CN112745152A - Synchronous recycling method for algae sludge salvaged in water body and aerobic composting of desilting bottom sludge - Google Patents
Synchronous recycling method for algae sludge salvaged in water body and aerobic composting of desilting bottom sludge Download PDFInfo
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- CN112745152A CN112745152A CN202011513918.8A CN202011513918A CN112745152A CN 112745152 A CN112745152 A CN 112745152A CN 202011513918 A CN202011513918 A CN 202011513918A CN 112745152 A CN112745152 A CN 112745152A
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- 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
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- 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
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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
Abstract
The invention discloses a synchronous recycling method for aerobic composting of algae sludge and dredging bottom sludge by fishing algae sludge in a water body, wherein the aerobic composting is carried out by taking a mixture of the algae sludge and the dredging bottom sludge as a main material and sawdust as an auxiliary material; the desilting bottom mud, the algae mud and the auxiliary material sawdust are mixed according to the following mass fraction: 4-8 parts of dredging bottom mud, 1-2 parts of algae mud and 1-2 parts of sawdust. Aiming at the characteristics of high water content and high organic matter content of the algae sludge, and the characteristics of poor water retention and low organic matter content of the dredging bottom sludge, the invention adopts the mixture of the algae sludge and the dredging bottom sludge as the aerobic composting material, is supplemented with sawdust auxiliary materials, limits the components of each composting material in a specific range, and realizes the synchronous recycling of the algae sludge and the dredging bottom sludge under the synergistic action of each component.
Description
Technical Field
The invention belongs to the technical field of resource utilization, and particularly relates to a synchronous resource method for algae sludge salvage and sediment dredging aerobic composting in a water body.
Background
The eutrophic water covered water contains a large amount of algae, and bottom mud is seriously polluted. In the treatment process of the eutrophic water body, algae needs to be salvaged and polluted bottom mud needs to be dredged, so that a large amount of algae mud and desilted bottom mud are generated. The algae mud is rich in organic matters, nitrogen and phosphorus; the dredging bottom sediment is rich in nitrogen, phosphorus, functional microorganisms and pathogenic microorganisms. The algae mud and the desilting bottom mud are recycled, so that the secondary pollution of the algae mud and the desilting bottom mud to the water body is effectively avoided, the treatment effect of the eutrophic water body is ensured, and meanwhile, the obvious economic effect is generated.
Aerobic composting is a common method for resource utilization of algae mud. Due to the high water content of the algae mud, the compost is slow in temperature rise, difficult to maintain in a high-temperature stage, low in seed germination rate of compost products and difficult to meet the corresponding national standard. Therefore, mechanical dewatering of the algae mud or addition of auxiliary materials such as sawdust, rice hulls, wheat bran, rice bran and the like is often necessary to reduce the water content of the stack. Aerobic composting is also a common method for resource utilization of desilting bottom mud. However, the desilting bottom mud has high sand content and poor water retention, and the water content of the pile body is often not up to the requirement of aerobic composting. Meanwhile, the content of organic matters in the desilting bottom mud is low, so that the proliferation of microorganisms in the pile body is difficult to maintain, and the pathogenic microorganisms cannot be inactivated for a continuous time period at a high-temperature stage. In order to solve the problem of low organic matter content of the dredging bottom mud, a large amount of auxiliary materials such as livestock and poultry manure, straws and the like have to be added, and even the dosage of the auxiliary materials is far higher than that of the dredging bottom mud.
In conclusion, there is a need for an improved method for recycling algae sludge and bottom sludge.
Disclosure of Invention
The invention mainly aims to provide a method for realizing synchronous reclamation of algae sludge salvaged by eutrophic water and sediment dredging and dredging.
