CN111675583A - Method for harmlessly treating sludge and application - Google Patents
Method for harmlessly treating sludge and application Download PDFInfo
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- CN111675583A CN111675583A CN202010612572.0A CN202010612572A CN111675583A CN 111675583 A CN111675583 A CN 111675583A CN 202010612572 A CN202010612572 A CN 202010612572A CN 111675583 A CN111675583 A CN 111675583A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/20—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation using specific microorganisms or substances, e.g. enzymes, for activating or stimulating the treatment
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention discloses a method for harmlessly treating sludge and application thereof. The method comprises the following steps: 1) collecting activated sludge, and removing solid impurities through a grid to leave liquid sludge; 2) preliminarily dehydrating the liquid sludge to obtain dehydrated sludge; 3) transferring the dewatered sludge into a fermentation tank for fermentation; 4) transferring the fermented sludge into a stirring device, mixing with rice straws, grass seeds and viscous microorganisms, and continuously stirring for 1-1.2 h; 5) the stirred sludge is conveyed into a shaping device by a conveyor belt, and the sludge is cut and extruded into brick shapes by the shaping device; 6) and (3) soaking the brick-shaped sludge in the fixing glue, immediately taking out after three seconds to finish surface glue plating, and then air-drying overnight at room temperature to obtain the brick-shaped sludge. The sludge treated by the method can be reasonably applied to a suitable place, so that the influence caused by sludge accumulation is reduced.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for harmlessly treating sludge and application thereof.
Background
In the process of continuous city development, the urban sewage yield is continuously increased, the sewage disposal quantity of various cities in China is explosively increased at present, and the active sludge method is the main method adopted by large-scale sewage treatment plants in China at present. Therefore, excess sludge is inevitably generated in the sewage treatment process, and with the continuous development of the sewage treatment industry and the continuous improvement of the environmental protection requirement, the excess sludge generated by the sewage treatment plant is another important problem and challenge faced by the sewage treatment industry at present.
Disclosure of Invention
The invention aims to provide a method for harmlessly treating sludge, which aims to solve the problem that a large amount of activated sludge cannot be treated at present, and reasonably apply the sludge to a proper place after the sludge reaches a harmless degree, so that the influence caused by sludge accumulation is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for harmlessly treating sludge comprises the following steps:
1) collecting a large amount of liquid or activated sludge with high water content, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 15 to 20 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing with rice straws, grass seeds and viscous microorganisms, and continuously stirring for 1-1.2 h;
5) the stirred sludge is conveyed into a shaping device by a conveyor belt, and the sludge is cut and extruded into brick shapes by the shaping device;
6) and (3) soaking the brick-shaped sludge in the fixing glue, immediately taking out after three seconds to finish surface glue plating, and then air-drying overnight at room temperature to obtain the brick-shaped sludge.
In the step 2), a solid-liquid separator or a filter press is used for preliminarily dehydrating the liquid sludge.
In the step 4), 100-120 kg of straws, 1-2kg of grass seeds and 10-13.5L of viscous microorganisms are mixed into each ton of sludge.
The viscous microorganism is a mixture of bacillus polymyxa and myceliophthora viscosus.
The volume ratio of the bacillus polymyxa to the filamentous spore yeast is 2-3: 1.
Before mixing, the bacillus polymyxa is cultured by using an LB culture medium; the viscous hyphomycete is cultured by a beef extract peptone culture medium before mixing, and the pH value is adjusted to 6-7.5 after the bacillus polymyxa and the viscous hyphomycete are mixed.
In the step 6), the glue used in the glue plating procedure is polysaccharide secreted by microorganisms.
Further, the polysaccharide secreted by the microorganisms is prepared from gellan gum, xanthan gum and welan gum according to a volume ratio of 4: 2-3: 1.
The sludge treated by the method can be reasonably applied to a suitable place, so that the influence caused by sludge accumulation is reduced. For example, the solid activated sludge obtained by stirring in step 4) is bagged and spread on the surface of a field where crop seeds are planted, to be used as a fertilizer. The block-shaped sludge obtained in the step 7) is conveyed to a zone with serious desertification and spliced on the surface of the sand, and the grassland can still grow out under severe environment by utilizing the water storage property of the activated sludge and the grass seeds contained in the activated sludge, so that the desertification environment is improved.
