CN116425374B - Wastewater treatment system and method based on Fenton iron mud regeneration - Google Patents
Wastewater treatment system and method based on Fenton iron mud regeneration Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 474
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 230
- 230000008929 regeneration Effects 0.000 title claims abstract description 78
- 238000011069 regeneration method Methods 0.000 title claims abstract description 78
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 92
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 85
- 239000007788 liquid Substances 0.000 claims abstract description 63
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 61
- 230000003647 oxidation Effects 0.000 claims abstract description 50
- 238000004062 sedimentation Methods 0.000 claims abstract description 40
- 239000000243 solution Substances 0.000 claims abstract description 39
- 239000002351 wastewater Substances 0.000 claims abstract description 35
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 230000003197 catalytic effect Effects 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011259 mixed solution Substances 0.000 claims abstract description 22
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000006228 supernatant Substances 0.000 claims abstract description 10
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 33
- 230000007246 mechanism Effects 0.000 claims description 16
- 239000000047 product Substances 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 230000002378 acidificating effect Effects 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 125000004151 quinonyl group Chemical group 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 6
- 239000005416 organic matter Substances 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 239000010842 industrial wastewater Substances 0.000 description 9
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- -1 iron ions Chemical class 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 description 2
- 239000001263 FEMA 3042 Substances 0.000 description 2
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000010668 complexation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 235000014413 iron hydroxide Nutrition 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 2
- 229940033123 tannic acid Drugs 0.000 description 2
- 235000015523 tannic acid Nutrition 0.000 description 2
- 229920002258 tannic acid Polymers 0.000 description 2
- 239000012028 Fenton's reagent Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000005588 protonation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Landscapes
- 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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides a wastewater treatment system and a wastewater treatment method based on Fenton iron mud regeneration, and belongs to the technical field of wastewater treatment. The system sequentially comprises a mixing tank, a reaction tank, an oxidation tank, a neutralization tank and a sedimentation tank, wherein the mixing tank is used for mixing Fenton iron mud obtained after Fenton treatment of wastewater with clear water to obtain a Fenton iron mud solution; the reaction tank is used for the regeneration reaction of Fenton iron mud to obtain regenerated iron mud mixed liquor; the oxidation pond is used for carrying out Fenton catalytic oxidation reaction on the regenerated iron mud mixed solution to obtain a Fenton catalytic oxidation reaction product; the neutralization pond is used for neutralization reaction of Fenton catalytic oxidation reaction products to obtain neutralization reaction products; the sedimentation tank is used for solid-liquid separation of the neutralization reaction product to obtain supernatant and precipitated iron mud. The method is implemented based on the system. The system and the method not only realize the resource utilization of Fenton iron mud, but also can efficiently remove the organic matters in the wastewater, ensure the stability of water outlet, and have the advantages of fewer procedures, easy operation, high safety and low treatment cost.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a wastewater treatment system and a wastewater treatment method based on Fenton iron mud regeneration.
Background
With the rapid development of economy in China in recent years, the production of industrial wastewater is increased dramatically, and the annual industrial wastewater discharge in China exceeds 2.1X10 at present 10 Tons. The industrial wastewater has complex pollutant composition, high toxicity and high concentration, belongs to organic wastewater difficult to degrade, and the residue of the complex pollutants in a water body and the possibly induced environmental problems thereof become the focus of attention. Industrial wastewater treatment is a difficult point of sewage treatment technology, and currently common treatment methods include a physical method, a biological method and a chemical method. Although the treatment technologies can meet the water quality standard, the common characteristics are high energy consumption and high material consumption; while advanced oxidation techniques are described inThe method has obvious advantages in the field of treating the organic wastewater difficult to degrade.
The Fenton technology combines the characteristics of oxidization and coagulation, is easy to obtain reagents, can be operated at normal temperature and normal pressure, is simple and convenient to operate, and is considered as one of the most promising wastewater treatment technologies. Although the Fenton process is widely applied to the treatment of refractory wastewater, a large amount of iron-containing surplus sludge (called as Fenton iron sludge for short) is generated when the refractory wastewater is treated, for example, when the Fenton process is used for treating the effluent of the three-stage treatment of papermaking wastewater, the total iron content is 3 multiplied by 10 4 m 3 The wastewater will produce 2X 10 3 m 3 Fenton iron mud with water content of 45%. Fenton iron mud has great harm to the environment, is dangerous waste, and heavy metals and organic pollutants deposited in the Fenton iron mud can be immersed into the environment under mild conditions to cause pollution. The generation of a large amount of Fenton iron mud limits the expansion application of the Fenton process.
