CN114477601B - Method for treating phenol-cyanogen wastewater by using alkali modified fly ash - Google Patents
Method for treating phenol-cyanogen wastewater by using alkali modified fly ash Download PDFInfo
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- 239000010881 fly ash Substances 0.000 title claims abstract description 64
- 239000003513 alkali Substances 0.000 title claims abstract description 51
- 239000002351 wastewater Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000005291 magnetic effect Effects 0.000 claims abstract description 77
- 239000011324 bead Substances 0.000 claims abstract description 72
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 239000000701 coagulant Substances 0.000 claims abstract description 20
- 239000002699 waste material Substances 0.000 claims abstract description 17
- 238000004062 sedimentation Methods 0.000 claims abstract description 16
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000005345 coagulation Methods 0.000 claims description 21
- 230000015271 coagulation Effects 0.000 claims description 21
- 238000001556 precipitation Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 238000007885 magnetic separation Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000009775 high-speed stirring Methods 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010802 sludge Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000004065 wastewater treatment Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000010842 industrial wastewater Substances 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000001112 coagulating effect Effects 0.000 abstract 1
- 239000008213 purified water Substances 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000004939 coking Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229960004887 ferric hydroxide Drugs 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018516 Al—O Inorganic materials 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 230000003746 surface roughness Effects 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/18—Cyanides
-
- 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
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to the technical field of industrial wastewater treatment, in particular to a method for treating phenol-cyanogen wastewater by using alkali modified fly ash. Adding alkali liquor into the phenol-cyanogen wastewater after Fenton reaction treatment for neutralization reaction, adding alkali modified fly ash magnetic beads, coagulant and coagulant aid into the neutralized wastewater for coagulating sedimentation, and carrying out sedimentation separation by an inclined plate sedimentation tank to obtain a purified water source, wherein the fly ash magnetic beads can be recycled by a high-speed hydraulic stirring separation and magnetic recycling device. Compared with the prior art, the invention uses waste to treat waste, reduces the consumption of coagulant and coagulant aid, replaces a high-density sedimentation tank in the original process, and has obvious economic benefit and environmental benefit.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a method for treating phenol-cyanogen wastewater by using alkali modified fly ash.
Background
The fly ash is waste produced by coal-fired power plants, the storage amount is huge, the annual production amount of the fly ash of single-wine steel groups exceeds 100 ten thousand tons, and the resource utilization rate is less than 50%, so that a new fly ash utilization way needs to be researched and developed. The content of iron element in the fly ash magnetic beads of the wine steel group is high (about 5.0-10.0%), the fly ash magnetic beads are ferromagnetic magnetic beads, have high specific gravity and porous properties, and can realize high-value application in the aspect of water treatment. The flyash iron concentrate (also called magnetic beads) with the annual iron production grade of about 56% in the wine steel iron extraction production line is 2.13 ten thousand tons, has the condition of high-value application in the aspect of water treatment, and the magnetic separation technology by utilizing the ferromagnetic magnetic beads has the remarkable advantages of high separation speed, small occupied area and the like, and is widely studied and applied in the field of water treatment in recent years.
The phenol-cyanogen wastewater is mainly formed by condensing and escaping water and gas in the high-temperature carbonization process of coking coal; the second is waste water produced by gas desulfurization, deamination, benzene and naphthalene extraction, and the like, and the further is tar processing waste water. The phenol-cyanogen wastewater post-treatment unit of the wine steel coking plant adopts a Fenton+coagulation reaction+high-density precipitation process, a large amount of polyacrylamide coagulant (PAM) is consumed, a high-density sedimentation tank adopts micro sand as a coagulation core, the micro sand is required to be additionally purchased, the wastewater treatment cost is increased, and the combination capacity of the wastewater treatment unit and the coagulation flocculation is poorer than that of fly ash magnetic beads.
