CN101439900A - Method and system for removing bromate in water by oxidation-reduction - Google Patents
Method and system for removing bromate in water by oxidation-reduction Download PDFInfo
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- CN101439900A CN101439900A CNA2008102414152A CN200810241415A CN101439900A CN 101439900 A CN101439900 A CN 101439900A CN A2008102414152 A CNA2008102414152 A CN A2008102414152A CN 200810241415 A CN200810241415 A CN 200810241415A CN 101439900 A CN101439900 A CN 101439900A
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Abstract
The invention relates to a method for removing bromate in water through oxidation reduction and a system thereof. The method comprises the following steps: firstly, controlling the dissolved oxygen concentration in the water at a lower level through the nitrification of ammonia salt and microbes on the active carbon; secondly, removing the bromate in the water through the reducibility of ferrous sulfate; and finally, removing excessive ferric ions in the water through a filtering unit. The system comprises a pretreatment working section for controlling the dissolved oxygen in the water, an oxidation reduction working section for removing the bromate and a filtering treatment working section for removing the excessive ferric ions, wherein the pretreatment working section is connected with the oxidation reduction working section, and the oxidation reduction working section is connected with the filtering treatment working section. The method can effectively remove the bromate in the water with a bromate removal rate of above 60 percent. The system has convenient operation and low running cost, can also be integrated with other technologies, and have very high practicability.
Description
Technical field
Technical solution of the present invention relates to water technology, is specifically related to the method and system that bromate in the water is removed in a kind of redox.
Background technology
Water pollutes the drinking water safety problem serious threat that causes and the healthy of people, and the control by product has become the core missions of water-purifying process when improving water purification usefulness.The ozonize combination process obtains promoting in many developed countries because of its advantage of generally acknowledging, and beginning is adopted in China.But along with the use of ozonize technology, it has also caused negative impact to drinking water safety.The former water of bromine ion-containing will generate the bromate that conventional water treatment process is difficult to remove in the ozonize process.Ozonization water purification technology is when cutting down Micropollutants such as conventional pollutent and agricultural chemicals significantly, and bromate is become influences the healthy potential threat of resident.
Bromate is decided to be the potential carcinogen of 2B level (higher carcinogenic possibility) by international cancer research institution, and animal experiment confirms that it has carinogenicity, and microbiological test finds that it has mutagenicity.American National Bureau for Environmental Protection (EPA) studies show that: the content of bromate is that μ g/L level all can have certain carcinogenesis in the tap water, and the carcinogenic risk rate of taking in the bromate of 3 μ g/L is 10
-5The carcinogenic risk rate of taking in the bromate of 5 μ g/L is 10
-4
The bromate maximum level is 25 μ g/L in The World Health Organization's suggestion control tap water; U.S. EPA in fs tap water control bill in the regulation tap water maximum of bromate allow that mass concentration is 10 μ g/L, and will carry out the transition to more strict standard; Provided the bromate maximum permissible concentration of 10 μ g/L in " the Urban water supply water quality standard " of in February, 2005 issue of China Ministry of Construction; Also be defined in when using ozone in new " drinking water sanitary standard " that on July 1st, 2007, beginning was implemented in China, the maximum constraints of bromate is 10 μ g/L.
Although the bromate growing amount can obtain to a certain degree control by approach such as process optimizations, it is unpractical avoiding fully.About the removal of bromate, carried out many researchs abroad, mainly contain membrane processing method, ion exchange method, biological degradation method, charcoal absorption reduction method and chemical agent reduction method.The laboratory study of removal bromates such as UV radiation, high-power electron beam irradiation also has report.Wherein, membrane processing method is good to the removal effect of bromate, but reduced price is higher, also can produce some waste water that contain the high density bromate simultaneously and need obtain other processing; Biological degradation method also has effect preferably to bromate, but needs the long time; The charcoal absorption rule need regularly replace and expense higher, troublesome poeration.
