CN108217922B - Municipal sewage treatment method - Google Patents
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- CN108217922B CN108217922B CN201611200491.XA CN201611200491A CN108217922B CN 108217922 B CN108217922 B CN 108217922B CN 201611200491 A CN201611200491 A CN 201611200491A CN 108217922 B CN108217922 B CN 108217922B
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- 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
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Abstract
The invention belongs to the technical field of sewage treatment, and particularly relates to a municipal sewage treatment method. The method comprises the following steps: providing initial activated sludge, and performing granulation culture on the initial activated sludge by adopting municipal sewage for 59-71 days to obtain aerobic granular sludge of 15-16 g/L; leading the municipal sewage to a container containing the aerobic granular sludge, and performing purification treatment comprising aeration and sedimentation to obtain purified water; the operating parameters of the purification treatment are as follows: pH is 6-8, apparent air velocity is more than 1.4cm/s, and sludge age is 10-15 days. The method has high municipal sewage treatment efficiency, the removal rate of COD (chemical oxygen demand) of the municipal sewage is stabilized to be more than 96%, the removal rate of ammonia nitrogen reaches 99%, and the removal rate of total phosphorus is stabilized to be more than 85%.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a municipal sewage treatment method.
Background
Aerobic granular sludge is a dense biopolymer which is formed by activated sludge microorganisms through a self-fixing process under an aerobic environment and has a compact structure and a regular shape. The aerobic granular sludge not only has the advantages of the anaerobic granular sludge, but also avoids the inherent defects of the anaerobic granular sludge due to the anaerobic bacteria component. The aerobic granular sludge has a relatively compact microstructure, excellent sedimentation performance, higher concentration sludge interception and diverse microbial populations, and has the following advantages: (1) better mud-water separation; (2) higher bioreactor capacity per unit volume: (3) can bear higher impact load; (4) the volume requirement on the secondary sedimentation tank is reduced: (5) meanwhile, organic matters and nutrient substances such as nitrogen, phosphorus and the like are removed.
The traditional activated sludge treatment sewage has the problems of low sedimentation speed, low efficiency, high capital construction cost and the like. The utilization of the granular sludge formed in the aerobic treatment system for the municipal sewage biological treatment is an innovation of the current aerobic treatment process, and opens up a new field of aerobic biological treatment. At present, the municipal sewage treatment by aerobic granular sludge is mainly in the theoretical research level, and the research mainly stays in the research of the aspects of the formation mechanism, the characteristics, the nitrogen and phosphorus removal mechanism, the sludge granulation main control factor and the like of the aerobic granular sludge in laboratory simulation sewage, but in the practical practice, no report of the municipal sewage treatment by utilizing the aerobic granular sludge is available.
Disclosure of Invention
The invention aims to provide a method for treating municipal sewage by using aerobic sludge granulation, and aims to solve the technical problems of low municipal sewage treatment efficiency, high cost and the like in the prior art.
The invention is realized in such a way that a municipal sewage treatment method comprises the following steps:
providing initial activated sludge, and performing granulation culture on the initial activated sludge by adopting municipal sewage for 59-71 days to obtain aerobic granular sludge of 15-16 g/L;
leading the municipal sewage to a container containing the aerobic granular sludge, and performing purification treatment comprising aeration and sedimentation to obtain purified water; the operating parameters of the purification treatment are as follows: pH is 6-8, apparent air velocity is more than 1.4cm/s, and sludge age is 10-15 days.
The invention has the following beneficial effects: (1) the municipal sewage purification treatment efficiency is high, after the method is used for purifying the sewage, the removal rate of COD in the municipal sewage is stabilized to be more than 96%, the removal rate of ammonia nitrogen is up to 99%, and the removal rate of total phosphorus is stabilized to be more than 85%; (2) the method has simple process, environmental protection and low cost, and has good practical significance and popularization and application value for promoting the rapid development of the sewage treatment technology in China.
