CN104355452A - Continuous multistage ion-exchange treatment device for recovering heavy metal ions - Google Patents
Continuous multistage ion-exchange treatment device for recovering heavy metal ions Download PDFInfo
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- CN104355452A CN104355452A CN201410649325.2A CN201410649325A CN104355452A CN 104355452 A CN104355452 A CN 104355452A CN 201410649325 A CN201410649325 A CN 201410649325A CN 104355452 A CN104355452 A CN 104355452A
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- exchange column
- chromium ion
- quartz sand
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- 238000005342 ion exchange Methods 0.000 title claims abstract description 108
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 24
- 150000002500 ions Chemical class 0.000 title claims abstract description 15
- 229910001430 chromium ion Inorganic materials 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000006004 Quartz sand Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- BQPIGGFYSBELGY-UHFFFAOYSA-N mercury(2+) Chemical group [Hg+2] BQPIGGFYSBELGY-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000002351 wastewater Substances 0.000 claims abstract description 26
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 230000008929 regeneration Effects 0.000 claims abstract description 18
- 238000011069 regeneration method Methods 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 238000004062 sedimentation Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000010979 pH adjustment Methods 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 11
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 9
- 238000001556 precipitation Methods 0.000 claims abstract description 8
- FOIXSVOLVBLSDH-UHFFFAOYSA-N Silver ion Chemical compound [Ag+] FOIXSVOLVBLSDH-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003480 eluent Substances 0.000 claims abstract description 6
- 239000006228 supernatant Substances 0.000 claims abstract description 5
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 239000011651 chromium Substances 0.000 description 9
- 229910052753 mercury Inorganic materials 0.000 description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- -1 silver ions Chemical class 0.000 description 3
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Treatment Of Water By Ion Exchange (AREA)
Abstract
本发明公开了一种用于回收重金属离子的连续多级离子交换处理装置，它包括废水处理装置和树脂再生装置两个部分，其中废水处理装置包括用于存储废水的原水桶，原水桶通过连接有第一泵的第一管线与用于银离子沉淀回收的反应沉淀池相连通，开在反应沉淀池上部的上清液出口通过第二管线与pH调节桶进水口相连通，pH调节桶与石英砂柱、三价铬离子交换柱、六价铬离子交换柱以及汞离子交换柱依次串联连接；树脂再生装置包括通过装有第六泵的酸再生管与三价铬离子交换柱和汞离子交换柱柱顶酸液进口相连通的酸脱液桶、通过装有第五泵的碱再生管与六价铬离子交换柱柱顶碱液进口相连通的碱洗脱液桶。采用本方法可连续运行，提高了设备的处理效率。
The invention discloses a continuous multi-stage ion exchange treatment device for recovering heavy metal ions, which includes two parts: a waste water treatment device and a resin regeneration device, wherein the waste water treatment device includes a raw water bucket for storing waste water, the raw water bucket is connected through The first pipeline with the first pump is connected with the reaction sedimentation tank used for silver ion precipitation recovery, and the supernatant liquid outlet opened on the upper part of the reaction sedimentation tank is connected with the water inlet of the pH adjustment tank through the second pipeline, and the pH adjustment tank is connected with the water inlet of the pH adjustment tank. The quartz sand column, the trivalent chromium ion exchange column, the hexavalent chromium ion exchange column and the mercury ion exchange column are connected in series in sequence; The acid dehydration barrel connected to the acid liquid inlet on the top of the exchange column, and the alkali eluent barrel connected to the alkali liquid inlet on the top of the hexavalent chromium ion exchange column through the alkali regeneration pipe equipped with the fifth pump. The method can be used for continuous operation, and the processing efficiency of the equipment is improved.
Description
技术领域technical field
本发明涉及一种连续多级离子交换处理装置，尤其涉及一种用于回收重金属离子的连续多级离子交换处理装置。The invention relates to a continuous multi-stage ion exchange treatment device, in particular to a continuous multi-stage ion exchange treatment device for recovering heavy metal ions.
