CN109179585B - A kind of method of degrading methyl violet waste water - Google Patents
A kind of method of degrading methyl violet waste water Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 71
- ZXJXZNDDNMQXFV-UHFFFAOYSA-M crystal violet Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1[C+](C=1C=CC(=CC=1)N(C)C)C1=CC=C(N(C)C)C=C1 ZXJXZNDDNMQXFV-UHFFFAOYSA-M 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000000593 degrading effect Effects 0.000 title claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 46
- 239000000706 filtrate Substances 0.000 claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 31
- 230000003647 oxidation Effects 0.000 claims abstract description 30
- 239000002244 precipitate Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 22
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 7
- 239000010439 graphite Substances 0.000 claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229940123457 Free radical scavenger Drugs 0.000 claims abstract description 5
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052737 gold Inorganic materials 0.000 claims abstract description 5
- 239000010931 gold Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 5
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 5
- 239000002516 radical scavenger Substances 0.000 claims abstract description 5
- 229910052707 ruthenium Inorganic materials 0.000 claims abstract description 5
- 239000011133 lead Substances 0.000 claims abstract description 4
- 239000003792 electrolyte Substances 0.000 claims description 26
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims description 23
- 230000001590 oxidative effect Effects 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 150000003254 radicals Chemical class 0.000 claims description 10
- WGQKYBSKWIADBV-UHFFFAOYSA-N benzylamine Chemical compound NCC1=CC=CC=C1 WGQKYBSKWIADBV-UHFFFAOYSA-N 0.000 claims description 8
- BHHGXPLMPWCGHP-UHFFFAOYSA-N Phenethylamine Chemical compound NCCC1=CC=CC=C1 BHHGXPLMPWCGHP-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000006731 degradation reaction Methods 0.000 abstract description 16
- 230000015556 catabolic process Effects 0.000 abstract description 15
- 238000006243 chemical reaction Methods 0.000 abstract description 14
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 3
- 239000012634 fragment Substances 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000000047 product Substances 0.000 abstract description 2
- 230000001376 precipitating effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 150000001448 anilines Chemical class 0.000 description 4
- 230000001699 photocatalysis Effects 0.000 description 3
- 238000004043 dyeing Methods 0.000 description 2
- 229940117803 phenethylamine Drugs 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- 241001599590 Trisopterus minutus Species 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 125000002490 anilino group Chemical group [H]N(*)C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 239000000981 basic dye Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- -1 hydroxyl radicals Chemical class 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 238000013048 microbiological method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
本发明公开了一种降解甲基紫废水的方法，该方法首先将甲基紫废水格栅沉沙，然后将甲基紫废水加热至10‑60℃，调节pH至2‑7，1小时后过滤，将过滤得到的滤液电解，采用铂片、铁、铜、金、钌、钯、石墨、铅、BDD电极中的一种作为氧化电极，采用饱和甘汞电极做参比电极，在氧化电压为1.0‑1.5V的条件下电化学氧化溶液两分钟，加入适量自由基捕获剂，使之与电解产物发生电聚合反应，生成沉淀；过滤得到澄清的液体。相比于其它降解甲基紫的方法，本方法可以使甲基紫由于电化学氧化生成的小分子碎片与自由基捕获剂结合生成一系列沉淀，在电极上发生电聚合反应生成聚合物，大大减少降解时间和电解能耗以及废水中COD值。The invention discloses a method for degrading methyl violet wastewater. The method first settles the grid of methyl violet wastewater to sand, then heats the methyl violet wastewater to 10-60 DEG C, adjusts the pH to 2-7, and after 1 hour Filtration, electrolyzing the filtrate obtained by filtration, using one of platinum sheet, iron, copper, gold, ruthenium, palladium, graphite, lead, and BDD electrodes as an oxidation electrode, using a saturated calomel electrode as a reference electrode, and at the oxidation voltage The solution was electrochemically oxidized under the condition of 1.0-1.5V for two minutes, and an appropriate amount of free radical scavenger was added to cause an electropolymerization reaction with the electrolysis product to form a precipitate; filter to obtain a clear liquid. Compared with other methods of degrading methyl violet, this method can make the small molecular fragments generated by electrochemical oxidation of methyl violet combine with the free radical scavenger to form a series of precipitates, and the electropolymerization reaction occurs on the electrode to form a polymer, which greatly reduces the amount of methyl violet. Reduce degradation time and electrolysis energy consumption as well as COD value in wastewater.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a method for degrading methyl violet wastewater.
