CN112250177B - Device and method for realizing efficient denitrification of landfill leachate by utilizing shortcut nitrification-anaerobic ammonia oxidation - Google Patents
Device and method for realizing efficient denitrification of landfill leachate by utilizing shortcut nitrification-anaerobic ammonia oxidation Download PDFInfo
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A device and a method for realizing high-efficiency denitrification of landfill leachate by utilizing shortcut nitrification-anaerobic ammonia oxidation adopt an anoxic-aerobic alternation strategy to inhibit Nitrobacteria (NOB) in sewage so as to realize high-efficiency denitrification, and belong to the field of sewage treatment. This device comprises former water tank, SBR reactor, sedimentation tank, mixing water tank, improvement UASB reactor and mud recovery pond, wherein adds the agitator in the improvement UASB reactor, and the cotton that absorbs water is added to delivery port triangle weir, sets up the two-stage sedimentation tank in addition above the reactor, further prevents that mud from losing. For shortcut nitrification-anaerobic ammonia oxidation, the inhibition of NOB activity is very important, a stable shortcut effect is obtained by monitoring and adjusting process parameters in real time, nitrite is stably provided, and the whole system reaches a stable running state. The method is simple to operate, can be quickly started and stably maintained, and realizes the high-efficiency denitrification of the landfill leachate by utilizing the shortcut nitrification-anaerobic ammonia oxidation process.
Description
Technical Field
The invention relates to a device and a method for realizing short-cut nitrification and efficient denitrification of landfill leachate by coupling anaerobic ammonia oxidation by inhibiting nitrifying bacteria (NOB) in sewage by adopting an anoxic-aerobic alternative strategy, and belongs to the field of sewage treatment.
Background
With the continuous progress and development of society, people are gradually aware of the importance of environmental protection. In recent years, china has come out and issued a series of policies and requirements for environmental protection, and particularly for water pollution, the detection frequency, detection indexes, effluent quality and standard-reaching requirements are further strictly specified. The traditional biological sewage treatment process has the advantages of high energy consumption, large investment, high sludge yield and general treatment effect, and is difficult to meet new standards and requirements.
The shortcut nitrification technology and the anaerobic ammonia oxidation technology are novel sewage biological treatment technologies which are developed more rapidly in recent years, and have larger application value and wide development prospect. The short-cut nitrification technology is characterized in that ammonia nitrogen in sewage is converted into nitrite nitrogen under the action of nitrite bacteria (AOB) under the aerobic condition, the reaction is stopped at the moment, and the nitrite nitrogen is not converted into nitrate nitrogen continuously. The technology has many advantages, such as saving aeration quantity, saving energy, little mud production and the like. The anammox technology is a process in which anammox bacteria simultaneously convert ammonia nitrogen and nitrite nitrogen existing in sewage into nitrogen under an anoxic condition. The anaerobic ammonium oxidation technology has the advantages of carbon source saving, cost saving, small sludge production and the like. At present, researchers often combine the two technologies, and a typical process is a shortcut nitrification-anaerobic ammonia oxidation process.
The continuous flow shortcut nitrification-anaerobic ammonia oxidation process combines the advantages of the shortcut nitrification technology and the anaerobic ammonia oxidation technology, not only saves carbon source and energy consumption and has less sludge yield, but also has better treatment effect and can reach increasingly strict effluent standard. However, the continuous flow shortcut nitrification-anammox process also has significant difficulties, the two most difficult points of which are the realization of the shortcut nitrification reaction and the effective retention of anammox bacteria.
The foundation for realizing the short-cut nitrification reaction is to inhibit the activity and growth of nitrifying bacteria (NOB) and enable nitrosobacteria (AOB) to grow preferentially, and the current common methods are as follows: (1) continuous hypoxia aeration; (2) maintaining a higher reaction temperature; (3) inhibition by FA and FNA, etc. However, these methods have certain limitations: (1) The reaction rate is slowed down due to low dissolved oxygen, the treatment efficiency is not high, and the sludge is easy to expand; (2) The water amount of the urban sewage treatment plant is large, and the heating strategy is neither economical nor practical; (3) the study shows that FA and FNA inhibition is adaptive.
