CN115448554B - Method for preparing high-heat-value mud cake by using high-water-content organic sludge - Google Patents
Method for preparing high-heat-value mud cake by using high-water-content organic sludge Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 200
- 238000000034 method Methods 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 70
- 238000005189 flocculation Methods 0.000 claims abstract description 65
- 230000016615 flocculation Effects 0.000 claims abstract description 65
- 239000003607 modifier Substances 0.000 claims abstract description 58
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- 238000003756 stirring Methods 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 33
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims abstract description 33
- 238000001035 drying Methods 0.000 claims abstract description 31
- 230000018044 dehydration Effects 0.000 claims abstract description 22
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000008394 flocculating agent Substances 0.000 claims abstract description 16
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 16
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 15
- 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 abstract description 15
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 33
- 239000000292 calcium oxide Substances 0.000 claims description 20
- 239000000446 fuel Substances 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 13
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- -1 polysiloxane Polymers 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011541 reaction mixture Substances 0.000 claims description 6
- 239000004323 potassium nitrate Substances 0.000 claims description 5
- 235000010333 potassium nitrate Nutrition 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
- 238000000748 compression moulding Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 33
- 239000003344 environmental pollutant Substances 0.000 abstract description 15
- 231100000719 pollutant Toxicity 0.000 abstract description 15
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 9
- 239000002351 wastewater Substances 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 28
- 239000010865 sewage Substances 0.000 description 18
- 235000012255 calcium oxide Nutrition 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 17
- 229920001661 Chitosan Polymers 0.000 description 16
- 230000000694 effects Effects 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 11
- 239000011575 calcium Substances 0.000 description 9
- 229910052804 chromium Inorganic materials 0.000 description 6
- 230000003750 conditioning effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 229910052745 lead Inorganic materials 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 239000000701 coagulant Substances 0.000 description 4
- 239000012065 filter cake Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 230000029087 digestion Effects 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 239000003242 anti bacterial agent Substances 0.000 description 2
- 229940088710 antibiotic agent Drugs 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000009264 composting Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 239000005714 Chitosan hydrochloride Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 description 1
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229920002518 Polyallylamine hydrochloride Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229920006322 acrylamide copolymer Polymers 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000004996 alkyl benzenes Chemical class 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 229930195712 glutamate Natural products 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- PZNOBXVHZYGUEX-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine;hydrochloride Chemical compound Cl.C=CCNCC=C PZNOBXVHZYGUEX-UHFFFAOYSA-N 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 125000001453 quaternary ammonium group Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 239000012258 stirred mixture Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method 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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
-
- 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
- C02F11/004—Sludge detoxification
-
- 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
- C02F11/008—Sludge treatment by fixation or solidification
-
- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- 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
- 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
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/06—Use of additives to fuels or fires for particular purposes for facilitating soot removal
-
- 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
-
- 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
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention belongs to the technical field of environmental protection and solid waste recycling treatment, and discloses a method for preparing a high-heat-value mud cake by using high-water-content organic sludge. Under the stirring condition, sequentially adding a framework structure agent, a flocculation modifier and a flocculating agent into the organic sludge for mixing reaction; the skeleton structure agent consists of CaO, ca (OH) 2 Activated white mud and activated carbon; the flocculation modifier consists of polymeric ferric sulfate and polymeric aluminum sulfate; the flocculant consists of quaternary ammonium salt and polyacrylamide; and then carrying out filter pressing dehydration and low-temperature drying treatment on the treated mixed sludge to obtain a mud cake with high heat value. According to the invention, through designing the skeleton structure agent, the flocculation modifier and the flocculant component and combining a specific treatment sequence, the dehydration efficiency and the low-temperature drying efficiency can be obviously improved, the concentration of heavy metal pollutants and organic pollutants in the waste water after filter pressing is obviously reduced, and the obtained mud cake has the advantages of low water content and high heat value.
Description
Technical Field
The invention belongs to the technical field of environmental protection and solid waste recycling treatment, and particularly relates to a method for preparing a high-heat-value mud cake by using high-water-content organic sludge.
Background
The organic sludge has wide sources and is mainly produced by sewage treatment plants, biological fermentation plants and the like. The method is mainly characterized in that the organic sludge has high organic matter content, is easy to be decomposed and stink, has high water content, and most of organic sludge has a gelatinous structure and is difficult to dehydrate. In addition to a large amount of organic matter, the organic sludge may contain various pathogenic bacteria, parasitic ova, heavy metals, antibiotics, various undegraded toxic and harmful substances, and the like. If the organic sludge is not properly disposed of, various pollutants contained in the organic sludge may cause great harm to the surrounding environment.
