CN111233253A - Enhanced phosphorus removal process for phosphorus-containing wastewater - Google Patents
Enhanced phosphorus removal process for phosphorus-containing wastewater Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- 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
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- 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
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2001/007—Processes including a sedimentation step
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- C02F2101/00—Nature of the contaminant
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- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
Abstract
The invention relates to an enhanced phosphorus removal process for phosphorus-containing wastewater, which comprises the following process steps: step 1, putting phosphorus-containing wastewater into a regulating tank, and then sequentially entering an anaerobic tank and an aerobic tank; step 2, the phosphorus-containing wastewater after biological phosphorus removal enters a phosphorus removal reaction tank, ferrous salt is added into the phosphorus removal reaction tank, and sludge water separation is carried out after reaction; step 3, enabling the separated supernatant to flow into a coagulation tank, introducing air, stirring, adjusting the pH value of the solution to 7.0-7.5, and adding a coagulant aid; step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding a flocculating agent into the flocculation tank for flocculation reaction; and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging sludge at the lower layer into a sludge tank through a sludge discharge pump, dehydrating the sludge, and transporting the obtained sludge cake outside. The invention has stable dephosphorization and low operation cost and can reach the discharge standard specified in China.
Description
Technical Field
The invention relates to the technical field of phosphorus-containing wastewater treatment, in particular to a reinforced phosphorus removal process for phosphorus-containing wastewater.
Background
The phosphorus-containing wastewater is mainly derived from the production processes of various detergents, industrial raw materials and agricultural wastes, phosphorus is a source for causing eutrophication of water bodies, and if the phosphorus is directly discharged without treatment, the water environment is seriously polluted. Although phosphorus is an essential nutrient substance for organisms and has no toxicity, when a large amount of phosphorus substances and other nutrient substances are discharged into water together, a large amount of algae substances in the water body can be propagated, so that the oxygen content of the water body is rapidly reduced, the survival of aquatic organisms such as fishes is influenced, the ecological balance of the water body is disordered, and the eutrophication of the water body is formed. The current phenomena of blue algae, red tide and the like are caused by the phenomena of excessive phosphorus and the like.
The forms of phosphorus in water are classified into two major types, organic phosphorus and inorganic phosphorus, and inorganic phosphorus exists in water in various forms, such as orthophosphate, hypophosphite, pyrophosphate, metaphosphate and polyphosphate. The treatment process commonly adopted by the phosphorus-containing sewage at present comprises a chemical precipitation method, a physical adsorption method and a biological method, wherein the chemical precipitation method is mainly characterized in that a chemical phosphorus removal medicament is added into the sewage to enable phosphorus in the sewage to chemically react with the phosphorus removal medicament to generate insoluble phosphate precipitate, then the phosphate precipitate is removed from the sewage in a solid-liquid separation mode, and meanwhile, the formed flocculating constituent also has an adsorption removal effect on the phosphorus. The common phosphorus removal agents adopted for chemical phosphorus removal comprise iron salt, aluminum salt, calcium salt, polymeric flocculant and the like. The physical adsorption method is usually carried out by using activated carbon, resin and the like for adsorption so as to achieve the effect of reducing the content of phosphorus in water. The biological phosphorus removal mainly utilizes the characteristics of anaerobic phosphorus release and aerobic phosphorus absorption of phosphorus-accumulating bacteria to remove phosphorus from sewage. China currently executes a primary standard specified in a comprehensive sewage discharge standard GB8978-96 for sewage treatment, namely the allowable discharge concentration of total phosphorus is 0.5 mg/L.
Chinese patent with the publication number of CN102173518B discloses a phosphorus removal treatment method for glyphosate wastewater, which comprises the process steps of alkaline hydrolysis, precipitation reaction, Fenton oxidation reaction, bleaching powder catalytic oxidation precipitation and the like, wherein the bleaching powder adopts calcium salt.