Disclosure of Invention
The invention provides a method for treating phenol-cyanogen wastewater by using alkali modified fly ash, which is used for simplifying the phenol-cyanogen wastewater treatment process, ensuring the effluent quality and achieving the purpose of treating waste by waste.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for treating phenolic cyanide wastewater by using alkali modified fly ash comprises the following steps,
s1: the magnetic bead alkali modification unit is used for mixing and soaking the fly ash magnetic beads with alkali liquor for more than 2 hours, and then filtering and separating to obtain alkali modified fly ash magnetic beads and waste alkali liquor;
s2: the pH adjusting unit is used for mixing the phenol-cyanogen wastewater subjected to Fenton oxidation treatment with the waste alkali liquid obtained in the step S1 for neutralization reaction;
s3: a coagulation reaction unit, which is used for adding a coagulant, a coagulant aid and alkali modified fly ash magnetic beads into the wastewater after the S2 neutralization reaction to carry out coagulation reaction so as to remove flocs and residual organic matters in the wastewater;
s4: a precipitation unit for carrying out precipitation separation on the wastewater after the S3 coagulation reaction in a precipitation tank, discharging the wastewater after precipitation separation into a subsequent process, and treating sludge in S5;
s5: and the magnetic bead recovery unit separates the fly ash magnetic beads in the sludge by utilizing a high-speed stirring separation and magnetic separation device, and returns the fly ash magnetic beads to the S1 for secondary use.
Further, the weight ratio of the effective magnetic beads in the fly ash magnetic beads in the S1 is more than 95%, the median particle diameter is 48-75 mu m, and the saturation magnetization intensity is more than 30 emu/g.
Further, the alkali liquor in the S1 is a sodium hydroxide solution with the concentration of 0.5-1.5 mol/L.
Further, the COD of the phenol-cyanogen wastewater subjected to Fenton oxidation treatment in the step S2 is 102-124 mg/L, and the pH value is 3.5-4.5.
Further, the coagulant in the step S3 is polyaluminum chloride, and the adding amount is 0.8-1.0 g/l; the coagulant aid is polyacrylamide, and the addition amount is 0.1-0.3 g/l; the addition amount of the alkali modified fly ash magnetic beads is 10-15 g/l.
Furthermore, the sedimentation tank in the step S4 adopts an inclined plate sedimentation tank or an auxiliary flow sedimentation tank.
The invention has the beneficial effects that:
1. the addition of the fly ash magnetic beads can form magnetic floccules with the magnetic beads as cores, so that the coagulated floccules have better sedimentation performance, and the high polymer coagulant is favorable for generating good adhesion with the magnetic beads, improving the specific gravity of coagulated particles and accelerating sedimentation; simultaneously, the usage amount of coagulant and coagulant aid can be reduced;
2. the alkali modified fly ash magnetic beads form alkali action points on the surfaces of the magnetic beads due to the modification action of sodium hydroxide on the fly ash magnetic beads, so that the original structures of Si-O and Al-O on the surfaces of the fly ash are changed, the surface roughness and surface property of the fly ash are increased, the adsorption property of the fly ash is enhanced, and meanwhile, in the alkali modification process of sodium hydroxide, a zeolite-like structure is formed in the fly ash, so that the adsorption property of the fly ash is improved. Therefore, the effect of alkali modification of the magnetic beads is mainly to promote the surface of the magnetic beads to effectively combine with particles, so that the precipitation effect is enhanced, the purpose of treating waste with waste can be realized, and good environmental benefit and economic benefit are achieved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following description in conjunction with the accompanying drawings and specific embodiments.
Example 1
The weight ratio of the effective magnetic beads in the produced fly ash magnetic bead sample is 98.48%, and the particle size D50 of the fly ash magnetic bead sample is 48.6 mu m; after magnetic separation and concentration, the element Fe accounts for 73.02 percent; the saturation magnetization of the magnetic bead sample is 38.10 emu/g; the magnetic bead particles of the fly ash mainly comprise mesopores (2-50 nm) and macropores (more than 50 nm).
After biochemical treatment, the coking phenol-cyanogen wastewater is subjected to advanced treatment by adopting a Fenton oxidation method, wherein the COD (chemical oxygen demand) of effluent is 102mg/L, and the pH value is 3.5. The prior art adopts traditional coagulation and high-density precipitation treatment, the prior art improves the effluent treatment process of phenol-cyanogen wastewater after Fenton reaction based on the resource utilization of fly ash magnetic beads, and adopts the technical method of treating the phenol-cyanogen wastewater by adopting alkali modified fly ash magnetic beads, which comprises the following steps:
s1: and the magnetic bead alkali modification unit is used for soaking the fly ash magnetic beads for at least 2 hours by adopting 0.5mol/L sodium hydroxide solution, and then filtering and separating to obtain alkali modified fly ash magnetic beads and waste alkali liquid, wherein the volume of the sodium hydroxide solution is determined according to the required amount of the subsequent pH adjustment unit.
