CN109879505B - Sodium hypochlorite-containing wastewater treatment process - Google Patents
Sodium hypochlorite-containing wastewater treatment process Download PDFInfo
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a process for treating wastewater containing sodium hypochlorite, which comprises the following steps: discharging sewage containing sodium hypochlorite into a primary sedimentation tank, adding a composite flocculant, and discharging a clarified liquid after primary sedimentation; diluting the clarified liquid in a primary pH adjusting tank, adding a primary pH adjusting agent, stirring and homogenizing, and discharging the wastewater into a primary treatment tank for primary treatment when the pH value of the wastewater is 4-5; conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, discharging the wastewater into a secondary treatment tank, adding a composite reducing agent, and performing secondary sedimentation; and the wastewater after secondary sedimentation enters the catalytic tower from the upper part through a water pump, the wastewater after catalysis is collected and enters the catalytic tower again for circulation and multiple times of catalysis, and finally the pH of the wastewater is adjusted to be neutral and then the wastewater is discharged.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a process for treating wastewater containing sodium hypochlorite.
Background
Sodium hypochlorite is the most common "chlorine" bleaching agent in household washing, and sodium hypochlorite solutions are suitable for disinfection, sterilization and water treatment, and also are only suitable for general industrial products, mainly for bleaching pulp, textiles (such as cloth, towel, undershirt, etc.), chemical fibers and starch. The soap industry is used as a bleaching agent for fats and oils. The chemical industry is used to produce hydrazine hydrate, monochloramine, bischloramine. And is also used for preparing the chlorinating agent of cobalt and nickel. The water treatment agent is used as a water purifying agent, a bactericide and a disinfectant. The dye industry is used to make sulphur sapphire. The organic industry is used for manufacturing the cleaning agent for preparing the acetylene by the hydration of the chloropicrin and the calcium carbide. Agricultural and animal husbandry are used as disinfectants and deodorants for vegetables, fruits, feedlots, animal houses and the like. The food-grade product is used for sterilizing drinking water, fruits and vegetables and sterilizing food manufacturing equipment and appliances.
Chlorine-containing waste gas and chlorine gas which is generated in an accident state and needs to be treated are inevitably generated in a production process by chlor-alkali production enterprises, so the chlor-alkali production enterprises generally adopt a caustic soda absorption method to treat the chlorine-containing waste gas and the accident chlorine gas. Usually, a chlorine gas absorption device is used for directly producing a byproduct sodium hypochlorite, or a semi-finished product is produced and then is introduced into a sodium hypochlorite product through a sodium hypochlorite production device, and the sodium hypochlorite-containing wastewater is inevitably produced in the process.
Because the pollutant composition is comparatively complicated in the waste water that contains sodium hypochlorite, sodium hypochlorite is difficult to handle up to standard completely, and it is expensive to handle the medicament moreover, and danger is high in the operation process, and the treatment effect of present useless sodium hypochlorite waste water is not satisfactory, and a large amount of waste water that contains sodium hypochlorite is directly discharged, the very big destruction that causes the environment.
Chinese patent CN109095677A discloses a comprehensive treatment method for wastewater containing sodium hypochlorite and acidic wastewater containing titanium white produced by a sulfuric acid process. Aiming at the problems of high treatment cost, long treatment time, high equipment requirement and the like when the existing wastewater containing sodium hypochlorite and the acidic wastewater of titanium dioxide prepared by a sulfuric acid method are respectively and independently treated, the invention provides a comprehensive treatment method for the wastewater containing sodium hypochlorite and the acidic wastewater of titanium dioxide prepared by the sulfuric acid method. The method comprises the following steps: adjusting the pH value of the sulfuric acid process titanium dioxide acidic wastewater to 5.5-7.0, adding sodium hypochlorite-containing wastewater, mixing and reacting for 15-20 minutes, and carrying out aeration and filtration to obtain treated water; the weight percentage of the sodium hypochlorite-containing wastewater in the titanium sulfate white wastewater is 0.5-3%. The method reduces the wastewater treatment process and time, saves the treatment cost and has obvious economic benefit.
