CN114988628A - A method for removing chloride ions in wet desulfurization wastewater from thermal power plants - Google Patents
A method for removing chloride ions in wet desulfurization wastewater from thermal power plants Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 74
- 230000023556 desulfurization Effects 0.000 title claims abstract description 72
- 239000002351 wastewater Substances 0.000 title claims abstract description 60
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000000909 electrodialysis Methods 0.000 claims abstract description 38
- 150000001450 anions Chemical class 0.000 claims abstract description 18
- 238000002425 crystallisation Methods 0.000 claims abstract description 15
- 230000008025 crystallization Effects 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000004064 recycling Methods 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 238000004062 sedimentation Methods 0.000 claims abstract description 4
- 238000005189 flocculation Methods 0.000 claims abstract description 3
- 230000016615 flocculation Effects 0.000 claims abstract description 3
- 150000003839 salts Chemical class 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 27
- 238000010612 desalination reaction Methods 0.000 claims description 24
- 239000012528 membrane Substances 0.000 claims description 23
- 239000003011 anion exchange membrane Substances 0.000 claims description 10
- 229910052602 gypsum Inorganic materials 0.000 claims description 10
- 239000010440 gypsum Substances 0.000 claims description 10
- 238000005341 cation exchange Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 125000000542 sulfonic acid group Chemical group 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 abstract description 2
- 150000003841 chloride salts Chemical class 0.000 abstract 1
- 239000012141 concentrate Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 6
- 238000011033 desalting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
本发明公开了一种火电厂湿法脱硫废水中氯离子脱除的方法，是结合精密过滤或絮凝沉降预处理、阴离子选择性电渗析和蒸发结晶将脱硫浆液中的氯盐选择性脱除，并蒸发浓缩得到固体盐。本发明利用预处理+阴离子选择性电渗析+蒸发结晶工艺，选择性去除火电厂湿法脱硫废水中的氯离子，实现了脱硫废水的循环利用，节约水资源，达到了资源化综合利用的目的，工艺简单、能耗低，适于工业化推广应用。
The invention discloses a method for removing chloride ions from thermal power plant wet desulfurization wastewater, which is to selectively remove chloride salts in desulfurization slurry by combining precise filtration or flocculation sedimentation pretreatment, anion selective electrodialysis and evaporative crystallization. And evaporate and concentrate to obtain solid salt. The invention utilizes the pretreatment + anion selective electrodialysis + evaporative crystallization process to selectively remove chloride ions in the wet desulfurization wastewater of thermal power plants, realizes the recycling of desulfurization wastewater, saves water resources, and achieves the purpose of comprehensive utilization of resources , the process is simple, the energy consumption is low, and it is suitable for industrialization and application.
Description
技术领域technical field
本发明属于化工废水处理领域，具体涉及一种火电厂湿法脱硫废水中氯离子脱除的方法。The invention belongs to the field of chemical wastewater treatment, and in particular relates to a method for removing chloride ions in wet desulfurization wastewater from thermal power plants.
背景技术Background technique
火电厂脱硫系统多采用石灰石-石膏湿法脱硫系统，对应每台锅炉配一套石灰石-石膏湿法脱硫系统。石灰石-石膏湿法脱硫系统中，脱硫浆液中氯离子含量对整个系统的安全稳定运行至关重要，关系着设备使用寿命、脱硫效率能否达标、腐蚀等情况，最终影响石膏品质。为了能够保证脱硫系统维持在安全稳定的状态并使脱硫效率达到较高水平，该工艺需要定量排出一部分废水，即为脱硫废水，用以排出系统中累积的氯离子。The desulfurization system of thermal power plants mostly adopts limestone-gypsum wet desulfurization system, and each boiler is equipped with a limestone-gypsum wet desulfurization system. In the limestone-gypsum wet desulfurization system, the chloride ion content in the desulfurization slurry is very important to the safe and stable operation of the whole system, which is related to the service life of the equipment, whether the desulfurization efficiency can reach the standard, corrosion, etc., and ultimately affects the quality of gypsum. In order to ensure that the desulfurization system is maintained in a safe and stable state and the desulfurization efficiency reaches a high level, the process needs to quantitatively discharge a part of the waste water, that is, the desulfurization waste water, to discharge the accumulated chloride ions in the system.
