CN116143294B - Granular sludge for denitrification and dephosphorization of town sewage and treatment method - Google Patents

Granular sludge for denitrification and dephosphorization of town sewage and treatment method Download PDF

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CN116143294B
CN116143294B CN202310410233.8A CN202310410233A CN116143294B CN 116143294 B CN116143294 B CN 116143294B CN 202310410233 A CN202310410233 A CN 202310410233A CN 116143294 B CN116143294 B CN 116143294B
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granular sludge
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sludge
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CN116143294A (en
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刘鹏
张麟
李金河
赵立伟
李同乐
李晟
姜威
王晖
王瀚卿
张慧
彭金利
韩梦
胥思羽
王连杰
李伟
岑本强
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TIANJIN CAPITAL ENVIRONMENTAL PROTECTION GROUP 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • 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

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  • Biodiversity & Conservation Biology (AREA)
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  • Hydrology & Water Resources (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
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  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention provides granular sludge for denitrification and dephosphorization of town sewage and a treatment method, wherein the granular sludge is domesticated by a method which is operated on a sequencing batch reactor and comprises a water inlet section, an anaerobic section, an aerobic section and an anoxic section, wherein the water inlet time is controlled to be 30-45 minutes; the residence time of the anaerobic section is 110-120 minutes, and the ORP is 150-40mv; the retention time of the aerobic section is 180% -220% of the sum of the retention time of the water inlet and the retention time of the anaerobic section, DO 2-4mg/L is controlled, and ORP is 40-140mv; the stay time of the anoxic section is 90% -120% of the stay time of the aerobic section. According to the invention, the domesticated granular sludge is treated by using microorganisms as the boost in the pollutant removal process in the subsequent sewage treatment process, so that the microorganisms fully exert the efficacy, and the efficient denitrification and dephosphorization are realized under the condition of not adding an external carbon source and a dephosphorization medicament.

Description

Granular sludge for denitrification and dephosphorization of town sewage and treatment method
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to granular sludge for denitrification and dephosphorization of town sewage and a treatment method.
Background
The common water treatment methods are mainly divided into three categories, namely a physical method, a chemical method and a biochemical method according to the treatment process characteristics. The biological method mainly comprises a biological membrane method and an activated sludge method, wherein A takes activated sludge flocs as a core 2 O and its improved process are widely used in town sewage treatment due to the characteristics of high pollutant removal efficiency, mature design, large scale, rich process operation experience, stable effluent quality, etc. But in A 2 The disadvantages of the O-based biochemical process are increasingly obvious in the technical requirements of pollution reduction and carbon reduction synergy of the sewage treatment industry and the environment-friendly low-carbon transformation of the whole society. Mainly comprises the following steps: (1) When the fluctuation of the quality of the inflow water is large and the dynamic change condition is complex, the potential is insufficient, and particularly when the sewage with low C/N ratio (C/N is less than or equal to 5) is treated, in order to remove pollutants efficiently and rapidly, a carbon source and a dephosphorization reagent are additionally added; (2) A is that 2 The O process is a single sludge system, has the functions of denitrification, dephosphorization and decarbonization for standard discharge, and needs continuous optimization of anaerobic-anoxic-aerobic section along flow combination and operation parameters when the process is set, but is differentContradiction exists between the reaction condition of functional microorganism and mud age, leading to A 2 The nitrogen, phosphorus and carbon removal efficiency of the O process is not fully exerted, so that the defect of water quality replacement by energy consumption and medicine consumption is caused; (3) A is that 2 The microorganism in the O process is in a floc state, so that an independent secondary sedimentation tank with large occupied area is needed for sludge-water separation, the sludge-water separation efficiency is low, the surface load of the secondary sedimentation tank is high, and the removal load of the whole set of process pollutants is low due to the fact that the density of sludge flocs is close to that of water and the quick sedimentation property is poor; (4) A is that 2 The denitrification and dephosphorization function of the O process requires internal reflux of nitrified liquid and external reflux of sludge, and additionally increases energy consumption and equipment maintenance cost. (5) The sewage treatment supporting facilities in China are imperfect, the phenomenon of 'running, leaking and leaking' of old pipe networks is obvious, COD (chemical oxygen demand) can be lost in the conveying process of sewage, a large amount of inorganic matters are entrained, and the like, so that the organic matters of the sludge are low, the carbon source in the sludge is insufficient, and the output of the sludge is high due to the additional addition of medicaments in the subsequent concentrated treatment.
