CN115259457A - Blast furnace gas washing and sludge water treatment method - Google Patents
Blast furnace gas washing and sludge water treatment method Download PDFInfo
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- CN115259457A CN115259457A CN202210893142.XA CN202210893142A CN115259457A CN 115259457 A CN115259457 A CN 115259457A CN 202210893142 A CN202210893142 A CN 202210893142A CN 115259457 A CN115259457 A CN 115259457A
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- wastewater
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- gas washing
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000010802 sludge Substances 0.000 title claims abstract description 30
- 238000005406 washing Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 43
- 239000012528 membrane Substances 0.000 claims abstract description 17
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 16
- 230000020477 pH reduction Effects 0.000 claims abstract description 11
- 238000011033 desalting Methods 0.000 claims abstract description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 8
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 8
- 239000000701 coagulant Substances 0.000 claims abstract description 6
- 238000007654 immersion Methods 0.000 claims abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 8
- 229910021529 ammonia Inorganic materials 0.000 abstract description 4
- 238000005352 clarification Methods 0.000 abstract description 4
- 238000010612 desalination reaction Methods 0.000 abstract description 4
- 238000001471 micro-filtration Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- -1 salt ions Chemical class 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a method for treating blast furnace gas washing sludge discharge water. The method comprises the following steps: collecting the wastewater of the desalting tower; removing sludge in the collected wastewater; pretreating the wastewater; treating the pretreated wastewater by using an immersion type/tubular ultrafiltration system; carrying out acidification treatment on the ultrafiltered wastewater; treating the acidified wastewater by using a DTRO membrane treatment system; and treating the wastewater treated by the DTRO membrane by using a roll-type RO membrane system. The invention realizes the functions of clarification and microfiltration by pretreating the wastewater, realizes the removal of hardness and suspended matters by adding sodium carbonate and a coagulant, further removes the hardness and the suspended matters by submerged ultrafiltration of the pretreated wastewater, effectively controls ammonia in the wastewater to keep an ionic state by acidification treatment, and finally realizes the desalination and recycling of the wastewater by DTRO and roll-type RO.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a blast furnace gas washing sludge discharge water treatment method.
Background
In the last decade, the blast furnace gas washing sewage treatment technology is greatly developed, the circulation rate of some plants reaches 94%, and the cascade utilization rate of some plants reaches more than 90%. The blast furnace gas washing water treatment process comprises the main processes of precipitation, cooling, water quality stabilization, sludge dehydration and utilization and the like. At present, basically, the whole system runs in a high-concentration circulating mode, sludge is discharged periodically to ensure stable operation, blast furnace gas washing sludge discharge water has the characteristics of high-concentration COD (chemical oxygen demand), high-concentration ammonia nitrogen and high-concentration chloride ions, and the sludge discharge water can be used as a mixing raw material to be consumed in a steel plant. In order to avoid the accumulation of various scaling ions in water, which exceeds the calcium tolerance range of the scale inhibition and dispersion agent, scaling phenomenon is generated, a large amount of discharged sludge water cannot be completely consumed, and the long-term accumulation of the scaling ions inevitably causes discharge and environmental pollution, so that a treatment process aiming at the characteristics of the blast furnace gas washing sludge water is urgently needed, and the problems that the blast furnace gas washing sludge water pollutes the environment and cannot be efficiently recycled are solved.
Disclosure of Invention
In order to overcome the defects, the invention provides a blast furnace gas washing and sludge water discharging treatment method.
In order to achieve the purpose, the method for treating the blast furnace gas washing sludge water comprises the following steps:
collecting desalination tower wastewater;
removing sludge in the collected wastewater;
pretreating the wastewater;
treating the pretreated wastewater by using an immersed/tubular ultrafiltration system;
carrying out acidification treatment on the ultrafiltered wastewater;
treating the acidified wastewater by using a DTRO membrane treatment system;
and treating the wastewater treated by the DTRO membrane by using a roll-type RO membrane system.
