CN113023989A - Method for treating silicon-containing sludge by using wastewater zero discharge system - Google Patents
Method for treating silicon-containing sludge by using wastewater zero discharge system Download PDFInfo
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- CN113023989A CN113023989A CN202110272770.1A CN202110272770A CN113023989A CN 113023989 A CN113023989 A CN 113023989A CN 202110272770 A CN202110272770 A CN 202110272770A CN 113023989 A CN113023989 A CN 113023989A
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- wastewater
- containing sludge
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- 239000010802 sludge Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002351 wastewater Substances 0.000 title claims abstract description 33
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 23
- 229910052710 silicon Inorganic materials 0.000 title claims description 23
- 239000010703 silicon Substances 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000001556 precipitation Methods 0.000 claims description 24
- 239000002699 waste material Substances 0.000 claims description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 14
- 238000002425 crystallisation Methods 0.000 claims description 13
- 230000008025 crystallization Effects 0.000 claims description 12
- 238000001704 evaporation Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000005245 sintering Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000006228 supernatant Substances 0.000 claims description 10
- 230000008020 evaporation Effects 0.000 claims description 9
- 239000008235 industrial water Substances 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000008394 flocculating agent Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 7
- 238000004090 dissolution Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 238000001728 nano-filtration Methods 0.000 claims description 5
- 238000001223 reverse osmosis Methods 0.000 claims description 5
- 238000000108 ultra-filtration Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 238000009287 sand filtration Methods 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 25
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 239000002253 acid Substances 0.000 description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 239000000843 powder Substances 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910021577 Iron(II) chloride Inorganic materials 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- FLTRNWIFKITPIO-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe] FLTRNWIFKITPIO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- 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
- C02F11/12—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
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
-
- 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
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
-
- 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
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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Abstract
The invention discloses a method for treating siliceous sludge by using a wastewater zero discharge system, which comprises the following steps: 1) dissolving, 2) adjusting the pH value, precipitating, 3) separating, 4) secondarily dissolving, 5) softening, 6) precipitating, 7) returning sludge to production, and 8) treating wastewater.
Description
Technical Field
The invention belongs to the field of resource environment protection, and particularly relates to treatment of silicon-containing sludge.
Background
The cold rolling acid pickling dephosphorization is a necessary process for steel and iron united enterprises, a large amount of waste acid is generated in the dephosphorization process, and the waste acid contains a large amount of HCl and Fe2O3And a small amount of SiO2The waste acid can be recovered and regenerated, the acid regeneration process can recover and regenerate hydrochloric acid for cyclic utilization, and a byproduct of ferric oxide powder can be obtained. Before acid regeneration, SiO needs to be removed2So as to prevent the formation of silicon mud, block the pipeline and influence the quality of the byproduct iron oxide powder. SiO removal from waste acid2The process comprises the following steps:
1) and (3) putting the waste steel sheets into the waste acid, so that free HCl in the waste acid and the waste steel sheets can fully react, and free acid in the waste acid is reduced.
Fe+2HCl→FeCl2+H2↑
Fe2O3+6HCl→2FeCl3+3H2O
2) Adding ammonia water to increase pH value of waste acid to make part of Fe2+Formation of Fe (OH)2Formation of Fe (OH) by aeration3And the flocculating constituent is used for adsorbing silicon in the waste acid, and removing the silicon in the waste acid from the waste acid through sedimentation in a sedimentation tank and filtration by a filter press to form silicon-containing sludge.
2NH3+2H2O+FeCl2→Fe(OH)2↓+2NH4Cl
2Fe(OH)2+1/2O2+H2O→2Fe(OH)3↓
FeCl3+3NH3+3H2O→Fe(OH)3↓+3NH4Cl
Therefore, the siliceous sludge contains a large amount of iron and chloride ions, and also contains a small amount of aluminum, manganese and other elements. The method comprises the following specific steps:
table 1: silicon-containing sludge composition table (%)
The silicon-containing sludge has stable components, wherein Fe, Al, Mn, Ti and Cr exist in the form of hydroxide precipitates, chlorine and phosphorus exist in the form of ions, and the full separation can be realized through water washing.
