CN117486438B - Treatment method of desulfurization wastewater of power plant - Google Patents
Treatment method of desulfurization wastewater of power plant Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 76
- 230000023556 desulfurization Effects 0.000 title claims abstract description 76
- 239000002351 wastewater Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000010881 fly ash Substances 0.000 claims abstract description 61
- 239000002699 waste material Substances 0.000 claims abstract description 50
- 240000000111 Saccharum officinarum Species 0.000 claims abstract description 49
- 235000007201 Saccharum officinarum Nutrition 0.000 claims abstract description 49
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 48
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims abstract description 34
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 34
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 34
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 31
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 31
- 239000000661 sodium alginate Substances 0.000 claims abstract description 31
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000000701 coagulant Substances 0.000 claims abstract description 5
- 239000008394 flocculating agent Substances 0.000 claims abstract description 4
- 239000010802 sludge Substances 0.000 claims abstract description 4
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 17
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 15
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 15
- 239000011265 semifinished product Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 239000012190 activator Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 15
- 239000000126 substance Substances 0.000 abstract description 11
- 230000002378 acidificating effect Effects 0.000 abstract description 3
- 150000003839 salts Chemical class 0.000 abstract description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 16
- 239000000243 solution Substances 0.000 description 16
- 239000000835 fiber Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 241000209140 Triticum Species 0.000 description 6
- 235000021307 Triticum Nutrition 0.000 description 6
- 239000010902 straw Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- -1 fluoride ions Chemical class 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052599 brucite Inorganic materials 0.000 description 3
- 235000010418 carrageenan Nutrition 0.000 description 3
- 239000000679 carrageenan Substances 0.000 description 3
- 229920001525 carrageenan Polymers 0.000 description 3
- 229940113118 carrageenan Drugs 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011592 zinc chloride Substances 0.000 description 2
- 235000005074 zinc chloride Nutrition 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000012134 supernatant fraction Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000005303 weighing Methods 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
-
- 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
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The present application relates to the field of wastewater treatment, and more particularly, to a method for treating desulfurization wastewater from a power plant. A method for treating desulfurization wastewater of a power plant comprises the following steps: step 1): the desulfurization wastewater enters an adjusting tank and stands; step 2): neutralizing the desulfurization wastewater to enable acidic substances in the wastewater to react with alkaline substances to generate harmless salts; step 3): adding a treating agent into the desulfurization wastewater for treatment; step 4): adding a flocculating agent and a coagulant aid into the desulfurization wastewater for treatment; step 5): filtering, separating and concentrating to obtain sludge and discharged water meeting the discharge standard; wherein, the treating agent at least comprises the following raw materials in parts by weight: 80-100 parts of sugarcane waste residue, 25-40 parts of fly ash, 5-15 parts of hydrotalcite and 1-10 parts of sodium alginate. The desulfurization wastewater has good treatment effect, and particularly can obviously and effectively reduce the concentration of chloride ions.
Description
Technical Field
The present application relates to the field of wastewater treatment, and more particularly, to a method for treating desulfurization wastewater from a power plant.
Background
The rapid development of the energy industry in China builds a plurality of large-scale combustionsA coal power plant. These large coal-fired power plants use large amounts of fuel each day, resulting in SO 2 And more is discharged. Therefore, the desulfurization measures are urgent from the green environmental protection concept. Prior Art for SO 2 The control method of (2) comprises the following steps: pre-combustion desulfurization, in-combustion desulfurization, and post-combustion desulfurization. Flue gas desulfurization is currently considered to control SO 2 The most effective way of discharging is achieved. Wet desulfurization is one of the most widely used desulfurization processes in flue gas desulfurization. The desulfurization waste water produced by wet flue gas desulfurization process contains a large quantity of suspended matters such as gypsum particles and SiO 2 Hydroxides of Al and Fe; a fluoride; trace amounts of heavy metals such as As, cd, cr, hg, ni, etc. If the desulfurization wastewater is directly discharged, serious harm is caused to the environment. Especially, the concentration of chloride ions in the desulfurization wastewater is high, so that the problems of equipment corrosion, pipeline hole corrosion, crevice corrosion and the like are caused. And must be remedied.
Disclosure of Invention
In order to treat desulfurization wastewater, particularly to reduce the concentration of chloride ions, the application provides a treatment method of desulfurization wastewater of a power plant.
