CN117401878B - Method for efficiently dehydrating sludge and application thereof - Google Patents
Method for efficiently dehydrating sludge and application thereof Download PDFInfo
- Publication number
- CN117401878B CN117401878B CN202311716804.7A CN202311716804A CN117401878B CN 117401878 B CN117401878 B CN 117401878B CN 202311716804 A CN202311716804 A CN 202311716804A CN 117401878 B CN117401878 B CN 117401878B
- Authority
- CN
- China
- Prior art keywords
- sludge
- ternary
- stirring
- dewatering
- caalfe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 248
- 238000000034 method Methods 0.000 title claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 230000003750 conditioning effect Effects 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000007800 oxidant agent Substances 0.000 claims abstract description 36
- 239000002893 slag Substances 0.000 claims abstract description 34
- 230000018044 dehydration Effects 0.000 claims abstract description 31
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 31
- 230000001590 oxidative effect Effects 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 69
- 238000003756 stirring Methods 0.000 claims description 61
- 239000000243 solution Substances 0.000 claims description 41
- 239000002245 particle Substances 0.000 claims description 39
- 239000008367 deionised water Substances 0.000 claims description 35
- 229910021641 deionized water Inorganic materials 0.000 claims description 35
- 239000003513 alkali Substances 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 22
- 239000011259 mixed solution Substances 0.000 claims description 21
- 239000012266 salt solution Substances 0.000 claims description 21
- 239000000725 suspension Substances 0.000 claims description 21
- 239000012065 filter cake Substances 0.000 claims description 18
- 230000001143 conditioned effect Effects 0.000 claims description 17
- 238000005303 weighing Methods 0.000 claims description 17
- 229910002554 Fe(NO3)3·9H2O Inorganic materials 0.000 claims description 16
- 239000002244 precipitate Substances 0.000 claims description 14
- 239000008394 flocculating agent Substances 0.000 claims description 11
- 239000000446 fuel Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000010865 sewage Substances 0.000 claims description 7
- 238000001291 vacuum drying Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 239000002817 coal dust Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 claims description 3
- 239000001263 FEMA 3042 Substances 0.000 claims description 3
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 229920002258 tannic acid Polymers 0.000 claims description 3
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 claims description 3
- 229940033123 tannic acid Drugs 0.000 claims description 3
- 235000015523 tannic acid Nutrition 0.000 claims description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 2
- 238000003760 magnetic stirring Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims 2
- 235000019270 ammonium chloride Nutrition 0.000 claims 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005189 flocculation Methods 0.000 abstract description 6
- 230000016615 flocculation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 230000003213 activating effect Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000005012 migration Effects 0.000 abstract description 3
- 238000013508 migration Methods 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 19
- 102000004169 proteins and genes Human genes 0.000 description 8
- 108090000623 proteins and genes Proteins 0.000 description 8
- 150000004676 glycans Chemical class 0.000 description 7
- 229920001282 polysaccharide Polymers 0.000 description 7
- 239000005017 polysaccharide Substances 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 241000361919 Metaphire sieboldi Species 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000009881 electrostatic interaction Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- PZNOBXVHZYGUEX-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine;hydrochloride Chemical compound Cl.C=CCNCC=C PZNOBXVHZYGUEX-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- MYKOKMFESWKQRX-UHFFFAOYSA-N 10h-anthracen-9-one;sulfuric acid Chemical compound OS(O)(=O)=O.C1=CC=C2C(=O)C3=CC=CC=C3CC2=C1 MYKOKMFESWKQRX-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- -1 nitrate ions Chemical class 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
- 230000003647 oxidation Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 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
- C02F11/06—Treatment of sludge; Devices therefor by 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- 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
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/442—Wood or forestry waste
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/445—Agricultural waste, e.g. corn crops, grass clippings, nut shells or oil pressing residues
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Wood Science & Technology (AREA)
- Agronomy & Crop Science (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the field of sludge treatment, in particular to a method for efficiently dehydrating sludge and application thereof, wherein the method for efficiently dehydrating sludge comprises the following processes: the sludge conditioning agent for sludge conditioning is designed for high-pressure dehydration and anaerobic high-temperature treatment, and comprises the following components in parts by weight: 4-50 parts of framework material, 4-24 parts of flocculant and 2-16 parts of oxidant, wherein the framework material is prepared from granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.3: 1-0.6: 1, the framework material can maintain a dehydration channel, avoid blockage, ensure the migration and removal efficiency of free water, and has the advantages of high efficiency on CaO 2 Has activating effect and flocculation strengthening effect, and can break down EPS structure of sludge, release bound water in sludge, promote degradation resistanceThe degradation of the organism and the coordination of the flocculant achieve the conditioning technology of skeleton-flocculation-oxidation, and the sludge dewatering performance is improved.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a method for efficiently dehydrating sludge and application thereof.
Background
Sludge is a byproduct generated in the sewage treatment process along with the solid-liquid separation or carrying process, contains a large amount of pathogenic bacteria, heavy metals and organic micro pollutants, is easy to produce secondary pollution to the environment, and is commonly used in the current sludge treatment modes such as landfill, earthworm cultivation, land utilization, power plant incineration, building materials, fuel utilization and the like, and the power plant incineration has overlarge fuel consumption and increased cost due to overlarge water content; lime is needed for dewatering during landfill, the cost of occupying the waste site resources by increasing the amount of solid waste is high, the earthworm cultivation is affected by weather, the treatment capacity is quite small, the current sludge production capacity is far not met, the utilization of dewatered sludge is an effective way, the heat value of absolute dry sludge is 10000-15000 kJ/kg, even higher than that of coal and coke, and the method has a prospect of being used as fuel.
The water content of the municipal sludge is usually 97% -99%, wherein the free water accounts for about 70%, the combined water accounts for about 10%, and the sludge dewatering is the basis of a sludge treatment process, so that sludge conditioning is needed, physical, chemical and biological pretreatment is performed aiming at the characteristics of high content of the combined water, good dispersibility, difficult dewatering and the like of the sludge, sludge-water separation is realized, and the sludge dewatering difficulty is reduced. The root cause of difficult dehydration of sludge is the hydrophilic property of Extracellular Polymers (EPS), which mainly consists of polysaccharide, protein, nucleic acid and the like, and is divided into Soluble EPS (SEPS), loosely bound EPS (LB-EPS) and tightly bound (TB-EPS); the presence of EPS not only increases negative charges in the system, which is unfavorable for flocculation and sedimentation of sludge, but also becomes a main source of bound water in the sludge due to high hydration of EPS, so that in order to optimize the dewatering performance of sludge, the limitation of EPS on sludge is overcome, and more EPS structures are destroyed to release bound water.
