CN114890641A - Harmless recycling treatment method for sludge and application of treated sludge - Google Patents
Harmless recycling treatment method for sludge and application of treated sludge Download PDFInfo
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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
- C02F11/02—Biological treatment
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- 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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
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- Health & Medical Sciences (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of sludge treatment, and particularly relates to a harmless and recycling treatment method for sludge, which comprises the following steps: (1) pretreatment: adding a conditioner which accounts for 2 to 3 percent of the weight of the sludge into the sludge; (2) and (3) dehydrating: dehydrating with a membrane filter press under 1.4-1.6Mpa to obtain dehydrated mud cake; (3) aerobic fermentation: adding 0.1-0.5% of microorganism composite bacteria and 1-3% of biomass carbon into the dehydrated mud cake, performing aerobic fermentation at 55-85 deg.C for 3-7 days, drying, pulverizing, and sieving to obtain the nutrient soil. The invention also discloses application of the obtained nutrient soil in soil improvement. The method can obtain the nutrient soil while harmlessly recycling the sludge, and the nutrient soil can improve the soil.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a harmless and recycling treatment method for sludge.
Background
The sludge is a byproduct of a sewage treatment plant, and the sludge yield of the sewage treatment plant is increased along with the continuous improvement of the sewage treatment capacity and the sewage treatment rate. The sludge not only has high water content, is easy to rot and has strong odor, but also contains a large amount of pathogenic bacteria, parasitic ova, heavy metals such as chromium and mercury, and toxic and harmful substances and carcinogens which are difficult to degrade such as polychlorinated biphenyl, dioxin and the like. If the sewage is not strictly treated and is randomly discharged or buried, secondary pollution is easily caused to underground water, soil and the like through the erosion and seepage of rainwater, and the human health is directly harmed. At present, the water pollution is increasingly serious, and the water environment is increasingly worsened, a sewage treatment system which lacks the consideration of safe sludge treatment is incomplete and cannot meet the requirement of an environmental target, and the problem of secondary pollution caused by sludge is obvious day by day.
The current sludge treatment modes include the following:
sanitary landfill of sludge: since the 60's of the 20 th century, it was a relatively mature sludge disposal technology. The sludge can be buried either alone or together with domestic sludge and industrial waste. The treatment method is simple, easy to implement, low in cost, free from high dehydration of the sludge and strong in adaptability. Landfills are typically abandoned pits or natural depressions. However, sludge landfills also have problems, particularly with respect to landfill leachate and gas formation. Leachate is a heavily contaminated liquid which, if the landfill site is located or not operated properly, enters the underground aquifer and contaminates the groundwater environment. The gas produced by landfills is primarily methane, which may cause explosion and combustion if appropriate measures are not taken.
Direct land utilization of sludge: the direct utilization of sludge land is considered as a disposal mode with the most development potential due to the advantages of less investment, low energy consumption, low operating cost, conversion of organic parts into soil conditioner components and the like. However, the untreated sludge is directly applied to farmlands, parasitic ova and pathogenic microorganisms in the sludge have potential toxicity risks, which may cause serious pollution and toxicity to crops and soil, and even influence human health, and the popularization and use of the sludge are very difficult due to the overhigh water content.
And (3) incineration of sludge: the direct incineration of the dried wet sludge is common, and the direct incineration of sludge without drying is difficult, the investment of treatment facilities is large, the treatment cost is high, and the energy consumption is not economical.
Comprehensive utilization of building materials: it refers to the inorganic treatment of sludge, and is used for making cement additive, brick making, light aggregate and roadbed material. However, the utilization of the sludge building material meets the requirements of national and local relevant standards and regulations, and the secondary pollution caused in production and use is strictly prevented, so that the utilization cost is high, and the development resistance is large.
Sludge biological drying and composting: the biological drying of the sludge is an improvement of the traditional aerobic composting technology, and has better operability and an integrated system. The biological sludge drying process includes decomposing organic matter with aerobic bacteria in the material in proper C/N, water content, temperature, oxygen amount and other environment to decompose the material into organic fertilizer. During the process, the temperature of the material is increased to kill harmful bacteria. Under the action of temperature, the moisture in the material is diffused in the form of water vapor, so that the moisture content is reduced, and the method is advocated because the treatment cost is not high and certain economic benefit is achieved.