According to the reports of related documents, hydroxylamine has good selective inhibition, and the hydroxylamine with a certain concentration can well promote the growth of nitrosobacteria (AOB) and inhibit the activity of Nitrobacteria (NOB) to inhibit the growth of the nitrobacteria. Meanwhile, hydroxylamine is used as an intermediate product of the nitration reaction, can be well utilized, does not introduce new pollutants, and is low in price, economical and easy to obtain. Whilst the lack of aerobic alternation is considered to be an effective means of inhibiting the activity of NOB, because after being subjected to anoxic treatment, NOB has a longer lag phase and recovery phase than AOB, making its growth in the system at a disadvantage, gradually elutriated, and thus favouring the growth of AOB.
The method adopts a means of alternately inhibiting NOB in an anoxic state and is matched with an improved UASB reactor to effectively retain anammox bacteria so as to achieve the aim of realizing and stably maintaining the short-cut nitrification and anammox reaction, is a green process which accords with the sustainable development strategy of China, and has higher potential application value and practical significance.
Disclosure of Invention
The invention discloses a landfill leachate shortcut nitrification anaerobic ammonia oxidation process, which saves aeration amount and carbon source, has low sludge yield and high denitrification efficiency, but the stable maintenance of shortcut nitrification is a peak which is difficult to break through.
The utility model provides a device for realizing landfill leachate high-efficient denitrogenation based on lack good oxygen is alternative to realize short distance nitration-anaerobic ammonium oxidation which characterized in that: the device consists of a landfill leachate raw water tank, a landfill leachate short-cut nitrification reactor, a sedimentation tank, a mixed water tank, a landfill leachate anaerobic ammonia oxidation reactor, a sludge recovery tank and a sludge reflux device;
a water inlet pipe is arranged on the raw water tank of the landfill leachate;
the garbage leachate shortcut nitrification reactor is provided with a water inlet, a water outlet, a backflow port, a pH meter, a DO probe, an aeration pump and an aeration disc;
the sedimentation tank is provided with a water inlet, a water outlet pipe and a sludge discharge pipe, wherein the water inlet is connected with a water outlet of the leachate short-cut nitrification reactor, and the sludge discharge pipe is provided with a sludge discharge valve and a reflux valve;
the mixed water tank is provided with a water inlet and a water outlet, wherein the water inlet is connected with the water outlet of the sedimentation tank, and the water outlet is connected with the water inlet of the landfill leachate anaerobic ammonia oxidation reactor through a water inlet pump;
the landfill leachate anaerobic ammonia oxidation reactor is provided with a water inlet, a water outlet, a water bath circulating device, a three-phase separator, a primary sedimentation tank, a secondary sedimentation tank, a stirrer, a sampling port and a sludge recovery port, wherein the water inlet is connected with a water inlet pump of a mixed water tank; the sludge in the sludge recovery tank flows back to the landfill leachate anaerobic ammonia oxidation reactor through a sludge discharge pump;
the sludge reflux device consists of a reflux valve and a reflux pump;
the invention provides a method for realizing efficient denitrification and cooperative reduction of landfill leachate based on anoxic-aerobic alternative short-cut nitrification-anaerobic ammonia oxidation, which comprises the following steps of:
the method comprises the following steps that sewage in a raw garbage leachate tank enters a garbage leachate shortcut nitrification reactor through a water inlet pump, a stirring device is started to operate for 150min in an anaerobic mode after water is fed, an aeration device is started again, dissolved oxygen is controlled to be 0.5-1 mg/L, the pH value is monitored on line, and sodium bicarbonate is added when the pH value is smaller than 7 and is adjusted to be 7.8; the operation period is water inflow for 10min, anaerobic operation for 150min, aeration for 150-210 min, precipitation for 30min, water drainage for 10min, and standing for 10min;
the periodic sludge backflow operation comprises the following steps: during the idle period of the garbage leachate shortcut nitrification reactor, returning sludge in a sedimentation tank into the garbage leachate shortcut nitrification reactor through a sludge return pump, wherein the sludge return period is 4 times/9 d, the sludge return amount is 0.06V-0.15V of the water inlet volume (V), and the sludge concentration in the system is measured every six days, so that the sludge concentration in the garbage leachate shortcut nitrification reactor is maintained at 3500-4500 mg/L;
the drainage operation is that the landfill leachate short-cut nitrification reactor discharges a mud-water mixture to a sedimentation tank through a water outlet, and sewage is discharged to a mixed water tank after mud-water separation in the sedimentation tank;
and (5) finishing the single-period operation, and repeating the steps for operation.
