CN107235590A - The handling process that a kind of zero-emission of containing wastewater from catalyst and recycling are recycled - Google Patents
The handling process that a kind of zero-emission of containing wastewater from catalyst and recycling are recycled Download PDFInfo
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
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Abstract
The present invention relates to the integrated treatment process that a kind of Catalyst Production comprehensive wastewater zero-emission and recycling are recycled.The integrated technique mainly includes efficiently softening except system on silicon, media filtration system, ultrafiltration system, ion exchange system, nanofiltration system, salt made from earth containing a comparatively high percentage of sodium chloride separation membranous system, counter-infiltration system, electrodialysis system, deamination evaporation and crystallization system and salt made from earth containing a comparatively high percentage of sodium chloride coproduction evaporation and crystallization system.The handling process is used to handle the comprehensive wastewater with high ammonia nitrogen and high silicon high salt characteristic discharged in Catalyst Production preparation process, efficiently solve that dioxide-containing silica is high-leveled and difficult to be removed, the problems such as crystal salt quality is low, carnallite amount is big, ultimately form Catalyst Production process water, sodium chloride product and sodium sulphate product, effectively realize the purpose that such waste water reaches zero-emission and recycling after processing.
Description
Technical field
The invention belongs to field of waste water treatment, and in particular to a kind of to realize that is discharged in catalyst production process has high ammonia
The handling process that the zero-emission of the comprehensive wastewater of nitrogen high-silicon high salt characteristic and recycling are recycled.
Background technology
Catalyst has in industries such as PETROLEUM PROCESSING, chemical fertilizer industry, chemicals synthesis, high polymer material preparation, environmental protection
Have important and be widely applied.The development and innovation of catalyst can promote industrial expansion, and produce huge social and economy
Benefit.China attaches great importance to the development of Catalyst Production technology, and has had certain production scale.However, catalyst is given birth to
Substantial amounts of waste water can be discharged during production, is not only polluted the environment, while the substantial amounts of wasting of resources can be caused.Therefore, for urging
The Processing Technology Research for changing agent production waste water is extremely urgent, especially for its waste water zero-discharge technology and resources circulation reuse skill
The research of art and realize industrialization have very important practical significance, be the solid of China's Catalyst sustainable development
Basis.
Partial catalyst（Refer to the oil refining catalyst that the devices such as catalytic cracking, catalytic reforming and hydrofinishing are used more）Production
The waste water of discharge mainly has following characteristics：
（1）Ammonia-nitrogen content is high, usually 100-2000mg/L;
（2）Salt content is higher, predominantly sulfate, chloride etc., and concentration is up to 10000 more than mg/L；
（3）It is containing high concentrations of suspended solids, usually 50-1000 mg/L；
（4）Silicone content is higher, usually 20-120 mg/L；
（5）TOC contents are very low, substantially less than 10mg/L.
Handling process currently for such waste water mainly has：
（1）Using bioanalysis（A/O、A2/ O, oxidation ditch, modified SBR, short-cut nitrification and denitrification etc.）Removed etc. technique after ammonia nitrogen
Directly discharge, because C/N, than serious unbalance, generally increases biodegradability by adding carbon source in waste water, often result in operation
Cost is high, total nitrogen situation not up to standard in production water；
（2）Using physico-chemical process（Absorption, ion exchange, oxidation, stripping etc.）Or the technique such as hot method remove ammonia nitrogen after directly discharge,
Or by Physical after such waste water is mixed with high concentrated organic wastewater（Flocculation sediment）After the coupling processing of bioanalysis
Directly discharge, although handling process can be with qualified discharge, however as increasingly stricter environmental emission standard in early stage（Especially
It is the control to saliferous figureofmerit in waste discharge）And control and management of the enterprise to water resource are constantly strengthened, and have highlighted
Technique is had to be unable to reach New emission standard and waste the shortcoming of great lot of water resources；
（3）By going after the polluters such as oil removal, silicon, ammonia nitrogen, then pass through reverse osmosis membrane concentration and evaporative crystallization work
Skill processing, although such technique can reach the zero-emission of waste water substantially, but whole technique evaporation capacity is larger, and evaporation is invested into
This height, and it is big so as to increase the burden of business processes solid waste or dangerous waste to ultimately form carnallite amount.
In the last few years, some sewage treatment process were developed rapidly, the coupling conventional waste water handling process of innovation with it is improved
Waste water treatment process technology, zero-emission and resources circulation are realized by the catalyst production waste water with high ammonia nitrogen and high silicon high salt characteristic
Reuse is the developing direction of its handling process.
