WO2022143014A1 - 一种硝酸钠废水资源化处理***及方法 - Google Patents
一种硝酸钠废水资源化处理***及方法 Download PDFInfo
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- WO2022143014A1 WO2022143014A1 PCT/CN2021/135563 CN2021135563W WO2022143014A1 WO 2022143014 A1 WO2022143014 A1 WO 2022143014A1 CN 2021135563 W CN2021135563 W CN 2021135563W WO 2022143014 A1 WO2022143014 A1 WO 2022143014A1
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- reverse osmosis
- sodium nitrate
- nanofiltration
- treatment
- electrodialysis
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- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000002351 wastewater Substances 0.000 title claims abstract description 29
- 235000010344 sodium nitrate Nutrition 0.000 title claims abstract description 27
- 239000004317 sodium nitrate Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000012528 membrane Substances 0.000 claims abstract description 38
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 37
- 238000000909 electrodialysis Methods 0.000 claims abstract description 25
- 238000001728 nano-filtration Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000010612 desalination reaction Methods 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000010979 pH adjustment Methods 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims description 13
- 238000004064 recycling Methods 0.000 claims description 11
- 238000009287 sand filtration Methods 0.000 claims description 6
- 239000003014 ion exchange membrane Substances 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 150000007513 acids Chemical class 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000013505 freshwater Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4614—Current
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Definitions
- the invention relates to the field of industrial sewage treatment, in particular to a system and a process for recycling sodium nitrate wastewater.
- the object of the present invention is to overcome the deficiencies of the prior art, and to provide a sodium nitrate wastewater recycling treatment system and method with the advantages of good quality of recovered water, high recovery rate and low system energy consumption, so as to solve the problem of recycling sodium nitrate wastewater problem.
- the solution of the present invention is:
- the invention provides a sodium nitrate waste water resource treatment system, which includes a pretreatment unit, a membrane separation unit, an electrodialysis device and a bipolar membrane device connected in sequence, and the pretreatment unit includes a pH adjustment pool, a sand Filtration, security filtration; the membrane separation unit includes a nanofiltration device and a reverse osmosis device, the water outlets of the nanofiltration device and the reverse osmosis device are respectively connected with the produced water reuse equipment, and the concentrated solution outlet of the nanofiltration device is connected to the reverse osmosis device.
- the inlet of the osmosis device is connected, and the concentrated solution outlet of the reverse osmosis device is connected with the inlet of the electrodialysis device, and the concentrated solution outlet and the water outlet of the electrodialysis device are respectively connected with the inlet and the reverse outlet of the bipolar membrane device through pipes.
- the inlet of the permeation device is connected, the water outlet of the bipolar membrane device is connected to the inlet of the electrodialysis device through a pipeline, and the alkali liquor outlet and the acid liquor outlet of the bipolar membrane device are respectively connected to the reused alkali liquor tank and acid liquor tank.
- the ion exchange membranes in the electrodialysis equipment and the bipolar membrane equipment are preferably homogeneous membranes.
- the invention also provides a method for utilizing the above-mentioned treatment system to recycle the sodium nitrate wastewater.
- the method includes: first, adjusting the pH of the sodium nitrate wastewater through a pH adjustment tank to be weakly acidic to remove CO 3 2- and HCO 3 in the sample -After that, it is filtered by sand filtration and security filtration to remove large particles of impurities and suspended solids. After filtration, the produced water enters the nanofiltration device and reverse osmosis device for desalination treatment, and the produced water is recovered and reused by the desalination treatment of the nanofiltration and reverse osmosis device.
- the concentrated solution with a salt content greater than 40,000 mg/L obtained by nanofiltration desalination enters the reverse osmosis device and electrodialysis equipment for concentration and desalination treatment, and the concentrated solution with a salt content greater than 120,000 mg/L is processed into the bipolar membrane equipment to convert the concentrated solution.
- the effluent with a salt content of less than 40,000 mg/L is returned to the reverse osmosis device for further treatment; the effluent with a salt content of less than 80,000 mg/L is returned to the reverse osmosis device after treatment by the bipolar membrane equipment.
- Electrodialysis equipment further concentrates desalination treatment.
- the salt content of the concentrated solution produced by the reverse osmosis equipment is greater than 80000 mg/L.
- the sodium nitrate wastewater recycling treatment system and method of the present invention solves the problem of recycling sodium nitrate wastewater, and has the characteristics of good recovered water quality, high recovery rate and low system energy consumption.