Although the sludge biological drying compost treatment mode has certain economic benefits and is advocated, the traditional sludge aerobic compost has the problems of slow temperature rise starting, long composting time, low dehydration efficiency, poor deodorization effect, poor heavy metal passivation effect and the like. In addition, the composting process is accompanied by a large amount of harmful gas emissions. The method not only reduces the agricultural value of aerobic composting, but also pollutes the atmosphere, harms human and animal health, aggravates greenhouse effect, brings acid rain harm, water eutrophication and other problems.
Therefore, it is very important to research and develop a safe and effective sludge treatment method to reduce, stabilize, make the sludge harmless and recycle the sludge.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for treating sludge in a harmless and recycling manner, which can safely and stably realize the harmless and recycling treatment of the sludge.
The technical scheme of the invention is as follows:
a method for treating sludge in a harmless and recycling manner comprises the following steps:
(1) pretreatment: adding a conditioner which accounts for 2 to 3 percent of the weight of the sludge into the sludge;
(2) and (3) dehydrating: dehydrating with a membrane filter press under 1.4-1.6Mpa to obtain dehydrated mud cake;
(3) aerobic fermentation: adding 0.1-0.5% of microorganism composite bacteria and 1-3% of biomass carbon into the dehydrated mud cake, performing aerobic fermentation at 55-85 deg.C for 3-7 days, drying, pulverizing, and sieving to obtain the nutrient soil.
The biomass charcoal is black charcoal with extremely rich carbon content, cannot disappear hundreds of years or thousands of years after being buried underground, can supplement the content of organic matters for soil and improve the fertility of the soil, and has a plurality of pore structures and very strong adsorption capacity. The biomass charcoal can be prepared from sludge by low-temperature cracking.
In the step (1), the water content of the sludge is 70-80%. In order to improve the later dehydration efficiency, a conditioner needs to be added into the sludge, because a lot of colloidal substances exist in the sludge, if the conditioner is not added, the sludge is difficult to precipitate or needs a long time for precipitation, the dehydration effect is influenced, the dehydration difficulty is increased, and the dehydration time is prolonged. After the conditioner is added, the precipitation of colloidal substances in the sludge is accelerated, and the later dehydration effect is improved.
According to the invention, biomass charcoal is added in the fermentation step (3), the fermentation effect is enhanced by virtue of the thermal stability, biochemical decomposition resistance, developed pore structure and huge specific surface area of the biomass charcoal, and the microorganism is combined with microorganism composite bacteria to convert organic matters in sludge into humus rich in plant growth through the metabolic action of the microorganism, wherein the final metabolite of the reaction is CO 2 、H 2 O and heat, a large amount of heat makes the material maintain continuous high temperature, reduce the moisture content of the material, kill pathogen, parasite (ovum) and weed seed effectively, the surface of the biomass charcoal is rich in various functional groups, make it have stronger chemical adsorption capacity, can adsorb heavy metal, harmful gas, etc., reduce the pollution, finally realize the reduction, stabilization, innocent purpose of the sludge treatment, the biomass charcoal has well-developed pore structure and huge specific surface area at the same time, can provide the place of living and breeding for the microorganism, have strengthened the aeration and water retention capacity of the fermentation process.
The factors influencing the sludge dewatering performance in the invention mainly comprise the size and distribution of sludge particles, surface charge, hydration degree and interaction among particles. The size of sludge particles is the most important factor influencing the sludge dewatering performance, because the smaller the sludge particles, the larger the specific surface area of the particles, which means higher hydration degree and greater dominance on filtration and the necessity of adding a conditioning agent for changing the sludge dewatering performance, and the dewatering effect can be improved by adding the conditioning agent, and the conditioning agent is preferably polyferric chloride or polyaluminum chloride.
The invention adopts the membrane filter press for dehydration, the water content of the dehydrated mud cake is 58-62%, the energy consumption is more saved than that of the traditional half-frame filter press, and the water requirement of the biological fermentation compost in the later stage of the sludge is ensured.