背景技术Background technique
水体重金属污染已经成为最严重的环境问题之一，有毒重金属对环境的严重威胁正逐步成为全球性的问题。实验室废水中存在如汞、铅、砷、铬、银等种类繁多的有毒重金属，而环境类实验室产生的废水量大，且下水道入口处废水中重金属总Cr、总Ag以及总Hg的浓度皆超过标准的规定，调查发现这些重金属主要来自化学需氧量(COD)测试试验产生的残液。废水中重金属含量极高，废水酸性较强。此外，COD测试试验是环境类实验室中主要的试验，每天产生的残液量可达0.5-1L。这部分废水如果不经处理直接排入污水管道会造成严重的危害，如：污水管网的腐蚀；不能自然降解的重金属进入污水处理厂，可能造成微生物的中毒甚至死亡，严重影响出水效果；通过饮用水、植物的蓄积作用进入人体，引起各种病症等。此外，废水中的Ag+、Hg2+和六价铬等离子具有回收的价值，直接排放会造成资源浪费。Water heavy metal pollution has become one of the most serious environmental problems, and the serious threat of toxic heavy metals to the environment is gradually becoming a global problem. There are a wide variety of toxic heavy metals such as mercury, lead, arsenic, chromium, silver, etc. in laboratory wastewater, while environmental laboratories produce a large amount of wastewater, and the concentration of heavy metals total Cr, total Ag and total Hg in wastewater at the sewer entrance All exceeded the standard requirements, and the investigation found that these heavy metals mainly came from the residual liquid produced by the chemical oxygen demand (COD) test. The heavy metal content in the wastewater is extremely high, and the wastewater is highly acidic. In addition, the COD test is the main test in the environmental laboratory, and the amount of residual liquid produced every day can reach 0.5-1L. If this part of wastewater is directly discharged into the sewage pipe without treatment, it will cause serious harm, such as: corrosion of the sewage pipe network; heavy metals that cannot be naturally degraded enter the sewage treatment plant, which may cause microbial poisoning or even death, seriously affecting the water output effect; through The accumulation of drinking water and plants enters the human body, causing various diseases and so on. In addition, Ag+, Hg2+, and hexavalent chromium ions in wastewater have the value of recovery, and direct discharge will cause waste of resources.
近年来，已经有许多利用离子交换法处理含铬、汞废水的案例，离子交换法是利用离子交换树脂中含有的活性基团与废水中的重金属离子进行交换、螯合。这种方法不仅能够去除废水中的重金属离子，同时还可以将重金属离子进行浓缩和回收。离子交换法是目前处理含铬废水较好的方法，具有交换吸附容量大，回收效果好，对环境无二次污染，应用较广泛，技术较成熟等优点。目前已有多种去除废水中铬或汞的离子交换设备，但此类离子交换设备普遍只针对单一重金属离子，而且连续运行能力差。In recent years, there have been many cases of using ion exchange method to treat wastewater containing chromium and mercury. Ion exchange method uses active groups contained in ion exchange resin to exchange and chelate heavy metal ions in wastewater. This method can not only remove heavy metal ions in wastewater, but also concentrate and recover heavy metal ions. The ion exchange method is currently a better method for treating chromium-containing wastewater. It has the advantages of large exchange adsorption capacity, good recovery effect, no secondary pollution to the environment, wide application, and mature technology. At present, there are many kinds of ion exchange equipment for removing chromium or mercury in wastewater, but these ion exchange equipment generally only target a single heavy metal ion, and their continuous operation ability is poor.
发明内容Contents of the invention
本发明的目的在于克服已有技术的缺点，提供一种能够去除多种重金属组分同时能够连续运行的用于回收重金属离子的连续多级离子交换处理装置。The purpose of the present invention is to overcome the shortcomings of the prior art, and provide a continuous multi-stage ion exchange treatment device for recovering heavy metal ions that can remove various heavy metal components and can operate continuously.
