CN110818210A - Municipal sludge solidification ecological treatment process - Google Patents
Municipal sludge solidification ecological treatment process Download PDFInfo
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- CN110818210A CN110818210A CN201911093186.9A CN201911093186A CN110818210A CN 110818210 A CN110818210 A CN 110818210A CN 201911093186 A CN201911093186 A CN 201911093186A CN 110818210 A CN110818210 A CN 110818210A
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- 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
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- 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
- C02F11/008—Sludge treatment by fixation or solidification
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Abstract
The invention discloses a municipal sludge solidification ecological treatment process, which comprises the following steps: the method comprises the steps of preparation before construction, stirring pool arrangement, sludge dredging, foreign matter separation, sludge solidification treatment, natural maintenance, sampling detection, backfilling, greening (direct greening/earthing greening), wherein a sludge solidification medicament is an inorganic material, a hydrate needle crystal is generated through hydration and is combined with soil to form a stable particle group, so that the effect of changing the sludge property is achieved.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a municipal sludge solidification ecological treatment process.
Background
At present, the annual total yield of municipal sludge in China exceeds 4000 ten thousand tons, and the data is estimated to reach 6000 to 9000 ten thousand tons in 2020. With the increase of sewage treatment capacity and the stricter treatment standard in China, the sludge output of domestic sewage treatment plants can continue to increase. Ten items of water are specifically provided, and urban sludge treatment is further promoted, the existing sludge treatment facilities basically complete standard-reaching transformation before 2017, and the harmless treatment rate of the municipal sludge on the grade of land and above reaches more than 90% before 2020.
At present, a plurality of bottleneck restriction factors exist in sludge treatment. Firstly, sewage treatment plants are built and put into use in large, medium and small cities in China, but sludge treatment equipment is rarely correspondingly configured; secondly, at present, sewage treatment fees are paid for large, medium and small cities in China, but sludge treatment fees are paid for few cities; thirdly, since the sludge treatment starts late, the construction of the sludge treatment places is not brought into the urban planning of numerous cities, and many cities are difficult to find suitable sludge treatment methods and sludge disposal places, and sludge is usually dewatered to 60% and is transported to the outsides of the cities and stacked in public environments such as farmlands, rivers and the like, so that the environment-friendly effect of sewage treatment is offset, a large amount of land is occupied, and secondary pollution is generated. China has no mandatory requirements on sludge treatment in the legal level, the standard specification development of sludge treatment is lagged, and a mature commercial sludge treatment industrial mode is lacked.
On one hand, the sludge treatment contains a large amount of organic matters, nitrogen, phosphorus, potassium and other substances, and has the utilization surface; on the other hand, part of pollutants contained in the sewage is transferred into the sludge, so that the sludge has high water content, has strong odor and contains a large amount of pathogenic bacteria, heavy metal pollutants such as chromium, mercury and the like, and toxic harmful and carcinogenic substances which are difficult to degrade, if untreated, the pollutants can cause pollution to underground water and soil, the environmental safety and the public health are threatened, and the treatment of the sludge needs to recycle resources under the condition of ensuring that the sludge does not generate secondary pollution any more.
In view of the above situation, this patent aims at providing a sludge solidification technology, has fine inhibitory action to heavy metal hexavalent chromium precipitation, has handled the heavy metal in the mud and has precipitated the problem, and effectual groundwater quality of water has been protected, has avoided other soil to be worried about after by infectious contamination.
