CN102557367A - Method for recycling and safely disposing aluminum-salt containing coagulated sludge - Google Patents
Method for recycling and safely disposing aluminum-salt containing coagulated sludge Download PDFInfo
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- CN102557367A CN102557367A CN2012100228362A CN201210022836A CN102557367A CN 102557367 A CN102557367 A CN 102557367A CN 2012100228362 A CN2012100228362 A CN 2012100228362A CN 201210022836 A CN201210022836 A CN 201210022836A CN 102557367 A CN102557367 A CN 102557367A
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- 239000010802 sludge Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004064 recycling Methods 0.000 title claims abstract description 15
- 238000004043 dyeing Methods 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 17
- 239000003818 cinder Substances 0.000 claims abstract description 16
- 230000002378 acidificating effect Effects 0.000 claims abstract description 15
- 239000000440 bentonite Substances 0.000 claims abstract description 15
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 15
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 14
- 238000002386 leaching Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000007639 printing Methods 0.000 claims description 47
- 239000010865 sewage Substances 0.000 claims description 42
- 238000001723 curing Methods 0.000 claims description 27
- 159000000013 aluminium salts Chemical class 0.000 claims description 23
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 20
- 229910001385 heavy metal Inorganic materials 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 15
- 230000001112 coagulating effect Effects 0.000 claims description 13
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 150000004645 aluminates Chemical class 0.000 claims description 12
- 238000012423 maintenance Methods 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000004753 textile Substances 0.000 abstract 7
- 239000003344 environmental pollutant Substances 0.000 abstract 4
- 231100000719 pollutant Toxicity 0.000 abstract 4
- 235000003891 ferrous sulphate Nutrition 0.000 abstract 1
- 239000011790 ferrous sulphate Substances 0.000 abstract 1
- -1 heptahydrate ferrous sulfate Chemical class 0.000 abstract 1
- 238000010169 landfilling Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- 230000001988 toxicity Effects 0.000 description 11
- 231100000419 toxicity Toxicity 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000009616 inductively coupled plasma Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000002920 hazardous waste Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 231100000820 toxicity test Toxicity 0.000 description 3
- 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 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The invention provides a method for recycling and safely disposing aluminum-salt containing coagulated sludge, comprising the following steps: recycling aluminum-salt containing textile dyeing sludge by adopting the acid leaching process, concentrating the aluminum-salt containing textile dyeing sludge under the force of gravity, pumping the aluminum-salt containing textile dyeing sludge into a sludge treating pool for treating, adding 0.5mol/L sulfuric acid, fully mixing to make the aluminum-salt containing textile dyeing sludge and the sulfuric acid react until the sludge and the water are layered, dewatering by using a centrifugal machine, recycling the recovered aluminum salt, adding acidic bentonite and heptahydrate ferrous sulfate, adding cement serving as the curing agent, fly ash and cinder into the separated textile dyeing sludge to cure the textile dyeing sludge, curing and maintaining the textile dyeing sludge, and landfilling sanitarily. The method has the advantages that pollutants can be sealed, the emission of pollutants can be reduced to the maximum extent, the physical and mechanical properties and the operating performance of the pollutants can be improved, the solubility of pollutants can be reduced, the recycling and the regeneration of the aluminum salt in the coagulated sludge is realized, the addition amount of the aluminum salt is reduced, and the aluminum-salt containing coagulated sludge can be recycled and disposed harmlessly. In addition, the method can be operated on site and has low cost.
Description
Technical field
The present invention relates to a kind of resource utilization and safe disposal method of aluminate coagulating mud, this method is applicable to the innoxious and recycling treatment of the aluminate coagulating mud that produces with the aluminum salt processing in the dyeing waste water.
Background technology
Printing and dyeing sludge is owing to contain dyestuff, slurry, auxiliary agent etc., and composition is very complicated, and wherein the structure of dyestuff has heavy metal elements such as nitro and aminocompound and copper, chromium, zinc, arsenic, has bigger bio-toxicity, and is very strong to the pollution of environment.The method of sludge disposal mainly contains landfill, burns, fills out sea and recycling at present.Printing and dyeing sludge after the dehydration owing to wherein contain a large amount of heavy metal ion and some other chemical agent, so and be not suitable for agricultural and soil utilization, in general can only carry out sanitary landfill and handle.