Summary of the invention
In order to solve in the method that the removal bromate that exists in the prior art adopted, membrane processing method is good to the removal effect of bromate, but reduced price is higher, also can produce some waste water that contain the high density bromate simultaneously and need obtain other processing; Biological degradation method also has effect preferably to bromate, but needs the long time; The charcoal absorption rule need regularly replace and expense higher, these technical problems of troublesome poeration the invention provides the method that bromate in the water is removed in a kind of redox.
The method the present invention who adopts a kind of redox of the present invention to remove bromate in the water also provides a kind of redox to remove the system of bromate in the water.
The present invention solves the technical scheme that the prior art problem adopted: the method that provides a kind of redox to remove bromate in the water, described redox are removed the method for bromate in the water for remove the bromate in the water by the reductibility of ferrous sulfate.
According to an optimal technical scheme of the present invention: the method that bromate in the water is removed in described redox specifically comprises step: the first, by the dissolved oxygen in the nitrification control water of ammonium salt and gac; The second, by the bromate in the reductibility removal water of ferrous sulfate; Three, remove excessive iron ion in the water by filtering unit.
According to an optimal technical scheme of the present invention: the described the first step comprises substep: at first, Xiang Shuizhong is according to 1mgNH
4 +/ 4.57mgO
2(with NH
4 +Meter) ratio adds ammonium salt; Secondly, be 1.5-2.5mg/L by the dissolved oxygen in the biological activated carbon control water.
According to an optimal technical scheme of the present invention: described second step is: the described copperas solution of 10-30mg/L at 15 ℃-25 ℃, is added under the meta-alkalescence condition through in the described the first step treated water, mixes and stir the bromate of removing in the water.
According to an optimal technical scheme of the present invention: described second step is specially: at 20 ℃, pH value is to be added in the water of crossing through described processing of step A under 8 the condition, mixes the bromate in the stirring reaction 15min-20min removal water with described copperas solution.
According to an optimal technical scheme of the present invention: described the 3rd step is specially utilizes the adsorption of holding back of biological activated carbon to remove excessive iron ion in the water, described biological activated carbon is the carbon post, the height of described carbon post is 0.8m-1m, EBCT is controlled at 10min-25min, the mode that back flushing adopts water to dash, wash-down water intensity is 10m
2.s-20L/m
2.s, the time is 5min-15min.
The present invention also provides a kind of redox to remove the system of bromate in the water, the system that bromate in the water is removed in described redox comprises: the redox working zone and the filtration treatment working zone of the pre-treatment working zone of control oxygen in water, removal bromate, wherein, described pre-treatment working zone is connected with described redox working zone, and described redox working zone is connected with described filtration treatment working zone.
According to an optimal technical scheme of the present invention: described pre-treatment working zone comprises: described pre-treatment working zone comprises: feed-water end, the automatic adding set of ammonium salt and first step active carbon filtering device, wherein, the automatic adding set of described ammonium salt is connected with described feed-water end, and described feed-water end is connected with described first step active carbon filtering device with the automatic adding set of described ammonium salt.
According to an optimal technical scheme of the present invention: described redox working zone comprises: automatic adding set of ferrous sulfate and redox working chamber, wherein, described redox working chamber is connected with the automatic adding set of described ferrous sulfate with described first active carbon filtering device respectively.
According to an optimal technical scheme of the present invention: described filtration treatment working zone comprises: second stage active carbon filtering device, recoil feed-water end and water side, wherein, described second stage active carbon filtering device is connected with described recoil feed-water end with the water side of described redox working chamber respectively, and described water side is connected with the water side of described second stage active carbon filtering device.
Technical solution of the present invention can be removed ozone in water by product bromate effectively, can reach more than 60% bromate removal rate, and realize removal to iron ion in the water by follow-up active carbon column.The system features in convenient of bromate in the water is removed in redox of the present invention, and working cost is low, can also combine with other technology simultaneously, has very high practicality.
Description of drawings
Fig. 1. the method flow diagram that bromate in the water is removed in redox in the method and system of bromate in the water is removed in a kind of redox of the present invention;
Fig. 2. the system construction drawing that bromate in the water is removed in redox in the method and system of bromate in the water is removed in a kind of redox of the present invention.