Disclosure of Invention
In view of the above, the invention aims to provide a granular sludge and a treatment method for denitrification and dephosphorization of town sewage, which are characterized in that the organic electron donor in the town sewage is subjected to high-efficiency capturing-transferring-functionalization utilization to obtain domesticated granular sludge, and microorganisms are used as the boosting of the pollutant removal process in the subsequent sewage treatment process, so that the microorganisms fully exert the efficacy, and the high-efficiency denitrification and dephosphorization are realized under the condition that an external carbon source and a dephosphorization medicament are not added.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the granular sludge for denitrification and dephosphorization of town sewage is domesticated by a method which is operated on a sequencing batch reactor and comprises a water inlet-anaerobic section-aerobic section-anoxic section, wherein the water inlet time is controlled to be 30-45 minutes; the residence time of the anaerobic section is 110-120 minutes, and the ORP is 150-40mv; the retention time of the aerobic section is 180% -220% of the sum of the retention time of the water inlet and the retention time of the anaerobic section, DO 2-4mg/L is controlled, and ORP is 40-140mv; the stay time of the anoxic section is 90% -120% of the stay time of the aerobic section; the domestication time is 25-35 days; run for 1-2 cycles per day.
Preferably, in the domestication process, when the temperature is lower than 16 ℃, the heating temperature is controlled to be 16-19 ℃; the stirring speed is 35-45rpm, and every 1-2 hours, the stirring speed is increased to 55-65rpm, and the stirring speed is maintained for 30-60 seconds.
Preferably, when SV is 5 When the content is 17-22%, the sedimentation time is less than or equal to 3 minutes and less than or equal to 5 minutes; when SV is 3 When the sedimentation time is 17-32%, the sedimentation time is less than or equal to 3 minutes; and after the sedimentation time is reached, mud and water are separated, and the mud and water enter a drainage stage, wherein the drainage proportion of each period is 40-60% of the volume of the tank body.
Preferably, the concentration of each inorganic ion in the inlet water is Al 3+ 1-2mg/L、Na + 250-400mg/L、K + 20-30mg/L，Ca 2+ 39-64mg/L，Mg 2+ 38-42mg/L，Mn 2+ 0.2-0.4mg/L，Zn 2+ 0.3-0.5mg/L, 1.5-8.0mg/L of total phosphorus and 15-20mg/L of silicon element.
Preferably, COD in the inflow water is 100-700mg/L, sludge concentration is 2600-5600mg/L, ammonia nitrogen concentration is 20-60 mg/L, total nitrogen concentration is 20-70 mg/L and total phosphorus concentration is 1-6 mg/L.
In the granular sludge, more than 80% of the granular sludge has a particle size of more than 0.2mm, the particle size distribution is 0.2-4mm, and 1.0 < SV 5 /SV 30 ＜1.75，SVI 30 =40-60 mL/g; the sludge is provided with porous materials, and the porous materials are one or more than two of bar-shaped, sheet-shaped and umbrella-shaped; the organic matter content in the granular sludge is 41-62%.
The invention also provides application of the granular sludge in denitrification and dephosphorization of town sewage.
