CN103693771A - Multi-stage cascaded drinking water adsorption defluorination device and method - Google Patents
Multi-stage cascaded drinking water adsorption defluorination device and method Download PDFInfo
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- CN103693771A CN103693771A CN201210373484.5A CN201210373484A CN103693771A CN 103693771 A CN103693771 A CN 103693771A CN 201210373484 A CN201210373484 A CN 201210373484A CN 103693771 A CN103693771 A CN 103693771A
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Abstract
The invention discloses a multi-stage cascaded drinking water adsorption defluorination device and a method for adsorption defluorination by the device. The device provided by the invention adopts a multi-stage cascaded adsorption process, the effective adsorption amount of an adsorbent is enhanced by more than 1 time, and the water output of the system is increased by 1 time. Acid adding is employed to adjust the pH value of a water inlet, and column effluent and raw water are blended, so that a modified activated alumina adsorbent can be ensured to operate under optimal adsorption conditions, and a stable effluent pH value can be obtained, but also the effective adsorption amount of the adsorbent can be enhanced by more than 3 times, and the water output of the system can be enhanced by over 3 times. A ferric salt is employed to modify activated alumina particles, and the aluminum ion dissolution risk can be avoided during optimizing the adsorption condition operation.
Description
Technical field
The present invention relates to a kind of plural serial stage tap water adsorption-defluorination device and use this device to carry out the method for adsorption-defluorination, belong to drink water purifying technical field and fractionation by adsorption field.
Background technology
Human body is taken in appropriate fluorine, useful to skeleton development and dental health.But the fluorine of taking in is excessive, can cause the sufferers such as dental fluorosis, osteofluorosis to occur, the serious patient that even causes paralyses.The absorption of fluorine is mainly derived from tap water, and in the drinking water sources in current a lot of areas at home and abroad, fluorine content all surpasses health standards, even surpasses tens times of health standards, therefore to the very large demand of drinking water defluorination existence.
Fluorine mainly exists with fluorion form in tap water.Removal method to fluorine in water is a lot, but is satisfied with safe, economical, the effective defluorination method first-elected absorption method of drinking water standard.The most frequently used drinking water defluorination technique is activated alumina adsorption-defluorination at present, and its typical process is seed activity alumina adsorption filter tank.For avoiding the saturated regeneration of the sorbent material stage to cause water outlet to be interrupted, conventional adsorption-defluorination process arranges multicolumn absorption-desorb alternate run (see figure 1) more.Modified flow can provide more water flow and higher adsorption column utilising efficiency (see figure 2) for multicolumn parallel-connection flow.For promoting the adsorption effect of sorbent material, seed activity aluminum oxide often soaks modification with alum liquor.Under slant acidity condition, loading capacity is large, adsorption rate is very fast for activated alumina adsorbents, for adsorption operations is operated in, optimizes under absorption working condition, and generally the inlet segment acid adding at adsorption unit regulates water inlet pH value.
Technique has the following disadvantages at present: owing to adopting Tai-Ace S 150 modified activated aluminum oxide sorbent material, and this sorbent material is optimized under adsorption conditions and is worked in slant acidity, be easy to the aluminum ion stripping of adsorbent surface in water body, cause water body aluminum ion to exceed standard, and aluminum ion have chronic neuron excitotoxicity effect to human body.Because the water outlet fluorine concentration of tap water must meet drinking water standard, fluorine concentration requirement is less than 1mg/L, in the absorbing process of aforementioned conventional filter tank, for guaranteeing that water outlet fluorine concentration is less than 1mg/L, due to the corresponding absorption of equilibrium concentration quantitative limitation, the adsorptive capacity of sorbent material is lower.
