CN112830637B - Biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge - Google Patents

Biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge Download PDF

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Publication number
CN112830637B
CN112830637B CN202110081454.6A CN202110081454A CN112830637B CN 112830637 B CN112830637 B CN 112830637B CN 202110081454 A CN202110081454 A CN 202110081454A CN 112830637 B CN112830637 B CN 112830637B
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phosphorus
sewage
reaction tank
fsbr
fenton reaction
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CN112830637A (en
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戴欢涛
曹澄澄
张学杨
张建昆
曹苓玉
孙媛媛
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Xuzhou University of Technology
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Xuzhou University of Technology
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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
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/004—Sludge detoxification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • 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
    • C02F3/1268—Membrane bioreactor systems
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Inorganic Chemistry (AREA)
  • Fertilizers (AREA)
  • Treatment Of Sludge (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

The invention discloses a biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge, wherein an adopted biochemical combined sewage treatment system comprises an adjusting tank, a vertical flow type Fenton reaction tank, an FSBR (free fluidized bed reactor) and a biological filter, wherein the adjusting tank is communicated with the vertical flow type Fenton reaction tank through a pipeline; the vertical flow type Fenton reaction tank, the FSBR reactor and the biological filter method are combined, and the advantages are complemented with each other, so that organic phosphorus in sewage can be effectively removed, and the organic phosphorus can be converted into inorganic phosphorus to produce phosphate fertilizer, thereby not only reducing phosphorus pollution, but also providing a sustainable phosphorus recovery way for relieving the phosphorus shortage crisis.