The invention also provides a method for denitrifying and dephosphorizing town sewage by using the granular sludge method, which continuously operates on a sequencing batch reactor for domesticating granular sludge, and comprises a water inlet section, an anaerobic section, an aerobic section and an anoxic section, wherein the water inlet time is controlled to be 30-45 minutes; the residence time of the anaerobic section is 110-120 minutes, and the ORP is 150-40mv; the retention time of the aerobic section is 180% -220% of the sum of the retention time of the water inlet and the retention time of the anaerobic section, DO 2-4mg/L is controlled, and ORP is 40-140mv; the stay time of the anoxic section is 90% -120% of the stay time of the aerobic section; when the temperature is lower than 16 ℃, heating and controlling the temperature to be 16-19 ℃; stirring rotorThe speed is 35-45rpm, every 1-2 hours, the stirring speed is increased to 55-65rpm, and the stirring speed is maintained for 30-60 seconds; when SV is 5 When the content is 17-22%, the sedimentation time is less than or equal to 3 minutes and less than or equal to 5 minutes; when SV is 3 When the sedimentation time is 17-32%, the sedimentation time is less than or equal to 3 minutes; and after the sedimentation time is reached, mud and water are separated, and the mud and water enter a drainage stage, wherein the drainage proportion of each period is 40-60% of the volume of the tank body.
More than 80% of the sludge after stable operation is granular sludge with the particle size more than 0.2mm, the particle size distribution is 0.2-4mm, and 1.0 < SV 5 /SV 30 ＜1.75，SVI 30 =40-60mL/g；
In operation, it was found that porous materials spontaneously form in the sludge, and SEM photographs showed that such porous materials can be rod-shaped, plate-shaped and umbrella-shaped, with a length of 1-6mm, and xrd analysis showed that the composition was zeolite and its structural analogues. The material can be used as porous filler to attach microorganisms, prolong the sludge age, increase the biomass, and improve the sedimentation property of the sludge and the pollutant removal efficiency; the organic content of the granular sludge is 41-62%, and endogenous denitrification can be realized in the anoxic section.
The invention cultures granular sludge in SBR by taking town sewage as inflow water, adopts the process mode of inflow water-anaerobic section-aerobic section-anoxic section for operation, and does not need to add medicament in the granulation process. When COD in the inflow water is 100-700mg/L and the sludge concentration is 2600-5600mg/L, the COD is reduced to 30-100mg/L after passing through the anaerobic section, the anaerobic section time is 110-120 minutes, and the ORP is 150-40mv. Organic matters in COD can be used for denitrification in an anaerobic section, can be captured by sludge, can be converted into a carbon source in the sludge and can release phosphate; in the aerobic section, DO 2-4mg/L and ORP 40-140mv are controlled, and the time of the aerobic section is 180% -220% of the total time of the water inlet and the anaerobic section. Dissolved oxygen gradually decays from the outer layer of the granular sludge to the inner core, and synchronous nitrification and denitrification can be performed. The process realizes one-carbon multi-purpose and has high-efficiency denitrification and dephosphorization capability under the condition of no addition of medicament. Solves the problems of carbon source competition, contradiction among sludge ages of denitrification and dephosphorization and the like existing in the denitrification and dephosphorization functions of the traditional activated sludge method;
an anoxic section is arranged behind the aerobic section, the anoxic section time is 90-120% of the aerobic section time, the organic content of the sludge is 45-60%, and the granular sludge rich in organic matters and internal carbon sources can be subjected to denitrification;
in the granular sludge system, due to long solid residence time, inorganic substances Al in the inlet water 3+ （1-2mg/L）、Na + （250-400mg/L）、K + （20-30mg/L），Ca 2+ （39-64mg/L），Mg 2+ （38-42mg/L），Mn 2+ （0.2-0.4mg/L），Zn 2+ (0.3-0.5 mg/L), total phosphorus (1.5-8.0 mg/L) and silicon element form porous materials such as zeolite, phosphate and the like, can be used as a microbial carrier, increases biomass, and is beneficial to autotrophic bacteria enrichment and granular sludge formation;
ca in the water 2+ （39-64mg/L），Mg 2+ （38-42mg/L），Al 3+ (1-2 mg/L) can form a precipitate with phosphate radical, and the total phosphorus removal capacity is improved.