In the prior art, the sludge is firstly subjected to chemical conditioning to improve the dehydration performance, and when the sludge is subjected to conditioning by using flocculating agents, oxidizing agents and the like and then is subjected to mechanical press filtration to remove water, the characteristics of easy deformation of flocs under high pressure cause the blockage of dehydration channels, so that the dehydration efficiency is reduced and even the water cannot be discharged; although the use of the oxidant is helpful to destroy the floc structure and the cell walls of sludge cells and release bound water, the single oxidation treatment can destroy the original structure of the sludge, and a large amount of the oxidant can pollute or hurt human bodies. In the process of chemically conditioning the sludge, various used reagents are required to be used in a controlled amount, so that the environment burden can be increased, the cost of sludge dewatering can be increased, and the dewatering efficiency can be reduced, so that it is very important to seek a sludge conditioner which has a synergistic effect among various components and can quickly and effectively improve the dewatering efficiency.
Disclosure of Invention
Aiming at the problems, the invention provides a method for efficiently dehydrating sludge and application thereof, designs a sludge conditioner for conditioning the sludge before dehydrating the sludge, and a framework material consisting of granular blast furnace slag and ternary CaAlFe layered double hydroxide can maintain a dehydration channel, avoid blockage, ensure migration and removal efficiency of free water and CaO 2 The organic acid-base composite material is used as an oxidant, has the characteristics of environmental friendliness, breaks the EPS structure of the sludge, releases bound water in the sludge, promotes degradation of refractory organic matters, and achieves a framework-flocculation-oxidation conditioning technology by being matched with a flocculating agent.
In order to achieve the above object, the following technical routes are adopted:
a method for the efficient dewatering of sludge comprising the following processes: sludge conditioning, high-pressure dehydration and anaerobic high-temperature treatment;
the sludge conditioning is realized by adding a sludge conditioner into the sludge, wherein the sludge conditioner comprises the following components in parts by weight: 6-48 parts of framework material, 4-24 parts of flocculant and 2-16 parts of oxidant;
wherein, the framework material consists of granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.3: 1-0.6: 1, wherein the oxidant is CaO 2 The flocculant is one or more of polyaluminum chloride, polyferric sulfate, polyacrylamide, tannic acid, polydimethyl diallyl ammonium chloride and polyferric chloride.
Preferably, the ternary CaAlFe layered double hydroxide is prepared from the following raw materials in the following quantitative concentrations: 0.3 to 0.9mol/L Ca (NO) 3 ) 2 ·4H 2 O、0.04~0.16mol/L Fe(NO 3 ) 3 ·9H 2 O、0.04~0.16mol/L Al(NO 3 ) 3 ·9H 2 O、0.1~1mol/L Na 2 CO 3 、1~3mol/L NaOH；
Wherein Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O、Al(NO 3 ) 3 ·9H 2 O、Na 2 CO 3 The purity of NaOH is analytically pure;
the preparation of the ternary CaAlFe layered double hydroxide comprises the following steps:
s1, weighing Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O and Al (NO) 3 ) 3 ·9H 2 O, adding 100mL of deionized water, and ultrasonically oscillating for 10-20 min to dissolve the deionized water to obtain a ternary metal salt solution;
s2, respectively weighing Na 2 CO 3 Adding 100mL of deionized water into NaOH, and ultrasonically oscillating for 10-20 min to dissolve the NaOH to obtain an alkali solution;
s3, taking a dry and clean three-neck flask, adding 100mL of deionized water, slowly dropwise adding the ternary metal salt solution prepared in the step S1 and the alkali solution prepared in the step S2 into the three-neck flask together, wherein the dropwise adding speed is 120 drops/min, magnetically stirring until the solutions are completely mixed after the dropwise adding is completed, and stirring at the speed of 500-800 rpm/min for 10-20 min to obtain a mixed solution;
s4, aging the mixed solution prepared in the step S3 under intense stirring, wherein the stirring speed is 800-1200 rpm/min, and the stirring time is 20-30 min, so as to obtain a suspension;
s5, centrifuging the suspension obtained in the step S4 in a centrifuge at a centrifugal speed of 2000-3000 rpm/min for 5-10 min, and collecting a precipitate;
s6, washing the precipitate obtained in the step S5 by deionized water, drying in a vacuum drying oven at 100 ℃ for 12 hours, wherein the vacuum degree is-0.1 MPa, obtaining the ternary CaAlFe layered double hydroxide, and grinding the ternary CaAlFe layered double hydroxide to ensure that the particles are uniform.
Further, the sludge conditioning comprises the following steps:
q1, taking sludge from a sewage treatment plant, sieving with a 20-mesh sieve to remove large-particle impurities, and storing in a refrigerator at 4 ℃ to obtain a sludge sample;
q2, taking granular blast furnace slag, grinding, and removing large particles to obtain granular blast furnace slag particles for later use;
q3, respectively weighing 10-80 mg/g TS granular blast furnace slag particles, 20-160 mg/g TS ternary CaAlFe layered double hydroxide and 10-80 mg/g TS CaO according to sludge treatment capacity 2 And a flocculant of 20-120 mg/g TS to obtain a sludge conditioner;
q4, placing the sludge sample obtained in the Q1 into a sludge conditioning container, and mechanically stirring at 200-300 rpm/min for 15-45 min to uniformly disperse to obtain well-dispersed sludge;
q5, adding the sludge conditioner according to the components for three times, firstly adding granular blast furnace slag particles and ternary CaAlFe layered double hydroxide, stirring for 10-20 min at 200-300 rpm/min, then adding the flocculant, stirring for 10-20 min at 150-200 rpm/min, finally adding the oxidant, stirring for 10-20 min at 150-200 rpm/min, and standing for 20-40 min to obtain conditioned sludge.
Further, the high-pressure dehydration is to transfer the conditioned sludge obtained in the step Q5 to a plate-and-frame filter press, remove water through pre-dehydration, filtration, extrusion and mechanical extrusion, wherein the dehydration pressure is 2-3 MPa, the dehydration time is 1-3 h, and a dehydrated sludge filter cake is obtained after two times of dehydration.
Further, the anaerobic high temperature treatment is to collect a dehydrated sludge filter cake, place the dehydrated sludge filter cake in an anaerobic environment, heat the sludge filter cake to 400-700 ℃ through an incinerator, and perform anaerobic high temperature treatment for 20-40 min to obtain the strong dehydrated sludge with harmful substances removed.
Further, the completion of the dropwise addition in step S3 means that all the ternary metal salt solution is dropwise added, the alkali solution is dropwise added to maintain the pH of the mixed solution at 10 to 14, and the pH is maintained by controlling the dropwise addition of the alkali solution during the magnetic stirring process.
Further, in the anaerobic high-temperature treatment, one or two of wood dust, coal dust and chaff are added into a sludge filter cake.