Disclosure of Invention
In view of the above, the invention provides a wastewater treatment system and a wastewater treatment method based on Fenton iron mud regeneration, which not only realize the resource utilization of Fenton iron mud, but also can efficiently remove wastewater organic matters, ensure the water outlet stability, and have fewer procedures, easy operation, high safety and low treatment cost, thereby being more suitable for practical use.
In order to achieve the first purpose, the technical scheme of the wastewater treatment system based on Fenton iron mud regeneration provided by the invention is as follows:
the wastewater treatment system based on Fenton iron mud regeneration provided by the invention sequentially comprises a mixing tank, a reaction tank, an oxidation tank, a neutralization tank and a sedimentation tank,
the mixing tank is used for mixing Fenton iron mud obtained after Fenton treatment of wastewater with clear water to obtain Fenton iron mud solution;
the reaction tank is used for the regeneration reaction of the Fenton iron mud to obtain regenerated iron mud mixed solution;
the oxidation pond is used for carrying out Fenton catalytic oxidation reaction on the regenerated iron mud mixed solution to obtain a Fenton catalytic oxidation reaction product;
the neutralization pond is used for neutralization reaction of Fenton catalytic oxidation reaction products to obtain neutralization reaction products;
the sedimentation tank is used for solid-liquid separation of the neutralization reaction product to obtain supernatant and precipitated iron mud.
The wastewater treatment system based on Fenton iron mud regeneration provided by the invention can be further realized by adopting the following technical measures.
Preferably, the wastewater treatment system based on Fenton iron mud regeneration also comprises a stirring mechanism,
the stirring mechanism is arranged in the mixing tank and/or the reaction tank and/or the oxidation tank and/or the neutralization tank and/or the sedimentation tank.
Preferably, the wastewater treatment system based on Fenton iron mud regeneration further comprises a first valve and/or a second valve and/or a third valve and/or a fourth valve,
the mixing tank, the reaction tank, the oxidation tank, the neutralization tank and the sedimentation tank are sequentially communicated, wherein,
the liquid outlet of the mixing tank is higher than the liquid inlet of the reaction tank;
the liquid outlet of the reaction tank is higher than the liquid inlet of the oxidation tank;
the liquid outlet of the oxidation tank is higher than the liquid inlet of the neutralization tank;
the liquid outlet of the neutralization tank is higher than the liquid inlet of the sedimentation tank;
the first valve is arranged between the liquid outlet of the mixing tank and the liquid inlet of the reaction tank, the second valve is arranged between the liquid outlet of the reaction tank and the liquid inlet of the oxidation tank, the third valve is arranged between the liquid outlet of the oxidation tank and the liquid inlet of the neutralization tank, and the fourth valve is arranged between the liquid outlet of the neutralization tank and the liquid inlet of the sedimentation tank.
Preferably, the wastewater treatment system based on Fenton iron mud regeneration further comprises a fifth valve,
the sedimentation tank is also communicated with the reaction tank, and the fifth valve is arranged on a pipeline communicated between the sedimentation tank and the reaction tank.
Preferably, the wastewater treatment system based on Fenton iron mud regeneration also comprises a spiral feeding mechanism,
the spiral feeding mechanism is arranged in a pipeline communicated between the sedimentation tank and the reaction tank.
In order to achieve the second purpose, the technical scheme of the wastewater treatment method based on Fenton iron mud regeneration provided by the invention is as follows:
the wastewater treatment method based on Fenton iron mud regeneration provided by the invention is realized by applying the wastewater treatment system based on Fenton iron mud regeneration provided by the invention, and comprises the following steps:
step 1: mixing Fenton iron mud obtained after Fenton wastewater treatment with clear water to obtain a Fenton iron mud solution, wherein the adding volume of the clear water is the same as the volume of a Fenton medicament ferrous sulfate solution;
step 2: the Fenton iron mud solution enters a Fenton iron mud regeneration reaction tank, an additive is added, the pH value of the Fenton iron mud solution is regulated to be acidic by adding acid, and a regeneration reaction of the Fenton iron mud is carried out to obtain a regenerated iron mud mixed solution, wherein the addition mass of the additive is 0.4-1.0 times of the mass of the Fenton iron mud solution, and the additive is a quinone structure organic matter;
step 3: the regenerated iron mud mixed solution automatically flows to a Fenton oxidation pond, the pH is controlled to be 3-4, hydrogen peroxide is added, and a Fenton catalytic oxidation reaction is carried out, so that a Fenton catalytic oxidation reaction product is obtained;
step 4: flowing the Fenton catalytic oxidation reaction product into a Fenton neutralization tank, adding alkali for neutralization reaction, and adjusting to neutrality, wherein the pH of the effluent reaches the standard to obtain a neutralization reaction product;
step 5: the neutralization reaction product automatically flows to a Fenton sedimentation tank, iron mud in the neutralization reaction product is precipitated to obtain a solid-liquid separation product, and the solid-liquid separation product comprises supernatant and precipitated iron mud, wherein the supernatant is discharged after reaching standards;
step 6: and (3) inputting the precipitated iron mud into a Fenton iron mud regeneration reaction tank, continuing to perform the reaction in the step (2-5) until the circulation times of the Fenton iron mud reach saturation, and performing post-treatment on the Fenton iron mud to obtain a post-treatment product of the Fenton iron mud.