Compared with the prior art, the granular sludge and the treatment method for denitrification and dephosphorization of town sewage have the following advantages:
the technical scheme of the invention is compared with the traditional A 2 O and the improved process thereof have simple operation mode, and the anaerobic-aerobic-anoxic units operate in time sequence, thereby avoiding A 2 The functions of anaerobic and anoxic sections are inhibited due to the simultaneous existence of inflow water and internal and external reflux in the O system, and the reaction time of each section is insufficient. In addition, the process can fully capture, convert and utilize organic matters in the water. Under the condition of no external carbon source and dephosphorization medicament, the device has multiple functions of one carbon, fully plays the capability of a biological system, realizes the efficient removal of nitrogen and phosphorus, ensures that the TN of effluent is less than 10mg/L and the TP is less than 0.3mg/L, and breaks through the traditional A 2 The problem that nitrogen and phosphorus cannot be removed simultaneously and efficiently in the O process is solved; the process can also fully utilize inorganic matters in the water to form porous materials and phosphate precipitates, so as to strengthen the efficiency of a biological system; the granular sludge has good mud-water separation performance and fast precipitation, can improve the removal load of a biological system, saves the tank capacity and reduces the occupied area. The process can be independently operated, and can be combined with a subsequent aerobic section and a secondary sedimentation tank as required to further remove COD and SS, so that the process is suitable for stable standard reaching of the first grade A and standard improvement of higher standards.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is an SEM image (30 times) of acclimated granular sludge according to example I of the invention;
FIG. 2 is a SEM image (200 times) of acclimated granular sludge according to example I;
FIG. 3 is an SEM image (100 times) of acclimated granular sludge according to example I of the present invention;
FIG. 4 is an XRD pattern of the acclimated granular sludge according to the first embodiment of the present invention; taking the granular sludge for XRD test, and overlapping the two spectrograms. Analysis with the jade6.0 software showed that the granular sludge contained the zeolite Gottardiite (Na 3 Mg 3 Ca 5 Al 19 Si 117 O 272 •93(H 2 O)），DPZ-1B（[Na(CH 3 ) 4 N] 96 Zn 96 P 96 O 192 •192H 2 O), stilbite-Ca (Na, K) Ca 2 Al 5 Si 13 O 36 •14H 2 O）；
FIG. 5 is an SEM image (20 times) of the granular sludge after operation of the system according to example eight of the invention;
FIG. 6 is an SEM image (100 times) of the granular sludge after operation of the system according to example eight of the invention;
FIG. 7 is an SEM image (50 times) of the granular sludge after operation of the system according to example eight of the invention;
fig. 8 is an SEM image (200 times) of the granular sludge after the system operation in the eighth embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
The parameters in the domestication process of the granular sludge for denitrification and dephosphorization of town sewage are as described in the first and second embodiments.
In addition, in the domestication process, when the temperature is lower than 16 ℃, the heating temperature is controlled to be 16-19 ℃; the stirring speed is 35-45rpm, and every 1-2 hours, the stirring speed is increased to 55-65rpm, and the stirring speed is maintained for 30-60 seconds.
When SV is 5 When the content is 17-22%, the sedimentation time is less than or equal to 3 minutes and less than or equal to 5 minutes; when SV is 3 When the sedimentation time is 17-32%, the sedimentation time is less than or equal to 3 minutes; after the sedimentation time is reached, mud-water separation is carried out, a drainage stage is carried out, and the drainage proportion of each period is 40-60% of the volume of the tank body; the domestication period is 25-35 days.
The concentration of each inorganic ion in the water is Al 3+ 1-2mg/L、Na + 250-400mg/L、K + 20-30mg/L，Ca 2+ 39-64mg/L，Mg 2+ 38-42mg/L，Mn 2+ 0.2-0.4mg/L，Zn 2+ 0.3-0.5mg/L, 1.5-8.0mg/L total phosphorus and 15-20mg/L silicon element;
in the granular sludge, more than 80 percent of the granular sludge has a grain diameter exceeding 0.2mm and is distributed at 0.2-4mm; the sludge is provided with porous materials, and the porous materials are one or more than two of bar-shaped, sheet-shaped and umbrella-shaped; the organic matter content in the granular sludge is 41-62%.