The above prior art solutions have the following drawbacks: the catalytic oxidation phosphorus removal equipment has the defects of large investment, high operation cost, large dosage, high operation cost and large sludge production amount in calcification phosphorus removal, so that an enhanced treatment process for phosphorus-containing wastewater is needed, the phosphorus removal is stable, the operation cost is low, and the emission standard specified in China can be met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the enhanced phosphorus removal process for the phosphorus-containing wastewater, which has the effects of stable phosphorus removal and low operation cost and can reach the discharge standard specified in China.
The above object of the present invention is achieved by the following technical solutions: an enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 60-120 min in the anaerobic tank and staying for 120-180 min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous salt into the phosphorus removal reaction tank, and quickly reacting for 1-3 min, wherein the adding amount of the ferrous salt is 300-400 ppm, the phosphorus-containing wastewater flows into a primary sedimentation tank for mud-water separation after reaction, and sludge at the bottom of the primary sedimentation tank is discharged into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adjusting the pH of the solution to 7.0-7.5, adding a coagulant aid for charge neutralization, wherein the adding amount of the coagulant aid is 50-100 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding a flocculating agent into the flocculation tank for flocculation reaction, wherein the adding amount of the flocculating agent is 1-3 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
By adopting the technical scheme, the phosphorus-containing wastewater firstly enters the regulating tank, the regulating tank can reduce water fluctuation, has a certain buffering effect, can stabilize water quality and prevent the sudden change of the load of a subsequent biological treatment system. The phosphorus-containing wastewater passing through the regulating reservoir enters an anaerobic pool, and the phosphorus-accumulating bacteria absorb easily biodegradable organic matters such as ethanol, methanol, acetic acid, propionic acid and the like in the phosphorus-containing wastewater and store the organic matters in cells as nutrient sources, and release the existing polymerized phosphate in the cells into water; in an aerobic tank, in an aerobic state, phosphorus-accumulating bacteria oxidize and decompose organic substances in cells to generate energy, phosphate in wastewater can be absorbed in the cells and stored in the cells in the form of polyphosphate, the phosphorus is finally discharged in the form of sludge, and the phosphorus content in part of wastewater can be reduced through the phosphorus-containing wastewater subjected to biological treatment. The wastewater after biological phosphorus removal enters a phosphorus removal reaction tank, ferrous salt is added, and ferrous ions and phosphate in the wastewater generate ferrous phosphate precipitate which is easy to precipitate, and particularly the ferrous phosphate precipitate can react with organic phosphorus which is difficult to remove, so that the high-efficiency removal of total phosphorus is ensured. The supernatant separated by the primary sedimentation tank contains ferrous ions which are not easy to remove, so that air is introduced into the coagulation tank to enable the ferrous ions to be oxidized into ferric ions more easily, the pH value of the solution is adjusted to 7.0-7.5 to enable the ferric ions to generate ferric hydroxide sediment, and a coagulant aid is added to neutralize the charges, so that the treatment effect of the residual ferric ions and the total phosphorus is further improved. And (2) continuously adding a flocculating agent, enabling small particles in the wastewater to generate flocculating constituents with larger particles under the action of a net catching mode by the flocculating agent, facilitating quick sedimentation, after flocculation is finished, performing mud-water separation through an inclined tube sedimentation tank, discharging supernatant liquid to reach the standard, discharging the sludge into a sludge tank through a sludge discharge pump, dehydrating the sludge through a sludge press after concentration, and transporting sludge cakes outside.
The present invention in a preferred example may be further configured to: the ferrous salt in the step 2 at least comprises one of ferrous sulfate, ferrous chloride and ferrous carbonate.
By adopting the technical scheme, the phosphate in the phosphorus-containing wastewater reacts with ferrous ions to form ferrous phosphate precipitate which is easy to precipitate.
The present invention in a preferred example may be further configured to: the coagulant aid in the step 3 at least comprises one of polyaluminium chloride, polyaluminium sulfate, polyferric chloride and polyferric sulfate.
By adopting the technical scheme, the polyaluminium chloride, the polyaluminium sulfate, the polyferric chloride and the polyferric sulfate are added into the phosphorus-containing wastewater, the coagulation effect can be improved, and the cost of wastewater treatment can be saved due to low price.