S2: and the pH adjusting unit is used for carrying out neutralization reaction on the phenol-cyanogen wastewater subjected to Fenton oxidation treatment by adopting the waste alkali liquid generated by the magnetic bead alkali modifying unit, the adding amount of the waste alkali liquid is required to meet the requirement of the neutralization reaction, and ferric hydroxide flocs generated by the reaction are removed through subsequent coagulation reaction.
S3: the coagulation reaction unit further removes residual organic matters in the coagulation pond by the wastewater subjected to the neutralization reaction, and adopts a polyaluminium chloride (PAC) high polymer coagulant and Polyacrylamide (PAM) high polymer coagulant and alkali modified fly ash magnetic beads to carry out a mixed reaction, so that the flocs and the residual organic matters are effectively removed, the addition amount of the alkali modified fly ash magnetic beads is 10g/L (10 g of alkali modified fly ash magnetic beads are added into 1 liter of wastewater), the addition amount of PAC is 1.0g/L (1 g of PAC is added into 1 liter of wastewater), and the addition amount of PAM is 0.3g/L (0.1 g/L: 0.1g of PAM added into 1 liter of wastewater).
S4: and the sedimentation unit is used for separating mud from water in the inclined plate sedimentation tank after the coagulation reaction, so that high-density particles generated in the coagulation process are quickly and effectively removed, and purified effluent is obtained. Wherein, the effluent can be further adsorbed by activated carbon, etc., so as to reduce granular impurities and further improve water quality.
S5: and the magnetic bead recovery unit is used for separating the fly ash magnetic beads from the floccule particles through high-speed stirring and separation (the rotating speed is not lower than 1400 r/min), separating and recovering the fly ash magnetic beads through a magnetic separation device (the magnetic field strength is 4000-5000 gauss), and returning the recovered fly ash magnetic beads to the magnetic bead alkali modification unit so as to reduce the addition amount of alkali liquor and initial fly ash magnetic beads.
Example 2
The weight ratio of the effective magnetic beads in the produced fly ash magnetic bead sample is 96 percent; the particle diameter D50 of the fly ash magnetic bead sample is 50 mu m; the saturation magnetization is 49.8 emu/g, and micropores (< 2 nm) are not present in the fly ash magnetic bead particles, and are mainly mesopores (2-50 nm) and macropores (> 50 nm).
After biochemical treatment, the coking phenol-cyanogen wastewater is subjected to advanced treatment by adopting a Fenton oxidation method, wherein the COD (chemical oxygen demand) of effluent is 124mg/L, and the pH value is 4.5. The prior art adopts traditional coagulation and high-density precipitation treatment, the prior art improves the effluent treatment process of phenol-cyanogen wastewater after Fenton reaction based on the resource utilization of fly ash magnetic beads, and adopts the technical method of treating the phenol-cyanogen wastewater by adopting alkali modified fly ash magnetic beads, which comprises the following steps:
s1: and the magnetic bead alkali modification unit is used for soaking the fly ash magnetic beads for at least 2 hours by adopting a sodium hydroxide solution (1.5 mol/L). And then filtering and separating to obtain alkali modified fly ash magnetic beads and waste alkali liquid, wherein the volume of the sodium hydroxide solution is determined according to the required volume of a subsequent pH adjusting unit.
S2: and the pH adjusting unit is used for carrying out neutralization reaction on the phenol-cyanogen wastewater subjected to Fenton oxidation treatment by adopting the waste alkali liquid generated by the magnetic bead alkali modifying unit, the quantity of the waste alkali liquid needs to meet the requirement of the neutralization reaction, and ferric hydroxide flocs generated by the reaction are removed through subsequent coagulation reaction.