The conventional organic sludge treatment methods include digestion, composting, incineration, and dewatering. The digestion method is to decompose part of organic matters in the organic sludge to produce methane by utilizing the endogenous metabolism of aerobic or anaerobic digestion bacteria. The method can reduce the solid content of the sludge and generate available energy sources such as methane. However, the method has the defects of large investment, long reaction time, unobvious sludge reduction and the like, and finally the digested sludge is still difficult to treat. The composting method is a process of degrading a large amount of organic matters in the sludge by microorganisms to make the sludge become an organic fertilizer with good stability. The method has simple process and realizes the recycling of the organic sludge, but toxic and harmful substances such as heavy metals and the like contained in the original organic sludge must be within the national standard range, so the type of the organic sludge treated by the method has great limitation. Sludge incineration is the most thorough treatment method, can greatly reduce the volume of sludge and can completely decompose various toxic and harmful substances in the sludge, but the method also has great energy consumption, and secondary pollutants such as dioxin can be generated when the sludge is not combusted sufficiently. The purpose of sludge dewatering is to remove capillary water and surface adhesion water in the sludge, thereby reducing the volume and the weight thereof. The volume of the dehydrated sludge is reduced to 1/10 or lower of the original volume, which is beneficial to transportation and subsequent treatment. The dewatering method has simple process, no secondary pollutant, low investment and obvious sludge reduction effect, and is a method with further development and application prospect.
The most commonly used sludge dewatering method is mechanical dewatering, but the water content of the sludge can be reduced to about 60% no matter which filter press is used for the sludge with high water content, and the water content is still high. In recent years, a method of combining mechanical dehydration with an additional dehydration agent has been developed. The external dewatering agent generally has flocculation effect, so that small molecular organic matters in the sludge are agglomerated into macromolecular matters and precipitated, and further, high-efficiency solid-liquid separation can be realized under certain conditions. The conventional agent has weak dehydration performance and large addition amount of the agent, and patent CN101693592A discloses a sludge dehydration auxiliary agent, which takes ferrous chloride as a main agent, has simple application, but has large addition amount, and the iron chloride accounts for 8-15% of the weight of the sludge. Patent CN108751667a discloses a conditioning agent for sludge dewatering and an application method thereof, the agent has a small dosage, but complex components, the water content of the sludge after dewatering is still about 70%, and the dewatering assisting effect is limited. Patent CN106746482a discloses a sludge dewatering compound conditioner and a sludge dewatering method, wherein the sludge dewatering compound conditioner comprises an organic coagulant, an inorganic coagulant and an auxiliary agent. The organic coagulant is at least one of polydimethyl diallyl ammonium chloride, dimethyl diallyl ammonium chloride, acrylamide copolymer and polyallylamine hydrochloride; the inorganic coagulant is at least one of aluminum salt and ferric salt; the auxiliary agent is at least one of sodium dodecyl benzene sulfonate, linear alkyl benzene sulfonate, TX-10 emulsifier, chitosan hydrochloride, chitosan quaternary ammonium salt, chitosan lactate, chitosan glutamate and polyvinyl alcohol. The method can reduce the water content of the mud cake to about 60%, the water content is still higher, the structural strength of the mud cake is low, and the filter pressing efficiency and the subsequent low-temperature drying efficiency are not high. Most of sludge dewatering conditioning agents neglect the effect of mechanical properties of sludge, and if the mechanical properties of the sludge are poor, the sludge is deformed during filtration and dewatering, so that capillary structures between the sludge and the sludge are reduced, and the dewatering effect is affected. Therefore, the research and development of the conditioning agent capable of improving the mechanical property of the sludge has high application value.
Patent CN101985386A discloses a conditioner for dewatering domestic sludge and a conditioning method, which are characterized in that polyaluminium sulfate, quicklime and bamboo charcoal are sequentially added into sludge to be treated under normal temperature and normal pressure, polyacrylamide and quaternary ammonium salt are sequentially added after stirring reaction is carried out for at least 5 minutes, stirring is carried out for at least 3 minutes, and finally, press filtration is carried out, wherein the water content of a mud cake after treatment is 40-50%. Although the conditioner can reduce the water content of sludge to 40-50%, the structure strength of mud cakes is low, the requirement on the condition of filter pressing is high, filter cakes are not easy to peel off from filter media, the filter pressing efficiency is low, and the subsequent low-temperature drying efficiency is affected. In addition, the conditioning agent in the conditioning process is unreasonable in selection and addition sequence, so that the water after filter pressing still contains various macromolecular organic pollutants and heavy metal ions, and a large subsequent sewage treatment burden still exists.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the primary purpose of the invention is to provide a method for preparing a high-heat value mud cake by using high-water-content organic sludge.