In the treatment process, the fermentation procedure is to degrade macromolecular substances which cannot be utilized by plants into available small molecular inorganic substances, and simultaneously, the fermentation can kill part of harmful microorganisms.
The purpose of the straw is to provide a fibrous skeleton for the subsequently prepared bulk activated sludge.
The purpose of mixing the viscous microorganisms is to fix the interior of the massive activated sludge, strengthen the physical strength of the massive activated sludge, prevent the massive activated sludge from being internally split due to external influence and improve the water storage capacity of the soil.
The purpose of plating the glue is to form a film outside the massive activated sludge, avoid the influence of the external environment on the internal structure and simultaneously slow down the evaporation of a large amount of water inside the activated sludge.
By adopting the technical scheme, the invention not only can effectively remove the harm caused by the sludge and reduce the influence caused by sludge accumulation, but also can realize reasonable sludge application. The fermented activated sludge contains a large amount of nutrient substances including nitrogen and phosphorus, has good water storage property, can be fully absorbed by crops when being covered on the soil surface, accelerates the growth of the crops, and is a high-efficiency solid fertilizer. Because the interior water content of the massive activated sludge is rich, and the exterior of the massive activated sludge is wrapped by microbial polysaccharide, the massive activated sludge is not easy to be scattered by being exposed to the sun and wind like common soil, and can be tightly adhered to the surface of the soil. Meanwhile, after the activated sludge is fermented, a large amount of water and nutrient substances are contained inside, so that the growth of the internal grass seeds can be further accelerated even in a desert environment, the external environment can be improved more efficiently, the problem of land desertification is solved, and the severe environment is improved.
Detailed Description
Example 1
A method for harmlessly treating sludge comprises the following steps:
1) collecting a large amount of liquid or activated sludge with high water content, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge by using a solid-liquid separator to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 15 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing 100kg of straws, 2kg of grass seeds and 10L of viscous microorganisms into each ton of sludge, and continuously stirring for 1 hour;
the viscous microorganism is formed by mixing bacillus polymyxa and myceliophthora viscosus according to the volume ratio of 2: 1; wherein, before mixing, the bacillus polymyxa is cultured by using an LB culture medium, before mixing, the myceliophthora viscosus is cultured by using a beef extract peptone culture medium, and after mixing, the bacillus polymyxa and the myceliophthora viscosus are adjusted to have a pH value of 6;
5) and bagging the stirred solid activated sludge, and spreading the bagged solid activated sludge on the surface of a field which is inoculated with crop seeds to obtain the solid fertilizer.
Example 2
A method for harmlessly treating sludge comprises the following steps:
1) collecting a large amount of liquid or activated sludge with high water content, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge by using a filter press to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 20 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing 120kg of straws, 1kg of grass seeds and 13.5L of viscous microorganisms into each ton of sludge, and continuously stirring for 1.2 h;
the viscous microorganism is formed by mixing bacillus polymyxa and myceliophthora viscosus according to the volume ratio of 3: 1; wherein, before mixing, the bacillus polymyxa is cultured by using an LB culture medium, before mixing, the myceliophthora viscosus is cultured by using a beef extract peptone culture medium, and after mixing, the bacillus polymyxa and the myceliophthora viscosus are adjusted to pH value of 7.5;
5) and bagging the stirred solid activated sludge, and spreading the bagged solid activated sludge on the surface of a field which is inoculated with crop seeds to obtain the solid fertilizer.
