CN115477390B - Process for treating garbage leachate by combining biological treatment and membrane assembly - Google Patents
Process for treating garbage leachate by combining biological treatment and membrane assembly Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a technology for treating landfill leachate by combining biological treatment and a membrane component, which belongs to the technical field of landfill leachate treatment, and the technology comprises the steps of adopting MBR biological membrane treatment after two-stage nitrification-denitrification, adopting indirect aeration in the MBR treatment process, and controlling the time of A/O (anaerobic/anoxic/oxic) to continuously generate nitrification-denitrification and shortcut nitrification in an MBR system, so that the total nitrogen in the landfill leachate is effectively reduced, and the influence of insufficient carbon quantity in the existing landfill leachate on denitrification is solved; the invention adopts the intermittent aeration type MBR treatment process, and can fully reduce the total nitrogen content in the landfill leachate by controlling the process conditions.
Description
Technical Field
The invention belongs to the technical field of landfill leachate treatment, and particularly relates to a technology for treating landfill leachate by combining biological treatment and a membrane module.
Background
The Membrane Bioreactor (MBR) process is a biochemical treatment process commonly adopted by percolate treatment projects in China. The MBR system is composed of a biochemical reaction system and a membrane separation system, compared with the traditional activated sludge method, the MBR system replaces a secondary sedimentation tank through a membrane separation technology, saves occupied space, and intercepts all functional bacteria, suspended substances and colloid, so that the concentration of microorganisms in the reactor is maintained at a higher level, the volume load of the reactor is greatly improved, and the occupied space requirement of the reactor is greatly reduced. In addition, the secondary sedimentation tank is replaced by the mud-water separation effect of the ultrafiltration membrane, so that the technology is not limited by elevation any more, and the tank type design is relatively free. The leachate treatment project of the landfill in China is mostly located in a valley region with a small area, and the MBR technology is widely applied to the leachate treatment project due to the advantages of occupation and arrangement. According to the requirements of the discharge standard of the water quality characteristics of the percolate in China, the removal rate of various pollutants is required to be more than 95%, so that the biochemical treatment is not realized. The dense membrane treatment technology is selected from the existing water treatment technologies, and is a treatment technology and a guarantee measure which have relatively low treatment cost, relatively reliable technology and strong operability and can ensure the quality of the effluent. Thus, many domestic RO or NF technologies are employed to deeply treat the permeate. However, the content of ammonia nitrogen in the landfill leachate is higher, and the total nitrogen content is still higher only by mainly eliminating ammonium nitrogen and nitrate nitrogen through digestion and denitrification. Most of the existing landfill sites are anaerobic environments, most of organic matters are removed in the landfill waste bioreactor through leachate recharging, so that the carbon content of leachate is low, the requirement of a carbon source can not be met in the denitrification process, and the denitrification efficiency is greatly reduced.
Disclosure of Invention
In order to overcome the problems in the background art, the invention provides a technology for treating landfill leachate by combining biological treatment and a membrane module, which can fully reduce the total nitrogen content in the landfill leachate by adopting an intermittent aeration type MBR treatment process and controlling the process conditions.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the technology for treating the landfill leachate by combining biological treatment and a membrane assembly comprises the following steps of:
(1) And (5) primary nitration.
(2) And (3) primary denitrification.
(3) And (3) secondary nitrification.
(4) And (3) secondary denitrification.
(5) The intermittent aeration type MBR treatment process utilizes alternating anoxic/aerobic conditions in time to achieve synchronous removal of COD and TN.
Furthermore, in the intermittent aeration type MBR treatment, jet aeration is used for aeration, the aeration quantity is 80-120L/h, and the steam-water volume ratio during aeration is 3.8-4.2:1.
Further, in the step (5), the interval time between intermittent hypoxia and aerobic is 1h/2h.