Printing and dyeing sludge belongs to high-moisture percentage (75%～85%), high organic, the very poor meta-alkalescence material of soil mechanical properties, and printing and dyeing sludge is with after rainwater mixes, and organicly flows out with percolate, follow-up percolate is handled caused disadvantageous effect.Aluminium salt in the printing and dyeing sludge mainly comes from adding of aluminum salt in the sewage treatment process.In with the process of aluminium salt, certainly lead to a large amount of aluminum chemistry mud that contain as coagulating agent.At present, generally be to carry out landfill for the treatment process of this printing and dyeing sludge, this kind method of disposal is easy generation of secondary pollution not only, and the landfill yard soil also is difficult for obtaining from now on.As far back as the seventies in 20th century, mud acidification technology has been applied to American market, and also there is application in Japan.Acidization reclaims the aluminium salt in the water purification mud; Not only can significantly reduce the quantity discharged of sewage sludge solid; The aluminum salt that reclaims can continue to be applied to the coagulating treatment process of trade effluent through regenerating, thereby utilization has very important significance to resources effective.Yet because the large usage quantity of acid receives certain restriction in the application.
Thereby must carry out the landfill of to march into the arena after stable curing is handled to the printing and dyeing sludge that contains aluminium salt.The stable curing method is a kind of cheapness, feasible sludge treatment technology; Can reduce the mud flowability, improve sludge intensity, stablize in the mud pollutent such as heavy metal; It not only can be used as the pretreatment process of mud sanitary landfill, ultimate disposal and utilization, and the solidified sludge bulking also can transfer soil material to and carries out resource utilization and utilize.
Summary of the invention
The objective of the invention is to deficiency to prior art; A kind of resource utilization and stable curing method that contains aluminate coagulating mud is provided; Realize recycling of aluminium salt; Reduce murder by poisoning pollutents such as holding a large amount of organic pollutants of containing and heavy metal in the aluminate coagulating mud, thereby make mud can satisfy the requirement of landfill yard landfill, and improve the environmental quality of sludge landfill.
The stable curing method of aluminate coagulating mud of the present invention is characterized in that this method comprises following operation steps:
(1) with acid leaching process aluminium salt printing and dyeing sludge is carried out recycling treatment, concrete grammar is the printing and dyeing sludge that contains aluminium salt to be pumped in the sludge treatment pond handle, and it is carried out gravity concentrate; To reduce the water ratio of mud; Dwindle the volume of mud, add the sulfuric acid that concentration is 0.5mol/L again, make the pH value of printing and dyeing sludge reach 3; Thorough mixing reacts to the muddy water layering; The aluminium salt recovery in the sewage of upper strata reaches more than 80%, adopts the mud after whizzer is carried acidleach to dewater, and separates in upper strata sewage to the other treating pond;
(2) with adding cement, flyash and cinder in the printing and dyeing sludge after separating in the step (1) as solidifying agent; The formation flco stirs; To solidify printing and dyeing sludge; Reduce heavy metal and COD concentration in the mud printing and dyeing leach liquor, the mass ratio of above-mentioned materials is a printing and dyeing sludge 1: cement 0.1～0.3: flyash 0.1～0.2: cinder 0.1～0.35;
(3) after stirring finishes above-mentioned mud is cleaned out the sludge treatment pond, place the square mould, divide three times filler, each filler must can carry out the filler second time, the demoulding in 24 hours after the mud moulding, the In Shade continuation maintenance of cured block after ram-jolt and compacting;
(4) Acidic Bentonite is ground into the 300-500 order; Input is from step (1) in the isolated sewage; Stir and it was mixed fully in 15 minutes, remove wherein solubility COD, the mass ratio of the Acidic Bentonite consumption of sewage and input is 1000: 1～1000: 10;
(5) in step (4), add an amount of iron vitriol in the sewage after the processing; Stir and it was dissolved fully in 15 minutes; The water quality of further purifying waste water, the mass ratio of the sewage after the processing and the iron vitriol of adding is 1000: 1, discharges the sewage after purifying treatment afterwards;
(6) treat that sludge curing piece maintenance in the step (2) after 5-7 days, carries out sanitary landfill to it.
