CN107500472B - High-efficiency dephosphorization process - Google Patents

High-efficiency dephosphorization process Download PDF

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Publication number
CN107500472B
CN107500472B CN201710790675.4A CN201710790675A CN107500472B CN 107500472 B CN107500472 B CN 107500472B CN 201710790675 A CN201710790675 A CN 201710790675A CN 107500472 B CN107500472 B CN 107500472B
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supernatant
sewage
iii
reaction
carrying
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CN107500472A (en
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陈林
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Chengdu Ruida Electrical Machinery Industrial Co ltd
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Chengdu Ruida Electrical Machinery Industrial Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1257—Oxidation ditches
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2866—Particular arrangements for anaerobic reactors
    • C02F3/2873—Particular arrangements for anaerobic reactors with internal draft tube circulation

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention relates to a high-efficiency dephosphorization process, belonging to the field of sewage treatment. The high-efficiency dephosphorization process comprises the following steps: a. removing solid impurities in the sewage; b. adding a dephosphorizing agent into the sewage; c. standing and precipitating to obtain sludge I and supernatant I; d. c, carrying out anaerobic reaction on the supernatant obtained in the step c, and precipitating to obtain sludge II and supernatant II; e. and carrying out aerobic reaction on the supernatant II to obtain sludge III and supernatant III. The efficient dephosphorization process has good dephosphorization effect, can be used for the wastewater in the production of the white spirit with high-concentration phosphorus-containing sewage TP being more than or equal to 300mg/L, can reach TP being less than 0.5mg/L, meets the standard of table 3 in the emission standard of fermented alcohol and white spirit industrial water pollution (GB27631-2011), and does not block pipeline equipment.