脱硫废水中的Cl-浓度一般为8000～20000mg/L，脱硫废水一般处理难度较大，由于其水质成分复杂，虽然脱硫废水排放量较小，但是也需要经过严格处理之后才能排放，否则将会对周边环境造成污染。目前，脱硫废水中氯离子的常规处理方式主要有化学沉淀法、将脱硫废水排至除灰系统、蒸发浓缩法以及膜分离技术。The Cl - concentration in desulfurization wastewater is generally 8000-20000mg/L, and desulfurization wastewater is generally difficult to treat. Due to its complex water quality, although the amount of desulfurization wastewater discharged is small, it needs to be strictly treated before it can be discharged, otherwise it will be discharged. pollute the surrounding environment. At present, the conventional treatment methods of chloride ions in desulfurization wastewater mainly include chemical precipitation method, discharge of desulfurization wastewater to ash removal system, evaporation concentration method and membrane separation technology.
专利CN202111051464.1公开了一种脱硫废水中氯离子的去除方法，向脱硫废水中添加铝酸钙进行预处理，将预处理后的一次沉淀去除后，添加氢氧化钙和铝粉，并调节pH至碱性，再进行超声处理，然后加热处理产生二次沉淀，将二次沉淀去除。沉淀法需加入大量的化学药剂，处理费用高，产生大量的污泥，且对于低浓度的氯离子除去效果差。Patent CN202111051464.1 discloses a method for removing chloride ions from desulfurization wastewater. Calcium aluminate is added to the desulfurization wastewater for pretreatment, and after the primary precipitation is removed, calcium hydroxide and aluminum powder are added to adjust the pH. To alkaline, then ultrasonic treatment, and then heat treatment to produce secondary precipitation, the secondary precipitation is removed. The precipitation method needs to add a large amount of chemical agents, the treatment cost is high, a large amount of sludge is generated, and the removal effect of low-concentration chloride ions is poor.
离子交换法较常使用，但脱硫废水中硫酸根离子浓度极高，其交换顺序在氯离子之前，影响氯离子交换效果，离子交换树脂需频繁再生，消耗药剂且重新产生废水。The ion exchange method is commonly used, but the sulfate ion concentration in the desulfurization wastewater is extremely high, and its exchange sequence is before the chloride ion, which affects the chloride ion exchange effect.
因此，采用合适的处理方法选择性去除氯离子使得脱硫废水能够循环回用，从而增加石灰石-石膏湿法脱硫系统设备整体的稳定性，难度较大。Therefore, it is more difficult to selectively remove chloride ions by an appropriate treatment method so that the desulfurization wastewater can be recycled, thereby increasing the overall stability of the limestone-gypsum wet desulfurization system equipment.
发明内容SUMMARY OF THE INVENTION
基于上述现有技术所存在的问题，本发明旨在提供一种火电厂湿法脱硫废水中氯离子脱除的方法，以解决目前石灰石-石膏湿法脱硫系统中脱硫废水的循环利用问题。Based on the problems existing in the above-mentioned prior art, the present invention aims to provide a method for removing chloride ions from the wet desulfurization wastewater of thermal power plants, so as to solve the problem of recycling the desulfurization wastewater in the current limestone-gypsum wet desulfurization system.
