CN111517460A - Domestication method of anaerobic granular sludge - Google Patents
Domestication method of anaerobic granular sludge Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000002351 wastewater Substances 0.000 claims abstract description 98
- 238000010790 dilution Methods 0.000 claims abstract description 43
- 239000012895 dilution Substances 0.000 claims abstract description 43
- 239000003085 diluting agent Substances 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 22
- 230000001174 ascending effect Effects 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 9
- 238000011081 inoculation Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 8
- 230000003139 buffering effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 27
- 230000000630 rising effect Effects 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 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 6
- 239000008103 glucose Substances 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 238000010992 reflux Methods 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000010806 kitchen waste Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
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- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
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Classifications
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
Abstract
The invention relates to a domestication method of anaerobic granular sludge, which adopts an intermittent water inlet mode, takes a to-be-treated wastewater diluent and artificial wastewater alternately as water inlet in a domestication early stage, and takes a to-be-treated wastewater diluent with gradually reduced dilution ratio as water inlet in a domestication later stage to finish the domestication process of the anaerobic granular sludge. Compared with the prior art, the method adopts an intermittent water inlet mode, takes the artificial wastewater and the wastewater diluent to be treated as the water inlet in the early stage of acclimatization alternately, can more safely, stably and quickly transit the initial stage of acclimatization buffering, and has the advantages of short time consumption, strong adaptability, excellent treatment effect and the like.
Description
Technical Field
The invention belongs to the technical field of biochemical sewage treatment, relates to a domestication method of anaerobic granular sludge, and particularly relates to a domestication method of anaerobic granular sludge for treating kitchen wastewater.
Background
With the gradual improvement of the living standard of Chinese residents, various waste phenomena on dining tables become more and more serious, and the yield of kitchen waste is increased rapidly. The kitchen waste wastewater has high organic matter content and rich nutrient elements such as nitrogen, phosphorus and the like. Therefore, the biochemical method is most economical and practical.
Anaerobic wastewater treatment is a low-cost wastewater treatment technology, and is a technology combining wastewater treatment and energy recycling. The anaerobic granular sludge technology has the advantages of wide application range, low energy consumption, high load, small amount of excess sludge and the like in the wastewater treatment, and particularly has more remarkable treatment effect on high-concentration organic wastewater. However, anaerobic granular sludge also has the defects of long culture time, high temperature requirement, poor denitrification and dephosphorization effects and the like, so that at present, many researches are focused on the research on the aspects of culture time, temperature and the like, and remarkable results are obtained.
The culture and domestication of the anaerobic granular sludge require certain water quality and operation conditions, such as the concentration of organic matters in the wastewater cannot be too high or too low, and nutrient elements in the water (including Ca) are sufficient2+、Mg2+、Fe2+Etc.), ensuring a certain upward flow rate and organic loading, etc. For the kitchen wastewater, due to the complex source and different water quality in different time periods, the domestication of the strains with obvious treatment effect has certain difficulty. Secondly, the traditional domestication method has a long period and is likely to fail in domestication, so that granular sludge is inactivated.
Therefore, it is very critical to develop a rapid acclimation method of anaerobic granular sludge for treating kitchen wastewater, which can solve the above problems.
Disclosure of Invention
The invention aims to provide a domestication method of anaerobic granular sludge, which aims to solve the problems of long domestication period and low domestication success rate of the anaerobic granular sludge in the prior art.
The purpose of the invention can be realized by the following technical scheme:
an acclimatization method of anaerobic granular sludge adopts an intermittent water inlet mode, and takes a to-be-treated wastewater diluent and artificial wastewater alternately as water inlet in the early stage of acclimatization, and takes a to-be-treated wastewater diluent with gradually reduced dilution ratio as water inlet in the later stage of acclimatization, thereby completing the acclimatization process of anaerobic granular sludge.