The method for treating the desulfurization wastewater of the power plant adopts the following technical scheme:
a method for treating desulfurization wastewater of a power plant comprises the following steps:
step 1): the desulfurization wastewater enters an adjusting tank and stands;
step 2): neutralizing the desulfurization wastewater to enable acidic substances in the wastewater to react with alkaline substances to generate harmless salts;
step 3): adding a treating agent into the desulfurization wastewater for treatment;
step 4): adding a flocculating agent and a coagulant aid into the desulfurization wastewater for treatment;
step 5): filtering, separating and concentrating to obtain sludge and discharged water meeting the discharge standard;
wherein, the treating agent at least comprises the following raw materials in parts by weight: 80-100 parts of sugarcane waste residue, 25-40 parts of fly ash, 5-15 parts of hydrotalcite and 1-10 parts of sodium alginate.
By adopting the technical scheme, the steps and devices of a common treatment method are not required to be changed, the desulfurization wastewater is treated by using a specific treatment agent, a new carrier structure is formed by mixing the sugarcane waste residues and the fly ash, and then hydrotalcite and sodium alginate are loaded to form a new treatment agent with a special structure.
Specifically, the treating agent adopts the sugarcane waste residue and the fly ash as carriers, and after the treatment of the roasting procedure, the sugarcane waste residue can still keep the fiber network structure and the toughness of the fibers, so that the fly ash can be embedded into the fiber network structure to form the carriers.
Hydrotalcite is loaded on the surface or inside of the carrier structure, and sodium alginate with negative charges in a solution environment can be quickly and firmly attracted by hydrotalcite with positive charges, so that the structure is more stable. The sugarcane waste residues, the fly ash, the hydrotalcite and the sodium alginate have good complementary actions, so that the actions of all substances are amplified to the greatest extent, and the effect is further improved. The carrier structure is mainly responsible for adsorbing a large amount of suspended matters, a small amount of heavy metals and a small amount of chloride ions in the desulfurization wastewater, the hydrotalcite is mainly responsible for carrying out ion exchange with the chloride ions, the fluoride ions and the like to fix the suspended matters, and the sodium alginate is mainly responsible for absorbing calcium ions and improving the gel forming capacity of the treating agent, so that the treating agent is easier to suspend and uniformly in the desulfurization wastewater, and the desulfurization wastewater is fully and rapidly treated.
The power plant desulfurization wastewater treatment method provided by the application can effectively remove harmful substances in wastewater, especially chlorine ions, so that economic benefit is improved and environmental pollution is reduced.
Preferably, the treating agent at least comprises the following raw materials in parts by mass: 85-95 parts of sugarcane waste residue, 30-35 parts of fly ash, 10-15 parts of hydrotalcite and 3-6 parts of sodium alginate.
By adopting the technical scheme, the dosage of the sugarcane waste residue, the fly ash, the hydrotalcite and the sodium alginate is further limited, the mixing of the sugarcane waste residue and the fly ash is facilitated to form a carrier structure with more loading sites, and the hydrotalcite and the sodium alginate can have a more moderate attraction and coordination relationship, so that the treatment effect of the treating agent in the desulfurization wastewater is further enhanced.
Preferably, the usage amount of the treating agent in the desulfurization wastewater is 10-30g/L.
The specially prepared treating agent has obvious treating effect on various substances in the desulfurization wastewater. Therefore, the dosage of the treating agent is controlled to be only 10-30g/L, so that a better treatment effect can be realized, the dosage of treatment is reduced, and unnecessary waste and pollution risks are reduced.
Preferably, the preparation method of the treating agent comprises the following steps:
step 01): mixing the fly ash with an acid solution, reacting for 60-180min, filtering, mixing and grinding the solid with calcium carbonate and calcium oxide; then adding hydrogen peroxide and stirring to obtain a fly ash mixture for later use;
step 02): soaking sugarcane waste residues in an activator solution, ultrasonically mixing, and standing; obtaining sugarcane waste residue to be treated after solid-liquid separation;
step 03): mixing and stirring the sugarcane waste residue to be treated and the fly ash mixture to obtain a mixture;
step 04): treating the mixture at 850-900 deg.C for 30-120min to obtain semi-finished product;
step 05): mixing the semi-finished product with hydrotalcite and water, and then adding sodium alginate for mixing; drying to obtain the treating agent.
