CN112174492A - Composite sludge conditioner - Google Patents
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- 239000010802 sludge Substances 0.000 title claims abstract description 160
- 239000002131 composite material Substances 0.000 title claims abstract description 56
- 230000003750 conditioning effect Effects 0.000 claims abstract description 12
- 239000003093 cationic surfactant Substances 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 26
- 229920000642 polymer Polymers 0.000 claims description 21
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- PGQAXGHQYGXVDC-UHFFFAOYSA-N dodecyl(dimethyl)azanium;chloride Chemical compound Cl.CCCCCCCCCCCCN(C)C PGQAXGHQYGXVDC-UHFFFAOYSA-N 0.000 claims description 9
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 9
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 9
- 229920000858 Cyclodextrin Polymers 0.000 claims description 8
- 239000001116 FEMA 4028 Substances 0.000 claims description 8
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 claims description 8
- 235000011175 beta-cyclodextrine Nutrition 0.000 claims description 8
- 229960004853 betadex Drugs 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical group [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- YYROPELSRYBVMQ-UHFFFAOYSA-N 4-toluenesulfonyl chloride Chemical compound CC1=CC=C(S(Cl)(=O)=O)C=C1 YYROPELSRYBVMQ-UHFFFAOYSA-N 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- 239000010883 coal ash Substances 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 abstract description 48
- 238000006297 dehydration reaction Methods 0.000 abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 38
- 238000003825 pressing Methods 0.000 abstract description 24
- 238000003756 stirring Methods 0.000 description 14
- 238000001035 drying Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 238000007599 discharging Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 239000010865 sewage Substances 0.000 description 7
- 239000010881 fly ash Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
Abstract
The invention belongs to the technical field of sludge conditioning and dewatering. The invention provides a composite sludge conditioner which is prepared from the following raw materials in percentage by weight: 15-25% of an inorganic polymeric flocculant, 5-15% of an organic flocculant, 10-20% of a cationic surfactant, 10-20% of a regulator and 20-55% of a sludge conditioning and loosening agent. The composite sludge conditioner has high dehydration efficiency and low dosage, the addition amount is only 10 percent of the absolute dry weight of the sludge, and the water content of the sludge with the water content of 98 percent can be reduced to below 50 percent after filter pressing dehydration.
Description
Technical Field
The invention belongs to the technical field of sludge conditioning and dewatering, and particularly relates to a composite sludge conditioner for sludge dewatering.
Background
With the increase of population and the development of industrial production, the discharge amount of domestic sewage and industrial sewage is increased day by day, and the output of sludge serving as a final product of sewage treatment is also greatly increased. The sludge has complex components, is a mixed aggregate which takes suspended matters, microorganisms and adsorbed organic matters in the sewage as main bodies and simultaneously mixes various complex components such as colloids, metal salts and the like in the sewage. The sludge not only has complex components, but also has the characteristics of high water content, high organic matter content, strong hydrophilicity, high dehydration difficulty, serious pollution and the like. The estimated current sludge output of the municipal sewage treatment plant in China is over 3000 million tons/year. When the sludge is discharged from the secondary sedimentation tank, the water content is 97-99%, after concentration, the water content of the sludge can be reduced to 94-96%, and the volume of the sludge can be reduced to about 1/4. However, the sludge still has fluidity and large volume, which causes difficulty in subsequent transportation, and heavy metals, humus, pathogenic bacteria and the like contained in the sludge are easily subjected to anaerobic oxidation and smells when being stacked, thereby causing secondary pollution to the environment. Deep dewatering of sludge is required to reduce the volume of sludge, reduce transportation costs, and the like.
The sludge treatment technology has been developed for nearly 100 years, and the treatment and disposal of the sludge are aimed at realizing reduction, stabilization, harmlessness and recycling. At present, the sludge is dewatered to the water content of about 60 percent or even lower by centrifugal dewatering after tempering generally at home and abroad. Sludge conditioning plays a key role in the sludge dewatering process. Through conditioning, the sludge property is improved, and the sludge concentration and dehydration efficiency can be improved. At present, the most widely applied method for sludge dewatering reduction at home and abroad is pretreatment by using a sludge conditioner, and then auxiliary mechanical dewatering and other effective methods for treatment. Therefore, in recent years, sludge conditioners have become a research hotspot in the field of sewage treatment. The chemical regulation method of sludge is characterized by that it utilizes the chemical reaction of chemical agent and surface of colloidal sludge particles to neutralize the charge of sludge granules so as to promote the sludge particles to coagulate into large granular floc and at the same time separate water from sludge granules.
