CN116375403A - Preparation method of renewable ceramic filler and application of renewable ceramic filler in sewage treatment - Google Patents
Preparation method of renewable ceramic filler and application of renewable ceramic filler in sewage treatment Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 59
- 239000000945 filler Substances 0.000 title claims abstract description 44
- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000011282 treatment Methods 0.000 title claims description 27
- 229920001661 Chitosan Polymers 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000004088 foaming agent Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000002243 precursor Substances 0.000 claims abstract description 20
- 239000000853 adhesive Substances 0.000 claims abstract description 18
- 230000001070 adhesive effect Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000010802 sludge Substances 0.000 claims abstract description 14
- XUJNEKJLAYXESH-UHFFFAOYSA-N cysteine Natural products SCC(N)C(O)=O XUJNEKJLAYXESH-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000018417 cysteine Nutrition 0.000 claims abstract description 9
- 238000000498 ball milling Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 5
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims abstract description 5
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 5
- 239000008103 glucose Substances 0.000 claims abstract description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229940099259 vaseline Drugs 0.000 claims abstract description 5
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 19
- 239000002351 wastewater Substances 0.000 claims description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 claims description 2
- 230000004060 metabolic process Effects 0.000 abstract description 4
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002245 particle Substances 0.000 description 8
- 239000011148 porous material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 230000006196 deacetylation Effects 0.000 description 1
- 238000003381 deacetylation reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/10—Carbohydrates or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Molecular Biology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Biological Treatment Of Waste Water (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a preparation method of a renewable ceramic filler, which comprises the following steps: s1, mixing river bottom mud and domestic sludge with a foaming agent, an adhesive and water, baking, cooling, crushing and sieving to obtain coarse materials; s2, ball-milling and granulating the coarse material to obtain a precursor; s3, heating the precursor in a gradient way until the temperature reaches 100-120 ℃, keeping the constant temperature, and cooling to obtain a product; wherein the adhesive adopts components including modified chitosan, vaseline, glucose, kaolin and water; the modified chitosan is a product obtained by reacting chitosan with cysteine. The base materials adopted by the invention are common soil and sludge, and are matched with special adhesives and foaming agents, so that a porous ceramic filler structure with ideal appearance can be formed after heat treatment, and the attachment, metabolism and regeneration of flora are facilitated, so that the waste in sewage can be treated efficiently and continuously.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a preparation method of a renewable ceramic filler and application of the renewable ceramic filler in sewage treatment.
Background
Along with the rapid development of industry, industrial wastewater is one of industries with serious ecological environmental pollution, the wastewater has the characteristics of large discharge amount, complex components, high concentration and the like, about 20 percent of raw materials, chemical agents and other impurities in the wastewater exist in the wastewater, the biodegradability (B/C) is low, the treatment difficulty is high, so that SS and COD in the water are much higher than those of common wastewater, and meanwhile, the chromaticity is serious. Aiming at the technical scheme of adsorbing harmful substances in wastewater, the prior art mainly adopts a method of physically adsorbing heavy metal ions, greasy dirt and the like in the wastewater by solid particulate matters with larger specific surface areas such as ceramic fillers and performing biological treatments such as metabolism and the like on the solid particulate matters by microorganism groups growing in various pores of the ceramic fillers to purify the wastewater.
At present, the common materials of the ceramic filler are corundum sand, silicon carbide and other substances, and are matched with components such as an adhesive, a foaming agent and the like, and the ceramic filler is obtained through heating, crushing and granulating, so that the ceramic filler with more pores, large specific surface area and stable performance is expected to be obtained, and a relatively stable propagation and metabolism environment can be obtained in the ceramic filler by microorganisms, so that the sewage treatment effect is improved. However, the pore size and the pore size of the ceramic filler are closely related to the use of the binder and the foaming agent, and if a proper foaming agent and a proper foaming agent are not found, the pore size of the finally formed ceramic filler is small and large, so that the number of bacterial groups is influenced, and the impact resistance is poor.
The application of porous ceramic fillers in the field of sewage treatment is described in the patents of the prior art CN104072090A, CN108726623A and CN109231960A, and the like, however, comparison of sewage treatment effects under turbulent flow is rarely achieved. It is expected that the increase in the water flow rate, and thus the treatment time, tends to affect the sewage treatment effect of the ceramic filler due to the loss of the bacterial flora.
In view of the foregoing, there is a need to develop a new solution for preparing renewable ceramic fillers that can solve the above-mentioned drawbacks.