Disclosure of Invention
A municipal sludge solidification ecological treatment process comprises the following process steps:
(1) preparation before construction
After entering a field, firstly, cleaning and leveling, cleaning by adopting a mode of combining mechanical cleaning and manual cleaning according to the field condition, wherein the depth of the cleaning is 20-30cm, the impurities such as turf, tree roots and the like on the ground surface need to be removed, the impurities are transported to a waste soil field by a self-dumping truck loaded by an excavator, leveling the field after cleaning the base, and constructing a temporary road according to the construction requirement;
(2) is provided with a stirring tank
N stirring pools are arranged at proper places selected in a construction site, the stirring pools adopt a ground digging groove form, and isolation steel plates are laid on the walls and the bottom of the grooves;
(3) sludge dredging
Determining the conditions of pool boundaries, excavation positions, depths and the like according to the coordinates, and selecting proper excavation equipment by combining the designed treatment capacity and the properties of the sludge;
(4) foreign matter separation
Placing the sludge in a stirring tank, and screening to remove foreign matters such as stones and impurities;
(5) sludge solidification treatment
According to the earlier-stage sludge index detection data of the project and the indoor sludge solidification experiment data, the selection and the addition amount of a curing agent are determined, the dosage is determined, the mode of adding the curing agent into the stirring tank can adopt a manual dosing mode, and a quantitative feeding stirring device can also be adopted, so that the sludge in the stirring tank is fully stirred while the layered dosing is carried out, the sludge and the curing agent are uniformly mixed, and the operation efficiency is improved;
(6) natural curing
Placing the sludge after solidification at a designated position, and carrying out natural curing for 7-28 days;
(7) sampling detection
Sampling cured sludge in batches after maintenance is finished, testing indexes such as water content, pH value, strength, heavy metal precipitation and the like, and detecting whether the engineering reaches the standard or not so as to detect whether the engineering reaches the standard or not;
(8) backfilling
The solidified sludge can not be slimed, the precipitation of harmful substances (heavy metals) is inhibited, harmful bacteria, COD, BOD, phosphorus and the like in the sludge are removed, and safe backfilling can be carried out;
(9) greening
The pH value of the solidified sludge is 8-10, the sludge is alkalescent, and vegetation planting can be uniformly carried out (direct planting on the surface layer of the solidified sludge or planting after natural soil is covered on the surface layer of the solidified sludge); if the planted plants have special requirements on the PH value, the expected effect can be achieved by adjusting the addition ratio of the curing agent.
Preferably, the early-stage experiment in the step (5) comprises a cone penetration test, a cross shear force test, a loss on ignition test, heavy metal ion content detection, unconfined compressive strength detection, water content and wetting density detection, curing effect test and COD value determination.
Preferably, the quality control test is periodically performed on the solidified sludge during the step (7) to confirm the soil property, and if not otherwise specified, the test is performed on the 7 th day after the solidification treatment.
Preferably, the quality management test comprises a water ratio test, a wettability test, a fluidity test, a ph test, a cone penetration test, unconfined compressive strength detection and a heavy metal precipitation test.
Preferably, the frequency of the quality control test is 1 time/day of water ratio test, 2 times/day of wettability test, 2 times/day of fluidity test, 1 time/day of ph test and 1000m of treatment per cone penetration test3The sludge is subjected to primary unconfined compressive strength detection and is treated by 1000m each time3The sludge is subjected to one-time heavy metal precipitation experiment, and each treatment time is 2000m3Is carried out once.
Preferably, the detection tests required after completion of the step (7) comprise unconfined compressive strength detection (uniaxial compressive strength test), re-argillization test, soil pH value detection and heavy metal ion dissolution detection.