Example 3
A method for harmlessly treating sludge comprises the following steps:
1) collecting a large amount of liquid or activated sludge with high water content, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge by using a solid-liquid separator to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 18 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing 110kg of straws, 1.5kg of grass seeds and 12L of viscous microorganisms into each ton of sludge, and continuously stirring for 1 hour;
the viscous microorganism is formed by mixing bacillus polymyxa and myceliophthora viscosus according to the volume ratio of 2.53: 1; wherein, before mixing, the bacillus polymyxa is cultured by using an LB culture medium, before mixing, the myceliophthora viscosus is cultured by using a beef extract peptone culture medium, and after mixing, the bacillus polymyxa and the myceliophthora viscosus are adjusted to pH value of 7.0;
5) and bagging the stirred solid activated sludge, and spreading the bagged solid activated sludge on the surface of a field which is inoculated with crop seeds to obtain the solid fertilizer.
Example 4
A method for harmlessly treating sludge comprises the following steps:
1) collecting a large amount of liquid or activated sludge with high water content, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge by using a solid-liquid separator to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 15 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing 100kg of straws, 2kg of grass seeds and 10L of viscous microorganisms into each ton of sludge, and continuously stirring for 1-1.2 h;
the viscous microorganism is formed by mixing bacillus polymyxa and myceliophthora viscosus according to the volume ratio of 2.5: 1; wherein, before mixing, the bacillus polymyxa is cultured by using an LB culture medium, before mixing, the myceliophthora viscosus is cultured by using a beef extract peptone culture medium, and after mixing, the bacillus polymyxa and the myceliophthora viscosus are adjusted to have a pH value of 7.0.5;
5) the stirred sludge is conveyed into a shaping device by a conveyor belt, and the sludge is cut and extruded into brick shapes by the shaping device;
6) soaking brick-shaped sludge in fixing glue, taking out the brick-shaped sludge immediately after three seconds to finish surface glue plating, and then air-drying the brick-shaped sludge overnight at room temperature to obtain the brick-shaped sludge;
the fixing glue is prepared from gellan gum, xanthan gum and welan gum according to the volume ratio of 4:2.5: 1;
7) the massive sludge is conveyed to a zone with serious desertification, the surface of the sand is spliced, and the grassland can still grow out under severe environment by utilizing the water storage property of the activated sludge and the grass seeds contained in the activated sludge, so that the desertification environment is improved.
Example 5
A method for harmlessly treating sludge comprises the following steps:
1) collecting a large amount of liquid or activated sludge with high water content, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge by using a filter press to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 20 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing 120kg of straws, 1.5kg of grass seeds and 13.5L of viscous microorganisms into each ton of sludge, and continuously stirring for 1 hour;
the viscous microorganism is formed by mixing bacillus polymyxa and myceliophthora viscosus according to the volume ratio of 2: 1; wherein, before mixing, the bacillus polymyxa is cultured by using an LB culture medium, before mixing, the myceliophthora viscosus is cultured by using a beef extract peptone culture medium, and after mixing, the bacillus polymyxa and the myceliophthora viscosus are adjusted to have a pH value of 6;
5) the stirred sludge is conveyed into a shaping device by a conveyor belt, and the sludge is cut and extruded into brick shapes by the shaping device;
6) soaking brick-shaped sludge in fixing glue, taking out the brick-shaped sludge immediately after three seconds to finish surface glue plating, and then air-drying the brick-shaped sludge overnight at room temperature to obtain the brick-shaped sludge;
the fixing glue is prepared from gellan gum, xanthan gum and welan gum according to the volume ratio of 4:2: 1;
7) the massive sludge is conveyed to a zone with serious desertification, the surface of the sand is spliced, and the grassland can still grow out under severe environment by utilizing the water storage property of the activated sludge and the grass seeds contained in the activated sludge, so that the desertification environment is improved.