Example 1
When the COD of the inflow water is 430mg/L, the ammonia nitrogen is 51.62mg/L, the total nitrogen is 42.56mg/L, and the total phosphorus is 5.69mg/L, the inflow time is 30min, the anaerobic section is 120 min, and the ORP is 150mv; 330 minutes in the aerobic section, 3-4mg/L in the aerobic section and 95mv in the ORP; the anoxic section is 300 minutes, the water changing ratio is 50%, the operation is carried out for 1 cycle each day, after the operation is carried out for the first cycle, the ammonia nitrogen in the effluent is 19.94mg/L, the total nitrogen is 25.75mg/L, the sludge concentration is 1992mg/L, and the SVI is carried out 30 =90mL/g，SV 5 /SV 30 =1.33。
FIG. 1 is an SEM image (30 times) of acclimated granular sludge according to example I of the invention;
FIG. 2 is a SEM image (200 times) of acclimated granular sludge according to example I;
FIG. 3 is an SEM image (100 times) of acclimated granular sludge according to example I of the present invention;
FIG. 4 shows an embodiment of the present inventionXRD pattern of granular sludge after first acclimation; taking the granular sludge for XRD test, and overlapping the two spectrograms. Analysis with the jade6.0 software showed that the granular sludge contained the zeolite Gottardiite (Na 3 Mg 3 Ca 5 Al 19 Si 117 O 272 •93(H 2 O)），DPZ-1B（[Na(CH 3 ) 4 N] 96 Zn 96 P 96 O 192 •192H 2 O), stilbite-Ca (Na, K) Ca 2 Al 5 Si 13 O 36 •14H 2 O）。
Example two
When inflow COD 458mg/L, ammonia nitrogen 54.24mg/L, total nitrogen 45.18mg/L and total phosphorus 5.80mg/L, inflow time is 35min, anaerobic section is 125 min, ORP-89mv; 330 minutes in the aerobic section, 2-4mg/L in the aerobic section and 83mv in the ORP; 300 minutes in the anoxic section, 50 percent of water change ratio, 1 cycle per day, 1.98mg/L of effluent ammonia nitrogen, 20.61mg/L of total nitrogen, 2114mg/L of sludge concentration and SVI after the first cycle of operation 30 =80mL/g，SV 5 /SV 30 =1.71。
Stable operation period
Wherein, in the third embodiment to the fifth embodiment, the sludge acclimatized in the first embodiment is used, and in the sixth embodiment to the eighth embodiment, the sludge acclimatized in the second embodiment is used. The stable operation is to continue on the sequencing batch reactor of the acclimated granular sludge.
In the operation process, when the temperature is lower than 16 ℃, the heating control temperature is 16-19 ℃; the stirring speed is 35-45rpm, and every 1-2 hours, the stirring speed is increased to 55-65rpm, and the stirring speed is maintained for 30-60 seconds.
When SV is 5 When the content is 17-22%, the sedimentation time is less than or equal to 3 minutes and less than or equal to 5 minutes; when SV is 3 When the sedimentation time is 17-32%, the sedimentation time is less than or equal to 3 minutes; after the sedimentation time is reached, mud-water separation is carried out, a drainage stage is carried out, and the drainage proportion of each period is 40-60% of the volume of the tank body; the domestication period is 25-35 days.
The concentration of each inorganic ion in the water is Al 3+ 1-2mg/L、Na + 250-400mg/L、K + 20-30mg/L，Ca 2+ 39-64mg/L，Mg 2+ 38-42mg/L，Mn 2+ 0.2-0.4mg/L，Zn 2+ 0.3-0.5mg/L, 1.5-8.0mg/L total phosphorus and 15-20mg/L silicon element;
in the granular sludge, more than 80 percent of the granular sludge has a grain diameter exceeding 0.2mm and is distributed at 0.2-4mm; the sludge is provided with porous materials, and the porous materials are one or more than two of bar-shaped, sheet-shaped and umbrella-shaped; the organic matter content in the granular sludge is 41-62%.