The invention also provides application of the method for efficiently dehydrating the sludge, which comprises the following steps:
p1, collecting sludge from sewage treatment facilities or technical processes, and primarily treating the sludge through a screen or a desanding pool to obtain sludge with large-particle impurities removed;
p2, sequentially adding granular blast furnace slag particles and ternary CaAlFe layered double hydroxide into the sludge with large-particle impurities removed in the step P1 according to a sludge powerful dehydration method, stirring for 10-20 min at 200-300 rpm/min, adding a flocculating agent, stirring for 10-20 min at 150-200 rpm/min, adding an oxidizing agent, stirring for 10-20 min at 150-200 rpm/min, and standing for reacting for 20-40 min to obtain conditioned sludge;
p3, sending the conditioned sludge obtained in the step P2 into sludge dewatering equipment, wherein the dewatering equipment is one or two of a centrifuge, a filter press and a belt filter press, so as to obtain a sludge filter cake;
and P4, performing anaerobic high-temperature treatment on the sludge filter cake obtained in the step P3 in an incinerator, wherein the anaerobic high-temperature treatment temperature is 400-700 ℃, the time is 20-40 min, and adding one or two of wood dust, coal dust and chaff to obtain the fuel formed by converting the sludge.
The beneficial effects obtained by the invention are as follows:
the invention provides a method for efficiently dehydrating sludge and application thereof, and designs a sludge conditioner for conditioning the sludge before the sludge is dehydrated, wherein the sludge conditioner consists of a framework material consisting of granular blast furnace slag and ternary CaAlFe layered double hydroxide and an oxidant CaO 2 And a flocculating agent, thereby achieving the conditioning technology of skeleton-flocculation-oxidation. The granular blast furnace slag and the ternary CaAlFe layered double hydroxide are taken as a framework structure to generate more gaps and pores, and the granular blast furnace slag is added into the sludge to form a rigid structure in the high-pressure dehydration process, so that the compression resistance of the sludge is improved, and a channel is provided for migration and removal of free water; ternary CaAlFe layered double hydroxide as a two-dimensional layered material havingThe ternary CaAlFe layered double hydroxide has high positive charge density, can neutralize negative charges on sludge particles, and has the effect of improving flocculation strength by interacting with EPS, for example, the ternary CaAlFe layered double hydroxide can interact with hydroxyl groups in protein to change the secondary structure of the protein, so that free water in EPS is released, and the dewatering capacity is improved; the ternary CaAlFe layered hydroxide is mixed with granular blast furnace slag, forms a framework structure in the sludge, forms electrostatic interaction and is combined with the interaction between EPS, the compressibility of a flocculent structure is reduced, and the release of bound water and the improvement of free water removal efficiency are facilitated. Oxidant CaO 2 The high-energy peroxide covalent bond can slowly release hydrogen peroxide when contacting with water, and can generate hydroxyl free radicals, hydrogen peroxide free radicals and other free radicals with strong oxidability, so that the hydrolysis and catabolism of biodegradable matrixes in sludge can be promoted, EPS structures in the sludge can be broken, bound water in the sludge can be released, and Fe in ternary CaAlFe layered hydroxide in a framework material can be released 3+ Can activate CaO 2 Decomposition and promotion of generation of hydroxyl radicals. The synergistic effect between the framework material and the oxidant strengthens the oxidation-flocculation effect, realizes framework-flocculation-oxidation conditioning by being matched with the flocculant, supplements the three components, can moderately reduce the addition amount of the chemical flocculant and avoids environmental pollution; the sludge powerful dehydration method provided by the invention reduces the water content of the sludge to 30% -35%, and the heat value reaches 1500-3000 kilocalories, so that the solid discharge is greatly reduced, the heat value can be used as common fuel, and the fuel utilization of the sludge is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions thereof, the drawings used in the description of the embodiments and the comparative examples will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a bar graph of SCST measured for each example, comparative example sample;
FIG. 2 is a bar graph of Zeta potentials measured for each example, comparative example sample;
FIG. 3 is a bar graph of SRF measured for each example, comparative example sample;
FIG. 4 is a stacked bar graph showing the protein content of three EPS s measured for each example, comparative example sample;
FIG. 5 is a bar graph showing the cumulative polysaccharide content of three EPS s measured for each of the example and comparative examples.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: the embodiment provides a method for efficiently dehydrating sludge, which comprises the following steps: sludge conditioning, high-pressure dehydration and anaerobic high-temperature treatment;
the sludge conditioning is realized by adding a sludge conditioner into the sludge, wherein the sludge conditioner comprises the following components in parts by weight: 30 parts of framework material, 10 parts of flocculant and 8 parts of oxidant;
wherein, the framework material consists of granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.5:1, wherein the oxidant is CaO 2 The flocculant is tannic acid.
The ternary CaAlFe layered double hydroxide is prepared from the following raw materials in concentration by weight: 0.6mol/L Ca (NO) 3 ) 2 ·4H 2 O、0.04 mol/L Fe(NO 3 ) 3 ·9H 2 O、0.16mol/L Al(NO 3 ) 3 ·9H 2 O、0.5mol/L Na 2 CO 3 2mol/L NaOH, the reagents are all analytically pure;
the preparation of the ternary CaAlFe layered double hydroxide comprises the following steps:
s1, weighing Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O and Al (NO) 3 ) 3 ·9H 2 O, adding 100mL of deionized water, and ultrasonically oscillating for 15min to dissolve the deionized water to obtain a ternary metal salt solution;
s2, respectively weighing Na 2 CO 3 Adding 100mL of deionized water into NaOH, and ultrasonically oscillating for 15min to dissolve the NaOH to obtain an alkali solution;
s3, taking a dry and clean three-neck flask, adding 100mL of deionized water, slowly dropwise adding the ternary metal salt solution prepared in the step S1 and the alkali solution prepared in the step S2 into the three-neck flask together, wherein the dropwise adding speed is 120 drops/min, magnetically stirring until the solution is completely mixed after the dropwise adding is completed, the stirring speed is 600rpm/min, the stirring time is 20min, and obtaining a mixed solution, wherein the dropwise adding completion means that the ternary metal salt solution is completely dropwise added, the alkali solution is dropwise added to keep the pH of the mixed solution to be 12, and the pH is maintained by controlling the dropwise adding of the alkali solution in the magnetically stirring process.
S4, aging the mixed solution prepared in the step S3 under intense stirring at a stirring speed of 900rpm/min for 25min to obtain a suspension;
s5, centrifuging the suspension obtained in the step S4 in a centrifuge at a speed of 2500rpm/min for 7min, and collecting precipitate;
s6, washing the precipitate obtained in the step S5 by deionized water, drying in a vacuum drying oven at 100 ℃ for 12 hours, wherein the vacuum degree is-0.1 MPa, obtaining the ternary CaAlFe layered double hydroxide, and grinding the ternary CaAlFe layered double hydroxide to ensure that the particles are uniform.
The sludge conditioning comprises the following steps:
q1, taking sludge from a sewage treatment plant, sieving with a 20-mesh sieve to remove large-particle impurities, and storing in a refrigerator at 4 ℃ to obtain a sludge sample;
q2, taking granular blast furnace slag, grinding, and removing large particles to obtain granular blast furnace slag particles for later use;
q3, according to sludge treatment amount, weighing 50 mg/g TS granular blast furnace slag particles, 100 mg/g TS ternary CaAlFe layered double hydroxide and 40 mg/g TS CaO respectively 2 And 50 mg/g TS flocculant to obtain a sludge conditioner;
q4, placing the sludge sample obtained in the Q1 into a sludge conditioning container, and mechanically stirring at 200rpm/min for 30min to uniformly disperse to obtain well-dispersed sludge;
q5, adding the sludge conditioner according to the components for three times, firstly adding granular blast furnace slag particles and ternary CaAlFe layered double hydroxide, stirring for 15min at 200rpm, then adding the flocculant, stirring for 15min at 150rpm, finally adding the oxidant, stirring for 15min at 150rpm, and standing for reacting for 30min to obtain the conditioned sludge.