In order to obtain better fermentation effect, in the step (3) of the invention, the microorganism compound bacteria are preferably a mixture of streptococcus thermophilus, bacillus, actinomycetes and filamentous fungi in a weight ratio of 3:1:2:3, and the viable count of the microorganism compound bacteria is preferably 2 × 10 10 one/mL.
The nutrient soil obtained by aerobic fermentation has loose texture, the water content is 38-42%, the cation exchange capacity is obviously increased, the volume weight is reduced, and the nutrient components which can be utilized by plants are increased. The decomposition in the aerobic fermentation process mainly utilizes thermophilic bacteria to oxidize and decompose organic matters and release a large amount of energy, the organic matters are biochemically degraded while heat is generated, and the temperature of fermentation materials can be raised to over 55 ℃, so that pathogenic bacteria and parasites (eggs) die. The synergistic effect of the microbial compound bacteria and the biomass charcoal added in the aerobic fermentation process enhances the fermentation by means of the thermal stability, the biochemical decomposition resistance, the developed pore structure and the huge specific surface area of the biomass charcoal, and effectively solves the problems of slow temperature rise starting, long composting time, low dehydration efficiency, poor deodorization effect, poor heavy metal passivation effect and the like of the traditional sludge aerobic composting. In addition, the traditional aerobic composting process is accompanied by a large amount of harmful gas emission, which not only reduces the agricultural value of the aerobic composting, but also pollutes the atmosphere, harms the health of people and livestock, aggravates the greenhouse effect, brings the problems of acid rain harm, water eutrophication and the like.
The application of the nutrient soil obtained by the sludge harmless and resource treatment method in land improvement can improve the quality of the soil, reduce the content of heavy metals in the soil and improve the yield and quality of crops.
In the application for land improvement, the application amount of the nutrient soil is preferably 60 tons/667 m 2 . The crop growth vigor is the best, the survival rate is the best, the cadmium content of the crop is the least, the lead content is below the limit value of 0.1mg/kg of total lead in pollutant Limit in food (GB2762-2012) and is in a normal safety range, and the data of the total cadmium, the total mercury, the total arsenic, the total lead and the total chromium in the soil do not exceed the soil pollution risk control value of the agricultural land.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, when sludge is treated, the biomass charcoal is added in aerobic fermentation, microorganisms can utilize the thermal stability, biochemical decomposition resistance, developed pore structure and huge specific surface area of the biomass charcoal, and meanwhile, the biomass charcoal is added to supplement a carbon source, so that the decomposition rate of the microorganisms on organic carbon is improved, the microorganisms are promoted to fix more ammonium nitrogen into organic nitrogen, the nitrogen loss is reduced, the fermentation performance is enhanced, and the nutrient soil capable of improving soil is obtained.
2. In the invention, a microorganism compound strain is added in aerobic fermentation, wherein microorganisms convert organic matters in sludge into humus rich in plant growth through the metabolism of the microorganisms in the aerobic fermentation process, and the final metabolite of the reaction is CO 2 、H 2 O and heat, and a large amount of heat enables the materials to maintain continuous high temperature, reduces the water content of the materials, effectively kills pathogens, parasites (eggs) and weed seeds, and finally achieves the aims of reduction, stabilization and harmlessness of sludge treatment.
3. The method can solve the problems of slow temperature rise starting, long composting time, low dehydration efficiency, poor deodorization effect, poor heavy metal passivation effect, harmful gas generation and the like of the conventional sludge aerobic composting, and realizes the harmless and resource treatment of the sludge.
Drawings
FIG. 1 is a schematic diagram of the process of example 1 of the present invention.
FIG. 2 shows the monitoring results of the nutrient soil of example 1 of the present invention.
FIG. 3 is a graph of the yield of sugarcane corresponding to the application amount of different nutrient soils in the application of the nutrient soils.