S3: the coagulation reaction unit is used for further removing residual organic matters in the coagulation tank by the wastewater subjected to the neutralization reaction, a polyaluminium chloride (PAC) high polymer coagulant is adopted, a Polyacrylamide (PAM) high polymer coagulant aid and alkali modified magnetic beads are mixed for reaction, the floccules and the residual organic matters are effectively removed, the adding amount of the modified magnetic beads is 15g/L, the adding amount of the PAC is 0.8g/L, and the adding amount of the PAM is 0.2g/L.
And S4, a precipitation unit, wherein the sewage after coagulation reaction enters a radial sedimentation tank for mud-water separation, high-density particles generated in the coagulation process are rapidly and effectively removed, and effluent is purified.
S5: the magnetic bead recovery unit is used for separating the fly ash magnetic beads from the floccule particles through a high-speed stirring and separating device (the rotating speed is not lower than 1400 r/min), and recycling the fly ash magnetic beads through the magnetic separating device (the magnetic field strength is 4000-5000 gauss), wherein the recovery rate of the fly ash magnetic beads reaches 90%.
Claims (3)
1. A method for treating phenolic cyanide wastewater by using alkali modified fly ash is characterized by comprising the following steps: comprises the steps of,
s1: the magnetic bead alkali modification unit is used for mixing and soaking the fly ash magnetic beads with alkali liquor for at least 2 hours, and then filtering and separating to obtain alkali modified fly ash magnetic beads and waste alkali liquor; the weight ratio of the effective magnetic beads in the fly ash magnetic beads is more than 95%, the particle size is 48-75 mu m, and the saturation magnetization intensity is more than 30 emu/g;
s2: the pH adjusting unit is used for mixing the phenol-cyanogen wastewater subjected to Fenton oxidation treatment with the waste alkali liquid obtained in the step S1 for neutralization reaction; the COD of the phenol-cyanogen wastewater subjected to Fenton oxidation treatment is 102-124 mg/L, and the pH value is 3.5-4.5;
s3: a coagulation reaction unit, which is used for adding a coagulant, a coagulant aid and alkali modified fly ash magnetic beads into the wastewater after the neutralization reaction in the step S2 to carry out coagulation reaction so as to remove flocs and residual organic matters in the wastewater; the coagulant is polyaluminum chloride, and the addition amount is 0.8-1.0 g/l; the coagulant aid is polyacrylamide, and the addition amount is 0.1-0.3 g/l; the addition amount of the alkali modified fly ash magnetic beads is 10-15 g/l;
s4: a precipitation unit, which is used for carrying out precipitation separation on the wastewater after the S3 coagulation reaction in a precipitation tank, discharging the effluent of the upper layer after precipitation separation, and leading the sludge of the lower layer to enter S5 for treatment;
s5: and the magnetic bead recovery unit separates the fly ash magnetic beads in the sludge by utilizing a high-speed stirring separation and magnetic separation device, and returns the fly ash magnetic beads to the S1 for secondary use.
2. The method for treating phenolic cyanide wastewater by using alkali modified fly ash according to claim 1, which is characterized in that: the alkali liquor in the S1 is sodium hydroxide solution with the concentration of 0.5-1.5 mol/L.
3. The method for treating phenolic cyanide wastewater by using alkali modified fly ash according to claim 1, which is characterized in that: and the sedimentation tank in the step S4 adopts an inclined plate sedimentation tank or a radial sedimentation tank.
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| CN108017137A (en) * | 2017-12-22 | 2018-05-11 | 浙江省环境保护科学设计研究院 | A kind of magnetic Fenton oxidation wastewater treatment method based on magnetic carrier |
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| CN104556523A (en) * | 2013-10-24 | 2015-04-29 | 中国石油化工股份有限公司 | Method for treating alkali residue liquid waste and three-sludge of oil refineries |
| CN104722282A (en) * | 2015-04-08 | 2015-06-24 | 安徽理工大学 | Synthesizing method of fly ash magnetic bead magnetic adsorbent coated by chitosan |
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| CN108017137A (en) * | 2017-12-22 | 2018-05-11 | 浙江省环境保护科学设计研究院 | A kind of magnetic Fenton oxidation wastewater treatment method based on magnetic carrier |
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