Another object of the present invention is to provide a high calorific value mud cake prepared by the above method.
It is still another object of the present invention to provide a method for preparing fuel using the Gao Rezhi mudcake described above.
The invention aims at realizing the following technical scheme:
a method for preparing a high-heat-value mud cake by utilizing high-water-content organic sludge comprises the following specific preparation steps:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge for mixing reaction for 5-30 min; the skeleton structure agent consists of CaO, ca (OH) 2 Activated white mud and activated carbon;
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 5-30 min; the flocculation modifier consists of polymeric ferric sulfate and polymeric aluminum sulfate;
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 5-30 min; the flocculant consists of quaternary ammonium salt and polyacrylamide;
(4) Carrying out filter pressing dehydration on the mixed sludge treated in the step (3) to obtain dehydrated sludge;
(5) And (3) carrying out low-temperature drying treatment on the dehydrated sludge obtained in the step (4) to obtain a high-heat-value mud cake.
Further, the water content of the organic sludge in the step (1) is 30% -99%.
Further, in the step (1), the skeleton structure agent comprises the following components in percentage by mass: 30% -50% of CaO, ca (OH) 2 30-40%, active white mud 10-20%, active carbon 10-20%.
Further preferably, the addition amount of the framework structure agent is 0.01-0.02 kg/L of sludge.
Further, in the step (2), the flocculation modifier comprises the following components in percentage by mass: 20-80% of polymeric ferric sulfate and 20-80% of polymeric aluminum sulfate.
Further preferably, the addition amount of the flocculation modifier is 0.01-0.02 kg/L of sludge.
Further, in the step (3), the flocculant comprises the following components in percentage by mass: 40-80% of quaternary ammonium salt and 20-60% of polyacrylamide.
Further preferably, the quaternary ammonium salt is selected from chitosan quaternary ammonium salt, polydimethyldiallyl ammonium chloride or polysiloxane quaternary ammonium salt. More preferably a silicone quaternary ammonium salt. In the sludge dewatering process, polysiloxane quaternary ammonium salt is adopted, so that the sludge dewatering performance is better improved than that of other quaternary ammonium salts.
Further preferably, the addition amount of the flocculant is 0.01-0.02 g/L of sludge.
Further, in the step (4), a plate-and-frame filter press is adopted for filter pressing and dehydration, and the dehydration pressure is 1-2 MPa.
Further, in the step (5), the low-temperature drying treatment is performed until the water content is 15% -25%.
The high-heat-value mud cake is prepared by the method, and the heat value of the high-heat-value mud cake is 3000-4500 kcal/kg.
The method for preparing the fuel by adopting the Gao Rezhi mud cake comprises the following steps of:
uniformly stirring and mixing the high-heat-value mud cake, combustion improver potassium nitrate, catalyst manganese dioxide, desulfurizing agent calcium oxide and heat value improver waste oil, and then performing compression molding to obtain fuel; the fuel comprises the following raw materials in percentage by mass: 50-70% of mud cake with high heat value, 10-30% of potassium nitrate, 3-5% of manganese dioxide, 1-7% of calcium oxide and 10-20% of waste oil.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention utilizes the organic flocculation reagent to promote the flocculation precipitation of a large amount of sludge organic matters, improve the performance of dehydrated sludge, remove most of organic matters in water, quickly realize the reduction of sludge and promote the dehydration of sludge. The addition of the flocculation modifier enables the flocculant to be more direct and act on organic macromolecular colloid particles and dissoluble organic matters with changed structures, thereby achieving the effects of strengthening flocculation precipitation and accelerating filtration.
(2) The invention uses skeleton medicament to improve the mechanical stability of the sludge, can fix pollutants such as heavy metal in the sludge, reduce the environment migration capacity of the sludge, and provides a precondition for harmless treatment of the sludge. Reducing the compressibility coefficient of the sludge. The sludge with high compressibility coefficient can deform under the filtration pressure, so that the capillary tube diameter between the sludge and the sludge is reduced, and water is difficult to pass through. By adding some framework substances into the sludge, the compression performance of the sludge can be improved. These materials act as a skeleton of the mudcake during formation of the mudcake, increasing the structural strength of the mudcake, thereby allowing water to be easily removed from the mudcake, while the filter cake is also easily peeled from the filter media.
(3) According to the invention, through designing the components of the framework structure agent, the flocculation modifier and the flocculant and combining a specific treatment sequence, the dehydration efficiency and the low-temperature drying efficiency can be obviously improved, the concentration of heavy metal pollutants and organic pollutants in the wastewater after filter pressing is obviously reduced, and the subsequent sewage treatment burden is reduced.