The chloride ions in the wastewater of the steel industry mainly come from two parts: the first is brought in iron ore and coal, especially imported ore which is used for long-distance transportation by domestic enterprises, and the imported ore is contacted with seawater in the long-distance ocean transportation process, so that the content of chloride ions is higher. In the steel manufacturing process, chloride ions enter flue gas through high-temperature heating, are supplemented and collected by a flue gas treatment system, and finally enter wet desulphurization wastewater and sintering desulphurization acid-making wastewater; and more than ten sets of circulating water treatment systems and wastewater treatment systems are generally arranged in a combined iron and steel plant, and hydrochloric acid, a coagulant (PAC), sodium hypochlorite and the like are added in the wastewater treatment process to play roles in regulating the pH value, coagulating and the like. Chloride ions corrode common steel equipment more seriously, and have great side effects on the service life of equipment, pipelines and machinery. Because the chloride ion precipitate is extremely little, the chloride ion can be removed only by adopting an evaporation crystallization method, and the influence of the chloride ion on the intrinsic safety of equipment is eliminated.
With the increasing requirements on environmental protection and energy conservation, steel enterprises gradually reduce external drainage, and Baozianjiang steel establishes an MVR evaporative crystallization system, so that zero emission of wastewater from a whole plant is realized, chloride ions cannot be enriched in a water system, and risks such as corrosion of pipelines and equipment are avoided.
The siliceous sludge is returned to a wastewater zero discharge system for treatment, which can cause the concentration of chloride ions in the wastewater to rise, and the chloride ions are gradually added in proper amount according to the flux condition of the return osmosis membrane. The production of the silicon-containing sludge and the wastewater of the iron and steel enterprises is related to the yield, the enterprises which do not finish the design can consider to increase the flux of the permeable membrane at the initial stage of the design, the enterprises which are put into use can consider to adopt two-stage dissolution, and the primary dissolution waste liquid enters an evaporative crystallization system after the pH value is adjusted; and the secondary dissolved waste liquid enters a softened sludge tank.
CN 105948705 discloses a method for utilizing siliceous sludge, which comprises pretreating siliceous sludge, mixing with clay, coal powder and recycled waste concrete powder, making into adobes, and firing into bricks. CN 104118974, the Chinese patent is to add siliceous sludge and industrial hydrochloric acid into a reaction kettle, heat and stir the mixture, cool the mixture, add sodium chlorate into the mixture, and finally cool and crystallize the mixture to recover the mixture of ferric chloride and sodium chloride.
The silicon-containing sludge is a special hazardous waste generated in steel plants, and has low utilization value outside the plants and great treatment difficulty. The CN 105948705 patent does not describe a pretreatment method of silicon-containing sludge, and during the green brick firing process, chlorine volatilizes into water vapor to cause pipeline corrosion and pollute the environment; the CN 104118974 patent has great utilization difficulty, and the mixture of ferric chloride and sodium chloride has more impurities and great utilization difficulty.
According to the invention, the silicon-containing sludge is put into the wastewater zero discharge system, after solid-liquid separation, precipitates such as Fe, Al, Mn, Ti, Cr and the like are returned to the production and utilization of the sintering process in the steel plant along with the softened sludge, and only chloride ions and a small amount of phosphate ions entering the wastewater system have little influence on the wastewater zero discharge system, so that the method has a high popularization value.
Disclosure of Invention
The invention discloses a method for treating silicon-containing sludge by using a wastewater zero discharge system, which has the advantages of low operation cost, convenient operation and small influence on the wastewater zero discharge system, can realize short-distance treatment and resource recovery, and simultaneously reduces the burden of social treatment.