In order to solve the technical problems, the invention adopts the following technical scheme:
a synchronous recycling method for algae sludge salvaged in water and aerobic composting of dredging bottom sludge is characterized in that a mixture of algae sludge and dredging bottom sludge is used as a main material, and sawdust is used as an auxiliary material to perform aerobic composting;
the desilting bottom mud, the algae mud and the auxiliary material sawdust are mixed according to the following mass fraction: 4-8 parts of dredging bottom mud, 1-2 parts of algae mud and 1-2 parts of sawdust.
Specifically, the desilting bottom mud is 4 parts, the algae mud is 1 part, and the sawdust is 1 part.
Specifically, the content of organic matters in the algae mud is 45-65 wt%, the water content is 91-94 wt%, the content of organic matters in the dredging bottom mud is 3-7 wt%, and the water content is 45-70 wt%; the content of organic matters in the sawdust is 58 wt%, and the water content is 6 wt%.
Specifically, the algae mud is directly obtained from a microcystis aeruginosa storage yard on a salvage construction site.
Specifically, the dredging bottom mud is directly obtained from a dredging bottom mud storage yard on a bottom mud dredging site.
Specifically, the desilting bottom mud, the algae mud and the auxiliary material sawdust are uniformly mixed and then are fermented in a stack mode.
Specifically, the desilting bottom mud, the algae mud and the auxiliary material sawdust are mixed uniformly and then are loosely placed into a stack, a forced static ventilation system is adopted, and the ventilation rate is 0.6m3/min。
The principle and the advantages are as follows:
aiming at the characteristics of high water content and high organic matter content of the algae sludge, and the characteristics of poor water retention and low organic matter content of the dredging bottom sludge, the invention adopts the mixture of the algae sludge and the dredging bottom sludge as the aerobic compost, is assisted by sawdust auxiliary materials, limits the components of each compost in a specific range, and realizes the synchronous recycling of the algae sludge and the dredging bottom sludge under the synergistic action of the components. Because algae salvage and sediment dredging are usually carried out synchronously in eutrophic water body treatment, the possibility is provided for synchronous resource utilization of the algae salvage and the sediment dredging.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a synchronous recycling method for aerobic composting of algae sludge salvaged by water and desilted bottom sludge, wherein aerobic composting materials are prepared from the following raw materials in percentage by weight:
wherein the salvaged algae mud is algae mud in an algae yard on a construction site, the organic matter content is 45-65%, and the water content is 91-94%; the dredging bottom mud is the dredging bottom mud of a construction site bottom mud storage yard, the content of organic matters is 3-7%, and the water content is 45-70%; the sawdust comes from a wood processing factory, the organic matter content is 58 percent, and the water content is 6 percent.
Example 1 aerobic composting and synchronous reclamation of salvaged algae sludge and desilted bottom sludge
Removing sand, stone and impurities from the desilting bottom mud, and crushing for later use. Weighing 8 parts of bottom mud, 1 part of algae mud and 1 part of sawdust, mixing uniformly, then loosely loading into a stack, and adopting a forced static ventilation system to achieve the ventilation rate of 0.6m 3/min. The stack temperature was measured once a day, and the time to 55 ℃ temperature was recorded, as well as the number of days above 55 ℃ on which the temperature lasted. Sampling the compost at 0d, 10d, 20d and 30d for physical and chemical property analysis.
Example 2 aerobic composting and resource recovery of salvaged algae sludge and desilted bottom sludge
Removing sand, stone and impurities from the desilting bottom mud, and crushing for later use. Weighing 6 parts of bottom mud, 1 part of algae mud and 1 part of sawdust, mixing uniformly, then loosely loading into a stack, and adopting a forced static ventilation system, wherein the ventilation rate is 0.6m 3/min. The stack temperature was measured once a day, and the time to 55 ℃ temperature was recorded, as well as the number of days above 55 ℃ on which the temperature lasted. Sampling the compost at 0d, 10d, 20d and 30d for physical and chemical property analysis.