FIG. 4 is a graph showing the content of heavy metal elements in soil according to the application amount of different nutrient soils after the nutrient soils are improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for treating sludge in a harmless and recycling manner comprises the following steps:
(1) pretreatment: conveying sludge of a sewage treatment plant into a sludge storage tank, diluting the sludge until the water content is 75%, and adding polyferric chloride accounting for 2.5% of the weight of the sludge;
(2) and (3) dehydrating: dehydrating the waste water by a membrane filter press under the pressure of 1.5Mpa to obtain dehydrated mud cakes with the tax rate of 60 percent, partially returning the treated organic filter-pressing waste water to dilute the sludge, and transporting the rest to a south China sewage treatment plant in Nanning city for treatment;
(3) aerobic fermentation: adding viable bacteria with a viable count of 2 × 10 to the dewatered mud cake at 0.3 wt% 10 The microorganism composite bacteria (the mixture of streptococcus thermophilus, bacillus, actinomycetes and filamentous fungi in a weight ratio of 3:1:2: 3) and biomass charcoal with the weight of 2% of the weight of the dehydrated mud cake are aerobically fermented for 5 days at the temperature of 60 ℃, dried, crushed and sieved to obtain the nutrient soil with the water content of 40%, and the monitoring result is shown in figure 2.
Example 2
A method for treating sludge in a harmless and recycling manner comprises the following steps:
(1) pretreatment: conveying sludge of a sewage treatment plant into a sludge storage tank, diluting the sludge until the water content is 70%, and adding polyaluminium chloride accounting for 2% of the weight of the sludge;
(2) and (3) dehydrating: dehydrating the waste water by a membrane filter press under the pressure of 1.4Mpa to obtain dehydrated mud cakes with the tax rate of 58 percent, and transporting the organic filter-pressing waste water to a south Jiangnan sewage treatment plant of Nanning city for treatment;
(3) aerobic fermentation: adding viable bacteria with a viable count of 2 × 10 to the dewatered mud cake at 0.1 wt% 10 Microbial composite bacteria (mixture of streptococcus thermophilus, bacillus, actinomycetes and filamentous fungi in a weight ratio of 3:1:2: 3) and dehydration per mLAnd (3) carrying out aerobic fermentation for 7 days at the temperature of 55-65 ℃ on biomass charcoal with the weight of 3% of the mud cake, drying, crushing and screening to obtain the nutrient soil with the water content of 38%.
Example 3
A method for treating sludge in a harmless and recycling manner comprises the following steps:
(1) pretreatment: conveying sludge of a sewage treatment plant into a sludge storage tank, diluting the sludge until the water content is 80%, and adding polyaluminium chloride accounting for 3% of the weight of the sludge;
(2) and (3) dehydrating: dehydrating the waste water by a membrane filter press under the pressure of 1.6Mpa to obtain dehydrated mud cakes with the tax rate of 62 percent, and transporting the organic filter-pressing waste water to a south Jiangnan sewage treatment plant of Nanning city for treatment;
(3) aerobic fermentation: adding viable bacteria with a viable count of 2 × 10 to the dewatered mud cake at 0.5 wt% 10 Performing aerobic fermentation on microbial composite bacteria (a mixture of streptococcus thermophilus, bacillus, actinomycetes and filamentous fungi in a weight ratio of 3:1:2: 3) and biomass charcoal accounting for 2% of the weight of the dewatered mud cake at 55-65 ℃ for 7 days, drying, crushing and screening to obtain the nutrient soil with the water content of 42%.
Example 4
The treated sludge obtained in example 1 was applied as nutrient soil for improvement to a mine test site, and 6 different treatments (0, 10, 30, 60, 90 and 120 tons/mu of nutrient soil were applied) were repeated 3 times per treatment. Sugarcane is planted in each treated area, and the method for planting the sugarcane in each treatment is consistent.