Background
Methyl violet of formula C23H31ClN2O3And the molecular weight is 479.029. Is a bright peach red artificially synthesized basic dye, and is widely used for the paper making industry and the printing and dyeing industry, such as the dyeing of printing paper, wax paper, feather products, wheat straws, leather and the like. Methyl violet has strong fluorescence in solution, good stability, high wastewater chromaticity and poor biodegradability, and the biological accumulation in land and aquatic ecosystems has influence on the environment and human health. Therefore, treatment of methyl violet wastewater is urgent.
Currently, the studied methods for degrading methyl violet include an adsorption method, a chemical oxidation method, a Fenton method, an electrochemical oxidation method, a photocatalytic method and the like. The adsorbent is adopted to adsorb methyl violet, complex pretreatment is required, and the decolorization rate is relatively low; the chemical oxidation method adopts an oxidant to oxidize methyl violet, so that secondary pollution is easily caused; the electrochemical oxidation method is fast and simple, but is difficult to be widely applied due to high energy consumption and large power consumption. The Fenton method and the photocatalytic method utilize generated hydroxyl radicals to oxidize methyl violet, wherein the research on photocatalytic degradation of methyl violet is the most, the method has the advantages of thorough degradation, low speed, long degradation time, complex degradation process, difficult control of reaction conditions, high energy consumption, difficulty in meeting the production requirements of industrial enterprises, poor COD removal efficiency in solution and difficulty in large-scale application in actual wastewater treatment.
The aniline derivatives are monomers capable of initiating polymerization reaction by an electrochemical method, aniline free radicals are easily generated on electrodes, attack dye molecules methyl violet to generate organic molecules with larger molecular weight, the water-soluble capacity of the aniline derivatives is greatly reduced along with the increase of the molecular weight, and then the aniline derivatives are precipitated from water, and redundant aniline derivatives can be mutually polymerized to generate polyaniline to be precipitated from the water, so that the water quality can be rapidly purified, and pollutants in the water can be removed.
Disclosure of Invention
The invention aims to provide a method for degrading methyl violet wastewater, aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: a method for degrading methyl violet wastewater comprises the following steps:
(1) settling sand on the methyl violet wastewater grid;
(2) heating the methyl violet wastewater treated in the step (1) to 10-60 ℃, adjusting the pH to 2-7, and filtering after 1 hour to obtain a filtrate;
(3) taking the filtrate treated in the step (2) as an electrolyte, adopting one of platinum, iron, copper, gold, ruthenium, palladium, graphite, lead and BDD electrodes as an oxidation working electrode, adopting a saturated calomel electrode as a reference electrode, adopting a graphite electrode as a counter electrode, oxidizing for two minutes under the condition that the oxidation voltage is 1.0-1.5V, adding a free radical trapping agent, and combining broken micromolecular free radicals generated by electrolysis with the free radical trapping agent to generate flocculent precipitates; and filtering the oxidized electrolyte by using a filter membrane to obtain clear liquid.
Further, in the step 3, the free radical scavenger is selected from aniline, benzylamine and phenylethylamine, and the addition amount of the free radical scavenger is 0.2-2 ml/L of wastewater.
The invention has the beneficial effects that: the invention adopts an electrolytic method to degrade methyl violet, generates molecular fragments, partially precipitates, and partially reacts with substances such as aniline and the like added into electrolyte to generate polyaniline-like compounds, thereby reducing the COD value of the wastewater in a short time. Compared with a photocatalysis or high-voltage method, the method greatly reduces the degradation time and the electrolysis energy consumption. Is suitable for the early-stage rapid pretreatment of large-scale industrial wastewater.
Detailed Description
The invention uses methyl violet waste water (C is 100mg dm)-3) After the precipitation through a grating, the pH value of the solution is adjusted, and the precipitate is filtered to remove Fe (OH) generated in the solution2、Fe(OH)3After the metal hydroxide is precipitated, electrochemically oxidizing the methyl violet wastewater in an electrolytic cell, and adding substances such as free radical trapping agent aniline and the like until a precipitate is generated; the precipitate was filtered. The methyl violet is easy to generate electropolymerization reaction at the anode to generate polymer precipitate similar to aniline, greatly reduces the COD value of the solution, and obviously reduces the electric energy and time consumed by degradation. The COD value of the microbiological method similar to the process is about 60-400mg dm-3While the lowest COD value of the solution is only 14mg dm by adopting the electropolymerization method to degrade the methyl violet wastewater-3Left and right.