The wastewater treatment method based on Fenton iron mud regeneration provided by the invention can be further realized by adopting the following technical measures.
Preferably, the Fenton iron mud solution enters a Fenton iron mud regeneration reaction tank, an additive is added, the pH value of the Fenton iron mud solution is regulated to be acidic by adding acid, the regeneration reaction of the Fenton iron mud is carried out, and in the step of obtaining the regenerated iron mud mixed solution, the acid is concentrated sulfuric acid, and when the pH value of the Fenton iron mud solution is regulated to be acidic, the pH value of the Fenton iron mud solution is 2-4.
Preferably, the regenerated iron mud mixed solution automatically flows to a Fenton oxidation pond, the pH is controlled to be 3-4, hydrogen peroxide is added, fenton catalytic oxidation reaction is carried out, and in the step of obtaining a Fenton catalytic oxidation reaction product, the pH control method is that acid or alkali is added for adjustment.
Preferably, the precipitated iron mud is input into a Fenton iron mud regeneration reaction tank, the reaction in the step 2-5 is continuously carried out until the Fenton iron mud circulation times reach saturation, and after the Fenton iron mud is subjected to aftertreatment, the Fenton iron mud circulation times reach saturation standard in the step process of obtaining the aftertreatment product of the Fenton iron mud, wherein the COD value of treated effluent of the sedimentation tank exceeds the wastewater discharge standard.
Preferably, the precipitated iron mud is input into a Fenton iron mud regeneration reaction tank, the reaction in step 2-5 is continuously carried out until the Fenton iron mud circulation times reach saturation, and after-treatment is carried out on the Fenton iron mud, so that a post-treatment product of the Fenton iron mud is obtained, and the method for carrying out the after-treatment on the Fenton iron mud comprises the following steps:
the Fenton iron mud enters a filter press to be subjected to filter pressing, so that a mud cake of the Fenton iron mud is obtained;
and drying, solidifying, incinerating or carrying out outward transportation treatment on the mud cake of the Fenton iron mud.
Compared with the prior art, the wastewater treatment system and the wastewater treatment method based on Fenton iron mud regeneration provided by the invention have the beneficial effects that: (1) The wastewater treatment method based on Fenton iron mud regeneration has the advantages of low energy consumption, low cost, easy operation and high safety, and the reaction in each step pool is fully reacted, so that the reaction progress is controlled, the water quality monitoring is facilitated, the wastewater treatment effect is ensured, and the industrial wastewater discharge standard is met; (2) The regenerated Fenton iron mud is used as a catalyst to enter a Fenton oxidation pond to participate in Fenton catalytic oxidation reaction, the Fenton oxidation efficiency is not obviously reduced due to repeated regeneration and cyclic utilization, the addition of Fenton reagents and the discharge of Fenton iron mud can be reduced, and the running cost of a Fenton process is reduced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic diagram of the overall structure of a wastewater treatment system based on Fenton iron mud regeneration provided by the embodiment of the invention (in fig. 1, a mixing tank, a reaction tank, an oxidation tank, a neutralization tank and a sedimentation tank are sequentially arranged from left to right);
fig. 2 is a schematic diagram of the overall structure of a wastewater treatment system based on Fenton iron mud regeneration according to an embodiment of the present invention.
Detailed Description
In view of the above, the invention provides a wastewater treatment system and a wastewater treatment method based on Fenton iron mud regeneration, which not only realize the resource utilization of Fenton iron mud, but also can efficiently remove wastewater organic matters, ensure the water outlet stability, and have fewer procedures, easy operation, high safety and low treatment cost, thereby being more suitable for practical use.
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following is a wastewater treatment system and a treatment method based on Fenton iron mud regeneration, which are provided by the invention, with reference to the accompanying drawings and the preferred embodiment, and the specific implementation, structure, characteristics and effects thereof are described in detail below. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
The term "and/or" is herein merely an association relation describing an associated object, meaning that three relations may exist, e.g. a and/or B, specifically understood as: the composition may contain both a and B, and may contain a alone or B alone, and any of the above three cases may be provided.