The present invention in a preferred example may be further configured to: the pH of the solution is adjusted by calcium hydroxide in step 3.
By adopting the technical scheme, compared with other alkalis, the calcium hydroxide has low solubility in water, can be slowly adjusted when being used for adjusting the pH value of the solution, and is easy to control.
The present invention in a preferred example may be further configured to: and the flocculating agent in the step 4 at least comprises one of polyacrylamide and sodium polyacrylate.
By adopting the technical scheme, the polyacrylamide is a long chain molecular structure, the long chain of the polyacrylamide can be bent or curled into an irregular curve shape, a plurality of chemically active groups such as amide groups and carboxyl groups can extend outwards from the long molecular chain, the amide groups are nonionic groups, and the amide groups are easy to form secondary valence bonds and are adsorbed and connected with active groups of other substances. Because polyacrylamide molecules are long and fine and have many chemically active groups, they can form large flocs by making many bonds with the precipitated particles. The sodium polyacrylate can form ionic bonds with positively charged suspended particles due to the neutralization characteristic of surface charges, so that the suspended particles are condensed; in addition, the sodium polyacrylate also has an active adsorption function, and can adsorb suspended particles on the surface of the sodium polyacrylate so that the suspended particles are mutually aggregated to form a large floccule body and promote sedimentation.
The present invention in a preferred example may be further configured to: and the flocculation reaction time in the step 4 is 90-120 min.
Through adopting above-mentioned technical scheme, flocculation reaction is the flocculating constituent gradual increase slow-speed process, need guarantee certain flocculation time, makes the flocculating constituent increase to enough big particle size, and the rethread deposits and gets rid of. The flocculation time is less than 90min, the particle size of a flocculating body is small, and the flocculating body is not easy to precipitate, so that the dephosphorization effect is not good; the flocculation time is longer than 120min, the flocculation time is prolonged, the particle size of the floccule is increased slowly, the sedimentation speed is not increased too much, and the phosphorus removal efficiency is low.
The present invention in a preferred example may be further configured to: the adding proportion of the coagulant aid to the flocculant is 37.5: 1.
by adopting the technical scheme, the coagulant aid and the flocculating agent have the best phosphorus removal effect in the phosphorus-containing wastewater at the ratio.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the phosphorus-containing wastewater enters the regulating tank firstly, the regulating tank can reduce water fluctuation, has a certain buffering effect, can stabilize water quality, and prevents the load of a subsequent biological treatment system from changing rapidly. The phosphorus-containing wastewater passing through the regulating reservoir enters an anaerobic pool, and the phosphorus-accumulating bacteria absorb easily biodegradable organic matters such as ethanol, methanol, acetic acid, propionic acid and the like in the phosphorus-containing wastewater and store the organic matters in cells as nutrient sources, and release the existing polymerized phosphate in the cells into water; in an aerobic tank, in an aerobic state, phosphorus-accumulating bacteria oxidize and decompose organic substances in cells to generate energy, phosphate in wastewater can be absorbed in the cells and stored in the cells in the form of polyphosphate, the phosphorus is finally discharged in the form of sludge, and the phosphorus content in part of wastewater can be reduced through the phosphorus-containing wastewater subjected to biological treatment. The wastewater after biological phosphorus removal enters a phosphorus removal reaction tank, ferrous salt is added, and ferrous ions and phosphate in the wastewater generate ferrous phosphate precipitate which is easy to precipitate, and particularly the ferrous phosphate precipitate can react with organic phosphorus which is difficult to remove, so that the high-efficiency removal of total phosphorus is ensured;