Description

Biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge
Technical Field
The invention relates to a sewage treatment method, in particular to a biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge.
Background
The phosphorus removal of water is imminent. Phosphorus is a limiting element causing water eutrophication, and the action of phosphorus is far greater than that of nitrogen for causing water eutrophication, and the concentration of phosphorus in water is a key factor determining water eutrophication. Eutrophication affects the water quality of the water body, causes the reduction of water transparency, and makes sunlight difficult to penetrate through a permeable layer, thereby affecting the photosynthesis of plants in the water, being harmful to aquatic animals and causing a great amount of fish death. Meanwhile, because of water eutrophication, a large amount of algae with blue algae and green algae as dominant species grow on the surface of the water, and a layer of green scum is formed, so that harmful gas generated by the decomposition of organic substances accumulated at the bottom layer under anaerobic conditions and biotoxin generated by some plankton can also damage the fishes. Therefore, the efficient phosphorus removal of the sewage is not slow at all.
The total amount of the sludge is huge, the treatment cost is high, and the resource level is low. The volume of the sludge is increased year by year, and the resource of the phosphorus in the sewage can effectively make up for the shortage of phosphorus resources.
In addition, phosphorus is an important nutrient element and has irreplaceable effects on all organisms. With the rapid development of economy and the acceleration of urbanization, the demand of phosphorus as a fertilizer and a chemical product is increasing. Studies have indicated that phosphate in globally exploitable geological phosphate rock is expected to be depleted within 20 years, if based on current production rates. The sewage and wastewater contain a large amount of phosphorus, and if the part of phosphorus can be recycled in the sewage treatment process, the shortage of phosphorus resources can be effectively compensated. Therefore, the technology for capturing and utilizing the phosphorus in the sewage is developed, the phosphorus pollution can be reduced, and a sustainable phosphorus recovery way is provided for relieving the crisis of phosphorus shortage.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge, which can effectively remove organic phosphorus in sewage and convert the organic phosphorus into inorganic phosphorus to produce phosphate fertilizer, thereby not only reducing phosphorus pollution, but also providing a sustainable phosphorus recovery way for relieving the phosphorus shortage crisis.
In order to achieve the purpose, the invention adopts the technical scheme that: a biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge comprises the following specific steps:
A. assembling a biochemical combined sewage treatment system: the biochemical combined sewage treatment system comprises an adjusting tank, a vertical flow type Fenton reaction tank, an FSBR (membrane bioreactor) and a biological filter, wherein the adjusting tank is communicated with the vertical flow type Fenton reaction tank through a pipeline;
B. industrial sewage containing phosphorus enters a vertical flow type Fenton reaction tank through an adjusting tank, the water yield is controlled through the adjusting tank, degradation of high molecular organic matters and first removal of phosphorus are carried out on the industrial sewage in the vertical flow type Fenton reaction tank through oxidation and precipitation, and an iron mud deposition layer is formed; the sewage treated in the vertical flow Fenton reaction tank flows into the FSBR through a pipeline, phosphorus-feeding bacteria in the FSBR carry out aerobic absorption on organic phosphorus in the sewage, then release inorganic phosphorus (namely free phosphate radical) in an anaerobic manner, and simultaneously form a microorganism mud layer in the FSBR; then, after being treated by the FSBR, the sewage containing inorganic phosphorus flows back to the bottom of the vertical Fenton reaction tank through a return pipe; the iron mud deposition layer precipitates and intercepts inorganic phosphorus in the returned sewage in a mud layer through the action of physical and chemical combination to form high-phosphorus-content sludge; the returned sewage flows into the biological filter after secondary treatment of the vertical flow type Fenton reaction tank, the biological filter reduces the COD (namely chemical oxygen demand) index of the sewage by a biofilm method until the index meets the required standard and then is discharged, thereby completing the purification treatment process of reducing organic phosphorus in industrial sewage;
C. and C, after the industrial sewage is continuously treated for a period of time in the step B, stopping the sewage treatment work, taking out all the sludge in the vertical flow type Fenton reaction tank and part of the sludge in the FSBR, continuing the sewage treatment work in the step B, putting the taken-out sludge into a biochar preparation device for biochar preparation, and finally, producing the phosphate fertilizer by using the prepared biochar as a raw material by adopting a known method.
Further, the sludge can be kept to work normally after being taken out of the FSBR reactor.
Furthermore, a backflow controller is arranged on the backflow pipe and used for controlling the backflow speed of the sewage in the backflow pipe and preventing the backflow sewage from scattering the iron mud deposit layer so as to ensure the phosphorus removal rate of the backflow phosphorus-rich sewage due to the physical and chemical actions of the iron mud deposit layer.
Compared with the prior art, the invention has the following effects:
(1) the invention can convert organic phosphorus in the sewage into inorganic phosphorus, and can be used for producing phosphate fertilizer, and simultaneously reduce the phosphorus content in the sewage after treatment to reach the required discharge standard, thereby effectively solving the problem of difficult sludge treatment in China, greatly reducing the cost of sewage treatment and realizing the environmental protection effect;
(2) the invention realizes extremely high dephosphorization efficiency by reflux and effective utilization of the iron mud deposition layer, which is far beyond the traditional technology. Meanwhile, the invention effectively utilizes the sludge containing inorganic phosphorus generated in the treatment process through the biochar preparation process, and the sludge is made into phosphate fertilizer, thereby changing waste into valuable and having high resource utilization rate;
(3) the process adopts the vertical flow type Fenton reaction tank, combines the vertical flow type Fenton reaction tank with the FSBR reactor and the biological filter method, can effectively remove organic phosphorus in the sewage finally through complementary advantages, and can also convert the organic phosphorus into inorganic phosphorus to produce phosphate fertilizer, thereby not only reducing the phosphorus pollution, but also providing a sustainable phosphorus recovery way for relieving the crisis of phosphorus shortage.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure: 1. the system comprises a regulating tank, a vertical flow Fenton reaction tank, a FSBR reactor, a 4 iron mud deposition layer, a 5 biological filter, a 6 biological carbon preparation device, a 7 reflux controller.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1, the method comprises the following specific steps:
A. assembling a biochemical combined sewage treatment system: the biochemical combined sewage treatment system comprises an adjusting tank 1, a vertical flow type Fenton (Fenton) reaction tank 2, an FSBR (membrane bioreactor) reactor 3 and a biological filter 5, wherein the adjusting tank 1 is communicated with the vertical flow type Fenton reaction tank 2 through a pipeline, the vertical flow type Fenton reaction tank 2 is respectively communicated with the biological filter 5 and the FSBR reactor 3 through pipelines, the bottom of the FSBR reactor 3 is communicated with the bottom of the vertical flow type Fenton reaction tank 2 through a return pipe, and phosphorus-feeding bacteria are arranged in the FSBR reactor 3;
B. industrial sewage containing phosphorus enters a vertical flow type Fenton reaction tank 2 through an adjusting tank 1, the water yield is controlled through the adjusting tank 1, degradation of high molecular organic matters and first removal of phosphorus are carried out on the industrial sewage in the vertical flow type Fenton reaction tank 2 through oxidation and precipitation, and an iron mud deposition layer 4 is formed; the sewage treated in the vertical flow Fenton reaction tank 2 flows into the FSBR reactor 3 through a pipeline, phosphorus-feeding bacteria in the FSBR reactor 3 firstly carry out aerobic absorption on organic phosphorus in the sewage, then carry out anaerobic release on inorganic phosphorus (namely free phosphate radical), and simultaneously form a microorganism mud layer in the FSBR reactor 3; then, after being treated in the FSBR reactor 3, the sewage containing inorganic phosphorus flows back to the bottom of the vertical Fenton reaction tank 2 through a return pipe; the iron mud deposition layer 4 deposits and intercepts inorganic phosphorus in the returned sewage in a mud layer through the action of physical and chemical combination to form high-phosphorus-content sludge; the returned sewage flows into the biological filter 5 after being subjected to secondary treatment in the vertical flow type Fenton reaction tank 2, the biological filter 5 reduces the COD (chemical oxygen demand) index of the sewage by a biofilm method until the index meets the required standard and then is discharged, and therefore the purification treatment process of reducing organic phosphorus in industrial sewage is completed;
C. and C, after the industrial sewage is continuously treated for a period of time through the step B, stopping the sewage treatment work, taking out all the sludge in the vertical flow type Fenton reaction tank 2 and part of the sludge in the FSBR reactor 3, continuing the sewage treatment work of the step B, putting the taken-out sludge into a biochar preparation device 6 for biochar preparation, and finally, taking the biochar prepared and formed as a raw material to produce the phosphate fertilizer by adopting a known method.
Further, the sludge can be kept working normally after being taken out of the FSBR reactor 3.
Furthermore, the backflow pipe is provided with a backflow controller 7 for controlling the backflow speed of the sewage in the backflow pipe and preventing the backflow sewage from scattering the iron mud deposit layer so as to ensure the phosphorus removal rate of the backflow phosphorus-rich sewage due to the physical and chemical actions of the iron mud deposit layer.
The adjusting tank 1, the vertical flow type Fenton reaction tank 2, the FSBR reactor 3, the biological filter 5, the reflux controller 7 and the biochar preparation device 6 are all existing equipment.