The chemical composition of the sludge is the key to determine the dehydration performance of the sludge, wherein the microorganism and Extracellular Polymer (EPS) organic matter account for 50-70% of the total amount of the sludge, and the distribution and the composition of the sludge have the most obvious influence on the dehydration performance of the sludge. EPS is organic matter produced by microbial secretion, such as polysaccharide, protein, nucleic acid and other polymers, combines most of water in sludge through hydrogen bonds, adsorption and other modes, forms a huge network structure with microorganisms, and further hinders flocculation, filtration and dehydration of the sludge. Meanwhile, due to the influence of factors such as surface charge and the like, solid particles in the sludge and a hydration layer wrapped on the surface form stable colloidal suspension, and the difficulty of sludge dehydration is increased to a great extent. The existing chemical sludge conditioner is developed by adopting single component for conditioning according to the principle and method of preparing flocculation medicament for water treatment, but the single component sludge conditioner cannot achieve ideal dehydration effect. In order to further reduce the water content of the sludge, researchers at home and abroad begin to research and develop a compound conditioner so as to improve the dehydration performance of the sludge and reduce the influence on the environment.
Disclosure of Invention
In view of the above, the invention aims to provide a composite sludge conditioner which has little environmental pollution and can dewater efficiently.
The technical scheme of the invention is as follows:
the composite sludge conditioner consists of the following raw materials in percentage by weight: 15-25% of an inorganic polymeric flocculant, 5-15% of an organic flocculant, 10-20% of a cationic surfactant, 10-20% of a regulator and 20-55% of a sludge conditioning and loosening agent.
Further preferably, the composite sludge conditioner consists of the following raw materials in percentage by weight: 10% of inorganic polymeric flocculant, 10% of organic flocculant, 15% of cationic surfactant, 15% of regulator and 50% of sludge conditioning and loosening agent.
Wherein, the inorganic polymeric flocculant is polyaluminium chloride or/and polyferric sulfate.
Wherein the organic flocculant is a beta-cyclodextrin-polyacrylamide polymer.
Wherein the cationic surfactant is cetyl trimethyl ammonium bromide or dodecyl dimethyl ammonium chloride.
Wherein the regulator is sodium carbonate or/and sodium bicarbonate.
Wherein the sludge conditioning and loosening agent is lime, coal ash or diatomite.
The invention has the beneficial effects that:
the composite sludge conditioner of the invention is prepared by compounding inorganic and organic conditioners, so that the inorganic and organic conditioners have synergistic effect, the aim of remarkably improving the sludge dewatering performance is achieved, and the dewatering performance is far higher than that of a single conditioner. The composite sludge conditioner has the following advantages:
(1) the organic flocculant in the composite sludge conditioner adopts beta-cyclodextrin-polyacrylamide polymer instead of traditional polyacrylamide. The traditional polyacrylamide monomer has toxicity, can pollute the environment and also causes the problem of 'three causes'. The beta-cyclodextrin-polyacrylamide polymer has stable molecular chain, strong anti-shearing capability, compact structure and difficult crushing of floc, and can reduce the toxicity of polyacrylamide and reduce the pollution risk. And compared with the traditional polyacrylamide, the adsorption rate is also greatly improved.
(2) The cationic surfactant is adopted, and the cationic surfactant, the organic flocculant and the inorganic flocculant are synergistic to promote coagulation, so that the dosage of the flocculant can be reduced, and the pollution is further reduced.
(3) The reticular skeleton structure built by the sludge loosening conditioner in the composite sludge conditioner is matched with the flocculating agent for use, so that the content of bound water is reduced, the reticular skeleton structure acts with sludge particles to form a rigid crystal structure with certain strength, the flocculation degree is enhanced, the porosity of the sludge is kept in the compression process, and the water osmotic pressure is improved.
(4) The invention combines the characteristics of excess sludge, adds the inorganic regulator, can effectively reduce the dosage of the polymeric flocculant and reduces the production cost.
(5) The composite sludge conditioner has the advantages of environment-friendly components and simple preparation process.
(6) The composite sludge conditioner has high dehydration efficiency and low dosage, the addition amount is only 10 percent of the absolute dry weight of the sludge, and the water content of the sludge with the water content of 98 percent can be reduced to below 50 percent after filter pressing dehydration.