Drawings
FIG. 1 is a diagram showing structural changes of sludge during a municipal sewage treatment method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing changes in the COD concentration of municipal sewage during a municipal sewage treatment process according to an embodiment of the invention;
FIG. 3 is a schematic diagram showing the change of the ammonia nitrogen concentration of municipal sewage during the municipal sewage treatment method according to the embodiment of the invention;
FIG. 4 is a schematic representation of the change in total phosphorus concentration of municipal sewage during a municipal sewage treatment process according to an embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the present invention, the "primary activated sludge" refers to a raw activated sludge which is derived from a biological pond of a sewage plant, is rich in various microorganisms, has a loose structure, and is not subjected to granulation culture using municipal sewage. "acclimatization of flocculent sludge" refers to the acclimatization of the initial activated sludge from the biological pond with municipal sewage, so that the microorganisms in the sludge can gradually adapt to the sludge in the municipal sewage operation mode. The primary granular sludge refers to fine irregular granular sludge formed after flocculent sludge is further cultured. The 'granular culture' refers to a process of gradually culturing the initial activated sludge to form granular sludge which is full in shape, large in size and mature in performance and can be used for purifying sewage. The volume exchange rate is the ratio of the volume of sewage per aeration and sedimentation to the volume of the reactor in a single culture period or sewage purification treatment process, and the volume exchange rate multiplied by the volume of the reactor is the volume of single sewage treatment.
In an embodiment of the present invention, a method for culturing aerobic granular sludge is provided, which includes the following steps:
s01: providing initial activated sludge, and performing granulation culture on the initial activated sludge by adopting municipal sewage for 59-71 days to obtain aerobic granular sludge of 15-16 g/L;
s02: introducing municipal sewage into a container containing the aerobic granular sludge, and performing purification treatment including aeration and sedimentation to obtain purified water; the operating parameters of the purification treatment were: pH is 6-8, apparent air velocity is more than 1.4cm/s, and sludge age is 10-15 days.
In the present embodiment, the aerobic granular sludge suitable for the subsequent municipal sewage purification treatment can be obtained through the step S01. The existing water for culturing aerobic granular sludge is generally simulated sewage prepared by industrial raw materials such as sodium acetate and the like, the composition and concentration of the simulated sewage can be freely adjusted, the property is stable, and the granulation of the sludge can be quickly realized. Although the municipal sewage has poor water quality stability and a slow culture process, the municipal sewage is not suitable for purification treatment after the sludge is mature in culture, and water can be taken in situ in a sewage plant (station) without cost. In the embodiment, the sludge is granulated and cultured by using the practical municipal sewage for the first time, and because the quality of the municipal sewage is unstable, 15-16g/L of aerobic granular sludge is obtained after 59-71 days of culture, and the subsequent purification treatment of the municipal sewage is most facilitated in the technical scheme within the range of the culture days and the concentration of the aerobic granular sludge. In the purification treatment process of the step S02, the setting of the operation parameters is most beneficial to the growth of microorganisms capable of purifying sewage, and can better purify municipal sewage, so that the obtained purified water is environment-friendly and safe, and has no damage to the environment.
In a word, under the synergistic effect of the two steps, the efficiency of treating the municipal sewage by the method is the highest, the removal rate of COD (chemical oxygen demand) of the municipal sewage is stabilized to be more than 96%, the removal rate of ammonia nitrogen can reach more than 99%, and the removal rate of total phosphorus is stabilized to be more than 85%. Finally, discharging the purified water: the COD concentration is less than 20mg/L, the ammonia nitrogen concentration is less than 0.5mg/L, and the total phosphorus concentration is less than 0.9 mg/L.
Specifically, in step S01, the initial activated sludge granulation culturing process includes:
s011: the initial activated sludge is subjected to first culture for 18-22 days by municipal sewage to obtain 7-8g/L of domesticated flocculent sludge.
S012: and (3) carrying out secondary culture on the domesticated flocculent sludge for 18-22 days by using municipal sewage to obtain 11-12g/L granular sludge primary bodies.
S013: and (3) performing third culture on the primary granular sludge body by using municipal sewage for 23-27 days to obtain 15-16g/L aerobic granular sludge.