- Fig. 1 is a schematic diagram of the process flow of a method for treating sodium nitrate wastewater as a resource according to the present invention.
- a sodium nitrate waste water recycling treatment system of the present invention is sequentially connected to a pretreatment unit, a membrane separation unit, an electrodialysis device 6 and a bipolar membrane device 7, and the pretreatment unit includes a pH adjustment tank 1, Sand filter 2, security filter 3.
- the membrane separation unit includes a nanofiltration device 4 and a reverse osmosis device 5, and the nanofiltration device 4 and the reverse osmosis device 5 have a concentrate inlet, a fresh water outlet, and a concentrate outlet.
- the ion exchange membranes in the electrodialysis device 6 and the bipolar membrane device 7 are homogeneous membranes.
- the water outlets of the nanofiltration device 4 and the reverse osmosis device 5 are respectively connected with the product water reuse equipment, the concentrated solution outlet of the nanofiltration device 4 is connected with the inlet of the reverse osmosis device 5, and the concentrated solution outlet of the reverse osmosis device 5 is connected to the electricity.
- the inlet of the dialysis equipment 6 is connected, the concentrated liquid discharge port and the water outlet of the electrodialysis equipment 6 are respectively connected with the inlet of the bipolar membrane equipment 7 and the inlet of the reverse osmosis device 5 through the pipeline, and the water outlet of the bipolar membrane equipment 7 is connected with the electrodialysis device through the pipeline.
- the inlet of the device 6 is connected, and the alkali liquor outlet and the acid liquor outlet of the bipolar membrane device 7 are respectively connected to the reused alkali liquor tank and acid liquor tank.
- Example 1 The sodium nitrate wastewater recycling system of the present invention is used to treat the sodium nitrate wastewater produced by a certain production refining catalyst: the sodium nitrate content in the wastewater is 2.2%, the CO 3 2- content is 140 mg/L, and the HCO 3 - content is 1500 mg /L, SO 4 2- content 10mg/L.
- the sand filtration device, security filtration device, nanofiltration device, reverse osmosis equipment, electrodialysis equipment and bipolar membrane equipment in the present invention are all well-known components in the art, and the specific treatment process is as follows: First, the sodium nitrate wastewater is pumped into pH The pH of the adjustment tank is adjusted to 3.25, and after removing carbonate and bicarbonate, the pH is adjusted back to 7.02; the treated wastewater enters the sand filter, security filter, nanofiltration device, and reverse osmosis device in turn through the filter water supply pump.
- Reverse osmosis device desalination treatment to get the product water recovery and reuse, through nanofiltration desalination to obtain concentrated liquid with a salt content of more than 40000mg/L, and then enter the reverse osmosis device and electrodialysis equipment for concentration and desalination treatment, and obtain a concentrated solution with a salt content of more than 120000mg/L.
- the concentrated liquid enters the bipolar membrane equipment to convert the concentrated liquid into acids and bases of 1 mol/L or more and then reuse it, and the effluent with a salt content of less than 40000 mg/L is returned to the reverse osmosis device for further treatment; after being treated by the bipolar membrane equipment
- the effluent with the salt content less than 80000mg/L is returned to the electrodialysis equipment for further concentration and desalination treatment.
- the backwash conditions of sand filtration and security filter are that the pressure difference before and after is greater than 0.1MPa and 0.2MPa, respectively, and the concentration ratio is controlled to 1:1.
- the electrodialysis maintained a current density of 4.5A/dm 2 , and the water quality of each equipment was shown in Table 1.
