CN115365280B - Modified plant ash, modification method and application thereof - Google Patents
Modified plant ash, modification method and application thereof Download PDFInfo
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- CN115365280B CN115365280B CN202211306085.7A CN202211306085A CN115365280B CN 115365280 B CN115365280 B CN 115365280B CN 202211306085 A CN202211306085 A CN 202211306085A CN 115365280 B CN115365280 B CN 115365280B
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- 238000002715 modification method Methods 0.000 title claims abstract description 10
- 239000010802 sludge Substances 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 24
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000018044 dehydration Effects 0.000 claims abstract description 15
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 15
- 239000012024 dehydrating agents Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000007873 sieving Methods 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 abstract description 25
- 230000015271 coagulation Effects 0.000 abstract description 2
- 238000005345 coagulation Methods 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 10
- 235000011941 Tilia x europaea Nutrition 0.000 description 10
- 239000004571 lime Substances 0.000 description 10
- 239000005416 organic matter Substances 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000003337 fertilizer Substances 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Health & Medical Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The application discloses modified plant ash and a modification method and application thereof, belonging to the technical field of sludge conditioning; fully soaking the sieved plant ash in sulfuric acid at room temperature, and stirring for 1-5 h; and after stirring and soaking, drying the plant ash for 1-3 hours to obtain the acid modified plant ash. Adding the prepared modified plant ash into the sludge, uniformly stirring, and continuously stirring the sludge with the organic dehydrating agent; and continuously press-filtering the mixed sludge on a plate-and-frame filter press after stirring to obtain a mud cake. The modified plant ash prepared by the method has the advantages of enhancing the adsorptivity, playing a better role in adsorbing and bridging in the sludge coagulation conditioning, and improving the sludge dewatering efficiency. Meanwhile, the damage to the dehydration equipment is small, and the cost of a series of processes from dehydration to incineration is reduced.
Description
Technical Field
The application relates to the technical field related to sludge conditioning, in particular to modified plant ash, a modification method and application thereof.
Background
The deep dehydration of the sludge is used as a key link of sludge disposal, and the sludge with higher water content is subjected to physical or chemical conditioning, and then the water content is dehydrated to be below 60% in a mechanical dehydration mode, so that the stabilization and the reduction in the sludge disposal are realized. The deep-removed product has a certain heat value, can be used as low-grade fuel of a power plant and clinker in the cement production process, and realizes harmless and recycling in sludge disposal. The sludge conditioning is used as a key link in the deep dehydration process of the sludge, the physicochemical properties of the sludge are changed, the colloidal structure of the sludge is destroyed, and the affinity between the sludge and the water is reduced. The effective conditioning technology can improve the sludge concentration and dehydration performance and improve the mechanical dehydration efficiency.
The sludge conditioning method mainly comprises a physical conditioning method, a chemical conditioning method and a biological conditioning method, wherein the common conditioning methods at present are chemical conditioning methods, including pure inorganic, inorganic and inorganic combinations and inorganic and organic combinations, and most of inorganic conditioning agents mainly comprise lime, ferric salt, aluminum salt and the like, and the inorganic conditioning methods have the problems of pollution to site environment, equipment loss, secondary pollution for subsequent treatment of produced mud cakes and the like. Along with the trend of environmental protection policy, the requirements on environmental protection and sludge recycling are further enhanced, and the deep dehydration mode of sludge by adopting inorganic conditioning agents such as lime, ferric salt, aluminum salt and the like is more and more rejected by industry.
The plant ash is used as biomass waste, the treatment mode of the plant ash is mainly landfill or waste at present, and the effective utilization mode of the plant ash is only directly used as a natural potash fertilizer for directly using the plant ash in soil or a sterilizing and insect-preventing fertilizer because the plant ash contains more potassium elements. The plant ash is light in weight and alkaline, so that the environmental pollution to air, water and soil in the treatment process is also a problem to be solved urgently.
Therefore, there is a need for a modified plant ash which reduces alkalinity, does not pollute the environment, and can be used for sludge dewatering.
Disclosure of Invention
The application aims at solving the problems and provides modified plant ash, a modification method and application thereof.
A method for modifying plant ash, comprising the following steps:
step I, drying plant ash, and sieving the dried plant ash;
step II, fully soaking the sieved plant ash in sulfuric acid at room temperature, and stirring for 1-5 h;
and III, after stirring and soaking are finished, drying the plant ash for 1-3 hours to obtain the acid modified plant ash.
Preferably or alternatively, the drying temperature in the step I is 80-120 ℃.
Preferably or alternatively, the plant ash number after sieving in the step II is 60-120 meshes.
Preferably or alternatively, the stirring frequency in the step II is 30-100 rpm.