The specific scheme of the invention is as follows: adding the silicon-containing sludge into a regulating reservoir, fully stirring and dissolving, pumping the wastewater in the regulating reservoir into a softening reservoir, softening, precipitating and filter-pressing to form iron-containing sludge, returning the formed iron-containing sludge to the sintering process of an iron and steel plant for production and utilization, simultaneously, introducing the generated wastewater into an existing wastewater zero-discharge system, performing ultrafiltration, reverse osmosis and nanofiltration, introducing the wastewater into an MVR (mechanical vapor recompression) evaporative crystallization system, forming distilled water by water, and forming chloride ions into industrial salt through evaporative crystallization.
The specific technical scheme is as follows:
a method for treating siliceous sludge by using a wastewater zero discharge system is characterized by mainly comprising the following steps:
(1) dissolving: fully and uniformly mixing the silicon-containing sludge and industrial water;
(2) and (3) precipitation: adjusting the pH value of the mixture in the step (1) and adding a flocculating agent for precipitation;
(3) separation: separating the supernatant of step (2);
(4) and (3) secondary dissolution: adding the lower layer waste liquid and the precipitate into a regulating tank, and fully stirring and dissolving the lower layer waste liquid and the precipitate with industrial water.
(5) Softening: conveying the dissolved solution in the step (4) to a softening reaction tank, adding sodium carbonate for softening, and adjusting the pH value to 8-10;
(6) and (3) precipitation: adding a flocculating agent for precipitation, and filtering to obtain softened sludge;
the softened sludge obtained by treating the silicon-containing sludge by the steps can be returned to production and utilization.
Preferably, the filtered supernatant and the treated wastewater generated in the steps (4) to (6) are conveyed to a crystallization and evaporation system, the water forms distilled water, and chloride ions form industrial salt through evaporation and crystallization.
Preferably, in the step (1), the addition amount of the siliceous sludge is not more than 10%, and the stirring time is more than 30 min.
Preferably, the pH is adjusted to 8 to 9 in step (2).
Preferably, the chlorine ion concentration of the regulating reservoir in the step (4) is less than 3500 ppm.
Preferably, the precipitation method in step (6) is plate precipitation or high density precipitation.
Preferably, the precipitation filtration method in the step (6) is one of plate-and-frame filter pressing, belt filter pressing, screw pressing and centrifugal dewatering.
Preferably, the production and utilization mode is to perform sintering after drying, perform sintering after mixing with the fly ash or add cold briquetting to the converter.
Preferably, the manner of filtering the supernatant is sand filtration.
Preferably, the wastewater generated in (4) to (6) is treated by sequentially performing ultrafiltration, reverse osmosis and nanofiltration. The invention has the following characteristics:
1) the silicon-containing sludge is treated by utilizing the existing wastewater zero-discharge system in a steel plant, so that the social treatment capacity is reduced, and the outsourcing treatment cost of hazardous wastes is saved.
2) The solid matter in the treatment process is sintered and utilized, the industrial salt is produced by evaporating the wastewater, and no wastewater or other solid wastes are produced in the treatment process.
3) The invention is suitable for all iron and steel enterprises with evaporation crystallization treatment process, has small influence on the system, low treatment cost and convenient operation.