为实现上述目的，本发明采用如下技术方案：To achieve the above object, the present invention adopts the following technical solutions:
一种火电厂湿法脱硫废水中氯离子脱除的方法，其特征在于，包含以下步骤：A method for removing chloride ions from a thermal power plant's wet desulfurization wastewater, comprising the following steps:
步骤1、脱硫废水的预处理Step 1. Pretreatment of desulfurization wastewater
对所需处理的脱硫废水进行预处理，使处理后的脱硫废水的SS<0.1mg/L、SDI<3；Pretreatment of desulfurization wastewater to be treated, so that SS<0.1mg/L and SDI<3 of the treated desulfurization wastewater;
步骤2、阴离子选择性电渗析的处理Step 2. Treatment of Anion Selective Electrodialysis
将预处理后的脱硫废水经过保安过滤器后，进入到阴离子选择性电渗析系统的脱盐室和浓缩室，进行电渗析处理，使脱硫废水中的氯离子在浓缩室富集浓缩；当浓缩室内氯离子浓度质量浓度达到8wt％时，完成电渗析；After the pretreated desulfurization wastewater passes through the security filter, it enters the desalination chamber and the concentration chamber of the anion selective electrodialysis system for electrodialysis treatment, so that the chloride ions in the desulfurization wastewater are enriched and concentrated in the concentration chamber; When the mass concentration of chloride ion concentration reaches 8wt%, electrodialysis is completed;
经电渗析处理后，脱盐室内的脱硫废水返回至石灰石-石膏湿法脱硫系统中循环利用；After electrodialysis treatment, the desulfurization wastewater in the desalination chamber is returned to the limestone-gypsum wet desulfurization system for recycling;
经电渗析处理后，浓缩室的液体进入到下一工序进行处理；After electrodialysis treatment, the liquid in the concentration chamber enters the next process for treatment;
步骤3、浓缩室液体的进一步处理Step 3. Further processing of the concentration chamber liquid
浓缩室储罐内的料液通过管路输出至蒸发结晶系统，进行蒸发，得到固体盐，蒸发所得液体返回至电渗析浓缩室储罐，实现整个石灰石-石膏湿法脱硫系统中水循环。The feed liquid in the concentration chamber storage tank is output to the evaporative crystallization system through the pipeline, evaporated to obtain solid salt, and the evaporated liquid is returned to the electrodialysis concentration chamber storage tank to realize the water circulation in the whole limestone-gypsum wet desulfurization system.
进一步地，步骤1中，所述预处理的方法为精密过滤器过滤和/或絮凝沉降。Further, in step 1, the method of the pretreatment is precision filter filtration and/or flocculation sedimentation.
进一步地，步骤2中，所述阴离子选择性电渗析系统包括电渗析膜组件、料液储罐和直流电源。所述电渗析膜组件由阳离子交换膜和选择性阴离子交换膜依次交替叠加后加上流道隔网和密封垫片构成；在电渗析膜组件的两侧固定有阳极板和阴极板，阳极板连接电源的正极、阴极板连接电源的负极；阳极板与相邻阳离子交换膜之间构成阳极室，阴极板与相邻阳离子交换膜之间构成阴极室，交替叠加的阳离子交换膜和选择性阴离子交换膜之间依次形成若干浓缩室和脱盐室的重复单元。所述料液储罐包括电极室储罐、脱盐室储罐和浓缩室储罐；所述阳极室和所述阴极室通过管道串联并连通于电极室储罐，所述脱盐室的进口和出口分别通过管道连通于脱盐室储罐，所述浓缩室的进口和出口分别通过管道连通于浓缩室储罐。Further, in step 2, the anion selective electrodialysis system includes an electrodialysis membrane assembly, a material liquid storage tank and a DC power supply. The electrodialysis membrane module is composed of a cation exchange membrane and a selective anion exchange membrane which are alternately superimposed and then added with a flow channel separator and a sealing gasket; an anode plate and a cathode plate are fixed on both sides of the electrodialysis membrane module, and the anode plates are connected The positive electrode and cathode plate of the power supply are connected to the negative electrode of the power supply; the anode chamber is formed between the anode plate and the adjacent cation exchange membrane, the cathode chamber is formed between the cathode plate and the adjacent cation exchange membrane, and the alternately superimposed cation exchange membrane and selective anion exchange membrane Several repeating units of concentration chambers and desalination chambers are formed in sequence between the membranes. The material liquid storage tank includes an electrode chamber storage tank, a desalination chamber storage tank and a concentration chamber storage tank; the anode chamber and the cathode chamber are connected in series and connected to the electrode chamber storage tank through pipes, and the inlet and outlet of the desalination chamber are connected in series. They are respectively connected to the storage tank of the desalination chamber through pipelines, and the inlet and the outlet of the concentration chamber are respectively connected to the storage tank of the concentration chamber through pipelines.