Embodiment
The present invention will be described below in conjunction with drawings and Examples:
Among the figure: pre-treatment working zone 101, redox working zone 102, filtration treatment working zone 103, feed-water end 104, ammonium chloride solution holding tank 105, first volume pump 106, static mixer 107, first step activated carbon column 108, copperas solution holding tank 109, redox working chamber 110, second volume pump 111, stirrer 112, second stage activated carbon column 113, recoil feed-water end 114, the 3rd volume pump 115, first upflow tube 116, second upflow tube 117, water side 118.
See also a kind of redox of Fig. 1 the present invention and remove the method flow diagram that bromate in the water is removed in redox in the method and system of bromate in the water, as shown in Figure 1, the method for bromate specifically comprises step in the described redox removal water: the first, by the dissolved oxygen in the nitrification control water of ammonium salt and gac; The second, by the bromate in the reductibility removal water of ferrous sulfate; Three, remove excessive iron ion in the water by filtering unit.
In the preferred technical solution of the present invention, the described the first step comprises substep: at first, Xiang Shuizhong is according to 1mgNH
4 +/ 4.57mgO
2(with NH
4 +Meter) ratio adds ammonium salt; Secondly, be 1.5-2.5mg/L by the dissolved oxygen in the biological activated carbon control water.The described the first step is specially the nitrification control oxygen in water that utilizes microorganism on ammonium salt and the biological activated carbon, and in nitrifying process, 1mol nitrogen (N) is oxidized to nitrate nitrogen, needs 2mol molecular oxygen (O
2), promptly 1g nitrogen is finished nitration reaction, aerobic 4.57g, and chemical equation is: NH
4 ++ 2O
2→ NO
2 -+ H
2O+2H
+1.
The bromate that second reductibility of step by ferrous sulfate of the present invention removed in the water is: with the described copperas solution of 10-30mg/L at 15 ℃-25 ℃, be added under the meta-alkalescence condition through in the described the first step treated water, mix and stir the bromate of removing in the water.In the preferred technical solution of the present invention: described second step is specially: at 20 ℃, pH value is to be added in the water of crossing through described processing of step A under 8 the condition, mixes the bromate in the stirring reaction 15min-20min removal water with described copperas solution.The dosage of ferrous sulfate can be according to the concrete concentration adjustment of bromate.When the concentration of bromate was lower than 100 μ g/L in the former water, the preferred dosage of ferrous sulfate was 10～30mg/L.Chemical equation in described second step is:
6Fe
2++BrO
3 -+6H
+＝6Fe
3++Br
-+3H
2O；
6Fe
2++BrO
3 -+6H
2O＝6Fe
3++Br
-+6OH
-。
Be specially the excessive iron ion in the adsorption removal water of holding back that utilizes biological activated carbon in the 3rd step described in the preferred technical solution of the present invention, described biological activated carbon is the carbon post, the height of described carbon post is 0.8m-1m, EBCT is controlled at 10min-25min, the mode that back flushing adopts water to dash, wash-down water intensity is 10m
2.s-20L/m
2.s, the time is 5min-15min, iron concentration in the water outlet can be controlled at about 0.3mg/L after filtering by described step 3.
See also a kind of redox of Fig. 2 the present invention and remove the system construction drawing that bromate in the water is removed in redox in the method and system of bromate in the water, as shown in Figure 2, the system that bromate in the water is removed in described redox comprises: the redox working zone 102 and the filtration treatment working zone 103 of the pre-treatment working zone 101 of control oxygen in water, removal bromate, wherein, described pre-treatment working zone 101 is connected with described redox working zone 102, and described redox working zone 102 is connected with described filtration treatment working zone 103.