Preferably or alternatively, the mass ratio of the sulfuric acid to the plant ash in the step II is 0.002-0.006.
Preferably or alternatively, in the step II, the molar concentration of sulfuric acid is 3-5 mol/L.
A modified plant ash produced according to the plant ash modification method of any one of the above.
The modified plant ash prepared by the modification method of the plant ash is used for preparing a sludge conditioner and comprises the following steps:
adding the modified plant ash into the sludge, uniformly stirring, and continuously stirring the sludge with the organic dehydrating agent; and after stirring, continuously press-filtering the mixed sludge on a plate-and-frame filter press to obtain a mud cake, wherein the continuous press-filtering is specifically to press-filter the mud cake for 0.1-1.5 h under 0.2-0.6 mpa, press-filter the mud cake for 0.1-1.5 h under 0.8-1.2 mpa and press-filter the mud cake for 20min under 1.5-2.5 mpa.
The beneficial effects are that: the application provides a modified plant ash and a modification method and application thereof, wherein the plant ash is modified by sulfuric acid, the surface of the plant ash is corroded by sulfuric acid, and simultaneously, reactive groups such as carboxyl, hydroxyl and the like are introduced into the surface of the plant ash, so that the surface area of the plant ash is increased, the adsorptivity of the plant ash is improved, the effect of better adsorbing and bridging in the coagulation and conditioning of sludge is achieved, the density of hydrophobic pipelines between sludge is improved, the sludge has higher dewatering effect on a macroscopic scale, and the sludge dewatering efficiency is improved. Meanwhile, the modified plant ash has no corrosiveness, is not easy to scale under neutral pH, has less damage to dehydration equipment, has longer service life compared with the rest of alkaline conditioner, and effectively reduces the generation of harmful gases such as dioxin in the incineration treatment process in the subsequent incineration treatment link of sludge. The cost of a series of processes from dehydration to incineration is reduced.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the application may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the application.
The application is further illustrated below in conjunction with examples, examples of which are intended to illustrate the application and are not to be construed as limiting the application. The specific techniques and reaction conditions not specified in the examples may be carried out according to the techniques or conditions described in the literature in this field or the product specifications. Reagents, instruments or equipment not specifically mentioned in the manufacturer are commercially available.
Example 1
Laboratory bench test results were used as example 1.
The method for modifying the plant ash by acid comprises the following steps: drying plant ash at 105 ℃, sieving the dried plant ash by a 120-mesh sieve, soaking the plant ash in 4mol/L sulfuric acid for 2 hours at room temperature, and stirring at a speed of 40r/min in the soaking process, wherein the ratio of the sulfuric acid to the plant ash is 3mg/g; drying the modified plant ash for 2 hours at 105 ℃; taking the dried plant ash as a conditioner.
The deep dehydration process based on acid modified plant ash as a conditioner comprises the following steps of taking sludge in a concentration tank of a municipal sewage treatment plant in the south, wherein the water content of the sludge is 97.4%, and the organic matter content is 60%; weighing 500g of sludge, adding acid modified plant ash, and stirring at a speed of 250r/min by using an IKA stirrer for 5min; adding the organic dehydrating agent with the concentration of 5% into the sludge which is uniformly mixed with the modified plant ash, and continuously stirring at the speed of 250r/min for 5min; independently customizing mixed and conditioned sludge in laboratory by using small plate-and-frame filter pressCarrying out filter pressing on the mixture; simulating a field low-pressure and high-pressure feeding mode, performing filter pressing for 20min under the pressure of 0.4Mpa, performing filter pressing for 10min under the pressure of 1.0Mpa, and performing press pressing for 20min under the pressure of 2.0 Mpa; after the press filtration process is finished, taking out mud cakes to test the relative indexes of the water content and the pH value of the filtrate; comparative "FeCl 3 And (3) adjusting the dosage proportion of the plant ash and the organic dehydrating agent by using the conditioning process of +lime', and repeating the experimental process to obtain related experimental data and related conclusions. Table 1 shows the results of the laboratory tests:
TABLE 1
As can be seen from Table 1, under the adjustment scheme of plant ash or modified plant ash and organic dehydrating agent, the water content of the mud cake can reach FeCl 3 The pH of the effluent is close to neutral with the level under the lime conditioning scheme; under the condition that the addition amount of the modified plant ash is equal to that of the plant ash, the mud discharging effect of the modified plant ash and the organic dehydrating agent is better. In the embodiment, the sludge produced in the conditioning mode mainly comprising plant ash has high organic matter content, high heat value and increased potassium element content, and is beneficial to the recycling treatment of the sludge.
Experimental example 2:
the results of the field simulation test were taken as example 2.