Has the advantages that: the invention provides a municipal sludge solidification ecological treatment process, which comprises the following steps: the method comprises the steps of preparation before construction, stirring pool arrangement, sludge dredging, foreign matter separation, sludge solidification treatment, natural maintenance, sampling detection, backfilling, greening (direct greening/soil covering and greening), wherein a sludge solidification medicament is an inorganic material, a hydrate needle crystal is generated through hydration and is combined with soil to form a stable particle group so as to achieve the effect of changing the sludge propertyThe water quality has the following worries of avoiding other soils from being infected and polluted, the early stage experiment in the step (5) comprises a cone penetration test, a cross shear force test, a loss on ignition test, a heavy metal ion content test, an unconfined compressive strength test, a water content and wetting density test, a solidification effect test and a COD value test, the experiment can effectively detect the condition of the sludge before solidification so as to calculate the accurate dosage, the quality management experiment to the solidified sludge is carried out regularly in the construction process of the step (7) to confirm the soil property, if no special description is given, the experiment is carried out on the 7 th day after solidification treatment, the quality management experiment comprises a water content ratio test, a wettability test, a fluidity test, a ph test, a cone penetration test, an unconfined compressive strength test and a heavy metal precipitation experiment, the frequency of the quality management test is 1 time/day of water ratio test, 2 times/day of wettability test, 2 times/day of fluidity test, 1 time/day of ph test and 1000m treatment per cone penetration test3The sludge is subjected to primary unconfined compressive strength detection and is treated by 1000m each time3The sludge is subjected to one-time heavy metal precipitation experiment, and each treatment time is 2000m3The method can be carried out once, the properties of the solidified sludge can be objectively and accurately reflected, the detection tests required after the step (7) is completed comprise unconfined compressive strength detection (uniaxial compressive strength test), re-argillization test, soil pH value detection and heavy metal ion dissolution detection, and the method can be used for detecting the solidified sludge after the completion so as to reflect the process effect of the method.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1:
a municipal sludge solidification ecological treatment process comprises the following process steps:
(1) preparation before construction
3 natural pools are solidified, 33058.30m is piled in a larger pile3Sludge, second stacking 9544.20m3The smallest stack is 2053.90m3After entering a field, firstly, cleaning and leveling, cleaning by adopting a mode of combining mechanical cleaning and manual cleaning according to the field condition, wherein the depth of the cleaning is 25cm, the impurities such as turf, tree roots and the like on the ground surface need to be removed, the impurities are transported to a spoil area by a self-dumping truck loaded by an excavator, and after the cleaning is finished, the field is leveled, and a temporary road is built according to the construction requirement;
(2) is provided with a stirring tank
2 stirring ponds are arranged at proper places selected at a construction site, the stirring ponds adopt a ground digging groove form, isolation steel plates are laid on the groove walls and the bottom of the groove, the size of the laid stirring pond is 10m multiplied by 20m, the depth is 3 m, and the sludge treatment amount per day is 1200m3；
(3) Sludge dredging
Determining the conditions of pool boundaries, excavation positions, depths and the like according to the coordinates, and selecting proper excavation equipment by combining the designed treatment capacity and the properties of the sludge;
(4) foreign matter separation
Placing the sludge in a stirring tank, and screening to remove foreign matters such as stones and impurities;
(5) sludge solidification treatment
According to the earlier stage sludge index detection data and the indoor sludge solidification experiment data results of the project, the selection and the addition of the curing agent are determined, the earlier stage experiment comprises a cone penetration test, a cross shear force test, a loss on ignition test, a heavy metal ion content test, an unconfined compressive strength test, a water content and wetting density test, a curing effect test, a COD value test and the addition amount (kg/m)3Added as a cubic sludge solidifying agent) of 75kg/m3The mode of adding the curing agent into the stirring tank can adopt a manual dosing mode, and can also adopt quantitative feeding stirring equipment to carry out full stirring while adding the curing agent layer by layer to the sludge in the stirring tank, thereby ensuring that the sludge and the curing agent are uniformly mixed and improving the operation efficiency;
(6) natural curing
Placing the sludge after solidification at a designated position, and carrying out natural curing for 20 days;
(7) sampling detection
Sampling cured sludge in batches after curing, carrying out index tests such as water content, pH value, strength, heavy metal precipitation and the like, detecting whether a project reaches the standard or not to detect whether the project reaches the standard or not, carrying out quality management tests on the cured sludge regularly during construction, confirming the soil property, and if not specifically stated, starting the test on the 7 th day after curing treatment, wherein the frequency of the quality management tests is 1 time/day of water content ratio test, 2 times/day of wettability test, 2 times/day of fluidity test, 1 time/day of PH test, and 1000m of treatment per cone penetration test3The sludge is subjected to primary unconfined compressive strength detection and is treated by 1000m each time3The sludge is subjected to one-time heavy metal precipitation experiment, and each treatment time is 2000m3The method is carried out once, and the required detection tests after completion comprise unconfined compressive strength detection (uniaxial compressive strength test), re-argillization test, soil pH value detection and heavy metal ion dissolution detection;
(8) backfilling
The solidified sludge can not be slimed, the precipitation of harmful substances (heavy metals) is inhibited, harmful bacteria, COD, BOD, phosphorus and the like in the sludge are removed, and safe backfilling can be carried out;
(9) greening
The pH value of the solidified sludge is 8, the solidified sludge is alkalescent, and vegetation planting can be uniformly carried out (direct planting on the surface layer of the solidified sludge or planting after natural soil is covered on the surface layer of the solidified sludge); if the planted plants have special requirements on the PH value, the expected effect can be achieved by adjusting the addition ratio of the curing agent.