Example III
When COD 564mg/L, ammonia nitrogen 47.5mg/L, total nitrogen 52.75mg/L and total phosphorus 4.96mg/L are fed, the water feeding time is 45min, the anaerobic section is 115 min, ORP-62 mv, the aerobic section is 330 min, the aerobic section DO 2-4mg/L and ORP 140mv; 300 minutes in the anoxic section, 50 percent of water change ratio, 13.2 hours of retention time in each period, 1.55mg/L of ammonia nitrogen in treated effluent, 2.75mg/L of total nitrogen, 0.12mg/L of total phosphorus, 3300 to 3400mg/L of sludge concentration, 60.91 percent of organic matters and SVI 30 =53mL/g，SV 5 /SV 30 =1.32。
Example IV
When the COD 363mg/L of the inflow water, the ammonia nitrogen 53.02mg/L and the total nitrogen 49.2mg/L and the total phosphorus 4.19mg/L, the inflow time is 45min, the anaerobic section is 115 min, and the ORP-72 mv; 330 minutes in the aerobic section, 2-4mg/L in the aerobic section and 95mv in the ORP; 300 minutes in the anoxic section, 50 percent of water change ratio, 13.2 hours of retention time per cycle, 0.55mg/L of ammonia nitrogen in treated effluent, 9.93mg/L of total nitrogen, 0.47mg/L of total phosphorus, 44.7mg/L of COD, 2800-2900mg/L of sludge concentration, 58.55 percent of organic matters and SVI 30 =52mL/g，SV 5 /SV 30 =1.73。
Example five
When COD 273mg/L of inflow water, 48.61mg/L of ammonia nitrogen and 48.46mg/L of total nitrogen and 6.70mg/L of total phosphorus are adopted, the inflow time is 40min, the anaerobic section is 120 min, and the ORP is 47mv; 340 minutes in the aerobic section, 2-3.5mg/L in the aerobic section, 113mv in the ORP; 420 minutes in the anoxic section, 50 percent of water change rate, 15.3 hours of retention time per cycle, 0.55mg/L of ammonia nitrogen in treated effluent, 2.40mg/L of total nitrogen, 0.38mg/L of total phosphorus, 34.2mg/L of COD, 2600-2700mg/L of sludge, 62.54 percent of organic matters and SVI 30 =60mL/g，SV 5 /SV 30 =1.31。
Example six
COD 278 when water is fed43.89mg/L of ammonia nitrogen, 40.29mg/L of total nitrogen and 3.37mg/L of total phosphorus, the water inlet time is 35min, the anaerobic period is 110 min, and the ORP is 92mv; 330 minutes in the aerobic section, 2-3.5mg/L in the aerobic section and 89mv in the ORP; the anoxic section is 400 minutes, the water changing ratio is 50%, the retention time is 15.3 hours in each period, the ammonia nitrogen of the treated effluent is 0.58mg/L, the total nitrogen is 8.13mg/L, the total phosphorus is 0.37mg/L, the COD is 31.30mg/L, the sludge concentration is 5500-5600mg/L, and the SVI is provided 30 =40mL/g，SV 5 /SV 30 =1.59。
Example seven
When the COD of the inlet water is 192mg/L, the ammonia nitrogen is 31.19mg/L, the total nitrogen is 34.37mg/L and the total phosphorus is 2.42mg/L, the inlet water time is 40min, the anaerobic section is 110 min, and the ORP is 132mv; 270 minutes in the aerobic section, 2-3.5mg/L in the aerobic section and 66mv in the ORP; 420 minutes in an anoxic section, 50 percent of water change rate, 14.0 hours of retention time per cycle, 0.22mg/L of ammonia nitrogen in treated effluent, 2.74mg/L of total nitrogen, 0.01mg/L of total phosphorus, 47.2mg/L of COD, 3300-3400mg/L of sludge concentration, 53.35 percent of organic matters and SVI 30 =55mL/g，SV 5 /SV 30 =1.07。
Example eight