Further, the method also comprises the step of decarbonizing the wastewater treated by the roll-type RO membrane system.
Further, the pretreatment step comprises the steps of adding sodium carbonate and a coagulant into the wastewater to remove hardness and suspended matters and clarify the wastewater.
Further, the acidification treatment comprises the following steps: and adding hydrochloric acid into the wastewater to adjust the pH =6.
In order to achieve the aim, the blast furnace gas washing sludge water treatment system comprises a desalting tower wastewater collection tank → sludge concentration/dehydration → a pretreatment device → an immersion type/tubular ultrafiltration system → acidification treatment → a primary DTRO membrane treatment system → a secondary roll type RO membrane system treatment → a carbon remover which are sequentially connected.
Further, the pretreatment device consists of a triple box and a clarifier communicated with the triple box. The pretreatment device has clarification function and microfiltration filtration, and the hardness and suspended matters are removed by adding sodium carbonate and coagulant into the device.
The invention further removes hardness and turbidity from the pretreated wastewater by immersion ultrafiltration, effectively controls ammonia in the wastewater to keep an ionic state by acidification treatment, and finally realizes wastewater desalination and recycling by DTRO and roll-type RO.
Drawings
FIG. 1 is a process flow diagram of the present invention
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The blast furnace gas washing and sludge water discharging treatment system comprises a desalting tower wastewater collection tank → sludge concentration/dehydration → a pretreatment device → an immersed type/tubular ultrafiltration system → acidification treatment → a primary DTRO membrane treatment system → a secondary roll type RO membrane system treatment → a carbon remover which are sequentially connected.
Wherein, the blast furnace gas washing sludge water has high suspended matters, sludge concentration and mechanical dehydration are firstly carried out to realize sludge-water separation, and the supernatant is sent to a subsequent treatment unit;
the pretreatment device adopts a triple box and a high-efficiency clarifier, which has the functions of clarification and microfiltration, and realizes the removal of hardness and suspended matters by adding sodium carbonate and coagulant in the device, and the realization of the function is suitable for adopting integrated equipment.
In the acidification treatment (pH regulator), hydrochloric acid is added to regulate the pH =6, so that ammonia in the wastewater can be effectively controlled to keep an ionic state, and the ammonia can be intercepted to a concentrated water phase by a reverse osmosis device.
Adopt DTRO and formula of book RO series connection desalination, not only can effectively get rid of blast furnace gas washing and arrange all kinds of salt ions such as high concentration COD, high concentration ammonia nitrogen and chloride ion in the muddy water, through DTRO's application, effectively alleviateed the dirty stifled of system moreover.
The method is characterized in that the blast furnace gas washing sludge water has high alkalinity, a carbon remover is added in the post-treatment, and bicarbonate radicals in the wastewater are removed in the form of carbon dioxide through blowing by a fan, so that the alkalinity in the wastewater is efficiently removed.
The invention is further described with reference to specific examples.