The operation steps of the landfill leachate anaerobic ammonia oxidation reactor are as follows:
raw garbage leachate is fed into the mixing water tank, mixed with the effluent of the short-cut nitrification reactor of the garbage leachate, and then added with sodium bicarbonate to adjust the pH value to 7.3;
then the wastewater enters the anaerobic ammoxidation reactor for landfill leachate through a water inlet pump, and water is continuously fed for 24 hours; controlling the retention time of water power to be 4-12 hours by controlling the flow rate of a water inlet pump; the temperature in the landfill leachate anaerobic ammonia oxidation reactor is maintained at 30-32 ℃ by controlling the temperature of the water bath circulating device;
stirring continuously for 24 hours, and controlling the stirring speed at 60-80r/min; in a secondary sedimentation tank above the landfill leachate anaerobic ammonia oxidation reactor, returning sludge in a sludge recovery tank into the landfill leachate anaerobic ammonia oxidation reactor through a sludge return pump, wherein the sludge return period is 1 time/7 d, the sludge return amount is all sludge in the sedimentation tank, measuring the sludge concentration in the landfill leachate anaerobic ammonia oxidation reactor once every two weeks, and maintaining the sludge concentration in the landfill leachate anaerobic ammonia oxidation reactor at 2500-3500 mg/L;
and replacing the water absorption cotton in the triangular weir crest and the water outlet of the landfill leachate anaerobic ammonia oxidation reactor every two weeks.
The technical principle of the method of the invention is as follows: on one hand, the inhibition effect of high-concentration FA in landfill leachate on NOB is larger than that of AOB, on the other hand, the affinity of AOB on oxygen is larger than that of NOB, so that under the condition of less aerobic alternation, the competition capability of AOB on oxygen is larger than that of NOB, and by combining FA and less aerobic alternation, the inhibition on NOB can be effectively realized, and the elutriation of NOB is realized. And then the ammonia nitrogen nitrite nitrogen in the mixed water tank enters an anaerobic ammonia oxidation reactor to carry out anaerobic ammonia oxidation reaction, thereby realizing the high-efficiency denitrification of the landfill leachate mainly based on anaerobic ammonia oxidation and leading the whole system to reach a stable operation state.
Compared with the prior art, the device and the method for realizing the high-efficiency denitrification of the landfill leachate by utilizing the shortcut nitrification-anaerobic ammonia oxidation have the following advantages that:
the landfill leachate shortcut nitrification reactor inhibits NOB through the combination of FA and anoxic-aerobic alternation, so that the AOB activity in the reactor is always greater than NOB, and a stable nitrite source is provided for a rear anaerobic ammonia oxidation reactor;
according to the method, the UASB anaerobic ammonia oxidation reactor is improved, the internal stirrer is used for enabling the reaction to be more sufficient, the water-absorbing cotton is added to the triangular weir at the water outlet, the siphon principle is used for draining water, the problem of sludge loss can be well solved, and meanwhile, the UASB anaerobic ammonia oxidation reactor is improved into a sedimentation tank above the UASB reactor, so that the sludge loss is further prevented. And by combining the strategy of anoxic-aerobic alternate operation of the SBR reactor, the activity of NOB is inhibited, nitrite is stably provided, and the whole system reaches a stable operation state.
The method has the advantages of short-cut nitrification anaerobic ammonia oxidation, aeration quantity saving, carbon source saving, high denitrification efficiency, low sludge yield and low operation cost, is simple to operate, can be quickly started and stably maintained, is convenient to operate and manage, and is suitable for engineering.