The content of the invention
It is an object of the invention to solve prior art problem, there is provided the zero-emission of containing wastewater from catalyst and recycling recovery profit
Handling process, it is possible to achieve the comprehensive wastewater with high ammonia nitrogen and high silicon high salt characteristic discharged in catalyst production process
Zero-emission and recycling are recycled.Present invention employs following scheme：
The handling process that a kind of containing wastewater from catalyst zero-emission and recycling are recycled, including following process step：
（1）By the high ammonia nitrogen and high silicon high-salt wastewater formed in catalyst production process be emitted into balancing tank stop 20 hours with
On, the step is used to adjust catalyst comprehensive wastewater water quality and quantity；
（2）Balancing tank water outlet enters efficiently softening after pump is lifted and removes system on silicon, and the step is effectively removed in the middle part of waste water
Divide the polluters such as hardness, basicity, suspension, organic matter, silica；
（3）Efficiently softening enters media filtration system except system on silicon produces water, and the pretreatment system as embrane method concentration is used for
Remove the polluter such as partial suspended thing in waste water；
（4）Media filtration system production water enters ultrafiltration system, and the ultrafiltration system further removes suspension, glue in waste water
The polluters such as body, bacterium are so as to mitigate nanofiltration, salt made from earth containing a comparatively high percentage of sodium chloride seperation film, counter-infiltration, the pollution level of amberplex；
（5）Ultrafiltration system production water enters ion exchange system, further removes calcium ions and magnesium ions, prevents aftertreatment systems fouling；
（6）Ion exchange system production water enters nanofiltration system, and waste water is separated into based on sodium sulphate by the effect of NF membrane
Concentrated water and production water based on sodium chloride, concentrated water enters step（7）Processing, production water enters step（8）Processing；
（7）Step（6）Concentrated water after processing enters salt made from earth containing a comparatively high percentage of sodium chloride and separates membranous system, by the effect of salt made from earth containing a comparatively high percentage of sodium chloride seperation film by sodium sulfate concentration
Further improve as concentrated water, into salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system, i.e. step（12）Processing, salt made from earth containing a comparatively high percentage of sodium chloride separation membranous system production water with
Nanofiltration production water is mixed into step（8）Processing；
（8）Step（6）Production water after processing enters first-stage reverse osmosis system, by the inspissation of first-stage reverse osmosis film by waste water
In sodium chloride concentration improve as concentrated water, into step（9）Processing, first-stage reverse osmosis production water enters step（10）Processing；
（9）Step（8）Concentrated water after processing enters electrodialysis system, passes through the work of anions and canons exchange membrane in electrodialysis plant
Further improved to more than 23% with by the sodium chloride concentration in the concentrated water, high strong brine is formed, into step（11）Processing,
The light salt brine that electrodialysis system can be also formed after desalination simultaneously, is back to step（8）Processing；
（10）Step（8）Production water after processing enters two-stage reverse osmosis system, is separated again by the effect of two-pass reverse osmosis film
For concentrated water and production water, the concentrated water of two-stage reverse osmosis system is back to step（8）Processing, the production water of two-stage reverse osmosis system enters reuse
Water tank；
（11）Step（9）High strong brine and step after processing（12）In a part of mother liquor enter deamination evaporation and crystallization system,
It is the supersaturated mother liquor of sodium chloride to be concentrated by evaporation after deamination, is partly into crystallizer formation sodium chloride crystal salt, is partly into
Step（12）Transported to outside the condensate liquid formed in processing, evaporation process and use water spot；
（12）Step（7）Concentrated water and step after processing（11）In a part of mother liquor enter salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system, evaporation
Crystallization forms anhydrous sodium sulfate crystalline salt, while a part of mother liquor of salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system enters step（11）Deamination steam
Send out crystal system.
It is preferred that, step（2）In the upflow velocity that sets except system on silicon of efficient softening as 5-10m/h, using magnesium chloride
As removing the medicament of silicon, and adjust pH and reach 10.5-11.5.
It is furthermore preferred that step（2）In efficiently softening device for collecting ammonia gas is set except system on silicon, and ammonia is led into absorption
Tower.
It is preferred that, step（4）In the ultrafiltration system rate of recovery be set as 90%-93%, the preferred PVDF of membrane material.
It is preferred that, step（5）In ion exchange system use macropore sodium form weak acid positive resin, the regeneration of resin is
Acid regeneration alkali makes the transition, and the regenerative wastewater of ion exchange system is back to regulating reservoir.
