CN107235553B - Low-temperature aerobic granular sludge rapid culture method based on sludge incineration ash - Google Patents
Low-temperature aerobic granular sludge rapid culture method based on sludge incineration ash Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a low-temperature aerobic granular sludge rapid culture method based on sludge incineration granules, and belongs to the technical field of environmental engineering. The invention takes the sludge incineration ash as a carrier, can effectively realize the aggregation of sludge microorganisms on the sludge incineration ash, accelerates the formation of low-temperature aerobic granular sludge, shortens the granulation time of low-temperature activated sludge to 25 days, and shortens 11 days compared with a method without adding sludge incineration ash. The low-temperature aerobic granular sludge cultured by the method has higher strength, stable structure and better settleability, and can treat COD and NH in sewage4 +-N and PO4 3P has good removing ability to COD, NH4 +-N and PO4 3‑The P removal rate reaches 90.5%, 96.3% and 97.7%.
Description
Technical Field
The invention relates to a low-temperature aerobic granular sludge rapid culture method based on sludge incineration ash, belonging to the technical field of environmental engineering.
Background
The problem of water eutrophication is increasingly prominent, the discharge standard of sewage treatment is increasingly improved, the energy-saving and consumption-reducing operation of a sewage treatment plant is greatly influenced, and the control of the nitrogen and phosphorus content of the effluent of the sewage treatment plant and the research and development of a sewage treatment technology with reliable technology become important research points in the field of environmental pollution control. In the traditional biological phosphorus and nitrogen removal process, due to the lack of carbon source substances in sewage, the removal capacity of activated sludge on nitrogen and phosphorus is limited, especially the sludge performance and treatment effect are further restricted under the low-temperature condition, and the problems of sludge expansion and the like in different degrees exist, so that the normal operation of a process system is influenced. Aerobic granular sludge is a special biological membrane structure, and has great development potential due to good sedimentation performance, lower operation cost, higher biomass and treatment efficiency. However, the problems of slow start-up and poor operation stability of the reaction system caused by the inhibition of the microbial activity of the sludge particularly under the condition of low temperature (10 ℃) are more prominent, and further become the key point for restricting the technical development of the aerobic granular sludge.
Disclosure of Invention
In order to shorten and simplify the starting time of the aerobic granular sludge reactor and improve the operation efficiency of an aerobic granular sludge system, the invention improves the rapid culture method of the aerobic granular sludge under the low temperature (10 ℃) condition and inspects the treatment efficiency of the aerobic granular sludge on low-temperature sewage.
The first purpose of the invention is to provide a method for quickly culturing low-temperature aerobic granular sludge, which adds sludge incineration ash in the culture process of the aerobic granular sludge to accelerate the formation of the aerobic granular sludge under low-temperature conditions.
In one embodiment of the invention, the aerobic activated sludge is inoculated in the internal circulation sequencing batch gas stripping reactor, and the sludge incineration ash is added in the water inlet period.
In one embodiment of the invention, the aerobic activated sludge is derived from A2Activated sludge of an aerobic tank of a sewage treatment plant of the O process; the sludge concentration is 4000-5000 mg/L.
In one embodiment of the present invention, the particle size of the sludge incineration ash is less than 0.15 mm.
In one embodiment of the invention, the low temperature is 8-12 ℃.
In one embodiment of the invention, the method is adding sludge incineration ash in each reaction cycle of an internal circulation sequential batch gas stripping reactor; wherein the addition amount of the sludge incineration ash is 10-30 g/L.
In one embodiment of the present invention, the method essentially comprises the steps of: inoculating aerobic activated sludge into an internal circulation sequential batch airlift reactor, wherein the reaction period of each batch is 2.5-3.5h, the static water inlet period is 60 +/-10 min, the aeration reaction period is 112 +/-15 min, the sludge settling period is 3 +/-1 min, the rapid drainage period is 5 +/-1 min, and the drainage ratio is 50%; controlling the water temperature to be 8-10 ℃, and adjusting the pH value of the inlet water to be 7.0 +/-0.2; adding sludge incineration ash once in the water inlet period of each batch of reaction period, wherein the adding amount is 10-30 g/L.
In one embodiment of the present invention, the method essentially comprises the steps of: inoculating aerobic activated sludge into an internal circulation sequential batch airlift reactor, wherein the reaction period of each batch is 3h, the static water inlet period is 60min, the aeration reaction period is 112min, the sludge settling period is 3min, the rapid drainage period is 5min, and the drainage ratio is 50%; controlling the water temperature to be 8-10 ℃, and adjusting the pH value of the inlet water to be 7.0 +/-0.2; adding sludge incineration ash once in the water inlet period of each batch of reaction period, wherein the addition amount is 20 g/L.