Detailed Description
Example 1:
1) dissolving: fully and uniformly mixing 7.42 tons of silicon-containing sludge and 80.7 tons of industrial water, and stirring for 40 min;
2) adjusting the pH value to precipitate: adding sodium hydroxide to adjust the pH value to 8, keeping stirring, and adding a flocculating agent for precipitation;
3) separation: separating the supernatant;
4) and (3) secondary dissolution: 15.12 tons of lower-layer waste liquid and precipitates are gradually added into an adjusting tank within 3 hours, 200 tons of industrial water is introduced into the adjusting tank, the industrial water is fully stirred and dissolved for 30min, and the chloride ion 2416ppm in the adjusting tank is lower than the design requirement of 3500ppm of Zhanjiang iron and steel;
5) softening: conveying the dissolved solution in the regulating tank to a softening reaction tank, adding sodium carbonate for softening, and adding sodium hydroxide for regulating the pH value to 9.2;
6) and (3) precipitation: adding a flocculating agent for precipitation and filtration, adopting a high-density sedimentation tank for precipitation, and filtering by using a plate-and-frame filter press to obtain softened sludge;
7) returning sludge to production: drying the softened sludge until the water content is 34.7%, conveying the dried softened sludge to a sintering raw material storage yard, uniformly mixing the dried softened sludge with pellet undersize powder and ironmaking dedusting ash, and then sintering the mixture;
8) waste liquid treatment: and (3) treating the wastewater generated in the steps 4) -7) by processes of ultrafiltration, reverse osmosis, nanofiltration and the like, feeding the wastewater and supernatant obtained in the step (3) after sand filtration of 73 tons into an MVR evaporation crystallization system, and performing evaporation crystallization to generate 2.4 tons of industrial salt and 271 tons of distilled water.
Example 2:
1) dissolving: fully and uniformly mixing 6.37 tons of silicon-containing sludge and 66.5 tons of industrial water, and stirring for 50 min;
2) adjusting the pH value to precipitate: adding sodium hydroxide to adjust the pH value to 9, keeping stirring, and adding a flocculating agent for precipitation;
3) separation: separating the supernatant;
4) and (3) secondary dissolution: 13.40 tons of lower-layer waste liquid and sediments are gradually added into an adjusting tank within 3 hours, 150 tons of industrial water is introduced into the adjusting tank, the materials are fully stirred and dissolved for 30min, and 2498ppm of chloride ions in the adjusting tank are lower than 3500ppm of Zhanjiang steel;
5) softening: conveying the dissolved solution in the regulating tank to a softening reaction tank, adding sodium carbonate for softening, and adding sodium hydroxide for regulating the pH value to 10;
6) and (3) precipitation: adding a flocculating agent for precipitation and filtration, adopting a high-density sedimentation tank for precipitation, and filtering by using a plate-and-frame filter press to obtain softened sludge;
7) returning sludge to production: drying the softened sludge until the water content is 33.2%, conveying the dried softened sludge to a sintering raw material storage yard, uniformly mixing the dried softened sludge with pellet undersize powder and ironmaking dedusting ash, and then sintering the mixture;
waste liquid treatment: and (3) after the wastewater generated in the steps 4) -7) is treated by processes of ultrafiltration, reverse osmosis, nanofiltration and the like, the wastewater and the supernatant obtained in the step (3) after 73 tons of sand filtration enter an MVR evaporation crystallization system, 1.9 tons of industrial salt is generated through evaporation crystallization, and the distilled water is 212 tons.
TABLE 2 softened sludge composition%
Table 3: industrial salt content%
| Serial number | Purity of | Ca2+ | Mg2+ | SO42- | Water content ratio |
| Example 1 | 99.79 | <0.01 | <0.01 | 0.03 | 0.16 |
| Example 2 | 99.84 | <0.01 | <0.01 | 0.03 | 0.11 |
Claims (10)
1. A method for treating siliceous sludge by using a wastewater zero discharge system is characterized by mainly comprising the following steps:
(1) dissolving: fully and uniformly mixing the silicon-containing sludge and industrial water;
(2) and (3) precipitation: adjusting the pH value of the mixture in the step (1) and adding a flocculating agent for precipitation;
(3) separation: separating the supernatant of step (2);
(4) and (3) secondary dissolution: adding the lower layer waste liquid and the precipitate into a regulating tank, and fully stirring and dissolving the lower layer waste liquid and the precipitate with industrial water.
