CN103387297A - Hydrofluoric acid wastewater reuse technology - Google Patents
Hydrofluoric acid wastewater reuse technology Download PDFInfo
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- CN103387297A CN103387297A CN2012101449714A CN201210144971A CN103387297A CN 103387297 A CN103387297 A CN 103387297A CN 2012101449714 A CN2012101449714 A CN 2012101449714A CN 201210144971 A CN201210144971 A CN 201210144971A CN 103387297 A CN103387297 A CN 103387297A
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- water
- reverse osmosis
- waste water
- wastewater
- stage reverse
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention discloses a hydrofluoric acid wastewater reuse technology. The technology allows about 60% of hydrofluoric acid wastewater to be reused, and the reused water to be approximate to pure water and to be directly reused for a technologic water system, so the reused wastewater can be recycled in the plant area. The technology sequentially comprises the following steps: adjusting the pH value of wastewater to 2.4-2.6, allowing the wastewater to go through a corrosion resistant filter to remove a small amount of suspensions possibly residual in the wastewater, allowing the filtered wastewater to enter a primary reverse osmosis system in order to remove silicates and amphoteric substances in the wastewater, adjusting the pH value of the outlet water of the primary reverse osmosis system, allowing the outlet water to enter a primary reverse osmosis collection system, supercharging through a secondary high pressure pump, allowing the supercharged water to go through a secondary reverse osmosis system for fluorine and salt removal treatment, allowing the produced water to enter a secondary reverse osmosis water collection system for collection, and allowing the water to go through a supercharging pump for rising and reuse.
Description
Technical field
Patent of the present invention relates to a kind of hydrofluoric acid waste water recycling process.
Background technology
Photovoltaic industry is develop rapidly in recent years, it is a Chaoyang industry, yet this is also a highly energy-consuming, high pollution, the great industry of water consumption, take the 100MW polycrystalline silicon production line as example, every day water consumption 1500 tons of left and right, fluoride waste accounts for 70% left and right of waste water total amount in the waste water that produces, waste water rinses silicon chip by high purity water and produces, general PH is between 2-3, and content of fluoride ion is generally between 50-800ppm, and electricity is led between 2000-4000us/cm.
Exemplary process method for this waste water is the precipitator method at present, and its ultimate principle is:
Ca
2++2F
-＝CaF
2↓
As following formula, Xiang Shuizhong adds CaCl
2Or other calcium salts, make Ca
2+Generate CaF with the F reaction in water
2Precipitation, thus F-is removed from water.This technique is maturation process, general final discharge water content of fluoride ion can be controlled at 6-10mg/L, can guarantee qualified discharge, yet waste water composition in source own is comparatively single, but a large amount of calcium, magnesium ion etc. have artificially been introduced in this technological process, the quality that this not only greatly reduces the further reuse water outlet of waste water, reduced the rank of waste water recycling, and more this waste water recycling has increased difficulty and risk.
Rare hydrogen fluorine waste water that the sector produces, have that pH value is low, corrodibility is strong, electricity is led high characteristics, this has increased the difficulty of processing undoubtedly, but the characteristic that its turbidity is low, hardness is low, composition is relatively single in the waste water art breading new for we adopt and reuse this waste water provide new thinking and may.
The patent of invention content
The purpose of patent of the present invention is to provide a kind of novel process of hydrofluoric acid wastewater treatment, this technique not only can be with hydrofluoric acid waste water recycling approximately 60%, and the rank of reuse water can reach approximate pure water rank, and direct reuse is to the process water system, and the waste water of reuse is recycled in plant area.
The hydrofluoric acid waste water recycling process of patent of the present invention comprises the following steps successively:
At first the pH value in waste water is adjusted to 2.4-2.6, afterwards after a small amount of suspended substance that may be remaining in corrosion resistant more medium filter removal waste water, enter the first-stage reverse osmosis system and remove silicate and amphiprotic substance in waste water, the water outlet of first-stage reverse osmosis system enters the first-stage reverse osmosis gathering system after PH regulates, carry out two-stage reverse osmosis system again after the supercharging of secondary high-pressure pump, carrying out the defluorinate desalination through two-stage reverse osmosis system processes, produce water and enter collection in the two-pass reverse osmosis water collection system, and reuse after promoting by topping-up pump.
Further, the pH value that enters the waste water of first-stage reverse osmosis gathering system is stabilized in 8-9.
