CN111762851A - Iron-carbon micro-electrolysis coupling electrochemical water treatment device and treatment method - Google Patents
Iron-carbon micro-electrolysis coupling electrochemical water treatment device and treatment method Download PDFInfo
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- CN111762851A CN111762851A CN202010636781.9A CN202010636781A CN111762851A CN 111762851 A CN111762851 A CN 111762851A CN 202010636781 A CN202010636781 A CN 202010636781A CN 111762851 A CN111762851 A CN 111762851A
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- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 230000008878 coupling Effects 0.000 title claims abstract description 18
- 238000010168 coupling process Methods 0.000 title claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001556 precipitation Methods 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000005273 aeration Methods 0.000 claims abstract description 9
- 239000006228 supernatant Substances 0.000 claims abstract description 9
- 239000002351 wastewater Substances 0.000 claims description 32
- 239000000945 filler Substances 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000005373 porous glass Substances 0.000 claims description 10
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 8
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000011152 fibreglass Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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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
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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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
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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
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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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
- C02F2001/46133—Electrodes characterised by the material
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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Abstract
The invention relates to an iron-carbon micro-electrolysis coupling electrochemical water treatment device and a treatment method, which comprises an iron-carbon micro-electrolysis tank, a precipitation tank, a Y-shaped filter and a drying device, wherein an electrode box is arranged on the upper layer of the drying device, a drawer-type iron-carbon stuffing box is arranged on the middle layer of the drying device, an aeration pipe is arranged on the bottom layer of the precipitation tank, an outlet at the bottom of the iron-carbon micro-electrolysis tank is communicated with the upper part of the precipitation tank, a supernatant outlet at the upper layer of the precipitation tank is connected with an inlet of the Y-shaped filter, the outlet at the bottom of the precipitation tank is divided into 2 paths, 1 path is communicated with the upper layer of the iron-carbon micro-electrolysis tank, the other 1 path is communicated with the inlet of the Y-shaped filter, and a first outlet of the Y-shaped filter is connected with the inlet of the drying device.
Description
Technical Field
The invention belongs to the field of water treatment, relates to a treatment device for organic wastewater, and particularly relates to an iron-carbon microelectrolysis coupling electrochemical water treatment device and a treatment method.
Background
At present, the iron-carbon micro-electrolysis is widely applied to the field of organic wastewater treatment. Iron-carbon micro-electrolysis degrades organic matters by using the potential difference between iron and carbon, thereby achieving the effect of water treatment.
However, most of the existing methods directly introduce organic wastewater into an iron-carbon micro-electrolysis cell, and because the potential difference of iron-carbon micro-electrolysis is small, the organic wastewater is slowly degraded. In addition, iron and carbon are easy to separate out from the iron-carbon micro-electrolysis filler, and the iron and carbon are mainly Fe3+The ionic form and the C elementary substance form exist in the wastewater, can cause secondary pollution to the water quality, and are not beneficial to the environmental protection requirement.
How to treat organic wastewater by adopting an iron-carbon micro-electrolysis mode and reduce the contents of iron and carbon as much as possible after the treatment is finished is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing an iron-carbon micro-electrolysis coupling electrochemical water treatment device and a treatment method, which can carry out advanced treatment on organic wastewater difficult to degrade, have high treatment speed and high effluent quality and also have a function of removing suspended matters in the wastewater.
The technical means adopted by the invention are as follows.
An iron-carbon micro-electrolysis coupling electrochemical water treatment device at least comprises: the iron-carbon micro-electrolysis bath comprises an electrode box arranged on the upper layer, a drawer type iron-carbon stuffing box arranged on the middle layer and an aeration pipe arranged on the bottom layer; the bottom outlet of the iron-carbon micro-electrolysis tank is communicated with the upper part of the precipitation tank; the upper clear liquid outlet of the upper layer of the settling tank is connected with the inlet of the Y-shaped filter, the outlet at the bottom of the settling tank is divided into 2 paths, 1 path is communicated with the upper layer of the iron-carbon micro-electrolysis tank, and the other 1 path is communicated with the inlet of the Y-shaped filter; and the first outlet of the Y-shaped filter is connected with the inlet of the drying device.
Furthermore, a frame of the electrode box is made of a porous glass steel plate, an anode and a cathode in the electrode box are detachably arranged on a top plate of the electrode box, the anode is a titanium-based metal oxide electrode, and the cathode is a graphite felt electrode.