The initial activated sludge granulation culture is mainly to culture activated sludge by using municipal sewage in reality to obtain aerobic granular sludge which is most suitable for purifying the municipal sewage, thereby further purifying the municipal sewage. In this embodiment, through the three different stages of culture processes, sludge granulation is gradually improved through synergistic effect, and the sewage treatment performance is improved, so that the aerobic granular sludge with excellent settling performance and a concentration of 15-16g/L is finally obtained, and the aerobic granular sludge can be used for subsequent municipal sewage purification treatment.
More specifically, in the above step S011, the first culture process comprises a plurality of first culture periods comprising a first water-in, a first aeration, a first sedimentation and a first water-out step, wherein the first aeration treatment time is 185-200min and the first sedimentation treatment time is 20-35 min. And the volume exchange rate of the first culture period is 38-42%, preferably 38%, 40%, 42%, most preferably 40%; the number of days of the first culture is preferably 18 days, 20 days, 22 days, and most preferably 20 days.
The first culture stage is a domestication process, in order to ensure the effluent effect and higher sludge concentration, the process selects longer operation period and settling time, selects smaller volume exchange rate, and improves and enhances the sludge settling performance and treatment capacity at this stage. In the preferable range of the aeration time, the sedimentation time, the volume exchange rate and the culture days, the sedimentation performance and the treatment capacity of the domesticated flocculent sludge after the culture process are improved, and the optimal activated sludge is provided for the subsequent steps.
More specifically, in step S012 above, the second culture process includes a plurality of second culture periods, and the second culture periods include a second water inlet step, a second aeration step, a second sedimentation step, and a second water outlet step, wherein the second aeration treatment time is 205-210min, and the second sedimentation treatment time is 10-15 min. And the volume exchange rate of the third culture period is 48-52%, preferably 48%, 50%, 52%, most preferably 50%; the number of days of the second culture is preferably 18 days, 20 days, 22 days, and most preferably 20 days.
In the step S012, after the sludge settling performance is improved in the step S011, the settling time is gradually reduced to leave the sludge with better settling performance, and the volume exchange rate is slightly increased to increase the organic load of the influent water. In the preferable aeration time, sedimentation time and volume exchange rate, and the range of culture days, flocculent sludge is condensed into fine irregular granular sludge initial bodies, which is optimally beneficial to the formation of subsequent aerobic granular sludge.
More specifically, in the above step S013, the third culturing process comprises a plurality of third culturing periods comprising third influent, third aeration, third sedimentation and third effluent steps, wherein the third aeration treatment time is 150-155min and the third sedimentation treatment time is 5-10 min. Volume exchange rate of 58-62% of the third culture period, preferably 58%, 60%, 62%, most preferably 60%; the number of days of the second culture is preferably 23 days, 25 days, 27 days, and most preferably 25 days.
Aerobic granular sludge appears in the third culture stage, and the aerobic granular sludge has higher sedimentation speed and better sewage treatment capacity, so that the sedimentation time is reduced again while the operation cycle time is shortened, and the sludge with good sedimentation performance and strong sewage treatment capacity is left in the system more reasonably to form the aerobic granular sludge with excellent performance. In the preferable aeration time, sedimentation time, volume exchange rate and culture days, the aerobic granular sludge with good sedimentation performance and strong sewage treatment capacity is most easily formed, can exert the optimal activity level and is beneficial to the subsequent purification treatment of municipal sewage.
Specifically, in step S02, the aeration time in the purification treatment process is 150 to 155min, and the settling time is within 5 min; the volume exchange rate is 58-62%, preferably 58%, 60%, 62%, most preferably 60%.