The second purpose of the invention is to provide the low-temperature aerobic granular sludge prepared by the method.
The third purpose of the invention is to provide a low-temperature sewage treatment method, which uses the low-temperature aerobic sludge granules for sewage treatment.
The invention has the beneficial effects
The low-temperature aerobic granular sludge rapidly cultured by the invention is obtained from SBAR operated in the laboratory, and has better low-temperature sewage treatment capability. The sludge incineration ash is used as a carrier, so that the aggregation of sludge microorganisms on the sludge incineration ash can be effectively realized, the formation of low-temperature aerobic granular sludge is accelerated, and the granulation time of the low-temperature activated sludge is shortened to 25 days. The low-temperature aerobic granular sludge intensively cultured by the sludge incineration ash has higher strength, stable structure and better settling property, and can treat COD and NH in sewage4 +-N and PO4 3-P has good removal ability to COD, NH4 +-N and PO4 3-The removal rates of-P reach 90.5%, 96.3% and 97.7%, respectively. The strengthening effect of the sludge incineration ash effectively shortens the formation time of the granular sludge, accelerates the starting of the low-temperature SBAR and maintains the long-term stable operation of the SBAR, and has high feasibility. Provides a stable and efficient new process for treating domestic sewage in northern alpine regions and southern regions without heating facilities.
Drawings
FIG. 1 shows the settling performance and biomass of aerobic granular sludge;
FIG. 2 shows the change of extracellular polymeric substance;
FIG. 3 shows the particle size distribution and sedimentation rate of aerobic granular sludge;
FIG. 4 is a graph showing the removal efficiency of aerobic granular sludge on pollutants;
Detailed Description
Example 1: internal circulation sequential batch gas stripping reactor operating conditions
5L (the sludge concentration is 4500mg/L) of aerobic tank activated sludge of a sewage treatment plant adopting the A2O process is inoculated in a Sequencing Batch air stripping Reactor (SBAR) for culturing low-temperature aerobic granular sludge. The SBAR effective volume is 10.4L, the drainage ratio is 50% (guided out by a peristaltic pump), the reaction period is 3h, the static water inlet period is 60min, the aeration reaction period is 112min, the sludge settling period is 3min, and the rapid drainage period is 5 min. Controlling the water temperature to be 8-10 ℃, and adjusting the pH value of the inlet water to be 7.0 +/-0.2 (adjusting the pH value by adopting 1mol/L HCl and 1mol/L NaOH in the operation process). Controlling the content and proportion of air and nitrogen by a real-time control system to ensure the anaerobic state of a water inlet section and the aerobic state of a reaction section (the dissolved oxygen saturation in a static water inlet period is 0, and the dissolved oxygen saturation in an aeration reaction period is 100%); SRT was controlled at 25 days.
Example 2: aerobic granular sludge culture condition
The simulated wastewater composition is as follows: NaAc 8560mg/L, NH4Cl 2240mg/L，K2HPO4735mg/L，KH2PO4288mg/L, MgSO 4880 mg/L, KCl 350mg/L and trace element liquid 1 ml/L; the trace element liquid comprises the following components: FeCl3·6H2O 1.5g/L，H3BO30.15g/L，CuSO4·5H2O 0.03g/L，KI 0.03g/L，MnCl2·4H2O0.12g/L， Na2MoO4·2H2O 0.06g/L，ZnSO4·7H2O 0.12g/L，CoCl2·6H2O is 0.15 g/L. After wastewater is prepared, according to the following steps of feeding water into a carbon source water tank: water inlet of a nitrogen source water tank: tap water 1:1:8 was passed from the bottom of the reactor via 3 different peristaltic pumps into the SBAR of example 1. COD 600mg/L, NH of inlet water4 +-N 120mg/L，PO4 3--P16 mg/L. The method for cultivating aerobic granular sludge by using the above simulated wastewater is called method I, and the aerobic granular sludge cultivated by the method is placed in a reactor R1.