In the preferred technical solution of the present invention: described pre-treatment working zone 101 comprises: feed-water end 104, the automatic adding set of ammonium salt and first step active carbon filtering device, wherein, the automatic adding set of described ammonium salt is connected with described feed-water end 104, and described feed-water end 104 is connected with described first step active carbon filtering device with the automatic adding set of described ammonium salt.Described redox working zone 102 comprises: automatic adding set of ferrous sulfate and redox working chamber 110, wherein, described redox working chamber 110 is connected with the automatic adding set of described ferrous sulfate with described first step active carbon filtering device respectively.Described filtration treatment working zone 103 comprises: second stage active carbon filtering device, recoil feed-water end 114 and water side 118, wherein, described second stage active carbon filtering device is connected with described recoil feed-water end 114 with the water side 118 of described redox working chamber 110 respectively, and described water side 118 is connected with the water side 118 of described second stage active carbon filtering device.
Adopt ammonium chloride solution at ammonium salt described in the preferred technical solution of the present invention, the automatic adding set of described ammonium salt comprises the ammonium chloride solution holding tank 105 and first volume pump 106, and described first step active carbon filtering device is the activated carbon column that bottom is provided with sand cushion.The automatic adding set of described ferrous sulfate comprises the copperas solution holding tank 109 and second volume pump 111, and described redox working chamber 110 is the inner cavity that stirrer 112 is installed.Described second stage active carbon filtering device is the activated carbon column that bottom is provided with sand cushion, and the height of this carbon post is 0.8m-1m, and described recoil feed-water end 114 comprises water inlet pipe and the 3rd volume pump 115.
Below the system of bromate in the water is removed in redox of the present invention working process be specifically described: feed-water end 104 water inlets, in water, add ammonium chloride solution by ammonium chloride solution holding tank 105, the addition of described ammonium chloride solution is by 106 controls of described first volume pump, and in 107 times mixing of static mixer, be provided with the dissolved oxygen in the first step activated carbon column 108 control water of sand cushion by bottom, after nitration reaction was finished, the content of dissolved oxygen can drop to about 2.0mg/L.
In redox working chamber 110, add copperas solution by copperas solution holding tank 109, the addition of described copperas solution is controlled by described second volume pump 111, and water in the described redox working chamber 110 and described copperas solution mix the back by the bromate in the described stirrer 112 stirring reaction 15min-20min removal water.
The described second stage activated carbon column 113 that is provided with sand cushion by bottom filters removes excessive iron ion in the water, filteringly carries out back flushing by recoil feed-water end 114 simultaneously, and wash-down water intensity is 10m
2.s-20L/m
2.s, the time is 5min-15min, and the process of back flushing is by 115 controls of described the 3rd volume pump.
Be through the healthy water behind the bromate in the redox removal water by above method and through the final outflow water end 118 after the system of bromate in the described redox removal water.
Technical solution of the present invention can be removed ozone in water by product bromate effectively, can reach more than 60% bromate removal rate, and realize removal to iron ion in the water by follow-up active carbon column.The system features in convenient of bromate in the water is removed in redox of the present invention, and working cost is low, can also combine with other technology simultaneously, has very high practicality.
Above content be in conjunction with concrete optimal technical scheme to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the method for bromate in the water is removed in a redox, it is characterized in that: described redox is removed the method for bromate in the water for remove the bromate in the water by the reductibility of ferrous sulfate.
2. according to the method for bromate in the described redox removal of claim 1 water, it is characterized in that: the method that bromate in the water is removed in described redox specifically comprises step:
A: by the dissolved oxygen in the nitrification control water of microorganism on ammonium salt and the gac;
B: by the bromate in the reductibility removal water of ferrous sulfate;
C: remove excessive iron ion in the water by filtering unit.
3. according to the method for bromate in the described redox removal of claim 2 water, it is characterized in that: described steps A comprises substep:
A1: Xiang Shuizhong is according to 1mgNH
4 +/ 4.57mgO
2(with NH
4 +Meter) ratio adds ammonium salt;
A2: by the dissolved oxygen in the nitrification control water is 1.5-2.5mg/L.
4. remove the method for bromate in the water according to the described redox of claim 2, it is characterized in that: described step B is specially: with the described copperas solution of 10-30mg/L at 15 ℃-25 ℃, be added under the meta-alkalescence condition in the water of crossing through described processing of step A, mix and stir the bromate of removing in the water.