Wastewater treatment system based on Fenton iron mud regeneration
Referring to fig. 1, the wastewater treatment system based on Fenton iron mud regeneration provided by the embodiment of the invention sequentially comprises a mixing tank, a reaction tank, an oxidation tank, a neutralization tank and a sedimentation tank. The mixing pool is used for mixing Fenton iron mud obtained after the wastewater is treated by Fenton with clear water to obtain Fenton iron mud solution; the reaction tank is used for the regeneration reaction of Fenton iron mud to obtain regenerated iron mud mixed liquor; the oxidation pond is used for carrying out Fenton catalytic oxidation reaction on the regenerated iron mud mixed solution to obtain a Fenton catalytic oxidation reaction product; the neutralization pond is used for neutralization reaction of Fenton catalytic oxidation reaction products to obtain neutralization reaction products; the sedimentation tank is used for solid-liquid separation of the neutralization reaction product to obtain supernatant and precipitated iron mud.
Compared with the prior art, the wastewater treatment system based on Fenton iron mud regeneration provided by the embodiment of the invention has the beneficial effects that: (1) The wastewater treatment method based on Fenton iron mud regeneration has the advantages of low energy consumption, low cost, easy operation and high safety, and the reaction in each step pool is fully reacted, so that the reaction progress is controlled, the water quality monitoring is facilitated, the wastewater treatment effect is ensured, and the industrial wastewater discharge standard is met; (2) The regenerated Fenton iron mud is used as a catalyst to enter a Fenton oxidation pond to participate in Fenton catalytic oxidation reaction, the Fenton oxidation efficiency is not obviously reduced due to repeated regeneration and cyclic utilization, the addition of Fenton reagents and the discharge of Fenton iron mud can be reduced, and the running cost of a Fenton process is reduced.
Wherein, wastewater treatment system based on Fenton iron mud regeneration still includes rabbling mechanism. The stirring mechanism is arranged in the mixing tank and/or the reaction tank and/or the oxidation tank and/or the neutralization tank and/or the sedimentation tank. In this case, the mixing and reaction effects of the mixing and/or reaction and/or oxidation and/or neutralization and/or sedimentation tanks can be increased.
The wastewater treatment system based on Fenton iron mud regeneration further comprises a first valve and/or a second valve and/or a third valve and/or a fourth valve. The mixing tank, the reaction tank, the oxidation tank, the neutralization tank and the sedimentation tank are sequentially communicated, wherein the liquid outlet of the mixing tank is higher than the liquid inlet of the reaction tank; the liquid outlet of the reaction tank is higher than the liquid inlet of the oxidation tank; the liquid outlet of the oxidation tank is higher than the liquid inlet of the neutralization tank; the liquid outlet of the neutralization tank is higher than the liquid inlet of the sedimentation tank; the first valve is arranged between the liquid outlet of the mixing tank and the liquid inlet of the reaction tank, the second valve is arranged between the liquid outlet of the reaction tank and the liquid inlet of the oxidation tank, the third valve is arranged between the liquid outlet of the oxidation tank and the liquid inlet of the neutralization tank, and the fourth valve is arranged between the liquid outlet of the neutralization tank and the liquid inlet of the sedimentation tank. Under the condition, after the treatment of the previous treatment tank is finished, as the liquid outlet of the previous treatment tank is higher than the liquid inlet of the next treatment tank, only the valve between the previous treatment tank and the next treatment tank is required to be opened, and the treatment liquid in the previous treatment tank can automatically flow to the next treatment tank, so that the cost is saved.
Wherein, waste water treatment system based on Fenton iron mud regeneration still includes the fifth valve. The sedimentation tank is also communicated with the reaction tank, and a fifth valve is arranged on a pipeline communicated between the sedimentation tank and the reaction tank. Under the condition, the Fenton iron mud is subjected to post-treatment, and the obtained Fenton iron mud can be conveniently recycled to the reaction tank, and the operation is simple and convenient.
Wherein, waste water treatment system based on Fenton iron mud regeneration still includes spiral feeding mechanism. The spiral feeding mechanism is arranged in a pipeline communicated between the sedimentation tank and the reaction tank. Under this kind of circumstances, utilize this screw feeding mechanism, can make Fenton iron mud carry out the aftertreatment, the Fenton iron mud that obtains circulates to the reaction tank more conveniently to, can avoid Fenton iron mud to be held back in the sedimentation tank.