The invention degrades methyl violet in wastewater through the following two ways:
route 1: electropolymerization
Route 2: polymerizing small molecular fragment and aniline
Specifically, the method for degrading methyl violet wastewater comprises the following steps:
(1) settling sand on the methyl violet wastewater grid;
(2) heating the methyl violet wastewater treated in the step (1) to 10-60 ℃, adjusting the pH to 2-7, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Plasma forms a precipitate in the environment, filtering is carried out, and the filtrate obtained by filtering is subjected to next treatment;
(3) taking the filtrate treated in the step (2) as an electrolyte, adopting one of a platinum sheet, iron, copper, gold, ruthenium, palladium, graphite, lead and BDD electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, oxidizing for two minutes under the condition that the oxidation voltage is 1.0-1.5V, adding substances such as free radical trapping agent aniline and the like, and carrying out electro-polymerization reaction on the methyl violet wastewater to generate a precipitate; and filtering the electrolyte after the oxidation reaction by using a filter membrane to obtain clear liquid.
Example 1
(1) Methyl violet (C100 mg dm)-3) Settling sand by using a waste water grid;
(2) heating the methyl violet wastewater treated in the step (1) to 15 ℃, adjusting the pH to 5, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Forming precipitate, filtering, and treating the filtrate;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting a platinum electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.2 ml/L aniline solution into the filtrate, oxidizing for two minutes under the condition that the oxidation voltage is 1.3V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the oxidized electrolyte with a filter membrane to obtain a clear solution;
the clear liquid obtained by the degradation in this example showed a COD of 15mg dm-3。
Example 2
(1) Methyl violet (C100 mg dm)-3) Settling sand by using a waste water grid;
(2) heating the methyl violet wastewater treated in the step (1) to 15 ℃, adjusting the pH to 7, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Forming a precipitate, filtering off, and filteringThe obtained filtrate is processed in the next step;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting a gold electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.4 ml/L aniline solution into the filtrate, oxidizing for two minutes under the condition that the oxidation voltage is 1.1V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the oxidized electrolyte with a filter membrane to obtain clear liquid;
the clear liquid obtained by the degradation in this example showed a COD of 50mg dm-3。
Example 3
(1) Methyl violet (C100 mg dm)-3) Settling sand by a water grid;
(2) heating the methyl violet wastewater treated in the step (1) to 25 ℃, adjusting the pH to 6, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Forming precipitate, filtering, and treating the filtrate;
(3) taking the filtrate treated in the step (2) as an electrolyte, a graphite electrode as an oxidation electrode, a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.4 ml/L of phenylmethylamine solution into the wastewater, oxidizing the wastewater for two minutes under the condition that the oxidation voltage is 1.2V, carrying out electropolymerization reaction on the methyl violet wastewater, and filtering the oxidized electrolyte by a filter membrane to obtain a clear solution;
the clear liquid obtained by the degradation in this example showed a COD of 45mg dm-3。
Example 4
(1) Settling sand on a methyl violet (C is 100mg/L) wastewater grid;
(2) heating the methyl violet wastewater treated in the step (1) to 30 ℃, adjusting the pH to 2, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Forming precipitate, filtering, and treating the filtrate;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting a ruthenium electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.5 ml/L of phenethylamine solution into the filtrate, oxidizing the filtrate for two minutes under the condition that the oxidation voltage is 1.2V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the precipitation filter membrane to obtain clear liquid;
the clear liquid obtained by the degradation in this example showed a COD of 45mg dm-3。
Example 5
(1) Methyl violet (C100 mg dm)-3) Settling sand by using a waste water grid;
(2) heating the methyl violet wastewater treated in the step (1) to 30 ℃, adjusting the pH to 4, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Precipitating, filtering, and performing next treatment on the filtrate obtained by filtering;
(3) taking the filtrate treated in the step (2) as an electrolyte, adopting a palladium electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.5 ml/L of phenylethylamine solution into the wastewater, oxidizing the wastewater for two minutes under the condition that the oxidation voltage is 1.1V, carrying out electropolymerization reaction on the methyl violet wastewater, and filtering an oxidized electrolyte filter membrane to obtain a clear liquid;
the clear liquid obtained by the degradation in this example showed a COD of 41mg dm-3。
Example 6
(1) Settling sand on a methyl violet (C is 100mg/L) wastewater grid;