Screening and sorting sludge incineration ash with the particle size of less than 0.15mm as a carrier for sludge attachment, putting the sludge incineration ash into the SBAR in a water inlet period, and adding the sludge incineration ash into the SBAR every 1 reaction period, wherein the addition amount of the sludge incineration ash in each reaction is 20 g/L. The method for culturing aerobic granular sludge by coupling the method I with sludge incineration ash is called a method II, and the aerobic granular sludge cultured by the method is placed in a reactor R2.
Screening and sorting sludge incineration ash with the particle size of less than 0.2mm as a carrier for sludge attachment, putting the sludge incineration ash into the SBAR in a water inlet period, and adding the sludge incineration ash into the SBAR every 1 reaction period, wherein the addition amount of the sludge incineration ash in each reaction period is 10 g/L. The method for culturing aerobic granular sludge by coupling the method I with sludge incineration ash is called a method III, and the aerobic granular sludge cultured by the method is placed in a reactor R3.
Screening and sorting sludge incineration ash with the particle size of less than 0.1mm as a carrier for sludge attachment, putting the sludge incineration ash into the SBAR in a water inlet period, adding the sludge incineration ash every 1 reaction period, wherein the addition amount of the sludge incineration ash every time is 30 g/L. The method for culturing aerobic granular sludge by coupling the method I with sludge incineration ash is called as a method IV, and the aerobic granular sludge cultured by the method is placed in a reactor R4.
Example 3: low temperature aerobic granular sludge formation process
The sludge incineration ash is pumped into the reactor from the bottom of the reactor through a pump in a water inlet stage of SBAR operation, when the reactor is operated to an aeration stage, the sludge incineration ash is fully mixed with activated sludge microorganisms, and the microorganisms attach to the surface of the sludge incineration ash by using the sludge incineration ash as a carrier to increase the sedimentation speed of the microorganisms and prevent the sludge incineration ash from being discharged out of the reactor due to poor sedimentation performance in a water discharge stage. As shown in figure 1, the sludge biomass rapidly increases after a short reduction, which is close to 10g/L, the sedimentation performance is always better, the sludge SVI continuously decreases along with the operation of the reactor, and the sludge volume index SVI of R2 is stabilized between 40.2 ml/g and 45.0 ml/g after the aerobic granular sludge is formed. Due to the addition of the sludge incineration ash, the granulation time of the low-temperature activated sludge of R2 is shortened to 25d, which is averagely shortened by 11d compared with the traditional method for culturing the low-temperature aerobic granular sludge (Table 1). The aerobic granular sludge is light yellow and gradually develops into spherical and ellipsoidal appearances under the action of hydraulic shearing force.
TABLE 1 sludge characteristics of Low-temperature aerobic granular sludge enhanced by sludge incineration ash
a: removal rate of pollutants by granular sludge when low-temperature SBAR (styrene-butadiene-styrene) runs stably
Example 4: stability of low temperature aerobic granular sludge
R2 in example 2 is studied, and the change of the EPS content in the low-temperature activated sludge granulation process is shown in figure 2, the content of protein substances in EPS is gradually increased from 6.0 to 40.1mg/g MLSS; the content of polysaccharide substances is increased from 6.4 to 12.9mg/g MLSS. The content of PN/PS in EPS is about 3.1, which shows that the protein substances with higher concentration are important factors for forming low-temperature aerobic granular sludge, because inert substance sludge incineration ash is used as a carrier, the sludge strength also reaches 99.2%, the low-temperature aerobic granular sludge has a compact structure, and a suitable environment is provided for the good growth of sludge microorganisms.
Example 5: particle size distribution of low-temperature aerobic granular sludge
The aerobic granular sludge in R2 in example 2 is studied, and it is found that the average grain size of the obtained aerobic granular sludge is 2.2mm, the content of the granular sludge with the grain size of 0.5-3.0mm reaches 75.61% (FIG. 3A), the average grain size of the low-temperature aerobic granular sludge cultured by sludge incineration ash reinforcement is almost the same as that of the granular sludge in R1, the internal mass transfer and oxygen transfer capacity of the granular sludge is not reduced, and thus the aerobic granular sludge still maintains good removal efficiency of pollutants. The particle size of the low-temperature aerobic granular sludge subjected to sludge incineration ash reinforced culture has a good linear relation with the sedimentation rate thereof (fig. 3B): y is 9.9714x +4.5143, wherein y and x respectively represent the sedimentation rate (m/h) and the particle size (mm) of the granular sludge, and the granular sludge has good mud-water separation effect due to good sedimentation performance, so that the quality of effluent water is guaranteed to reach the standard stably.