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
本发明公开一种硝酸钠废水资源化处理***，该***包括依次连接预处理设备、膜分离设备、电渗析设备和双极膜设备，预处理设备包括pH调节池(1)、砂滤(2)、保安过滤(3)，膜分离设备包括纳滤装置(4)和反渗透装置(5)，纳滤装置(4)和反渗透装置具有浓缩液入口、淡水排出口和浓缩液排出口。本发明硝酸钠废水资源化处理方法，硝酸钠废水经过经pH调节池、砂滤装置、保安过滤装置过滤，进入纳滤装置(4)和反渗透装置(5)进行处理，由纳滤和反渗透装置(4～5)脱盐处理后生成的淡水回收，浓缩液进入电渗析设备(6)再进行浓缩处理，最后进入双极膜设备(7)将浓缩液转化为酸和碱。本发明处理***及方法，具有回收水品质好、回收率高和***能耗低的优势。
Description
本发明涉及工业污水处理领域，具体涉及的是一种硝酸钠废水资源化处理***及工艺。
随着我国社会经济的高速发展，水资源的紧缺正在逐渐成为制约我国可持续发展战略的主要因素之一。为保障国家水资源品质，加大了水污染防治力度。
炼化催化剂生产企业在生产催化剂的同时，也消耗并排出大量含硝酸钠的高盐废水。若未经处理直接排放，不仅是水资源的极大浪费，更对自然环境和人体健康造成危害。因此，对硝酸钠废水实现资源化处理势在必行。
目前，针对高盐废水成熟的技术包括电驱离子膜技术、膜分离技术、蒸发结晶技术等。由于蒸发技术能耗、占地和投资较高，组合膜技术在废水资源化处理方面的应用比较广泛，但整体存在工艺不够完善、回收率较低、能耗高等不足。因此，要从清洁生产、资源化回收等角度来***分析组合膜技术的工艺特点，使硝酸钠废水治理具有更好的社会效益和市场竞争力。
发明内容
本发明的目的在于克服现有技术的不足，提供一种具有回收水品质好、回收率高和***能耗低的优势的硝酸钠废水资源化处理***及方法，以解决硝酸钠废水资源化处理难题。
为了达成上述目的，本发明的解决方案是：
本发明提供了一种硝酸钠废水资源化处理***，该***包括依次连接预处理单元、膜分离单元、电渗析设备和双极膜设备，所述预处理单元包括依次连接的pH调节池、砂滤、保安过滤；所述膜分离单元包括纳滤装置和反渗透装置，所述纳滤装置和反渗透装置的出水口分别与产水回用设备连接，纳滤装置的浓缩液排出口与反渗透装置的入口连接，反渗透装置的浓缩液排出口与所述的电渗析设 备的入口连接，所述的电渗析设备的浓缩液排出口、出水口分别通过管道与双极膜设备入口、反渗透装置的入口相连，双极膜设备出水口通过管道与电渗析设备的入口相连，双极膜设备的碱液出口和酸液出口分别与回用的碱液罐和酸液罐相连。
本发明上述硝酸钠废水资源化处理***中，所述电渗析设备和双极膜设备中的离子交换膜优选为均相膜。
本发明还提供了一种用上述处理***资源化处理硝酸钠废水的方法，该方法包括：首先将硝酸钠废水经pH调节池调节废水pH呈弱酸性去除样品中的CO
3
2-和HCO
3
-后，再经砂滤、保安过滤过滤去除大颗粒杂质和悬浮物，过滤后产水进入纳滤装置和反渗透装置进行脱盐处理，由纳滤和反渗透装置脱盐处理得到产水回收回用，经纳滤脱盐得到含盐量大于40000mg/L的浓缩液依次进入反渗透装置、电渗析设备浓缩脱盐处理，处理得到含盐量大于120000mg/L的浓缩液进入双极膜设备将浓缩液转化为大于等于1mol/L的酸和碱后回用，处理得到含盐量小于40000mg/L的出水返回反渗透装置进一步处理；经双极膜设备处理后得到含盐量小于80000mg/L的出水返回电渗析设备进一步浓缩脱盐处理。
本发明上述方法中，反渗透设备产生的浓缩液含盐量大于80000mg/L。
与现有的硝酸钠废水处理方法相比，本发明硝酸钠废水资源化处理***及方法，解决了硝酸钠废水资源化处理难题，具有回收水品质好、回收率高和***能耗低特点。
图1为本发明一种硝酸钠废水资源化处理方法的工艺流程示意图。
图中1：pH调节池、2：砂滤、3：保安过滤、4：纳滤装置、5：反渗透装置、6：电渗析设备、7：双极膜设备。
为了进一步解释本发明的技术方案，下面通过具体实施例来对本发明进行详细阐述。