(5) Softening: conveying the dissolved solution in the step (4) to a softening reaction tank, adding sodium carbonate for softening, and adjusting the pH value to 8-10;
(6) and (3) precipitation: adding a flocculating agent for precipitation, and filtering to obtain softened sludge;
the softened sludge obtained by treating the silicon-containing sludge by the steps can be returned to production and utilization.
2. The method of claim 1, further comprising: and (4) conveying the filtered supernatant and the treated wastewater generated in the steps (4) to (6) to a crystallization evaporation system, wherein distilled water is formed by water, and industrial salt is formed by evaporating and crystallizing chloride ions.
3. The method according to claim 1 or 2, characterized in that: in the step (1), the adding amount of the silicon-containing sludge is not more than 10%, and the stirring time is more than 30 min.
4. The method according to claim 1 or 2, characterized in that: and (3) adjusting the pH value to 8-9 in the step (2).
5. The method according to claim 1 or 2, characterized in that: and (4) the concentration of chloride ions in the regulating tank in the step (4) is lower than 3500 ppm.
6. The method according to claim 1 or 2, characterized in that: the precipitation method in the step (6) is inclined plate precipitation or high-density precipitation.
7. The method according to claim 1 or 2, characterized in that: the precipitation filtration method in the step (6) is one of plate-and-frame filter pressing, belt filter pressing, screw pressing and centrifugal dewatering.
8. The method according to claim 1 or 2, characterized in that: the production and utilization mode is to perform drying, then perform sintering, uniformly mix with the fly ash, perform sintering or mix with a cold pressing block and return to the converter.
9. The method of claim 2, wherein: the way to filter the supernatant was sand filtration.
10. The method of claim 2, wherein: and (4) treating the wastewater generated in the steps (4) to (6) by sequentially performing ultrafiltration, reverse osmosis and nanofiltration.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0228351D0 (en) * | 2002-12-05 | 2003-01-08 | Altmann Thomas | Method for the production of sodium chloride from seawater |
| CN102227375A (en) * | 2009-04-28 | 2011-10-26 | 胜高股份有限公司 | Method for cleaning silicon sludge |
| CN104909536A (en) * | 2015-06-01 | 2015-09-16 | 上海晶宇环境工程有限公司 | Washing recycling treatment process of sludge from physical and chemical treatment and special apparatus for process |
| CN105080935A (en) * | 2015-08-25 | 2015-11-25 | 湖州森诺膜技术工程有限公司 | Rubbish flying ash cement kiln co-treatment and water resource utilization system |
| CN108373249A (en) * | 2018-03-22 | 2018-08-07 | 马鞍山钢铁股份有限公司 | A kind of high chlorine iron content waste sludge resource utilization method and its processing system |
| CN210117307U (en) * | 2019-03-24 | 2020-02-28 | 长兴上拓环境科技有限公司 | Waste incineration fly ash washing water resource treatment system |
-
2021
- 2021-03-13 CN CN202110272770.1A patent/CN113023989A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0228351D0 (en) * | 2002-12-05 | 2003-01-08 | Altmann Thomas | Method for the production of sodium chloride from seawater |
| CN102227375A (en) * | 2009-04-28 | 2011-10-26 | 胜高股份有限公司 | Method for cleaning silicon sludge |
| CN104909536A (en) * | 2015-06-01 | 2015-09-16 | 上海晶宇环境工程有限公司 | Washing recycling treatment process of sludge from physical and chemical treatment and special apparatus for process |
| CN105080935A (en) * | 2015-08-25 | 2015-11-25 | 湖州森诺膜技术工程有限公司 | Rubbish flying ash cement kiln co-treatment and water resource utilization system |
| CN108373249A (en) * | 2018-03-22 | 2018-08-07 | 马鞍山钢铁股份有限公司 | A kind of high chlorine iron content waste sludge resource utilization method and its processing system |
| CN210117307U (en) * | 2019-03-24 | 2020-02-28 | 长兴上拓环境科技有限公司 | Waste incineration fly ash washing water resource treatment system |
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