CN114656032A - Method for strengthening granulation of salt-tolerant aerobic sludge by adding anaerobic particles - Google Patents
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- 239000010802 sludge Substances 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000003179 granulation Effects 0.000 title claims abstract description 23
- 238000005469 granulation Methods 0.000 title claims abstract description 23
- 238000005728 strengthening Methods 0.000 title claims abstract description 17
- 239000002245 particle Substances 0.000 title claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000008187 granular material Substances 0.000 claims abstract description 16
- 230000001965 increasing effect Effects 0.000 claims abstract description 10
- 238000004062 sedimentation Methods 0.000 claims abstract description 7
- 239000010865 sewage Substances 0.000 claims abstract description 6
- 230000033228 biological regulation Effects 0.000 claims abstract description 3
- 238000009826 distribution Methods 0.000 claims abstract description 3
- 238000012163 sequencing technique Methods 0.000 claims abstract description 3
- 239000002351 wastewater Substances 0.000 claims description 13
- 235000013619 trace mineral Nutrition 0.000 claims description 9
- 239000011573 trace mineral Substances 0.000 claims description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 8
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 8
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 8
- 229910003208 (NH4)6Mo7O24·4H2O Inorganic materials 0.000 claims description 4
- 229910021580 Cobalt(II) chloride Inorganic materials 0.000 claims description 4
- 229910021592 Copper(II) chloride Inorganic materials 0.000 claims description 4
- 239000007836 KH2PO4 Substances 0.000 claims description 4
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- 229910000357 manganese(II) sulfate Inorganic materials 0.000 claims description 4
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 4
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 4
- 239000011592 zinc chloride Substances 0.000 claims description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 4
- 238000005273 aeration Methods 0.000 claims description 3
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 2
- 229910052603 melanterite Inorganic materials 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 150000003839 salts Chemical class 0.000 description 11
- 238000011081 inoculation Methods 0.000 description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 241000589187 Rhizobium sp. Species 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000009302 aerobic granulation Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C02F3/1263—Sequencing batch reactors [SBR]
-
- 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
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
-
- 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
Abstract
The invention provides a method for strengthening granulation of salt-tolerant aerobic sludge by adding anaerobic granules, which comprises the following steps: 1) salt-tolerant aerobic granular sludge is sequentially put into a Sequencing Batch Reactor (SBR), and the salt-tolerant aerobic granular sludge is formed by mixing aerobic activated sludge and anaerobic granular sludge according to the volume ratio of 1: 1; 2) artificially synthesized simulated domestic sewage is used as inlet water, and the inoculated sludge is subjected to granulation culture in an SBR reactor; 3) operation regulation and control: during the operation of the whole SBR reactor, the salinity level is increased according to the gradient of increasing 1 percent every 14 days, the sedimentation condition of the sludge is observed, the sedimentation time of the sludge is continuously shortened, and the sedimentation time is stopped to be adjusted when the granular sludge is primarily formed; 4) regularly microscopic examination is carried out on the sludge, and the particle size distribution condition of the granular sludge in the SBR reactor is detected: when the proportion of the granular sludge larger than 0.2 mm reaches more than 70 percent, the start of the aerobic granular sludge system is considered to be finished. The method is simple and strong in operability, and effectively accelerates the formation process of the salt-tolerant granular sludge.
Description
Technical Field
The invention belongs to the technical field of sewage biotechnological treatment, and particularly relates to a method for strengthening salt-tolerant aerobic sludge granulation by adding anaerobic granules.
Background
The traditional activated sludge process has proven to be a viable and economically efficient treatment process for salt-containing wastewater that can meet the worldwide wastewater treatment demand of 5%. Aerobic granular sludge is an upgrading process based on the activated sludge process, and is receiving increasing attention as a promising biological treatment process due to its excellent settling properties, higher sludge concentration and lower reactor volume. Under the large background of 'carbon peak reaching' and 'carbon neutralization', a new efficient and energy-saving sewage treatment process needs to be explored urgently.
Research reports that factors such as substrate composition, organic load, shearing force, settling time, hydraulic retention time, reactor configuration and the like can cause great influence on the formation and long-term stable operation of aerobic granular sludge. Meanwhile, different types of inoculation flora and sludge are selected to achieve the purposes of shortening the starting time of the aerobic granular sludge and strengthening the performance of the aerobic granular sludge. For example, the inoculation of the aerobic granular sludge stored at-20 ℃ can effectively shorten the time required by sludge granulation, and the cultured mature aerobic granular sludge has good settling property and degradation property. Liu et al developed an aerobic granulation method using a self-polymerizing strain Rhizobium sp. NJUST18, which promotes the formation of aerobic granular sludge by utilizing the aggregation property of the strain itself. Liang and the like accelerate the granulation process by using pyrimidine degrading bacteria (NJUST 18+ NJUST 29), and the formed aerobic granular sludge has stronger agglomeration capacity and pyrimidine degrading capacity. Thus, the type of inoculated sludge plays a key role in the formation and performance of aerobic granules.