Furthermore, the iron carbon stuffing box comprises a clamping portion and a containing portion which are connected, the clamping portion comprises a clamping side plate, the clamping side plate is a glass fiber reinforced plastic plate, a rubber gasket for sealing is arranged on the edges of the clamping side plate and the side plate in a surrounding mode, the containing portion is a rectangular porous glass fiber reinforced plastic frame, an containing space is formed by the rectangular porous glass fiber reinforced plastic frame and the clamping side plate in a surrounding mode, at least 1 layer of porous glass fiber reinforced plastic partition plate is arranged in the containing space, and iron carbon stuffing is placed in the containing space.
Further, handles are arranged on the outer sides of the card and the side plates.
Furthermore, the top of the iron-carbon micro-electrolysis bath is provided with an exhaust hole.
Further, the volume of the iron-carbon filler in the iron-carbon filler box is 70-90% of the volume of the filler box.
An iron-carbon micro-electrolysis coupling electrochemical water treatment method comprises the following steps:
step a: the organic wastewater enters an iron-carbon micro-electrolysis tank, and an electrode box is started to be electrified for 10-20min for electrolysis;
step b: stopping electrifying the electrode box, and performing micro-electrolysis on the organic wastewater treated in the step a in an iron-carbon micro-electrolysis tank for 60-150 min;
step c: after the micro-electrolysis reaction is finished, pumping all liquid out of the bottom of the iron-carbon micro-electrolysis tank and entering a settling tank;
step d: the retention time of the liquid in the precipitation tank is 10-20 min;
step e: after full precipitation, the supernatant of the precipitation tank passes through a Y-shaped filter, impurities intercepted by the Y-shaped filter enter a drying device for drying, 10-20% of turbid liquid at the bottom of the precipitation tank is controlled to flow back to the iron-carbon micro-electrolysis tank for reaction, and the rest turbid liquid enters the Y-shaped filter.
Furthermore, the COD removal rate in the organic wastewater is 90-99%, the chroma removal rate is 70-90%, the suspended matter removal rate is 90-99%, and the BOD/COD value can be increased by 0.1-0.3.
Further, the dry material formed after the dry material enters the drying device to be dried is used as a raw material of the iron-carbon filler.
The beneficial effects produced by the invention are as follows.
1. The invention couples the electrode box with the iron-carbon micro-electrolysis bath, firstly degrades the organic matters difficult to degrade by the electrode box, then turns off the power supply of the electrode box, and then degrades the small molecular organic matters by the iron-carbon micro-electrolysis. Therefore, compared with the existing simple iron-carbon micro-electrolysis bath, the invention has the advantages of high degradation speed and high treatment efficiency.
2. The iron-carbon micro-electrolysis bath adopts the extractable iron-carbon stuffing box and the electrode box, thereby being convenient for replacing the stuffing and cleaning the electrode.
3. The main materials of the iron-carbon micro-electrolysis tank, the iron-carbon stuffing box and the electrode box are all made of glass fiber reinforced plastics, so that the iron-carbon micro-electrolysis tank, the iron-carbon stuffing box and the electrode box are high in strength and corrosion resistant.
4. The invention adopts a filtering mode after precipitation, can remove COD and suspended matters of the organic wastewater, improves the biodegradability, and can use the dry material obtained by drying after filtration as the raw material of the iron-carbon micro-electrolysis filler to realize the recycling.
5. The iron-carbon micro-electrolysis bath of the invention produces Fe (OH)3Due to Fe (OH)3The floc has flocculation effect, and can remove suspended matters in the wastewater.
Drawings
FIG. 1 is a schematic structural diagram of a processing apparatus according to the present invention.
Fig. 2 is a schematic structural diagram of the drawer type iron carbon stuffing box of the present invention.
Fig. 3 is a schematic structural view in the direction of a-a in fig. 2.
Detailed Description
The invention provides an iron-carbon micro-electrolysis coupling electrochemical water treatment device, which comprises an iron-carbon micro-electrolysis tank 11, a precipitation tank 21 and a drying box 31.
An electrode box 12 is arranged on the upper layer of the iron-carbon micro-electrolysis tank 11, a drawer type iron-carbon stuffing box 13 is arranged on the middle layer, and a porous aeration pipe 15 is inserted on the bottom layer.
The frame of the electrode box 12 is made of porous glass fiber reinforced plastic, and the anode and the cathode in the electrode box 12 are detachably fixed on the top plate of the electrode box 12 and can be pulled out for cleaning and replacement. The anode used a titanium-based metal oxide electrode and the cathode used a graphite felt electrode.