为了达到上述目的，本发明采用的技术方案是：In order to achieve the above object, the technical scheme adopted in the present invention is:
本发明的一种用于回收重金属离子的连续多级离子交换处理装置，它包括废水处理装置和树脂再生装置两个部分，其中废水处理装置包括用于存储废水的原水桶，原水桶通过连接有第一泵的第一管线与用于银离子沉淀回收的反应沉淀池相连通，所述的反应沉淀池池底通过装有阀的出水管线与氯化银回收罐相连，所述的反应沉淀池通过装有第二泵的沉淀剂输送管线与沉淀剂池相连通，开在所述的反应沉淀池上部的上清液出口通过第二管线与pH调节桶进水口相连通，所述的pH调节桶与石英砂柱、三价铬离子交换柱、六价铬离子交换柱以及汞离子交换柱依次串联连接，其中pH调节桶的出水口通过连接第三泵和第一压力表的第三管线与石英砂柱顶部进水口相连，所述的第一石英砂柱的柱底出水口通过装有第二压力表的第四管线与三价铬离子交换柱的柱底进水口相连通，所述的三价铬离子交换柱的柱顶出水口通过装有第三压力表的第五管线与六价铬离子交换柱柱顶进水口相连通，六价铬离子交换柱柱底出水口通过装有第四压力表的第六管线与汞离子交换柱柱底进水口相连通，汞离子交换柱柱顶出水口通过出水管与出水桶相连通，石英砂柱柱顶接放气管并且柱底接放空管，在石英砂柱、三价铬离子交换柱、六价铬离子交换柱以及汞离子交换柱柱侧接有反冲洗出水管；所述的树脂再生装置包括通过装有第六泵的酸再生管与三价铬离子交换柱和汞离子交换柱柱顶酸液进口相连通的酸脱液桶、通过装有第五泵的碱再生管与六价铬离子交换柱柱顶碱液进口相连通的碱洗脱液桶，通过反冲洗管分别与第一石英砂柱、三价铬离子交换柱、六价铬离子交换柱以及汞离子交换柱的各柱底的反冲洗口相连通的反冲洗桶以及分别通过装有流量计的回收管线与三价铬离子交换柱、六价铬离子交换柱和汞离子交换柱各柱底的再生液回收口相连通的再生液回收桶。A continuous multi-stage ion exchange treatment device for recovering heavy metal ions of the present invention includes two parts: a waste water treatment device and a resin regeneration device, wherein the waste water treatment device includes a raw water bucket for storing waste water, and the raw water bucket is connected to a The first pipeline of the first pump is connected with the reaction sedimentation tank used for silver ion precipitation recovery, and the bottom of the reaction sedimentation tank is connected with the silver chloride recovery tank through the outlet pipeline equipped with a valve, and the reaction sedimentation tank is The precipitant delivery pipeline equipped with the second pump is connected with the precipitant tank, and the supernatant outlet on the upper part of the reaction sedimentation tank is connected with the pH adjustment bucket water inlet through the second pipeline, and the pH adjustment The barrel is connected in series with the quartz sand column, the trivalent chromium ion exchange column, the hexavalent chromium ion exchange column and the mercury ion exchange column, wherein the outlet of the pH adjustment barrel is connected to the third pipeline connected to the third pump and the first pressure gauge. The water inlet at the top of the quartz sand column is connected, and the water outlet at the bottom of the column of the first quartz sand column is connected with the water inlet at the bottom of the column of the trivalent chromium ion exchange column through the fourth pipeline equipped with a second pressure gauge. The column top water outlet of the trivalent chromium ion exchange column is connected with the column top water inlet of the hexavalent chromium ion exchange column through the fifth pipeline equipped with the third pressure gauge, and the column bottom water outlet of the hexavalent chromium ion exchange column is connected through the fifth pipeline equipped with the third pressure gauge. The sixth pipeline of the four pressure gauges is connected to the water inlet at the bottom of the mercury ion exchange column, the water outlet at the top of the mercury ion exchange column is connected to the outlet barrel through the outlet pipe, the top of the quartz sand column is connected to the vent pipe and the bottom of the column is connected to the vent tube, the backwash outlet pipe is connected to the side of the quartz sand column, the trivalent chromium ion exchange column, the hexavalent chromium ion exchange column and the mercury ion exchange column; the resin regeneration device includes acid regeneration equipped with the sixth pump The acid dehydration barrel connected with the acid solution inlet of the trivalent chromium ion exchange column and the column top of the mercury ion exchange column is connected with the alkali solution inlet of the column top of the hexavalent chromium ion exchange column through the alkali regeneration tube equipped with the fifth pump Alkaline eluent bucket, through the backwash tube respectively connected with the first quartz sand column, trivalent chromium ion exchange column, hexavalent chromium ion exchange column and the backwash port at the bottom of each column of mercury ion exchange column. The barrel and the regenerating liquid recovery barrel respectively communicated with the regenerating liquid recovery port at the bottom of each column of the trivalent chromium ion exchange column, hexavalent chromium ion exchange column and mercury ion exchange column through the recovery pipeline equipped with a flow meter.