And (3) high-pressure dehydration, namely transferring the conditioned sludge obtained in the step Q5 to a plate-and-frame filter press, and dehydrating by pre-dehydration, filtration, extrusion and mechanical extrusion, wherein the dehydration pressure is 3MPa, the dehydration time is 2h, and a dehydrated sludge filter cake is obtained after two times of dehydration.
The anaerobic high temperature treatment is to collect dewatered sludge filter cake, place the dewatered sludge filter cake in anaerobic environment, heat to 600 deg.c in incinerator, anaerobic high temperature treat for 30min to obtain powerful dewatered sludge with eliminated harmful matters, and add wood dust and coal dust into the sludge filter cake.
The embodiment also provides an application of the method for efficiently dehydrating the sludge, which comprises the following steps:
p1, collecting sludge from sewage treatment facilities or technical processes, and primarily treating the sludge through a screen or a desanding pool to obtain sludge with large-particle impurities removed;
p2, sequentially adding granular blast furnace slag particles and ternary CaAlFe layered double hydroxide into the sludge with large-particle impurities removed in the step P1 according to a sludge powerful dehydration method, stirring for 15min at 200rpm, adding a flocculating agent, stirring for 15min at 150rpm, adding an oxidizing agent, stirring for 15min at 150rpm, and standing for reaction for 30min to obtain conditioned sludge;
p3, sending the conditioned sludge obtained in the step P2 into a sludge dewatering device, wherein the dewatering device is a belt filter press, so as to obtain a sludge filter cake;
and P4, performing anaerobic high-temperature treatment on the sludge filter cake obtained in the step P3 in an incinerator, wherein the anaerobic high-temperature treatment temperature is 600 ℃, the time is 30min, and adding wood dust and coal dust to obtain the fuel converted from the sludge.
Example 2: the embodiment provides a method for efficiently dehydrating sludge, which comprises the following steps: sludge conditioning, high-pressure dehydration and anaerobic high-temperature treatment;
the sludge conditioning is realized by adding a sludge conditioner into the sludge, wherein the sludge conditioner comprises the following components in parts by weight: 30 parts of framework material, 10 parts of flocculant and 8 parts of oxidant;
wherein, the framework material consists of granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.5:1, wherein the oxidant is CaO 2 The flocculant is polydimethyl diallyl ammonium chloride.
The ternary CaAlFe layered double hydroxide is prepared from the following raw materials in concentration by weight: 0.6mol/L Ca (NO) 3 ) 2 ·4H 2 O、0.08 mol/L Fe(NO 3 ) 3 ·9H 2 O、0.12mol/L Al(NO 3 ) 3 ·9H 2 O、0.5mol/L Na 2 CO 3 2mol/L NaOH, the reagents are all analytically pure;
the preparation of the ternary CaAlFe layered double hydroxide comprises the following steps:
s1, weighing Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O and Al (NO) 3 ) 3 ·9H 2 O, adding 100mL of deionized water, and ultrasonically oscillating for 15min to dissolve the deionized water to obtain a ternary metal salt solution;
s2, respectively weighing Na 2 CO 3 Adding 100mL of deionized water into NaOH, and ultrasonically oscillating for 15min to dissolve the NaOH to obtain an alkali solution;
s3, taking a dry and clean three-neck flask, adding 100mL of deionized water, slowly dropwise adding the ternary metal salt solution prepared in the step S1 and the alkali solution prepared in the step S2 into the three-neck flask together, wherein the dropwise adding speed is 120 drops/min, magnetically stirring until the solution is completely mixed after the dropwise adding is completed, the stirring speed is 600rpm/min, the stirring time is 20min, and obtaining a mixed solution, wherein the dropwise adding completion means that the ternary metal salt solution is completely dropwise added, the alkali solution is dropwise added to keep the pH of the mixed solution to be 12, and the pH is maintained by controlling the dropwise adding of the alkali solution in the magnetically stirring process.
S4, aging the mixed solution prepared in the step S3 under intense stirring at a stirring speed of 900rpm/min for 25min to obtain a suspension;
s5, centrifuging the suspension obtained in the step S4 in a centrifuge at a speed of 2500rpm/min for 7min, and collecting precipitate;
s6, washing the precipitate obtained in the step S5 by deionized water, drying in a vacuum drying oven at 100 ℃ for 12 hours, wherein the vacuum degree is-0.1 MPa, obtaining the ternary CaAlFe layered double hydroxide, and grinding the ternary CaAlFe layered double hydroxide to ensure that the particles are uniform.
The sludge conditioning step and the sludge powerful dewatering method in this example are applied in the same manner as in example 1.
Example 3: the embodiment provides a method for efficiently dehydrating sludge, which comprises the following steps: sludge conditioning, high-pressure dehydration and anaerobic high-temperature treatment;
the sludge conditioning is realized by adding a sludge conditioner into the sludge, wherein the sludge conditioner comprises the following components in parts by weight: 30 parts of framework material, 10 parts of flocculant and 8 parts of oxidant;
wherein, the framework material consists of granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.5:1, wherein the oxidant is CaO 2 The flocculant is polyaluminum chloride.
The ternary CaAlFe layered double hydroxide is prepared from the following raw materials in concentration by weight: 0.6mol/L Ca (NO) 3 ) 2 ·4H 2 O、0.1mol/L Fe(NO 3 ) 3 ·9H 2 O、0.1mol/L Al(NO 3 ) 3 ·9H 2 O、0.5mol/L Na 2 CO 3 2mol/L NaOH, the reagents are all analytically pure;
the preparation of the ternary CaAlFe layered double hydroxide comprises the following steps:
s1, weighing Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O and Al (NO) 3 ) 3 ·9H 2 O, adding 100mL of deionized water, and ultrasonically oscillating for 15min to dissolve the deionized water to obtain a ternary metal salt solution;
s2, respectively weighing Na 2 CO 3 Adding 100mL of deionized water into NaOH, and ultrasonically oscillating for 15min to dissolve the NaOH to obtain an alkali solution;
s3, taking a dry and clean three-neck flask, adding 100mL of deionized water, slowly dropwise adding the ternary metal salt solution prepared in the step S1 and the alkali solution prepared in the step S2 into the three-neck flask together, wherein the dropwise adding speed is 120 drops/min, magnetically stirring until the solution is completely mixed after the dropwise adding is completed, the stirring speed is 600rpm/min, the stirring time is 20min, and obtaining a mixed solution, wherein the dropwise adding completion means that the ternary metal salt solution is completely dropwise added, the alkali solution is dropwise added to keep the pH of the mixed solution to be 12, and the pH is maintained by controlling the dropwise adding of the alkali solution in the magnetically stirring process.
