CN111618069A - Method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes - Google Patents

Method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes Download PDF

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Publication number
CN111618069A
CN111618069A CN202010454761.XA CN202010454761A CN111618069A CN 111618069 A CN111618069 A CN 111618069A CN 202010454761 A CN202010454761 A CN 202010454761A CN 111618069 A CN111618069 A CN 111618069A
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China
Prior art keywords
sludge
agricultural
mixed
mixing
forestry
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CN202010454761.XA
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CN111618069B (en
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田国玉
霍燚
李静
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Tianjin Tiandi Fengyuan Environmental Engineering Co Ltd
Beijing Tiandi Fengyuan Environmental Protection Technology Co ltd
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Tianjin Tiandi Fengyuan Environmental Engineering Co Ltd
Beijing Tiandi Fengyuan Environmental Protection Technology Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste or contaminated solids into something useful or harmless
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/58Construction or demolition [C&D] waste

Abstract

The invention belongs to the technical field of waste treatment, and particularly relates to a method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes.

Description

Method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes
Technical Field
The invention belongs to the technical field of waste treatment, and particularly relates to a method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes.
Background
The sewage is waste in the industrial production process, the environmental protection inspection is more and more strict along with the promotion of the large-scale production of industrial industry in China, the industrial sewage is basically recycled, can not be utilized and also has strict discharge standards, each enterprise also has own sewage treatment facility, the finally concentrated mud cake sludge usually needs to be burnt or buried, but higher cost can be input and can not be well utilized, the sludge can be classified and treated like garbage classification, China already has the basic condition of sewage classification, and the sludge can be applied to different aspects by adopting different processes by utilizing the characteristics of the sludge after being classified; in the same way, the burning of the straws in rural areas can cause air pollution, and the straws need to be smashed and returned to the field, thus manpower and material resources are needed to be input.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes, which can be used for carrying out soil regeneration on classified sludge by adopting a proper process to obtain sludge plant-growing concrete water storage particles and better utilize wastes such as sludge and the like.
The invention adopts the specific technical scheme that: a method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes is characterized by comprising the following steps:
A. the sludge is divided into domestic sludge and industrial sludge;
3-4% of cementing curing agent, 5-6% of swelling agent and 3-5% of heavy metal passivator are added into the domestic sludge according to the total water content (50-60%) of the domestic sludge, the building garbage, the branches and leaves of the agricultural and forestry straws and are uniformly mixed; mixing the RW quick-rotting agent and the powdery material according to a ratio of 1:6, adding diammonium phosphate with the mass content of 5% to prepare the dioxygen fermentation quick-rotting agent, and adding the dioxygen fermentation quick-rotting agent by one ten thousandth of the total mixed material amount; uniformly and fully stirring and mixing by adopting a step-by-step mixing method to obtain a first-stage mixed material, and controlling the water content of the first-stage mixed material to be below 60%;