Wastewater treatment method based on Fenton iron mud regeneration
Referring to fig. 2, the wastewater treatment method based on Fenton iron mud regeneration provided by the embodiment of the invention is implemented by applying the wastewater treatment system based on Fenton iron mud regeneration provided by the embodiment of the invention, and the wastewater treatment method based on Fenton iron mud regeneration comprises the following steps:
step 1: mixing Fenton iron mud obtained after Fenton treatment of wastewater with clean water to obtain a Fenton iron mud solution, wherein the added volume of the clean water is the same as the volume of a Fenton medicament ferrous sulfate solution;
step 2: the Fenton iron mud solution enters a Fenton iron mud regeneration reaction tank, an additive is added, the pH value of the Fenton iron mud solution is regulated to be acidic by adding acid, and a regeneration reaction of the Fenton iron mud is carried out, so that a regenerated iron mud mixed solution is obtained, wherein the addition mass of the additive is 0.4-1.0 times of the mass of the Fenton iron mud solution, and the additive is organic matters with quinone structures. Wherein, the substances containing quinone structures have the dual functions of complexation and reduction, and can inhibit Fe 3+ Precipitation and acceleration of Fe 3+ And (5) reduction. The action mechanism between the substances containing the quinone structures and the ferric iron oxyhydroxide mainly comprises: protonation, complexation dissolution and reduction are by the following mechanisms:
complexing and reducing Fe by utilizing organic matter containing quinone structure 3+ The pretreatment of Fenton iron mud is omitted, meanwhile, the lost iron ions can be utilized by organic matters containing quinone structures in the wastewater, and the formed complex is further reduced, so that the Fenton iron mud is fully regenerated.
Step 3: the regenerated iron mud mixed solution automatically flows to a Fenton oxidation pond, the pH value is controlled to be 3-4, hydrogen peroxide is added, and Fenton catalytic oxidation reaction is carried out, so that Fenton catalytic oxidation reaction is obtainedThe product should be obtained. The method can fully and uniformly mix the wastewater, the regenerated Fenton iron mud solution and the hydrogen peroxide, reduce the process flow and shorten the reaction time. In the Fenton oxidation tank, the regenerated Fenton iron mud solution comprises free Fe 3+ 、Fe 3+ Fe formed after reduction 2+ The method can catalyze the hydrogen peroxide to generate homogeneous Fenton oxidation reaction, and in addition, the undissolved surface containing the iron hydroxide can generate heterogeneous Fenton oxidation reaction with the hydrogen peroxide, and the two reactions synergistically enhance the oxidation effect, so that the method has a good treatment effect on industrial wastewater with complex components and difficult biodegradation, and has the following specific action mechanism:
free Fe 2+ And Fe (Fe) 3+ Catalytic hydrogen peroxide reacts as follows:
| Fe2+ + H2O2 → Fe3+ + ·OH + OH- |
| Fe3+ + H2O2 → Fe (HO2)2+ + H+ |
| FeOH2+ + H2O2 →Fe(OH)(HO2)+ + H+ |
| FeOH2+→ Fe2+ + HO2· |
| Fe(OH)(HO2)+ →Fe2+ + OH- + HO2· |
| RH+ & OH- & gtR- & gtH 2O- & gtcontinuing oxidation |
The undissolved surface containing the iron hydroxide undergoes heterogeneous Fenton reaction:
| ≡Fe3+OH + H2O2 ↔ (H2O2)S |
| (H2O2)S → ≡Fe2+ + H2O + HO2· |
| ≡Fe2+ + H2O2 → ≡Fe3+OH + H2O + HO· |
| ≡Fe2+ + O2 → ≡Fe3+OH + HO2· |
| ≡Fe3+OH + HO2·/ O2-· → ≡Fe2+ + H2O/ OH- + O2 |
| ≡Fe2+ + HO· → ≡Fe3+OH |
| RH+ & OH- & gtR- & gtH 2O- & gtcontinuing oxidation |
Fe 2+ Reacts with hydrogen peroxide to generate hydroxyl free radical (OH) which attacks C-H, N-H and O-H bond in wastewater organic matter (RH) to make the hydroxyl free radical and the OH dehydrogenate to form R, wherein the R has high activity to be further oxidized and finally mineralized into CO 2 And H 2 And O greatly reduces the COD concentration of the wastewater. The Fenton oxidation reaction efficiency depends largely on the pH of the solution, and the optimum pH is generally about 3. The regenerated Fenton iron mud solution in the step 2 is acidic, so that the addition of acid liquor in a Fenton oxidation pond can be reduced, when the pH of treated wastewater is 6-9, the pH adjustment of mixed liquor in the Fenton oxidation pond can be omitted, and the operation flow is simplified.