所述选择性阴离子交换膜是经过表面修饰，在普通阴离子交换膜表面喷涂有磺酸基团的选择性阴离子交换膜，可以透过单价阴离子、阻隔多价阴离子透过。The selective anion exchange membrane is a selective anion exchange membrane with sulfonic acid groups sprayed on the surface of the common anion exchange membrane after surface modification, which can pass through monovalent anions and block the permeation of multivalent anions.
所述阴离子选择性电渗析系统还设置有极室循环泵、脱盐室循环泵和浓缩室循环泵，分别连接在极室、脱盐室和浓缩室的进口和相应料液储罐之间；所述浓缩室循环泵、脱盐室循环泵和极室循环泵的流量大小匹配电渗析膜组件，达到膜面流速不低于3cm/s。The anion selective electrodialysis system is also provided with a pole chamber circulating pump, a desalination chamber circulating pump and a concentration chamber circulating pump, which are respectively connected between the inlets of the pole chamber, the desalination chamber and the concentration chamber and the corresponding material and liquid storage tanks; the The flow rate of the concentration chamber circulating pump, the desalting chamber circulating pump and the pole chamber circulating pump should match the electrodialysis membrane module, and the flow rate of the membrane surface should not be lower than 3cm/s.
进一步地，所述蒸发结晶系统包括但不限于强制循环蒸发结晶器、MVR蒸发结晶器或多效蒸发结晶设备。Further, the evaporative crystallization system includes, but is not limited to, a forced circulation evaporative crystallizer, an MVR evaporative crystallizer or a multi-effect evaporative crystallization device.
与已有技术相比，本发明的有益效果体现在：Compared with the prior art, the beneficial effects of the present invention are embodied in:
1、本发明利用预处理+阴离子选择性电渗析+蒸发结晶工艺，选择性去除火电厂湿法脱硫废水中的氯离子，可以实现脱硫废水的循环利用，节约水资源，达到了资源化综合利用的目的，减少水资源的浪费和环境污染。1. The present invention utilizes pretreatment + anion selective electrodialysis + evaporative crystallization process to selectively remove chloride ions in the wet desulfurization wastewater of thermal power plants, which can realize the recycling of desulfurization wastewater, save water resources, and achieve comprehensive utilization of resources The purpose is to reduce the waste of water resources and environmental pollution.
2、本发明的方法工艺简单、能耗低、氯离子去除率高，适于工业化推广应用。2. The method of the present invention has the advantages of simple process, low energy consumption and high chloride ion removal rate, and is suitable for industrialization and application.
附图说明Description of drawings
图1为本发明一种火电厂湿法脱硫废水中氯离子脱除工艺流程图；Fig. 1 is a process flow diagram of chloride ion removal in a kind of thermal power plant wet desulfurization waste water of the present invention;
图2为本发明阴离子选择性电渗析膜组件的膜排布图。Fig. 2 is the membrane arrangement diagram of the anion selective electrodialysis membrane module of the present invention.
具体实施方式Detailed ways
下面对本发明的实施例作详细说明，本实施例在以本发明技术方案为前提下进行实施，给出了详细的实施方式和具体的操作过程，但本发明的保护范围不限于下述的实施例。The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and a specific operation process, but the protection scope of the present invention is not limited to the following implementation. example.
实施例1Example 1
一种火电厂湿法脱硫废水中氯离子脱除的方法，包括以下步骤：A method for removing chloride ions in the wet desulfurization wastewater of thermal power plants, comprising the following steps:
步骤1、脱硫废水(pH＝6～7)通过原水泵进入预处理系统进行预处理，预处理系统为加药沉淀，加入的药剂为PAM和PAC，PAM的用量为3ppm，PAC的用量为10PPM，去除脱硫废水中的悬浮物杂质，经过处理后脱硫废水的SS＝0.05mg/L、SDI＝2。Step 1. The desulfurization wastewater (pH=6～7) enters the pretreatment system through the raw water pump for pretreatment. The pretreatment system is pretreatment with dosing and precipitation. The added agents are PAM and PAC, the dosage of PAM is 3ppm, and the dosage of PAC is 10PPM , remove the suspended solids impurities in the desulfurization wastewater, and the desulfurization wastewater after treatment has SS=0.05mg/L, SDI=2.
