CN1421404A - Drinking water defluorinating process and equipment - Google Patents
Drinking water defluorinating process and equipment Download PDFInfo
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- CN1421404A CN1421404A CN 01140144 CN01140144A CN1421404A CN 1421404 A CN1421404 A CN 1421404A CN 01140144 CN01140144 CN 01140144 CN 01140144 A CN01140144 A CN 01140144A CN 1421404 A CN1421404 A CN 1421404A
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Abstract
The present invention relates to drinking water defluorinating process and equipment. One combined technological process is used, coagulating and precipitating process is first adopted to eliminate most fluoride in water and adsorbing process with adsorber is then adopted to make the fluoride content in water reach relevant national standard. The present invention has greatly reduced subsequent adsorbent regenerating times, long adsorbent life and low water treating cost and may find its important application in processing high-concentration fluoric drinking water.
Description
What the present invention relates to is defluorinating process and device about containing fluorine drinking water
Fluorine be distributed in nature very widely, chemical property one of the most active element, it is a kind of trace element of needed by human body.Under normal conditions, the fluorine that human body is taken in from the external world is too much or not enough, all can affect the healthy of people.Drinking Water in China hygienic standard regulation, fluorine content must not surpass 1.0 mg/litre in the tap water.The fluorine-containing higher water of long-term drinking causes fluorine excess accumulation in vivo, will cause chronic fluorosis.Endemic fluorine poisoning has a very wide distribution in China, and is especially serious at dry area in north china.In addition, high fluorine waste water that electron trade produces and the fluoride waste that uses smeltery, phosphate fertilizer plant and the fuel-burning power plant smoke evacuation wet purification of fluorine-containing raw material to form might pollute surface water body if deal with improperly also, and human body is worked the mischief.Therefore the processing to fluorine in the tap water is subject to people's attention day by day.
The defluorination method of present domestic tap water mainly contains following several: 1. coagulant sedimentation: the coagulating agent that coagulant sedimentation adopts, mostly be aluminium salt, by aluminium salt is added in the water, generate the cotton-shaped alumen ustum of aluminium hydroxide, under the effect of electric charge, the absorption fluorion is after cotton-shaped alumen ustum sinks, fluorine together with absorption sinks to the bottom, to reach the purpose that reduces fluorine content in the water.The characteristics of this method are that fluorine content is high more in the water, and loading capacity is big more.Therefore want fluorine content in the water is reduced to below the drinking water standard, must use a large amount of coagulating agent, the result causes water outlet pH on the low side, and sulfate radical content obviously increases, and the mud generation is too much, and the defluorination effect instability, and this method is seldom used at present.2. electroosmose process defluorination: electrodialyzer is to be formed by mutual arrangement of multilayer yin, yang ionic membrane.Under effect of electric field, utilize the yin, yang ion-exchange membrane that the water intermediate ion is optionally passed through, moisture becomes dense water and fresh water, and in the desalination process of water, but the fresh water zwitterion of supplying drinking water reduces the also corresponding reduction of fluorine content simultaneously.The electroosmose process defluorination is applicable to the water that 3mg/l is following, but this method defluorination current consumption is big, and dense water can not use, and the waste of water is also bigger.3. activated alumina defluorination: activated alumina is a kind of porous inorganic anionite, has bigger surface-area.Compare with other method, utilize activated alumina defluorination treatment effect more stable, it is a kind of method of using often at present, but the loading capacity of activated alumina is limited, when the fluorine content in the water is higher (greater than 2mg/l), it is big still to have usage quantity, the frequent problem of regenerating, the defluorination capacity of activated alumina is subjected to the influence of pH value in the water bigger simultaneously, treatment effect height under the condition of the condition of hanging down the pH value; Under the condition of high pH value under the condition of high pH value, treatment effect obviously descends.These have restricted the application of activated alumina widely.
At the shortcoming and defect that exists in the above-mentioned treatment process, propose the processing of employing coagulation and adsorption combined technology and contained fluorine drinking water and trade effluent, reach the purpose that purifies fluorinated water.
Advantage of the present invention is: the low expense of coagulation process and the high efficiency of adsorption method are combined, realized low-cost, defluorination efficiently.In precipitation process of coagulation, size according to fluorine content in the former water, select suitable and an amount of coagulating agent, can reduce the fluorine content of water, thereby reduced the load of adsorption tower widely, reduce the regeneration times of adsorption stuffing, prolonged the life-span of sorbent material, thereby reduced the processing cost of water.Combination process provided by the invention is not the simple combination of coagulant sedimentation and absorption method, but a kind of organic assembling of replenishing mutually, size for coagulative precipitation tank and adsorption tower scale, can determine according to the character of the selection of coagulating agent kind, coagulant charging quantity, sorbent material and the price of coagulating agent and sorbent material, the design and running of whole like this combination process can be selected according to actual needs neatly.
Technical solution of the present invention is to adopt fluorine-containing former water is injected the coagulative precipitation tank that has Automatic Dosing and stirring system by volume pump, the water outlet of coagulative precipitation tank is sent into the defluorination adsorption tower by volume pump, and the regeneration of adsorption stuffing is to be finished by regeneration system rapidly.Sterilization enters later water distribution system through sterilization equipment in the water outlet of adsorption tower.
Coagulative precipitation tank among the present invention by automatic control system to adding dose and control stirring velocity, fluorine content in the former water is reduced to below the 2mg/l, after handling through adsorption tower then the water outlet fluorine content is reached below the 1mg/l, the bacterium in the water is killed in the sterilization of process sterilization equipment again, water after then handling can enter water distribution system, and its process flow sheet is seen accompanying drawing 1.
Application example
Example 1: example 1 is one of embodiment of the present invention example, but this patent is not limited only to this.