Disclosure of Invention
Based on the above, the invention develops a preparation method of the renewable ceramic filler, wherein the adopted base materials are common soil and sludge, and the base materials are matched with a special adhesive and a foaming agent, so that a porous ceramic filler structure with ideal appearance can be formed after heat treatment, and the attachment, metabolism and regeneration of flora are facilitated, so that the waste in sewage can be treated efficiently and continuously.
An object of the present invention is to provide a method for producing a renewable ceramic filler, comprising the steps of:
s1, mixing river bottom mud and domestic sludge with a foaming agent, an adhesive and water, baking, cooling, crushing and sieving to obtain coarse materials;
s2, ball-milling and granulating the coarse material to obtain a precursor;
s3, heating the precursor in a gradient way until the temperature reaches 100-120 ℃, keeping the constant temperature, and cooling to obtain a product;
wherein the adhesive adopts components including modified chitosan, vaseline, glucose, kaolin and water;
the modified chitosan is a product obtained by reacting chitosan with cysteine.
Further, the foaming agent is selected from calcium carbonate.
Further, the preparation method of the modified chitosan comprises the following steps:
l1, dissolving chitosan in an aqueous solution of acetic acid to form a solution;
l2, heating the solution, gradually adding cysteine, reacting 6-10 h, removing the solvent and the residual raw materials, and drying to obtain the modified chitosan.
Further, in step S3, the gradient heating method is as follows: heating the precursor to 60-80 ℃ and keeping the temperature constant at 1-2 h; then heating to 100-120 deg.C, and keeping the temperature at 1-2 h deg.C.
Further, in step S1, the mass parts of the river sediment and the domestic sludge are as follows: 40-50 parts of river bottom mud and 50-60 parts of domestic sludge.
Further, in the step S1, the foaming agent is 3-5 wt% of coarse materials; the binder is 3-5 wt% of the coarse material.
Further, in the step S1, the modified chitosan is 50-70 wt% of the foaming agent.
The invention also aims to provide the application of the renewable ceramic prepared by the preparation method of the renewable ceramic filler in sewage treatment.
Further, the application of the renewable ceramic prepared by the preparation method of the renewable ceramic filler in sewage treatment comprises the following steps:
c1, regulating the pH value of the wastewater to 6-9, and regulating the temperature to 15-35 ℃;
c2, putting the renewable ceramics into the reactor, and carrying out aerobic or anaerobic treatment for 7-10 days;
and C3, testing the index of the wastewater.
Further, the renewable ceramic is 10-30 wt% of sewage.
The invention has the following beneficial effects:
the invention discloses a preparation method of renewable ceramic filler, wherein the adhesive adopts a composition comprising modified chitosan, and the modified chitosan is a product obtained by reacting chitosan with cysteine. On one hand, the obtained modified chitosan contains amino and sulfhydryl groups, and the strong polar groups can better adsorb the foaming agent calcium carbonate particles, so that the foaming agent calcium carbonate particles are adsorbed on the adhesive relatively stably; on the other hand, chitosan itself is a high polymer structure which is easy to form a three-dimensional network structure in a substrate, so that a foaming agent can be dispersed to various parts of the substrate along with a polymer chain segment, thereby forming uniform, compact and small-particle-size pores in the foaming process.
The other components in the adhesive, glucose and kaolin, can assist the binding effect of the adhesive and the effect of dispersing the solid particles, while the vaseline has strong adhesion.
Description of the embodiments
In order to more clearly illustrate the technical solution of the present invention, the following examples are set forth. The starting materials, reactions and workup procedures used in the examples are those commonly practiced in the market and known to those skilled in the art unless otherwise indicated.
The words "preferred," "more preferred," and the like in the present disclosure refer to embodiments of the present disclosure that may provide certain benefits in some instances. However, other embodiments may be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
It should be understood that, except in any operating examples, or where otherwise indicated, quantities or all numbers expressing, for example, quantities of ingredients used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that may vary depending upon the desired properties to be obtained by the present invention.
The chitosan in the embodiment of the invention is purchased from Qingdao Hongsha biotechnology Co., ltd, and has the molecular weight of 100 kDa, the deacetylation degree of 91.0% and the viscosity of 45 mPa.s.
The river bottom mud is collected from Guangzhou river sections of Zhujiang (collection region: near subway entrance of Zhujiang newcastle);
the domestic sludge is collected from Guangzhou municipal sewage treatment Limited liability company;
the particle size of the calcium carbonate is 0.02 mu m;
the rest reagents are all common substances on the market.
The parts are all parts by weight.
The adhesive comprises the following components: 60 parts of modified chitosan, 5 parts of Vaseline, 5 parts of glucose, 20 parts of kaolin and 20 parts of water.