Further, the mass ratio of each moity is a printing and dyeing sludge 1 in the step of this stable curing method (2): cement 0.2: flyash 0.15: cinder 0.2.
Further, the mass ratio of the Acidic Bentonite consumption of sewage and input is 1000: 5 in the step of this stable curing method (4).
Further, the curing time of sludge curing piece is 6 days in the step of this stable curing method (6).
Concentrating is in order to reduce the water ratio of mud, to dwindle the volume of mud, and adding concentration is the sulfuric acid of 0.5mol/L; It not only regulates pH, but also sulfate ion is provided, make it with printing and dyeing sludge in the aluminium composition be combined into the flocculation agent of solubility aluminum sulfate salt; Thereby reach the Tai-Ace S 150 that the aluminium composition that makes in the mud is converted into solubility; Thereby separate with mud, and to add the vitriol oil be thermopositive reaction, help aluminium stripping reaction; Aluminium salt recyclable regenerative after the stripping utilizes, so the present invention is preferably, and to add concentration be the sulfuric acid of 0.5mol/L.Through dehydration, can further dwindle the volume of mud.
Solidification and stabilization method is a kind of cheapness, feasible sludge treatment technology; Can reduce the mud flowability, improve sludge intensity, stablize in the mud pollutent such as heavy metal; It not only can be used as the pretreatment process of mud sanitary landfill, ultimate disposal and utilization, and the solidified sludge bulking also can transfer soil material to and carries out resource utilization and utilize.
Cement has good solidification effect to printing and dyeing sludge, the Ca (OH) that its hydration reaction produces
2, hydraulicity material such as ettringite and hydrated calcium silicate, make cured product have good mechanical property.But when utilizing cement treated to contain the mud of a large amount of organic pollutants, organic pollutant has hindered the hydration reaction of cement, solidification effect has been received seriously influence, as delay time of coagulation, intensity form to lag behind the Stability Failure of pollutent etc.The sludge curing piece has strong basicity simultaneously, and it contacts the water quality that can endanger the ecosystem with water body.
Can reduce above-mentioned disadvantageous effect and in treating processes, add other curing subsidiary material.Flyash and cinder are formed the novel solidifying agent mud of solidification treatment municipal sewage plant effectively as solidifying subsidiary material with cement.Flyash is that a kind of that coal dust forms behind high-temp combustion has mineral ion commutativity and adsorption and decoloration like pozzolana mixed material, can adsorb the pollution substance in the mud to a certain extent.SiO in flyash and the cinder
2And Al
2O
3Composition has activity under the excitation of alkali, generate the ettringite class material of silicates, and cured block intensity is increased.
It is low to utilize Acidic Bentonite to carry out cost of sewage disposal, and absorption is strong with flocculation ability, and the settling time is shorter.PH value in the iron vitriol adjustable alkaline water of suitable amounts organically combines with suspended substance in the water, and accelerate precipitation, purifies water.Through test of many times, the mass ratio of the sewage after the processing and the iron vitriol of adding is 1000: 5 among the present invention, can either guarantee the effect that purifies water to prevent to produce too much deposition again, influences the water treatment effect.Add Acidic Bentonite and iron vitriol sewage is handled, make its allow compliance with emission standards, avoid contaminate environment.
The stable curing method of this aluminate coagulating mud is handled printing and dyeing sludge through interpolation cement, flyash, cinder as solidifying agent; Formed cured block has the better physical mechanical property; Ultimate compression strength is 330kPa, and water ratio all remains on 44.6%, meets the landfill disposal requirement.Heavy metal and COD concentration are compared before solidifying in the mud leach liquor after curing simultaneously is stable; All have largely and reduce; Leaching toxicity in curing back satisfies national standard " the Hazardous wastes judging standard leaches toxicity and differentiates ", and (GB5085.3-2007), solidifying agent has fixed action preferably to pollutent such as heavy metal and COD in the mud.