Example 6
A method for harmlessly treating sludge comprises the following steps:
1) collecting a large amount of liquid or activated sludge with high water content, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge by using a solid-liquid separator or a filter press to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 18 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing 115kg of straws, 1.8kg of grass seeds and 12.5L of viscous microorganisms into each ton of sludge, and continuously stirring for 1.1 h;
the viscous microorganism is formed by mixing bacillus polymyxa and myceliophthora viscosus according to the volume ratio of 3: 1; wherein, before mixing, the bacillus polymyxa is cultured by using an LB culture medium, before mixing, the myceliophthora viscosus is cultured by using a beef extract peptone culture medium, and after mixing, the bacillus polymyxa and the myceliophthora viscosus are adjusted to pH value of 7.5;
5) the stirred sludge is conveyed into a shaping device by a conveyor belt, and the sludge is cut and extruded into brick shapes by the shaping device;
6) soaking brick-shaped sludge in fixing glue, taking out the brick-shaped sludge immediately after three seconds to finish surface glue plating, and then air-drying the brick-shaped sludge overnight at room temperature to obtain the brick-shaped sludge;
the fixing glue is prepared from gellan gum, xanthan gum and welan gum according to the volume ratio of 4:3: 1;
7) the massive sludge is conveyed to a zone with serious desertification, the surface of the sand is spliced, and the grassland can still grow out under severe environment by utilizing the water storage property of the activated sludge and the grass seeds contained in the activated sludge, so that the desertification environment is improved.
Claims (10)
1. A method for harmlessly treating sludge is characterized by comprising the following steps: which comprises the following steps:
1) collecting activated sludge, and removing redundant solid impurities through a grid to leave viscous liquid sludge;
2) preliminarily dehydrating the liquid sludge to reduce the water content in the activated sludge to below 50 percent to obtain dehydrated sludge;
3) transferring the dewatered sludge into a fermentation tank, fermenting for 15 to 20 days, opening the fermentation tank when the temperature is cooled to 20 ℃, and taking out the sludge;
4) transferring the fermented sludge into a stirring device, mixing with rice straws, grass seeds and viscous microorganisms, and continuously stirring for 1-1.2 h;
5) the stirred sludge is conveyed into a shaping device by a conveyor belt, and the sludge is cut and extruded into brick shapes by the shaping device;
6) and (3) soaking the brick-shaped sludge in the fixing glue, immediately taking out after three seconds to finish surface glue plating, and then air-drying overnight at room temperature to obtain the brick-shaped sludge.
2. The method for harmlessly treating sludge according to claim 1, wherein: in the step 2), a solid-liquid separator or a filter press is used for preliminarily dehydrating the liquid sludge.
3. The method for harmlessly treating sludge according to claim 1, wherein: in the step 4), 100-120 kg of straws, 1-2kg of grass seeds and 10-13.5L of viscous microorganisms are mixed into each ton of sludge.
4. The method for harmlessly treating sludge according to claim 1, wherein: the viscous microorganism is a mixture of bacillus polymyxa and myceliophthora viscosus.
5. The method for harmlessly treating sludge according to claim 4, wherein: the volume ratio of the bacillus polymyxa to the filamentous spore yeast is 2-3: 1.
6. The method for harmlessly treating sludge according to claim 4, wherein: before mixing, the bacillus polymyxa is cultured by using an LB culture medium; the viscous hyphomycete is cultured by a beef extract peptone culture medium before mixing, and the pH value is adjusted to 6-7.5 after the bacillus polymyxa and the viscous hyphomycete are mixed.
7. The method for harmlessly treating sludge according to claim 1, wherein: in the step 6), the glue used in the glue plating procedure is polysaccharide secreted by microorganisms.
8. The method for innocent treatment of sludge according to claim 7, wherein: the polysaccharide secreted by the microorganisms is prepared from gellan gum, xanthan gum and welan gum according to a volume ratio of 4: 2-3: 1.
9. The method for harmlessly treating sludge according to claim 1, wherein: bagging the solid activated sludge obtained by stirring in the step 4), and spreading the bagged solid activated sludge on the surface of a field which is inoculated with crop seeds to serve as a fertilizer.
10. The method for harmlessly treating sludge according to claim 1, wherein: conveying the blocky sludge obtained in the step 7) to a zone with serious desertification, and splicing the blocky sludge on the surface of the sand to improve the desertification environment.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112876038A (en) * | 2021-01-22 | 2021-06-01 | 湖南江山春锦科技有限公司 | A retrieve system of recycling for river lake silt |
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Application publication date: 20200918 |
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