It is preferred that, step（6）Sulfate concentration is more than 50000mg/L in concentrated water after being concentrated in middle nanofiltration system.
It is preferred that, step（7）In salt made from earth containing a comparatively high percentage of sodium chloride separation membranous system salt made from earth containing a comparatively high percentage of sodium chloride separation retaining molecular weight be 150-300 dongles
, the rejection to sulfate radical is more than 99%.
It is furthermore preferred that step（7）The TDS of middle salt made from earth containing a comparatively high percentage of sodium chloride separation membranous system concentrated water is more than 180000mg/L.
It is preferred that, step（8）In the rate of recovery of first-stage reverse osmosis system be set as 50%-70%.
It is preferred that, step（9）In electrodialysis system use homogeneous anions and canons exchange membrane, the highly concentrated salt ultimately formed
The mass concentration of sodium chloride is more than 23% in water.
It is preferred that, step（10）In the rate of recovery of two-stage reverse osmosis system be set as 80%-90%.
It is preferred that, step（11）Middle deamination vapo(u)rization system is using stripping deamination and evaporation integral equipment, evaporative crystallization mistake
Partial mother liquid is emitted into salt made from earth containing a comparatively high percentage of sodium chloride combined production of crystallized system in journey.
It is preferred that, step（12）The technique that MVR+ multiple-effect evaporations are used in middle salt made from earth containing a comparatively high percentage of sodium chloride coproduction evaporation and crystal process, evaporated
Processing parameter setting is that pH value is 12 in journey.
It is furthermore preferred that step（12）Partial mother liquid is back to deamination evaporative crystallization system in middle salt made from earth containing a comparatively high percentage of sodium chloride coproduction evaporation and crystal process
System.
The handling process has the advantages that：
（1）The high salt catalyst of high ammonia nitrogen and high silicon is handled by the way that " pretreatment+membrane integrating technique+evaporative crystallization " is combined to give up
Water, overcomes that blowdown flow rate present in such waste water conventional processes is big, salt content is not up to standard, carnallite treating capacity big, technique
Unstable the shortcomings of, the zero-emission of waste water was both realized, the target of Treated sewage reusing and salt recycling reuse is realized again.
（2）Using " nanofiltration+salt made from earth containing a comparatively high percentage of sodium chloride seperation film+counter-infiltration+electrodialysis+sodium chloride evaporative crystallization+salt made from earth containing a comparatively high percentage of sodium chloride coproduction evaporation knot
The technique that crystalline substance " is combined realizes sodium chloride and recovery of the anhydrous sodium sulfate crystal salt under high efficiency high-quality in waste water, and
And this technique is adapted to total salt amount and the big situation of different salinity fluctuations in raw water quality, overcomes traditional sal prunella coproduction and steams
Crystal system is sent out to salt made from earth containing a comparatively high percentage of sodium chloride in water than requiring strict shortcoming.
（3）Using stripping deamination and evaporation integral technique in sodium chloride vapo(u)rization system, effectively combine evaporation and returned with ammonia
Knock off skill.
（4）Using partial mother liquid circulating reflux between control sodium chloride deamination vapo(u)rization system and sal prunella coproduction vapo(u)rization system
Mode, it is ensured that the shortcoming of carnallite discharge during such wastewater zero discharge is overcome while sodium chloride crystal salt quality.
（5）Deamination evaporation and crystallization system pre-treating technology is used as using electrodialysis, it is possible to achieve enter chlorine before vapo(u)rization system
Change sodium mass concentration and reach more than 23%, greatly reduce the scale of investment of vapo(u)rization system.
（6）By the way of nanofiltration system, salt made from earth containing a comparatively high percentage of sodium chloride separation membranous system are combined with counter-infiltration system, it is ensured that whole film concentration
The operation stability and high-recovery of technique, while reducing the wastewater flow rate of evaporation, improve the quality of recycle-water and product salt,
And ensure that whole set process is reliable under Low investment cost.
（7）The regeneration that ion exchange resin is made the transition by acid regeneration alkali, it is ensured that the exchange capacity of resin, increase
The reliability of subsequent treatment process.
（8）Using efficient softening except pretreatment system of the system on silicon as over all Integration technique, softening and except silicon efficiency high,
And dosing species chemical feeding quantity can be adjusted flexibly and removes part hardness, basicity, suspension, organic matter, silica in waste water
Deng polluter, it is ensured that the stability of subsequent technique.