Further, the method specifically comprises the following steps:
1) in the early stage of acclimatization, adding initial anaerobic granular sludge into an external circulation type anaerobic bioreactor, alternately taking the dilution of wastewater to be treated with gradually increased chemical oxygen demand and artificial wastewater as intermittent water inlet, and carrying out anaerobic granular sludge acclimatization under the action of external circulation until the chemical oxygen demand of the reactor is increased to 5000-10000mg/L after water inlet;
2) in the domestication later stage, the wastewater diluent to be treated with the gradually reduced dilution ratio is taken as intermittent water inlet, anaerobic granular sludge domestication is carried out under the action of external circulation until the water inlet is the undiluted wastewater to be treated, the domestication process of the anaerobic granular sludge is completed, and the domesticated anaerobic granular sludge is obtained.
Through the effect of external circulation, a certain rising speed is provided for the reactor, and anaerobic granular sludge is prevented from being deposited at the bottom of the reactor.
As a preferred technical scheme, in the early stage of domestication, the increase of COD of each water inflow is 1200-2100 mg/L; in the post-domestication period, the waste water diluent to be treated is mixed liquid of waste water to be treated and diluent in the volume ratio of 1-10 to 1, and the diluent includes deionized water, tap water and glucose solution.
Further, in the step 1), the inoculation amount of the initial anaerobic granular sludge is 1/4-2/5 of the effective volume of the reactor, and the concentration is 50000-70000 mg/L;
the initial water inflow before domestication is the dilution of the wastewater to be treated, and the chemical oxygen demand in the reactor after the initial water inflow is 1200-1800 mg/L.
As a preferred technical scheme, the inoculation amount of the initial anaerobic granular sludge is 1/3 which is the effective volume of the reactor.
Further, in the step 2), the first water inlet in the post-domestication period is the dilution of the wastewater to be treated, and the dilution ratio of the dilution is not more than the dilution ratio of the dilution of the wastewater to be treated used in the last time in the pre-domestication period.
Furthermore, in the early stage and the later stage of acclimatization, the water inflow of each time is 1/3-2/3 of the effective volume of the external circulation type anaerobic bioreactor respectively, and the rising flow rate of the inflow water is 0.4-0.8m/h respectively.
As a preferable technical scheme, the water inflow is the effective volume 1/3-1/2 of the external circulation type anaerobic bioreactor.
In a preferable technical scheme, in the pre-domestication period and the post-domestication period, the ascending flow velocity of water is 0.5-0.7 m/h.
Further, the pH of the feed water is controlled to 6.5 to 7.5, preferably 6.8 to 7.3, in the pre-acclimation period and the post-acclimation period.
Furthermore, in the early period and the later period of acclimatization, the rising flow velocity in the reactor is 0.4-0.8m/h under the action of external circulation.
As the preferred technical scheme, the rising flow rate of the water inlet process is greater than that of the external circulation process, so that the excess flocculent sludge can be flushed out conveniently.
Further, the pre-domestication period and the post-domestication period respectively comprise 5-10 domestication periods, and each period is 60-84 h.
Further, in the acclimatization process, the acclimatization temperature is controlled to be 33-40 ℃, preferably 35-38 ℃, and more preferably 38 ℃.
Further, the method can be applied to quickly and safely acclimatizing common anaerobic granular sludge into anaerobic granular sludge capable of treating high-concentration kitchen wastewater.
Compared with the prior art, the invention has the following characteristics:
1) in the early stage of acclimatization, the mode that artificial wastewater and wastewater diluent to be treated are alternately used as water inlet is adopted, so that the accumulation of toxic substances in the granular sludge in the reactor is effectively reduced, and the early stage of acclimatization buffer can be safely, stably and quickly passed;
2) an intermittent timing water inlet mode is adopted in the whole process, so that the domestication process is safer, the labor cost is reduced, and the domestication efficiency is improved;
3) the domestication method has the advantages of short time consumption, strong adaptability, excellent treatment effect and the like, and can be used for realizing the targeted domestication process of anaerobic granular sludge of various kinds of wastewater difficult to treat besides the kitchen wastewater.
Drawings
FIG. 1 is a schematic view showing the structure of an external circulation upflow anaerobic sludge blanket used in example 1;
FIG. 2 is a graph showing the change of COD and COD removal rate of the influent and effluent water in the acclimatization process of example 1;
the notation in the figure is:
1-a reactor water outlet pipe, 2-a heat preservation water outlet pipe, 3-a sampling pipe, 4-a three-phase separator, 5-a settling zone return valve, 6-a heat preservation water inlet pipe, 7-a three-way valve, 8-a return main valve, 9-a flowmeter, 10-a circulating pump, 11-a reactor main body, 12-a wastewater inlet pipe, 13-a settling zone return pipe, 14-a reaction zone return pipe and 15-a return main pipe.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
in the embodiment, common anaerobic granular sludge is used as seed sludge, kitchen wastewater is treated as a target, and acclimatization is carried out in an external circulation anaerobic bioreactor (UASB) made of organic glass.