The step S02 is also the substantive stage of municipal sewage purification, and the process can adjust the parameters of running time, volume exchange rate and the like of single-cycle sewage purification treatment according to the water quality indexes of the municipal sewage to be fed in and out, so that the sewage treatment efficiency and treatment capacity are optimized to the maximum extent. The operating parameters were: under the conditions that the pH value is 6-8, the apparent air velocity is more than 1.4cm/s and the sludge age is 10-15 days, the water quality condition of municipal sewage is integrated, the aeration time in the purification treatment process can be 150-155min, and the sedimentation time can be within 5 min; the volume exchange rate is 58-62%, preferably 58%, 60%, 62%, most preferably 60%. Under the conditions of the optimized aeration time, sedimentation time and volume exchange rate, the aerobic granular sludge has the best capacity for municipal sewage purification treatment.
In any embodiment of the invention, the COD concentration in the municipal sewage is 400-500mg/L, the ammonia nitrogen concentration is 20-30mg/L, and the total phosphorus concentration is 4-6 mg/L. The parameter is the water quality content range of daily municipal sewage, and the purification treatment capacity of the aerobic granular sludge cultured by the municipal sewage in the parameter range on the municipal sewage reaches the optimal state.
The invention is described in further detail with reference to a part of the test results, which are described in detail below with reference to specific examples. In the following examples, the corresponding parameter ranges during the municipal wastewater treatment process are shown in Table 1 below, and the final operating parameters for the wastewater purification treatment are shown in Table 2 below.
TABLE 1
TABLE 2
Example 1
The embodiment of the invention provides a municipal sewage treatment method, which comprises the following steps:
s11: providing initial activated sludge particles, and carrying out granulation culture on the initial activated sludge for 71 days by adopting municipal sewage to obtain aerobic granular sludge of 16 g/L. The method specifically comprises the following steps:
s111: culturing the initial activated sludge for 22 days by using municipal sewage, wherein the single period of the process is 4 hours, wherein water inflow is 10min, aeration is 185-200min, standing and settling are 35-20min, and water outflow is 10 min; the volume exchange rate is 42 percent, and finally 8g/L domesticated flocculent sludge is obtained.
S112: culturing the domesticated flocculent sludge with municipal sewage for another 22 days, wherein the single period of the process is 4h, wherein the water inflow is 10min, the aeration is 205-210min, the standing and the sedimentation are 10-15min, and the water outflow is 10 min; the volume exchange rate is 52 percent, and the primary body of the granular sludge of 12g/L is finally obtained.
S113: continuously culturing the granular sludge precursor with municipal sewage for 27 days, wherein the single period of the process is 3h, water inflow is 10min, aeration is 150-155min, standing and settling are 10-5min, and water outflow is 10 min; the volume exchange rate is 62 percent, and finally 16g/L of aerobic granular sludge is obtained.
S12: and (4) leading the municipal sewage to a container containing the aerobic granular sludge obtained in the step S11, and performing purification treatment comprising aeration and sedimentation to obtain purified water. The purification treatment process comprises the following steps; the single period is 3h, wherein the water is fed for 10min, the aeration is carried out for 155min, and the standing and the sedimentation are carried out for less than 5 min; the volume exchange rate was 62%, and the operating parameters are shown in Table 2. The municipal sewage is treated by the aerobic granular sludge for 109 days.
Because of municipal sewage quality of water in the reality is unstable, in the municipal sewage that this embodiment provided, COD concentration is 400 ~ 500mg/L, and ammonia nitrogen concentration is 20 ~ 30mg/L, and phosphorus concentration is 4 ~ 6 mg/L.
Example 2
The embodiment of the invention provides a municipal sewage treatment method, which comprises the following steps:
s21: providing initial activated sludge particles, and carrying out granulation culture on the initial activated sludge for 65 days by adopting municipal sewage to obtain 15.6g/L aerobic granular sludge. The method specifically comprises the following steps:
s211: culturing the initial activated sludge for 20 days by using municipal sewage, wherein the single period of the process is 4h, the water inflow is 10min, the aeration is 185-200min, the standing and sedimentation are 35-20min, and the water outflow is 10 min; the volume exchange rate is 40 percent, and 7.5g/L domesticated flocculent sludge is finally obtained.