Example 2:
a municipal sludge solidification ecological treatment process comprises the following process steps:
(1) preparation before construction
3 natural pools are solidified, 33058.30m is piled in a larger pile3Sludge, second stacking 9544.20m3The smallest stack is 2053.90m3After entering the field, firstly, cleaning and leveling the foundation, and cleaning the foundation in a mode of combining mechanical cleaning and manual cleaning according to the field condition, wherein the foundation is cleaned deeplyThe height is 25cm, the impurities on the surface of the ground such as turf and tree roots need to be removed, the impurities are transported to a spoil area by a self-dumping truck loaded by an excavator, the ground is leveled after the base cleaning is finished, and a temporary road is built according to the construction requirement;
(2) is provided with a stirring tank
2 stirring ponds are arranged at proper places selected at a construction site, the stirring ponds adopt a ground digging groove form, isolation steel plates are laid on the groove walls and the bottom of the groove, the size of the laid stirring pond is 10m multiplied by 20m, the depth is 3 m, and the sludge treatment amount per day is 1200m3；
(3) Sludge dredging
Determining the conditions of pool boundaries, excavation positions, depths and the like according to the coordinates, and selecting proper excavation equipment by combining the designed treatment capacity and the properties of the sludge;
(4) foreign matter separation
Placing the sludge in a stirring tank, and screening to remove foreign matters such as stones and impurities;
(5) sludge solidification treatment
According to the earlier stage sludge index detection data and the indoor sludge solidification experiment data results of the project, the selection and the addition of the curing agent are determined, the earlier stage experiment comprises a cone penetration test, a cross shear force test, a loss on ignition test, a heavy metal ion content test, an unconfined compressive strength test, a water content and wetting density test, a curing effect test, a COD value test and the addition amount (kg/m)3Added as a cubic sludge solidifying agent) of 150kg/m3The mode of adding the curing agent into the stirring tank can adopt a manual dosing mode, and can also adopt quantitative feeding stirring equipment to carry out full stirring while adding the curing agent layer by layer to the sludge in the stirring tank, thereby ensuring that the sludge and the curing agent are uniformly mixed and improving the operation efficiency;
(6) natural curing
Placing the sludge after solidification at a designated position, and carrying out natural curing for 20 days;
(7) sampling detection
Sampling cured sludge in batches after curing, and performing water content, pH value, strength and heavy metalTesting indexes such as precipitation, detecting whether the project reaches the standard to detect whether the project reaches the standard, periodically performing a quality management test on the solidified sludge in the construction process to confirm the soil property, and if not specifically stated, starting the test on the 7 th day after solidification treatment, wherein the frequency of the quality management test is 1 time/day of a water ratio test, 2 times/day of a wettability test, 2 times/day of a fluidity test, 1 time/day of a ph test and 1000m of treatment per cone penetration test3The sludge is subjected to primary unconfined compressive strength detection and is treated by 1000m each time3The sludge is subjected to one-time heavy metal precipitation experiment, and each treatment time is 2000m3The method is carried out once, and the required detection tests after completion comprise unconfined compressive strength detection (uniaxial compressive strength test), re-argillization test, soil pH value detection and heavy metal ion dissolution detection;
(8) backfilling
The solidified sludge can not be slimed, the precipitation of harmful substances (heavy metals) is inhibited, harmful bacteria, COD, BOD, phosphorus and the like in the sludge are removed, and safe backfilling can be carried out;
(9) greening
The pH value of the solidified sludge is 8, the solidified sludge is alkalescent, and vegetation planting can be uniformly carried out (direct planting on the surface layer of the solidified sludge or planting after natural soil is covered on the surface layer of the solidified sludge); if the planted plants have special requirements on the PH value, the expected effect can be achieved by adjusting the addition ratio of the curing agent.