Disclosure of Invention
The invention aims to provide a process for treating wastewater containing sodium hypochlorite.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, adding a composite flocculant, removing suspended matters in sewage by using the flocculation and precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding a primary pH adjusting agent after diluting the clarified liquid in the primary pH adjusting tank, stirring and homogenizing, discharging the wastewater into a primary treatment tank for primary treatment when the pH value of the wastewater is 4-5, wherein the primary treatment needs to be carried out under sunlight exposure to promote the self-decomposition of sodium hypochlorite in the wastewater, uniformly arranging a plurality of aeration devices at the bottom of the primary treatment tank, blowing air into the wastewater to carry out chlorine generated by decomposition, and conveying the chlorine into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding a secondary pH adjusting agent, stirring and homogenizing, discharging the wastewater into a secondary treatment tank when the pH value of the wastewater is 3-3.2, adding a composite reducing agent, uniformly arranging a plurality of aeration devices in the liquid at the bottom of the secondary treatment tank, fully aerating during secondary treatment, and discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank for secondary sedimentation;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding a sodium hydroxide solution, stirring at room temperature for 5-10h, then carrying out water bath at 50-60 ℃ for 20-25h, carrying out suction filtration, drying the solid, mixing and grinding the solid with attapulgite, and placing the mixture in a muffle furnace to heat to 500-600 ℃ for roasting for 10-15 h.
Further, the composite flocculant is polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 5-10: 5-10: 1 are mixed.
Further, the time of primary sedimentation is 5-10 d.
Further, the first-stage pH regulator is hydrochloric acid with the mass fraction of 10-20%.
Further, the time of one treatment is 2-5 d.
Further, the secondary pH regulator is hydrochloric acid with the mass fraction of 1-3%.
Further, the composite reducing agent is formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1: 1.
Further, the secondary settling time is 1-3 d.
The working principle and the advantages of the invention are as follows:
the invention provides a sodium hypochlorite-containing wastewater treatment process, wherein a composite flocculant can provide a large amount of complex ions and can strongly adsorb colloidal particles, solid suspended matter impurities are condensed through adsorption, bridging and crosslinking effects, polyacrylamide can neutralize charges on the surfaces of suspended matters and reduce electric potential, so suspended matter impurities are removed through precipitation, aeration treatment is simultaneously carried out during next treatment under sunlight exposure, chlorine generated by decomposition is taken out by blowing air into wastewater, the air is continuously contacted with the wastewater, the self-decomposition rate of sodium hypochlorite in the wastewater can be improved at high temperature, an attapulgite-loaded Ni2O3 catalyst has a proper specific surface area, the interaction between Ni-O-Cl can be formed, the conversion between different valence states of Ni element is accelerated, and the oxidation capacity of an active site of the catalyst is improved, the invention further accelerates the decomposition reaction speed of sodium hypochlorite, improves the thorough degree of sodium hypochlorite decomposition, realizes the purification of the wastewater containing sodium hypochlorite, and the treated wastewater completely reaches the standard and can be discharged.
Drawings
FIG. 1 is a flow chart of the treatment process of wastewater containing sodium hypochlorite according to the present invention.
Detailed Description
Example 1:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 10: 5: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 10 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding 15% hydrochloric acid for pH adjustment and stirring homogenization treatment after the clarified liquid is subjected to concentration dilution in the primary pH adjusting tank, discharging the wastewater into a primary treatment tank for primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 5d, the primary treatment needs to be performed under sunlight exposure to promote self-decomposition of sodium hypochlorite in the wastewater, a plurality of aeration devices are uniformly arranged at the bottom of the primary treatment tank, air is blown into the wastewater to carry chlorine generated by decomposition out, and the chlorine is conveyed into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding 1% hydrochloric acid by mass percentage to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 2 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding sodium hydroxide solution, stirring at room temperature for 5h, water-bathing at 55 ℃ for 20h, filtering, drying the solid, mixing with attapulgite, grinding, and roasting the mixture in a muffle furnace at 500 ℃ for 12 h.
Example 2:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 5: 5: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 5 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding hydrochloric acid with the mass fraction of 12% after diluting the clarified liquid in the primary pH adjusting tank to adjust the pH value, stirring and homogenizing, discharging the wastewater into a primary treatment tank to perform primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 2d, the primary treatment needs to be performed under sunlight exposure to promote the self-decomposition of sodium hypochlorite in the wastewater, uniformly arranging a plurality of aeration devices at the bottom of the primary treatment tank, blowing air into the wastewater to take chlorine generated by decomposition out, and conveying the chlorine into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding hydrochloric acid with the mass fraction of 3% to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 3 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding sodium hydroxide solution, stirring at room temperature for 10h, water-bathing at 55 ℃ for 20h, performing suction filtration, drying the solid, mixing with attapulgite, grinding, and roasting the mixture in a muffle furnace for 12h after heating to 500 ℃.