Summary of the invention
For overcoming the above deficiency of existing defluorinating process, the present invention adopts plural serial stage tandem type adsorption-defluorination technique, and intake acid adding, water outlet blending method, improves the aquifer yield of adsorption unit; And adopt modification with Fe seed activity alumina adsorbant, guarantee optimizing under adsorption conditions, the indices of water outlet meets drinking water standard.In order to realize object of the present invention, intend adopting following technical scheme:
One aspect of the present invention relates to a kind of adsorption filtration device of drinking water defluorination, it is characterized in that comprising as lower member:
1) the adsorption filtration system that multicolumn is connected in series, described series connection progression is more than 2 and 2, is preferably 2 to 5 grades; In described adsorption column, be mounted with modification with Fe granule adsorbent;
2) water-in of adsorption filtration system comprises water inlet pipe and acid adding adjustable pipe;
3) water outlet of adsorption filtration system is connected with former water water pipe, and rising pipe is provided with fluorine content detection device.
In a preferred embodiment of the present invention, wherein said sorbent material is the activated alumina of particle diameter 0.5-3.0mm.
In a preferred embodiment of the present invention, wherein said molysite is ferric sulfate and/or bodied ferric sulfate.
In a specific embodiment of the present invention; the preparation method of described modification with Fe granule adsorbent is as follows: by after seed activity filling device; with after clear water filtration and washing filtrate; with bodied ferric sulfate and/or ferric sulfate aqueous solution circulating filtration; then the iron salt solutions of draining; with clear water, rinse filtrate, obtain modification with Fe sorbent material.
In a preferred embodiment of the present invention, described filtration unit also comprises adsorption column regeneration system rapidly.
The present invention also relates on the other hand and uses the adsorption filtration device of above-mentioned drinking water defluorination to carry out the method for drinking water defluorination, it is characterized in that comprising the steps: to regulate the flow of water inlet pipe and acid adding adjustable pipe, and regulating the pH value of water inlet is 5.0-7.0; According to the detected result of the fluorine content detection device on rising pipe, regulate the ratio of blending of former water and water outlet, it is 0.0 to 5.0 that ratio range is blent in the water outlet of former water/post.
In a preferred embodiment of the present invention, the detected result that it is characterized in that the fluorine content detection device on the rising pipe reaches fluorine content in drinking water standard upper in limited time, the 1st grade of adsorption column is written into regeneration system rapidly regenerates, the standby adsorption column of having regenerated is connected in series to the last step of adsorption filtration system, and water-in is adjusted on the 2nd grade of adsorption column, continue running gear until the detected result of the fluorine content detection device on rising pipe reaches the upper limit of fluorine content in drinking water standard, repeat the regenerative operation of above-mentioned adsorption column.
In a preferred embodiment of the present invention, it is characterized in that described method also comprises the step of the iron level and/or the aluminium content that detect water outlet.
In a preferred embodiment of the present invention, the adsorption filtration speed that it is characterized in that described method is 2.0-8.0 per hour times bed volume.
In the present invention, multicolumn series connection tap water adsorption-defluorination overall system schema is as Fig. 4, and the former water of high fluorine regulates by acid adding, adsorption column water inlet is adjusted to the pH scope of optimization, and optimization water inlet pH scope of the present invention is 5.0-7.0.
In a preferred embodiment of the present invention, will take three post tandem process as example explanation, its exemplary flow is as Fig. 3.Water inlet is in turn by modified activated aluminum oxide adsorption column A, B, C.According to the fluorine concentration ratio r of the water outlet fluorine concentration of adsorption column C and the water inlet of high fluorine, regulate the ratio of the blending R of the former water of high fluorine and the water outlet of C post, the system water outlet of making meets drinking water standard.Blend ratio R with the fluorine change in concentration of high fluorine water inlet, when high fluorine influent concentration scope is during at 1.2-10.0 mg/L, blend ratio R span 5.0-0.0.
When C post water outlet fluorine concentration reaches in drinking water standard, prescribe a time limit, A post is switched to desorb-regeneration mode; Water inlet is switched to B post, and the water outlet of C post is switched to the adsorption column D of new desorption and regeneration, and the water outlet of D post and Yuan Shui blend rear as system water outlet.Saturated-desorption and regeneration circulation that above A, B, C, D post alternately adsorb, the adsorption column after regeneration is used as new adsorption column.
The sorbent material adopting is metal-salt modified particles activated alumina adsorbents, particularly adopts the seed activity alumina adsorbant of modification with Fe, particle diameter 0.5-3.0mm.