步骤2、经过预处理系统过滤后的脱硫废水直接输送到电渗析装置的浓缩室储罐和脱盐室储罐，电极室储罐加入3％的硫酸钠溶液；开启浓缩室循环泵、脱盐室循环泵和极室循环泵，流量设置为3m3/h；开启直流电源，进行脱硫废水中的氯离子的去除；浓缩至浓缩室内料液中氯离子质量浓度不低于8％时停止；脱盐室储罐内的料液通过管路输出返回至石灰石-脱硫废水系统中进行循环利用，浓缩室内料液(即浓缩后的压滤水)进入到蒸发结晶罐中进行进一步浓缩。Step 2. The desulfurization wastewater filtered by the pretreatment system is directly transported to the concentration chamber storage tank and the desalination chamber storage tank of the electrodialysis device, and the electrode chamber storage tank is added with 3% sodium sulfate solution; the concentration chamber circulation pump and the desalination chamber circulation pump are turned on. Pump and pole chamber circulating pump, the flow rate is set to 3m 3 /h; turn on the DC power supply to remove chloride ions in the desulfurization wastewater; stop when the concentration of chloride ions in the feed liquid in the concentration chamber is not less than 8%; desalination chamber The feed liquid in the storage tank is returned to the limestone-desulfurization wastewater system through the pipeline output for recycling, and the feed liquid in the concentration chamber (that is, the concentrated press-filtered water) enters the evaporative crystallization tank for further concentration.
步骤3、开启蒸发结晶系统，进行浓缩液的蒸发浓缩，得到固体结晶，蒸发的液体返回到电渗析浓缩室储罐继续进行浓缩。Step 3: Turn on the evaporative crystallization system, and carry out the evaporative concentration of the concentrated liquid to obtain solid crystals, and the evaporated liquid is returned to the storage tank of the electrodialysis concentration chamber for further concentration.
本实施例考察了在一定的循环流量下，不同操作条件(电渗析电压、电渗析时间)下的浓缩液氯离子浓度、脱盐液氯离子浓度、氯离子的去除率。In this example, the concentration of chloride ion in concentrated solution, the concentration of chloride ion in desalination solution, and the removal rate of chloride ion under different operating conditions (electrodialysis voltage, electrodialysis time) were investigated under a certain circulating flow rate.
表1、不同操作条件下的浓缩液氯离子质量浓度、脱盐液氯离子质量浓度、氯离子的去除率Table 1. Chloride ion mass concentration of concentrated solution, desalting solution chloride ion mass concentration, and chloride ion removal rate under different operating conditions
由上可知，本实施例利用加药预沉淀系统+阴离子选择性电渗析装置+蒸发结晶系统，可以有效去除湿法火电厂脱硫废水中的氯离子，去除率达到96％以上，可实现脱硫废水的循环利用，节约水资源，更适合进行工业化推广应用。It can be seen from the above that in this embodiment, the use of the dosing pre-precipitation system + the anion selective electrodialysis device + the evaporative crystallization system can effectively remove the chloride ions in the desulfurization wastewater of the wet thermal power plant, and the removal rate reaches more than 96%, and the desulfurization wastewater can be realized. It is more suitable for industrialization promotion and application.
实施例2Example 2
一种火电厂湿法脱硫废水中氯离子脱除的方法，包括以下步骤：A method for removing chloride ions in the wet desulfurization wastewater of thermal power plants, comprising the following steps:
步骤1、脱硫废水(pH＝6～7)通过原水泵进入预处理系统进行预处理，预处理系统为精密过滤器，过滤精度为2μm，去除脱硫废水中的悬浮物杂质，经过处理后脱硫废水的SS＝0.07mg/L、SDI＝2.5。Step 1. The desulfurization wastewater (pH=6~7) enters the pretreatment system through the raw water pump for pretreatment. The pretreatment system is a precision filter with a filtration accuracy of 2 μm to remove the suspended solid impurities in the desulfurization wastewater. After treatment, the desulfurization wastewater SS=0.07mg/L, SDI=2.5.