Therefore, the invention provides a method for using anaerobic granular sludge and a small amount of activated sludge as inoculated sludge, which achieves the purposes of accelerating the formation process of salt-resistant granular sludge and strengthening the salt resistance of aerobic granular sludge.
Disclosure of Invention
The invention aims to solve the technical problems of long culture time and poor salt tolerance of aerobic granular sludge in the prior art and provides a method for strengthening granulation of salt-tolerant aerobic sludge by adding anaerobic granules. According to the method, anaerobic granular sludge is added, a small amount of activated sludge is combined to serve as a method for inoculating sludge, the salt concentration is gradually improved, the operation parameters of the reactor such as sludge settling time are gradually shortened, and the like are optimized, so that the purposes of accelerating the formation process of salt-resistant granular sludge and strengthening the salt resistance of aerobic granular sludge are achieved.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
One aspect of the invention provides a method for strengthening granulation of salt-tolerant aerobic sludge by adding anaerobic granules, which comprises the following steps:
1) salt-tolerant aerobic granular sludge is sequentially put into a Sequencing Batch Reactor (SBR), and the salt-tolerant aerobic granular sludge is formed by mixing aerobic activated sludge and anaerobic granular sludge according to the volume ratio of 1: 1;
2) artificially synthesized simulated domestic sewage is used as inlet water, and the seeded sludge is subjected to granulation culture in an SBR reactor;
3) operation regulation and control: during the operation of the whole SBR reactor, the salinity level is increased according to the gradient of increasing 1 percent every 14 days, the settlement condition of the sludge is observed, the settlement time of the sludge is continuously shortened, and the settlement time is stopped being adjusted when the granular sludge is preliminarily formed;
4) regularly microscopic examination is carried out on the sludge, and the particle size distribution condition of the granular sludge in the SBR reactor is detected: when the proportion of the granular sludge larger than 0.2 mm reaches more than 70 percent, the start of the aerobic granular sludge system is considered to be finished.
Preferably, the suspended solid of the initial mixed liquid in the SBR reactor in the step 1) is 5.3 +/-0.1 g/L, and the sludge volume index is 147.7 +/-0.2 mL/g.
Preferably, the simulated wastewater in the step 2) is composed of: NH (NH)4Cl 500~650 mg/L；KH2PO4 140~200 mg/L；CaCl 2 150~200 mg/L；MgCl2 31~86 mg/L；FeSO4·7H2O 10~20 mg/L。
Preferably, trace elements can be further added into the simulated wastewater, and the volume ratio of the trace elements to the simulated wastewater is 0.05 mL: 1L of the total amount of the active ingredients.
Preferably, the trace elements consist of: h3BO3 50~60 mg/L；ZnCl2 50 ~60 mg/L；CuCl2 30~40 mg/L；MnSO4·H2O 50~65 mg/L；(NH4)6Mo7O24·4H2O 50~65 mg/L；AlCl3 50~65 mg/L；CoCl2·6H2O 50~65 mg/L；NiCl2 50~65 mg/L。
Preferably, the SBR reactor described in step 3) is operated for 4 cycles per day, wherein each operation cycle is operated in a water-in-anaerobic-aeration-sedimentation-water-out manner, and each operation cycle is 6 hours.
Preferably, in one operation period of the SBR reactor in the step 3), the water inlet time is 5 minutes, the anaerobic time is 0-30 minutes, the aeration time is 315-320 minutes, the sedimentation time is 3-30 minutes, and the water outlet time is 5 minutes.
Preferably, the COD of the inlet water in the step 3) is maintained at 1000-2500 mg/L.
Preferably, step 3) is performed by adding 2M NaHCO3Or HCl solution to maintain the feed water pH at 7.0 + -0.1.
Preferably, the salinity level is increased in step 3) by NaCl.