Detailed Description
For a further understanding of the present invention, reference will now be made to the preferred embodiments of the present invention by way of examples, but it is to be understood that these descriptions are intended only to further illustrate the features and advantages of the present invention, and not to limit the scope of the claims, and that the reagents of the present invention, unless otherwise specified, are conventional and commercially available.
Example 1
150 g of polyaluminum chloride, 100 g of beta-cyclodextrin-polyacrylamide polymer, 200 g of dodecyl dimethyl ammonium chloride, 150 g of sodium bicarbonate and 400 g of fly ash are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and the mixture is crushed to 50-200 meshes to prepare the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 37%.
Example 2
200 g of polyferric sulfate, 150 g of beta-cyclodextrin-polyacrylamide polymer, 100 g of hexadecyl trimethyl ammonium bromide, 200 g of sodium carbonate and 350 g of fly ash are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and crushing is carried out to 50-200 meshes, thus preparing the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 43%.
Example 3
100 g of polyferric sulfate, 150 g of polyaluminium chloride, 50 g of beta-cyclodextrin-polyacrylamide polymer, 150 g of dodecyl dimethyl ammonium chloride, 50 g of sodium carbonate, 150 g of sodium bicarbonate and 350 g of fly ash are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and crushing is carried out to 50-200 meshes, thus preparing the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 44%.
Example 4
Fully mixing 100 g of polyferric sulfate, 120 g of beta-cyclodextrin-polyacrylamide polymer, 180 g of dodecyl dimethyl ammonium chloride, 100 g of sodium bicarbonate and 500 g of diatomite, carrying out forced air drying for 30 min at normal temperature, and crushing to 50-200 meshes to prepare the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then discharging by pressure relief, and testing the water content of the sludge to be 41%.
Example 5
100 g of polyferric sulfate, 100 g of polyaluminium chloride, 100 g of beta-cyclodextrin-polyacrylamide polymer, 150 g of hexadecyl trimethyl ammonium bromide and 550 g of lime are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and crushing is carried out to 50-200 meshes, thus preparing the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 39%.
Example 6
Fully mixing 100 g of polyaluminum chloride, 100 g of beta-cyclodextrin-polyacrylamide polymer, 150 g of dodecyl dimethyl ammonium chloride, 150 g of sodium bicarbonate and 500 g of fly ash, carrying out forced air drying for 30 min at normal temperature, and crushing to 50-200 meshes to prepare the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 32%.
Example 7
150 g of polyferric sulfate, 150 g of beta-cyclodextrin-polyacrylamide polymer, 200 g of hexadecyl trimethyl ammonium bromide, 200 g of sodium bicarbonate and 300 g of lime are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and crushing is carried out to 50-200 meshes, thus preparing the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 47%.
Example 8
250 g of polyaluminum chloride, 100 g of beta-cyclodextrin-polyacrylamide polymer, 120 g of dodecyl dimethyl ammonium chloride, 150 g of sodium carbonate and 380 g of diatomite are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and the mixture is crushed to 50-200 meshes to prepare the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 36%.
Example 9
150 g of polyaluminum chloride, 150 g of beta-cyclodextrin-polyacrylamide polymer, 100 g of dodecyl dimethyl ammonium chloride, 200 g of sodium bicarbonate and 450 g of fly ash are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and the mixture is crushed to 50-200 meshes to prepare the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 46%.
Example 10
250 g of polyaluminum chloride, 150 g of beta-cyclodextrin-polyacrylamide polymer, 200 g of dodecyl dimethyl ammonium chloride, 200 g of sodium bicarbonate and 200 g of fly ash are fully mixed, air-blast drying is carried out for 30 min at normal temperature, and the mixture is crushed to 50-200 meshes to prepare the composite sludge conditioner.
Adding the composite sludge conditioner into sludge with the water content of 98%, wherein the adding amount of the composite sludge conditioner is 10% of the absolute dry weight of the sludge, stirring for 30 min, performing filter pressing and dehydration by using a plate and frame filter press, wherein the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then releasing pressure and discharging, and testing the water content of the sludge to be 44%.
The beta-cyclodextrin-polyacrylamide polymer has the advantages of stable molecular chain, strong anti-shearing capability, compact structure and difficult crushing of floc. The beta-cyclodextrin-polyacrylamide polymer is prepared by the following preparation steps.