Example 3:
a municipal sludge solidification ecological treatment process comprises the following process steps:
(1) preparation before construction
3 natural pools are solidified, 33058.30m is piled in a larger pile3Sludge, second stacking 9544.20m3The smallest stack is 2053.90m3After entering a field, firstly, cleaning and leveling the foundation, cleaning the foundation in a mode of combining mechanical cleaning and manual cleaning according to the field condition, wherein the depth of the foundation is 25cm, the impurities such as turf, tree roots and the like on the ground surface need to be removed, the impurities are transported to a waste soil field by a self-dumping truck loaded by an excavator, and after the foundation cleaning is finished, the ground is leveled, and according to the construction requirementBuilding a temporary road;
(2) is provided with a stirring tank
2 stirring ponds are arranged at proper places selected at a construction site, the stirring ponds adopt a ground digging groove form, isolation steel plates are laid on the groove walls and the bottom of the groove, the size of the laid stirring pond is 10m multiplied by 20m, the depth is 3 m, and the sludge treatment amount per day is 1200m3；
(3) Sludge dredging
Determining the conditions of pool boundaries, excavation positions, depths and the like according to the coordinates, and selecting proper excavation equipment by combining the designed treatment capacity and the properties of the sludge;
(4) foreign matter separation
Placing the sludge in a stirring tank, and screening to remove foreign matters such as stones and impurities;
(5) sludge solidification treatment
According to the earlier stage sludge index detection data and the indoor sludge solidification experiment data results of the project, the selection and the addition of the curing agent are determined, the earlier stage experiment comprises a cone penetration test, a cross shear force test, a loss on ignition test, a heavy metal ion content test, an unconfined compressive strength test, a water content and wetting density test, a curing effect test, a COD value test and the addition amount (kg/m)3Added with a cubic sludge solidifying agent) 225kg/m3The mode of adding the curing agent into the stirring tank can adopt a manual dosing mode, and can also adopt quantitative feeding stirring equipment to carry out full stirring while adding the curing agent layer by layer to the sludge in the stirring tank, thereby ensuring that the sludge and the curing agent are uniformly mixed and improving the operation efficiency;
(6) natural curing
Placing the sludge after solidification at a designated position, and carrying out natural curing for 20 days;
(7) sampling detection
Sampling cured sludge in batches after maintenance, testing indexes such as water content, pH value, strength, heavy metal precipitation and the like, detecting whether the engineering reaches the standard or not to detect whether the engineering reaches the standard or not, and periodically performing quality management test on the cured sludge in the construction process to confirm soil properties, such as soil propertiesUnless otherwise specified, the test was carried out on the 7 th day after the curing treatment, and the frequency of the quality control test was 1 water content ratio test/day, 2 wettability tests/day, 2 fluidity tests/day, 1 ph test/day, and 1000m treatment of the cone penetration test/day3The sludge is subjected to primary unconfined compressive strength detection and is treated by 1000m each time3The sludge is subjected to one-time heavy metal precipitation experiment, and each treatment time is 2000m3The method is carried out once, and the required detection tests after completion comprise unconfined compressive strength detection (uniaxial compressive strength test), re-argillization test, soil pH value detection and heavy metal ion dissolution detection;
(8) backfilling
The solidified sludge can not be slimed, the precipitation of harmful substances (heavy metals) is inhibited, harmful bacteria, COD, BOD, phosphorus and the like in the sludge are removed, and safe backfilling can be carried out;
(9) greening
The pH value of the solidified sludge is 8, the solidified sludge is alkalescent, and vegetation planting can be uniformly carried out (direct planting on the surface layer of the solidified sludge or planting after natural soil is covered on the surface layer of the solidified sludge); if the planted plants have special requirements on the PH value, the expected effect can be achieved by adjusting the addition ratio of the curing agent.