本发明的优点在于：(1)本发明设备为多级离子交换设备，可同时对高浓度重金属废水进行银离子、三价铬离子、六价铬离子、汞离子的去除和收集，增强了设备实用性；(2)本发明设备包含了废水处理与树脂再生，可连续运行，提高了设备的处理效率；(3)本发明设备在高浓度重金属废水处理中，处理成本低，工艺流程简单，易于控制，具有较好的实际应用前景。The advantages of the present invention are: (1) The equipment of the present invention is a multi-stage ion exchange equipment, which can simultaneously remove and collect silver ions, trivalent chromium ions, hexavalent chromium ions, and mercury ions from high-concentration heavy metal wastewater, which enhances the efficiency of the equipment. Practicality; (2) The equipment of the present invention includes waste water treatment and resin regeneration, and can run continuously, which improves the treatment efficiency of the equipment; (3) The equipment of the present invention has low treatment cost and simple process flow in the treatment of high-concentration heavy metal wastewater. It is easy to control and has good practical application prospects.
附图说明Description of drawings
图1是本发明的一种用于回收重金属离子的连续多级离子交换处理装置的结构示意图；Fig. 1 is a kind of structural representation of the continuous multi-stage ion exchange treatment device for reclaiming heavy metal ions of the present invention;
图2是图1中的处理装置中的离子交换柱的结构示意图。Fig. 2 is a schematic structural view of an ion exchange column in the processing device in Fig. 1 .
具体实施方式Detailed ways
下面结合具体实施例对本发明进行详细描述。The present invention will be described in detail below in conjunction with specific embodiments.
如附图所示的本发明的一种用于回收重金属离子的连续多级离子交换处理装置，它包括废水处理装置和树脂再生装置两个部分，其中废水处理装置包括用于存储废水的原水桶1，原水桶1通过连接有第一泵P1的第一管线与用于银离子沉淀回收的反应沉淀池2相连通，所述的反应沉淀池2池底通过装有阀的出水管线与氯化银回收罐13相连，所述的反应沉淀池2通过装有第二泵P2的沉淀剂输送管线与沉淀剂池14相连通，开在所述的反应沉淀池2上部的上清液出口通过第二管线与pH调节桶3进水口相连通，所述的pH调节桶3与石英砂柱4、三价铬离子交换柱5、六价铬离子交换柱6以及汞离子交换柱7依次串联连接，其中pH调节桶3的出水口通过连接第三泵P3和第一压力表的第三管线与石英砂柱4顶部进水口相连，所述的第一石英砂柱4的柱底出水口通过装有第二压力表的第四管线与三价铬离子交换柱5的柱底进水口相连通，所述的三价铬离子交换柱5的柱顶出水口通过装有第三压力表的第五管线与六价铬离子交换柱6柱顶进水口相连通，六价铬离子交换柱6柱底出水口通过装有第四压力表的第六管线与汞离子交换柱7柱底进水口相连通，汞离子交换柱7柱顶出水口通过出水管与出水桶8相连通，石英砂柱4柱顶接放气管并且柱底接放空管，在石英砂柱4、三价铬离子交换柱5、六价铬离子交换柱6以及汞离子交换柱7柱侧接有反冲洗出水管；所述的树脂再生装置包括通过装有第六泵P6的酸再生管与三价铬离子交换柱5和汞离子交换柱7柱顶酸液进口相连通的酸脱液桶10、通过装有第五泵P5的碱再生管与六价铬离子交换柱6柱顶碱液进口相连通的碱洗脱液桶9，通过反冲洗管分别与第一石英砂柱4、三价铬离子交换柱5、六价铬离子交换柱6以及汞离子交换柱7的各柱底的反冲洗口相连通的反冲洗桶11以及分别通过装有流量计的回收管线与三价铬离子交换柱5、六价铬离子交换柱6和汞离子交换柱7各柱底的再生液回收口相连通的再生液回收桶12。As shown in the accompanying drawings, a continuous multi-stage ion exchange treatment device for recovering heavy metal ions of the present invention includes two parts: a waste water treatment device and a resin regeneration device, wherein the waste water treatment device includes a raw water tank for storing waste water 1. The raw water tank 1 communicates with the reaction sedimentation tank 2 for silver ion precipitation and recovery through the first pipeline connected with the first pump P1, and the bottom of the reaction sedimentation tank 2 is connected to the chlorination tank through the outlet pipeline equipped with a valve. Silver recovery tank 13 links to each other, and described reaction sedimentation tank 2 is communicated with sedimentation agent tank 14 through