Example 3 aerobic composting of salvaged algae sludge and desilted bottom sludge synchronous reclamation
Removing sand, stone and impurities from the desilting bottom mud, and crushing for later use. Weighing 4 parts of bottom mud, 1 part of algae mud and 1 part of sawdust, mixing uniformly, then loosely loading into a stack, and adopting a forced static ventilation system, wherein the ventilation rate is 0.6m 3/min. The stack temperature was measured once a day, and the time to 55 ℃ temperature was recorded, as well as the number of days above 55 ℃ on which the temperature lasted. Sampling the compost at 0d, 10d, 20d and 30d for physical and chemical property analysis.
Example 4 aerobic composting of salvaged algae sludge and desilted bottom sludge synchronous reclamation
Removing sand, stone and impurities from the desilting bottom mud, and crushing for later use. Weighing 8 parts of bottom mud, 1 part of algae mud and 2 parts of sawdust, mixing uniformly, then loosely loading into a stack, and adopting a forced static ventilation system, wherein the ventilation rate is 0.6m 3/min. The stack temperature was measured once a day, and the time to 55 ℃ temperature was recorded, as well as the number of days above 55 ℃ on which the temperature lasted. Sampling the compost at 0d, 10d, 20d and 30d for physical and chemical property analysis.
Example 5 aerobic composting of salvaged algae sludge and desilted bottom sludge synchronous reclamation
Removing sand, stone and impurities from the desilting bottom mud, and crushing for later use. Weighing 8 parts of bottom mud, 2 parts of algae mud and 1 part of sawdust, mixing uniformly, then loosely loading into a stack, and adopting a forced static ventilation system, wherein the ventilation rate is 0.6m 3/min. The stack temperature was measured once a day, and the time to 55 ℃ temperature was recorded, as well as the number of days above 55 ℃ on which the temperature lasted. Sampling the compost at 0d, 10d, 20d and 30d for physical and chemical property analysis.
Comparative example 1 aerobic composting and synchronous resource recovery of salvaged algae sludge and desilting bottom sludge
Removing sand, stone and impurities from the desilting bottom mud, and crushing for later use. Weighing 3 parts of bottom mud, 3 parts of algae mud and 0.5 part of sawdust, mixing uniformly, loosely loading into a stack, and adopting a forced static ventilation system with the ventilation rate of 0.6m 3/min. The stack temperature was measured once a day, and the time to 55 ℃ temperature was recorded, as well as the number of days above 55 ℃ on which the temperature lasted. Sampling the compost at 0d, 10d, 20d and 30d for physical and chemical property analysis.
Comparative example 2, synchronous reclamation of aerobic composting of salvaged algae sludge and desilting bottom sludge
Removing sand, stone and impurities from the desilting bottom mud, and crushing for later use. Weighing 10 parts of bottom mud, 0.5 part of algae mud and 1 part of sawdust, mixing uniformly, then loosely putting into a stack, and adopting a forced static ventilation system with the ventilation rate of 0.6m 3/min. The stack temperature was measured once a day, and the time to 55 ℃ temperature was recorded, as well as the number of days above 55 ℃ on which the temperature lasted. Sampling the compost at 0d, 10d, 20d and 30d for physical and chemical property analysis.
The time to 55 ℃ for the stack temperature of examples 1-5 and comparative examples 1-2 was recorded, as well as the number of days above 55 ℃ for the duration of the test, and the results are given in Table 1; physical and chemical properties of the compost obtained in examples 1 to 5 and comparative examples 1 to 2 were measured, and the results are shown in Table 2.
TABLE 1 Effect of temperature increase in various examples
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 | |
| Time for stack temperature to reach 55 DEG C | No. 3d | 2d th | 2d th | No. 3d | No. 3d | 5d th | 5d th |
| Days at 55 deg.C or higher | 9d | 10d | 12d | 9d | 10d | 5d | 2d |
The experimental results shown in table 1 show that: the mixture of the algae mud and the dredging bottom mud is used as a main material, the saw dust is used as an auxiliary material for aerobic composting, the temperature rising speed is high, the temperature can reach more than 55 ℃ within 2-3d, the duration time of the high-temperature stage is long, and the sanitary standard that the high temperature of more than 55 ℃ lasts more than 7d is reached within 9-12 d.