2. the supernatant separated by the primary sedimentation tank contains ferrous ions which are not easy to remove, so that air is introduced into the coagulation tank to enable the ferrous ions to be oxidized into ferric ions more easily, the pH value of the solution is adjusted to 7.0-7.5 to enable the ferric ions to generate ferric hydroxide sediment, and a coagulant aid is added to neutralize the charges, so that the treatment effect of the residual ferric ions and the total phosphorus is further improved. Continuously adding a flocculating agent, wherein the flocculating agent enables small particles in the wastewater to generate flocculating constituents with larger particles under the action of a net catching mode, so that the flocculating constituents are favorable for rapid sedimentation, after flocculation is finished, performing sludge-water separation through an inclined tube sedimentation tank, discharging supernatant liquid which reaches the standard, discharging sludge into a sludge tank through a sludge discharge pump, dehydrating the sludge through a sludge press after concentration, and transporting sludge cakes;
3. polyacrylamide is a long chain molecular structure, the long chain of which can be bent or curled into an irregular curve shape, and the long molecular chain can extend outwards to form a plurality of chemically active groups, such as amide groups and carboxyl groups, wherein the amide groups are nonionic groups and can easily form secondary valence bonds to be adsorbed and connected with active groups of other substances. Because polyacrylamide molecules are long and fine and have many chemically active groups, they can form large flocs by making many bonds with the precipitated particles. The sodium polyacrylate can form ionic bonds with positively charged suspended particles due to the neutralization characteristic of surface charges, so that the suspended particles are condensed; in addition, the sodium polyacrylate also has an active adsorption function, and can adsorb suspended particles on the surface of the sodium polyacrylate so that the suspended particles are mutually aggregated to form a large floccule body and promote sedimentation.
Drawings
FIG. 1 is a schematic view of a process flow for enhanced phosphorus removal of phosphorus-containing wastewater according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
An enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 60min in the anaerobic tank and 120min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous sulfate into the phosphorus removal reaction tank, and quickly reacting for 1min, wherein the adding amount of the ferrous sulfate is 300ppm, the phosphorus-containing wastewater after reaction flows into a primary sedimentation tank for mud-water separation, and sludge at the bottom of the primary sedimentation tank is discharged into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adding calcium hydroxide to adjust the pH value of the solution to 7.0, adding polyferric chloride to neutralize charges, wherein the adding amount of the polyferric chloride is 50 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding polyacrylamide into the flocculation tank for flocculation reaction, wherein the adding amount of the polyacrylamide is 1 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
Example 2
An enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 90min in the anaerobic tank and 180min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous chloride and ferrous sulfate into the phosphorus removal reaction tank for rapid reaction for 2min, wherein the adding amount of the ferrous chloride is 150ppm, the adding amount of the ferrous sulfate is 250ppm, the phosphorus-containing wastewater after reaction flows into a primary sedimentation tank for mud-water separation, and sludge at the bottom of the primary sedimentation tank is discharged into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adding calcium hydroxide to adjust the pH value of the solution to 7.2, adding polymeric ferric chloride and polymeric ferric sulfate to neutralize the charge, wherein the adding amount of the polymeric ferric chloride is 40ppm, and the adding amount of the polymeric ferric sulfate is 35 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding sodium polyacrylate into the flocculation tank for flocculation reaction, wherein the adding amount of the sodium polyacrylate is 2 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
Example 3
An enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 120min in the anaerobic tank and 150min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous carbonate into the phosphorus removal reaction tank for rapid reaction for 3min, wherein the adding amount of the ferrous carbonate is 400ppm, feeding the phosphorus-containing wastewater subjected to reaction into a primary sedimentation tank for mud-water separation, and discharging sludge at the bottom of the primary sedimentation tank into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adding calcium hydroxide to adjust the pH value of the solution to 7.5, adding polyaluminium sulfate to neutralize charges, wherein the adding amount of the polyaluminium sulfate is 100 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding polyacrylamide and sodium polyacrylate into the flocculation tank for flocculation reaction, wherein the adding amount of the polyacrylamide is 2ppm, and the adding amount of the sodium polyacrylate is 1 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
Example 4
An enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 120min in the anaerobic tank and staying for 120min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous sulfate and ferrous carbonate into the phosphorus removal reaction tank for rapid reaction for 2min, wherein the adding amount of the ferrous sulfate is 250ppm, the adding amount of the ferrous carbonate is 100ppm, the phosphorus-containing wastewater after reaction flows into a primary sedimentation tank for mud-water separation, and sludge at the bottom of the primary sedimentation tank is discharged into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adding calcium hydroxide to adjust the pH value of the solution to 7.3, adding polymeric ferric sulfate to neutralize the charge, wherein the adding amount of the polymeric ferric sulfate is 50 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding sodium polyacrylate into the flocculation tank for flocculation reaction, wherein the adding amount of the sodium polyacrylate is 1 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
Example 5
An enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 90min in the anaerobic tank and 150min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous sulfate into the phosphorus removal reaction tank, and quickly reacting for 1.5min, wherein the adding amount of the ferrous sulfate is 300ppm, the phosphorus-containing wastewater after reaction flows into a primary sedimentation tank for mud-water separation, and sludge at the bottom of the primary sedimentation tank is discharged into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adding calcium hydroxide to adjust the pH value of the solution to 7.4, adding polymeric ferric chloride and polymeric ferric sulfate to neutralize charges, wherein the adding amount of the polymeric ferric chloride is 35ppm, and the adding amount of the polymeric ferric sulfate is 30 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding polyacrylamide into the flocculation tank for flocculation reaction, wherein the adding amount of the polyacrylamide is 2 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
Example 6
An enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 100min in the anaerobic tank and 160min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous sulfate and ferric chloride into the phosphorus removal reaction tank for rapid reaction for 3min, wherein the adding amount of the ferrous sulfate is 190ppm, the adding amount of the ferrous chloride is 150ppm, the phosphorus-containing wastewater after reaction flows into a primary sedimentation tank for mud-water separation, and sludge at the bottom of the primary sedimentation tank is discharged into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adding calcium hydroxide to adjust the pH value of the solution to 7.5, and adding polyaluminium chloride for charge neutralization, wherein the adding amount of the polyaluminium chloride is 90 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding polyacrylamide into the flocculation tank for flocculation reaction, wherein the adding amount of the polyacrylamide is 2 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
Example 7
An enhanced phosphorus removal process for phosphorus-containing wastewater specifically comprises the following steps:
step 1, biological phosphorus removal: the method comprises the following steps of putting phosphorus-containing wastewater into a regulating tank, then sequentially entering an anaerobic tank and an aerobic tank, and staying for 90min in the anaerobic tank and 150min in the aerobic tank;
step 2, feeding the phosphorus-containing wastewater subjected to biological phosphorus removal into a phosphorus removal reaction tank, adding ferrous sulfate into the phosphorus removal reaction tank for rapid reaction for 2min, wherein the adding amount of the ferrous sulfate is 350ppm, feeding the phosphorus-containing wastewater subjected to reaction into a primary sedimentation tank for mud-water separation, and discharging sludge at the bottom of the primary sedimentation tank into a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank, stirring, adding calcium hydroxide to adjust the pH value of the solution to 7.5, and adding polyaluminium chloride for charge neutralization, wherein the adding amount of the polyaluminium chloride is 75 ppm;
step 4, enabling the wastewater treated in the step 3 to enter a flocculation tank, and adding polyacrylamide into the flocculation tank for flocculation reaction, wherein the adding amount of the polyacrylamide is 2 ppm;
and 5, allowing the wastewater subjected to the flocculation reaction in the step 4 to flow into an inclined tube sedimentation tank under the action of gravity, performing mud-water separation, directly discharging supernatant reaching the standard, discharging lower-layer sludge into a sludge tank through a sludge discharge pump, further concentrating the sludge, and dehydrating the sludge by a sludge press to obtain sludge cakes for outward transportation.