Step 4: and (3) enabling a Fenton catalytic oxidation reaction product to automatically flow into a Fenton neutralization tank, adding alkali for neutralization reaction, adjusting to be neutral, and obtaining a neutralization reaction product after the pH of effluent reaches the standard. In the Fenton neutralization tank, the pH is increased, fe 3+ The hydrolysate and colloidal substances in the wastewater are coagulated to form colloidal particles and form flocs under the stirring action, and the suspension containing the flocs enters a sedimentation tank for solid-liquid separation, so that a large amount of suspended substances in the water can be removed. In this example, neutralization is carried out by adding alkaliIn the reaction, the alkali is calcium hydroxide or sodium hydroxide.
Step 5: the neutralization reaction product automatically flows to a Fenton sedimentation tank, iron mud in the neutralization reaction product is precipitated to obtain a solid-liquid separation product, and the solid-liquid separation product comprises supernatant fluid and precipitated iron mud, wherein the supernatant fluid is discharged after reaching standards;
step 6: and (3) inputting the precipitated iron mud into a Fenton iron mud regeneration reaction tank, continuing to perform the reaction in the step (2-5) until the circulation times of the Fenton iron mud reach saturation, and performing post-treatment on the Fenton iron mud to obtain a post-treatment product of the Fenton iron mud.
Compared with the prior art, the wastewater treatment method based on Fenton iron mud regeneration provided by the embodiment of the invention has the beneficial effects that: (1) The wastewater treatment method based on Fenton iron mud regeneration has the advantages of low energy consumption, low cost, easy operation and high safety, and the reaction in each step pool is fully reacted, so that the reaction progress is controlled, the water quality monitoring is facilitated, the wastewater treatment effect is ensured, and the industrial wastewater discharge standard is met; (2) The regenerated Fenton iron mud is used as a catalyst to enter a Fenton oxidation pond to participate in Fenton catalytic oxidation reaction, the Fenton oxidation efficiency is not obviously reduced due to repeated regeneration and cyclic utilization, the addition of Fenton reagents and the discharge of Fenton iron mud can be reduced, and the running cost of a Fenton process is reduced.
Wherein, the Fenton iron mud solution enters a Fenton iron mud regeneration reaction tank, an additive is added, and acid is added to adjust the pH value of the Fenton iron mud solution to be acidic, and the regeneration reaction of the Fenton iron mud is carried out, so that the pH value of the Fenton iron mud solution is 2-4 when the pH value of the Fenton iron mud solution is adjusted to be acidic in the step of obtaining the regenerated iron mud mixed solution by using concentrated sulfuric acid as the acid. The acid can accelerate the dissolution of the iron mud to obtain free Fe 3+ . The reaction equation of this step is: 2Fe (OH) 3 +H 2 SO 4 =Fe 2 (SO 4 ) 3 +6H 2 O。
Wherein, the regenerated iron mud mixed solution automatically flows to a Fenton oxidation pond, the pH value is controlled to be 3-4, hydrogen peroxide is added, and Fenton catalytic oxidation reaction is carried out, and in the step of obtaining a Fenton catalytic oxidation reaction product, the pH value is controlled by adding acid or alkali.
And (2) inputting the precipitated iron mud into a Fenton iron mud regeneration reaction tank, and continuing to perform the reaction in the steps 2-5 until the Fenton iron mud circulation times reach saturation, and performing post-treatment on the Fenton iron mud to obtain a post-treatment product of the Fenton iron mud, wherein in the step of obtaining the post-treatment product of the Fenton iron mud, the Fenton iron mud circulation times reach saturation standard, and the COD value of water treated by the precipitation tank exceeds the wastewater discharge standard.
The method for carrying out post-treatment on the Fenton iron mud comprises the following steps of:
the Fenton iron mud enters a filter press for filter pressing to obtain a mud cake of the Fenton iron mud;
drying, solidifying, burning or carrying out outward transportation treatment on mud cakes of Fenton iron mud.
Examples
Referring to fig. 2, this embodiment is a wastewater treatment method based on Fenton iron mud regeneration, comprising the steps of:
(1) Fenton iron mud mixing: filtering the muddy water mixed solution obtained after Fenton treatment of secondary effluent of certain petrochemical wastewater to obtain Fenton iron mud, wherein the addition amount of clear water is 253.17 times of the dry weight of the Fenton iron mud, and the Fenton iron mud and clear water are mixed and stirred to prepare a Fenton iron mud solution;
(2) Fenton iron mud regeneration reaction: and (3) feeding the Fenton iron mud solution in the step (1) into a Fenton iron mud regeneration reaction tank, adding tannic acid solution, wherein the addition amount of the tannic acid is 0.4 time of the weight of the iron mud, adding acid to adjust the pH of the mixed solution to 2, mixing and stirring for 2 h at normal temperature, and carrying out the regeneration reaction of the Fenton iron mud.