步骤2、经过预处理系统过滤后的脱硫废水直接输送到电渗析装置的浓缩液储罐和脱盐液储罐，电极室储罐加入3％的硫酸钠溶液；开启浓缩室循环泵、脱盐室循环泵、极室循环泵，流量设置为3m3/h；开启直流电源，进行脱硫废水中的氯离子的去除；浓缩至浓缩室内料液中氯离子质量浓度不低于8％时停止；脱盐液储罐内的料液通过管路输出返回至石灰石-脱硫废水系统中进行循环利用，浓缩室内料液(即浓缩后的压滤水)进入到蒸发结晶罐中进行进一步浓缩。Step 2. The desulfurization wastewater filtered by the pretreatment system is directly transported to the concentrated liquid storage tank and the desalted liquid storage tank of the electrodialysis device, and the electrode chamber storage tank is added with 3% sodium sulfate solution; the concentration chamber circulation pump and the desalination chamber circulation pump are turned on. Pump and pole chamber circulating pump, the flow rate is set to 3m 3 /h; turn on the DC power supply to remove chloride ions in the desulfurization wastewater; stop when the chloride ion mass concentration in the feed liquid in the concentration chamber is not less than 8%; desalination liquid The feed liquid in the storage tank is returned to the limestone-desulfurization wastewater system through the pipeline output for recycling, and the feed liquid in the concentration chamber (that is, the concentrated press-filtered water) enters the evaporative crystallization tank for further concentration.
步骤3、开启蒸发结晶系统，进行浓缩液的蒸发浓缩，得到固体结晶，蒸发的液体返回到电渗析浓缩室储罐继续进行浓缩。Step 3: Turn on the evaporative crystallization system, and carry out the evaporative concentration of the concentrated liquid to obtain solid crystals, and the evaporated liquid is returned to the storage tank of the electrodialysis concentration chamber for further concentration.
本实施例考察了经过精密过滤器预处理系统后的脱硫废水，在一定的循环流量下，不同操作条件(电渗析电压、电渗析时间)下的浓缩液氯离子浓度、脱盐液氯离子浓度、氯离子的去除率。In this example, the desulfurization wastewater after passing through the precision filter pretreatment system was investigated. Under a certain circulating flow, the chloride ion concentration of the concentrated solution, the chloride ion concentration of the desalination solution, and the The removal rate of chloride ions.
表2、不同操作条件下的浓缩液氯离子质量浓度、脱盐液氯离子质量浓度、氯离子去除率Table 2. Chloride ion mass concentration of concentrated solution, desalting solution chloride ion mass concentration, and chloride ion removal rate under different operating conditions
由上可知，本实施例利用精密过滤器预处理系统+阴离子选择性电渗析装置+蒸发结晶系统，可以有效去除湿法火电厂脱硫废水中的氯离子，去除率达到97％以上，采用精密过滤器作为预处理系统，与加药预沉淀系统效果相似，均可作为脱硫废水的预处理系统，实现脱硫废水的循环利用，节约水资源，更适合进行工业化推广应用。It can be seen from the above that in this embodiment, the use of the precision filter pretreatment system + anion selective electrodialysis device + evaporative crystallization system can effectively remove the chloride ions in the desulfurization wastewater of the wet thermal power plant, and the removal rate reaches more than 97%. As a pretreatment system, the effect is similar to that of the dosing pre-sedimentation system. It can be used as a pretreatment system for desulfurization wastewater to realize the recycling of desulfurization wastewater and save water resources. It is more suitable for industrialization and application.
以上对本发明的具体实施例进行了详细描述，但其只是作为范例，本发明并不限制于以上描述的具体实施例。对于本领域技术人员而言，任何对本发明进行的等同修改和替代也都在本发明的范畴之中。因此，在不脱离本发明的精神和范围下所作的均等变换和修改，都应涵盖在本发明的范围内。The specific embodiments of the present invention have been described above in detail, but they are only used as examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be included within the scope of the present invention.
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| CN117720242A (en) * | 2024-01-31 | 2024-03-19 | 合众思(北京)环境工程有限公司 | A method for resource-based treatment of desulfurization wastewater |
| CN117720242B (en) * | 2024-01-31 | 2025-04-29 | 合众思(北京)环境工程有限公司 | A method for resource-based treatment of desulfurization wastewater |
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