The water quality of the effluent from examples 1 to 7 was measured as follows:
and (3) pH measurement: detecting with reference to GB/T6920-1986 glass electrode method for measuring pH value of water;
chemical oxygen demand: detecting according to HJ828-2017 bichromate method for determining chemical oxygen demand of water quality;
biochemical oxygen demand for five days: detecting according to HJ505-2009 'method for determining, diluting and inoculating biochemical oxygen demand for five days of water quality';
suspended matters: the detection is carried out according to GB11901-1989 gravimetric method for measuring suspended matters in water;
ammonia nitrogen: detecting according to HJ535-2009 Nanshi reagent spectrophotometry for measuring ammonia nitrogen in water;
total phosphorus: the detection is carried out according to GB11893-1989 ammonium molybdate spectrophotometry for determining total phosphorus in water.
TABLE 1 quality of discharged water
According to performance test results, the total phosphorus content of the discharged water quality is far lower than 0.5mg/L of the primary phosphorus discharge standard specified in GB8978-96 by adopting the phosphorus removal process disclosed by the invention, and in addition, the phosphorus removal process disclosed by the invention is stable in phosphorus removal and low in operation cost.
The present embodiment is only for explaining the present invention, and not for limiting the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of which are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. An enhanced phosphorus removal process for phosphorus-containing wastewater is characterized by comprising the following steps: the specific process steps are as follows:
step 1, biological phosphorus removal: the phosphorus-containing wastewater is put into a regulating tank and then sequentially enters an anaerobic tank and an aerobic tank,
the phosphorus-containing wastewater stays in an anaerobic tank for 60-120 min and stays in an aerobic tank for 120-180 min;
step 2, the phosphorus-containing wastewater after biological phosphorus removal enters a phosphorus removal reaction tank, and ferrous salt is added into the phosphorus removal reaction tank quickly
Reacting for 1-3 min at high speed, wherein the adding amount of ferrous salt is 300-400 ppm, phosphorus-containing wastewater after reaction flows into a primary sedimentation tank for mud-water separation, and sludge at the bottom of the primary sedimentation tank is discharged to a sludge tank for filter pressing treatment;
step 3, enabling the supernatant separated by the primary sedimentation tank to flow into a coagulation tank, introducing air into the coagulation tank and stirring the air and the supernatant
Adjusting the pH value of the solution to 7.0-7.5, and adding a coagulant aid for charge neutralization, wherein the adding amount of the coagulant aid is 50-100 ppm;
step 4, the wastewater treated in the step 3 enters a flocculation tank, a flocculating agent is added into the flocculation tank for flocculation reaction, and the flocculation is carried out
The adding amount of the coagulant is 1-3 ppm;
step 5, the wastewater after the flocculation reaction in the step 4 flows into an inclined tube sedimentation tank under the action of gravity, and after mud-water separation,
supernatant is directly discharged after reaching the standard, sludge at the lower layer is discharged into a sludge tank through a sludge discharge pump, the sludge is further concentrated and then is dewatered by a mud press, and the obtained mud cake is transported outside.
2. The enhanced phosphorus removal process for phosphorus-containing wastewater as claimed in claim 1, wherein: the ferrous salt in the step 2 at least comprises one of ferrous sulfate, ferrous chloride and ferrous carbonate.
3. The enhanced phosphorus removal process for phosphorus-containing wastewater as claimed in claim 1, wherein: the coagulant aid in the step 3 at least comprises one of polyaluminium chloride, polyaluminium sulfate, polyferric chloride and polyferric sulfate.
4. The enhanced phosphorus removal process for phosphorus-containing wastewater as claimed in claim 1, wherein: the pH of the solution is adjusted by calcium hydroxide in step 3.
5. The enhanced phosphorus removal process for phosphorus-containing wastewater as claimed in claim 1, wherein: and the flocculating agent in the step 4 at least comprises one of polyacrylamide and sodium polyacrylate.
6. The enhanced phosphorus removal process for phosphorus-containing wastewater as claimed in claim 1, wherein: and the flocculation reaction time in the step 4 is 90-120 min.
7. The enhanced phosphorus removal process for phosphorus-containing wastewater as claimed in claim 1, wherein: the adding proportion of the coagulant aid to the flocculant is 37.5: 1.
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