S212: performing improved culture on the domesticated flocculent sludge for 20 days by using municipal sewage, wherein the single period of the process is 4h, wherein the water inflow is 10min, the aeration is 205-210min, the standing and the sedimentation are 10-15min, and the water outflow is 10 min; the volume exchange rate is 50 percent, and finally 11.2g/L of primary granular sludge is obtained.
S213: granulating and culturing the granular sludge precursor with municipal sewage for 25 days, wherein the single period of the process is 3h, water inflow is 10min, aeration is 150-155min, standing and settling are 10-5min, and water outflow is 10 min; the volume exchange rate is 60 percent, and 15.6g/L of aerobic granular sludge is finally obtained.
S22: and (4) leading the municipal sewage to a container containing the aerobic granular sludge obtained in the step S21, and performing purification treatment comprising aeration and sedimentation to obtain purified water. The purification treatment process comprises the following steps; the single period is 3h, wherein the water is fed for 10min, the aeration is carried out for 155min, and the standing and the sedimentation are carried out for less than 5 min; the volume exchange rate was 60%, and the operating parameters are shown in Table 2. The municipal sewage is treated by the aerobic granular sludge for 115 days.
Because of the municipal sewage quality of reality is unstable, in the municipal sewage of this embodiment, COD concentration is 400 ~ 500mg/L, and ammonia nitrogen concentration is 20 ~ 30mg/L, and phosphorus concentration is 4 ~ 6 mg/L.
Example 3
The embodiment of the invention provides a municipal sewage treatment method, which comprises the following steps:
s31: initial activated sludge granules are provided, and the initial activated sludge granules are cultured for 59 days by adopting municipal sewage to obtain 15.1g/L aerobic granular sludge. The method specifically comprises the following steps:
s311: culturing the initial activated sludge for 18 days by using municipal sewage, wherein the single period of the process is 4h, the water inflow is 10min, the aeration is 185-200min, the standing and sedimentation are 35-20min, and the water outflow is 10 min; the volume exchange rate is 38 percent, and 7g/L domesticated flocculent sludge is finally obtained.
S312: performing improved culture on the domesticated flocculent sludge for 18 days by using municipal sewage, wherein the single period of the process is 4 hours, wherein the water inflow time is 10min, the aeration time is 205-210min, the standing and sedimentation time is 10-15min, and the water outflow time is 10 min; the volume exchange rate is 48 percent, and finally 11g/L of primary granular sludge is obtained.
S313: granulating and culturing the granular sludge precursor for 23 days by using municipal sewage, wherein the single period of the process is 3h, the water inflow is 10min, the aeration is 150-155min, the standing and sedimentation are 10-5min, and the water outflow is 10 min; the volume exchange rate is 48 percent, and 15.1g/L of aerobic granular sludge is finally obtained.
S32: and (4) leading the municipal sewage to a container containing the aerobic granular sludge obtained in the step S31, and performing purification treatment comprising aeration and sedimentation to obtain purified water. The purification treatment process comprises the following steps; the single period is 3h, wherein the water is fed for 10min, the aeration is carried out for 155min, and the standing and the sedimentation are carried out for less than 5 min; the volume exchange rate was 48%, and the operating parameters are shown in Table 2. The municipal sewage is treated by the aerobic granular sludge for 121 days.
Because of the municipal sewage quality of reality is unstable, in the municipal sewage of this embodiment, COD concentration is 400 ~ 500mg/L, and ammonia nitrogen concentration is 20 ~ 30mg/L, and phosphorus concentration is 4 ~ 6 mg/L.
During the municipal sewage treatment methods of examples 1, 2 and 3, the change in the appearance of the sludge was observed as shown in FIG. 1. The added initial activated sludge (a) is activated sludge in a biological pool of a sewage plant, and has a loose structure and is flocculent. Along with the culture time, about 40 days, flocculent sludge is condensed into fine and irregular primary granular sludge (b), the formation and growth of granules are promoted by controlling and adjusting factors such as water inlet load, aeration quantity, sludge age, sludge settling time and the like, about 65 days, the primary granular sludge is gradually converted into aerobic granular sludge (c) which is full in shape, large in size, mature in performance and suitable for municipal sewage purification treatment, the mature aerobic granular sludge is ellipsoidal, clear in boundary, light yellow in color and about 3-5 mm in particle size. (d) For the scanning electron microscope image of the mature aerobic granular sludge, the granules are relatively regular, the surface of the granular sludge is provided with a plurality of small holes which are used as channels for exchanging with the outside, oxygen and nutrient substances necessary for the growth of microorganisms can be obtained through the small holes, and waste products of the growth metabolism can be discharged out of the granular sludge through the small holes.