Further, the oxygen demand in step (5) is:
Q s ＝K o O 2
wherein:
wherein: q (Q) s : oxygen demand of sewage in a standard state, kg/d;
K o : oxygen demand correction coefficient;
O 2 : designing the oxygen demand of sewage, kg/d;
C s : the mass concentration of saturated dissolved oxygen in clear water is mg/L in a standard state, and 9.17 is taken;
alpha: the ratio of the total oxygen transfer coefficient in the percolate to the total oxygen transfer coefficient in the clean water is 0.8-0.85;
beta: the ratio of the saturated dissolved oxygen concentration of the percolate to the saturated dissolved oxygen concentration of the clean water is 0.9-0.97;
C sw : t/. Degree.C, when the pressure is actually calculated, the surface of the clear liquid is saturated with dissolved oxygen, mg/L;
C 0 : the residual dissolved oxygen of the mixed solution is mg/L, and generally 2 is taken;
t: designing water temperature and DEG C;
C sm : T/DEGC, when the pressure is actually calculated, the average dissolution value in the clear water from the depth of the water where the aeration device is positioned to the pool surface, mg/L;
qt: oxygen in the gas escaping from the aeration tank,%;
E A : the oxygen utilization rate of the aeration equipment is percent, the conventional value is 20-25 percent, and if jet aeration is adopted, the value is 0.3-0.35 when the aeration depth is about 8 m.
The invention has the beneficial effects that:
according to the invention, a process of combining nitrification and denitrification with MBR biological membrane treatment is adopted, and for nitrifying and denitrifying microorganisms with longer time period, the intermittent aeration type MBR treatment is adopted, so that nitrification and denitrification occur in the MBR treatment process, and as ultrafiltration completely intercepts microorganisms, the sludge age of the microorganisms reaches and far exceeds the time required by the growth of nitrifying microorganisms, and nitrifying microorganism concentration required by complete nitrification can be propagated and aggregated, so that ammonia nitrogen in wastewater can be completely nitrified. Also the prolongation of the sludge age and the high concentration of microorganisms greatly improve the removal of organic pollutants.
The invention combines the MBR process with the short-cut nitrification-denitrification mechanism to exert respective advantages through intermittent aeration type MBR treatment. The main body in the MBR reactor is nitrification-denitrification, the local area is short-cut nitrification-denitrification, and after the short-cut nitrification system is started, the influence of low C/N on the denitrification rate of the landfill leachate is solved by adjusting the parameters (aeration amount and A/O) of the intermittent aeration MBR system.
Drawings
FIG. 1 is a graph showing the influence of A/O time control on COD removal rate in example 1 of the present invention;
FIG. 2 is a graph showing the influence of A/O time control on TN and ammonia nitrogen in example 1 of the present invention;
FIG. 3 is a graph showing the second influence of A/O time control on TN and ammonia nitrogen in example 1 of the present invention;
FIG. 4 shows the change in DO and nitrogen morphology at A/O=1h/2h in example 1 of the present invention;
FIG. 5 is a graph showing the effect of aeration on COD, NH3-N and TN removal efficiency in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, the technical solutions of the present invention will be described in detail below, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, those skilled in the art may obtain other embodiments without making any creative effort, which fall within the protection scope of the present invention.
Example 1
The technology for treating the landfill leachate by combining biological treatment and a membrane assembly comprises the following steps of:
(1) And (5) primary nitration.
(2) And (3) primary denitrification.
(3) And (3) secondary nitrification.
(4) And (3) secondary denitrification.
(5) The intermittent aeration type MBR treatment process utilizes alternating anoxic/aerobic conditions in time to achieve synchronous removal of COD and TN.