(4) The method has remarkable solid-liquid separation effect, and the water after filter pressing hardly contains macromolecular organic matters. Organic sludge with water content higher than a certain value, especially organic waste such as fungus dreg, has low zeta potential, solid-liquid mixture in colloid aggregation form, very stable chemical property, and high treatment cost, and is difficult to flocculate and dewater by a common method. If a general flocculation precipitation method is adopted, the solid-liquid separation effect is not obvious, the wastewater after filter pressing still contains various macromolecular organic pollutants, and the water content of a filter cake is still high. The high-water-content organic sludge treated by the method of the invention basically does not contain macromolecular organic matters, heavy metals, antibiotics and other dangerous pollutants in the sewage after filter pressing, the TOC and COD values are reduced to a great extent, and the water content of the filter cake is low and the heat value is high.
(5) The high-heat-value mud cake obtained by the method can be used for preparing high-heat-value fuel, and has the advantages of low cost, full combustion, no generation of secondary pollutants such as dioxin and the like.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
Example 1
The method for preparing the high-heat-value mud cake by utilizing the high-water-content organic sludge in the embodiment comprises the following preparation steps:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97% for mixing reaction for 20min; the skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon; the adding amount of the framework structure agent is 0.015kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 20min; the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate; the addition amount of the flocculation modifier is 0.015kg/L of sludge.
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 20min; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide; the addition amount of the flocculant is 0.015g/L of sludge.
(4) Press-filtering and dehydrating the mixed sludge treated in the step (3) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is measured to be 42%, the TOC value in the sewage after press filtration is 4.6mg/L, COD value is 48mg/L, and the concentration of the heavy metals detected by the heavy metal content is less than 0.5ppm.
(5) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (4) to obtain a high-heat-value mud cake with the water content of 20%. The mud cake calorific value was 3500kcal/kg.
The method for preparing the fuel by adopting the mud cake with high heat value comprises the following specific steps: and (3) adding 60% of the high-heat-value mud cake obtained in the step (5), 20% of combustion improver potassium nitrate, 4% of catalyst manganese dioxide, 4% of desulfurizing agent calcium oxide and 12% of heat-value lifting agent waste oil into a stirrer according to mass percentage, stirring and mixing uniformly, then putting the uniformly stirred mixture into a compressor, compressing into a cake shape, and forming to obtain the fuel. The fuel calorific value was measured to be 3900kcal/kg.
The high heat value mud cake obtained in the embodiment and the prepared fuel are subjected to combustion test, and the result shows that the high heat value mud cake can be subjected to self-sustaining combustion, but the combustion is insufficient, a large amount of smoke dust is generated, and the concentration of dioxin is detected to be 26.6ng TEQ/m 3 . The obtained fuel is fully combusted, almost no smoke dust is generated, and no dioxin secondary pollutant is detected. The high-heat-value mud cake obtained by the invention is prepared into fuel by the combustion improver, the catalyst manganese dioxide, the desulfurizing agent calcium oxide and the heat value improver, and the combustion performance of the mud cake can be obviously improved.
Example 2
The method for preparing the high-heat-value mud cake by utilizing the high-water-content organic sludge in the embodiment comprises the following preparation steps:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97%, and mixing and reacting for 10min; the skeleton structure agent consists of 30% of CaO and 30% of Ca (OH) 2 20% of active white mud and 20% of active carbon; the adding amount of the framework structure agent is 0.02kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 10min; the flocculation modifier consists of 80% of polymeric ferric sulfate and 20% of polymeric aluminum sulfate; the addition amount of the flocculation modifier is 0.02kg/L of sludge.
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 10min; the flocculant consists of 80% of chitosan quaternary ammonium salt and 20% of polyacrylamide; the addition amount of the flocculant is 0.02g/L of sludge.
(4) Press-filtering and dehydrating the mixed sludge treated in the step (3) by adopting a plate-and-frame filter press under the pressure of 1.6MPa to obtain dehydrated sludge; the water content of the dehydrated sludge is measured to be 50%, the TOC value in the sewage after press filtration is 4.7mg/L, COD value is 43mg/L, and the concentration of the heavy metals detected by the heavy metal content is less than 0.5ppm.
(5) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (4) to obtain a high-heat-value sludge cake with the water content of 23%. The mud cake calorific value was measured to be 3200kcal/kg.