By adopting the technical scheme, the fly ash and the sugarcane waste residue are firstly treated respectively, and then are treated at a specific temperature after being mixed, so that the fly ash and the sugarcane waste residue are integrated into a whole, and a carrier structure with more holes and adsorption sites is formed. Firstly, hydrotalcite is mixed with a carrier structure and adsorbed on the surface of the carrier structure; then the sodium alginate is quickly attracted by hydrotalcite in the solution environment, thereby forming a more stable special new structure.
The specially treated fly ash has better matching effect with the sugarcane waste residue, and can adsorb part of chloride ions, so that the treatment capability of the treating agent on the chloride ions is further improved.
Preferably, in the step 03), the mixture of the sugarcane waste residue to be treated and the fly ash is mixed and stirred for 10-20min under the condition of 1000-1200 r/min.
Through adopting above-mentioned technical scheme, mix sugarcane waste residue, fly ash under specific stirring condition for both have more abundant, even mixed effect, are difficult for loosely, can form the special structure that the structure is more stable, the load site is more even in the follow-up, thereby help improving the treatment effect of treating agent.
Preferably, in the step 05), the water is used in an amount of 1 to 3 times the mass of the semi-finished product.
By adopting the technical scheme, the water consumption is further limited, and a proper reaction system is provided for the sugarcane waste residue, the fly ash, the hydrotalcite and the sodium alginate.
Preferably, the sugarcane waste residue is mixed and soaked with an alkali solution, and the sugarcane waste residue obtained after solid-liquid separation is soaked in an activator solution.
By adopting the technical scheme, the sugarcane waste residue is soaked by the alkali solution in advance, so that redundant impurities can be effectively removed, a part of lignin is removed, and the influence of unnecessary factors on the structure of the semi-finished product is reduced.
Preferably, in the step 01), the mass ratio of the fly ash to the calcium carbonate to the calcium oxide is 1: (0.5-0.8): (0.1-0.15).
By adopting the technical scheme, the dosage of each raw material in the fly ash treatment is further limited, so that the positive charge effect on the surface of the fly ash can be enhanced. The positive charge effect is enhanced, on one hand, the positive charge can react with chloride ions more fully; on the other hand, part of sodium alginate can enter the carrier structure, so that the treating agent can form a gel structure in water, and the desulfurization wastewater can be treated more fully.
In summary, the present application has the following beneficial effects:
1. according to the method, steps and devices of a common treatment method are not required to be changed, the desulfurization wastewater is treated by using the specific treating agent, harmful substances in the wastewater, especially chlorine ions, can be effectively removed, the economic benefit is improved, and the environmental pollution is reduced.
2. The sugarcane waste residue and the fly ash are mixed to form a carrier structure, hydrotalcite and sodium alginate are loaded, a novel treating agent with a special structure is formed, a large amount of suspended matters, a small amount of heavy metals and a small amount of chloride ions in the desulfurization wastewater can be quickly adsorbed, and the chloride ions, the fluoride ions and the like are fixed, so that a uniform and stable treatment effect is achieved.
3. The method has the advantages that after the fly ash is treated, the fly ash is matched with the sugarcane waste residue, so that a good positive charge effect is given to the fly ash after the fly ash is treated, and the gelling capacity of the sodium alginate accelerator can be further improved; can be further combined with chloride ions to improve the treatment effect on desulfurization wastewater.
Detailed Description
The present application is described in further detail below with reference to examples.
The raw materials used in the following examples and comparative examples are all commercially available products.
Specific:
sugarcane waste residue is sold in the market and purchased from Guangxi autumn mountain agricultural development limited company.
Fly ash, commercially available from Changsha Dano building materials Co.
After the hydrotalcite is purchased commercially, the hydrotalcite is further baked for 180min at 450 ℃. Commercially available hydrotalcite is purchased from Anhui stable Jia New Material technology Co., ltd, model HM-2001.
Sodium alginate, commercially available from eastern biosciences inc.
The treating agent comprises sugarcane waste residue, fly ash, hydrotalcite and sodium alginate.