The oxygen demand of the step (5) is as follows: q (Q) s ＝K o O 2
Wherein:
wherein: q (Q) s : oxygen demand of sewage in a standard state, kg/d;
K o : oxygen demand correction coefficient;
O 2 : designing the oxygen demand of sewage, kg/d;
C s : the mass concentration of saturated dissolved oxygen in clear water is mg/L in a standard state, and 9.17 is taken;
alpha: the ratio of the total oxygen transfer coefficient in the percolate to the total oxygen transfer coefficient in the clean water is 0.8-0.85;
beta: the ratio of the saturated dissolved oxygen concentration of the percolate to the saturated dissolved oxygen concentration of the clean water is 0.9-0.97;
C sw : when the temperature is T ℃ and the pressure is actually calculated, the surface of the clear liquid is saturated with dissolved oxygen, mg/L;
C 0 : the residual dissolved oxygen of the mixed solution is mg/L, and generally 2 is taken;
t: designing water temperature and DEG C;
C sm : when the temperature T and the actual pressure are calculated, the average dissolution value in the clear water from the depth of the water of the aeration device to the pool surface is mg/L;
qt: oxygen in the gas escaping from the aeration tank,%;
E A : the oxygen utilization rate of the aeration equipment is percent, the conventional value is 20-25 percent, and if jet aeration is adopted, the value is 0.3-0.35 when the aeration depth is about 8 m.
In the above steps, the steps (1) to (4) are conventional control steps, and in this embodiment, the garbage percolate after the two-stage nitrification and denitrification treatment enters an intermittent aeration type MBR treatment system for treatment, which is not described in detail.
The method of the invention combines the MBR process with the short-cut nitrification-denitrification mechanism to exert respective advantages. The main body in the biochemical reactor is nitrification-denitrification, the local area is short-cut nitrification-denitrification, and after the short-cut nitrification system is started, the aeration quantity and the A/O control time of the intermittent aeration MBR are adjusted to examine the denitrification characteristic of the intermittent aeration MBR on low C/N sewage, and the steam-water volume ratio of the jet aerator is approximately equal to 4:1.
Obtaining the influence of A/O time control on COD removal rate (figure 1) and the influence of A/O time control on effluent TN and ammonia nitrogen (figures 2 and 3);
as can be seen from fig. 1 to fig. 3, along with the continuous reduction of the aeration time in different periods and the extension of the anaerobic lack time, the removal of COD by the system shows a decline situation, from about 90% to about 75% of A/O=2h/1 h during continuous aeration; the ammonia nitrogen removal of the system is always maintained to be more than 85%; the removal rate of total nitrogen is relatively low, and the removal rate of A/O=1h/2 h has the best effect, which reaches about 61 percent. The method shows that the activity of nitrifying bacteria in the system is strong, and denitrification becomes a limiting step of denitrification efficiency.
With a/o=1 h/2h, the changes in DO and nitrogen morphology are shown in fig. 4. As can be seen from fig. 4, after the system stops aeration, the concentrations of NO 2-N and NO 3-N are synchronously reduced, and the concentration of NO 2-N is reduced more quickly, which proves that NO 2-N is easier to be denitrified by denitrifying bacteria as a substrate in the system, and the superiority of the short-cut nitrification-denitrification system is also laterally demonstrated.
When the aeration rate is 100L/h, the A/O=2h/1 h, the TN removal effect is better, but under the working condition, the average DO is lower, the system is in a shortage/anaerobic state for a longer time in a period, so the removal rate of COD and NH3-N by the system is lower, and the removal efficiency of COD, NH3-N and TN is observed by properly increasing the aeration rate when the A/O=2h/1 h.
The A/O is controlled at 2h/1h, the aeration amount is 140L/h and 160L/h, and the removal efficiency of the system on COD, NH3-N and TN is analyzed under the working conditions. A comparison of the removal efficiency of the system for COD, NH3-N and TN under three different aeration conditions is obtained (see figure 5).
According to comparison observation, the change of the aeration quantity increasing system on the removal rate of COD and TN is not obvious, the average removal rate of COD is 81% and the average removal rate of TN is 85%, the average removal rate of TN is 60% and the average removal rate of TN is 55%, the removal rate of NH3-N by the system is obviously increased, and when the aeration quantity is increased to 160L/h, the removal rate of NH3-N by the system is increased to 93%.