the precipitant delivery pipeline that the second pump P2 is housed, and the supernatant liquid outlet that opens in described reaction sedimentation tank 2 top passes through the first The second pipeline is connected with the water inlet of the pH adjustment tank 3, and the pH adjustment tank 3 is connected in series with the quartz sand column 4, the trivalent chromium ion exchange column 5, the hexavalent chromium ion exchange column 6 and the mercury ion exchange column 7, Wherein the water outlet of the pH adjustment barrel 3 is connected to the water inlet at the top of the quartz sand column 4 through the third pipeline connecting the third pump P3 and the first pressure gauge, and the water outlet at the bottom of the first quartz sand column 4 is connected by a The fourth pipeline of the second pressure gauge communicates with the water inlet at the bottom of the column 5 of the trivalent chromium ion exchange column, and the water outlet at the top of the column 5 of the trivalent chromium ion exchange column passes through the fifth pipeline equipped with the third pressure gauge It is connected with the water inlet at the top of the 6th column of the hexavalent chromium ion exchange column, and the water outlet at the bottom of the 6th column of the hexavalent chromium ion exchange column is connected with the water inlet at the bottom of the 7th column of the mercury ion exchange column through the sixth pipeline equipped with the fourth pressure gauge. The water outlet on the top of the mercury ion exchange column 7 is connected to the water outlet barrel 8 through the water outlet pipe, the top of the quartz sand column 4 is connected to the vent pipe and the bottom of the column is connected to the vent pipe, and the quartz sand column 4, the trivalent chromium ion exchange column 5, The side of hexavalent chromium ion exchange column 6 and mercury ion exchange column 7 is connected with a backwash outlet pipe; the resin regeneration device includes an acid regeneration tube equipped with a sixth pump P6 and trivalent chromium ion exchange column 5 and mercury The acid dehydration barrel 10 connected to the acid liquid inlet on the top of the ion exchange column 7, the alkali eluent barrel connected to the alkali liquid inlet on the top of the hexavalent chromium ion exchange column 6 through the alkali regeneration pipe equipped with the fifth pump P5 9. The backwash barrel connected to the backwash port at the bottom of each column of the first quartz sand column 4, trivalent chromium ion exchange column 5, hexavalent chromium ion exchange column 6 and mercury ion exchange column 7 through the backwash pipe 11 and the regenerating liquid recovery bucket 12 which is respectively connected to the regenerating liquid recovery port at the bottom of each column of the trivalent chromium ion exchange column 5, the hexavalent chromium ion exchange column 6 and the mercury ion exchange column 7 through the recovery pipeline equipped with a flowmeter.