Example 3:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 5: 5: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 5 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding hydrochloric acid with the mass fraction of 10% after diluting the clarified liquid in the primary pH adjusting tank to adjust the pH value, stirring and homogenizing, discharging the wastewater into a primary treatment tank to perform primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 2d, the primary treatment needs to be performed under sunlight exposure to promote the self-decomposition of sodium hypochlorite in the wastewater, uniformly arranging a plurality of aeration devices at the bottom of the primary treatment tank, blowing air into the wastewater to take chlorine generated by decomposition out, and conveying the chlorine into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding 1% hydrochloric acid by mass percentage to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 1 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding sodium hydroxide solution, stirring at room temperature for 5h, water-bathing at 50 ℃ for 20h, filtering, drying the solid, mixing with attapulgite, grinding, and roasting the mixture in a muffle furnace at 500 ℃ for 10 h.
Example 4:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 10: 10: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 10 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding 20% hydrochloric acid for pH adjustment and stirring homogenization treatment after the clarified liquid is subjected to concentration dilution in the primary pH adjusting tank, discharging the wastewater into a primary treatment tank for primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 5d, the primary treatment needs to be performed under sunlight exposure to promote self-decomposition of sodium hypochlorite in the wastewater, a plurality of aeration devices are uniformly arranged at the bottom of the primary treatment tank, air is blown into the wastewater to carry chlorine generated by decomposition out, and the chlorine is conveyed into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding hydrochloric acid with the mass fraction of 3% to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 3 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, adding sodium hydroxide solution dropwise, stirring at room temperature for 10 hr, water bath at 60 deg.C for 25 hr, vacuum filtering, and solidifyingAnd (3) mixing and grinding the dried body and attapulgite, and roasting the mixture for 15 hours in a muffle furnace after heating to 600 ℃.
Example 5:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 5: 8: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 10 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding hydrochloric acid with the mass fraction of 10% after diluting the clarified liquid in the primary pH adjusting tank to adjust the pH value, stirring and homogenizing, discharging the wastewater into a primary treatment tank to perform primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 4d, the primary treatment needs to be performed under sunlight exposure to promote the self-decomposition of sodium hypochlorite in the wastewater, uniformly arranging a plurality of aeration devices at the bottom of the primary treatment tank, blowing air into the wastewater to take chlorine generated by decomposition out, and conveying the chlorine into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding 1% hydrochloric acid by mass percentage to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 3 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding sodium hydroxide solution, stirring at room temperature for 5h, carrying out water bath at 50 ℃ for 25h, carrying out suction filtration, drying the solid, mixing with attapulgite, grinding, and roasting the mixture in a muffle furnace at 600 ℃ for 12 h.
Example 6:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 5: 10: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 5 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding hydrochloric acid with the mass fraction of 10% after diluting the clarified liquid in the primary pH adjusting tank to adjust the pH value, stirring and homogenizing, discharging the wastewater into a primary treatment tank to perform primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 4d, the primary treatment needs to be performed under sunlight exposure to promote the self-decomposition of sodium hypochlorite in the wastewater, uniformly arranging a plurality of aeration devices at the bottom of the primary treatment tank, blowing air into the wastewater to take chlorine generated by decomposition out, and conveying the chlorine into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding 1% hydrochloric acid by mass percentage to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 3 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding sodium hydroxide solution, stirring at room temperature for 5h, water-bathing at 55 ℃ for 20h, filtering, drying the solid, mixing with attapulgite, grinding, and roasting the mixture in a muffle furnace at 600 ℃ for 12 h.
Example 7:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 5: 10: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 5 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding 20% hydrochloric acid for pH adjustment and stirring homogenization treatment after the clarified liquid is subjected to concentration dilution in the primary pH adjusting tank, discharging the wastewater into a primary treatment tank for primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 2d, the primary treatment needs to be performed under sunlight exposure to promote self-decomposition of sodium hypochlorite in the wastewater, a plurality of aeration devices are uniformly arranged at the bottom of the primary treatment tank, air is blown into the wastewater to carry chlorine generated by decomposition out, and the chlorine is conveyed into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding hydrochloric acid with the mass fraction of 3% to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 1 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding a sodium hydroxide solution, stirring at room temperature for 10h, carrying out water bath at 50 ℃ for 25h, carrying out suction filtration, drying the solid, mixing with attapulgite, grinding, and roasting the mixture in a muffle furnace for 15h after heating to 500 ℃.