Drawings
FIG. 1 is a process flow diagram of an apparatus and method for implementing high-efficiency denitrification of landfill leachate by using shortcut nitrification-anaerobic ammonia oxidation in accordance with the present invention;
with reference to the description of fig. 1, 1 — raw water tank for landfill leachate; 2-landfill leachate short-cut nitrification reactor; 3-a sedimentation tank; 4-mixing the water tank; 5-anaerobic ammoxidation reactor for landfill leachate; 6-a sludge recovery tank; 7, a water inlet pump I; 8, an aeration pump; 9-pH meter; 10, a first stirrer; 11-DO probe; 12-an aeration disc; 13-sludge reflux pump II; 14-a water inlet pump II; 15-a second stirrer; 16-water bath circulation device; 17-a first water outlet; 18-sampling port one; 19-sample port two; 20, recycling the sludge at the first port; 21-sludge recycling port two; 22-water outlet II; 23-water outlet III; 24-a three-phase separator; 25-sampling port three; 26-a sludge recovery pump I; 27-a first-stage sedimentation tank; 28-a secondary sedimentation tank;
Detailed Description
The utility model provides a device for realizing landfill leachate high efficiency denitrification based on lack good oxygen is in turn realized short distance nitration-anaerobic ammonium oxidation, its characterized in that: the device comprises a landfill leachate raw water tank (1), a landfill leachate short-cut nitrification reactor (2), a sedimentation tank (3), a mixed water tank (4), a landfill leachate anaerobic ammonia oxidation reactor (5), a sludge recovery tank (6) and a sludge reflux device;
a water inlet pipe is arranged on the raw water tank (1) of the landfill leachate;
the landfill leachate short-cut nitrification reactor (2) is provided with a water inlet, a water outlet I (17), a return port, a pH meter (9), a DO probe (11), an aeration pump (8), a stirrer I (10) and an aeration disc (12);
the sedimentation tank (3) is provided with a water inlet, a water outlet pipe and a sludge discharge pipe, wherein the water inlet is connected with a first water outlet (17) of the leachate short-cut nitrification reactor (2), and the sludge discharge pipe is provided with a sludge discharge valve and a reflux valve;
the mixed water tank (4) is provided with a water inlet and a water outlet, wherein the water inlet is connected with the water outlet of the sedimentation tank, and the water outlet is connected with the water inlet of the landfill leachate anaerobic ammonia oxidation reactor (5) through a water inlet pump II (14);
the landfill leachate anaerobic ammonia oxidation reactor (5) is provided with a water inlet, a water outlet III (23), a water bath circulating device (16), a three-phase separator (24), a primary sedimentation tank (27), a secondary sedimentation tank (28), a stirrer (15), a sampling port I (18) and a sludge recovery port II (21), wherein the water inlet is connected with a water inlet pump of the mixed water tank (4); the sludge in the sludge recovery tank (6) flows back to the landfill leachate anaerobic ammonia oxidation reactor (5) through a sludge recovery pump I (26);
the sludge reflux device consists of a reflux valve and a reflux pump;
the specific conditions of the inlet water quality during the experiment are as follows:
water quality characteristics of garbage percolate
During the operation of the device, the specific operation and control are as follows:
sewage in a raw water tank (1) of the landfill leachate enters a short-range nitrification reactor (2) of the landfill leachate through a water inlet pump I (7), a stirring device is started to operate for 150min in an anaerobic mode after water is fed, an aeration device is started, dissolved oxygen is controlled to be 0.5-1 mg/L, the pH is monitored on line, and when the pH is smaller than 7, sodium bicarbonate is added to adjust the pH to 7.8; the operation period is water inlet for 10min, anaerobic operation for 150min, aeration for 150-210 min, precipitation for 30min, water drainage for 10min, and standing for 10min;
the periodic sludge reflux operation comprises the following steps: when the garbage leachate short-cut nitrification reactor is idle, the sludge in the sedimentation tank (3) is refluxed into the garbage leachate short-cut nitrification reactor (2) through a second sludge reflux pump (13), the reflux period of the sludge is 4 times/9 d, the reflux amount of the sludge is 0.06V-0.15V of the water inlet volume (V), the sludge concentration in the system is measured every six days, and the sludge concentration in the garbage leachate short-cut nitrification reactor (2) is maintained to be 3500-4500 mg/L;
the drainage operation is that the landfill leachate short-cut nitrification reactor (2) discharges a mud-water mixture to the sedimentation tank (3) through the first water outlet (17), and sewage is discharged to the mixed water tank (4) after mud-water separation in the sedimentation tank; and (5) finishing the single-period operation, and repeating the steps for operation.