Example 3
The method for preparing the high-heat-value mud cake by utilizing the high-water-content organic sludge in the embodiment comprises the following preparation steps:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97% for mixing reaction for 30min; the skeleton structure agent consists of 40% of CaO and 40% of Ca (OH) 2 10% of active white mud and 10% of active carbon; the adding amount of the framework structure agent is 0.01kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 30min; the flocculation modifier consists of 20% of polymeric ferric sulfate and 80% of polymeric aluminum sulfate; the addition amount of the flocculation modifier is 0.01kg/L of sludge.
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 30min; the flocculant consists of 40% of chitosan quaternary ammonium salt and 60% of polyacrylamide; the addition amount of the flocculant is 0.01g/L of sludge.
(4) Press-filtering and dehydrating the mixed sludge treated in the step (3) by adopting a plate-and-frame filter press under the pressure of 1.6MPa to obtain dehydrated sludge; the water content of the dehydrated sludge is measured to be 45%, the TOC value in the sewage after press filtration is 4.2mg/L, COD value is 41mg/L, and the concentration of the heavy metals detected by the heavy metal content is less than 0.5ppm.
(5) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (4) to obtain a high-heat-value sludge cake with the water content of 18%. The mud cake calorific value was 3800kcal/kg.
Example 4
In this example, compared with example 2, the quaternary ammonium salt component in the flocculant is polydimethyldiallyl ammonium chloride instead of chitosan quaternary ammonium salt, and the rest are the same.
The water content of the dehydrated sludge treated by the embodiment is 51%, the TOC value in the sewage after press filtration is 4.8mg/L, COD value is 50mg/L, and the concentration of the heavy metals detected by the heavy metal content is less than 0.5ppm.
The dehydrated sludge treated in this example was further subjected to low-temperature drying treatment (65 ℃ C., 2 hours) to obtain dried sludge having a water content of 22%. The mud cake calorific value was 3400kcal/kg.
Example 5
In this example, compared with example 2, the quaternary ammonium salt component in the flocculant is polysiloxane quaternary ammonium salt-16 instead of chitosan quaternary ammonium salt, and the rest are the same.
The water content of the dehydrated sludge treated by the embodiment is 40%, the TOC value in the sewage after press filtration is 4.3mg/L, COD value is 39mg/L, and the concentration of the heavy metals detected by the heavy metal content is less than 0.5ppm.
The dehydrated sludge treated in the embodiment is further subjected to low-temperature drying treatment (65 ℃ for 1 h) to obtain the dried sludge with the water content of 17%. The mud cake calorific value was measured to be 4100kcal/kg.
The results of examples 1 to 5 show that the quaternary ammonium salt component in the flocculant adopts polysiloxane quaternary ammonium salt, so that the performance of improving sludge dewatering is better than that of other quaternary ammonium salts, the water content of dewatered sludge is further obviously reduced, the low-temperature drying efficiency of the subsequent dewatered sludge is improved by more than one time, and the flocculation effect on organic matters is not obviously reduced. The reason for this may be that the low surface tension property of the polysiloxane in the polysiloxane quaternary ammonium salt can reduce interfacial tension between solid and liquid, so that moisture contained in the sludge floc grid is released, thereby facilitating deep removal of moisture in the sludge, and further improving sludge dewatering efficiency and low-temperature drying efficiency. Meanwhile, due to the reduction of interfacial tension, the shearing resistance and rheological property of the sludge flocs are reduced, so that the conditioner components are easier to mix and react with the sludge, the utilization rate of the conditioner is obviously improved, and a better dewatering effect is achieved.
Comparative example 1
Compared with the example 1, the preparation process does not add a framework structural agent for reaction, and the specific steps are as follows:
(1) Adding a flocculation modifier into the organic sludge with the water content of 97% under the stirring condition, and continuously stirring and mixing for reaction for 30min; the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate; the addition amount of the flocculation modifier is 0.015kg/L of sludge.
(2) Adding a flocculating agent into the reaction mixture in the step (1), and continuously stirring and mixing for reaction for 30min; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide; the addition amount of the flocculant is 0.015g/L of sludge.
(3) Press-filtering and dehydrating the mixed sludge treated in the step (2) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is 78%, the TOC value in the sewage after press filtration is 42mg/L, COD value is 389mg/L, and the concentration of heavy metal content detection Cr, as and Pb is 2.0ppm, 1.3ppm and 1.7ppm respectively.
(4) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (3) to obtain a mud cake with the water content of 62%. The mud cake calorific value was measured to be 750kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, the framework structure agent provided by the invention is used as a framework of the mud cake to increase the structural strength of the mud cake, so that water is easy to remove from the mud cake, the solid-liquid separation effect is obvious, and the low-temperature drying efficiency is improved. The content of water organic matters after filter pressing is obviously reduced, and the calorific value of mud cakes is obviously improved. And can fix pollutants such as heavy metals in the sludge to a certain extent, and reduce the environment migration capacity of the sludge.