The invention has the following beneficial effects: in the process of culturing the salt-tolerant aerobic granular sludge, the salt concentration is gradually improved by artificially feeding the anaerobic granular sludge and combining a small amount of activated sludge as inoculated sludge, the salt-tolerant aerobic granular sludge is induced to be generated, the purposes of accelerating the formation process of the salt-tolerant granular sludge and strengthening the salt resistance of the aerobic granular sludge are achieved by optimizing reactor operation parameters such as gradually shortening the sludge settling time and the like, and the method for strengthening the granulation of the salt-tolerant aerobic sludge is provided for the application of the aerobic granular sludge technology to the treatment of high-salt industrial wastewater.
Drawings
FIG. 1 shows a schematic representation of the operation of the SBR reactor according to the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in FIG. 1, one embodiment of the present invention employs a laboratory-scale SBR reactor to culture salt-tolerant aerobic granular sludge and operate stably for about 160 days. The inoculated sludge consists of aerobic activated sludge and anaerobic granular sludge, and the volume ratio of the aerobic activated sludge to the anaerobic granular sludge is 1:1, and the total volume is 100 mL. The whole reactor system is controlled by a PLC, the reactor runs continuously and runs for 4 periods every day, and each period is 6. The Volume Exchange Ratio (VER) of the reactor operating cycle was 50%. Regulating and controlling the temperature within the range of 22 +/-2 ℃. Each operation period comprises 5 min water inlet, 0-30 min anaerobic phase, 315-320 min aeration phase, 3-30 min sedimentation phase and 5 min water outlet phase. In order to optimize the reactor performance better, the reactor operating parameters, such as settling time, influent organic loading and aerobic/anaerobic time, were adjusted and optimized during 160 d operation, and the parameters of the entire operation are shown in table 1.
TABLE 1 operating conditions and Performance of aerobic granular sludge at different salinity
The aerobic activated sludge used in the experiment is taken from the return sludge of a secondary sedimentation tank of a long-bridge municipal sewage treatment plant in Shanghai city, and the anaerobic granular sludge is derived from an anaerobic bioreactor built in the laboratory. The inoculated sludge consists of aerobic activated sludge and anaerobic granular sludge, and is mixed according to the volume ratio of 1:1, and the total volume is 100 mL. The initial Mixed Liquor Suspended Solids (MLSS) in the SBR system is 5.3 +/-0.1 g/L, and preferably 5.3 g/L in the embodiment; the Sludge Volume Index (SVI) was 147.7 + -0.2 mL/g, in this example 147.7 mL/g. Glucose is added into the inlet water as a carbon source, the COD of the inlet water is maintained at 1000-2500 mg/L, and the operation condition and the removal efficiency of the COD are shown in Table 1. The simulated wastewater comprises the following components: NH (NH)4Cl 500~650 mg/L；KH2PO4 140~200 mg/L；CaCl 2 150~200 mg/L；MgCl2 31~86 mg/L；FeSO4·7H2O10-20 mg/L, preferably (mg/L): NH (NH)4Cl （500）；KH2PO4（140）；CaCl2（150）； MgCl2(31) (ii) a And FeSO4·7H2And O (10). 2M NaHCO is added3Or the HCl solution makes the pH value of the simulated wastewater in the range of 7.0 +/-0.1 when the wastewater enters the water. Trace elements can also be added into the simulated wastewater, and the trace elements comprise: h3BO3 50~60 mg/L；ZnCl2 50 ~60 mg/L；CuCl2 30~40 mg/L；MnSO4·H2O 50~65 mg/L；(NH4)6Mo7O24·4H2O 50~65 mg/L；AlCl3 50~65 mg/L；CoCl2·6H2O 50~65 mg/L；NiCl250-65 mg/L. In this embodiment, 2.5 mL of the trace element solution is preferably added to 50L of the simulated wastewater, and the specific composition is (mg/L): h3BO3（50）； ZnCl2 （50）； CuCl2（30）； MnSO4·H2O （50）； (NH4)6Mo7O24·4H2O （50）； AlCl3（50）；CoCl2·6H2O （50）； NiCl2（50）。
In the SBR system, conventional aerobic activated sludge and anaerobic granular sludge are used as inoculation sludge, the oriented cultivation of salt-tolerant aerobic granular sludge is carried out in three different stages (figure 1), and the operation condition of the SBR system is shown in figure 1. And analyzing indexes such as MLSS, MLVSS, SVI and COD removal efficiency and the like in each operation stage.