Meanwhile, the COD concentration, ammonia nitrogen concentration and total phosphorus concentration of the municipal sewage during the municipal sewage treatment method of example 1, example 2 and example 3 were measured, and the results of the changes were analyzed as follows.
COD removal rate in municipal sewage
As shown in FIG. 2, the figure is a schematic diagram of the change of COD in the municipal sewage in the process of the municipal sewage treatment method of the embodiment of the invention. As can be seen from the figure, the COD concentration of the inlet water is kept basically stable within the range of 400-500 mg/L. When inoculation is started, the number of microorganisms is small, the pollutant treatment efficiency is low, along with the increase of the acclimatization time (about the first 20 days), the microorganisms gradually show good adaptability to the environment, the organic matter removal efficiency is also rapidly improved, the acclimatization process of the microorganisms is reflected, and the microorganisms can gradually adapt to high-concentration municipal sewage. In addition, as the sludge is gradually granulated, the effluent COD is gradually reduced. After running for 40d, especially running for about 65d, the COD of the purified effluent basically tends to be stable, and is kept below 20mg/L, and the removal efficiency is stabilized at more than 96%. The effluent COD can reach the first class A standard of pollutant discharge standard (GB 18918-2002) of urban sewage treatment plants.
Removal of ammonia nitrogen in municipal wastewater
As shown in FIG. 3, the figure is a schematic diagram of the change of the ammonia nitrogen concentration of the municipal sewage in the process of the municipal sewage treatment method of the embodiment of the invention. As can be seen from the figure, the ammonia nitrogen concentration in the municipal sewage before water inflow is 20-30mg/L, the average concentration is about 25mg/L, and the ammonia nitrogen concentration in the effluent water is kept at a lower level in the earlier stage of sludge granulation culture. And in addition to the sludge acclimation process of the first 20 days, the ammonia nitrogen concentration of the effluent is more than 3mg/L, and the ammonia nitrogen concentration of the effluent in the later period is gradually reduced. After about 65 days of operation, the ammonia nitrogen removal efficiency reaches over 95 percent and reaches 99 percent in most cases, and the ammonia nitrogen concentration of the purified effluent is less than 0.5 mg/L.
Removal of total phosphorus in municipal wastewater
FIG. 4 is a graph showing the change in the total phosphorus concentration of the municipal sewage during the municipal sewage treatment method according to the embodiment of the invention. In the initial stage of sludge granulation culture, the total phosphorus concentration of the municipal sewage is stably changed within the range of 4-6 mg/L, so that the sludge is adapted continuously, and the total phosphorus removal rate of the municipal sewage is about 80% after 20 days. With the continuous completion of the sludge granulation culture, when the aerobic granular sludge is formed, namely about 65 days of culture, the total phosphorus removal rate of the aerobic granular sludge on municipal sewage is stabilized to be more than 85 percent, and the total phosphorus concentration of the purified effluent is less than 0.9 mg/L.
The aerobic granular sludge has the structural characteristics and oxygen diffusion gradient, so that sludge granules form an aerobic zone, an anoxic zone and an anaerobic zone from outside to inside, and a proper growth environment is provided for phosphorus-removing microorganisms. Meanwhile, because the aerobic granular sludge can utilize phosphorus-accumulating bacteria to remove phosphorus, the DPB (denitrifying phosphorus-accumulating bacteria) in the inner anoxic zone of the aerobic granular sludge utilizes organic carbon source stored in the body to produce NO3-N as electron acceptor, degrading PHB while storing NO in vivo3Conversion of-N to N2While DPB is released, it absorbs phosphate in excess and is stored in the body to form polyphosphate. After the initial activated sludge granulation culture is completed in the embodiment, the phosphorus removal performance of the aerobic granular sludge is optimal.