Brief description of the drawings
Fig. 1：The high salt catalyst wastewater zero-emission of high ammonia nitrogen and high silicon of the present invention and recycling recycle process chart.
Embodiment
With reference to embodiment, the present invention will be further described：
Embodiment 1
1st, the raw water that the containing wastewater from catalyst discharged using certain Catalyst Production company is demonstrate,proved as the present embodiment, specific water quality data is shown in
Table 1：
The influent quality of table 1
2nd, discharge of wastewater is stopped 21 hours into balancing tank, for adjusting catalyst comprehensive wastewater water quality and quantity.
3rd, balancing tank water outlet after pump is lifted enter efficiently softening remove system on silicon, add sodium hydroxide, sodium carbonate,
PAM, PAC, magnesium chloride medicament, upflow velocity is 10m/h, and pH value is adjusted to 10.8-11, the production after efficiently softening removes system on silicon
Water water quality is as shown in table 2；
Efficiently softening removes system on silicon effluent quality to table 2
4th, efficient softening is except system on silicon production water is into media filtration system and ultrafiltration system, and the rate of recovery of ultrafiltration system sets 93%,
It is used to remove the polluter such as partial suspended thing in waste water as the pretreatment system of embrane method concentration.
5th, ultrafiltration production water enters ion exchange system, and ion exchange system uses macropore sodium form weak acid positive resin, further
Remove calcium ions and magnesium ions.
6th, ion exchange system enters nanofiltration system, and sulfate concentration is more than 50000mg/L, nanofiltration in the concentrated water after concentration
The concentrated water of system enters salt made from earth containing a comparatively high percentage of sodium chloride and separates membranous system, and production water enters first-stage reverse osmosis system, and the rate of recovery of first-stage reverse osmosis system is set
It is set to 60%.
7th, the concentrated water of salt made from earth containing a comparatively high percentage of sodium chloride separation membranous system enters the salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system of " MVR+ triple effect evaporations ", and production water is back to tune
Reprocessed in section pond.
8th, the concentrated water of first-stage reverse osmosis enters electrodialysis system, and production water enters two-stage reverse osmosis system, two-pass reverse osmosis system
The rate of recovery of system is set as 90%, and the concentrated water of two-pass reverse osmosis is back to first-stage reverse osmosis and reprocessed, the production water of two-pass reverse osmosis
Reuse.
9th, the concentrated water of electrodialysis system enters deamination MVR evaporation and crystallization systems, and light salt brine is back to first-stage reverse osmosis system and entered
Row reprocessing；2-3t/h Recycling Mother Solution is arranged surely during deamination MVR evaporation and crystallization systems are controlled with salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system.
10th, the water quality situation of final recycle-water is as shown in table 3；The quality of final sodium chloride and anhydrous sodium sulfate crystal salt is such as
Shown in table 4.
The quality of reused water of table 3
The sodium chloride of table 4 and sulfate crystal salt quality
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, it is any without
The change or replacement that creative work is expected are crossed, should be all included within the scope of the present invention.Therefore, protection of the invention
Scope should be determined by the scope of protection defined in the claims.