Claims (3)

1. A biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge is characterized by comprising the following specific steps:
A. assembling a biochemical combined sewage treatment system: the biochemical combined sewage treatment system comprises an adjusting tank, a vertical flow type Fenton reaction tank, an FSBR reactor and a biological filter, wherein the adjusting tank is communicated with the vertical flow type Fenton reaction tank through a pipeline;
B. industrial sewage containing phosphorus enters a vertical flow type Fenton reaction tank through an adjusting tank, the water yield is controlled through the adjusting tank, degradation of high molecular organic matters and first removal of phosphorus are carried out on the industrial sewage in the vertical flow type Fenton reaction tank through oxidation and precipitation, and an iron mud deposition layer is formed; the sewage treated in the vertical flow Fenton reaction tank flows into the FSBR through a pipeline, phosphorus-feeding bacteria in the FSBR carry out aerobic absorption on organic phosphorus in the sewage, then release inorganic phosphorus in an anaerobic manner, and simultaneously form a microbial sludge layer in the FSBR; then, after being treated by the FSBR, the sewage containing inorganic phosphorus flows back to the bottom of the vertical Fenton reaction tank through a return pipe; the iron mud deposition layer precipitates and intercepts inorganic phosphorus in the returned sewage in a mud layer through the action of physical and chemical combination to form high-phosphorus-content sludge; the returned sewage flows into the biological filter after secondary treatment of the vertical flow type Fenton reaction tank, the COD index of the sewage is reduced by the biological filter through a biofilm method until the sewage meets the required standard and then is discharged, and therefore the purification treatment process of reducing organic phosphorus in industrial sewage is completed;
C. and C, after the industrial sewage is continuously treated for a period of time in the step B, stopping the sewage treatment work, taking out all the sludge in the vertical flow type Fenton reaction tank and part of the sludge in the FSBR, continuing the sewage treatment work in the step B, putting the taken-out sludge into a biochar preparation device for biochar preparation, and finally, producing the phosphate fertilizer by using the prepared biochar as a raw material by adopting a known method.
2. The method of claim 1, wherein the sludge is removed from the FSBR reactor and then kept working normally.
3. The method as claimed in claim 1, wherein the return pipe is provided with a return flow controller for controlling the return flow rate of the sewage in the return pipe.
CN202110081454.6A 2021-01-21 2021-01-21 Biochemical combined sewage treatment method capable of obtaining phosphorus-rich sludge Active CN112830637B (en)

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AU2021100520A AU2021100520A4 (en) 2021-01-21 2021-01-27 Biochemical combined sewage treatment method capable of obtaining phosphorus-enriched sludge

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116143090A (en) * 2023-04-17 2023-05-23 陕西燎原净化设备有限公司 Constant-pressure filtration treatment method and treatment device for phosphorus mud

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103979750A (en) * 2014-06-06 2014-08-13 瀚蓝环境股份有限公司 Reactor for sewage treatment and phosphorus recovery and method for recovering phosphorus by using same
CN107352745A (en) * 2017-08-11 2017-11-17 中机国际工程设计研究院有限责任公司 Kitchen garbage fermentation waste water processing method
CN107473513A (en) * 2017-09-04 2017-12-15 杭州宸祥环境工程有限公司 A kind of bamboo product waste water Fenton processing unit and method
CN111377558A (en) * 2020-03-17 2020-07-07 航天凯天环保科技股份有限公司 Synchronous treatment of Fenton iron mud and FePO obtaining4Resource utilization method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103979750A (en) * 2014-06-06 2014-08-13 瀚蓝环境股份有限公司 Reactor for sewage treatment and phosphorus recovery and method for recovering phosphorus by using same
CN107352745A (en) * 2017-08-11 2017-11-17 中机国际工程设计研究院有限责任公司 Kitchen garbage fermentation waste water processing method
CN107473513A (en) * 2017-09-04 2017-12-15 杭州宸祥环境工程有限公司 A kind of bamboo product waste water Fenton processing unit and method
CN111377558A (en) * 2020-03-17 2020-07-07 航天凯天环保科技股份有限公司 Synchronous treatment of Fenton iron mud and FePO obtaining4Resource utilization method

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