Further, the product water PH of described two-stage reverse osmosis system is stabilized in 7, and content of fluoride ion is stabilized in below 5ppm, and electricity is led and is stabilized in below 20us/cm.
compare with existing Technology, the beneficial effect of patent of the present invention is: the technique thinking of patent of the present invention is different from traditional fluorine Waste Water Treatment fully, its operational path is that waste water is adjusted to 2.5 left and right through PH preconditioning system with PH, enter first-stage reverse osmosis technique after a small amount of suspended substance that may be remaining in corrosion resistant more medium filter removal water, first-stage reverse osmosis clearance to fluorion under low pH value is lower, yet very high for clearances such as existing macromolecular silicate in water, the process first-stage reverse osmosis can effectively be removed silicate and the amphiprotic substance in water, the water outlet of first-stage reverse osmosis technique enters two-stage PH regulating tank and regulates the pH value of water, regulate through two-stage PH, the waste water pH value is stabilized between 8-9, then carrying out the defluorinate desalination through two-stage reverse osmosis system processes, the product water PH of two-pass reverse osmosis is stabilized in 7 left and right, content of fluoride ion is stabilized in below 5ppm, electricity is led and is stabilized in below 20us/cm, but direct reuse uses as its former water in pure water making system.
It is the water quality that water quality is better than tap water that the effect of patent of the present invention shows as the aftertreatment of this technique of fluoride waste process, but direct reuse uses the water cycle of on-site in pure water making system, reduces wastewater emission amount, the water saving cost.
Description of drawings
Fig. 1 is the structure flow chart of embodiment hydrofluoric acid waste water recycling process.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation patent of the present invention, but are not used for limiting the scope of patent of the present invention.
Embodiment 1
as shown in Figure 1, a kind of hydrofluoric acid waste water recycling process, comprise wastewater collection pond 1, pre-treatment pond 2, one-level high-pressure pump 3, first-stage reverse osmosis system 4, secondary high-pressure pump 5 and two-stage reverse osmosis system 6, be communicated with by the first transfer line 11 between wastewater collection pond 1 and pre-treatment pond 2, the first transfer line 11 is provided with fluorine waste water transferpump 6, the downstream of the first transfer line 11 is communicated with one-level high-pressure pump 3 by the second transfer line 12, the second transfer line 12 is provided with activated charcoal filter 7 and cartridge filter 8, the downstream of one-level high-pressure pump 3 is provided with first-stage reverse osmosis system 4 successively, PH regulating tank 9, secondary high-pressure pump 5, two-stage reverse osmosis system 6 and secondary RO produce water collection tank 10, water through cartridge filter 8 enters first-stage reverse osmosis system 4 by one-level high-pressure pump 3, PH regulating tank 9 is positioned at the downstream part of first-stage reverse osmosis system 4, water after adjusting PH enters collects water tank 13, collect water tank 13 water outlets and enter two-stage reverse osmosis system 6 after 5 superchargings of secondary high-pressure pump, after two-pass reverse osmosis is processed, enter secondary RO and produce water collection tank 10 collections.
The first-stage reverse osmosis system is comprised of high-pressure pump, putamina, membrane element, pipeline valve and corresponding instrument, the high-pressure pump material is for special dual phase steel 2205 materials of this technique, membrane element is the anti-acid polyamide composite film element that is suitable under the customized low pH value of Hydranautics company, during the operation of first-stage reverse osmosis system, enter putamina by high-pressure pump after with the hydrofluoric acid waste water supercharging, desalting treatment by reverse osmosis membrane, infiltration water enters first-stage reverse osmosis and produces water collection system, dense water by row of conduits to the fluorine Waste Water Treatment.It is emphasized that, because pH value is lower, the first-stage reverse osmosis system ratio of desalinization of this technique is lower, lead by 4000-5000 and be reduced to 2000-3000 by the former water power of this technique, clearance 50% left and right, but the clearance to silicon compound in waste water reaches more than 90%, and the amphiprotic substance in waste water will be removed like this, the consumption of sodium hydroxide when effectively reducing waste water and regulate pH value.
The PH regulation system is comprised of a PH surge tank, the 2nd PH surge tank, agitator, PH meter, NaOH chemicals dosing plant.the first-stage reverse osmosis system is produced water and is at first entered a PH surge tank, PH meter in surge tank detects waste water pH value in water tank, this pH value data transmission is to PLC, the PLC system is according to predefined data-guiding NaOH Automatic Dosing valve opening and closing, add NaOH solution with automated manner in surge tank, the one PH surge tank enters the 2nd PH surge tank after the waste water pH value is adjusted to 4-6, in the 2nd PH surge tank, the PH regulative mode is identical with a PH surge tank, but more accurate than a PH surge tank, the 2nd PH surge tank goes out water ph value and is stabilized between 8-9, enter first-stage reverse osmosis and produce water collection tank.