S4, aging the mixed solution prepared in the step S3 under intense stirring at a stirring speed of 900rpm/min for 25min to obtain a suspension;
s5, centrifuging the suspension obtained in the step S4 in a centrifuge at a speed of 2500rpm/min for 7min, and collecting precipitate;
s6, washing the precipitate obtained in the step S5 by deionized water, drying in a vacuum drying oven at 100 ℃ for 12 hours, wherein the vacuum degree is-0.1 MPa, obtaining the ternary CaAlFe layered double hydroxide, and grinding the ternary CaAlFe layered double hydroxide to ensure that the particles are uniform.
The sludge conditioning step and the method for efficiently dewatering sludge in this example are applied in the same manner as in example 1.
Example 4: the embodiment provides a method for efficiently dehydrating sludge, which comprises the following steps: sludge conditioning, high-pressure dehydration and anaerobic high-temperature treatment;
the sludge conditioning is realized by adding a sludge conditioner into the sludge, wherein the sludge conditioner comprises the following components in parts by weight: 30 parts of framework material, 10 parts of flocculant and 8 parts of oxidant;
wherein, the framework material consists of granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.5:1, wherein the oxidant is CaO 2 The flocculant is polyacrylamide.
The ternary CaAlFe layered double hydroxide is prepared from the following raw materials in concentration by weight: 0.6mol/L Ca (NO) 3 ) 2 ·4H 2 O、0.12mol/L Fe(NO 3 ) 3 ·9H 2 O、0.08mol/L Al(NO 3 ) 3 ·9H 2 O、0.5mol/L Na 2 CO 3 2mol/L NaOH, the reagents are all analytically pure;
the preparation of the ternary CaAlFe layered double hydroxide comprises the following steps:
s1, weighing Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O and Al (NO) 3 ) 3 ·9H 2 O, adding 100mL of deionized water, and ultrasonically oscillating for 15min to dissolve the deionized water to obtain a ternary metal salt solution;
s2, respectively weighing Na 2 CO 3 Adding 100mL of deionized water into NaOH, and ultrasonically oscillating for 15min to dissolve the NaOH to obtain an alkali solution;
s3, taking a dry and clean three-neck flask, adding 100mL of deionized water, slowly dropwise adding the ternary metal salt solution prepared in the step S1 and the alkali solution prepared in the step S2 into the three-neck flask together, wherein the dropwise adding speed is 120 drops/min, magnetically stirring until the solution is completely mixed after the dropwise adding is completed, the stirring speed is 600rpm/min, the stirring time is 20min, and obtaining a mixed solution, wherein the dropwise adding completion means that the ternary metal salt solution is completely dropwise added, the alkali solution is dropwise added to keep the pH of the mixed solution to be 12, and the pH is maintained by controlling the dropwise adding of the alkali solution in the magnetically stirring process.
S4, aging the mixed solution prepared in the step S3 under intense stirring at a stirring speed of 900rpm/min for 25min to obtain a suspension;
s5, centrifuging the suspension obtained in the step S4 in a centrifuge at a speed of 2500rpm/min for 7min, and collecting precipitate;
s6, washing the precipitate obtained in the step S5 by deionized water, drying in a vacuum drying oven at 100 ℃ for 12 hours, wherein the vacuum degree is-0.1 MPa, obtaining the ternary CaAlFe layered double hydroxide, and grinding the ternary CaAlFe layered double hydroxide to ensure that the particles are uniform.
The sludge conditioning step and the method for efficiently dewatering sludge in this example are applied in the same manner as in example 1.
Example 5: the embodiment provides a method for efficiently dehydrating sludge, which comprises the following steps: sludge conditioning, high-pressure dehydration and anaerobic high-temperature treatment;
the sludge conditioning is realized by adding a sludge conditioner into the sludge, wherein the sludge conditioner comprises the following components in parts by weight: 30 parts of framework material, 10 parts of flocculant and 8 parts of oxidant;
wherein, the framework material consists of granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.5:1, wherein the oxidant is CaO 2 The flocculant is polymeric ferric chloride.
The ternary CaAlFe layered double hydroxide is prepared from the following raw materials in concentration by weight: 0.6mol/L Ca (NO) 3 ) 2 ·4H 2 O、0.16 mol/L Fe(NO 3 ) 3 ·9H 2 O、0.04mol/L Al(NO 3 ) 3 ·9H 2 O、0.5mol/L Na 2 CO 3 2mol/L NaOH, the reagents are all analytically pure;
the preparation of the ternary CaAlFe layered double hydroxide comprises the following steps:
s1, weighing Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O and Al (NO) 3 ) 3 ·9H 2 O, adding 100mL of deionized water, and ultrasonically oscillating for 15min to dissolve the deionized water to obtain a ternary metal salt solution;
s2, respectively weighing Na 2 CO 3 Adding 100mL of deionized water into NaOH, and ultrasonically oscillating for 15min to dissolve the NaOH to obtain an alkali solution;
s3, taking a dry and clean three-neck flask, adding 100mL of deionized water, slowly dropwise adding the ternary metal salt solution prepared in the step S1 and the alkali solution prepared in the step S2 into the three-neck flask together, wherein the dropwise adding speed is 120 drops/min, magnetically stirring until the solution is completely mixed after the dropwise adding is completed, the stirring speed is 600rpm/min, the stirring time is 20min, and obtaining a mixed solution, wherein the dropwise adding completion means that the ternary metal salt solution is completely dropwise added, the alkali solution is dropwise added to keep the pH of the mixed solution to be 12, and the pH is maintained by controlling the dropwise adding of the alkali solution in the magnetically stirring process.
S4, aging the mixed solution prepared in the step S3 under intense stirring at a stirring speed of 900rpm/min for 25min to obtain a suspension;
s5, centrifuging the suspension obtained in the step S4 in a centrifuge at a speed of 2500rpm/min for 7min, and collecting precipitate;
s6, washing the precipitate obtained in the step S5 by deionized water, drying in a vacuum drying oven at 100 ℃ for 12 hours, wherein the vacuum degree is-0.1 MPa, obtaining the ternary CaAlFe layered double hydroxide, and grinding the ternary CaAlFe layered double hydroxide to ensure that the particles are uniform.
The sludge conditioning step and the method for efficiently dewatering sludge in this example are applied in the same manner as in example 1.
Comparative example 1:
based on example 2, it differs in that the framework material is only granular blast furnace slag particles, and no ternary CaAlFe layered double hydroxide is added.
Comparative example 2:
based on example 2, it is different in that the sludge conditioner is composed of the following components in parts by weight: 6 parts of framework material, 10 parts of flocculating agent and 8 parts of oxidant, namely granular blast furnace slag particles with the addition amount of the framework material in sludge of 10 mg/g TS and ternary CaAlFe layered double hydroxide with the addition amount of 20 mg/g TS, and the rest steps and the rest methods are the same as those of the example 2.