Comparative example 2
Compared with the example 1, the flocculation modifier is not added in the preparation process, and the specific steps are as follows:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97% for mixing reaction for 30min; the framework structure agent consists of 40 percent of CaO and 30 percent ofCa(OH) 2 15% of active white mud and 15% of active carbon; the adding amount of the framework structure agent is 0.015kg/L of sludge.
(2) Adding a flocculating agent into the mixed material in the step (1), and continuously stirring and mixing for reaction for 30min; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide; the addition amount of the flocculant is 0.015g/L of sludge.
(3) Press-filtering and dehydrating the mixed sludge treated in the step (2) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is 64%, the TOC value in the sewage after press filtration is 22mg/L, COD value is 237mg/L, and the concentration of heavy metal content detection Cr, as and Pb is 0.6ppm, 0.8ppm and 1.1ppm respectively.
(4) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (3) to obtain a mud cake with the water content of 48%. The mud cake calorific value was found to be 1700kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, the flocculation modifier provided by the invention has the effects of strengthening flocculation precipitation, reducing the organic matter content in sewage after filter pressing, strengthening filtration and improving low-temperature drying efficiency, and obviously improves the heat value of mud cakes.
Comparative example 3
In this comparative example, compared to example 1, the preparation process was carried out without adding flocculant, and the specific steps were as follows:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97% for mixing reaction for 30min; the skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon; the adding amount of the framework structure agent is 0.015kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 30min; the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate; the addition amount of the flocculation modifier is 0.015kg/L of sludge.
(3) Press-filtering and dehydrating the mixed sludge treated in the step (2) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is measured to be 74%, the TOC value in the sewage after press filtration is 31mg/L, COD value is 420mg/L, and the concentration of heavy metal content detection Cr, as and Pb is respectively 0.5ppm, 0.7ppm and 0.8ppm.
(4) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (3) to obtain a mud cake with the water content of 60%. The mud cake calorific value was measured to be 800kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, the flocculant provided by the invention has the advantages of improving the dehydration performance of the sludge, promoting the dehydration of the sludge, rapidly realizing the reduction of the sludge, removing most of organic matters in the water and obviously improving the heat value of mud cakes.
Comparative example 4
In comparison with example 1, the preparation process comprises the following steps of:
(1) Under the stirring condition, the framework structure agent, the flocculation modifier and the flocculant are added into the organic sludge with the water content of 97 percent at one time to be mixed and reacted for 60 minutes. The skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon, wherein the adding amount of the framework structure agent is 0.015kg/L of sludge; the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate, and the addition amount of the flocculation modifier is 0.015kg/L of sludge; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide, and the addition amount of the flocculant is 0.015g/L of sludge.
(2) And (3) carrying out filter pressing dehydration on the mixed sludge treated in the step (1) by adopting a plate-and-frame filter press under the pressure of 1.6MPa to obtain dehydrated sludge.
The water content of the dehydrated sludge is 63%, the TOC value in the sewage after press filtration is 20mg/L, COD value is 198mg/L, and the concentration of heavy metals detected by the heavy metal content is 1.5ppm, 1.1ppm and 1.4ppm respectively.
(3) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (2) to obtain a mud cake with the water content of 45%. The mud cake calorific value was measured to be 1500kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, compared with the method of adding each conditioner at one time, the method of the invention has the advantages that the dehydration efficiency and the low-temperature drying efficiency can be obviously improved by firstly adding the skeleton structure agent for reaction and then sequentially adding the flocculation modifier for reaction and the flocculating agent for reaction, the concentration of heavy metal pollutants and organic pollutants in the waste water after filter pressing is obviously reduced, and the heat value of mud cakes is obviously improved.
Comparative example 5
Compared with the example 1, the preparation process comprises the steps of firstly adding a framework structure agent for reaction, and then adding a flocculation modifier and a flocculant for reaction at one time, wherein the specific steps are as follows:
(1) Under the stirring condition, adding a framework structure agent into the organic sludge with the water content of 97% for mixing reaction for 20min; the skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon; the adding amount of the framework structure agent is 0.015kg/L of sludge.
(2) Adding a flocculation modifier and a flocculating agent into the mixed material in the step (1) at one time, wherein the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate, and the adding amount of the flocculation modifier is 0.015kg/L of sludge; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide; the addition amount of the flocculant is 0.015g/L of sludge; the stirring and mixing reaction was continued for 40min.