Putting 200 g of beta-cyclodextrin into 5L of distilled water, adding 25 g of sodium hydroxide, and stirring for 5min to obtain a beta-cyclodextrin mixed solution; weighing 50 g of p-toluenesulfonyl chloride, dissolving in 100 mL of acetonitrile, slowly dropwise adding into the beta-cyclodextrin mixed solution at 0 ℃, stirring for 4 hours at 4 ℃, adjusting the pH to 6 by using HCl, filtering, collecting precipitate, and drying in vacuum to obtain beta-cyclodextrin sulfonate.
Adding 200 g of polyacrylamide into 5L of distilled water, and stirring and dissolving at 50 ℃; adding 150 g of beta-cyclodextrin sulfonate into the polyacrylamide solution for three times, stirring and reacting for 15 hours at 50 ℃, then drying the reactant in vacuum at 50 ℃, repeatedly washing the obtained solid with methanol and ether for 3 times, filtering, and drying in vacuum to obtain the beta-cyclodextrin-polyacrylamide polymer.
Examples of the experiments
The sludge conditioner prepared in the embodiment 6 of the invention is compared with the traditional sludge conditioner in a dehydration test. The traditional sludge conditioner comprises lime and ferric chloride in a mass ratio of 1: 1.
The composite sludge conditioner of the embodiment 6 is added into the sludge with the water content of 98 percent respectively, the adding amount of the composite sludge conditioner is 10 percent of the absolute dry weight of the sludge, the mixture is stirred for 30 min, filter pressing and dehydration are carried out by a plate and frame filter press, the dehydration pressure is 1.5 Mpa, the dehydration and filter pressing time is 30 min, then the pressure is released, and the water content of the sludge is tested. The addition amount of the traditional sludge conditioner of the control group is 20 percent of the absolute dry weight of the sludge. And a group of the sludge conditioners which are not added is used as a control. The results are shown in Table 1.
Table 1 comparison of the performance of the composite sludge conditioner of the present invention and the conventional sludge conditioner
| Sludge conditioner | Example 4 | Traditional sludge conditioner | Blank space |
| Moisture content (%) of sludge after press filtration and dehydration | 42 | 63 | 84 |
| Adding amount of sludge conditioner | 10% | 20% | 0 |
Compared with the traditional sludge conditioner, the composite sludge conditioner greatly improves the dehydration performance of the sludge.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The composite sludge conditioner is characterized by comprising the following raw materials in percentage by weight: 15-25% of an inorganic polymeric flocculant, 5-15% of an organic flocculant, 10-20% of a cationic surfactant, 10-20% of a regulator and 20-55% of a sludge conditioning and loosening agent.
2. The composite sludge conditioner of claim 1, which is prepared from the following raw materials in percentage by weight: 10% of inorganic polymeric flocculant, 10% of organic flocculant, 15% of cationic surfactant, 15% of regulator and 50% of sludge conditioning and loosening agent.
3. The composite sludge conditioner of claim 1 or 2, wherein: the organic flocculant is a beta-cyclodextrin-polyacrylamide polymer.
4. The composite sludge conditioner of claim 1 or 2, wherein: the inorganic polymeric flocculant is polyaluminium chloride or/and polyferric sulfate.
5. The composite sludge conditioner of claim 1 or 2, wherein: the cationic surfactant is cetyl trimethyl ammonium bromide or dodecyl dimethyl ammonium chloride.
6. The composite sludge conditioner of claim 1 or 2, wherein: the regulator is sodium carbonate or/and sodium bicarbonate.
7. The composite sludge conditioner of claim 1 or 2, wherein: the sludge conditioning and loosening agent is lime, coal ash or diatomite.
8. The composite sludge conditioner of claim 3, wherein: the beta-cyclodextrin-polyacrylamide polymer is prepared by reacting beta-cyclodextrin with tosyl chloride to obtain beta-cyclodextrin sulfonate, and reacting the beta-cyclodextrin sulfonate with polyacrylamide to obtain the beta-cyclodextrin-polyacrylamide polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN113213707A (en) * | 2021-05-31 | 2021-08-06 | 工大环境股份有限公司 | Process method for municipal sewage in-situ standard-lifting and capacity-expanding |
| CN113975703A (en) * | 2021-11-05 | 2022-01-28 | 神美科技有限公司 | Waste incineration fly ash heavy metal chelating agent and preparation method thereof |
| CN114956430A (en) * | 2022-06-23 | 2022-08-30 | 嘉兴学院 | Landfill leachate membrane concentrated solution treatment process |
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