Comparative example 3:
based on example 2, it is different in that the sludge conditioner is composed of the following components in parts by weight: 21 parts of framework material, 10 parts of flocculating agent and 8 parts of oxidant, namely granular blast furnace slag particles with the addition amount of 70 mg/g TS of the framework material in sludge and ternary CaAlFe layered double hydroxide with the addition amount of 35 mg/g TS, and the rest steps and the rest methods are the same as those of the example 2.
Comparative example 4:
based on example 2, it is different in that the sludge conditioner is composed of the following components in parts by weight: 39 parts of framework material, 10 parts of flocculating agent and 8 parts of oxidant, namely granular blast furnace slag particles with the addition amount of 130 mg/g TS of the framework material in sludge and ternary CaAlFe layered double hydroxide with the addition amount of 65 mg/g TS, and the rest steps and the rest methods are the same as those of the example 2.
Comparative example 5:
based on example 2, it is different in that the sludge conditioner is composed of the following components in parts by weight: 48 parts of framework material, 10 parts of flocculating agent and 8 parts of oxidant, namely granular blast furnace slag particles with the addition amount of 160 mg/g TS of the framework material in sludge and 80 mg/g TS of ternary CaAlFe layered double hydroxide, and the rest steps and the method are the same as those of the example 2.
Experimental example:
1. standard capillary water uptake time (SCST):
taking 100mL of sludge with large-particle impurities removed, sequentially adding a framework material, a flocculating agent and an oxidizing agent into a 500mL beaker according to the formula proportion of different examples and comparative examples, conditioning a sludge sample according to the steps of Q1-Q5, measuring (HDFC-10A) by using a CST tester in CST measurement, and carrying out standardized CST calculation by using CST data measured before and after sludge conditioning, wherein the calculation formula is as follows:
SCST=CST a /CST 0 ；
CST a -a CST value of the conditioned sludge sample;
CST 0 CST value of the raw sludge sample.
The SCST values measured for each example and comparative example are shown in table 1 and fig. 1.
Eps analysis:
the EPS is extracted by adopting an improved heat extraction mode, firstly, the sludge suspension before and after conditioning is centrifugally dehydrated in a 50mL pipe for 5min at the centrifugal speed of 4000g, the sludge particles in the pipe are resuspended in 15mL of 0.05% NaCl solution, and the sludge mixture is diluted to the initial volume of 50mL by the NaCl solution heated to 70 ℃ so as to ensure that the sludge suspension immediately reaches the temperature of 50 ℃. Shearing the sludge suspension for 1min by using a vortex mixer, and centrifuging for 10min at a rotating speed of 4000g, wherein organic matters in supernatant are EPS which is easy to extract and are used as LB-EPS; when extracting TB-EPS, the residual sludge pellets in the centrifuge tube are resuspended to an initial volume of 50mL by using 0.05% NaCl solution, the sludge suspension is heated in a water bath at 60 ℃ for 30min, then the sludge mixture is centrifuged in a centrifuge for 15min at 4000g, and the supernatant is collected as TB-EPS extract of the sludge sample.
Polysaccharide content in EPS was determined by sulfuric acid-anthrone method, and protein content was determined by Fu Lin Fen method.
The SCST values measured for each example and comparative example are shown in table 2, fig. 4 and fig. 5.
Zeta potential:
and carrying out Zeta potential test on the sludge before and after conditioning by adopting a Zeta potential analyzer.
The SCST values measured for each example and comparative example are shown in table 1 and fig. 2.
4. Sludge Specific Resistance (SRF):
the dewatering performance of the sludge suspension was determined using a filterability test. The sludge filtration test was performed in a 350mL stirred tank using a 0.22mm flat cellulose membrane filter, 250mL of a sample of the sludge suspension was charged in the stirred tank, a constant pressure of 25kPa was applied with pressurized nitrogen gas from a gas cylinder, and the filtrate yield under pressure was continuously recorded by an electronic scale connected to a data logger, calculated according to the following formula:
SRF=(2000A 2 △Pb)/(μC)；
ΔP-applied pressure (kPa);
a-filtration area (m) 2 ）；
Mu-permeate viscosity (mPas);
c-sludge concentration in sludge suspension (kg/m) 3 ）；
b-the slope of the curve obtained by plotting the ratio of the filtration time to the filtration volume (t/V) to the ratio of the filtrate volume (V), in (s/m) 6 ）。
The SCST values measured for each example and comparative example are shown in table 1 and fig. 3.
TABLE 1 results of SCST, zeta potential and SRF test of examples and comparative examples
TABLE 2 EPS analytical test results for samples of examples and comparative examples
In the examples, the effect of the amount of each metal salt used in the synthesis of the ternary CaAlFe layered double hydroxide on the dewatering performance of the ternary CaAlFe layered double hydroxide in the efficient dewatering of sludge was compared, and it was found that when the amounts of the components of the sludge conditioner were constant, the effect of Fe 3+ The sludge dewatering performance tends to be enhanced and then weakened, which is derived from interaction of the self surface positive charges of the ternary CaAlFe layered double hydroxide and EPS in the sludge, improves flocculation strength and also benefits from Fe in the ternary CaAlFe layered double hydroxide 3+ For oxidant CaO 2 The activated water-based EPS foam has the advantages that the activated water-based EPS foam has an activating effect, can promote the generation of hydroxyl free radicals, accelerates the wall breaking effect of an oxidant on EPS, and releases bound water in the EPS foam; the addition proportion of the three metal elements can also influence the electronic structure and charge distribution of the surface of the ternary CaAlFe layered double hydroxide, the interaction between electrostatic interaction and EPS is changed, and the enhancement of the two interactions is beneficial to the enhancement of the sludge dewatering performance.
In comparative example, the addition amount of the framework material and the granulated blast furnace slagThe proportion of the three-element CaAlFe layered double hydroxide has influence on the sludge dewatering performance, and the increase of the content of the framework material is beneficial to the improvement of the sludge dewatering performance, and the framework material has the functions of strengthening flocculation and activating CaO 2 The amount of flocculant and oxidant used in the application can be reduced according to the specific condition of the sludge. The granular blast furnace slag generates high solid content in the sludge conditioning process, is favorable for forming a stricter lattice structure, and the ternary CaAlFe layered double hydroxide has a stable layered porous structure, and the ternary CaAlFe layered double hydroxide is combined with the sludge to be added as a rigid structure shown by a framework material, so that a large number of pore structures are formed in the sludge conditioning and dewatering processes, the pore structures are not blocked during compression, the release effect of bound water in EPS and the free water removal efficiency are improved, and the porosity of the sludge flocs conditioned by the sludge conditioner is obviously improved; the anion exchange property of the ternary CaAlFe layered double hydroxide is helpful for removing nitrate ions, phosphate ions and the like in the sludge.