In a word, the municipal sewage treatment method provided by the invention has high municipal sewage purification efficiency, the removal rate of COD (chemical oxygen demand) of the municipal sewage is stabilized above 96%, the removal rate of ammonia nitrogen can reach 99%, the removal rate of total phosphorus is stabilized above 85%, finally, the COD concentration in the purified water is less than 20mg/L, the concentration of ammonia nitrogen is less than 0.5mg/L, and the concentration of total phosphorus is less than 0.9 mg/L; the method has simple process, environmental protection and low cost, and has good practical significance and popularization and application value for promoting the rapid development of the sewage treatment technology in China.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A municipal sewage treatment method is characterized by comprising the following steps:
providing initial activated sludge, and performing granulation culture on the initial activated sludge by adopting municipal sewage for 59-71 days to obtain aerobic granular sludge of 15-16 g/L; the initial activated sludge granulation culture process comprises the following steps: carrying out first culture on the initial activated sludge for 18-22 days by using the municipal sewage to obtain 7-8g/L domesticated flocculent sludge; carrying out secondary culture on the domesticated flocculent sludge for 18-22 days by using the municipal sewage to obtain 11-12g/L granular sludge primary bodies; carrying out third culture on the primary granular sludge body by using the municipal sewage for 23-27 days to obtain 15-16g/L aerobic granular sludge; wherein the content of the first and second substances,
the first culturing process comprises a plurality of first culturing periods, and the first culturing period comprises a first water inlet step, a first aeration step, a first sedimentation step and a first water outlet step; wherein the first aeration treatment time is 185-200min, the first sedimentation treatment time is 20-35min, and the volume exchange rate of the first culture period is 38-42%;
the second culturing process comprises a plurality of second culturing periods, and the second culturing periods comprise second water inlet, second aeration, second sedimentation and second water outlet steps; wherein the second aeration treatment time is 205-210min, the second sedimentation treatment time is 10-15min, and the volume exchange rate of the second culture period is 48-52%;
the third culturing process comprises a plurality of third culturing periods, and the third culturing period comprises a third water inlet step, a third aeration step, a third sedimentation step and a third water outlet step; wherein the third aeration treatment time is 150-155min, the third sedimentation treatment time is 5-10min, and the volume exchange rate of the third culture period is 58-62%;
leading the municipal sewage to a container containing the aerobic granular sludge, and performing purification treatment comprising aeration and sedimentation to obtain purified water; the operating parameters of the purification treatment are as follows: pH is 6-8, apparent air velocity is more than 1.4cm/s, and sludge age is 10-15 days.
2. The municipal sewage treatment method according to claim 1, wherein the aeration time during the purification treatment is 150 to 155min, and the settling time is within 5 min; the volume exchange rate is 58-62%.
3. The municipal sewage treatment method according to any one of claims 1 to 2, wherein the municipal sewage has a COD concentration of 400 to 500mg/L, an ammonia nitrogen concentration of 20 to 30mg/L and a phosphorus concentration of 4 to 6 mg/L.
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| JP2009018263A (en) * | 2007-07-12 | 2009-01-29 | Sumitomo Heavy Ind Ltd | Batchwise waste water treatment method |
| CN101962222A (en) * | 2010-11-15 | 2011-02-02 | 中国人民解放军军事医学科学院卫生学环境医学研究所 | Method for fast aerobic granulation of flocculent sludge in sequence batch reactor |
| CN103896393A (en) * | 2014-01-17 | 2014-07-02 | 复旦大学 | Method for cultivating high strength aerobic granular sludge |
| CN104628128A (en) * | 2014-12-26 | 2015-05-20 | 浙江大学 | Sludge-water separate discharging method for strengthening stable operation of aerobic granular sludge process |
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