South district of iron-making headquarters of Maanshan iron and Steel works Ltd, where 1#2500m is available3Blast furnace, 2#2500m3、3#1080m3、4#3200m3The blast furnaces are 4 blast furnaces, the 4 blast furnaces are all provided with blast furnace gas desalting washing towers, washing water nozzles are arranged in the towers, sodium hydroxide or sodium carbonate is doped in the washing water, the blast furnace gas enters from the lower part of the tower in a counter-current mode, the washing water is sprayed from the upper part, and the blast furnace gas is fully contacted with the sodium hydroxide and sodium carbonate solution of the washing water, so that the aim of removing substances such as sulfur ions, chloride ions and the like in the gas is fulfilled. The washing water backwater flows into a coal gas washing backwater pool, enters a cold water pool after being pressurized, cooled and filtered, and is pressurized by a pump and sent to a desalting tower for recycling. When the ion concentration in the circulating water reaches a certain degree, a part of the strong brine needs to be replaced and discharged, so that the functional use of the desalting tower is ensured. The following table shows the long-term monitoring data of the blast furnace gas washing and sludge-discharging water:
TABLE 1 blast furnace gas washing and sludge water quality data table
| Serial number | Item | Numerical values (Unit mg/L) | Remarks to note |
| 1 | pH | 7.0～7.8 | Without unit |
| 2 | CODcr | 1000 | |
| 3 | BOD5 | 250 | |
| 4 | Ammonia nitrogen | 800 | |
| 5 | Total nitrogen | 1100 | |
| 6 | SS | 4000 | |
| 7 | TDS | 18000 | |
| 8 | Chloride ion | 10000 | |
| 9 | Hardness of | 1000 | |
| 10 | Alkalinity | 7000 |
The project is executed according to the requirements of the quality of the make-up water of an open type circulating cooling water system in the quality of urban sewage recycling industry GB/T19923-2005 and the relevant water quality standard in the design Specification of iron and steel enterprises GB/T19923-2005, and the requirements are shown in the following table:
table 2 design of effluent quality
The project treats high-salinity wastewater of 250m3The process flow is as follows: the method comprises the steps of firstly, desalting tower wastewater collection tank → sludge concentration → pretreatment device (triple box + high-efficiency clarifier) → tubular ultrafiltration system → acidification treatment → primary DTRO membrane treatment system → secondary roll type RO membrane system treatment → decarbonizer → desalting tower system water replenishing.
The pretreatment device has a clarification effect and microfiltration filtration, and the hardness and suspended matters are removed by adding sodium carbonate and a coagulant into the device.
The project is built and stably operated at present, and finally produced water replaces part of reclaimed water and enters a desalting tower system as make-up water; and (4) delivering the strong brine and the muddy water generated in the depth system to an OG sludge treatment system in the factory for batching.
The present invention is described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Many other changes and modifications may be made without departing from the spirit and scope of the invention and should be considered as within the scope of the invention.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The blast furnace gas washing sludge water treatment method is characterized by comprising the following steps:
collecting the wastewater of the desalting tower;
removing sludge in the collected wastewater;
pretreating the wastewater;
treating the pretreated wastewater by using an immersion type/tubular ultrafiltration system;
carrying out acidification treatment on the ultrafiltered wastewater;
treating the acidified wastewater by using a DTRO membrane treatment system;
and treating the wastewater treated by the DTRO membrane by using a roll-type RO membrane system.
2. The blast furnace gas washing sludge water treatment method according to claim 1, characterized in that the wastewater treated by the roll-type RO membrane system is decarbonized.
3. The blast furnace gas washing sludge water treatment method according to claim 1, wherein the pretreatment step comprises adding sodium carbonate and coagulant into the wastewater to remove hardness and suspended matters and clarify the wastewater.
4. The method for treating the blast furnace gas washing sludge water according to claim 1, wherein the acidification treatment comprises: and adding hydrochloric acid into the wastewater to adjust the pH =6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210893142.XA CN115259457A (en) | 2022-07-27 | 2022-07-27 | Blast furnace gas washing and sludge water treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210893142.XA CN115259457A (en) | 2022-07-27 | 2022-07-27 | Blast furnace gas washing and sludge water treatment method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101066815A (en) * | 2007-06-05 | 2007-11-07 | 邯郸钢铁股份有限公司 | Deep treatment process of metallurgical sewage |
| CN106396228A (en) * | 2016-09-18 | 2017-02-15 | 内蒙古久科康瑞环保科技有限公司 | Device and method for treating industrial wastewater with high salt content |
| CN107253798A (en) * | 2017-05-26 | 2017-10-17 | 浙江富春紫光环保股份有限公司 | A kind of advanced treatment and reclamation group technology of wastewater of steel industry |
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| CN217868437U (en) * | 2022-07-27 | 2022-11-22 | 中冶华天工程技术有限公司 | Integrated treatment system applied to blast furnace gas washing and sludge discharging water |
-
2022
- 2022-07-27 CN CN202210893142.XA patent/CN115259457A/en active Pending
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