Fluorine-containing underground water is handled as tap water in certain small water supplying supply station, and the processing water yield of every day is 100 tons, phreatic water quality situation: fluorine concentration is 4.68mg/l, and pH is 7.5～7.9.The coagulating agent that adopts in this example implementation process is a polymeric aluminum, dosage 5mg/l, sorbent material adopts the novel alumina adsorbant of modification, the sorbent material consumption is 1.5 tons, sorbent material 4-6 month with sodium hydroxide and hydrochloric acid soln regeneration once, but handle without combination process, the regeneration in 1 month of the sorbent material of adsorption treatment once increases working cost widely separately.After regeneration, sorbent material is gone up the adsorptive power of recovering original substantially, but partial loss is arranged in regenerative process, needs to replenish sorbent material 5～10% at every turn.Water quality after the process flow sheet of groundwater treatment (accompanying drawing 1), underground water are handled through combination process sees Table 1, the result from table as can be seen, fluoro-containing concentration＜1mg/l in the water after handling through this combination process.
The water quality situation of the fluorine-containing underground water of table 1 after combination process is handled
| Project | The water outlet of coagulative precipitation tank | The water outlet of adsorption tower |
| The concentration of fluorion (mg/l) | ????1.9 | ????0.8 |
Claims (4)
1. the defluorinating process of a tap water is characterized in that at least by coagulating sedimentation and two treatment steps of absorption.
2. the defluorinating process of a kind of tap water as claimed in claim 1, it is characterized in that utilizing inorganic aluminium is that coagulating agent carries out fluorinated water is carried out coagulating sedimentation, make handle the back water outlet fluorine content less than 2mg/l after, utilize a kind of sorbent material to carry out adsorption treatment.
3. the defluorinating process of a kind of tap water as claimed in claim 2, the sorbent material that adsorption process is used is a kind of activated alumina or a kind of material that contains rare earth element.
4. the fluorine removal device of a tap water is characterized in that being made up of the adsorption tower (2) of folded plate type coagulative precipitation tank (1), top water inlet and following water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01140144 CN1421404A (en) | 2001-11-27 | 2001-11-27 | Drinking water defluorinating process and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01140144 CN1421404A (en) | 2001-11-27 | 2001-11-27 | Drinking water defluorinating process and equipment |
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| CN1421404A true CN1421404A (en) | 2003-06-04 |
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| CN 01140144 Pending CN1421404A (en) | 2001-11-27 | 2001-11-27 | Drinking water defluorinating process and equipment |
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| CN (1) | CN1421404A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948378A (en) * | 2010-09-07 | 2011-01-19 | 湖州原正化学有限公司 | Process for removing fluorine from trifluoroacetic acid |
| CN101973656A (en) * | 2010-10-25 | 2011-02-16 | 中国市政工程中南设计研究总院 | Defluorinating process and device of domestic drinking water of villages and towns |
| CN102120657A (en) * | 2011-01-28 | 2011-07-13 | 姜雪 | Fluorine removing process and device for drinking water |
| CN101838042B (en) * | 2010-01-19 | 2012-09-26 | 合肥工业大学 | Preparation and regeneration method for water treatment defluoridation filter material based on natural mineral |
| CN103224301A (en) * | 2012-12-28 | 2013-07-31 | 中国科学院生态环境研究中心 | Method for removing fluorides in water based on complexation-condensation-adsorption combination |
| CN103274539A (en) * | 2012-12-28 | 2013-09-04 | 中国科学院生态环境研究中心 | Method for removing fluoride in drinking water by complexation-coacervation-adsorption with defluorination adsorption material based on aluminium base composite metal oxide |
| CN110015781A (en) * | 2019-04-30 | 2019-07-16 | 山东双科矿山科技有限公司 | A kind of high-effective defluorination method of coal mine well water |
-
2001
- 2001-11-27 CN CN 01140144 patent/CN1421404A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101838042B (en) * | 2010-01-19 | 2012-09-26 | 合肥工业大学 | Preparation and regeneration method for water treatment defluoridation filter material based on natural mineral |
| CN101948378A (en) * | 2010-09-07 | 2011-01-19 | 湖州原正化学有限公司 | Process for removing fluorine from trifluoroacetic acid |
| CN101973656A (en) * | 2010-10-25 | 2011-02-16 | 中国市政工程中南设计研究总院 | Defluorinating process and device of domestic drinking water of villages and towns |
| CN101973656B (en) * | 2010-10-25 | 2012-11-07 | 中国市政工程中南设计研究总院 | Defluorinating process and device of domestic drinking water of villages and towns |
| CN102120657A (en) * | 2011-01-28 | 2011-07-13 | 姜雪 | Fluorine removing process and device for drinking water |
| CN103224301A (en) * | 2012-12-28 | 2013-07-31 | 中国科学院生态环境研究中心 | Method for removing fluorides in water based on complexation-condensation-adsorption combination |
| CN103274539A (en) * | 2012-12-28 | 2013-09-04 | 中国科学院生态环境研究中心 | Method for removing fluoride in drinking water by complexation-coacervation-adsorption with defluorination adsorption material based on aluminium base composite metal oxide |
| CN103224301B (en) * | 2012-12-28 | 2014-05-07 | 中国科学院生态环境研究中心 | Method for removing fluorides in water based on complexation-condensation-adsorption combination |
| CN103274539B (en) * | 2012-12-28 | 2014-06-18 | 中国科学院生态环境研究中心 | Method for removing fluoride in drinking water by complexation-coacervation-adsorption with defluorination adsorption material based on aluminium base composite metal oxide |
| CN110015781A (en) * | 2019-04-30 | 2019-07-16 | 山东双科矿山科技有限公司 | A kind of high-effective defluorination method of coal mine well water |
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