In the treating agent, the sugarcane waste residue can be any value of 80 parts, 82 parts, 85 parts, 87 parts, 90 parts, 93 parts, 95 parts, 97 parts, 100 parts and the like according to the mass parts; the fly ash may be any of 25 parts, 28 parts, 30 parts, 33 parts, 36 parts, 40 parts, etc.; hydrotalcite may be any of 5 parts, 8 parts, 12 parts, 15 parts, etc.; sodium alginate may be any one of 1 part, 3 parts, 5 parts, 7 parts, 10 parts, etc.
The amount of the treating agent used in the desulfurization waste water may be any one of 10g/L, 12g/L, 15g/L, 17g/L, 20g/L, 22g/L, 24g/L, 27g/L, 30g/L, etc.
The preparation method of the treating agent comprises the following steps:
the reaction time of mixing the fly ash and the acid solution in the step 01) can be any value of 60min, 68min, 75min, 83min, 88min, 94min, 100min, 108min, 115min, 122min, 130min, 137min, 145min, 153min, 161min, 168min, 175min, 180min and the like.
The stirring rotation speed of the step 03) can be any value of 1000r/min, 1050r/min, 1100r/min, 1150r/min, 1200r/min and the like; the stirring time may be any one of 10min, 12min, 15min, 18min, 20min, etc.
The temperature in step 04) may be any one of 850 ℃, 860 ℃, 870 ℃, 880 ℃, 890 ℃, 900 ℃, and the like; the treatment time may be any one of 30min, 37min, 45min, 53min, 60min, 68min, 75min, 83min, 88min, 94min, 100min, 108min, 115min, 120min, etc.
Example 1
A method for treating desulfurization wastewater of a power plant comprises the following steps:
step 1): the desulfurization wastewater enters into the regulating tank and stands still.
Step 2): the desulfurization wastewater enters a neutralization box, and sodium hydroxide is added to adjust the pH to 8. The acidic substances in the wastewater react with the alkaline substances to generate harmless salts.
Step 3): the desulfurization wastewater enters a sedimentation tank, a treating agent is added into the sedimentation tank, the dosage of the treating agent is 15g/L, and the treatment time is 45min.
The processing time can be properly adjusted according to the actual situation.
Step 4): the desulfurization wastewater enters a flocculation tank, and a flocculating agent and a coagulant aid are added for treatment. The flocculant is PAC, and the dosage is 15g/L; the coagulant aid is polyacrylamide, and the dosage is 5g/L. The treatment time was 40min.
The processing time can be properly adjusted according to the actual situation.
Step 5): filtering and separating, wherein the solid is mainly sludge. Concentrating the solid, and forming a mud cake after concentrating the solid; and detecting the liquid part, and obtaining the discharged water after the liquid part meets the discharge standard. And if the waste gas does not meet the emission standard, refluxing and processing again.
The treating agent comprises the following raw materials: 900g of sugarcane waste residue, 300g of fly ash, 120g of hydrotalcite and 50g of sodium alginate.
The preparation method of the treating agent comprises the following steps:
step 01): treatment of fly ash:
step 01 a): mixing the fly ash with the acid solution, and reacting for 120min. The acid solution is dilute nitric acid with the concentration of 2mol/L, and the mass ratio of the dilute nitric acid to the fly ash is 1:1.
Step 01 b): solid-liquid separation, drying the solid at 105 ℃. Then mixing the solid with calcium carbonate and calcium oxide in a mortar, and grinding. The mass ratio of the fly ash to the calcium carbonate to the calcium oxide is 1:0.6: the raw materials were weighed in a ratio of 0.12.
Namely 300g of fly ash, 180g of calcium carbonate and 36g of calcium oxide.
Step 01 c): grinding for 15min, adding hydrogen peroxide, and stirring to obtain fly ash mixture for later use. The mass ratio of hydrogen peroxide to solid was 1:2.
Step 02): treatment of sugarcane waste residues:
step 02 a): mixing and soaking the sugarcane waste residues with an alkali solution. Solid-liquid separation and drying at 105 ℃.
The alkaline solution is sodium hydroxide solution with the concentration of 2mol/L, and the mass ratio of the sugarcane waste residue to the alkaline solution is 1:3.
Step 02 b): soaking the sugarcane waste residue after alkali treatment in an activator solution completely, ultrasonically mixing for 10min under the conditions of 200W and 10Hz, and standing. And (3) carrying out solid-liquid separation, and drying at 105 ℃ to obtain the sugarcane waste residue to be treated.
