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CN-118851357-B - Coking nanofiltration concentrated water treatment method and system

CN118851357BCN 118851357 BCN118851357 BCN 118851357BCN-118851357-B

Abstract

The invention relates to the technical field of water treatment, in particular to a coking nanofiltration concentrated water treatment method and a coking nanofiltration concentrated water treatment system, wherein the method comprises the steps of preparing a modified nickel plate anode electrode, a modified titanium plate cathode electrode and a multi-medium filter material in advance according to the water quality characteristics of coking nanofiltration concentrated water; the coking nanofiltration concentrated water is sent into an electrocatalytic oxidation device for treatment, the electrocatalytic oxidation device takes a modified nickel plate anode electrode as an anode electrode and a modified titanium plate cathode electrode as a cathode electrode, and the effluent of the electrocatalytic oxidation device is pumped into a multi-medium filter for filtration, wherein a multi-medium filter material is placed in the multi-medium filter. Through carrying out electrocatalytic oxidation treatment on the coking nanofiltration concentrated water, cl ‑ loses electrons at the anode and is oxidized to generate a large amount of active chlorine and other free radicals, ammonia nitrogen can be rapidly degraded, relatively stable substances react, and then a multi-medium filter is utilized for filtering, so that COD and ammonia nitrogen in the coking nanofiltration concentrated water can be economically and efficiently removed.

Inventors

  • LI ENCHAO
  • LI YONG
  • FANG HUI
  • LIU ZIMIN
  • ZHANG WEIHUA
  • YU LEI
  • GE GAOFENG
  • TONG MIN

Assignees

  • 宝武水务科技有限公司

Dates

Publication Date
20260505
Application Date
20240807

Claims (8)

  1. 1. A coking nanofiltration concentrated water treatment method, which is characterized by comprising the following steps: Pre-configuring a modified nickel plate anode electrode, a modified titanium plate cathode electrode and a multi-medium filter material aiming at the water quality characteristics of coking nanofiltration concentrated water; Sending the coking nanofiltration concentrated water into an electrocatalytic oxidation device for treatment, wherein the electrocatalytic oxidation device takes the anode electrode of the modified nickel plate as an anode electrode and takes the cathode electrode of the modified titanium plate as a cathode electrode; pumping the effluent of the electrocatalytic oxidation device into a multi-medium filter for filtering, wherein the multi-medium filter is internally provided with the multi-medium filter material; The preparation method of the modified nickel plate anode electrode comprises the following steps: selecting a nickel plate with the thickness of 1 mm, soaking the nickel plate in a sulfuric acid solution with the mass percent of 4-7% for 34-39 min to remove surface metal oxides, taking out the nickel plate, washing the nickel plate with pure water for 3-5 times, soaking the nickel plate in methanol for 20-25 min to remove surface organic matters, taking out the nickel plate, washing the nickel plate with pure water for 3-5 times, and taking out the nickel plate and then putting the nickel plate into a vacuum drying box; Preparing a copper chloride solution with the concentration of 1.9-3.8 mol/L, and adding 45-56 mg of manganese nitrate into each liter of the copper chloride solution to form a copper chloride mixed solution; immersing the nickel plate in the copper chloride mixed solution, placing the nickel plate into a hydrothermal kettle, heating the hydrothermal kettle to 170-230 ℃, reacting for 690-780 min, and taking out the nickel plate after cooling; Placing the nickel plate into a tube furnace, heating to 196-213 ℃ at 2-4 ℃ per min under argon atmosphere, maintaining for 345-490 min for vacuum carbonization, and then cooling to room temperature to prepare the modified nickel plate anode electrode; the preparation method of the modified titanium plate cathode electrode comprises the following steps: Selecting a titanium plate with the thickness of 1mm, soaking the titanium plate in a hydrochloric acid solution with the mass percent of 1-3% for 41-45 min to remove surface metal oxides, taking out the titanium plate, washing the titanium plate with pure water for 3-5 times, soaking the titanium plate in petroleum ether for 26-35 min to remove surface organic matters, taking out the titanium plate, washing the titanium plate with pure water for 3-5 times, and taking out the titanium plate and then putting the titanium plate into a vacuum drying oven; preparing 459-978 mg/L manganese sulfate solution, adding 21-26 mg of manganese chloride into each liter of manganese sulfate solution, and performing ultrasonic treatment for 20-35 min to form manganese sulfate mixed solution; And immersing the titanium plate in the manganese sulfate mixed solution for 450-490 min, then placing the titanium plate into a muffle furnace, heating the muffle furnace to 511-527 ℃ at a temperature of 5-8 ℃ per min, keeping the temperature for 65-75 min, and cooling to room temperature to obtain the modified titanium plate cathode electrode.
  2. 2. The coking nanofiltration concentrated water treatment method according to claim 1, wherein the distance between the anode electrode of the modified nickel plate and the cathode electrode of the modified titanium plate is 2-2.5 cm, and the current density is 5.1-6.3A + 。
  3. 3. The coking nanofiltration concentrated water treatment method according to claim 1, wherein the multi-medium filter material consists of ceramsite, activated carbon particles and water slag, wherein the ceramsite is placed on the lower layer of the multi-medium filter, the activated carbon particles are placed on the middle layer of the multi-medium filter, and the water slag is placed on the upper layer of the multi-medium filter.
  4. 4. The coking nanofiltration concentrated water treatment method according to claim 3, wherein the ceramic particles have a porosity of 66-68% and a density of 502-506 kg- Accounting for 10 percent of the total volume of the multi-medium filter material.
  5. 5. The coking nanofiltration concentrated water treatment method according to claim 3, wherein the activated carbon particles have a particle size of 200-300 mesh and a specific surface area of 1250-1360 And/g, the iodine value is 800-950 mg/g, and the iodine value accounts for 50% of the total volume of the multi-medium filter material.
  6. 6. The coking nanofiltration concentrated water treatment method according to claim 3, wherein the grain size of the water slag is 200-300 meshes, the water slag is molten slag discharged from a blast furnace during blast furnace ironmaking, the uniformity of granular solid residues generated after water quenching is 85% -98%, and the uniformity is 40% of the total volume of the multi-medium filter material.
  7. 7. The coking nanofiltration concentrated water treatment method according to claim 1, wherein the hydraulic retention time of the coking nanofiltration concentrated water in the electrocatalytic oxidation device is 123-178 min, and the hydraulic retention time of the coking nanofiltration concentrated water in the multi-medium filter is 45-70 min.
  8. 8. A coking nanofiltration concentrated water treatment system for realizing the coking nanofiltration concentrated water treatment method according to any one of claims 1-7, comprising a dispensing unit, an electrocatalytic oxidation device and a multi-medium filter; the dispensing unit is used for preparing a modified nickel plate anode electrode, a modified titanium plate cathode electrode and a multi-medium filter material in advance according to the water quality characteristics of the coking nanofiltration concentrated water; The electrocatalytic oxidation device is used for carrying out electrocatalytic oxidation treatment on the coking nanofiltration concentrated water, and takes the anode electrode of the modified nickel plate as an anode electrode and the cathode electrode of the modified titanium plate as a cathode electrode; the multi-medium filter is used for filtering the effluent of the electrocatalytic oxidation device, and the multi-medium filter material is placed in the multi-medium filter.