(1) Determination of sugarcane plant height
TABLE 1 sugarcane plant height on different dates
| Amount of nutrient soil applied/(ton/667 m) 2 ) | 12 month and 25 days 2018 | Year 2019, |
| 0 | 91.92±18.82 | 100.20±5.01 |
| 10 | 112.78±11.10 | 134.80±10.43 |
| 30 | 114.31±11.49 | 137.14±8.40 |
| 60 | 135.47±35.23 | 144.87±21.59 |
| 90 | 108.33±1.67 | 141.33±6.72 |
| 120 | 113.56±20.65 | 151.33±22.00 |
(2) Survival rate of sugarcane measured in 2019, 3, month and 22 days
TABLE 22019 sugarcane survival Rate 3 months and 22 days
| Amount of nutrient soil applied/(ton/667 m) 2 ) | Survival rate/%) |
| 0 | 71.88±14.14 |
| 10 | 71.41±4.12 |
| 30 | 74.22±9.69 |
| 60 | 81.69±5.63 |
| 90 | 78.97±3.85 |
| 120 | 75.27±10.48 |
(3) Sugarcane yield status
Table 32019 year 3 month 22 day sugarcane product status
| Amount of nutrient soil applied/(ton/667 m) 2 ) | Sugarcane yield/ |
| 0 | 86.90±24.92 |
| 10 | 155.63±52.95 |
| 30 | 180.63±34.86 |
| 60 | 218.87±12.40 |
| 90 | 224.07±67.99 |
| 120 | 285.83±138.11 |
(4) After the sugarcane is planted, the heavy metal content of the soil after the mine soil restoration is measured in 2019, and the result is shown in table 4.
TABLE 4 heavy metal content of mine soil after remediation
(5) Determination of total cadmium and chromium content in sugarcane juice
TABLE 5 Total cadmium and Total chromium content in sugarcane juice
| Amount of nutrient soil applied/(ton/667 m) 2 ) | Total cadmium/(mg/kg) | Total chromium/(mg/kg) |
| 0 | 0.038±0.039 | 0.044±0.015 |
| 10 | 0.032±0.016 | 0.052±0.021 |
| 30 | 0.021±0.011 | 0.022±0.003 |
| 60 | 0.022±0.003 | 0.025±0.010 |
| 90 | 0.016±0.010 | 0.021±0.011 |
| 120 | 0.033±0.20 | 0.030±0.011 |
As can be seen from Table 1, in the description of the plant height of sugarcane in 12 months and 25 days in 2018, the addition amount of nutrient soil is 60 tons/667 m 2 When the sugarcane is planted, the height of the sugarcane is highest; in 2019, 3 and 22 months, the amount of the nutrient soil is 120 tons/667 m 2 The height of the sugarcane is the highest, and is 60 tons/667 m in the addition amount of the nutrient soil 2 The height of the sugarcane is several centimeters, but the dosage of the nutrient soil is doubled.
As can be seen from Table 2, the amount of the nutrient soil added is 60 tons/667 m 2 When the sugarcane is used, the corresponding sugarcane has the highest survival rate. The data in Table 3 are plotted, and as can be seen in FIG. 3, the overall trend of the mean value of sugarcane yield increases with increasing nutrient soil, 60 tons/667 m 2 And 90 tons/667 m 2 The total yield is small in difference and the increase is gentle.
The data in table 4 are converted into a graph, as can be seen in fig. 4:
total mercury in soil: the total mercury content of the soil in the experimental planting field along with the addition amount of different amounts of nutrient soil generally tends to increase and decrease, then decrease, increase and decrease, two peaks and one trough appear, a minimum value appears when the application amount of the nutrient soil is 60 tons/mu, and maximum values appear when the application amount of the nutrient soil is 30 tons/mu and 90 tons/mu;
total lead in soil: the total lead content in the soil changes along with the change of the application amount of the nutrient soil, the total lead content is the highest when the application amount of the nutrient soil is 10 tons/mu, and the total lead content in the soil is the lowest when the application amount of the nutrient soil is 90 tons/mu. The total lead in the soil with different amounts of nutrient soil added is increased firstly, then reduced and then increased, a peak and a trough appear, the maximum value appears when the application amount of the nutrient soil is 10 tons/mu, and the minimum value appears when the application amount of the nutrient soil is 90 tons/mu;
total cadmium in soil: the total cadmium content in the soil changes along with the change of the application amount of the nutrient soil, the total cadmium content is highest when the application amount of the nutrient soil is 90 tons/mu, the total cadmium content of the soil is lowest when the application amount of the nutrient soil is 0 tons/mu, namely the total cadmium in the background value of the soil in the mining area is smaller, and the high concentration total cadmium is introduced by using the nutrient soil with the high total cadmium content in the nutrient soil. The total cadmium in the soil with different amounts of nutrient soil added is increased firstly, then decreased, then increased and then decreased, two peaks and one trough appear, the maximum value appears when the nutrient soil is applied in an amount of 20 tons/mu and 90 tons/mu, and the minimum value appears when the nutrient soil is applied in an amount of 60 tons/mu;
total chromium in soil: the total chromium in the soil with different amounts of nutrient soil addition is reduced firstly, then increased, reduced secondly and increased, one peak and two troughs appear, the maximum value appears when the nutrient soil application amount is 60 tons/mu, and the minimum value appears when the nutrient soil application amount is 30 tons/mu and 90 tons/mu.