When the COD of the inlet water is 227mg/L, the ammonia nitrogen is 39.26mg/L, the total nitrogen is 34.75mg/L and the total phosphorus is 2.43mg/L, the inlet water time is 40min, the anaerobic section is 120 min, and the ORP is between 110mv; 330 minutes in the aerobic section, 2-4mg/L in the aerobic section and 74mv in the ORP; 420 minutes in the anoxic section, 50 percent of water change rate, 15.2 hours of retention time per cycle, 0.57mg/L of ammonia nitrogen in treated effluent, 6.74mg/L of total nitrogen, 0.24mg/L of total phosphorus, 43.40mg/L of COD, 4700-4800mg/L of sludge concentration, 41.47 percent of organic matters and SVI 30 =40mL/g，SV 5 /SV 30 =1.32。
FIG. 5 is an SEM image (20 times) of the granular sludge after operation of the system according to example eight of the invention; FIG. 6 is an SEM image (100 times) of the granular sludge after operation of the system according to example eight of the invention; FIG. 7 is an SEM image (50 times) of the granular sludge after operation of the system according to example eight of the invention; fig. 8 is an SEM image (200 times) of the granular sludge after the system operation in the eighth embodiment of the present invention.

Claims (9)

1. A granular sludge for denitrification and dephosphorization of town sewage, which is characterized in that: domestication is carried out by a method which comprises running on a sequencing batch reactor, comprising a water inlet-anaerobic section-aerobic section-anoxic section, wherein the water inlet time is controlled to be 30-45 minutes; the residence time of the anaerobic section is 110-120 minutes, and the ORP is 150-40mv; the retention time of the aerobic section is 180% -220% of the sum of the retention time of the water inlet and the retention time of the anaerobic section, DO 2-4mg/L is controlled, and ORP is 40-140mv; the stay time of the anoxic section is 90% -120% of the stay time of the aerobic section; the domestication time is 25-35 days; running for 1-2 cycles each day; when the temperature is lower than 16 ℃, the heating control temperature is 16-19 ℃.
2. The granular sludge for denitrification and dephosphorization of town sewage as claimed in claim 1, wherein: in the domestication process, the stirring rotation speed is 35-45rpm, and every 1-2 hours, the stirring rotation speed is increased to 55-65rpm, and the stirring rotation speed is maintained for 30-60 seconds.
3. The granular sludge for denitrification and dephosphorization of town sewage as claimed in claim 1, wherein: when SV is 5 When the content is 17-22%, the sedimentation time is less than or equal to 3 minutes and less than or equal to 5 minutes; when SV is 3 When the sedimentation time is 17-32%, the sedimentation time is less than or equal to 3 minutes; and after the sedimentation time is reached, mud and water are separated, and the mud and water enter a drainage stage, wherein the drainage proportion of each period is 40-60% of the volume of the tank body.
4. The granular sludge for denitrification and dephosphorization of town sewage as claimed in claim 1, wherein: the concentration of each inorganic ion in the water is Al 3+ 1-2mg/L、Na + 250-400mg/L、K + 20-30mg/L、Ca 2+ 39-64mg/L、Mg 2+ 38-42mg/L、Mn 2+ 0.2-0.4mg/L、Zn 2+ 0.3-0.5mg/L, 1.5-8.0mg/L of total phosphorus and 15-20mg/L of silicon element.
5. The granular sludge for denitrification and dephosphorization of town sewage as claimed in claim 1, wherein: COD in the inflow water is 100-700mg/L, sludge concentration is 2600-5600mg/L, ammonia nitrogen concentration is 20-60 mg/L, total nitrogen concentration is 20-70 mg/L, and total phosphorus concentration is 1-6 mg/L.