Description

Coking nanofiltration concentrated water treatment method and system Technical Field The invention relates to the technical field of water treatment, in particular to a coking nanofiltration concentrated water treatment method and system. Background Coking is a typical "two-high-cost" industry with high energy consumption, high pollution and resource. A large amount of wastewater can be discharged in the process of producing coke, and about 1 hundred million tons of coking wastewater are discharged annually in China. The coking wastewater is wastewater formed in the high-temperature carbonization of coal and the purification and chemical product refining processes, contains dozens of pollutants such as phenol, ammonia nitrogen, cyanogen, benzene, pyridine, indole, quinoline and the like, has complex components, high organic pollutant concentration and sewage chromaticity, high toxicity and very stable property, and is typical organic wastewater difficult to degrade. The national emission standard of wastewater and the related policy of energy conservation and emission reduction are gradually improved, and new emission standard of pollutants for coking chemical industry (GB 16171-2012) is issued from the 10 th month 1 th year 2012, wherein the emission standard of pollutants for coking chemical industry requires that the COD (chemical oxygen demand) of the existing enterprises is 40mg/L, the cyanide ion is 0.2mg/L and the fluoride ion is 10mg/L from the 1 th month 2015, and strict requirements are simultaneously imposed on ammonia nitrogen, total nitrogen, petroleum, volatile phenol, sulfide, polycyclic Aromatic Hydrocarbons (PAHs), benzo (a) and the like. The wastewater recycling is the final target of wastewater treatment, and is an implementation means for energy conservation and emission reduction of enterprises. The current simple coking wastewater recycling technology cannot meet the enterprise requirements, and the advanced treatment and recycling of the coking wastewater after biochemical treatment are a necessary trend. The domestic coking wastewater treatment technology adopts nanofiltration to treat the coking wastewater and then reuse the coking wastewater as circulating cooling water for iron and steel enterprises, but has the main problem of treating concentrated water generated by nanofiltration. Therefore, the concentrated water produced by the nanofiltration process is directly discharged if not treated, and the concentrated water is liable to cause great harm to the water body environment. Disclosure of Invention The invention aims to provide a coking nanofiltration concentrated water treatment method and a coking nanofiltration concentrated water treatment system, which are used for solving the treatment problem of the existing coking nanofiltration concentrated water. In order to achieve the above purpose, the invention provides a coking nanofiltration concentrated water treatment method, comprising the following steps: Pre-configuring a modified nickel plate anode electrode, a modified titanium plate cathode electrode and a multi-medium filter material aiming at the water quality characteristics of coking nanofiltration concentrated water; Sending the coking nanofiltration concentrated water into an electrocatalytic oxidation device for treatment, wherein the electrocatalytic oxidation device takes the anode electrode of the modified nickel plate as an anode electrode and takes the cathode electrode of the modified titanium plate as a cathode electrode; and pumping the effluent of the electrocatalytic oxidation device into a multi-medium filter for filtering, wherein the multi-medium filter is internally provided with the multi-medium filter material. Optionally, the preparation method of the modified nickel plate anode electrode comprises the following steps: Selecting a nickel plate with the thickness of 1mm, soaking the nickel plate in a sulfuric acid solution with the mass percent of 4-7% for 34-39 min to remove surface metal oxides, taking out, washing with pure water for 3-5 times, soaking the nickel plate in methanol for 20-25 min to remove surface organic matters, taking out, washing with pure water for 3-5 times, taking out, and then putting the nickel plate into a vacuum drying oven; preparing a copper chloride solution with the concentration of 1.9-3.8 mol/L, and adding 45-56 mg of manganese nitrate into each liter of the copper chloride solution to form a copper chloride mixed solution; immersing the nickel plate in the copper chloride mixed solution, putting the nickel plate into a hydrothermal kettle, heating the hydrothermal kettle to 170-230 ℃, reacting 690-780 min, and taking out the nickel plate after cooling; and (3) placing the nickel plate into a tube furnace, heating to 196-213 ℃ at 2-4 ℃ per min under the argon atmosphere, maintaining 345-490min for vacuum carbonization, and then cooling to room temperature to obtain the modified nickel plate anode electrode. Optio