After completion, each example was extracted for analysis and compared to the prior art to obtain the following data:
according to the data in the table, when the parameters are obtained in the embodiment 3, the process parameters of the municipal sludge solidification ecological treatment process are that the sludge solidification strength is 2784KN/m3The pH value of the soil is 7.1, the dissolution amount of hexavalent chromium is 0mg/L, and the prior art standard is that the solidification strength of the sludge is 529KN/m3The pH value of the soil is 8.2, and the dissolution amount of hexavalent chromium is 0.05mg/L, so that the municipal sludge solidification ecological treatment process has the advantages that the solidified sludge strength is higher, the pH value of the soil is closer to neutral, and no hexavalent chromium is dissolved out, so that the municipal sludge solidification ecological treatment process has remarkable superiority.
The invention provides a municipal sludge solidification ecological treatment process, which comprises the following steps: preparing before construction, arranging a stirring pool, dredging sludge, separating foreign matters, solidifying sludge, naturally maintaining, sampling and detecting, backfilling, greening (direct greening/earthing greening), wherein the sludge solidifying agent is an inorganic material, the solidification mechanism is that hydrate needle crystals are generated through hydration and are combined with soil to form stable particle clusters so as to achieve the effect of changing the sludge property, the sludge solidifying technology can well inhibit the precipitation of heavy metal hexavalent chromium, and simultaneously, harmful substances (heavy metal ions) in the target soil are fixed, so that water quality pollution components such as harmful bacteria, BOD, COD, phosphorus and the like in the target soil are removed, the water quality of underground water/surface water is effectively protected, and worries of other soils caused by infectious pollution are avoided, and the early-stage experiment in the step (5) comprises a cone penetration test, a cone penetration, The method comprises the following steps of (1) a cross shear force test, a loss on ignition test, a heavy metal ion content test, an unconfined compressive strength test, a water content and wetting density test, a solidification effect test and a COD value measurement, wherein the tests can effectively detect the condition of sludge before solidification so as to calculate the accurate dosage, the quality management test to the solidified sludge is carried out regularly in the construction process of the step (7) to confirm the soil property, if the test is not carried out under the condition of special description, the test is carried out on the 7 th day after solidification treatment, the quality management test comprises a water content ratio test, a wettability test, a fluidity test, a ph test, a cone penetration test, an unconfined compressive strength test and a heavy metal precipitation test, and the frequency of the quality management test is 1 time/day of the water content ratio test, 2 times/day of the wettability test, 2 times/day of the fluidity test, and, ph test 1/day, cone penetration test 1000m per treatment3The sludge is subjected to primary unconfined compressive strength detection and is treated by 1000m each time3The sludge is subjected to one-time heavy metal precipitation experiment, and each treatment time is 2000m3The method can be carried out once, the properties of the solidified sludge can be objectively and accurately reflected, the detection tests required after the step (7) is completed comprise unconfined compressive strength detection (uniaxial compressive strength test), re-argillization test, soil pH value detection and heavy metal ion dissolution detection, and the method can be used for detecting the properties of the solidified sludge after completionAnd detecting the solidified sludge after construction so as to reflect the process effect of the method.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (6)
1. The municipal sludge solidification ecological treatment process is characterized by comprising the following steps:
(1) preparation before construction
After entering a field, firstly, cleaning and leveling, cleaning by adopting a mode of combining mechanical cleaning and manual cleaning according to the field condition, wherein the depth of the cleaning is 20-30cm, the impurities such as turf, tree roots and the like on the ground surface need to be removed, the impurities are transported to a waste soil field by a self-dumping truck loaded by an excavator, leveling the field after cleaning the base, and constructing a temporary road according to the construction requirement;