Total arsenic in soil: the total arsenic content in the soil changes along with the change of the application amount of the nutrient soil, the total arsenic content is the highest when the application amount of the nutrient soil is 10 tons/mu, and the total chromium content in the bagasse is the lowest when the application amount of the nutrient soil is 90 tons/mu. The total arsenic in the soil with different amounts of nutrient soil is increased firstly, then decreased and then increased, a peak and a trough appear, the maximum value appears when the nutrient soil is applied in an amount of 10 tons/mu, and the minimum value appears when the nutrient soil is applied in an amount of 90 tons/mu.
From the data in table 5, it can be seen that the total cadmium and chromium content in the sugarcane juice are both below the limit of 0.1mg/kg, which is defined in the "limit of pollutants in food" (GB2762-2012), and are within the normal safety range.
In conclusion, from the aspects of the plant height and the survival rate of the sugarcane, the application amount of the nutrient soil in the land improvement is 60 tons/667 m 2 Is the best choice.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (9)
1. A method for treating sludge in a harmless and recycling manner is characterized by comprising the following steps:
(1) pretreatment: adding a conditioner which accounts for 2 to 3 percent of the weight of the sludge into the sludge;
(2) and (3) dehydrating: dehydrating with a membrane filter press under 1.4-1.6Mpa to obtain dehydrated mud cake;
(3) aerobic fermentation: adding 0.1-0.5% of microorganism composite bacteria and 1-3% of biomass carbon into the dehydrated mud cake, performing aerobic fermentation at 55-85 deg.C for 3-7 days, drying, pulverizing, and sieving to obtain the nutrient soil.
2. The method for harmless and recycling treatment of sludge according to claim 1, wherein: the conditioner is polyferric chloride or polyaluminium chloride.
3. The method for harmless and recycling treatment of sludge according to claim 1, wherein: in the step (1), the water content of the sludge is 70-80%.
4. The method for harmless and recycling treatment of sludge according to claim 1, wherein: in the step (2), the water content of the obtained dehydrated mud cake is 58-62%.
5. The method for harmless and recycling treatment of sludge according to claim 1, wherein: in the step (3), the microorganism compound bacteria are a mixture of streptococcus thermophilus, bacillus, actinomycetes and filamentous fungi in a weight ratio of 3:1:2: 3.
6. The method for harmless and recycling treatment of sludge according to claim 5, wherein: the viable count of the microorganism composite bacteria is 2 multiplied by 10 10 one/mL.
7. The method for harmless and recycling treatment of sludge according to claim 1, wherein: in the step (3), the moisture content of the obtained nutrient soil is 38-42%.
8. Use of the nutrient soil obtained by the harmless recycling treatment method of sludge according to any one of claims 1 to 7 in soil improvement.
9. The use of claim 8, wherein the nutrient soil is applied in an amount of 60 tons/667 m 2 。
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Cited By (2)
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| CN116138135A (en) * | 2022-12-12 | 2023-05-23 | 广西新硕展环保科技有限公司 | Method and device for producing nutrient soil by utilizing sludge of sewage treatment plant |
| CN117461542A (en) * | 2023-09-08 | 2024-01-30 | 华南理工大学 | A method of dehydrating sludge and recycling it to produce nutrient soil containing humic acid and its application |
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