The concrete structure of the external circulation anaerobic bioreactor is shown in figure 1, and comprises a reactor main body 11, a three-phase separator 4 arranged at the top of the reactor main body 11, a wastewater inlet pipe 12 arranged at the bottom of the reactor main body 11, a reactor outlet pipe 1 arranged on the reactor main body 11, a reaction zone return pipe 14 arranged at the middle part of the reactor main body 11, a settling zone return pipe 13 arranged at the upper part of the reactor main body 11, a settling zone return valve 5 arranged on the settling zone return pipe 13, and a return header pipe 15; wherein, one end of the reflux main pipe 15 is communicated with the sedimentation zone reflux pipe 13 and the reaction zone reflux pipe 14, the other end is communicated with the waste water inlet pipe 12 through the three-way valve 7, and the reflux main pipe 15 is also sequentially provided with a circulating pump 10, a flowmeter 9 and a reflux main valve 8; the reactor main body 11 is also provided with a heat-insulating shell layer, a heat-insulating water inlet pipe 6 and a heat-insulating water outlet pipe 2 which are respectively communicated with the bottom and the top of the heat-insulating shell layer, and a plurality of sampling pipes 3 which penetrate through the heat-insulating shell layer and are communicated with the interior of the reactor main body 11.
The domestication process comprises the following steps:
1) adding the settled seed sludge from the top end of the UASB, wherein the settling efficiency is high because the seed sludge is granular sludge, the settling can be completed within about 5 hours, the inoculation amount of the sludge is 3L, which accounts for one third of the total volume of the reactor (the effective volume of the reactor is 9L), the concentration of the granular sludge is about 60000mg/L, and the reactor is subjected to sealing treatment;
2) an intermittent water inlet mode is adopted, diluted kitchen wastewater is taken as first water inlet, water inlet COD is controlled to enable COD in a reactor after water inlet to be 1500mg/L, the kitchen wastewater contains abundant nitrogen and phosphorus sources, extra nitrogen and phosphorus do not need to be added, a circulating pump 10 is started, liquid in the reactor flows back to a wastewater liquid inlet pipe 12 from return pipes at the upper part and the middle part of the reactor, the flow rate of circulating liquid is adjusted, and the rising speed is enabled to be 0.6 m/h; the second water inflow is artificial wastewater, and the kitchen wastewater has high nitrogen and phosphorus content and the reactor has sufficient nitrogen and phosphorus content, so that the artificial wastewater only contains glucose; the third water inflow is diluted kitchen wastewater, the fourth water inflow is artificial wastewater, the water inflow is alternated, the COD of the inflow is improved until the COD in the reactor is increased to about 9000mg/L after the water inflow, and the circulating pump 10 is closed in the water inflow and water outflow processes;
3) the method comprises the steps of adopting an intermittent water inlet mode, taking diluted kitchen wastewater as inlet water, sequentially mixing diluent and kitchen wastewater raw water, wherein the diluent is formed by mixing the kitchen wastewater and a diluent in a volume ratio of 1:1, 4:3, 5:2 and 6:1, wherein the diluent is tap water, so that an inlet water concentration gradient is formed, and if the treatment effect is good next time, the inlet water concentration ratio can be properly increased until the inlet water is undiluted kitchen wastewater, namely high-concentration kitchen wastewater, so that domestication is completed.