adding 4-5% of cementing curing agent, 7-8% of swelling agent and 5-6% of heavy metal passivator into the industrial sludge according to the total water content (50-60%) of the industrial sludge, the construction waste, the branches and leaves of the agricultural and forestry straws and uniformly mixing; mixing the RW quick-rotting agent and the powdery material according to a ratio of 1:6, adding diammonium phosphate with the mass content of 5% to prepare the dioxygen fermentation quick-rotting agent, and adding the dioxygen fermentation quick-rotting agent by one ten thousandth of the total mixed material amount; uniformly and fully stirring and mixing by adopting a step-by-step mixing method to obtain a first-stage mixed material, and controlling the water content of the first-stage mixed material to be below 60%;
B. piling the primary mixed material prepared in the step A into a large stack, sealing the stack with a waterproof breathable film, and performing curing maintenance and facultative fermentation retting training to obtain a secondary mixed material;
C. and D, adding the composite conditioning material and the trace elements into the secondary mixed material obtained in the step B, and adding a hydrolyzed polymaleic anhydride organic aqueous solution with the mass ratio of 1: 500 in the mixing and stirring process to adjust the pH value to be in a range of 6-7.5 required by the plant growth conditions.
The raw materials are sludge, construction waste and branches and leaves of agricultural and forestry straws; the powder is one or at least two of mushroom residue, sawdust and bran coat; the composite conditioning material comprises calcium superphosphate, humic acid-containing substances, ferrous sulfate and vinegar residue; the microelements comprise ammonium phosphate sulfate, ammonium sulfate, zinc sulfate, magnesium sulfate, borax and calcium nitrate.
As a further scheme, the composite conditioning material comprises, by weight, 15-30% of calcium phosphate, 20-30% of humic acid-containing substances, 10-20% of ferrous sulfate and 20-30% of vinegar residues.
As a further scheme, the trace elements comprise the following components in percentage by weight: 25-45% of ammonium sulfate, 20-45% of ammonium sulfate, 2-8% of zinc sulfate, 4-10% of magnesium sulfate, 2-10% of borax and 3-7% of calcium nitrate.
As a further scheme, the raw materials comprise, by weight, 40-60% of sludge, 20-30% of construction waste and 30-40% of branches and leaves of agricultural and forestry straws.
The invention has the beneficial effects that: the sludge plant-growing concrete water storage particles prepared according to the steps of the invention can kill germs, worm eggs and weed seeds in sludge and excrement through training high temperature in the retting process. The high-efficiency beneficial microorganisms in the hydrogen peroxide fermentation fast-decomposing agent can propagate in a large amount in the retting process and after being applied to soil, so that the pathogenic fungi in the soil can be inhibited and killed for a long time, the disease resistance of crops is enhanced, the absorption of trace elements of nitrogen, phosphorus and potassium is promoted, and the rapid growth of plants is stimulated;
after the curing agent and the swelling agent are added for treatment, the material has good compression and lateral pressure resistant engineering performance, the porosity is increased by more than 20%, and the material has certain water storage, water filtration and slow-release humid air effects, and rainwater flood discharge and air purification can be reduced by using the ecological finished product of the sludge-plant concrete water storage particles, so that the sponge volume for ecological environment construction is supplemented;
after aerobic composting, the physical and chemical properties are stable, the content of organic matters reaches 30 to 50 percent, and the organic matters contain rich nutrient elements such as nitrogen, phosphorus, potassium and the like, and are available for plants. After the harmful heavy metals in the sludge are treated by adding the passivating agent and the curing agent, the toxic leaching amount of the harmful heavy metals is lower than the restriction standard of landscaping and land improvement in China, and the resource recycling of common solid wastes is realized.
The invention has low manufacturing cost and simple manufacturing method, and is beneficial to technical popularization and promotion.
Detailed Description