(3) Oxidation reaction: the regenerated iron mud mixed solution in the step (2) automatically flows to a Fenton oxidation tank, certain petrochemical wastewater secondary effluent enters the reaction tank, hydrogen peroxide is added, the regenerated iron mud solution reacts with the hydrogen peroxide to generate strong-oxidability OH, and the strong-oxidability OH is added and electrons are transferred through substitution with organic mattersThe degradation-resistant macromolecular organic matters in the wastewater are oxidized and decomposed into micromolecular organic matters, even mineralized into CO by converting into bond breaking and other ways 2 And H 2 O；
(4) Neutralization reaction: the oxidation treatment effluent in the step (3) automatically flows into a Fenton neutralization tank, alkali is added for neutralization reaction, the pH of the effluent of the wastewater is adjusted to reach the standard, and the alkali is calcium hydroxide or sodium hydroxide;
(5) Precipitation reaction: the neutralized wastewater in the step (4) automatically flows to a Fenton sedimentation tank, and iron mud in the neutralized wastewater is precipitated to realize solid-liquid separation;
(6) And (3) a circulation system: after the first cycle, the detection result of the sedimentation tank: the COD concentration of the effluent is 38.32 mg/L, the removal rate is 67.80%, the effluent reaches the standard, the precipitated iron mud mixed solution is input into a Fenton iron mud regeneration reaction tank through a pipeline, the reaction in the steps (2) - (5) is continued, the process can realize 2 times of circulation, and the wastewater reaches the standard and is discharged.
The Fenton oxidation tank and the Fenton neutralization tank are respectively provided with a filter and a mud discharging pipe connected with the filter.
The process integrates wastewater treatment and Fenton iron mud resource utilization, and when the embodiment is applied, the reaction in each step pool is fully reacted, so that the reaction efficiency is improved, the reaction time is shortened, the reaction progress can be controlled, the water quality monitoring is facilitated, the treatment effect is ensured, the COD concentration of the wastewater is reduced, and the emission standard of industrial wastewater is reached; in addition, the process realizes the resource utilization of Fenton iron mud, and the new Fenton reagent is prepared, so that the Fenton iron mud can be put into water treatment again, and resources and the Fenton process treatment cost are saved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. The wastewater treatment method based on Fenton iron mud regeneration is characterized by comprising the following steps of:
step 1: mixing Fenton iron mud obtained after Fenton wastewater treatment with clear water to obtain a Fenton iron mud solution, wherein the adding volume of the clear water is the same as the volume of a Fenton medicament ferrous sulfate solution;
step 2: the Fenton iron mud solution enters a Fenton iron mud regeneration reaction tank, an additive is added, the pH value of the Fenton iron mud solution is regulated to be acidic by adding acid, and a regeneration reaction of the Fenton iron mud is carried out to obtain a regenerated iron mud mixed solution, wherein the addition mass of the additive is 0.4-1.0 times of the mass of the Fenton iron mud solution, and the additive is a quinone structure organic matter;
step 3: the regenerated iron mud mixed solution automatically flows to a Fenton oxidation pond, the pH is controlled to be 3-4, hydrogen peroxide is added, and a Fenton catalytic oxidation reaction is carried out, so that a Fenton catalytic oxidation reaction product is obtained;
step 4: flowing the Fenton catalytic oxidation reaction product into a Fenton neutralization tank, adding alkali for neutralization reaction, and adjusting to neutrality, wherein the pH of the effluent reaches the standard to obtain a neutralization reaction product;
step 5: the neutralization reaction product automatically flows to a Fenton sedimentation tank, iron mud in the neutralization reaction product is precipitated to obtain a solid-liquid separation product, and the solid-liquid separation product comprises supernatant and precipitated iron mud, wherein the supernatant is discharged after reaching standards;
step 6: inputting the precipitated iron mud into a Fenton iron mud regeneration reaction tank, continuing to perform the reaction in the step 2-5 until the circulation times of the Fenton iron mud reach saturation, and performing aftertreatment on the Fenton iron mud to obtain an aftertreatment product of the Fenton iron mud;
the wastewater treatment method based on Fenton iron mud regeneration is implemented by a wastewater treatment system, the wastewater treatment system sequentially comprises a mixing tank, a reaction tank, an oxidation tank, a neutralization tank and a sedimentation tank,
the mixing tank is used for mixing Fenton iron mud obtained after Fenton treatment of wastewater with clear water to obtain Fenton iron mud solution;
the reaction tank is used for the regeneration reaction of the Fenton iron mud to obtain regenerated iron mud mixed solution;
the oxidation pond is used for carrying out Fenton catalytic oxidation reaction on the regenerated iron mud mixed solution to obtain a Fenton catalytic oxidation reaction product;
the neutralization pond is used for neutralization reaction of Fenton catalytic oxidation reaction products to obtain neutralization reaction products;
the sedimentation tank is used for solid-liquid separation of the neutralization reaction product to obtain supernatant and precipitated iron mud.