The invention has the beneficial effects as follows: can seal pollutent, farthest reduce the release of pollutent, and improve the physico-mechanical properties and the processing property of refuse; Reduce the solubility of pollutent; Execute-in-place is feasible, and cost is low, realizes the recycling of aluminium salt in the coagulate sludge simultaneously; Reduce the dosage of aluminium salt, realize the innoxious and recycling treatment of aluminate coagulating mud synchronously.
Embodiment
Below by concrete embodiment technical scheme of the present invention is described further.Following examples do not constitute qualification of the present invention.
Embodiment 1
(1) with acid leaching process aluminium salt printing and dyeing sludge is carried out recycling treatment, concrete grammar is the printing and dyeing sludge that contains aluminium salt to be pumped in the sludge treatment pond handle, and it is carried out gravity concentrate; To reduce the water ratio of mud; Dwindle the volume of mud, add the sulfuric acid that concentration is 0.5mol/L again, make the pH value of printing and dyeing sludge reach 3; Thorough mixing reacts to the muddy water layering; The aluminium salt recovery in the sewage of upper strata reaches 80～90%, adopts whizzer that it is dewatered, and separates in upper strata sewage to the other treating pond;
(2) with adding cement, flyash and cinder in the printing and dyeing sludge after separating in the step (1) as solidifying agent; The formation flco stirs; To solidify printing and dyeing sludge; Reduce heavy metal and COD concentration in the mud printing and dyeing leach liquor, the mass ratio of above-mentioned materials is a printing and dyeing sludge 1: cement 0.1: flyash 0.1: cinder 0.1;
(3) after stirring finishes above-mentioned mud is cleaned out the sludge treatment pond, place the square mould, divide three times filler, each filler must can carry out the filler second time, the demoulding in 24 hours after the mud moulding, the In Shade continuation maintenance of cured block after ram-jolt and compacting;
(4) Acidic Bentonite is ground into 300 orders, drops into from step (1) in the isolated sewage, stir and it was mixed fully in 15 minutes, remove wherein solubility COD, the mass ratio of the Acidic Bentonite consumption of sewage and input is 1000: 1;
(5) in step (4), add an amount of iron vitriol in the sewage after the processing; Stir and it was dissolved fully in 15 minutes; The water quality of further purifying waste water, the mass ratio of the sewage after the processing and the iron vitriol of adding is 1000: 1, discharges the sewage after purifying treatment afterwards; Its complete allow compliance with emission standards can not have a negative impact to surrounding environment;
(6) treat that sludge curing piece maintenance in the step (2) after 5 days, carries out sanitary landfill to it.
(GB/T5086.2-1997) carry out stabilization front and back mud according to " solid waste leaches the horizontal succusion of toxicity leaching method " and leach toxicity test; The heavy metal concentration and the rapid sealing degestion that adopt ICP (inductively coupled plasma emmission spectrum) to measure in the leach liquor are measured COD concentration in the leach liquor; Test-results is seen table 1, solidifies back leaching toxicity and satisfies national standard " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB5085.3-2007).
COD and heavy metal concentration (mg/L) in table 1 leach liquor
Annotate: L is not for detecting, and B is GB/T5086.2-1997.
Adopt pressure testing machine to measure cured block ultimate compression strength, the result sees table 2, meets landfill disposal and requires (landfill disposal＞50kPa, banket processing＞100kPa) of building.