The drawer-type iron-carbon stuffing box 13 includes a fastening portion and a receiving portion connected to each other. As shown in fig. 2 and 3, the engaging portion includes an engaging side plate 131 made of a glass fiber reinforced plastic. In order to prevent water leakage in the iron-carbon micro-electrolysis bath, a rubber gasket 132 is provided around the edges of the card and side plates 131. To facilitate the pushing and pulling, a handle 135 is provided on the outside of the card and side plate 131. The receiving portion is a rectangular porous glass fiber reinforced plastic frame 133, which encloses a receiving space with the fastening side plate 131, at least 1 layer of porous glass fiber reinforced plastic partition 134 is disposed in the receiving space, and the iron carbon filler 14 is disposed in the receiving space. Preferably, the volume of the iron carbon stuffing 14 is 70 to 90 percent of the volume of the iron carbon stuffing box 13. When the volume of the iron-carbon filler 14 is less than 70% of the volume of the iron-carbon filler box 13, the iron-carbon filler 14 should be supplemented in time.
The porous aeration pipe 15 can be made of UPVC material, the outer diameter of the pipe is 50-100mm, and the diameter of the hole on the porous aeration pipe 15 is 3-5 mm.
The iron-carbon micro-electrolysis bath 11 is wholly cuboid and made of glass fiber reinforced plastics. The top plate is provided with an exhaust hole, the exhaust hole is externally communicated with an exhaust pipe 16, and the outer diameter of the exhaust pipe is 100mm and 150 mm.
An outlet at the bottom of the iron-carbon micro-electrolysis tank 11 is communicated with the upper part (namely an upper clear liquid layer) of the settling tank 21, an outlet at the bottom (namely a turbid liquid layer) of the settling tank 21 is divided into 2 paths, and 1 path is communicated with the top plate of the iron-carbon micro-electrolysis tank 11 and is used for refluxing liquid to the iron-carbon micro-electrolysis tank 11; the other 1 path is communicated with the inlet of the Y-shaped filter 22.
The supernatant layer of the settling tank 21 is provided with a supernatant outlet which is connected to an inlet of the Y-filter 22, a first outlet of the Y-filter 22 is connected to an inlet of the drying box 31, and a second outlet of the Y-filter 22 is used for discharging filtered clean water.
The drying oven 31 dries the supernatant, and the formed dry material can be used as a raw material of the iron-carbon filler.
The invention also provides an iron-carbon micro-electrolysis coupling electrochemical water treatment method by applying the treatment device. At least comprises the following steps:
step a: the organic wastewater enters an iron-carbon micro-electrolysis bath 11, an electrode box 12 is started to be electrified for 10-20min for electrolysis;
step b: stopping electrifying the electrode box 12, and micro-electrolyzing the organic wastewater treated in the step a in the iron-carbon micro-electrolysis bath 11 for 60-150 min;
step c: after the micro-electrolysis reaction is finished, pumping all liquid out of the bottom of the iron-carbon micro-electrolysis tank 11 and entering a settling tank 21;
step d: the retention time of the liquid in the precipitation tank 21 is 10-20 min;
step e: after full precipitation, the supernatant of the precipitation tank passes through the Y-shaped filter 22, impurities intercepted by the Y-shaped filter 22 enter the drying box 31 for drying, the turbid liquid at the bottom of the precipitation tank 21 is controlled to flow back to the iron-carbon micro-electrolysis tank 11 by 10-20% (volume fraction) for reaction, and the rest turbid liquid enters the Y-shaped filter 22.
In the step a, the electrode box 12 is firstly started to electrolyze the organic wastewater, the electrolytic process of the step mainly aims at the macromolecular organic matters which are difficult to degrade in the organic wastewater, the macromolecular organic matters with the molecular weight of more than 500 are firstly degraded into the micromolecular organic matters with the molecular weight of less than 50, and the micromolecular organic matters can be degraded through the electrode box 12.
And (c) after the power supply of the motor box 12 is turned off in the step (b), the iron-carbon micro-electrolysis starts to play a main role, and the micro-electrolysis degrades the micromolecule organic matters into inorganic salt and hydrated carbon dioxide.