Description

High-efficiency dephosphorization process
Technical Field
The invention relates to a high-efficiency dephosphorization process, belonging to the field of sewage treatment.
Background
Phosphorus is one of the major elements in the earth's system that maintain life, and is also an essential element that constitutes an organism and participates in metabolic processes. However, if the phosphorus content in the water body exceeds 20mg/L, eutrophication of the water body can be caused, a large amount of algae can be propagated, and after the algae die, the water body can generate musty odor and stink, so that the survival of aquatic organisms such as fishes is influenced.
In recent years, with the change of grain source structure, the phosphorus content in the sewage generated by the brewery becomes very high, TP is more than or equal to 300mg/L and COD is more than or equal to 30000mg/L in the wastewater generated by the production of white spirit. The wastewater treatment process of the winery can be discharged only after meeting the standard of table 3 in the emission standard of industrial water pollution of fermented alcohol and white spirit (GB27631-2011), and the current wastewater treatment system can not meet the requirement of dephosphorization of wastewater of the winery. Therefore, the development of a high-efficiency phosphorus removal method has very important significance.
Patent application 201610984769.0 discloses a method for removing phosphorus from high-phosphorus industrial sewage and recovering phosphorus resources, which comprises the following steps: respectively and uniformly mixing 0-0.5 part of inorganic electrolyte, 0-2.5 parts of water-soluble high-molecular polymer, 5-10 parts of calcium hydroxide or calcium oxide and 87-95 parts of soluble calcium salt to obtain the inorganic-organic composite phosphorus removal chemical reagent. The pH value of the sewage is adjusted by acid and alkali, non-orthophosphate ions in the sewage are oxidized by an oxidant, the acidity of the sewage is adjusted, inorganic-organic composite chemical phosphorus removal reagent is added to precipitate phosphorus in the sewage, the total phosphorus in the sewage is reduced to below 5mg/L from about 15500mg/L, but the method can block pipeline equipment and reduce the sewage treatment efficiency of a winery, and a large amount of phosphorus removal agent and oxidant are needed, so the method is not economical.
CN106430504A discloses a domestic sewage dephosphorizing agent, wherein the dephosphorizing agent A is prepared from the following components in parts by weight: 6.25 parts of polyaluminium chloride, 5.42 parts of attapulgite, 2.15 parts of aluminum sulfate and 2.36 parts of ferrous sulfate; the phosphorus removing agent B is prepared from the following raw materials in parts by weight: 1.85 parts of polyaluminium chloride, 6.4 parts of polyvinyl alcohol and 2.15 parts of ferrous sulfate. However, the phosphorus removing agent A can only be used under the condition that the pH of the sewage is 7.5-8.5, and the phosphorus removing agent B can only be used under the condition that the pH is 6.5-7.5, so that the pH of the sewage needs to be adjusted, a pipeline is easy to block, and the requirement for removing phosphorus from the sewage in the white spirit production cannot be met.
CN105502610A discloses a high-efficiency sewage dephosphorization flocculant, which comprises the following components: 30-40 parts of water; 4-8 parts of potassium perchlorate; 20-30 parts of sodium silicate; 25-35 parts of ferrous sulfate; 35-45 parts of a mixture of aluminum sulfate and magnesium sulfate; the weight ratio of aluminum sulfate to magnesium sulfate is 3-5: 1, but the sewage phosphorus removal agent mainly treats domestic sewage with the phosphorus content of 6mg/L at most and cannot meet the requirement of sewage phosphorus removal of a liquor factory.
Disclosure of Invention
The invention aims to provide a high-efficiency dephosphorization process.
In order to solve the technical problems, the efficient dephosphorization process comprises the following steps: a. removing solid impurities in the sewage; b. adding a dephosphorizing agent into the sewage; c. standing and precipitating to obtain sludge I and supernatant I; d. c, hydrolyzing and acidifying the supernatant I obtained in the step c, then carrying out anaerobic reaction, and precipitating to obtain sludge II and supernatant II; e. and carrying out aerobic reaction on the supernatant II to obtain sludge III and supernatant III.
Further, the dephosphorizing agent in the step b is composed of ferrous sulfate, magnesium chloride and polyaluminium chloride, and the pH value of the sewage is 3-6, preferably 4-6.
Further, the dephosphorizing agent is ferrous sulfate, magnesium chloride and polyaluminium chloride according to the mass ratio: 1-3: 5-8: 2 to 5.
Preferably, the addition amount of the dephosphorizing agent is 0.05-0.1%.
Further, the anaerobic reaction in the step d comprises the step of sequentially carrying out anaerobic reaction and moderate anaerobic reaction on the supernatant I.
Preferably, the deep anaerobic reaction in the step d adopts an IC reaction tower.
Preferably, the moderate anaerobic reaction in the step d is carried out by using a UASB reactor.
And further, the aerobic reaction in the step e comprises the step of carrying out aerobic reaction on the supernatant II sequentially through the oxidation ditch and the contact oxidation pond.
Preferably, the sludge III is added to the supernatant II under reflux.
Preferably, the efficient dephosphorization process further comprises the step f of adding a dephosphorization agent into the supernatant III to obtain sludge IV and supernatant IV.
The efficient dephosphorization process has good dephosphorization effect, can be used for the wastewater in the production of the white spirit with high-concentration phosphorus-containing sewage TP being more than or equal to 300mg/L, can reach TP being less than 0.5mg/L, meets the standard of table 3 in the emission standard of fermented alcohol and white spirit industrial water pollution (GB27631-2011), and does not block pipeline equipment.
The high-efficiency dephosphorization process of the invention chemically dephosphorizes before the sewage enters the biochemical system, and utilizes the high-efficiency dephosphorizing agent developed by the company, the phosphorus removal rate of the sewage with TP being more than or equal to 300mg/L can reach more than 80 percent, thereby greatly lightening the load of the subsequent biochemical system.
In addition, the efficient dephosphorization agent is applicable to the range of pH 3-6, the pH does not need to be adjusted before the dephosphorization agent is added, and the cost is saved.
The anaerobic reaction of the invention adopts IC + UASB to carry out anaerobic treatment, and the phosphorus release is carried out to the maximum extent. The aerobic reaction adopts an oxidation ditch and a contact oxidation process, so that the dephosphorization efficiency is maximized.
Detailed Description
The high-efficiency dephosphorization process comprises the following steps: a. removing solid impurities in the sewage; b. adding a dephosphorizing agent into the sewage; c. standing and precipitating to obtain sludge I and supernatant I; d. c, hydrolyzing and acidifying the supernatant I obtained in the step c, then carrying out anaerobic reaction, and precipitating to obtain sludge II and supernatant II; e. and carrying out aerobic reaction on the supernatant II to obtain sludge III and supernatant III.