The technology aims to utilize the ecological and physical basic structural characteristics and universality of sludge, construction waste and agricultural and forestry waste to culture and build the regenerated soil with ecological and engineering functional properties, and focuses on the research on the soil functionality on the basis that the sludge, construction waste and agricultural and forestry waste treatment technology is mature, and focuses on the solidification and expansion treatment process.
The technology is not very strict in sludge selection, the use direction of the regenerated soil is selected according to the applicable property of the sludge, and the technology is suitable for sludge disposal mixed landfill sludge of urban sewage treatment plants, wherein the sludge is in accordance with sludge disposal landscaping mud of urban sewage treatment plants (GB-T23486-2009), sludge improvement mud of sludge disposal soil of urban sewage treatment plants (GB/T24600-2018), and sludge disposal mixed landfill sludge of urban sewage treatment plants (GBT 23485 one 2009)
Technical process range.
First, preparation of experiment
The technology tests relevant contents of experimental projects under the condition of different addition amounts of the curing agent cementing material, and provides basis for the applicability and design of the regenerated soil; and (4) selecting the type of the curing agent by combining an experimental analysis test, determining the addition amount of the curing agent cementing material, and providing a basis for the use direction of the regenerated soil. In the following experiments, a deep experiment is carried out by mainly starting from a curing agent formula and combining different material proportions so as to obtain higher strength and compactness. The following are the optimum formula of different materials and the experimental results of 6-day dry pressure and water-soaking unconfined compressive strength.
Second, experimental data
Considering that the compactness of the powder is not enough after being made into test blocks, the powder is easy to break, and the water soaking effect is influenced, three groups of experiments are specially made, and the water soaking effect is compared by adding additives in different proportions.
Table 1: experiment proportioning table
The experiment aims at different proportions of briquetting, maintenance and measurement experiments among mixed materials, curing agents, passivating agents and swelling agents of the regenerated soil.
In 3 experiments, dry pressure and soak measurements were performed on test blocks of different ages, 7 days, 14 days, and 28 days.
Third, hit real test data
Table 2: material property description and compaction test data
Description of the samples Optimum Water content (%) Maximum dry Density (g/cm)3)
Compression block 15.5 1.89
Fourth, Water stability test
Table 3: dry pressure and water soaking strength comparison table
From the above data it can be seen that:
a. the dry pressing strength of the curing agent is low due to less added test blocks, and the curing agent is easy to foam and disperse after being soaked in water and is difficult to form;
b. under the condition that the using amounts of the sludge, the construction waste and the straw powder are the same, the additive is correspondingly increased in proportion, the dry pressing strength of the test block is gradually improved, the dry pressing strength is increased by nearly one time at high time, and the water soaking effect is ideal.
Fifth, testing physical and chemical indexes
Table 4: physical and chemical indexes of regenerated soil
Sixth, conclusion of the experiment
Experiments show that the addition of the curing agent with high proportion improves the dry-pressing strength of the test block by nearly one time, and the water soaking effect is more ideal. The curing agent is small in dosage and not high in relative strength, and the reason is that the soil test block is few in viscous molecules, so that the compactness of the cured soil is reduced, and the cured soil is easy to loosen after encountering moisture. Under the simultaneous action of the curing agent, the passivating agent and the swelling agent, the leaching of harmful heavy metals is effectively inhibited, the thorough extermination of the eggs of the disease insects can be promoted, and the physical and biological functions of the soil are retained and enhanced. The method is used for improving the soil and building materials in the soil-based mine of sludge, construction waste and agricultural and forestry waste.