Compared with the traditional continuous flow activated sludge method, the intermittent aeration type MBR treatment process has the following advantages:
(1) because the anoxic reaction and the aerobic reaction are completed in the same reactor, the construction cost of the anoxic tank part in the traditional process can be reduced;
(2) because of adopting the intermittent aeration mode, the power consumption in the running process can be reduced to a certain extent;
(3) the intermittent aeration type reactor has better denitrification efficiency as part of the traditional process, and can overcome the problem of low denitrification efficiency caused by insufficient carbon source to a certain extent because the COD of the influent water is continuously supplemented with the carbon source required by denitrification when the oxygen deficiency is caused under the continuous flow condition;
(4) in the anoxic section of intermittent aeration operation, microorganisms mainly depend on low molecular oxygen released by nitrate to perform respiration, and the oxidation-reduction potential of an inorganic electron acceptor is higher than that of oxygen, so that ATP released in anaerobic respiration is less, the yield of bacteria is lower, the residual sludge amount is also lower, and the sludge disposal cost of municipal sewage plants can be reduced.
Most of landfill sites are anaerobic environments, most of organic matters are removed in landfill waste bioreactors through leachate recharging, so that leachate is low, the requirement of a carbon source can not be met in the denitrification process, and the denitrification efficiency is greatly reduced. The intermittent aeration type MBR process can realize the purpose of efficiently removing ammonia nitrogen, is particularly suitable for treating wastewater with high ammonia nitrogen and low carbon nitrogen ratio, and has good application value and prospect.
The intermittent aeration MBR system is characterized in that the processes of nitrification and denitrification are controlled by adjusting A/O, the aeration time and intensity are insufficient to influence the nitrification process of the system, so that denitrifying bacteria cannot obtain enough matrixes to perform denitrification, and anoxic stirring is used for enabling the denitrifying bacteria to perform denitrification by utilizing products of the nitrification process to finally realize TN removal.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (1)
1. The process for treating the landfill leachate by combining biological treatment and membrane assembly is characterized by comprising the following steps of:
(1) Primary nitration;
(2) Primary denitrification;
(3) Secondary nitration;
(4) Secondary denitrification;
(5) An intermittent aeration type MBR treatment process utilizes alternating anoxic/aerobic conditions in time to achieve synchronous removal of COD and TN;
during the intermittent aeration type MBR treatment, jet aeration is used for aeration, the aeration quantity is 80-120L/h, and the steam-water volume ratio during aeration is 3.8-4.2:1; the anoxic/aerobic interval time is 1h/2h;
the oxygen demand is:
Q s ＝K o O 2
wherein:
wherein: q (Q) s : oxygen demand of sewage in a standard state, kg/d;
K o : oxygen demand correction coefficient;
O 2 : designing the oxygen demand of sewage, kg/d;
C s : the mass concentration of saturated dissolved oxygen in clear water is mg/L in a standard state, and 9.17 is taken;
alpha: the ratio of the total oxygen transfer coefficient in the percolate to the total oxygen transfer coefficient in the clean water is 0.8-0.85;
beta: the ratio of the saturated dissolved oxygen concentration of the percolate to the saturated dissolved oxygen concentration of the clean water is 0.9-0.97;
C sw : t/. Degree.C, actual meterWhen the pressure is calculated, the surface of the clear liquid is saturated with dissolved oxygen, mg/L;
C 0 : taking 2 mg/L of residual dissolved oxygen in the mixed solution;
t: designing water temperature and DEG C;
C sm : T/DEGC, when the pressure is actually calculated, the average dissolution value in the clear water from the depth of the water where the aeration device is positioned to the pool surface, mg/L;
qt: oxygen in the gas escaping from the aeration tank,%;
E A : the oxygen utilization rate of the aeration equipment is percent, the conventional value is 20-25 percent, and if jet aeration is adopted, the value is 0.3-0.35 when the aeration depth is 8 m.
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| CN109188899A (en) * | 2018-11-16 | 2019-01-11 | 湖北龙源电力科技有限公司 | Accurate aeration control system and fuzzy control method for sewage treatment blurring |
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