Table 2 cured block ultimate compression strength
Embodiment 2
(1) with acid leaching process aluminium salt printing and dyeing sludge is carried out recycling treatment, concrete grammar is the printing and dyeing sludge that contains aluminium salt to be pumped in the sludge treatment pond handle, and it is carried out gravity concentrate; To reduce the water ratio of mud; Dwindle the volume of mud, add the sulfuric acid that concentration is 0.5mol/L again, make the pH value of printing and dyeing sludge reach 3; Thorough mixing reacts to the muddy water layering; The aluminium salt recovery in the sewage of upper strata reaches 80～97%, adopts whizzer that it is dewatered, and separates in upper strata sewage to the other treating pond;
(2) with adding cement, flyash and cinder in the printing and dyeing sludge after separating in the step (1) as solidifying agent; The formation flco stirs; To solidify printing and dyeing sludge; Reduce heavy metal and COD concentration in the mud printing and dyeing leach liquor, the mass ratio of above-mentioned materials is a printing and dyeing sludge 1: cement 0.2: flyash 0.15: cinder 0.2;
(3) after stirring finishes above-mentioned mud is cleaned out the sludge treatment pond, place the square mould, divide three times filler, each filler must can carry out the filler second time, the demoulding in 24 hours after the mud moulding, the In Shade continuation maintenance of cured block after ram-jolt and compacting;
(4) Acidic Bentonite is ground into 400 orders, drops into from step (1) in the isolated sewage, stir and it was mixed fully in 15 minutes, remove wherein solubility COD, the mass ratio of the Acidic Bentonite consumption of sewage and input is 1000: 5;
(5) in step (4), add an amount of iron vitriol in the sewage after the processing; Stir and it was dissolved fully in 15 minutes; The water quality of further purifying waste water, the mass ratio of the sewage after the processing and the iron vitriol of adding is 1000: 1, discharges the sewage after purifying treatment afterwards; Its complete allow compliance with emission standards can not have a negative impact to surrounding environment;
(6) treat that sludge curing piece maintenance in the step (2) after 6 days, carries out sanitary landfill to it.
(GB/T5086.2-1997) carry out stabilization front and back mud according to " solid waste leaches the horizontal succusion of toxicity leaching method " and leach toxicity test; The heavy metal concentration and the rapid sealing degestion that adopt ICP (inductively coupled plasma emmission spectrum) to measure in the leach liquor are measured COD concentration in the leach liquor; Test-results is seen table 3, solidifies back leaching toxicity and satisfies national standard " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB5085.3-2007).
COD and heavy metal concentration (mg/L) in table 3 leach liquor
Annotate: L is not for detecting, and B is GB/T5086.2-1997.
Adopt pressure testing machine to measure cured block ultimate compression strength, the result sees table 4, meets landfill disposal and requires (landfill disposal＞50kPa, banket processing＞100kPa) of building.
Table 4 cured block ultimate compression strength
Embodiment 3
(1) with acid leaching process aluminium salt printing and dyeing sludge is carried out recycling treatment, concrete grammar is the printing and dyeing sludge that contains aluminium salt to be pumped in the sludge treatment pond handle, and it is carried out gravity concentrate; To reduce the water ratio of mud; Dwindle the volume of mud, add the sulfuric acid that concentration is 0.5mol/L again, make the pH value of printing and dyeing sludge reach 3; Thorough mixing reacts to the muddy water layering; The aluminium salt recovery in the sewage of upper strata reaches 80～97%, adopts whizzer that it is dewatered, and separates in upper strata sewage to the other treating pond;
(2) with adding cement, flyash and cinder in the printing and dyeing sludge after separating in the step (1) as solidifying agent; The formation flco stirs; To solidify printing and dyeing sludge; Reduce heavy metal and COD concentration in the mud printing and dyeing leach liquor, the mass ratio of above-mentioned materials is a printing and dyeing sludge 1: cement 0.3: flyash 0.2: cinder 0.35;
(3) after stirring finishes above-mentioned mud is cleaned out the sludge treatment pond, place the square mould, divide three times filler, each filler must can carry out the filler second time, the demoulding in 24 hours after the mud moulding, the In Shade continuation maintenance of cured block after ram-jolt and compacting;
(4) Acidic Bentonite is ground into 500 orders, drops into from step (1) in the isolated sewage, stir and it was mixed fully in 15 minutes, remove wherein solubility COD, the mass ratio of the Acidic Bentonite consumption of sewage and input is 1000: 10;
(5) in step (4), add an amount of iron vitriol in the sewage after the processing; Stir and it was dissolved fully in 15 minutes; The water quality of further purifying waste water, the mass ratio of the sewage after the processing and the iron vitriol of adding is 1000: 1, discharges the sewage after purifying treatment afterwards; Its complete allow compliance with emission standards can not have a negative impact to surrounding environment;
(6) treat that sludge curing piece maintenance in the step (2) after 7 days, carries out sanitary landfill to it.