6. The granular sludge for denitrification and dephosphorization of town sewage as claimed in claim 1, wherein: after stable operation, the particle size of more than 80% of the granular sludge exceeds 0.2mm, the particle size distribution is 0.2-4mm, and 1.0 < SV 5 /SV 30 ＜1.75，SVI 30 =40-60 mL/g; the sludge is provided with porous materials, and the porous materials are one or more than two of bar-shaped, sheet-shaped and umbrella-shaped; the organic matter content in the granular sludge is 41-62%.
7. Use of the granular sludge as claimed in any one of claims 1 to 6 for denitrification and dephosphorization of town sewage.
8. A method for denitrification and dephosphorization of town sewage by using the granular sludge as claimed in any one of claims 1 to 6, wherein: continuously running on a sequencing batch reactor of domesticated granular sludge, wherein the sequencing batch reactor comprises a water inlet section, an anaerobic section, an aerobic section and an anoxic section, and the water inlet time is controlled to be 30-45 minutes; the residence time of the anaerobic section is 110-120 minutes, and the ORP is 150-40mv; the retention time of the aerobic section is 180% -220% of the sum of the retention time of the water inlet and the retention time of the anaerobic section, DO 2-4mg/L is controlled, and ORP is 40-140mv; the stay time of the anoxic section is 90% -120% of the stay time of the aerobic section; when the temperature is lower than 16 ℃, heating and controlling the temperature to be 16-19 ℃; the stirring speed is 35-45rpm, and every 1-2 hours, the stirring speed is increased to 55-65rpm, and the stirring speed is maintained for 30-60 seconds; when SV is 5 When the content is 17-22%, the sedimentation time is less than or equal to 3 minutes and less than or equal to 5 minutes; when SV is 3 When the sedimentation time is 17-32%, the sedimentation time is less than or equal to 3 minutes; after the sedimentation time is reached, mud-water separation is carried out, a drainage stage is carried out, and the drainage proportion of each period is 40-60% of the volume of the tank body; after stable operation, more than 80% of the sludge is granular sludge with the particle size exceeding 0.2mm, the particle size distribution is 0.2-4mm, and SV is 1.0 < 5 /SV 30 ＜1.75，SVI 30 =40-60mL/g。
9. The method according to claim 8, wherein: the concentration of each inorganic ion in the water is Al 3+ 1-2mg/L、Na + 250-400mg/L、K + 20-30mg/L、Ca 2+ 39-64mg/L、Mg 2+ 38-42mg/L、Mn 2+ 0.2-0.4mg/L、Zn 2+ 0.3-0.5mg/L, 1.5-8.0mg/L total phosphorus, 15-20mg/L silicon element; COD in the inflow water is 100-700mg/L, sludge concentration is 2600-5600mg/L, ammonia nitrogen concentration is 20-60 mg/L, total nitrogen concentration is 20-70 mg/L, and total phosphorus concentration is 1-6 mg/L.
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CN101708923A (en) * 2009-11-16 2010-05-19 同济大学 Denitrifying phosphorus and nitrogen removal method for wastewater with low carbon-phosphorus ratio
CN108341546A (en) * 2018-02-01 2018-07-31 北京桑德环境工程有限公司 Advanced nitrogen dephosphorization system for handling domestic sewage in rural areas and method

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JPH04310296A (en) * 1991-04-09 1992-11-02 Nippon Steel Corp Acclimation and propagation of bacteria oxidizing and decomposing reducible sulfur compound, and biological treatment of waste water containing the same compound
CN101708923A (en) * 2009-11-16 2010-05-19 同济大学 Denitrifying phosphorus and nitrogen removal method for wastewater with low carbon-phosphorus ratio
CN108341546A (en) * 2018-02-01 2018-07-31 北京桑德环境工程有限公司 Advanced nitrogen dephosphorization system for handling domestic sewage in rural areas and method

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