And in the starting stage, anaerobic granular sludge is added into the SBR reactor as inoculation sludge, aerobic activated sludge is gradually adapted to salinity stress under the condition of lower salinity, the operation condition of the reactor is optimized, and water inlet parameters are adjusted. The addition of the anaerobic granular sludge accelerates the granulation process of the salt-tolerant aerobic granular sludge, and simultaneously, the addition of the anaerobic granules strengthens the structural stability of a salt-tolerant aerobic granular sludge system;
a domestication stage under salt pressure, namely, the salt concentration is increased in a stepped manner, the settling time is shortened, young salt-tolerant aerobic granular sludge is gradually formed in the SBR reaction, and non-salt-tolerant flora in an aerobic granular sludge system is gradually eliminated under salt stress;
and a salinity raising stage, namely, the mature salt-tolerant aerobic granular sludge is gradually formed under the condition of high salinity, and the salt-tolerant aerobic granular sludge occupies a dominant position in the SBR reactor.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for strengthening salt-tolerant aerobic sludge granulation by adding anaerobic granules is characterized by comprising the following steps:
1) salt-tolerant aerobic granular sludge is sequentially put into a Sequencing Batch Reactor (SBR), and the salt-tolerant aerobic granular sludge is formed by mixing aerobic activated sludge and anaerobic granular sludge according to the volume ratio of 1: 1;
2) artificially synthesized simulated domestic sewage is used as inlet water, and the seeded sludge is subjected to granulation culture in an SBR reactor;
3) operation regulation and control: during the operation of the whole SBR reactor, the salinity level is increased according to the gradient of increasing 1 percent every 14 days, the settlement condition of the sludge is observed, the settlement time of the sludge is continuously shortened, and the settlement time is stopped being adjusted when the granular sludge is preliminarily formed;
4) regularly microscopic examination is carried out on the sludge, and the particle size distribution condition of the granular sludge in the SBR reactor is detected: when the proportion of the granular sludge larger than 0.2 mm reaches more than 70 percent, the start of the aerobic granular sludge system is considered to be finished.
2. The method for intensifying salt-tolerant aerobic sludge granulation by adding anaerobic granules according to claim 1, wherein the suspended solids of the initial mixed liquor in the SBR reactor in the step 1) are 5.3 +/-0.1 g/L, and the sludge volume index is 147.7 +/-0.2 mL/g.
3. The method for strengthening salt-tolerant aerobic sludge granulation by adding anaerobic granules according to claim 1, wherein the simulated wastewater in the step 2) comprises the following components: NH (NH)4Cl 500~650 mg/L；KH2PO4 140~200 mg/L；CaCl2150~200 mg/L；MgCl2 31~86 mg/L；FeSO4·7H2O 10~20 mg/L。
4. The method for strengthening salt-tolerant aerobic sludge granulation by adding the anaerobic granules into the simulated wastewater according to the claim 1 or 3, wherein trace elements can be further added into the simulated wastewater, and the volume ratio of the trace elements to the simulated wastewater is 0.05 mL: 1L of the compound.
5. The method for enhancing granulation of salt-tolerant aerobic sludge by adding anaerobic granules according to claim 4, wherein the trace elements comprise: h3BO3 50~60 mg/L；ZnCl2 50 ~60 mg/L；CuCl2 30~40 mg/L；MnSO4·H2O 50~65 mg/L；(NH4)6Mo7O24·4H2O 50~65 mg/L；AlCl3 50~65 mg/L；CoCl2·6H2O 50~65 mg/L；NiCl2 50~65 mg/L。
6. The method for intensifying salt-tolerant aerobic sludge granulation by adding anaerobic granules according to claim 1, wherein the SBR reactor in the step 3) is operated for 4 periods every day, wherein each operation period is operated in a mode of water inlet-anaerobic-aeration-sedimentation-water outlet, and each operation period is 6 hours.
7. The method for strengthening salt-tolerant aerobic sludge granulation by adding anaerobic granules as claimed in claim 6, wherein in the operation period of the SBR reactor in step 3), the water inlet time is 5 minutes, the anaerobic time is 0-30 minutes, the aeration time is 315-320 minutes, the sedimentation time is 3-30 minutes, and the water outlet time is 5 minutes.
8. The method for strengthening salt-tolerant aerobic sludge granulation by adding anaerobic granules according to claim 1, wherein the COD of the influent water in step 3) is maintained at 1000-2500 mg/L.
9. The method for strengthening salt-tolerant aerobic sludge granulation by adding anaerobic granules according to claim 1, wherein in the step 3), 2M NaHCO is added3Or HCl solution to maintain the feed water pH at 7.0 + -0.1.
10. The method for intensifying granulation of salt-tolerant aerobic sludge by adding anaerobic granules according to claim 1, wherein the salinity level is increased by NaCl in the step 3).
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