2. The method for treating wastewater based on Fenton iron sludge regeneration according to claim 1, wherein the wastewater treatment system further comprises a stirring mechanism,
the stirring mechanism is arranged in the mixing tank and/or the reaction tank and/or the oxidation tank and/or the neutralization tank and/or the sedimentation tank.
3. The method for treating wastewater based on Fenton iron sludge regeneration according to claim 1, wherein the wastewater treatment system further comprises a first valve and/or a second valve and/or a third valve and/or a fourth valve,
the mixing tank, the reaction tank, the oxidation tank, the neutralization tank and the sedimentation tank are sequentially communicated, wherein,
the liquid outlet of the mixing tank is higher than the liquid inlet of the reaction tank;
the liquid outlet of the reaction tank is higher than the liquid inlet of the oxidation tank;
the liquid outlet of the oxidation tank is higher than the liquid inlet of the neutralization tank;
the liquid outlet of the neutralization tank is higher than the liquid inlet of the sedimentation tank;
the first valve is arranged between the liquid outlet of the mixing tank and the liquid inlet of the reaction tank, the second valve is arranged between the liquid outlet of the reaction tank and the liquid inlet of the oxidation tank, the third valve is arranged between the liquid outlet of the oxidation tank and the liquid inlet of the neutralization tank, and the fourth valve is arranged between the liquid outlet of the neutralization tank and the liquid inlet of the sedimentation tank.
4. The method for wastewater treatment based on Fenton iron sludge regeneration according to claim 1, wherein the wastewater treatment system further comprises a fifth valve,
the sedimentation tank is also communicated with the reaction tank, and the fifth valve is arranged on a pipeline communicated between the sedimentation tank and the reaction tank.
5. The method for treating wastewater based on Fenton iron sludge regeneration according to claim 4, wherein the wastewater treatment system further comprises a spiral feeding mechanism,
the spiral feeding mechanism is arranged in a pipeline communicated between the sedimentation tank and the reaction tank.
6. The method for treating wastewater based on Fenton iron mud regeneration according to claim 1, wherein the Fenton iron mud solution enters a Fenton iron mud regeneration reaction tank, an additive is added, the pH of the Fenton iron mud solution is regulated to be acidic by adding acid, the regeneration reaction of the Fenton iron mud is carried out, the acid is concentrated sulfuric acid in the step of obtaining regenerated iron mud mixed solution, and the pH of the Fenton iron mud solution is regulated to be 2-4 when the pH of the Fenton iron mud solution is regulated to be acidic.
7. The wastewater treatment method based on Fenton iron mud regeneration according to claim 1, wherein the regenerated iron mud mixed solution automatically flows to a Fenton oxidation pond, the pH is controlled to be 3-4, hydrogen peroxide is added, fenton catalytic oxidation reaction is carried out, and in the step of obtaining a Fenton catalytic oxidation reaction product, the pH is controlled by adding acid or alkali.
8. The wastewater treatment method based on Fenton iron mud regeneration according to claim 1, wherein the precipitated iron mud is input into a Fenton iron mud regeneration reaction tank, the reaction is continued in step 2-5 until the Fenton iron mud circulation times reach saturation, and after-treatment is carried out on the Fenton iron mud to obtain a post-treatment product of the Fenton iron mud, wherein the standard that the Fenton iron mud circulation times reach saturation is that the COD value of treated effluent of the sedimentation tank exceeds the wastewater discharge standard.
9. The wastewater treatment method based on Fenton iron mud regeneration according to claim 1, wherein the precipitated iron mud is input into a Fenton iron mud regeneration reaction tank, the reaction is continued in step 2-5 until the Fenton iron mud is saturated in circulation times, and after-treatment is performed on the Fenton iron mud, so that a post-treatment product of the Fenton iron mud is obtained, and the method for performing the post-treatment on the Fenton iron mud comprises the following steps:
the Fenton iron mud enters a filter press to be subjected to filter pressing, so that a mud cake of the Fenton iron mud is obtained;
and drying, solidifying, incinerating or carrying out outward transportation treatment on the mud cake of the Fenton iron mud.
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