Claims (4)

1. A method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes is characterized by comprising the following steps:
A. the sludge is divided into domestic sludge and industrial sludge;
3-4% of cementing curing agent, 5-6% of swelling agent and 3-5% of heavy metal passivator are added into the domestic sludge according to the total water content (50-60%) of the domestic sludge, the building garbage, the branches and leaves of the agricultural and forestry straws and are uniformly mixed; mixing the RW quick-rotting agent and the powdery material according to a ratio of 1:6, adding diammonium phosphate with the mass content of 5% to prepare the dioxygen fermentation quick-rotting agent, and adding the dioxygen fermentation quick-rotting agent by one ten thousandth of the total mixed material amount; uniformly and fully stirring and mixing by adopting a step-by-step mixing method to obtain a first-stage mixed material, and controlling the water content of the first-stage mixed material to be below 60%;
adding 4-5% of cementing curing agent, 7-8% of swelling agent and 5-6% of heavy metal passivator into the industrial sludge according to the total water content (50-60%) of the industrial sludge, the construction waste, the branches and leaves of the agricultural and forestry straws and uniformly mixing; mixing the RW quick-rotting agent and the powdery material according to a ratio of 1:6, adding diammonium phosphate with the mass content of 5% to prepare the dioxygen fermentation quick-rotting agent, and adding the dioxygen fermentation quick-rotting agent by one ten thousandth of the total mixed material amount; uniformly and fully stirring and mixing by adopting a step-by-step mixing method to obtain a first-stage mixed material, and controlling the water content of the first-stage mixed material to be below 60%;
B. piling the primary mixed material prepared in the step A into a large stack, sealing the stack with a waterproof breathable film, and performing curing maintenance and facultative fermentation retting training to obtain a secondary mixed material;
C. and D, adding the composite conditioning material and the trace elements into the secondary mixed material obtained in the step B, and adding a hydrolyzed polymaleic anhydride organic aqueous solution with the mass ratio of 1: 500 in the mixing and stirring process to adjust the pH value to be in a range of 6-7.5 required by the plant growth conditions.
The raw materials are sludge, construction waste and branches and leaves of agricultural and forestry straws; the powder is one or at least two of mushroom residue, sawdust and bran coat; the composite conditioning material comprises calcium superphosphate, humic acid-containing substances, ferrous sulfate and vinegar residue; the microelements comprise ammonium phosphate sulfate, ammonium sulfate, zinc sulfate, magnesium sulfate, borax and calcium nitrate.
2. The method for preparing regenerated soil from municipal sludge and agricultural and forestry residues according to claim 1, wherein the composite conditioning material comprises, by weight, 15-30% of calcium phosphate, 20-30% of humic acid-containing substances, 10-20% of ferrous sulfate and 20-30% of vinegar residue.
3. The method for preparing the regenerated soil by adopting the municipal sludge and the agricultural and forestry wastes according to claim 1, wherein the trace elements comprise the following components in percentage by weight: 25-45% of ammonium sulfate, 20-45% of ammonium sulfate, 2-8% of zinc sulfate, 4-10% of magnesium sulfate, 2-10% of borax and 3-7% of calcium nitrate.
4. The method for preparing regenerated soil by using municipal sludge and agricultural and forestry wastes according to claim 1, wherein the raw materials comprise, by weight, 40-60% of sludge, 20-30% of construction wastes and 30-40% of branches and leaves of agricultural and forestry straws.
CN202010454761.XA 2020-05-26 2020-05-26 Method for preparing regenerated soil by adopting municipal sludge and agricultural and forestry wastes Active CN111618069B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020035858A1 (en) * 2000-04-14 2002-03-28 Forsha Chris A. Treatment of sludge and animal wastes
CN1467178A (en) * 2002-06-28 2004-01-14 张传镁 Slag sintered aggregate and preparation method thereof
JP2007175556A (en) * 2004-06-17 2007-07-12 One Uiru:Kk Method for producing novel material with highly functional capability from waste diatomaceous earth, and novel material with highly functional capability by the waste diatomaceous earth
CN103693910A (en) * 2013-12-05 2014-04-02 青岛润国生态科技发展有限公司 Vegetation concrete for promoting plant growth
CN105861285A (en) * 2016-06-03 2016-08-17 北京峻德安装工程有限公司 Utilization system of municipal sewage sludge, park waste and rural straw waste as resources
CN108059991A (en) * 2017-08-21 2018-05-22 重庆大雨水生态科技有限公司 A kind of New-type fuel and brick, haydite, cement, fiberboard based on heavy metal sewage sludge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020035858A1 (en) * 2000-04-14 2002-03-28 Forsha Chris A. Treatment of sludge and animal wastes
CN1467178A (en) * 2002-06-28 2004-01-14 张传镁 Slag sintered aggregate and preparation method thereof
JP2007175556A (en) * 2004-06-17 2007-07-12 One Uiru:Kk Method for producing novel material with highly functional capability from waste diatomaceous earth, and novel material with highly functional capability by the waste diatomaceous earth
CN103693910A (en) * 2013-12-05 2014-04-02 青岛润国生态科技发展有限公司 Vegetation concrete for promoting plant growth
CN105861285A (en) * 2016-06-03 2016-08-17 北京峻德安装工程有限公司 Utilization system of municipal sewage sludge, park waste and rural straw waste as resources
CN108059991A (en) * 2017-08-21 2018-05-22 重庆大雨水生态科技有限公司 A kind of New-type fuel and brick, haydite, cement, fiberboard based on heavy metal sewage sludge

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