石英砂柱4起到过滤作用去除废水中的悬浮物，之后以下进上出方式通过三价铬离子交换柱去除三价铬离子，再以上进下出方式通过六价铬离子交换柱去除六价铬离子，最后以下进上出方式通过汞离子交换柱去除汞离子，最后进入出水桶8。The quartz sand column 4 acts as a filter to remove suspended solids in the wastewater, and then removes trivalent chromium ions through the trivalent chromium ion exchange column in the down-in and up-out manner, and then removes the hexavalent chromium ion in the up-in and down out mode through the hexavalent chromium ion exchange column. The chromium ions are finally removed from the mercury ion exchange column by the way of going in and out from the bottom, and finally enter the outlet bucket 8.
如图2所示石英砂柱4与三价铬离子交换柱5、六价铬离子交换柱6以及汞离子交换柱7构造相同，均包括有机玻璃或玻璃钢材质壳体，在所述的壳体内上下分别设有布水器B，在所述的石英砂柱4壳体内填装有石英砂，在所述的三价铬离子交换柱5、六价铬离子交换柱6以及汞离子交换柱7内分别装填有树脂S，石英砂柱与三个离子交换柱之间顺序是经过综合考虑树脂对不同离子的选择性、树脂交换容量的充分利用、不同树脂型态出水、pH变化等因素而确定的。三价铬离子交换柱5内树脂可以采用D072(天津南开和成科技有限公司)，六价铬离子交换柱6内树脂以采用DEX-Hg(郑州勤实科技有限公司)，汞离子交换柱7内树脂可以采用DEX-Cr(郑州勤实科技有限公司)。As shown in Figure 2, the quartz sand column 4 has the same structure as the trivalent chromium ion exchange column 5, the hexavalent chromium ion exchange column 6 and the mercury ion exchange column 7, and both include organic glass or fiberglass material shells, in the shells Water distributors B are respectively arranged up and down, and quartz sand is filled in the shell of the quartz sand column 4, and the trivalent chromium ion exchange column 5, the hexavalent chromium ion exchange column 6 and the mercury ion exchange column 7 Resin S is filled inside, and the sequence between the quartz sand column and the three ion exchange columns is determined by comprehensively considering the selectivity of the resin to different ions, the full utilization of the resin exchange capacity, the effluent of different resin types, and the pH change. of. The resin in the trivalent chromium ion exchange column 5 can be D072 (Tianjin Nankai Hecheng Technology Co., Ltd.), the resin in the hexavalent chromium ion exchange column 6 can be DEX-Hg (Zhengzhou Qinshi Technology Co., Ltd.), and the mercury ion exchange column 7 The inner resin can use DEX-Cr (Zhengzhou Qinshi Technology Co., Ltd.).