Processing condition of the present invention are as follows: different according to high fluorine water inlet fluorine concentration, series connection adsorption column number be take 2-4 as good, adsorption filtration speed 2.0-8.0 times/h; Adopt modification with Fe seed activity alumina adsorbant, grain diameter 0.5-3.0mm; The former water acid adding of high fluorine regulates water inlet pH value 5.0-7.0; The ratio of the blending 5.0-0.0 of former water and adsorption column water outlet.
During adsorption-defluorination device of the present invention and adsorption-defluorination method at least have the following advantages one or all:
1, adopt plural serial stage adsorption-defluorination technique, greatly improve the adsorption efficiency of sorbent material, the accumulation adsorptive capacity of sorbent material improves more than 1 times;
2, adopt the adjusting of water inlet acid adding, water outlet and Yuan Shui to blend mode, improve the accumulation adsorptive capacity of sorbent material more than 3 times, and make single adsorption-regeneration recycle water yield raising more than 3 times;
3, adopt modification with Fe seed activity alumina adsorbant, ensure that water outlet meets drinking water standard under the lower optimization adsorption conditions of water inlet pH value.
Accompanying drawing explanation
Fig. 1: twin columns replace absorption-desorption schematic diagram;
Fig. 2: three posts absorption-desorption schematic diagram in parallel;
Fig. 3: three post series connection absorption-desorption schematic diagram;
Fig. 4: complete process flow figure;
Fig. 5: the penetration volume of three pillar type absorption improves;
Fig. 6: regulate the penetration volume of water inlet pH value to improve.
Embodiment
Seed activity aluminum oxide is packed into after device; with after filtration and washing filtrate of 3 times of volume clear water, use 2 times of volumes, 2% bodied ferric sulfate aqueous solution circulating filtration 0.5h instead, the iron salt solutions of then draining; with 5 times of volume clear water, rinse filtrate, obtain modification with Fe sorbent material.Adopt three post series process flows, at water inlet fluorine content 5.0mg/L, water inlet pH=7.5, under 2.0 times/h of filtering velocity condition, compares with single-column absorption, and the average single-column aquifer yield of three posts series connection absorption increases by 1 times (seeing Fig. 5), and water outlet up to standard is 640 times of column volumes.Water outlet aluminum ion maximum concentration 0.04mg/L, iron ion does not detect, all lower than drinking water standard 0.20mg/L limit value, water outlet pH=7.3, water quality meets national hygiene standard for drinking water.
The sorbent material identical with embodiment 1, the operation of employing single-column, water inlet adds acid for adjusting pH value mode, at water inlet fluorine content 5.0mg/L, water inlet pH=6.2, under 1.8 times/h of filtering velocity condition, does not compare with regulating pH=7.5 flow condition, after regulating pH value, single-column aquifer yield increases by 1.1 times of (see figure 6)s, and water outlet up to standard is 720 times of column volumes.Water outlet aluminum ion maximum concentration 0.15 mg/L, iron ion maximum concentration 0.04 mg/L, all lower than drinking water standard 0.20mg/L limit value, water outlet pH=6.8, water quality meets national hygiene standard for drinking water.
embodiment 3
The sorbent material identical with embodiment 1, adopts three post series process flows, and water inlet adds acid for adjusting pH value mode, at water inlet fluorine content 5.0mg/L, and water inlet pH=6.2, under 3.0 times/h of filtering velocity condition, water outlet up to standard is 1130 times of column volumes.Aluminum ion maximum concentration 0.05 mg/L of water outlet, iron ion maximum concentration 0.01 mg/L, all lower than drinking water standard 0.20mg/L limit value, water outlet pH=6.7, water quality meets national hygiene standard for drinking water.