The modified chitosan is a product obtained by reacting chitosan with cysteine. The method comprises the following specific steps:
l1, dissolving chitosan in a sufficient amount of 15 wt% acetic acid aqueous solution to form a solution;
l2, heating the solution to 50 ℃, then gradually adding cysteine (the cysteine is excessive relative to chitosan), stirring for reaction 6 h, then removing the solvent and the residual raw materials, and drying to obtain the modified chitosan.
Example 1:
a method for preparing a renewable ceramic filler comprising the steps of:
s1, mixing 50 parts of river bottom mud and 50 parts of domestic sludge with 7 parts of foaming agent, 10 parts of adhesive and 30 parts of water uniformly, baking at 110 ℃ until the mixture becomes hard, cooling, crushing by a crushing device and sieving by a 100-mesh sieve to obtain coarse material;
s2, ball milling and granulating the coarse material into spheres with the particle size of 7 mm by using a ball mill to obtain a precursor;
s3, heating the precursor in a two-stage gradient manner, and firstly, heating the precursor to 60 ℃ from normal temperature at a speed of 3 ℃/min and keeping the temperature constant at 1 h; then the temperature is increased to 100 ℃ at the speed of 3 ℃/min, the constant temperature is 1 h, and then the product is obtained after cooling.
Example 2:
a method for preparing a renewable ceramic filler comprising the steps of:
s1, uniformly mixing 45 parts of river bottom mud and 55 parts of domestic sludge, 8 parts of foaming agent, 12 parts of adhesive and 35 parts of water, baking at 115 ℃ until the mixture becomes hard, cooling, crushing by a crushing device and sieving by a 100-mesh sieve to obtain coarse material;
s2, ball milling and granulating the coarse material into spheres with the particle size of 7 mm by using a ball mill to obtain a precursor;
s3, heating the precursor in a two-stage gradient manner, and firstly, heating the precursor to 70 ℃ from normal temperature at a speed of 4 ℃/min and keeping the temperature constant for 2 h; then the temperature is increased to 120 ℃ at the speed of 4 ℃/min, the constant temperature is 2 h, and then the product is obtained after cooling.
Example 3:
a method for preparing a renewable ceramic filler comprising the steps of:
s1, uniformly mixing 47 parts of river bottom mud and 60 parts of domestic sludge with 10 parts of foaming agent, 15 parts of adhesive and 47 parts of water, baking at 105 ℃ until the mixture becomes hard, cooling, crushing by a crushing device and sieving by a 100-mesh sieve to obtain coarse material;
s2, ball milling and granulating the coarse material into spheres with the particle size of 7 mm by using a ball mill to obtain a precursor;
s3, heating the precursor in a two-stage gradient manner, and firstly, heating the precursor to 75 ℃ from normal temperature at a speed of 4 ℃/min and keeping the temperature constant at 2 h; then the temperature is increased to 110 ℃ at the speed of 4 ℃/min, the constant temperature is 1 h, and then the product is obtained after cooling.
Example 4:
a method for preparing a renewable ceramic filler comprising the steps of:
s1, uniformly mixing 45 parts of river bottom mud and 62 parts of domestic sludge, 11 parts of foaming agent, 17 parts of adhesive and 55 parts of water, baking at 108 ℃ until the mixture becomes hard, cooling, crushing by a crushing device and sieving by a 100-mesh sieve to obtain coarse materials;
s2, ball milling and granulating the coarse material into spheres with the particle size of 8 mm by using a ball mill to obtain a precursor;
s3, heating the precursor in a two-stage gradient manner, and firstly, heating the precursor to 80 ℃ from normal temperature at a speed of 3 ℃/min and keeping the temperature at 1.5 h; then the temperature is increased to 115 ℃ at the speed of 4 ℃/min, the constant temperature is 1.5 h, and then the product is obtained after cooling.
Comparative example 1
The preparation method of the renewable ceramic filler of comparative example 1 is the same as that of example 1, except that the modified chitosan is not used in comparative example 1, but the chitosan with equal mass fraction is directly used instead.
Comparative example 2
The comparative example 2 was prepared by the same method as in example 1 except that calcium carbonate was not used in comparative example 2, but sodium silicate was directly used instead of the same amount of sodium silicate.
Test example 1
The renewable ceramic fillers obtained in examples 1-2 and comparative examples 1-2 were used in sewage treatment experiments. The sewage is taken from the water body of the aerobic section and the anaerobic section of the Guangzhou municipal sewage treatment limited responsibility company, and is mixed according to the volume ratio of 1:1, and the obtained water body is enough to complete the test case.