In the iron-carbon micro-electrolysis tank 11, when the organic wastewater is contacted with the iron-carbon filler, the pH value is adjusted to 4-6, and the following electrochemical reaction occurs:
anode Fe-2e → Fe2+
Cathode 2H++2e→H2
When aerated, the following reactions occur:
anode: 4Fe2++O2+4H+→2H2O+4Fe3+
Cathode: o is2+4H++4e→2H2O
O2+2H2O+4e→4OH-
The organic wastewater and the iron-carbon filler are subjected to the reaction to generate Fe2+And Fe3+In the vicinity of the electrode chamber, the following reactions occur again:
anode: h2O→·OH+H++e
Cathode: o is2+2H++2e→H2O2
Fe2++H2O2→Fe3++·OH+OH-
The oxidation potential of iron-carbon microelectrolysis is in the range of 1-1.2V. OH is a hydroxyl radical, has the oxidation potential of 2.8V, has extremely strong oxidation capacity, and can almost oxidize all organic matters. Fe at pH > 43+Will generate Fe (OH)3Flocs, which have flocculation effect on pollutants in the wastewater.
In step d, the turbid liquid at the bottom of the precipitation tank 21 mainly contains Fe (OH)3And a large amount of Fe3+The turbid liquid is 10-20% of reflux, wherein Fe is contained in the turbid liquid3+Will participate in the electrolytic reaction (Fe) of the electrode box 123+Will catalyze H2O2OH) is produced, the reaction is accelerated. Meanwhile, the supernatant fluid of the precipitation tank 21 and the other part of the bottom turbid liquid enter a Y-shaped filter 22 for filtration, the Y-shaped filter 22 can remove suspended matters and chroma, the impurities retained by the Y-shaped filter 22 enter a drying box 31 for drying, and the obtained dry materials contain Fe (OH)3Is used as main component and may be used as material for iron-carbon stuffing.
Because the waste water is organic waste water, the pollutants are mainly organic solid matters, the binder is required to be added for high-temperature sintering in the preparation of the iron-carbon filler, the organic solid matters can be decomposed into ash (few) and water in the sintering process, and the pollutants can hardly leak due to the presence of the binder, so that the preparation of the iron-carbon filler by using the obtained dry materials hardly influences the subsequent electrolysis process.
Through the treatment, the COD removal rate in the organic wastewater is 90-99%, the chroma can be removed by 70-90%, the suspended matter removal rate is 90-99%, the BOD/COD value can be improved by 0.1-0.3, and the biodegradability of the wastewater is improved.
Specific examples are given below.
The iron-carbon micro-electrolysis bath 11 is cuboid and made of glass fiber reinforced plastics. The top is provided with an exhaust pipe 16, and the outer diameter of the pipe is 150 mm.
The volume of the iron-carbon filler 14 in the iron-carbon filler box 13 is 70 percent of the volume of the iron-carbon filler box 13. When the volume of the filler in the iron-carbon stuffing box is less than 70 percent of the volume of the stuffing box, the filler is supplemented.
The porous aeration pipe 15 is made of UPVC material, the outer diameter of the pipe is 100mm, and the diameter of the upper hole of the aeration pipe is 5 mm.
An iron-carbon stuffing box 13 is inserted into the iron-carbon micro-electrolysis tank 11, and after air is introduced into the aeration pipe 15, the treatment is carried out according to the following steps:
(1) the organic wastewater enters an iron-carbon micro-electrolysis bath 11, an electrode box 12 is started to be electrified for 20min for electrolysis;
(2) stopping electrifying the electrode box 12, and performing micro-electrolysis on the organic wastewater treated in the step (1) in the iron-carbon micro-electrolysis tank 11 for 150 min;
(3) after the micro-electrolysis reaction is finished, pumping all liquid out of the bottom of the iron-carbon micro-electrolysis tank 11 and entering a settling tank 21;
(4) the retention time of the liquid in the precipitation tank 21 is 20 min;
(5) after full precipitation, the supernatant of the precipitation tank passes through the Y-shaped filter 22, impurities intercepted by the Y-shaped filter 22 enter the drying box 31 to be dried to form a dry material serving as a raw material of the iron-carbon micro-filler 14, 20% of turbid liquid at the bottom of the precipitation tank 21 is controlled to flow back to the iron-carbon micro-electrolysis tank 11 to participate in reaction, and the rest turbid liquid enters the Y-shaped filter 22.
When the organic wastewater is contacted with the iron-carbon filler, the pH value is adjusted to 4, and the following electrochemical reaction is carried out:
anode Fe-2e → Fe2+
Cathode 2H++2e→H2
When aerated, the following reactions occur:
anode: 4Fe2++O2+4H+→2H2O+4Fe3+
Cathode: o is2+4H++4e→2H2O
O2+2H2O+4e→4OH-
Fe is generated by the reaction between the organic wastewater and the iron-carbon filler 142+And Fe3+In turn, the following reactions occur in the vicinity of the electrode chamber 12:
anode: h2O→·OH+H++e
Cathode: o is2+2H++2e→H2O2
Fe2++H2O2→Fe3++·OH+OH-
In the treatment process carried out by the parameters, the removal rate of COD in the organic wastewater is 99 percent, the removal rate of chroma is 90 percent, the removal rate of suspended matters is 99 percent, the value of BOD/COD can be improved by 0.3, and the biodegradability of the wastewater is improved.