Further, the dephosphorizing agent in the step b is composed of ferrous sulfate, magnesium chloride and polyaluminium chloride, and the pH value of the sewage is 3-6, preferably 4-6.
The preparation method of the high-efficiency phosphorus removing agent comprises the following steps: stirring ferrous sulfate, magnesium chloride and polyaluminium chloride uniformly in an environment with air humidity less than 50%, and baking for 30 minutes at 45 ℃ to prepare the high-efficiency phosphorus removing agent.
Further, the dephosphorizing agent is ferrous sulfate, magnesium chloride and polyaluminium chloride according to the mass ratio: 1-3: 5-8: 2 to 5.
Preferably, the addition amount of the dephosphorizing agent is 0.05-0.1%.
Further, the anaerobic reaction in the step d comprises the step of sequentially carrying out anaerobic reaction and moderate anaerobic reaction on the supernatant I.
Preferably, the deep anaerobic reaction in the step d adopts an IC reaction tower.
Preferably, the moderate anaerobic reaction in the step d is carried out by using a UASB reactor.
And further, the aerobic reaction in the step e comprises the step of carrying out aerobic reaction on the supernatant II sequentially through the oxidation ditch and the contact oxidation pond.
Preferably, the sludge III is added to the supernatant II under reflux.
Preferably, the efficient dephosphorization process further comprises the step f of adding a dephosphorization agent into the supernatant III to obtain sludge IV and supernatant IV.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1
Taking 50Kg, 300Kg and 150Kg of ferrous sulfate, magnesium chloride and polyaluminium chloride respectively, stirring the ferrous sulfate, the magnesium chloride and the polyaluminium chloride uniformly under the environment that the air humidity is less than 50%, and baking for 30 minutes at 45 ℃ to prepare 500Kg of dephosphorizing agent.
Removing solid impurities from 800KL of the sewage after brewing the white spirit through an automatic grating, then introducing the sewage into a comprehensive adjusting tank, adding the dephosphorizing agent into the sewage with TP (total phosphorus) of 310mg/L and pH of 5, introducing the sewage into a sedimentation tank, standing and precipitating to obtain sludge I and supernatant I, wherein the phosphorus content in the supernatant I is 60 mg/L.
Hydrolyzing and acidifying the supernatant I, sequentially introducing into an IC reaction tower and a UASB reactor for anaerobic reaction, and precipitating to obtain sludge II and supernatant II, wherein the phosphorus content in the supernatant II is 35 mg/L;
and (3) sequentially passing the supernatant II through an oxidation ditch to perform aerobic reaction, introducing the precipitate into a contact oxidation pond to perform contact oxidation, performing contact oxidation, precipitating to obtain sludge III and supernatant III, wherein the phosphorus content in the supernatant III is 5mg/L, and adding 50Kg of dephosphorizing agent into the supernatant III to obtain sludge IV and supernatant IV, wherein the phosphorus content in the supernatant IV is 0.3mg/L, and the discharge standard is met.
Example 2
100Kg, 320Kg and 180Kg of ferrous sulfate, magnesium chloride and polyaluminium chloride are respectively taken, the ferrous sulfate, the magnesium chloride and the polyaluminium chloride are uniformly stirred under the environment that the air humidity is less than 50 percent, and then the mixture is baked for 30 minutes at the temperature of 45 ℃ to prepare 600Kg of dephosphorizing agent.
Removing solid impurities from 800KL of the sewage after brewing the white spirit through an automatic grating, then introducing the sewage into a comprehensive adjusting tank, adding the dephosphorizing agent into the sewage with TP 395mg/L and pH of 5.5, introducing the sewage into a sedimentation tank, standing and precipitating to obtain sludge I and supernatant I, wherein the phosphorus content in the supernatant I is 58 mg/L.
Hydrolyzing and acidifying the supernatant I, sequentially introducing into an IC reaction tower and a UASB reactor for anaerobic reaction, and precipitating to obtain sludge II and supernatant II, wherein the phosphorus content in the supernatant II is 33 mg/L;
and (3) sequentially passing the supernatant II through an oxidation ditch to perform aerobic reaction, introducing the precipitate into a contact oxidation pond to perform contact oxidation, performing contact oxidation to obtain sludge III and supernatant III through precipitation after the contact oxidation, wherein the phosphorus content in the supernatant III is 4.5mg/L, returning the sludge III to add into the supernatant II, adding 50Kg of dephosphorizing agent into the supernatant III to obtain sludge IV and supernatant IV, and the phosphorus content in the supernatant IV is 0.25mg/L to reach the discharge standard.
Example 3
Taking 120Kg, 300Kg and 180Kg of ferrous sulfate, magnesium chloride and polyaluminium chloride respectively, stirring the ferrous sulfate, the magnesium chloride and the polyaluminium chloride uniformly under the environment that the air humidity is less than 50%, and baking for 30 minutes at 45 ℃ to prepare 600Kg of dephosphorizing agent.
Removing solid impurities from 800KL of sewage after liquor brewing through an automatic grating, then introducing the sewage into a comprehensive regulating tank, wherein TP of the sewage is 312mg/L, the pH of the sewage is 5.6, adding the dephosphorizing agent, introducing the sewage into a sedimentation tank, standing and precipitating to obtain sludge I and supernatant I, hydrolyzing and acidifying the supernatant I by using the phosphorus content of 57.5mg/L in the supernatant I, sequentially introducing into an IC (integrated circuit) reaction tower and a UASB (upflow anaerobic sludge blanket) reactor for anaerobic reaction, precipitating to obtain sludge II and supernatant II, and obtaining the phosphorus content of 31.5mg/L in the supernatant II;
and (3) sequentially carrying out aerobic reaction on the supernatant II through an oxidation ditch, introducing the precipitate into a contact oxidation pond for contact oxidation, precipitating after contact oxidation to obtain sludge III and supernatant III, wherein the phosphorus content in the supernatant III is 4.5mg/L, returning the sludge III to add into the supernatant II, adding 50Kg of dephosphorizing agent into the supernatant III to obtain sludge IV and supernatant IV, wherein the phosphorus content in the supernatant IV is 0.22mg/L, and the discharge standard is met.
Comparative example 1
The other conditions were the same as example 1, except that the pH of the wastewater was adjusted to 8, the above dephosphorizing agent was added, and the wastewater was introduced into a precipitation tank and allowed to stand for precipitation to obtain sludge I and supernatant I, the phosphorus content of which in supernatant I was 197 mg/L.
Comparative example 2
The other conditions are the same as example 1, the only difference is that the dephosphorizing agent does not contain magnesium chloride, the dephosphorizing agent is added, then the sewage is led into a sedimentation tank, and is kept still for sedimentation, so that sludge I and supernatant I are obtained, and the phosphorus content in the supernatant I is 238 mg/L.