The activator solution is zinc chloride solution with the concentration of 0.5mol/L, and the mass ratio of the sugarcane waste residue to the zinc chloride solution is 1:1.
Step 03): and mixing and stirring the mixture of the sugarcane waste residues to be treated and the fly ash for 20min under the condition of 1000r/min to obtain a mixture.
Step 04): calcining the mixture at 900 ℃ for 60min, and naturally cooling to obtain a semi-finished product.
Step 05): mixing the semi-finished product with hydrotalcite and water, soaking, and standing for 15min. The water consumption is 2 times of the quality of the semi-finished product.
Then adding sodium alginate, mixing, standing and reacting for 30min.
And (3) solid-liquid separation, and drying at 105 ℃ to obtain the treating agent.
Example 2
A method for treating desulfurization wastewater of a power plant is different from example 1 in that the treating agent comprises 850g of sugarcane waste residue, 320g of fly ash, 100g of hydrotalcite and 30g of sodium alginate.
In the step 01 b) of the preparation method of the treating agent, the mass ratio of the fly ash to the calcium carbonate to the calcium oxide is 1:0.8: the raw materials were weighed in a ratio of 0.15.
Namely 320g of fly ash, 256g of calcium carbonate and 48g of calcium oxide.
Example 3
A method for treating desulfurization wastewater of a power plant is different from example 1 in that the treating agent comprises 950g of sugarcane waste residue, 350g of fly ash, 150g of hydrotalcite and 60g of sodium alginate.
In the step 01 b) of the preparation method of the treating agent, the mass ratio of the fly ash to the calcium carbonate to the calcium oxide is 1:0.5: weighing the raw materials according to a ratio of 0.1.
I.e. 350g of fly ash, 175g of calcium carbonate and 35g of calcium oxide.
Example 4
A method for treating desulfurization wastewater of a power plant is different from the method in the embodiment 1 in that in the step 03), the mixture of the sugarcane waste residue to be treated and the fly ash is mixed and stirred for 15min under the condition of 600 r/min.
Example 5
A method for treating desulfurization wastewater from a power plant, which is different from example 1 in that step 02 a) is omitted.
Example 6
The method for treating desulfurization wastewater of a power plant is different from the method in the embodiment 1 in that in the step 01), the mass ratio of fly ash to calcium carbonate to calcium oxide is 1:0.12:0.6, namely 300g of fly ash, 36g of calcium carbonate and 180g of calcium oxide.
Comparative example 1
A method for treating desulfurization wastewater of a power plant is different from that of the embodiment 1 in that in the treating agent, sugarcane waste residues are replaced by wheat straws. Wheat straw is commercially available from the company limited in the new heaven and earth grass industry in zhengyang county.
Comparative example 2
A method for treating desulfurization wastewater of a power plant is different from example 1 in that fly ash is replaced by silica in a treating agent.
Comparative example 3
A method for treating desulfurization wastewater of a power plant is different from example 1 in that hydrotalcite is replaced with brucite in a treating agent.
Comparative example 4
A method for treating desulfurization wastewater of a power plant is different from example 1 in that sodium alginate is replaced by carrageenan in a treating agent.
Comparative example 5
A method for treating desulfurization wastewater from a power plant differs from example 1 in that step 04) is carried out at 450 ℃.
Comparative example 6
A method for treating desulfurization wastewater from a power plant, which is different from example 1 in that step 05) is:
mixing the semi-finished product with sodium alginate and water, soaking, and standing for 30min. The water consumption is 2 times of the quality of the semi-finished product.
Then adding hydrotalcite, mixing, standing and reacting for 15min.
And (3) solid-liquid separation, and drying at 105 ℃ to obtain the treating agent.
Performance test
The desulfurization wastewater from the power plant was treated in the same manner as in examples 1 to 6 and comparative examples 1 to 6.
Referring to DL/T997-2006, first, the supernatant fraction of desulfurization wastewater that was left standing in the conditioning tank of step 1) was examined, and the initial mass concentrations of total cadmium, COD, fluoride and chloride ions were recorded. And then after the treatment in the step 3), taking supernatant, and detecting the mass concentration of the total cadmium, COD, fluoride and chloride ions after the treatment again.
The removal rate was calculated according to the following disclosure and is recorded in table 1.