本发明一种硝酸钠废水资源化处理***，如图1所示，依次连接预处理单元、 膜分离单元、电渗析设备6和双极膜设备7，所述预处理单元包括pH调节池1、砂滤2、保安过滤3。所述膜分离单元包括纳滤装置4和反渗透装置5，所述纳滤装置4和反渗透装置5具有浓缩液入口、淡水排出口和浓缩液排出口。优选的，电渗析设备6和双极膜设备7中的离子交换膜为均相膜。纳滤装置4和反渗透装置5的出水口分别与产水回用设备连接，纳滤装置4的浓缩液排出口与反渗透装置5的入口连接，反渗透装置5的浓缩液排出口与电渗析设备6的入口连接，电渗析设备6的浓缩液排出口、出水口分别通过管道与双极膜设备7入口、反渗透装置5的入口相连，双极膜设备7出水口通过管道与电渗析设备6的入口相连，双极膜设备7的碱液出口和酸液出口分别与回用的碱液罐和酸液罐相连。
实施例1采用本发明硝酸钠废水资源化处理***对某生产炼化催化剂产生的硝酸钠废水进行处理：废水中的硝酸钠含量2.2％，CO
3
2-含量140mg/L，HCO
3
-含量1500mg/L，SO
4
2-含量10mg/L。
本发明中的砂滤装置、保安过滤装置、纳滤装置、反渗透化设备、电渗析设备和双极膜设备均为本领域的公知部件，具体处理过程如下：首先硝酸钠废水经泵入pH调节池调节pH至3.25，去除碳酸根和碳酸氢根后，调回pH为7.02；处理后废水经过滤器供水泵依次进入砂滤、保安过滤、纳滤装置、反渗透装置内，由纳滤和反渗透装置脱盐处理得到产水回收回用，经纳滤脱盐得到含盐量大于40000mg/L的浓缩液依次进入反渗透装置、电渗析设备浓缩脱盐处理，处理得到含盐量大于120000mg/L的浓缩液进入双极膜设备将浓缩液转化为大于等于1mol/L的酸和碱后回用，处理得到含盐量小于40000mg/L的出水返回反渗透装置进一步处理；经双极膜设备处理后得到含盐量小于80000mg/L的出水返回电渗析设备进一步浓缩脱盐处理。砂滤和保安过滤器反洗条件分别为前后压差大于0.1MPa、0.2MPa，控制浓淡比1：1，纳滤和反渗透反洗条件分别为进膜压力升高至2.6MPa、4.3Mpa，电渗析保持电流密度4.5A/dm
2，各个设备产水水质如表1所示。
表1产水水质
由表1可知，纳滤产水和反渗透产水水质均达到《城市污水再生利用工业用水标准》(GBT19923-2005)，可用于工厂回用，电渗析酸液和碱液浓度分别可达到1.23mol/L、1.15mol/L，可回用于工厂生产工序，废水全部实现资源化回收，回收率为100％。
上述实施例和图式并非限定本发明的产品形态和式样，任何所属技术领域的普通技术人员对其所做的适当变化或修饰，皆应视为不脱离本发明的专利范畴。
Claims (4)
- 一种硝酸钠废水资源化处理***，其特征在于，包括依次连接预处理单元、膜分离单元、电渗析设备和双极膜设备，所述预处理单元包括依次连接的pH调节池、砂滤、保安过滤；所述膜分离单元包括纳滤装置和反渗透装置，所述纳滤装置和反渗透装置的出水口分别与产水回用设备连接，纳滤装置的浓缩液排出口与反渗透装置的入口连接，反渗透装置的浓缩液排出口与所述的电渗析设备的入口连接，所述的电渗析设备的浓缩液排出口、出水口分别通过管道与双极膜设备入口、反渗透装置的入口相连，双极膜设备出水口通过管道与电渗析设备的入口相连，双极膜设备的碱液出口和酸液出口分别与回用的碱液罐和酸液罐相连。
- 根据权利要求1所述的硝酸钠废水资源化处理***，其特征在于，所述电渗析设备和双极膜设备中的离子交换膜为均相膜。
- 一种用权利要求1所述的处理***资源化处理硝酸钠废水的方法，其特征在于，包括：首先将硝酸钠废水经pH调节池调节废水pH呈弱酸性去除样品中的CO 3 2-和HCO 3 -后，再经砂滤、保安过滤过滤去除大颗粒杂质和悬浮物，过滤后产水进入纳滤装置和反渗透装置进行脱盐处理，由纳滤和反渗透装置脱盐处理得到产水回收回用，经纳滤脱盐得到含盐量大于40000mg/L的浓缩液依次进入反渗透装置、电渗析设备浓缩脱盐处理，处理得到含盐量大于120000mg/L的浓缩液进入双极膜设备将浓缩液转化为大于等于1mol/L的酸和碱后回用，处理得到含盐量小于40000mg/L的出水返回反渗透装置进一步处理；经双极膜设备处理后得到含盐量小于80000mg/L的出水返回电渗析设备进一步浓缩脱盐处理。
- 根据权利要求3所述的方法，其特征在于，反渗透设备产生的浓缩液含盐量大于80000mg/L。
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| CN112979007B (zh) * | 2021-04-22 | 2022-11-22 | 成都泓润科技有限公司 | 酸性含盐废水的处理方法 |
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