In the acclimatization process, kitchen wastewater is added into the reactor from a wastewater tank through a peristaltic pump; except for the water inlet and outlet processes, the circulating pump 10 continuously works, and in the water inlet process, the liquid inlet flow is adjusted to ensure that the rising speed of liquid in the reactor is 0.8m/h, so that the removal of redundant sludge is facilitated, and more granular sludge is facilitated to be formed; the water feeding interval is 72 hours each time, the water feeding amount is 3L, the temperature in the reactor is controlled at 38 ℃, and in addition, the pH of the liquid in the reactor containing the acidic kitchen waste water (pH 3-5) is controlled at 6.5-7.5 by adding sodium hydroxide or hydrated lime. The COD of the inlet and outlet water and the removal rate of the COD in the acclimatization process are changed as shown in figure 2, the removal rate is stably increased by adopting a method of repeatedly and alternately diluting the kitchen wastewater with artificial wastewater before 25d, wherein the kitchen wastewater diluent is adopted as the inlet water after 25d, the removal rate is slightly reduced but is still within a controllable range, and the alternate water inlet method has a better effect on the acclimatization of the granular sludge in comparison of data before and after a cross point (namely a node for converting alternate water inlet into wastewater diluent inlet).
Example 2:
in this embodiment, the UASB in example 1 is used to acclimate the common anaerobic granular sludge, and the specific acclimation method includes the following steps:
1) settling common anaerobic granular sludge, adding the settled initial anaerobic granular sludge into UASB (upflow anaerobic sludge blanket) at 33 ℃, and then carrying out closed treatment on the UASB, wherein the sludge inoculation amount is 1/4UASB effective volume, and the concentration is 51030 mg/L;
2) adding a wastewater dilution to be treated with pH of 6.5-7.5 and chemical oxygen demand of 3600mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.4m/h, wherein the water inflow is 1/3UASB effective volume;
3) starting a circulating pump 10 to make the liquid in the UASB circularly flow for 60h, and controlling the rising speed of the liquid in the UASB to be 0.4 m/h;
4) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
5) taking the dilution of the wastewater to be treated with gradually increased chemical oxygen demand and artificial wastewater (glucose solution) as inlet water (shown in table 1), repeating the steps 2) to 4) for 6 times, and controlling the COD of the last inlet water to ensure that the chemical oxygen demand in the reactor after water inlet is about 8000 mg/L;
TABLE 1
6) Adding a wastewater dilution to be treated with pH of 6.5-7.5 and chemical oxygen demand of 22890mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.4m/h, wherein the water inflow of the dilution is 1/3UASB effective volume;
7) starting a circulating pump 10 to make the liquid in the UASB circularly flow for 60h, and controlling the rising speed of the liquid in the UASB to be 0.4 m/h;
8) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
9) taking the dilution liquid of the wastewater to be treated with the dilution ratio gradually reduced as inlet water (shown in table 2), repeating the steps 6) to 8) for 4 times, and enabling the last inlet water to be undiluted wastewater to be treated;
TABLE 2
| Serial number | Inflow water | COD mg/L of reactor after |
| 8 | To-be-treated kitchen wastewater diluent | 7630 |
| 9 | To-be-treated kitchen wastewater diluent | 10650 |
| 10 | To be treatedKitchen waste water treatment diluent | 14430 |
| 11 | To-be-treated kitchen wastewater diluent | 18510 |
| 12 | To-be-treated kitchen wastewater | 20120 |
10) And taking the anaerobic granular sludge out of the top end of the UASB to obtain the acclimated anaerobic granular sludge.
Example 3:
in this embodiment, the UASB in example 1 is used to acclimate the common anaerobic granular sludge, and the specific acclimation method includes the following steps:
1) settling common anaerobic granular sludge, adding the settled initial anaerobic granular sludge into UASB (upflow anaerobic sludge blanket) at 40 ℃, and carrying out closed treatment on the UASB, wherein the sludge inoculation amount is 1/4UASB effective volume, and the concentration is 69500 mg/L;
2) adding a wastewater dilution to be treated with pH of 6.8-7.3 and chemical oxygen demand of 2120mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.8m/h, wherein the water inflow of the dilution is 2/3UASB effective volume;
3) starting the circulating pump 10 to make the liquid in the UASB circularly flow for 84h, and controlling the rising speed of the liquid in the UASB to be 0.8 m/h;
4) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
5) taking the dilution of the wastewater to be treated with gradually increased chemical oxygen demand and artificial wastewater (glucose solution) as inlet water alternately (the increase amount of COD in the reactor after each water inlet is controlled to be 470 +/-50 mg/L), repeating the steps 2) to 4) for 9 times, and controlling the COD of the last inlet water to ensure that the chemical oxygen demand in the reactor after the water inlet is about 6000 mg/L;
6) adding a wastewater dilution to be treated with pH of 6.8-7.3 and chemical oxygen demand of 8500mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.8m/h, wherein the water inflow of the dilution is 2/3UASB effective volume;
7) starting the circulating pump 10 to make the liquid in the UASB circularly flow for 84h, and controlling the rising speed of the liquid in the UASB to be 0.8 m/h;
8) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
9) taking the dilution liquid of the wastewater to be treated with the gradually reduced dilution ratio as inlet water (the dilution ratio is 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1 and 9:1 in sequence), repeating the steps 6) to 8) for 9 times, and enabling the last inlet water to be undiluted wastewater to be treated;
10) and taking the anaerobic granular sludge out of the top end of the UASB to obtain the acclimated anaerobic granular sludge.