Claims (9)

1. The efficient dephosphorization process is characterized by comprising the following steps: a. removing solid impurities in the sewage; b. adding a dephosphorizing agent into the sewage; c. standing and precipitating to obtain sludge I and supernatant I; d. c, hydrolyzing and acidifying the supernatant I obtained in the step c, then carrying out anaerobic reaction, and precipitating to obtain sludge II and supernatant II; e. carrying out aerobic reaction on the supernatant II to obtain sludge III and supernatant III; f. adding a dephosphorizing agent into the supernatant III to obtain sludge IV and supernatant IV;
the dephosphorizing agent in the step b is composed of ferrous sulfate, magnesium chloride and polyaluminium chloride, and the pH value of the sewage is 3-6;
the dephosphorizing agent is prepared from ferrous sulfate, magnesium chloride and polyaluminium chloride in a mass ratio of: 1-3: 5-8: 2-5;
the addition amount of the dephosphorizing agent is 0.05-0.1%.
2. The process of efficient dephosphorization according to claim 1: the method is characterized in that the pH of the sewage is 4-6.
3. The process of efficient dephosphorization according to claim 1 or 2: characterized in that the anaerobic reaction in the step d comprises the step of sequentially carrying out deep anaerobic reaction and moderate anaerobic reaction on the supernatant I.
4. The process of efficient dephosphorization according to claim 3, wherein: and d, adopting an IC reaction tower for deep anaerobic reaction.
5. The process of efficient dephosphorization according to claim 3, wherein: and d, adopting a UASB reactor for the moderate anaerobic reaction.
6. The process of efficient dephosphorization according to claim 1 or 2: the method is characterized in that the aerobic reaction in the step e comprises the step of carrying out aerobic reaction on the supernatant II sequentially through an oxidation ditch and a contact oxidation pond.
7. The process of efficient dephosphorization according to claim 3: the method is characterized in that the aerobic reaction in the step e comprises the step of carrying out aerobic reaction on the supernatant II sequentially through an oxidation ditch and a contact oxidation pond.
8. The process of efficient dephosphorization according to claim 1 or 2: characterized in that the sludge III is added to the supernatant II in a reflux manner.
9. The process of efficient dephosphorization according to claim 3: characterized in that the sludge III is added to the supernatant II in a reflux manner.
CN201710790675.4A 2017-09-05 2017-09-05 High-efficiency dephosphorization process Expired - Fee Related CN107500472B (en)

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CN111233253A (en) * 2020-01-16 2020-06-05 深圳市蓝清环境科技工程有限公司 Enhanced phosphorus removal process for phosphorus-containing wastewater

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CN1680199A (en) * 2004-04-09 2005-10-12 陈平 Pretreatment of industrial wastewater with high concentration and of difficult degradation
JP2009517002A (en) * 2005-04-06 2009-04-30 ヴェレニウム コーポレイション Enzymes and formulations for broad-specific decontamination of chemical and biological weapons
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CN107324474A (en) * 2017-09-05 2017-11-07 成都锐达机电实业有限公司 Efficient dephosphorization agent and its preparation method and application

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