TABLE 1
As can be seen from comparison of the test results of examples 1 to 6 and comparative examples 1 to 6 in Table 1, the treatment of desulfurization waste water according to the treatment method of the present application shows good effects in removing heavy metals, fluorides, chloride ions, and the like. In addition, the treatment method is simple and easy to operate, low in cost and suitable for popularization and use in the field.
Specifically, comparative example 1 on the basis of example 1, the sugarcane waste residue was changed into wheat straw; comparative example 2 was based on example 1, where fly ash was changed to silica; comparative example 5 was a calcination with the modification of the conditions of example 1. Regarding the differences between comparative examples 1-2, 5 and example 1, the inventors hypothesized that the removal effect on desulfurization waste water was poor because a specific carrier structure could not be generated, and hydrotalcite and sodium alginate could not be firmly supported on the carrier structure.
It is believed that the wheat straw fiber has high brittleness and insufficient toughness, and after roasting, the wheat straw fiber is basically in a powder shape, and a fiber network structure cannot be maintained, so that the fly ash mixture cannot be matched with the wheat straw and embedded into the fiber network structure to form a special load structure, thereby influencing the treatment effect of the treatment agent in the desulfurization wastewater.
Comparative example 3 is based on example 1, the hydrotalcite was replaced with brucite. Although brucite has structural similarity with hydrotalcite, the treatment agent prepared after replacement has poor treatment effect on desulfurization wastewater. The inventor guesses that substances replaced by similar structures cannot have the re-engraving effect because of certain special coordination among the sugarcane waste residues, the fly ash, the hydrotalcite and the sodium alginate.
Comparative example 4 is based on example 1, sodium alginate was replaced by carrageenan. Similarly, although carrageenan has a gelling effect, the effect of blending with a raw material such as hydrotalcite is weak, and the resultant structure is unstable as a whole, so that the treatment effect is poor.
In comparative example 6, on the basis of example 1, the input sequence of hydrotalcite and sodium alginate in the preparation process of the treating agent is changed, and the generation of a special structure is influenced, so that the treating effect is obviously reduced.
In summary, conditions such as raw materials, preparation methods, and the like of the treating agent in the treatment method need to be strictly limited, otherwise, the desulfurization wastewater cannot be treated with an ideal effect.
As can be seen from Table 1, the test data of examples 4-5 are slightly lower than that of example 1, which shows that the further limitation of the mixing conditions of the waste sugar cane and the fly ash and the alkali soaking treatment of the waste sugar cane can make the waste sugar cane and the fly ash fully play a role in the system.
As can be seen from comparison of the detection data of the embodiment 1 and the embodiment 6 in the table 1, the specific mass ratio between the pulverized fuel ash, the calcium carbonate and the calcium oxide is destroyed, so that the positive charge effect on the surface of the pulverized fuel ash is not effectively improved, and the reaction effect with chloride ions and the coordination effect with sodium alginate are both influenced. In order to ensure that the fly ash can fully play the self-action and the matching effect with the rest raw materials of the system, the fly ash needs to be further limited to maintain a specific mass ratio with calcium carbonate and calcium oxide.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (5)
1. The method for treating the desulfurization wastewater of the power plant is characterized by comprising the following steps of:
step 1): the desulfurization wastewater enters an adjusting tank and stands;
step 2): neutralizing desulfurization wastewater;
step 3): adding a treating agent into the desulfurization wastewater for treatment;
step 4): adding a flocculating agent and a coagulant aid into the desulfurization wastewater for treatment;
step 5): filtering, separating and concentrating to obtain sludge and discharged water meeting the discharge standard;
wherein, the treating agent at least comprises the following raw materials in parts by weight: 85-95 parts of sugarcane waste residue, 30-35 parts of fly ash, 10-15 parts of hydrotalcite and 3-6 parts of sodium alginate;
the preparation method of the treating agent comprises the following steps:
step 01): mixing the fly ash with an acid solution, reacting for 60-180min, filtering, mixing and grinding the solid with calcium carbonate and calcium oxide; then adding hydrogen peroxide and stirring to obtain a fly ash mixture for later use;
step 02): mixing and soaking the sugarcane waste residues with an alkali solution, separating solid from liquid, completely immersing the sugarcane waste residues subjected to alkali treatment in an activator solution, ultrasonically mixing, and standing; obtaining sugarcane waste residue to be treated after solid-liquid separation;
step 03): mixing and stirring the sugarcane waste residue to be treated and the fly ash mixture to obtain a mixture;
step 04): calcining the mixture at 850-900 deg.C for 30-120min to obtain semi-finished product;
step 05): mixing the semi-finished product with hydrotalcite and water, and then adding sodium alginate for mixing; drying to obtain the treating agent.