(2) is provided with a stirring tank
N stirring pools are arranged at proper places selected in a construction site, the stirring pools adopt a ground digging groove form, and isolation steel plates are laid on the walls and the bottom of the grooves;
(3) sludge dredging
Determining the conditions of pool boundaries, excavation positions, depths and the like according to the coordinates, and selecting proper excavation equipment by combining the designed treatment capacity and the properties of the sludge;
(4) foreign matter separation
Placing the sludge in a stirring tank, and screening to remove foreign matters such as stones and impurities;
(5) sludge solidification treatment
According to the earlier-stage sludge index detection data of the project and the indoor sludge solidification experiment data, the selection and the addition amount of a curing agent are determined, the dosage is determined, the mode of adding the curing agent into the stirring tank can adopt a manual dosing mode, and a quantitative feeding stirring device can also be adopted, so that the sludge in the stirring tank is fully stirred while the layered dosing is carried out, the sludge and the curing agent are uniformly mixed, and the operation efficiency is improved;
(6) natural curing
Placing the sludge after solidification at a designated position, and carrying out natural curing for 7-28 days;
(7) sampling detection
Sampling cured sludge in batches after maintenance is finished, testing indexes such as water content, pH value, strength, heavy metal precipitation and the like, and detecting whether the engineering reaches the standard or not so as to detect whether the engineering reaches the standard or not;
(8) backfilling
The solidified sludge can not be slimed, the precipitation of harmful substances (heavy metals) is inhibited, harmful bacteria, COD, BOD, phosphorus and the like in the sludge are removed, and safe backfilling can be carried out;
(9) greening
The pH value of the solidified sludge is 8-10, the sludge is alkalescent, and vegetation planting can be uniformly carried out (direct planting on the surface layer of the solidified sludge or planting after natural soil is covered on the surface layer of the solidified sludge); if the planted plants have special requirements on the PH value, the expected effect can be achieved by adjusting the addition ratio of the curing agent.
2. The municipal sludge solidification ecological treatment process according to claim 1, wherein the early stage experiment in the step (5) comprises a cone penetration experiment, a cross shear force experiment, a loss on ignition experiment, heavy metal ion content detection, unconfined compressive strength detection, water content and wetting density detection, solidification effect detection and COD value determination.
3. The municipal sludge solidification ecological disposal process according to claim 1, wherein the solidified sludge is subjected to quality control tests periodically during the construction of step (7), soil properties are confirmed, and if no special description is given, the tests are performed on the 7 th day after solidification treatment.
4. The municipal sludge solidification and ecological disposal process according to claim 3, wherein the quality management test comprises a water ratio test, a wettability test, a fluidity test, a ph test, a cone penetration test, unconfined compressive strength detection and a heavy metal precipitation test.
5. The municipal sludge solidification ecological treatment process according to claim 4, wherein the frequency of the quality management test is 1 water ratio test/day, 2 wettability test/day, 2 fluidity test/day, 1 ph test/day, 1000m treatment per cone penetration test3The sludge is subjected to primary unconfined compressive strength detection and is treated by 1000m each time3The sludge is subjected to one-time heavy metal precipitation experiment, and each treatment time is 2000m3Is carried out once.
6. The municipal sludge solidification ecological treatment process according to claim 1, wherein the tests required after completion of step (7) comprise unconfined compressive strength test (uniaxial compressive strength test), re-argillization test, soil pH value test and heavy metal ion dissolution test.
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| CN113351610A (en) * | 2021-06-24 | 2021-09-07 | 扬州杰嘉工业固废处置有限公司 | Industrial waste salt slag curing molding and landfill disposal method |
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