Two-stage reverse osmosis system is comprised of secondary high-pressure pump, putamina, membrane element, pipeline valve and corresponding instrument, the secondary high-pressure pump enters putamina after with the water supercharging in the first-stage reverse osmosis collection box, desalting treatment by reverse osmosis membrane, infiltration water enters two-pass reverse osmosis and produces water collection system, dense water by row of conduits to the fluorine Waste Water Treatment.
The technical process of patent hydrofluoric acid waste water recycling process of the present invention is as follows:
fluorine waste water is collected in the wastewater collection pond, flow to PH preconditioning pond by fluorine waste water transferpump, mode by adding NaOH in PH preconditioning pond with the pH value of former water by being adjusted to 2.5 left and right between 1-2, former water after adjusting enters the pre-treatment pond in the mode of overflow, supercharging by raw water pump, former water enters high-pressure pump after activated charcoal filter and cartridge filter, the former water of further supercharging by high-pressure pump enters the first-stage reverse osmosis system, the dense water of first-stage reverse osmosis directly is disposed to Waste Water Treatment and processes, first-stage reverse osmosis produces the pH value of water generally in 2 left and right, enter in two-stage PH equalizing tank and regulate pH value, pH value is adjusted between 8-9, water after adjusting PH enters the collection water tank, collect the water tank water outlet and enter two-stage reverse osmosis system after the supercharging of secondary high-pressure pump, after advancing the two-pass reverse osmosis processing, produce water and reach reuse standard, enter secondary RO and produce the water collection tank collection.
The above is only the preferred implementation of patent of the present invention; should be understood that; for those skilled in the art; under the prerequisite that does not break away from patented technology principle of the present invention; can also make some improvement and modification, these improve and modification also should be considered as the protection domain of patent of the present invention.
Claims (3)
1. a hydrofluoric acid waste water recycling process, is characterized in that, comprises the following steps successively:
At first the pH value in waste water is adjusted to 2.4-2.6, afterwards after a small amount of suspended substance that may be remaining in corrosion resistant more medium filter removal waste water, enter the first-stage reverse osmosis system and remove silicate and amphiprotic substance in waste water, the water outlet of first-stage reverse osmosis system enters the first-stage reverse osmosis gathering system after PH regulates, carry out two-stage reverse osmosis system again after the supercharging of secondary high-pressure pump, carrying out the defluorinate desalination through two-stage reverse osmosis system processes, produce water and enter collection in the two-pass reverse osmosis water collection system, and reuse after promoting by topping-up pump.
2. hydrofluoric acid waste water recycling process according to claim 1, it is characterized in that: the pH value that enters the waste water of first-stage reverse osmosis gathering system is stabilized in 8-9.
3. hydrofluoric acid waste water recycling process according to claim 1, it is characterized in that: the product water PH of described two-stage reverse osmosis system is stabilized in 7-8, and content of fluoride ion is stabilized in below 5ppm, and electricity is led and is stabilized in below 20us/cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101449714A CN103387297A (en) | 2012-05-11 | 2012-05-11 | Hydrofluoric acid wastewater reuse technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101449714A CN103387297A (en) | 2012-05-11 | 2012-05-11 | Hydrofluoric acid wastewater reuse technology |
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| CN103387297A true CN103387297A (en) | 2013-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105712542A (en) * | 2016-04-22 | 2016-06-29 | 天津特立环保科技有限公司 | Hydrofluoric acid wastewater recycling treatment device for photovoltaic and semiconductor industries and technology thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002143850A (en) * | 2000-11-15 | 2002-05-21 | Hitachi Zosen Corp | Device for treating waste water |
| CN102126798A (en) * | 2011-01-17 | 2011-07-20 | 无锡德宝水务投资有限公司 | Method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry |
-
2012
- 2012-05-11 CN CN2012101449714A patent/CN103387297A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002143850A (en) * | 2000-11-15 | 2002-05-21 | Hitachi Zosen Corp | Device for treating waste water |
| CN102126798A (en) * | 2011-01-17 | 2011-07-20 | 无锡德宝水务投资有限公司 | Method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry |
Non-Patent Citations (1)
| Title |
|---|
| 柳雨: "不锈钢酸洗废液的回收和处理技术", 《世界钢铁》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105712542A (en) * | 2016-04-22 | 2016-06-29 | 天津特立环保科技有限公司 | Hydrofluoric acid wastewater recycling treatment device for photovoltaic and semiconductor industries and technology thereof |
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Application publication date: 20131113 |