The operation steps of the landfill leachate anaerobic ammonia oxidation reactor are as follows:
raw water of the landfill leachate is fed into the mixed water tank (4), and is mixed with the effluent of the short-cut nitrification reactor of the landfill leachate, and then the pH value is adjusted to 7.3 by adding sodium bicarbonate;
then enters the anaerobic ammonia oxidation reactor of the landfill leachate through a second water inlet pump (14) and continuously feeds water for 24 hours; controlling the flow rate of a second water inlet pump (14) to control the hydraulic retention time to be 4-12 hours; the temperature in the landfill leachate anaerobic ammonia oxidation reactor is maintained at 30-32 ℃ by controlling the temperature of the water bath circulating device (16);
stirring continuously for 24 hours, and controlling the stirring speed at 60-80r/min; in a secondary sedimentation tank (28) above the landfill leachate anaerobic ammonia oxidation reactor, returning sludge in a sludge recovery tank into the landfill leachate anaerobic ammonia oxidation reactor (5) through a sludge return pump I (26), wherein the sludge return period is 1 time/7 d, the sludge return amount is all sludge in the sedimentation tank, the sludge concentration in the landfill leachate anaerobic ammonia oxidation reactor is measured once every two weeks, and the sludge concentration in the landfill leachate anaerobic ammonia oxidation reactor is maintained at 2500-3500 mg/L;
and replacing the water absorption cotton in the triangular weir crest and the water outlet of the landfill leachate anaerobic ammonia oxidation reactor every two weeks.
The foregoing is a detailed embodiment of the present invention to facilitate better understanding and application of the present invention by those skilled in the art, and the present invention is not limited thereto, so that modifications and improvements made thereto by those skilled in the art are within the scope of the present invention.
Claims (2)
1. The utility model provides an utilize shortcut nitrification-anaerobic ammonium oxidation to realize device of high-efficient denitrogenation of landfill leachate which characterized in that: comprises a landfill leachate raw water tank (1), a landfill leachate short-cut nitrification reactor (2), a sedimentation tank (3), a mixed water tank (4), a landfill leachate anaerobic ammonia oxidation reactor (5), a sludge recovery tank (6) and a sludge reflux device;
wherein the raw water tank (1) of the landfill leachate is provided with a water inlet pipe;
wherein the landfill leachate short-cut nitrification reactor (2) is provided with a water inlet, a water outlet I (17), a return port, a pH meter (9), a DO probe (11), an aeration pump (8) and an aeration disc (12);
wherein the sedimentation tank (3) is provided with a water inlet, a water outlet pipe and a sludge discharge pipe, wherein the water inlet is connected with a first water outlet (17) of the percolate short-cut nitrification reactor (2), and the sludge discharge pipe is provided with a sludge discharge valve and a reflux valve;
the mixed water tank (4) is provided with a water inlet and a water outlet, wherein the water inlet is connected with the water outlet of the sedimentation tank, and the water outlet is connected with the water inlet of the landfill leachate anaerobic ammonia oxidation reactor (5) through a water inlet pump II (14);
the anaerobic ammoxidation reactor (5) for the landfill leachate is provided with a water inlet, a water outlet III (23), a water bath circulating device (16), a three-phase separator (24), a primary sedimentation tank (27), a secondary sedimentation tank (28), a stirrer II (15), a sampling port I (18) and a sludge recovery port II (21), wherein the water inlet is connected with a water inlet pump of the mixed water tank (4); the sludge in the sludge recovery tank (6) flows back into the landfill leachate anaerobic ammonia oxidation reactor (5) through a sludge return pump I (26); wherein the sludge reflux device consists of a reflux valve and a reflux pump.