Claims (10)
1. a kind of containing wastewater from catalyst zero-emission and recycling recycle integrated treatment process, it is characterised in that including following place
Manage step：
（1）Catalyst production waste water is emitted into balancing tank and stopped more than 20 hours, for adjusting catalyst comprehensive wastewater
Water quality and quantity；
（2）Balancing tank water outlet after pump is lifted enter efficiently softening remove system on silicon, remove waste water in part hardness, basicity,
Silica, suspension, organic matter, etc. polluter；
（3）Efficiently softening enters media filtration system except system on silicon produces water, for removing the pollutant such as partial suspended thing in waste water
Matter；
（4）Media filtration system production water enters ultrafiltration system, further removes suspension, colloid, bacterium in waste water etc. and pollutes
Material；
（5）Ultrafiltration system production water enters ion exchange system, further removes calcium ions and magnesium ions；
（6）Ion exchange system production water enters nanofiltration system, and waste water is separated into based on sodium sulphate by the effect of NF membrane
Concentrated water and production water based on sodium chloride, concentrated water enters step（7）Processing, production water enters step（8）Processing；
（7）Step（6）Concentrated water after processing enters salt made from earth containing a comparatively high percentage of sodium chloride and separates membranous system, and monovalent ion is removed by the effect of salt made from earth containing a comparatively high percentage of sodium chloride seperation film
And sodium sulfate concentration is further improved as concentrated water, into salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system, i.e. step（12）Processing, salt made from earth containing a comparatively high percentage of sodium chloride point
Step is mixed into from the production water of membranous system and nanofiltration production water（8）Processing；
（8）Step（6）Production water after processing enters first-stage reverse osmosis system, by the inspissation of first-stage reverse osmosis film by waste water
In sodium chloride concentration improve as concentrated water, into step（9）Processing, first-stage reverse osmosis production water enters step（10）Processing；
（9）Step（8）Concentrated water after processing enters electrodialysis system, passes through the work of anions and canons exchange membrane in electrodialysis plant
Further improved to more than 23% with by the sodium chloride mass concentration in the concentrated water, high strong brine is formed, into step（11）Place
Reason, while the light salt brine that electrodialysis system can be also formed after desalination, is back to step（8）Processing；
（10）Step（8）Production water after processing enters two-stage reverse osmosis system, is separated again by the effect of two-pass reverse osmosis film
For concentrated water and production water, the concentrated water of two-stage reverse osmosis system is back to step（8）Processing, the production water of two-stage reverse osmosis system enters reuse
Water tank；
（11）Step（9）High strong brine and step after processing（12）In a part of mother liquor enter deamination evaporation and crystallization system,
It is the supersaturated mother liquor of sodium chloride to be concentrated by evaporation after deamination, is partly into crystallizer formation sodium chloride crystal salt, is partly into
Step（12）Transported to outside the condensate liquid formed in processing, evaporation process and use water spot；
（12）Step（7）Concentrated water and step after processing（11）In a part of mother liquor enter salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system, evaporation
Crystallization forms anhydrous sodium sulfate crystalline salt, while a part of mother liquor of salt made from earth containing a comparatively high percentage of sodium chloride coproduction vapo(u)rization system enters step（11）Deamination steam
Send out crystal system.
2. handling process according to claim 1, it is characterised in that step（2）In efficient softening except system on silicon react
The upflow velocity that area is set is 5-10m/h, and efficiently softening is except system on silicon reaction zone addition magnesium chloride is as desiliconizing agent, and adjusts
PH reaches 10.5-11.5；Efficiently softening is except system on silicon setting device for collecting ammonia gas, and ammonia is led into absorption tower.
3. handling process according to claim 1, it is characterised in that step（4）In the ultrafiltration system rate of recovery be set as
90%-93%, membrane material preferentially selects PVDF.
4. handling process according to claim 1, it is characterised in that step（5）In ion exchange system use macropore
Sodium form weak acid positive resin, the regeneration of resin makes the transition for acid regeneration alkali, and the regenerative wastewater of ion exchange system is back to regulation
Pond.
5. handling process according to claim 1, it is characterised in that step（6）Sulfate is dense in middle nanofiltration system concentrated water
Degree is more than 50000mg/L.
6. handling process according to claim 1, it is characterised in that step（7）In salt made from earth containing a comparatively high percentage of sodium chloride separation retaining molecular weight
For 150-300 dalton, the rejection to sulfate radical is more than 99%；Concentrated water TDS is more than 180000mg/ in salt made from earth containing a comparatively high percentage of sodium chloride separation membranous system
L。
7. handling process according to claim 1, it is characterised in that step（8）In first-stage reverse osmosis system recovery
Rate is set as 50%-70%；Step（10）In the rate of recovery of two-stage reverse osmosis system be set as 80%-90%.
8. handling process according to claim 1, it is characterised in that step（9）In electrodialysis system using it is homogeneous cloudy,
The mass concentration of sodium chloride is more than 23% in cation-exchange membrane, the high strong brine ultimately formed.
9. handling process according to claim 1, it is characterised in that step（11）Middle deamination vapo(u)rization system is de- using stripping
A part of mother liquor is drained into step in ammonia and evaporation integral equipment, evaporation and crystal process（12）Salt made from earth containing a comparatively high percentage of sodium chloride combined production of crystallized system.
10. handling process according to claim 1, it is characterised in that step（12）Middle salt made from earth containing a comparatively high percentage of sodium chloride coproduction evaporation and crystal process
Processing parameter setting is that pH value is 12 in the technique of middle use MVR+ multiple-effect evaporations, evaporation process；Salt made from earth containing a comparatively high percentage of sodium chloride coproduction evaporative crystallization mistake
A part of mother liquor is back to step in journey（11）Deamination evaporation and crystallization system.
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