(3) Press-filtering and dehydrating the mixed sludge treated in the step (2) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is 64%, the TOC value in the sewage after press filtration is 11mg/L, COD value is 124mg/L, and the concentration of heavy metal content detection Cr, as and Pb is 0.8ppm, 0.7ppm and 0.9ppm respectively.
(4) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (3) to obtain a mud cake with the water content of 38%. The mud cake calorific value was found to be 2200kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, compared with the reaction by adding the flocculation modifier and the flocculant in batches, the one-time addition of the flocculation modifier and the flocculant for reaction can remarkably improve the dehydration efficiency and the low-temperature drying efficiency, remarkably reduce the concentration of heavy metal pollutants and organic pollutants in the wastewater after the filter pressing and remarkably improve the calorific value of mud cakes.
Comparative example 6
Compared with the example 1, the preparation process comprises the steps of firstly adding the skeleton structure agent and the flocculation modifier for reaction at one time, and then adding the flocculant for reaction, wherein the specific steps are as follows:
(1) Under the stirring condition, adding a framework structure agent and a flocculation modifier into the organic sludge with the water content of 97% at one time, and mixing and reacting for 40min; the skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon, wherein the adding amount of the framework structure agent is 0.015kg/L of sludge; the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate, and the adding amount of the flocculation modifier is 0.015kg/L of sludge.
(2) Adding a flocculating agent into the mixed material in the step (1), and continuously stirring and mixing for reacting for 20min; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide; the addition amount of the flocculant is 0.015g/L of sludge.
(3) Press-filtering and dehydrating the mixed sludge treated in the step (2) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is measured to be 62%, the TOC value in the sewage after press filtration is 9mg/L, COD value is 105mg/L, and the concentration of heavy metal content detection Cr, as and Pb is respectively 0.5ppm, 0.6ppm and 1.0ppm.
(4) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (3) to obtain a mud cake with the water content of 35%. The mud cake calorific value was measured to be 2600kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, compared with the reaction by adding the skeleton structure agent and the flocculation modifier in batches, the one-time addition of the skeleton structure agent and the flocculation modifier for reaction can remarkably improve the dehydration efficiency and the low-temperature drying efficiency, remarkably reduce the concentration of heavy metal pollutants and organic pollutants in the wastewater after the filter pressing and remarkably improve the heat value of mud cakes.
Comparative example 7
Compared with the example 1, the preparation process comprises the steps of firstly adding the skeleton structure agent and the flocculating agent for reaction at one time, and then adding the flocculation modifier for reaction, wherein the specific steps are as follows:
(1) Under the stirring condition, adding a framework structure agent and a flocculating agent into the organic sludge with the water content of 97% at one time, and mixing and reacting for 40min; the skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon, wherein the adding amount of the framework structure agent is 0.015kg/L of sludge; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide, and the adding amount of the flocculant is 0.015kg/L of sludge.
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 20min; the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate; the addition amount of the flocculation modifier is 0.015g/L of sludge.
(3) Press-filtering and dehydrating the mixed sludge treated in the step (2) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is 76%, the TOC value in the sewage after press filtration is 35mg/L, COD value is 407mg/L, and the concentration of heavy metal content detection Cr, as and Pb is 0.6ppm, 0.8ppm and 1.1ppm respectively.
(4) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (3) to obtain a mud cake with the water content of 61%. The mud cake calorific value was measured to be 850kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, compared with the method that the framework structure agent and the flocculating agent are firstly added for reaction at one time and then the flocculation modifier is added for reaction, the method can obviously improve the dehydration efficiency and the low-temperature drying efficiency by firstly adding the framework structure agent for reaction and then sequentially adding the flocculation modifier for reaction and the flocculating agent for reaction, obviously reduce the concentration of heavy metal pollutants and organic pollutants in the waste water after filter pressing, and obviously improve the calorific value of mud cakes.
Comparative example 8
Compared with the example 1, the preparation process comprises the steps of firstly adding a flocculation modifier to react with a flocculant at one time, and then adding a framework structure agent to react, wherein the specific steps are as follows:
(1) Under the stirring condition, adding a flocculation modifier and a flocculating agent into the organic sludge with the water content of 97 percent at one time, stirring and mixing for reacting for 40 minutes; the flocculation modifier consists of 50% of polymeric ferric sulfate and 50% of polymeric aluminum sulfate, and the adding amount of the flocculation modifier is 0.015kg/L of sludge; the flocculant consists of 60% of chitosan quaternary ammonium salt and 40% of polyacrylamide; the addition amount of the flocculant is 0.015g/L of sludge.
