequential treatment of WWS with the humic reagent described above and a preparation of biologically active microorganisms (Table 5, column 6), that is, indeed, the properties of a consortium of biologically active microorganisms were revealed not only to disinfect sewage sludge from pathogenic microflora and helminth eggs, but also to participate in processes with tabulation of the organogenic component of WWS (for example, Table 5, lines 2, 3); disposal of WWS from inorganic toxicants - salts of heavy metals (for example, Table 5, lines 23, 24) and organic toxicants - hydrocarbons of oil, oil products, benz (a) pyrene (for example, Table 5, lines 30, 31).

From tables 2, 3, 5, 6 it follows that in the case of the proposed integrated treatment, the best results are obtained detoxification of sewage sludge and its disposal. Therefore, the product of such complex processing is recommended by the applicant for use as an organomineral fertilizer.

In contrast to the prototype, where the use of the WWS neutralization product as a fertilizer is allowed only once every four to five years, the frequency and rate of application of the product — organomineral fertilizer obtained by the proposed method are regulated only by the state of the soil cover of the application fields, which suggests the possibility of annual application this fertilizer. Obtained by the claimed method, the fertilizer product meets the requirements of environmental protection, including its sanitary-bacteriological and parasitological indicators (GOST R 17.4.3.07-2001), it is stabilized (inert) in terms of biochemical oxygen consumption and chemical oxygen consumption and therefore not decays and does not emit an unpleasant smell.

Claims (1)

A method of producing organic fertilizer by detoxification of sewage sludge with a humic reagent, taken in an amount of from 0.3 to 10.0 wt.% Per dry matter of sewage sludge, characterized in that the detoxification product of sewage sludge with a humic reagent is additionally treated with a biologically active microorganism preparation taken in an amount of from 0.05 to 1.00 liters per ton of dry matter of sewage sludge.