Example 4:
in this embodiment, the UASB in example 1 is used to acclimate the common anaerobic granular sludge, and the specific acclimation method includes the following steps:
1) settling common anaerobic granular sludge, adding the settled initial anaerobic granular sludge into 35 UASB, and carrying out closed treatment on the UASB, wherein the sludge inoculation amount is 2/5UASB effective volume, and the concentration is 62310 mg/L;
2) adding a wastewater to be treated diluent with the pH of 6.8-7.3 and the chemical oxygen demand of 4050mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.7m/h, wherein the water inflow of the diluent is 2/5UASB effective volume;
3) starting the circulating pump 10 to make the liquid in the UASB circularly flow for 72h, and controlling the rising speed of the liquid in the UASB to be 0.5 m/h;
4) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
5) taking the dilution of the wastewater to be treated with gradually increased chemical oxygen demand and artificial wastewater (glucose solution) as inlet water alternately (the increase of COD of the reactor after each water inlet is controlled to be 980 +/-50 mg/L), repeating the steps 2) to 4), and controlling the COD of the last inlet water to ensure that the chemical oxygen demand in the reactor after the water inlet is about 5500 mg/L;
6) adding a wastewater dilution to be treated with pH of 6.8-7.3 and chemical oxygen demand of 10600mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.7m/h, wherein the water inflow of the dilution is 1/2UASB effective volume;
7) starting the circulating pump 10 to make the liquid in the UASB circularly flow for 72h, and controlling the rising speed of the liquid in the UASB to be 0.5 m/h;
8) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
9) taking the dilution liquid of the wastewater to be treated with the gradually reduced dilution ratio as inlet water (the dilution ratio is 2:1, 3:1, 4:1, 5:1, 6:1 and 7:1 in sequence), repeating the steps 6) to 8) for 7 times, and enabling the last inlet water to be undiluted wastewater to be treated;
10) and taking the anaerobic granular sludge out of the top end of the UASB to obtain the acclimated anaerobic granular sludge.