本装置的工作过程为：废水首先加入原水桶1，通过第一泵P1打入反应沉淀池2进行银离子沉淀回收，上清液通过右侧管道进入pH调节池3进行pH调节，之后由第三泵P3以3BV/h的流速将废水打入石英砂柱上端，以喷淋的方式通过石英砂柱4，起到过滤作用，之后以下进上出方式通过三价铬离子交换柱5去除三价铬离子，再以上进下出方式通过六价铬离子交换柱6去除六价铬离子，然后以下进上出方式通过汞离子交换柱7去除汞离子，最后进入出水桶8。当处理水样达到140BV左右时树脂基本饱和，此时关闭进水，开启反冲洗系统进行反冲洗，之后酸洗脱液以2BV/h流速分别进入三价铬离子交换柱和汞离子交换柱进行洗脱，碱洗脱液以3BV/h流速进入六价铬离子交换柱进行洗脱，分别回收再生液。The working process of this device is as follows: the waste water is firstly added to the raw water tank 1, and then pumped into the reaction sedimentation tank 2 through the first pump P1 for silver ion precipitation and recovery, and the supernatant enters the pH adjustment tank 3 through the right pipeline for pH adjustment, and then the second pump P1 The three-pump P3 pumps wastewater into the upper end of the quartz sand column at a flow rate of 3BV/h, passes through the quartz sand column 4 in a spraying manner, and plays a filtering role, and then passes through the trivalent chromium ion exchange column 5 to remove trivalent chromium. Chromium ions are removed through the hexavalent chromium ion exchange column 6 in the upper-in and lower-out mode, and then the mercury ions are removed through the mercury ion-exchange column 7 in the lower-in and upper-out mode, and finally enter the outlet bucket 8. When the treated water sample reaches about 140BV, the resin is basically saturated. At this time, the water inlet is turned off, and the backwashing system is turned on for backwashing. After that, the acid eluent enters the trivalent chromium ion exchange column and the mercury ion exchange column at a flow rate of 2BV/h respectively. For elution, the alkali eluent enters the hexavalent chromium ion exchange column at a flow rate of 3BV/h for elution, and the regeneration solution is recovered separately.
采用本装置针对实验室COD废水进行的处理，处理效果如下：Using this device to treat laboratory COD wastewater, the treatment effect is as follows:
表1.处理前后水质参数Table 1. Water quality parameters before and after treatment
从表中可以看出，对废水中的Ag+采用AgCl沉淀法进行处理，在初始浓度为3550mg/L，沉淀剂投加量为4g NaCl/L废水、沉淀90min的条件下，去除率可达99％以上。分别采用强酸性阳离子交换树脂D072和DEX-Hg对废水中的Cr3+和Hg2+进行吸附去除，去除率可达90％和97％，树脂DEX-Cr对废水中六价铬的吸附去除率可达99.3％。可见本装置对多种重金属离子都有很好的去除效果。It can be seen from the table that Ag + in wastewater is treated by AgCl precipitation method. Under the conditions of initial concentration of 3550mg/L, precipitation agent dosage of 4g NaCl/L wastewater, and precipitation for 90min, the removal rate can reach More than 99%. The strong acidic cation exchange resin D072 and DEX-Hg are used to adsorb and remove Cr 3+ and Hg 2+ in wastewater respectively, and the removal rate can reach 90% and 97%. The adsorption and removal of hexavalent chromium in wastewater by resin DEX-Cr The rate can reach 99.3%. It can be seen that the device has a good removal effect on various heavy metal ions.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106391147A (en) * | 2016-03-23 | 2017-02-15 | 江苏核电有限公司 | Resin regeneration and post-flushing method of steam generator drainage sewage purification system in nuclear power station |
| CN107089703A (en) * | 2017-05-19 | 2017-08-25 | 深圳市深投环保科技有限公司 | Hierarchy type Waste Water Treatment |
| CN107698067A (en) * | 2017-11-15 | 2018-02-16 | 维科诚（苏州）光伏科技有限公司 | A kind of silver-colored liquid waste treating apparatus of the black silicon of wet method |
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| Title |
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| 李艳: "实验室高浓度特殊重金属废水多级离子交换处理技术研究", 《万方数据》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106391147A (en) * | 2016-03-23 | 2017-02-15 | 江苏核电有限公司 | Resin regeneration and post-flushing method of steam generator drainage sewage purification system in nuclear power station |
| CN107089703A (en) * | 2017-05-19 | 2017-08-25 | 深圳市深投环保科技有限公司 | Hierarchy type Waste Water Treatment |
| CN107698067A (en) * | 2017-11-15 | 2018-02-16 | 维科诚（苏州）光伏科技有限公司 | A kind of silver-colored liquid waste treating apparatus of the black silicon of wet method |
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