Example 6: sewage removing efficiency of low-temperature aerobic granular sludge
For R in example 22, it is found that the activity of the inoculated activated sludge is greatly inhibited after the activated sludge is inoculated to the low-temperature SBAR, and the treatment efficiency of pollutants in the sewage is low. Along with the operation of the low-temperature reactor, sludge microorganisms gradually adapt to the low-temperature environment, and the pre-formed granular sludge has certain capability of resisting lower temperature due to the existence of EPS in the granular sludge, so the granular sludge can resist COD and NH in sewage4 +-N and PO4 3-The removal capacity of P gradually increases (FIG. 4) and gradually stabilizes, with the reactor effluent COD, NH4 +-N and PO4 3-P concentrations of 33.3, 0.8 and 0.4mg/L, respectively, corresponding to COD, NH4 +-N and PO4 3-The removal rate of-P reaches 90.5 percent, 96.3 percent and 97.7 percent, and heterotrophic bacteria, AOB, NOB, PAO and the like in the granular sludge have higher biological activity. NO in effluent2 --N and NO3 -The concentration of-N is 0.2 and 4.5mg/L respectively, the synchronous nitrification and denitrification rate is 90.2 percent, and the nitrification and denitrification rate reaches 0.99 mmol/L.h. The low-temperature aerobic granular sludge strengthened by the sludge incineration ash has good biological activity, and the COD oxidation capacity, the nitrification and denitrification capacity and the biological phosphorus removal capacity of the low-temperature aerobic granular sludge are all similar to those of the low-temperature aerobic granular sludge cultured in a traditional mode, so that the strengthening effect of the sludge incineration ash is shown, the formation time of the granular sludge is effectively shortened, the starting of the low-temperature SBAR is accelerated, the long-term stable operation of the low-temperature SBAR is maintained, and the high feasibility is realized in practical application.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A method for quickly culturing low-temperature aerobic granular sludge is characterized in that sludge incineration ash is added in the process of culturing the aerobic granular sludge, and the sludge incineration ash is used as a carrier for sludge attachment to accelerate the formation of the aerobic granular sludge under the low-temperature condition; the particle size of the sludge incineration ash is less than 0.15mm, and the addition amount is 20g/L or the particle size of the sludge incineration ash is less than 0.1mm, and the addition amount is 30 g/L; the method mainly comprises the following steps: inoculating aerobic activated sludge into an internal circulation sequential batch airlift reactor, wherein the reaction period of each batch is 2.5-3.5h, the static water inlet period is 60 +/-10 min, the aeration reaction period is 112 +/-15 min, the sludge settling period is 3 +/-1 min, the rapid drainage period is 5 +/-1 min, and the drainage ratio is 50%; controlling the water temperature to be 8-10 ℃, and adjusting the pH value of the inlet water to be 7.0 +/-0.2; adding sludge incineration ash once in the water inlet period of each batch of reaction period.
2. The method of claim 1, wherein the aerobic activated sludge is derived from A2Activated sludge of an aerobic tank of a sewage treatment plant of the O process; the sludge concentration is 4000-5000 mg/L.
3. The method according to claim 1, characterized in that it essentially comprises the following steps: inoculating aerobic activated sludge into an internal circulation sequential batch airlift reactor, wherein the reaction period of each batch is 3h, the static water inlet period is 60min, the aeration reaction period is 112min, the sludge settling period is 3min, the rapid drainage period is 5min, and the drainage ratio is 50%; controlling the water temperature to be 8-10 ℃, and adjusting the pH value of the inlet water to be 7.0 +/-0.2; adding sludge incineration ash once in the water inlet period of each batch of reaction period, wherein the addition amount is 20 g/L.
4. A low temperature aerobic granular sludge produced by the method of claim 1.
5. A method for treating sewage at a low temperature, which comprises using the low-temperature aerobic granular sludge according to claim 4 for sewage treatment.
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| CN110845002B (en) * | 2019-10-30 | 2024-02-06 | 桂林理工大学 | Method for improving sewage treatment and sludge combustion effects by coal dust activated sludge process |
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Effective date of registration: 20211025 Address after: 226300 Room 401 and 402, building 3, No. 299, Xingyuan Road, high tech Industrial Development Zone, Nantong City, Jiangsu Province Patentee after: Nantong suyuezhida Environmental Protection Technology Co.,Ltd. Address before: 1800 No. 214122 Jiangsu city of Wuxi Province Li Lake Avenue Patentee before: Jiangnan University |