Example 5:
in this embodiment, the UASB in example 1 is used to acclimate the common anaerobic granular sludge, and the specific acclimation method includes the following steps:
1) settling common anaerobic granular sludge, adding the settled initial anaerobic granular sludge into UASB (upflow anaerobic sludge blanket) at 38 ℃, and carrying out closed treatment on the UASB, wherein the sludge inoculation amount is 1/3UASB effective volume, and the concentration is 63200 mg/L;
2) adding a wastewater dilution to be treated with pH of 6.8-7.3 and chemical oxygen demand of 2680mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.6m/h, wherein the water inflow of the dilution is 2/3UASB effective volume;
3) starting the circulating pump 10 to make the liquid in the UASB circularly flow for 72h, and controlling the rising speed of the liquid in the UASB to be 0.6 m/h;
4) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
5) taking the wastewater diluent to be treated with gradually increased chemical oxygen demand and artificial wastewater (glucose solution) as inlet water alternately (the COD increase amount in the reactor after each water inlet is controlled to be 600 +/-50 mg/L), repeating the steps 2) to 4) for 7 times, and controlling the COD of the last inlet water to ensure that the chemical oxygen demand in the reactor after the water inlet is 5800 mg/L;
6) adding a wastewater dilution to be treated with pH of 6.8-7.3 and chemical oxygen demand of 8250mg/L into the UASB through a wastewater inlet pipe 12 at an ascending flow rate of 0.6m/h, wherein the water inflow of the dilution is 2/3UASB effective volume;
7) starting the circulating pump 10 to make the liquid in the UASB circularly flow for 72h, and controlling the rising speed of the liquid in the UASB to be 0.6 m/h;
8) the circulating pump 10 is closed, and water is discharged through the water outlet pipe 1 of the reactor;
9) taking the dilution liquid of the wastewater to be treated with the gradually reduced dilution ratio as inlet water (the dilution ratio is 2:1, 3:1, 4:1, 5:1 and 6:1 in sequence), repeating the steps 6) to 8) for 6 times, and enabling the last inlet water to be undiluted wastewater to be treated;
10) and taking the anaerobic granular sludge out of the top end of the UASB to obtain the acclimated anaerobic granular sludge.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A domestication method of anaerobic granular sludge is characterized in that an intermittent water inlet mode is adopted, a to-be-treated wastewater diluent and artificial wastewater are alternately used as inflow water in a pre-domestication period, and a to-be-treated wastewater diluent with gradually reduced dilution ratio is used as inflow water in a post-domestication period, so that the domestication process of the anaerobic granular sludge is completed.
2. The acclimatization method of anaerobic granular sludge according to claim 1, which specifically comprises the following steps:
1) in the early stage of acclimatization, adding initial anaerobic granular sludge into an external circulation type anaerobic bioreactor, alternately taking the dilution of wastewater to be treated with gradually increased chemical oxygen demand and artificial wastewater as intermittent water inlet, and carrying out anaerobic granular sludge acclimatization under the action of external circulation until the chemical oxygen demand of the reactor is increased to 5000-10000mg/L after water inlet;
2) in the domestication later stage, the wastewater diluent to be treated with the gradually reduced dilution ratio is taken as intermittent water inlet, anaerobic granular sludge domestication is carried out under the action of external circulation until the water inlet is the undiluted wastewater to be treated, the domestication process of the anaerobic granular sludge is completed, and the domesticated anaerobic granular sludge is obtained.
3. The acclimatization method of anaerobic granular sludge as claimed in claim 2, wherein in the step 1), the inoculation amount of the initial anaerobic granular sludge is 1/4-2/5, the concentration is 50000-70000 mg/L;
the initial water inflow before domestication is the dilution of the wastewater to be treated, and the chemical oxygen demand in the reactor after the initial water inflow is 1200-1800 mg/L.
4. The acclimatization method of anaerobic granular sludge according to claim 2, wherein in the step 2), the first influent water in the post-acclimatization period is the diluted solution of the wastewater to be treated, and the dilution ratio of the diluted solution is not greater than the dilution ratio of the diluted solution of the wastewater to be treated used in the last time in the pre-acclimatization period.
5. The acclimatization method of anaerobic granular sludge according to claim 2, wherein in the pre-acclimatization period and the post-acclimatization period, the water inflow per time is 1/3-2/3 of the effective volume of the external circulation type anaerobic bioreactor, and the upward flow rate of the inflow is 0.4-0.8 m/h.
6. The acclimatization method of anaerobic granular sludge according to claim 2, wherein the pH of influent water is controlled to 6.5-7.5 in the pre-acclimatization period and the post-acclimatization period.
7. The acclimatization method for anaerobic granular sludge according to claim 2, wherein the ascending flow velocity in the reactor is 0.4-0.8m/h under the action of the external circulation in the pre-acclimatization period and the post-acclimatization period.
8. The acclimatization method for anaerobic granular sludge according to claim 2, wherein the pre-acclimatization period and the post-acclimatization period comprise 5-10 acclimatization periods, each period being 60-84 h.
9. The acclimatization method for anaerobic granular sludge according to claim 1, wherein in the acclimatization process, the acclimatization temperature is controlled to be 33-40 ℃.
10. The acclimatization method of anaerobic granular sludge according to claim 1, which can be applied to rapidly and safely acclimatize common anaerobic granular sludge into anaerobic granular sludge capable of treating high-concentration kitchen wastewater.
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