Sludge of a municipal sewage treatment plant in the south has 97% of water content and 58% of organic matter content, and the deep dehydration process of the sludge is conditioned by adopting a combination mode of FeCl3+lime, and FeCl in ton of absolute dry sludge 3 The addition amount of the lime is 5%, the addition amount of the lime is 30%, and the filtering area of the plate-and-frame filter press is 200m 3 Feeding at low and high pressure for 100min, pressing at 2.0Mpa for 30min, treating filtrate effluent again for reuse, wherein the water content of the effluent mud is about 55%, crushing the effluent mud on site, and carrying out outward burning; the plant ash for the test comes from a local straw power plant, the water content of the plant ash is 27.66%, the site sludge conditioning pool 1 seat is divided into A, B grids, the plane size is 12.8m, the height is 5.9m, and the plant ash is independently operated; throwing into a conditioning pond with A seat for 40m 3 Is a sludge, poolAdding plant ash while stirring, adding about 500kg in total, and stirring for 30min after the addition; while plant ash and sludge are stirred and mixed, 1m of the mixture is added into a self-made dissolving tank 3 Adding 40kg of organic dehydrating agent into the recycled water, stirring and dissolving, adding the dissolved organic dehydrating agent into a conditioning tank after the mixing time of plant ash and sludge is up, stirring for 10min again, starting feeding, and taking mud cakes to test relevant indexes such as water content, organic matter content, heat value and the like after the feeding process and the filter pressing process are finished; adjusting the dosing proportion of plant ash and the organic dehydrating agent, and repeating the test process to obtain relevant test data; and comparing and analyzing the test data obtained under the conditioning process of the plant ash and the organic dehydrating agent with the data known under the conditioning process of the field FeCl3+lime to obtain a conclusion. Table 2 shows the results of the in-situ test.
TABLE 2
As is clear from Table 2, the dehydration efficiency and the dehydration effect can be improved at the same time by properly increasing the contents of plant ash and the dehydrating agent.
Example 3
Table 3 below shows the results of the tests performed on the organic matter content, the calorific value and the ph of the obtained mud cake.
TABLE 3 Table 3
From the above table data, the conclusion is drawn: compared with FeCl under the conditioning process of plant ash and organic dehydrating agent through debugging 3 The mud cake produced by the +lime process is improved in the aspects of organic matter content, heat value and pH value; the mud feeding time is shortened, and the production effect is improved; when the mud cake is transported and burned for disposal, the raw materials required by the generation of dioxin can be reduced; when the fertilizer is used for composting, the fertilizer efficiency of organic fertilizer products is improved by the nutrient components such as potassium in the sludge; near the plant ash production site, transportation andthe running cost is reduced; the comprehensive cost of corrosion of equipment, scaling of pipelines, treatment of sludge and the like is reduced; compared with ferric salt and lime, the method has certain limitation in reducing the water content, but can meet the requirement that the water content in sludge treatment is lower than 60 percent.
Claims (5)
1. The sludge deep dehydration process based on the modified plant ash is characterized by comprising the following steps of: adding the modified plant ash into the sludge, uniformly stirring, and then adding an organic dehydrating agent into the sludge for continuous stirring; continuously press-filtering the mixed sludge on a plate-and-frame filter press after stirring is finished to obtain a mud cake, wherein the continuous press-filtering is specifically to press-filter the sludge under 0.2-0.6 mpa for 0.1-1.5 h, press-filter the sludge under 0.8-1.2 mpa for 0.1-1.5 h and press-filter the sludge under 1.5-2.5 mpa for 20min;
the modification method of the modified plant ash comprises the following steps:
step I, drying plant ash, and sieving the dried plant ash;
step II, fully soaking the sieved plant ash in sulfuric acid at room temperature, and stirring for 1-5 h, wherein the mass ratio of the sulfuric acid to the plant ash is 0.002-0.006;
and III, after stirring and soaking are finished, drying the plant ash for 1-3 hours to obtain the acid modified plant ash.
2. The modification method of modified plant ash according to claim 1, wherein the drying temperature in the step i is 80-120 ℃.
3. The method for modifying plant ash according to claim 1, wherein the plant ash obtained by sieving in the step ii has a mesh number of 60 to 120 mesh.
4. The method for modifying plant ash according to claim 1, wherein the stirring frequency in the step ii is 30 to 100 rpm.
5. The method for modifying plant ash according to claim 1, wherein in the step ii, the molar concentration of sulfuric acid is 3 to 5mol/L.
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|---|---|---|---|---|
| CN102874979A (en) * | 2012-09-24 | 2013-01-16 | 广西大学 | Method for treating sewage of livestock and poultry farm by using modified coal ash |
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| CN102874979A (en) * | 2012-09-24 | 2013-01-16 | 广西大学 | Method for treating sewage of livestock and poultry farm by using modified coal ash |
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