The experimental results shown in table 2 show that: the aerobic composting effect of the algae mud and the dredging bottom mud is good. After 30d aerobic composting, the water content of the sample material is reduced by 21.0-27.9%, the organic matter content is reduced by 3.8-12.6%, and the germination index of the seeds is increased by 49.2-64.3%. The water content of the product after composting is 22.6-29.3%, the content of available phosphorus is 1.2-1.6g/kg, the content of ammonium nitrogen is 5.8-9.2g/kg, and the content of humus is 7.2-10.1 g/kg.
As can be seen from comparative examples 1 and 2, when the desilting bottom mud, the algae mud and the auxiliary material sawdust are not within the range defined in the present application, the aerobic composting recycling effect becomes poor. The reason is that the algae mud adding amount of the comparative example 1 is too much, the water content of the compost is higher, the ventilation effect of the compost is poor, a large amount of heat is taken away by water loss in the composting process, the temperature rise is slow, and the duration time of the high-temperature stage above 55 ℃ cannot reach 7 days required by the sanitary requirement; meanwhile, the germination index of the seeds of the product after 30 days is less than 80 percent, which indicates that the material does not reach the rotten degree. Comparative example 2 because the addition amount of the desilting bottom mud is too much, the organic matter content of the pile body is not enough to maintain the requirement of microbial fermentation in the body, the generated heat is low, the temperature rise is slow, and the high-temperature stage above 55 ℃ can only maintain 2 d; meanwhile, the germination index of the seeds of the product after 30 days is less than 80 percent, which indicates that the material does not reach the rotten degree.
Table 2 results of physicochemical properties of compost from different examples
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (7)
1. A synchronous resource method of algae sludge salvage and dredging bottom sludge aerobic composting in water is characterized in that: aerobic composting is carried out by taking the mixture of the algae mud and the dredging bottom mud as a main material and the sawdust as an auxiliary material;
the desilting bottom mud, the algae mud and the auxiliary material sawdust are mixed according to the following mass fraction: 4-8 parts of dredging bottom mud, 1-2 parts of algae mud and 1-2 parts of sawdust.
2. The method for synchronously recycling the algae sludge and the desilting sediment aerobic composting in the water body according to claim 1, which is characterized in that: 4 parts of dredging bottom mud, 1 part of algae mud and 1 part of sawdust.
3. The synchronous resource method of the aerobic composting of the algae mud salvaged by the water body and the dredging bottom mud as claimed in claim 1 or 2, characterized in that: the organic matter content in the algae mud is 45-65 wt%, the water content is 91-94 wt%, the organic matter content in the dredging bottom mud is 3-7 wt%, and the water content is 45-70 wt%; the content of organic matters in the sawdust is 58 wt%, and the water content is 6 wt%.
4. The method for synchronously recycling the algae sludge fished in the water body and the aerobic composting of the dredging bottom sludge as claimed in claim 3, characterized in that: the algae mud is directly obtained from a microcystis aeruginosa storage yard on a salvage construction site.
5. The method for synchronously recycling the algae sludge and the desilting sediment aerobic composting in the water body according to claim 4, which is characterized in that: the dredging bottom mud is directly obtained from a dredging bottom mud storage yard on a bottom mud dredging site.
6. The method for synchronously recycling the algae sludge and the desilting sediment aerobic composting in the water body according to claim 4, which is characterized in that: uniformly mixing the desilting bottom mud, the algae mud and the auxiliary material sawdust, and then fermenting in a stack manner.
7. The method for synchronously recycling the algae sludge and the desilting sediment aerobic composting in the water body according to claim 6, which is characterized in that: mixing the desilting bottom mud, the algae mud and the auxiliary material sawdust uniformly, then loosely loading the mixture into a stack, adopting a forced static ventilation system, and ensuring the ventilation rate to be 0.6m3/min。
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