2. The method for treating desulfurization wastewater of a power plant according to claim 1, wherein: the usage amount of the treating agent in the desulfurization wastewater is 10-30g/L.
3. The method for treating desulfurization wastewater of a power plant according to claim 1, wherein: in the step 03), the mixture of the sugarcane waste residue to be treated and the fly ash is mixed and stirred for 10-20min under the condition of 1000-1200 r/min.
4. The method for treating desulfurization wastewater of a power plant according to claim 1, wherein: in the step 05), the water consumption is 1-3 times of the quality of the semi-finished product.
5. The method for treating desulfurization wastewater of a power plant according to claim 1, wherein: in the step 01), the mass ratio of the fly ash to the calcium carbonate to the calcium oxide is 1: (0.5-0.8): (0.1-0.15).
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001347104A (en) * | 2000-06-07 | 2001-12-18 | Yasuhiro Honda | Powdery decontaminant and method of decontaminating clean water and waste water |
| CN105854811A (en) * | 2016-04-05 | 2016-08-17 | 济南大学 | Preparation of sodium alginate intercalated hydrotalcite adsorbent and application thereof |
| WO2017026379A1 (en) * | 2015-08-11 | 2017-02-16 | 堺化学工業株式会社 | Flake-shaped hydrotalcite-type particle and application thereof |
| CN106861654A (en) * | 2017-03-07 | 2017-06-20 | 辽宁工程技术大学 | The immobilization particle and its preparation and application of a kind of same for treating acidic mine wastewater |
| CN108970589A (en) * | 2018-08-02 | 2018-12-11 | 山东省科学院新材料研究所 | A kind of hydrotalcite plural gel ball and its preparation method and application |
| CN110773118A (en) * | 2019-10-23 | 2020-02-11 | 华北电力大学（保定） | Preparation method of modified fly ash-hydrotalcite adsorbent for chloride ions |
| CN110860278A (en) * | 2019-12-24 | 2020-03-06 | 陈志坚 | Adsorbent for underground water and preparation method thereof |
| CN113979607A (en) * | 2021-12-03 | 2022-01-28 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Treatment method of desulfurization wastewater of coal-fired power plant |
| CN116459795A (en) * | 2023-05-24 | 2023-07-21 | 西安航空学院 | Water treatment material for removing lead from wastewater and preparation method and application thereof |
-
2024
- 2024-01-03 CN CN202410004809.5A patent/CN117486438B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001347104A (en) * | 2000-06-07 | 2001-12-18 | Yasuhiro Honda | Powdery decontaminant and method of decontaminating clean water and waste water |
| WO2017026379A1 (en) * | 2015-08-11 | 2017-02-16 | 堺化学工業株式会社 | Flake-shaped hydrotalcite-type particle and application thereof |
| CN105854811A (en) * | 2016-04-05 | 2016-08-17 | 济南大学 | Preparation of sodium alginate intercalated hydrotalcite adsorbent and application thereof |
| CN106861654A (en) * | 2017-03-07 | 2017-06-20 | 辽宁工程技术大学 | The immobilization particle and its preparation and application of a kind of same for treating acidic mine wastewater |
| CN108970589A (en) * | 2018-08-02 | 2018-12-11 | 山东省科学院新材料研究所 | A kind of hydrotalcite plural gel ball and its preparation method and application |
| CN110773118A (en) * | 2019-10-23 | 2020-02-11 | 华北电力大学（保定） | Preparation method of modified fly ash-hydrotalcite adsorbent for chloride ions |
| CN110860278A (en) * | 2019-12-24 | 2020-03-06 | 陈志坚 | Adsorbent for underground water and preparation method thereof |
| CN113979607A (en) * | 2021-12-03 | 2022-01-28 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Treatment method of desulfurization wastewater of coal-fired power plant |
| CN116459795A (en) * | 2023-05-24 | 2023-07-21 | 西安航空学院 | Water treatment material for removing lead from wastewater and preparation method and application thereof |
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