Claims (9)
1. An iron-carbon microelectrolysis coupling electrochemical water treatment device is characterized by at least comprising:
the iron-carbon micro-electrolysis bath (11) is characterized in that an electrode box (12) is arranged on the upper layer of the iron-carbon micro-electrolysis bath (11), a drawer type iron-carbon stuffing box (13) is arranged on the middle layer, and an aeration pipe is arranged on the bottom layer;
the bottom outlet of the iron-carbon micro-electrolysis tank (11) is communicated with the upper part of the sedimentation tank (21);
the upper layer of the settling tank (21) is connected with the inlet of the Y-shaped filter (22), the outlet at the bottom of the settling tank (21) is divided into 2 paths, 1 path is communicated with the upper layer of the iron-carbon micro-electrolysis tank (11), and the other 1 path is communicated with the inlet of the Y-shaped filter (22);
a drying device, wherein the first outlet of the Y-shaped filter (22) is connected with the inlet of the drying device.
2. The iron-carbon microelectrolysis coupling electrochemical water treatment device as recited in claim 1, wherein a frame of the electrode box (12) is made of a porous glass steel plate, an anode and a cathode in the electrode box (12) are detachably arranged on a top plate of the electrode box (12), the anode is a titanium-based metal oxide electrode, and the cathode is a graphite felt electrode.
3. The iron-carbon micro-electrolysis coupling electrochemical water treatment device according to claim 1, wherein the iron-carbon stuffing box (13) comprises a clamping portion and a containing portion which are connected, the clamping portion comprises a clamping side plate (131), the clamping side plate (131) is a glass fiber reinforced plastic plate, a rubber gasket (132) for sealing is arranged around the edge of the clamping side plate (131), the containing portion is a rectangular porous glass fiber reinforced plastic frame (133) which forms a containing space with the clamping side plate (131), at least 1 layer of porous glass fiber reinforced plastic partition plates (134) is arranged in the containing space, and iron-carbon stuffing (14) is arranged in the containing space.
4. An iron-carbon micro-electrolysis coupling electrochemical water treatment device as claimed in claim 3, wherein a handle (135) is further provided outside the card and the side plate (131).
5. The iron-carbon microelectrolysis coupling electrochemical water treatment device as recited in claim 1, wherein a vent hole is formed at the top of the iron-carbon microelectrolysis tank (11).
6. An iron-carbon micro-electrolysis coupling electrochemical water treatment device according to any one of claims 1 to 5, characterized in that the volume of iron-carbon filler (14) in the iron-carbon stuffing box (13) is 70-90% of the stuffing box volume.
7. An iron-carbon microelectrolysis coupling electrochemical water treatment method is characterized by comprising the following steps:
step a: the organic wastewater enters an iron-carbon micro-electrolysis tank (11), an electrode box (12) is started to be electrified for 10-20min for electrolysis;
step b: stopping electrifying the electrode box (12), and performing micro-electrolysis on the organic wastewater treated in the step a within 60-150min of the residence time of the organic wastewater in the iron-carbon micro-electrolysis tank (11);
step c: after the micro-electrolysis reaction is finished, pumping all liquid from the bottom of the iron-carbon micro-electrolysis tank (11) and entering a settling tank (21);
step d: the retention time of the liquid in the precipitation tank (21) is 10-20 min;
step e: after full precipitation, the supernatant of the precipitation tank passes through a Y-shaped filter (22), impurities intercepted by the Y-shaped filter (22) enter a drying device for drying, 10-20% of turbid liquid at the bottom of the precipitation tank (21) is controlled to flow back to the iron-carbon micro-electrolysis tank (11) for reaction, and the rest turbid liquid enters the Y-shaped filter (22).
8. The iron-carbon microelectrolysis coupling electrochemical water treatment method as recited in claim 7, wherein the COD removal rate in the organic wastewater is 90-99%, the chroma removal rate is 70-90%, the suspended matter removal rate is 90-99%, and the BOD/COD value can be increased by 0.1-0.3.
9. The iron-carbon microelectrolysis coupling electrochemical water treatment method as recited in claim 7, wherein the dry material formed after the dry material enters the drying device and is dried is used as a raw material of the iron-carbon filler (14).
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