The test steps are as follows:
c1, subpackaging the wastewater to be tested into a plurality of pools (volume is 10 m < 3 >) which are built by reinforced cement with the same volume, adjusting the pH of the wastewater to be tested to 7.5, adjusting the temperature to 25+/-1 ℃, and setting a stirrer on the wastewater to continuously stir the wastewater in the pools (rotating speed is 30 r/min), so that turbulent environment is caused;
c2, aerobic treatment: putting the renewable ceramics obtained in the examples 1-2 and the comparative examples 1-2 into the bottoms of four different pools (the renewable ceramics is 20 wt% of sewage) respectively, aerating for 7 days, and ensuring that the oxygen content in the sewage is 3-5 mg/L;
c2', anaerobic treatment: putting the renewable ceramics obtained in the embodiment 1-2 and the comparative example 1-2 into the bottoms of the four different pools d (the renewable ceramics is 20 wt% of sewage), sealing the tops of the pools by using plastic cloth, performing anaerobic treatment for 7 days, and ensuring that the oxygen content in the sewage is 0.2 mg/L;
and C3, testing the index of the wastewater after the renewable ceramic treatment, and comparing with the index before the treatment.
The results obtained are shown in Table 1.
TABLE 1 comparison of SS and COD indicators before and after wastewater treatment
As can be seen from Table 1, the examples have significant advantages over the comparative examples, both after aerobic and anaerobic treatment, mainly because the renewable ceramic filler formed in the examples has a desirable morphology, and is thus more suitable for stable and healthy survival of microbial flora, and can be relatively firmly attached to ceramic pores even in turbulent environments, thereby efficiently treating SS and COD in wastewater.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A method for preparing a renewable ceramic filler, characterized in that the method for preparing the renewable ceramic filler comprises the following steps:
s1, mixing river bottom mud and domestic sludge with a foaming agent, an adhesive and water, baking, cooling, crushing and sieving to obtain coarse materials;
s2, ball-milling and granulating the coarse material to obtain a precursor;
s3, heating the precursor in a gradient way until the temperature reaches 100-120 ℃, keeping the constant temperature, and cooling to obtain a product;
wherein the adhesive adopts components including modified chitosan, vaseline, glucose, kaolin and water;
the modified chitosan is a product obtained by reacting chitosan with cysteine.
2. The method of preparing a renewable ceramic filler according to claim 1, wherein the foaming agent is selected from the group consisting of calcium carbonate.
3. The method for preparing the renewable ceramic filler according to claim 1, wherein the method for preparing the modified chitosan comprises the following steps:
l1, dissolving chitosan in an aqueous solution of acetic acid to form a solution;
l2, heating the solution, gradually adding cysteine, reacting 6-10 h, removing the solvent and the residual raw materials, and drying to obtain the modified chitosan.
4. The method for producing a renewable ceramic filler according to claim 1, wherein in step S3, the gradient heating method is: heating the precursor to 60-80 ℃ and keeping the temperature constant at 1-2 h; then heating to 100-120 deg.C, and keeping the temperature at 1-2 h deg.C.
5. The method for preparing the renewable ceramic filler according to claim 1, wherein in the step S1, the mass parts of the river sediment and the domestic sludge are as follows: 40-50 parts of river bottom mud and 50-60 parts of domestic sludge.
6. The method for producing a renewable ceramic filler according to claim 1, wherein in step S1, the foaming agent is 3 to 10 wt% of coarse material; the binder is 3-10 wt% of the coarse material.
7. The method for producing a renewable ceramic filler according to claim 1, wherein in step S1, the modified chitosan is 50 to 70% wt% of the foaming agent.
8. Use of a renewable ceramic prepared by the method for preparing a renewable ceramic filler according to any one of claims 1 to 7 in wastewater treatment.
9. The use of the renewable ceramics prepared by the preparation method of the renewable ceramic filler in sewage treatment according to claim 8, wherein the use of the renewable ceramics prepared by the preparation method of the renewable ceramic filler in sewage treatment comprises the following steps:
c1, regulating the pH value of the wastewater to 6-9, and regulating the temperature to 15-35 ℃;
c2, putting the renewable ceramics into the reactor, and carrying out aerobic or anaerobic treatment for 7-10 days;
and C3, testing the index of the wastewater.
10. The use of the renewable ceramic filler prepared by the method according to claim 9 in sewage treatment, wherein the renewable ceramic is 10-30 wt% of sewage.
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| CN117088639A (en) * | 2023-09-04 | 2023-11-21 | 广东绿韶环保工程有限公司 | Preparation method and application of ceramic filler for sewage treatment |
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