5. remove the method for bromate in the water according to claim 2 or 4 described redox, it is characterized in that: described step B is specially: with described copperas solution at 20 ℃, the pH value is to be added under 8 the condition in the water of crossing through described processing of step A, mixes stirring reaction 15min-20min and removes bromate in the water.
6. remove the method for bromate in the water according to the described redox of claim 2, it is characterized in that: described step C is specially and utilizes the adsorption of holding back of biological activated carbon to remove excessive iron ion in the water, described biological activated carbon is the carbon post, the height of described carbon post is 0.8m-1m, EBCT is controlled at 10min-25min, the mode that back flushing adopts water to dash, wash-down water intensity is 10m
2.s-20L/m
2.s, the time is 5min-15min.
7. the system of bromate in the water is removed in a redox, it is characterized in that: the system that bromate in the water is removed in described redox comprises: the redox working zone and the filtration treatment working zone of the pre-treatment working zone of control oxygen in water, removal bromate, wherein, described pre-treatment working zone is connected with described redox working zone, and described redox working zone is connected with described filtration treatment working zone.
8. remove the system of bromate in the water according to the described redox of claim 7, it is characterized in that: described pre-treatment working zone comprises: feed-water end, the automatic adding set of ammonium salt and first step active carbon filtering device, wherein, the automatic adding set of described ammonium salt is connected with described feed-water end, and described feed-water end is connected with described first step active carbon filtering device with the automatic adding set of described ammonium salt.
9. remove the system of bromate in the water according to the described redox of claim 7, it is characterized in that: described redox working zone comprises: automatic adding set of ferrous sulfate and redox working chamber, wherein, described redox working chamber is connected with the automatic adding set of described ferrous sulfate with described first active carbon filtering device respectively.
10. remove the system of bromate in the water according to the described redox of claim 7, it is characterized in that: described filtration treatment working zone comprises: second stage active carbon filtering device, recoil feed-water end and water side, wherein, described second stage active carbon filtering device is connected with described recoil feed-water end with the water side of described redox working chamber respectively, and described water side is connected with the water side of described second stage active carbon filtering device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102414152A CN101439900A (en) | 2008-12-19 | 2008-12-19 | Method and system for removing bromate in water by oxidation-reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102414152A CN101439900A (en) | 2008-12-19 | 2008-12-19 | Method and system for removing bromate in water by oxidation-reduction |
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|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967020A (en) * | 2010-09-13 | 2011-02-09 | 清华大学 | Device and method for controlling bromate in ozone treatment of drinking water |
| CN101708884B (en) * | 2009-11-06 | 2011-12-21 | 哈尔滨工业大学深圳研究生院 | Method for removing bromate in water by silver coated activated carbon |
| CN107902815A (en) * | 2017-10-31 | 2018-04-13 | 中铁第四勘察设计院集团有限公司 | A kind of method that homogeneous photochemical catalysis removes bromate in water removal |
| CN113171739A (en) * | 2021-04-25 | 2021-07-27 | 中南民族大学 | Method for generating superoxide anion free radical by catalytically activating bromate and application of superoxide anion free radical generated by method |
-
2008
- 2008-12-19 CN CNA2008102414152A patent/CN101439900A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708884B (en) * | 2009-11-06 | 2011-12-21 | 哈尔滨工业大学深圳研究生院 | Method for removing bromate in water by silver coated activated carbon |
| CN101967020A (en) * | 2010-09-13 | 2011-02-09 | 清华大学 | Device and method for controlling bromate in ozone treatment of drinking water |
| CN101967020B (en) * | 2010-09-13 | 2012-10-24 | 清华大学 | Device and method for controlling bromate in ozone treatment of drinking water |
| CN107902815A (en) * | 2017-10-31 | 2018-04-13 | 中铁第四勘察设计院集团有限公司 | A kind of method that homogeneous photochemical catalysis removes bromate in water removal |
| CN113171739A (en) * | 2021-04-25 | 2021-07-27 | 中南民族大学 | Method for generating superoxide anion free radical by catalytically activating bromate and application of superoxide anion free radical generated by method |
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Open date: 20090527 |