Example 8:
a process for treating wastewater containing sodium hypochlorite specifically comprises the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, and adding polyaluminium chloride, polyacrylamide and ferric trichloride according to a mass ratio of 10: 5: 1, removing suspended matters in sewage by using the flocculation precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation for 10 days;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding hydrochloric acid with the mass fraction of 10% after diluting the clarified liquid in the primary pH adjusting tank to adjust the pH value, stirring and homogenizing, discharging the wastewater into a primary treatment tank to perform primary treatment when the pH value of the wastewater reaches 4-5, wherein the primary treatment time is 5 days, the primary treatment needs to be performed under sunlight exposure to promote the self-decomposition of sodium hypochlorite in the wastewater, uniformly arranging a plurality of aeration devices at the bottom of the primary treatment tank, blowing air into the wastewater to take chlorine generated by decomposition out, and conveying the chlorine into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding 1% hydrochloric acid by mass percentage to adjust the pH, stirring and homogenizing, discharging the wastewater into the secondary treatment tank when the pH value of the wastewater reaches 3-3.2, adding a composite reducing agent formed by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to the mass ratio of 1:1:1, uniformly arranging a plurality of aeration devices in the bottom liquid of the secondary treatment tank, fully aerating during secondary treatment, discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank, and performing secondary sedimentation for 3 d;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding sodium hydroxide solution, stirring at room temperature for 5h, water-bathing at 60 ℃ for 20h, filtering, drying the solid, mixing with attapulgite, grinding, and roasting the mixture in a muffle furnace at 600 ℃ for 10 h.
Claims (8)
1. A process for treating wastewater containing sodium hypochlorite is characterized by comprising the following steps:
(1) discharging sewage containing sodium hypochlorite into a primary sedimentation tank, adding a composite flocculant, removing suspended matters in sewage by using the flocculation and precipitation effect of the composite flocculant, and discharging clarified liquid after primary sedimentation;
(2) discharging the clarified liquid into a primary pH adjusting tank, adding a primary pH adjusting agent after diluting the clarified liquid in the primary pH adjusting tank, stirring and homogenizing, discharging the wastewater into a primary treatment tank for primary treatment when the pH value of the wastewater is 4-5, wherein the primary treatment needs to be carried out under sunlight exposure to promote the self-decomposition of sodium hypochlorite in the wastewater, uniformly arranging a plurality of aeration devices at the bottom of the primary treatment tank, blowing air into the wastewater to carry out chlorine generated by decomposition, and conveying the chlorine into a chlorine treatment device through an air exhaust pipeline;
(3) conveying the wastewater subjected to primary treatment to a secondary pH adjusting tank, adding a secondary pH adjusting agent, stirring and homogenizing, discharging the wastewater into a secondary treatment tank when the pH value of the wastewater is 3-3.2, adding a composite reducing agent, uniformly arranging a plurality of aeration devices at the bottom of the secondary treatment tank, fully aerating during secondary treatment, and discharging the wastewater subjected to secondary treatment into a secondary sedimentation tank for secondary sedimentation;
(4) the wastewater after secondary sedimentation enters a catalytic tower from the upper part through a water pump, is atomized by an atomizer and then fully contacts and reacts with a catalyst in the catalytic tower, the catalyzed wastewater is collected and enters the catalytic tower again for circulation and multiple times of catalysis until no sodium hypochlorite exists in the wastewater after detection, and finally the wastewater is discharged after the pH value is adjusted to be neutral;
the catalyst is attapulgite loaded with Ni2O3The preparation method comprises the following steps: dissolving nickel nitrate in distilled water, dropwise adding a sodium hydroxide solution, stirring at room temperature for 5-10h, then carrying out water bath at 50-60 ℃ for 20-25h, carrying out suction filtration, drying the solid, mixing and grinding the solid with attapulgite, and placing the mixture in a muffle furnace to heat to 500-600 ℃ for roasting for 10-15 h.
2. The process for treating wastewater containing sodium hypochlorite according to claim 1, wherein the composite flocculant is polyaluminium chloride, polyacrylamide and ferric chloride, and the mass ratio of the polyaluminium chloride to the polyacrylamide is 5-10: 5-10: 1 are mixed.
3. The process for treating sodium hypochlorite-containing wastewater as claimed in claim 1, wherein the time for primary sedimentation is 5 to 10 days.
4. The process for treating wastewater containing sodium hypochlorite according to claim 1, wherein the primary pH regulator is hydrochloric acid with a mass fraction of 10-20%.
5. The process for treating sodium hypochlorite-containing wastewater as set forth in claim 1, wherein the time for one treatment is 2 to 5 days.
6. The process for treating wastewater containing sodium hypochlorite according to claim 1, wherein the secondary pH regulator is hydrochloric acid with a mass fraction of 1-3%.
7. The process for treating wastewater containing sodium hypochlorite according to claim 1, wherein the composite reducing agent is prepared by mixing ferrous sulfate, sodium sulfite and sodium thiosulfate according to a mass ratio of 1:1: 1.
8. The process for treating wastewater containing sodium hypochlorite according to claim 1, wherein the secondary sedimentation time is 1 to 3 days.
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