From the analysis of table 2, fig. 4 and fig. 5, it can be seen that the content of protein and polysaccharide in EPS of the conditioned sludge varies, which can reflect the degree of EPS cracking in sludge flocs. With the increase of the addition amount of the ternary CaAlFe layered double hydroxide, the contents of protein and polysaccharide in TB-EPS and LB-EPS are reduced, namely, the structures of the protein and polysaccharide in the loose combined EPS and the tight combined EPS are greatly destroyed, and the protein is taken as a high water-retaining substance to release a large amount of bound water, so that the dehydration effect is improved; the protein and polysaccharide content in S-EPS is increased, namely, the intracellular organics are released into the supernatant after the LB-EPS and the TB-EPS are cracked. By the sludge powerful dehydration method provided by the invention, the water content of the dehydrated sludge is reduced to 30-35%, the dehydrated sludge is converted into fuel, and the heat value of the dehydrated sludge reaches 1500-3000 kilocalories.
The above embodiments are only some, but not all embodiments of the present invention, and the drawings of the present invention are also illustrative of some embodiments. The detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention, based on which one skilled in the art, without inventive effort, may derive other embodiments of the invention that fall within the scope of the invention.
Claims (7)
1. A method for the efficient dewatering of sludge, comprising the following steps: sludge conditioning, high-pressure dehydration and anaerobic high-temperature treatment;
the sludge conditioning is realized by adding a sludge conditioner into the sludge, wherein the sludge conditioner comprises the following components in parts by weight: 6-48 parts of framework material, 4-24 parts of flocculant and 2-16 parts of oxidant;
the framework material is prepared from granular blast furnace slag and ternary CaAlFe layered double hydroxide according to the weight ratio of 0.3: 1-0.6: 1, wherein the oxidant is CaO 2 The flocculant is one or more of polyaluminum chloride, polymeric ferric sulfate, polyacrylamide, tannic acid, polydimethyldiallyl ammonium chloride and polymeric ferric chloride;
the sludge conditioning comprises the following steps:
q1, taking sludge from a sewage treatment plant, sieving with a 20-mesh sieve to remove large-particle impurities, and storing in a refrigerator at 4 ℃ to obtain a sludge sample;
q2, taking granular blast furnace slag, grinding, and removing large particles to obtain granular blast furnace slag particles for later use;
q3, respectively weighing 10-80 mg/g TS granular blast furnace slag particles, 20-160 mg/g TS ternary CaAlFe layered double hydroxide and 10-80 mg/g TS CaO according to sludge treatment capacity 2 And a flocculant of 20-120 mg/g TS to obtain a sludge conditioner;
q4, placing the sludge sample obtained in the Q1 into a sludge conditioning container, and mechanically stirring at 200-300 rpm/min for 15-45 min to uniformly disperse to obtain well-dispersed sludge;
q5, adding the sludge conditioner according to the components for three times, firstly adding granular blast furnace slag particles and ternary CaAlFe layered double hydroxide, stirring for 10-20 min at 200-300 rpm/min, then adding the flocculant, stirring for 10-20 min at 150-200 rpm/min, finally adding the oxidant, stirring for 10-20 min at 150-200 rpm/min, and standing for 20-40 min to obtain conditioned sludge.
2. The method for the efficient dewatering of sludge according to claim 1, characterized in that said ternary CaAlFe layered double hydroxide is prepared from the following raw materials in the following quantitative concentrations: 0.3 to 0.9mol/L Ca (NO) 3 ) 2 ·4H 2 O、0.04~0.16mol/L Fe(NO 3 ) 3 ·9H 2 O、0.04~0.16mol/L Al(NO 3 ) 3 ·9H 2 O、0.1~1mol/L Na 2 CO 3 、1~3mol/L NaOH；
Wherein the Ca (NO 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O、Al(NO 3 ) 3 ·9H 2 O、Na 2 CO 3 The purity of NaOH is analytically pure;
the preparation of the ternary CaAlFe layered double hydroxide comprises the following steps:
s1, weighing Ca (NO) 3 ) 2 ·4H 2 O、Fe(NO 3 ) 3 ·9H 2 O and Al (NO) 3 ) 3 ·9H 2 O, adding 100mL of deionized water, and ultrasonically oscillating for 10-20 min to dissolve the deionized water to obtain a ternary metal salt solution;
s2, respectively weighing Na 2 CO 3 Adding 100mL of deionized water into NaOH, and ultrasonically oscillating for 10-20 min to dissolve the NaOH to obtain an alkali solution;
s3, taking a dry and clean three-neck flask, adding 100mL of deionized water, slowly dropwise adding the ternary metal salt solution prepared in the step S1 and the alkali solution prepared in the step S2 into the three-neck flask together, wherein the dropwise adding speed is 120 drops/min, magnetically stirring until the solutions are completely mixed after the dropwise adding is completed, and stirring at the speed of 500-800 rpm/min for 10-20 min to obtain a mixed solution;
s4, aging the mixed solution prepared in the step S3 under intense stirring, wherein the stirring speed is 800-1200 rpm/min, and the stirring time is 20-30 min, so as to obtain a suspension;
s5, centrifuging the suspension obtained in the step S4 in a centrifuge at a centrifugal speed of 2000-3000 rpm/min for 5-10 min, and collecting a precipitate;
s6, washing the precipitate obtained in the step S5 by deionized water, drying in a vacuum drying oven at 100 ℃ for 12 hours, wherein the vacuum degree is-0.1 MPa, obtaining the ternary CaAlFe layered double hydroxide, and grinding the ternary CaAlFe layered double hydroxide to ensure that the particles are uniform.
3. The method for efficiently dewatering sludge according to claim 2, wherein the high-pressure dewatering is to transfer the conditioned sludge obtained in the step Q5 to a plate-and-frame filter press, dewater the conditioned sludge by pre-dewatering, filtering, extruding and mechanically squeezing, dewatering the conditioned sludge at a dewatering pressure of 2-3 mpa for a dewatering time of 1-3 h, and obtain a dewatered sludge filter cake after two times of dewatering.
4. The method for efficiently dewatering sludge according to claim 3, wherein the anaerobic high-temperature treatment is to collect dewatered sludge filter cake, place the dewatered sludge filter cake in an anaerobic environment, heat up to 400-700 ℃ by an incinerator, and perform anaerobic high-temperature treatment for 20-40 min to obtain the efficient dewatered sludge with harmful substances removed.
5. The method for efficiently dewatering sludge according to claim 4, wherein the completion of the dropping in step S3 means that all the ternary metal salt solution is dropped, the alkali solution is dropped to maintain the pH of the mixed solution at 10 to 14, and the pH is maintained by controlling the dropping of the alkali solution during the magnetic stirring.
6. The method for efficiently dewatering sludge according to claim 5, wherein in said anaerobic high temperature treatment, one or two of wood dust, coal dust and chaff are added to a sludge cake to obtain a fuel obtained by converting sludge.