(GB/T5086.2-1997) carry out stabilization front and back mud according to " solid waste leaches the horizontal succusion of toxicity leaching method " and leach toxicity test; The heavy metal concentration and the rapid sealing degestion that adopt ICP (inductively coupled plasma emmission spectrum) to measure in the leach liquor are measured COD concentration in the leach liquor; Test-results is seen table 5, solidifies back leaching toxicity and satisfies national standard " the Hazardous wastes judging standard leaches toxicity and differentiates " (GB5085.3-2007).
COD and heavy metal concentration (mg/L) in table 5 leach liquor
Annotate: L is not for detecting, and B is GB/T5086.2-1997.
Adopt pressure testing machine to measure cured block ultimate compression strength, the result sees table 6, meets landfill disposal and requires (landfill disposal＞50kPa, banket processing＞100kPa) of building.
Table 6 cured block ultimate compression strength
To those skilled in the art; Under this patent design and specific embodiment enlightenment, some distortion that can directly derive or associate from this patent disclosure and general knowledge, those of ordinary skills will recognize also can adopt additive method; Or the substituting of known technology commonly used in the prior art; And the unsubstantiality of the mutual various combination between characteristic or the like changes, and can be employed equally, can both realize this patent representation function and effect; Launch for example no longer one by one to describe in detail, all belong to this patent protection domain.
Claims (4)
1. the resource utilization of an aluminate coagulating mud and safe disposal method is characterized in that this method comprises following operation steps:
(1) with acid leaching process aluminium salt printing and dyeing sludge is carried out recycling treatment, concrete grammar is the printing and dyeing sludge that contains aluminium salt to be pumped in the sludge treatment pond handle, and it is carried out gravity concentrate; To reduce the water ratio of mud; Dwindle the volume of mud, add the sulfuric acid that concentration is 0.5mol/L again, make the pH value of printing and dyeing sludge reach 3; Thorough mixing reacts to the muddy water layering; The aluminium salt recovery in the sewage of upper strata reaches 80～90%, adopts whizzer that it is dewatered, and separates in upper strata sewage to the other treating pond;
(2) with adding cement, flyash and cinder in the printing and dyeing sludge after separating in the step (1) as solidifying agent; The formation flco stirs; To solidify printing and dyeing sludge; Reduce heavy metal and COD concentration in the mud printing and dyeing leach liquor, the mass ratio of above-mentioned materials is a printing and dyeing sludge 1: cement 0.1～0.3: flyash 0.1～0.2: cinder 0.1～0.35.
(3) after stirring finishes above-mentioned mud is cleaned out the sludge treatment pond, place the square mould, divide three times filler, each filler must can carry out the filler second time, the demoulding in 24 hours after the mud moulding, the In Shade continuation maintenance of cured block after ram-jolt and compacting;
(4) Acidic Bentonite is ground into the 300-500 order; Input is from step (1) in the isolated sewage; Stir and it was mixed fully in 15 minutes, remove wherein solubility COD, the mass ratio of the Acidic Bentonite consumption of sewage and input is 1000: 1～1000: 10;
(5) in step (4), add an amount of iron vitriol in the sewage after the processing; Stir and it was dissolved fully in 15 minutes; The water quality of further purifying waste water, the mass ratio of the sewage after the processing and the iron vitriol of adding is 1000: 1, discharges the sewage after purifying treatment afterwards;
(6) treat that sludge curing piece maintenance in the step (2) after 5-7 days, carries out sanitary landfill to it.
2. the stable curing method of aluminate coagulating mud according to claim 1 is characterized in that the mass ratio of each moity in the step (2) of this stable curing method is a printing and dyeing sludge 1: cement 0.2: flyash 0.15: cinder 0.2.
3. according to the stable curing method of the described aluminate coagulating mud of claim 1-2, it is characterized in that the mass ratio of the Acidic Bentonite consumption of sewage and input in the step (4) of this stable curing method is 1000: 5.
4. according to the stable curing method of the described aluminate coagulating mud of claim 1-3, it is characterized in that the curing time of the middle sludge curing piece of step (6) of this stable curing method is 6 days.
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| CN104692602A (en) * | 2015-02-13 | 2015-06-10 | 南京大学 | Aluminum salt cyclic hardening regeneration system for coagulated sludge and method of processing coagulated sludge |
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