(2) Adding a framework structure agent into the mixed material in the step (1) for mixing reaction for 20min; the skeleton structure agent consists of 40% of CaO and 30% of Ca (OH) 2 15% of active white mud and 15% of active carbon; the adding amount of the framework structure agent is 0.015kg/L of sludge.
(3) Press-filtering and dehydrating the mixed sludge treated in the step (2) by adopting a plate-and-frame filter press under the pressure of 1.6MPa (until no obvious free water is removed), so as to obtain dehydrated sludge; the water content of the dehydrated sludge is measured to be 72%, the TOC value in the sewage after press filtration is measured to be 28mg/L, COD and 327mg/L, and the concentration of heavy metals detected by the heavy metal content is measured to be 1.1ppm, 0.8ppm and 0.9ppm respectively.
(4) And (3) carrying out low-temperature drying treatment (65 ℃ for 2 hours) on the dehydrated sludge obtained in the step (3) to obtain a mud cake with the water content of 54%. The mud cake calorific value was measured to be 1200kcal/kg.
As can be seen from the comparison result of the comparative example and the example 1, the invention can obviously improve the dehydration efficiency and the low-temperature drying efficiency by firstly adding the framework structural agent for reaction and then sequentially adding the flocculation modifier for reaction and the flocculant for reaction, and compared with the mode of firstly adding the flocculation modifier for reaction and then adding the framework structural agent for reaction, the invention can obviously reduce the concentration of heavy metal pollutants and organic pollutants in the waste water after filter pressing and obviously improve the heat value of mud cakes.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (6)
1. A method for preparing a high-heat-value mud cake by utilizing high-water-content organic sludge is characterized by comprising the following specific preparation steps:
(1) Under the stirring condition, adding a framework structural agent into the organic sludge for mixing reaction for 5-30 min; the skeleton structure agent consists of CaO, ca (OH) 2 Activated white mud and activated carbon;
(2) Adding a flocculation modifier into the mixed material in the step (1), and continuously stirring and mixing for reaction for 5-30 min; the flocculation modifier consists of polymeric ferric sulfate and polymeric aluminum sulfate;
(3) Adding a flocculating agent into the reaction mixture in the step (2), and continuously stirring and mixing for reaction for 5-30 min; the flocculant consists of quaternary ammonium salt and polyacrylamide;
(4) Carrying out filter pressing dehydration on the mixed sludge treated in the step (3) to obtain dehydrated sludge;
(5) Drying the dehydrated sludge obtained in the step (4) at low temperature to obtain a high-heat-value mud cake;
the skeleton structure agent in the step (1) comprises the following components in percentage by mass: caO 30% -50%, ca (OH) 2 30-40%, 10-20% of activated white mud and 10-20% of activated carbon; the adding amount of the framework structure agent is 0.01-0.02 kg/L of sludge;
the flocculation modifier in the step (2) comprises the following components in percentage by mass: 20-80% of polymeric ferric sulfate and 20-80% of polymeric aluminum sulfate; the addition amount of the flocculation modifier is 0.01-0.02 kg/L of sludge;
the flocculant in the step (3) comprises the following components in percentage by mass: 40% -80% of quaternary ammonium salt, 20% -60% of polyacrylamide, wherein the quaternary ammonium salt is polysiloxane quaternary ammonium salt; the adding amount of the flocculant is 0.01-0.02 g/L of sludge.
2. The method for preparing a high-heat-value mud cake by using high-water-content organic sludge according to claim 1, wherein the water content of the organic sludge in the step (1) is 30% -99%.
3. The method for preparing the high-heat-value mud cake by utilizing the high-water-content organic sludge, which is disclosed in claim 1, is characterized in that in the step (4), a plate-and-frame filter press is adopted for filter pressing and dehydration, and the dehydration pressure is 1-2 MPa.
4. The method for preparing a high-heat-value mud cake by using high-water-content organic sludge, which is characterized in that the low-temperature drying treatment in the step (5) is carried out until the water content is 15% -25%.
5. A high calorific value mud cake, characterized in that it is prepared by the method of any one of claims 1 to 4, and has a calorific value of 3000 to 4500kcal/kg.
6. A method for preparing fuel using the high calorific value mudcake of claim 5, comprising the steps of:
uniformly stirring and mixing the high-heat-value mud cake, combustion improver potassium nitrate, catalyst manganese dioxide, desulfurizing agent calcium oxide and heat value improver waste oil, and then performing compression molding to obtain fuel; the fuel comprises the following raw materials in percentage by mass: 50-70% of mud cake with high heat value, 10-30% of potassium nitrate, 3-5% of manganese dioxide, 1-7% of calcium oxide and 10-20% of waste oil.
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