(2) heating the methyl violet wastewater treated in the step (1) to 30 ℃, adjusting the pH to 2, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Precipitating, filtering, and performing next treatment on the filtrate obtained by filtering;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting a BDD electrode as an oxidation electrode and a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.6 ml/L of phenylmethylamine solution into the filtrate, oxidizing the mixture for two minutes under the condition that the oxidation voltage is 1.1V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the oxidized electrolyte with a filter membrane to obtain clear liquid;
degradation by this exampleThen, a clear liquid was obtained, and COD was measured to be 49 mg. dm-3。
Example 7
(1) Settling sand on a methyl violet (C is 100mg/L) wastewater grid;
(2) heating the methyl violet wastewater treated in the step (1) to 35 ℃, adjusting the pH to 3, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Precipitating, filtering, and performing next treatment on the filtrate obtained by filtering;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting a lead electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.3 ml/L of phenethylamine solution into the filtrate, oxidizing the filtrate for two minutes under the condition that the oxidation voltage is 1.1V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the oxidized electrolyte with a filter membrane to obtain clear liquid;
the clear liquid obtained by the degradation in this example showed a COD of 28mg dm-3。
Example 8
(1) Settling sand on a methyl violet (C is 100mg/L) wastewater grid;
(2) heating the methyl violet wastewater treated in the step (1) to 40 ℃, adjusting the pH to 3, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Precipitating, filtering, and performing next treatment on the filtrate obtained by filtering;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting a copper electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 1 ml/L aniline solution into the filtrate, oxidizing for two minutes under the condition that the oxidation voltage is 1.3V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the oxidized electrolyte with a filter membrane to obtain clear liquid;
the clear liquid obtained by the degradation in this example showed a COD of 15mg dm-3。
Example 9
(1) Settling sand on a methyl violet (C is 100mg/L) wastewater grid;
(2) will step withHeating the methyl violet wastewater treated in the step (1) to 30 ℃, adjusting the pH to 6, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Precipitating, filtering, and performing next treatment on the filtrate obtained by filtering;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting an iron electrode as an oxidation electrode, adopting a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 0.2 ml/L of phenylmethylamine solution into the filtrate, oxidizing the phenylmethylamine solution for two minutes under the condition that the oxidation voltage is 1.2V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the oxidized electrolyte with a filter membrane to obtain clear liquid;
the clear liquid obtained by the degradation in this example showed a COD of 20mg dm-3。
Example 10
(1) Methyl violet (C100 mg dm)-3) Settling sand by using a waste water grid;
(2) heating the methyl violet wastewater treated in the step (1) to 25 ℃, adjusting the pH to 2, and filtering after 1 hour; fe in wastewater2+、Fe3+，Ca2+Precipitating, filtering, and performing next treatment on the filtrate obtained by filtering;
(3) and (3) taking the filtrate treated in the step (2) as an electrolyte, adopting a BDD electrode as an oxidation electrode and a saturated calomel electrode as a reference electrode, then simultaneously dropwise adding 2 ml/L aniline solution into the filtrate, oxidizing for two minutes under the condition that the oxidation voltage is 1.2V, and carrying out electropolymerization reaction on the methyl violet wastewater to generate a precipitate. Filtering the oxidized electrolyte with a filter membrane to obtain clear liquid;
the clear liquid obtained by the degradation in this example showed a COD of 48mg dm-3。
The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.
Claims (2)
1. A method for degrading methyl violet wastewater is characterized by comprising the following steps:
(1) settling sand on the methyl violet wastewater grid;
(2) heating the methyl violet wastewater treated in the step (1) to 10-60 ℃, adjusting the pH to 2-7, and filtering after 1 hour to obtain a filtrate;
(3) taking the filtrate treated in the step (2) as an electrolyte, adopting one of platinum, iron, copper, gold, ruthenium, palladium, graphite, lead and BDD electrodes as an oxidation working electrode, taking a saturated calomel electrode as a reference electrode, taking a graphite electrode as a counter electrode, oxidizing for 2 minutes under the condition that the oxidation voltage is 1.0-1.5V, adding a free radical trapping agent, and combining broken micromolecular free radicals generated by electrolysis with the free radical trapping agent to generate flocculent precipitates; filtering the oxidized electrolyte by using a filter membrane to obtain clear liquid; the free radical trapping agent is one of aniline, benzylamine and phenylethylamine.
2. The method for degrading methyl violet wastewater according to claim 1, wherein in the step (3), the addition amount of the free radical scavenger is 0.2-2 ml/L wastewater.
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| CN201811082438.3A CN109179585B (en) | 2018-09-17 | 2018-09-17 | A kind of method of degrading methyl violet waste water |
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| 电化学聚合;廖川平;《化学通报》;化学通报;20000218;第37-41页 * |
| 聚结晶紫修饰玻碳电极检测叶酸;杜学萍等;《河南大学学报（自然科学版）》;河南大学学报（自然科学版）;20141130;第659-662页 * |
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