2. The method for realizing the high-efficiency denitrification of the landfill leachate by utilizing the device of claim 1 and utilizing the shortcut nitrification-anaerobic ammonia oxidation is characterized by comprising the following steps:
the periodic operation steps of the landfill leachate shortcut nitrification reactor are as follows:
1) Sewage in a raw water tank (1) of the landfill leachate enters a short-cut nitrification reactor (2) of the landfill leachate through a water inlet pump I (7), a stirring device is started to operate for 150min in an anaerobic mode after water is fed, an aeration device is started again, dissolved oxygen is controlled to be 0.5-1 mg/L, pH is monitored on line, and when the pH is smaller than 7, sodium bicarbonate is added to supplement alkalinity, and the pH is supplemented to 7.8; the operation period is water inlet for 10min, anaerobic operation for 150min, aeration for 150-210 min, precipitation for 30min, water drainage for 10min, and standing for 10min;
2) The periodic sludge reflux operation comprises the following steps: during the idle period of the landfill leachate shortcut nitrification reactor, returning sludge in the sedimentation tank (3) to the landfill leachate shortcut nitrification reactor (2) through a sludge return pump II (13), wherein the sludge return period is 4 times/9 d, the sludge return amount is 0.06V-0.15V of the water inlet volume (V), and the sludge concentration in the system is measured every six days, so that the sludge concentration in the landfill leachate shortcut nitrification reactor (2) is maintained at 3500-4500 mg/L;
3) Wherein the water drainage operation is that the landfill leachate short-cut nitrification reactor (2) discharges a mud-water mixture to the sedimentation tank (3) through a water outlet I (17), and discharges sewage to the mixed water tank (4) after mud-water separation in the sedimentation tank;
4) After the single-period operation is finished, repeating the steps for operation;
the operation steps of the landfill leachate anaerobic ammonia oxidation reactor are as follows:
raw garbage leachate is fed into the mixing water tank (4), mixed with the effluent of the garbage leachate short-cut nitrification reactor, and added with sodium bicarbonate to adjust the pH value to 7.3; then the wastewater enters the anaerobic ammonia oxidation reactor for landfill leachate through a second water inlet pump (14) and continuously enters water for 24 hours; controlling the flow rate of a second water inlet pump (14) to control the hydraulic retention time to be 4-12 hours; the temperature in the landfill leachate anaerobic ammonia oxidation reactor is maintained at 30-32 ℃ by controlling a water bath circulating device (16); stirring continuously for 24 hours, and controlling the stirring speed at 60-80r/min; in a secondary sedimentation tank (28) above the landfill leachate anaerobic ammonia oxidation reactor, returning sludge in a sludge recovery tank (6) into the landfill leachate anaerobic ammonia oxidation reactor (5) through a sludge return pump I (26), wherein the sludge return period is 1 time/7 d, the sludge return amount is all sludge in the sludge recovery tank (6), the sludge concentration in the landfill leachate anaerobic ammonia oxidation reactor is measured once every two weeks, and the sludge concentration in the landfill leachate anaerobic ammonia oxidation reactor is maintained at 2500-3500 mg/L; the water-absorbing cotton in the triangular weir crest and the water outlet of the landfill leachate anaerobic ammonia oxidation reactor is replaced every two weeks.
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| CN114506926A (en) * | 2022-02-15 | 2022-05-17 | 山东本源环境科技有限公司 | Anaerobic ammonia oxidation sewage treatment system |
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| CN102515350A (en) * | 2011-12-09 | 2012-06-27 | 北京工业大学 | Apparatus and method for nitrogen removal by combining garbage leachate SBR and anaerobic ammoxidation |
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| CN205907085U (en) * | 2016-08-23 | 2017-01-25 | 北京华夏大禹科技有限公司 | Sewage treatment anaerobism reaction system |
| WO2018136350A1 (en) * | 2017-01-18 | 2018-07-26 | Veolia Water Solutions & Technologies Support | Mainstream deammonification process for treating wastewater that suppresses the growth of nitrite oxidizing bacteria |
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