Seed activity aluminum oxide is packed into after device, with after filtration and washing filtrate of 3 times of volume clear water, uses 2 times of volumes, 2% ferric sulfate aqueous solution circulating filtration 0.5h instead, the iron salt solutions of then draining, rinses filtrate with 5 times of volume clear water, obtains modification with Fe sorbent material.Adopt three post series process flows, water inlet adds acid for adjusting pH value, and water outlet and former water section are blent mode, at water inlet fluorine content 5.0mg/L, and water inlet pH=6.5, under 2.0 times/h of filtering velocity condition, water outlet up to standard is 1440 times of column volumes.Maximum concentration 0.16 mg/L, iron ion maximum concentration 0.05 mg/L, all lower than drinking water standard 0.20mg/L limit value, water outlet pH=6.6, water quality meets national hygiene standard for drinking water.
When understanding, above-mentioned embodiment is only illustrative explanation, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (8)
1. an adsorption filtration device for drinking water defluorination, is characterized in that comprising as lower member:
1) the adsorption filtration system that multicolumn is connected in series, described series connection progression is more than 2 and 2, is preferably 2 to 5 grades; In described adsorption column, be mounted with modification with Fe granule adsorbent;
2) water-in of adsorption filtration system comprises water inlet pipe and acid adding adjustable pipe;
3) water outlet of adsorption filtration system is connected with former water water pipe, and rising pipe is provided with fluorine content detection device.
2. the adsorption filtration device of drinking water defluorination according to claim 1, wherein said sorbent material is the activated alumina of particle diameter 0.5-3.0mm.
3. the adsorption filtration device of drinking water defluorination according to claim 1, wherein said molysite is ferric sulfate and/or or bodied ferric sulfate.
4. according to the adsorption filtration device of the drinking water defluorination described in claim 1-3 any one, described filtration unit also comprises adsorption column regeneration system rapidly.
5. the device described in right to use requirement 1-4 any one carries out the method for drinking water defluorination, it is characterized in that comprising the steps: to regulate the flow of water inlet pipe and acid adding adjustable pipe, and regulating the pH value of water inlet is 5.0-7.0; According to the detected result of the fluorine content detection device on rising pipe, regulate the ratio of blending of former water and water outlet, it is 0.0 to 5.0 that ratio range is blent in the water outlet of former water/post.
6. method according to claim 5, the detected result that it is characterized in that the fluorine content detection device on the rising pipe reaches fluorine content in drinking water standard upper in limited time, the 1st grade of adsorption column is written into regeneration system rapidly regenerates, the standby adsorption column of having regenerated is connected in series to the last step of adsorption filtration system, and water-in is adjusted on the 2nd grade of adsorption column, continue running gear until the detected result of the fluorine content detection device on rising pipe reaches the upper limit of fluorine content in drinking water standard, repeat the regenerative operation of above-mentioned adsorption column.
7. method according to claim 6, characterized by further comprising and detect the iron level of water outlet and/or the step of aluminium content.
8. according to the method described in claim 5-8 any one, it is characterized in that adsorption filtration speed is 2.0-8.0 per hour times bed volume.
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Cited By (5)
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| CN106000281A (en) * | 2016-06-08 | 2016-10-12 | 李明宇 | Modified activated aluminum oxide with high fluoride ion adsorption capability, and preparation method thereof |
| CN108423737A (en) * | 2017-02-15 | 2018-08-21 | 株式会社久保田 | Method for treating water and water treatment system |
| CN109078608A (en) * | 2018-08-31 | 2018-12-25 | 中国环境科学研究院 | Arsenic-removing adsorption agent and preparation method and application based on iron modified activated aluminum oxide |
| CN114291914A (en) * | 2020-12-23 | 2022-04-08 | 吴植仁 | Novel sewage treatment process using self-produced peat as adsorbent and method for measuring carbon-water ratio |
| CN114314951A (en) * | 2020-08-25 | 2022-04-12 | 深圳市长隆科技有限公司 | Method for removing fluorine ions in wastewater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108423737A (en) * | 2017-02-15 | 2018-08-21 | 株式会社久保田 | Method for treating water and water treatment system |
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| CN114314951A (en) * | 2020-08-25 | 2022-04-12 | 深圳市长隆科技有限公司 | Method for removing fluorine ions in wastewater |
| CN114291914A (en) * | 2020-12-23 | 2022-04-08 | 吴植仁 | Novel sewage treatment process using self-produced peat as adsorbent and method for measuring carbon-water ratio |
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