7. Use of a method for the efficient dewatering of sludge according to any of claims 1-6, characterized by the following steps:
p1, collecting sludge from sewage treatment facilities or technical processes, and primarily treating the sludge through a screen or a desanding pool to obtain sludge with large-particle impurities removed;
p2, sequentially adding granular blast furnace slag particles and ternary CaAlFe layered double hydroxide into the sludge with large-particle impurities removed in the step P1 according to a sludge powerful dehydration method, stirring for 10-20 min at 200-300 rpm/min, adding a flocculating agent, stirring for 10-20 min at 150-200 rpm/min, adding an oxidizing agent, stirring for 10-20 min at 150-200 rpm/min, and standing for reacting for 20-40 min to obtain conditioned sludge;
p3, sending the conditioned sludge obtained in the step P2 into sludge dewatering equipment, wherein the dewatering equipment is one or two of a centrifuge, a filter press and a belt filter press, so as to obtain a sludge filter cake;
and P4, performing anaerobic high-temperature treatment on the sludge filter cake obtained in the step P3 in an incinerator, wherein the anaerobic high-temperature treatment temperature is 400-700 ℃, the time is 20-40 min, and adding one or two of wood dust, coal dust and chaff to obtain the fuel formed by converting the sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311716804.7A CN117401878B (en) | 2023-12-14 | 2023-12-14 | Method for efficiently dehydrating sludge and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311716804.7A CN117401878B (en) | 2023-12-14 | 2023-12-14 | Method for efficiently dehydrating sludge and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117401878A CN117401878A (en) | 2024-01-16 |
| CN117401878B true CN117401878B (en) | 2024-02-13 |
Family
ID=89494786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311716804.7A Active CN117401878B (en) | 2023-12-14 | 2023-12-14 | Method for efficiently dehydrating sludge and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117401878B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118125693A (en) * | 2024-03-18 | 2024-06-04 | 江苏宜净水处理化学品有限公司 | Novel sludge concentration additive, preparation method thereof and application thereof in sludge dewatering |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004051410A (en) * | 2002-07-19 | 2004-02-19 | Denki Kagaku Kogyo Kk | Solidifier and process for cleaning contaminated soil using this |
| CN101337759A (en) * | 2008-08-18 | 2009-01-07 | 哈尔滨工业大学 | Dewatering process for domestic sludge |
| CN110217956A (en) * | 2019-06-19 | 2019-09-10 | 武汉市城市排水发展有限公司 | For the stabilized combination conditioner of deeply dehydrating sludge collaboration mud cake and application |
| CN115010344A (en) * | 2022-06-24 | 2022-09-06 | 昭仕（厦门）新材料有限公司 | Sludge dehydrating agent and application method thereof in sludge dehydrating |
| CN115745334A (en) * | 2022-11-24 | 2023-03-07 | 中国科学院西北生态环境资源研究院 | Sludge deodorization conditioner and sludge deodorization stabilization treatment method |
-
2023
- 2023-12-14 CN CN202311716804.7A patent/CN117401878B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004051410A (en) * | 2002-07-19 | 2004-02-19 | Denki Kagaku Kogyo Kk | Solidifier and process for cleaning contaminated soil using this |
| CN101337759A (en) * | 2008-08-18 | 2009-01-07 | 哈尔滨工业大学 | Dewatering process for domestic sludge |
| CN110217956A (en) * | 2019-06-19 | 2019-09-10 | 武汉市城市排水发展有限公司 | For the stabilized combination conditioner of deeply dehydrating sludge collaboration mud cake and application |
| CN115010344A (en) * | 2022-06-24 | 2022-09-06 | 昭仕（厦门）新材料有限公司 | Sludge dehydrating agent and application method thereof in sludge dehydrating |
| CN115745334A (en) * | 2022-11-24 | 2023-03-07 | 中国科学院西北生态环境资源研究院 | Sludge deodorization conditioner and sludge deodorization stabilization treatment method |
Non-Patent Citations (4)
| Title |
|---|
| Improving sewage sludge dewaterability via heterogeneous activation of persulfate by Fe–Al layered double hydroxide: Role of generated SO4- •;Benyi Xiao等;Journal of Environmental Management;20230519;第342卷;118194 * |
| Performanc e and mechanisms of wastewater sludge conditioning with slag-ba sed hydrotalcite-like minerals (Ca/M g/Al-LDH);Weijun Zhang等;Water Research;20191102;第169卷;115265 * |
| Synthesis and Structural Analysis of Ternary Ca–Al–Fe Layered Double Hydroxides with Different Iron Contents;Jing Xie等;Crystals;20211026;第11卷;1296 * |
| 污泥深度脱水絮凝剂的筛选以及采用无机微粒作为助凝剂对污泥脱水性能的优化;吴素花;李平;徐杰;徐开熠;肖兰;;净水技术;20160425;第35卷(第02期);第64-70页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117401878A (en) | 2024-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN117401878B (en) | Method for efficiently dehydrating sludge and application thereof | |
| CN104193127B (en) | The treatment process of excess sludge after a kind of biological wastewater treatment | |
| CN111437825B (en) | Iron-manganese biochar catalyst and application thereof in conditioning sludge dewatering | |
| CN101716487B (en) | Steel slag composite adsorbing agent and method for processing printing and dyeing wastewater | |
| CN105540988B (en) | The waste water treatment process combined based on super Magneto separate and microwave energy technology | |
| CN110228935B (en) | Sludge dewatering pretreatment device and method | |
| CN109647850B (en) | Treatment system for co-treating waste incineration fly ash and waste leachate | |
| CN109574459B (en) | Method for improving sludge dewatering performance by utilizing combined conditioning of segmented microbubble ozone and surfactant | |
| CN104724898B (en) | A kind of sludge pretreatment technique | |
| Xie et al. | Dewaterability enhancement and heavy metals immobilization by pig manure biochar addition during hydrothermal treatment of sewage sludge | |
| CN103359908A (en) | Method for improving dehydration performance of residual sludge by assisting oxidization of ferrate by utilizing ultrasonic waves | |
| CN101973619B (en) | Method for treating waste water from copper smelting by using modified ardealite | |
| CN104788002B (en) | A kind of sludge pretreatment equipment | |
| Yang et al. | Explore the closed-loop disposal route of surplus sludge: Sludge self-circulation preparation of sludge-based biochar (SBB) to enhance sludge dewaterability | |
| Ma et al. | Improvement of sludge dewaterability with modified cinder via affecting EPS | |
| CN103359907A (en) | Novel environment friendly conditioner for deep dehydration of sludge | |
| Wang et al. | Behavior and mechanism of low-concentration rare earth ions precipitated by the microbial humic-like acids | |
| CN104399315A (en) | Method for simultaneously detoxicating and dehydrating cyanobacteria | |
| CN110642356A (en) | Method for treating heavy metal-containing wastewater by using modified expanded vermiculite | |
| CN110818047A (en) | Preparation method of polysilicate ferro-manganese graphene flocculant | |
| CN110092562A (en) | A kind of sludge dewatering by plate-frame method and conditioner used | |
| CN114804581A (en) | Combined enhanced sludge dewatering method | |
| CN204685645U (en) | The treating apparatus of waste cathode carbon block | |
| CN112592011A (en) | Excess sludge cracking agent and preparation method and application thereof | |
| Tinega et al. | Potential removal of chromium (VI) ions by macadamia nutshell from steel industry wastewater. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |