CN113461278A - Biochemical method for efficiently treating total nitrogen in wastewater - Google Patents
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Abstract
The invention relates to the technical field of sewage treatment, in particular to a biochemical method for efficiently treating total nitrogen in wastewater. A biochemical method for efficiently treating total nitrogen in wastewater comprises the following steps: the coal gasification wastewater and each strand of wastewater are homogenized and blended by a regulating tank; further settling the fine coal ash particles in the wastewater; the biodegradability of the wastewater is improved, and macromolecular organic matters are degraded; feeding the mixture into an IMC biochemical pool in batches through a lifting pump; controlling DO of each stage of biochemistry in the wastewater by ammonia nitrogen and total nitrogen in the IMC biochemical pool through a jet aerator under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen and the total nitrogen in the wastewater by utilizing the cultured and domesticated shortcut nitrification-denitrification bacteria; periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump; and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter. The IMC biochemical pool provided by the invention utilizes the cultured and domesticated shortcut nitrification-denitrification bacteria, can stably treat high ammonia nitrogen wastewater generated by coal gasification and discharge the wastewater up to the standard, and the treatment load is improved by 40% compared with the traditional A/O process.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a biochemical method for efficiently treating total nitrogen in wastewater.
Background
Along with the rapid development of the coal chemical industry in China, the problem of water resource environmental pollution faces increasingly serious, the A/O process of the coal chemical industry wastewater is the mainstream of the biochemical treatment of the wastewater under the common condition, and through the inspection of practical engineering, the nondegradable organic matters such as COD, phenols and the like which are chemical requirements in the wastewater can be effectively removed, however, the removal rate of total nitrogen is not good, and the reason is that: on one hand, the carbon-nitrogen ratio of high ammonia-nitrogen wastewater (C/N is less than or equal to 1.5) generated by the coal chemical process is unbalanced, and carbon sources are insufficient when ammonia nitrogen and total nitrogen are reduced in biochemical treatment, so that carbon sources can be utilized by denitrifying bacteria to become limiting factors, and the denitrification process is inhibited. On the other hand, the selection of the carbon source is not uniform with the adding amount of the carbon source, so that the shortage and waste of the supplemented carbon source are caused; in addition, the time control of nitrification and denitrification reaction in a biochemical reaction period easily causes unstable indexes of discharged ammonia nitrogen and total nitrogen; finally, if the total nitrogen is reduced and the carbon source is not well added, the growth of the biochemical sludge is easy to accelerate, and the produced filter-pressing sludge is treated as hazardous waste, so that the production cost of an enterprise is increased.
Disclosure of Invention
The invention aims to solve the technical problems and provide a low-cost and simple IMC (International Multi cycle) Multi-stage short-cut nitrification-denitrification technology, which controls the coal gasification high ammonia nitrogen wastewater to stably reach the first-class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-. Based on the purpose, the technical scheme adopted by the invention is as follows:
a biochemical method for efficiently treating total nitrogen in wastewater is characterized by comprising the following steps:
a. the coal gasification wastewater and each strand of wastewater are uniformly mixed in a regulating tank at the concentration of COD400-3-N250-400 mg/L;
b. b, enabling the wastewater in the step a to enter an air floatation tank through a lifting pump, adding a flocculating agent and a coagulant aid to further settle fine coal ash particles in the wastewater, and reducing the influence of inorganic coal ash particles on the activity of subsequent flocculent sludge;
c. b, the wastewater obtained after the treatment in the step b enters a hydrolysis acidification pool, so that the biodegradability of the wastewater is further improved, and macromolecular organic matters are degraded;
d. normally controlling the temperature of the hydrolysis acidification tank to be 30-40 ℃ through the heat energy of the coal gasification wastewater, and degrading organic nitrogen at the temperature, wherein the content of ammonia nitrogen is reduced by 6-14%;
e. d, collecting the wastewater treated in the step d through an intermediate water tank, and feeding the wastewater into the IMC biochemical tank in batches through a lifting pump;
f. controlling dissolved oxygen DO of each biochemical stage in the wastewater by using a jet aerator in an IMC biochemical pool under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen in the wastewater to be below 2mg/L and the total nitrogen to be below 5 mg/L by using cultured and domesticated shortcut nitrification-denitrification bacteria;
g. controlling the temperature of the IMC biochemical pool to be 25-40 ℃; the sludge concentration MLSS is 3000 mg/L-8000 mg/L; the pH value can be kept normal by the balance of nitrification and denitrification, and the pH is controlled to be 7.0-8.5; the alkalinity is controlled to be 50-250mg/L, and an inorganic carbon source and a micro-oxidizing environment required by denitrification are guaranteed; the C/N ratio of the carbon source required by denitrification before treatment to the wastewater is 4.5-6:1, adding;
h. periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump, and controlling the sludge age of the shortcut nitrification-denitrification biochemical sludge to be 25-40 days;
i. and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter.
Further, in the step b, the oil substances in the wastewater are separated at the position.
Further, in the step c, organic nitrogen in the wastewater is converted into inorganic ammonia nitrogen and nitrate nitrogen through anaerobic ammonia oxidizing bacteria.
Further, the carbon source in the step g is methanol.
Further, in the step i, whether suspended solid SS in the wastewater of the buffer pool reaches below 10mg or not needs to be analyzed, and if the SS in the wastewater reaches below 10mg, the wastewater can be directly discharged; if the SS in the wastewater is above 10mg, the SS in the wastewater is further reduced by sand filtration until the SS reaches below 10mg and is discharged.
Further, the sand filtration in the step i needs to be regularly backwashed by using reclaimed water.
The invention has the following beneficial effects:
(1) according to the biochemical method for efficiently treating the total nitrogen in the wastewater, the cultured and domesticated shortcut nitrification-denitrification bacteria are utilized in the IMC biochemical pool, the wastewater with high ammonia nitrogen generated by coal gasification can be stably treated and discharged up to the standard, and the treatment load is increased by 40% compared with that of the traditional A/O process; the adding ratio of the carbon source is reduced by 20 percent compared with the A/O process of the separate treatment of nitrification and denitrification, and the C/N control ratio can be stably operated by adjusting the A/O process to be between 8 and 10:1 and can be stably operated by adjusting the C/N control ratio to be between 4.5 and 6: 1.
(2) An IMC multi-section short-cut nitrification and denitrification technology is innovated. The nitrification and denitrification are carried out in the same tank, the reflux of aerobic biochemical sludge is not required to be controlled, and the denitrification efficiency can be infinitely close to 100 percent while organic matters are efficiently removed. IMC biochemical enables the operating environment to be continuously changed between facultative oxygen and aerobic oxygen by controlling oxygen supply quantity, biochemical carbon-nitrogen ratio, DO and the like, and can regard IMC process as a series combination of a plurality of A/O processes, thereby ensuring high denitrification effect. Practice proves that the IMC process can remove organic matters efficiently, and the denitrification efficiency can reach at least more than 95%.
Drawings
FIG. 1 is a schematic flow chart of the biochemical method for efficiently treating total nitrogen in wastewater according to the invention.
Detailed Description
The invention is further described below with reference to examples and figures.
Example 1
A biochemical method for efficiently treating total nitrogen in wastewater is characterized by comprising the following steps:
a. the coal gasification wastewater and each strand of wastewater are uniformly mixed in a regulating tank at the concentration of COD400-3-N250-400 mg/L;
b. b, enabling the wastewater in the step a to enter an air floatation tank through a lifting pump, adding a flocculating agent and a coagulant aid to further settle fine coal ash particles in the wastewater, and reducing the influence of inorganic coal ash particles on the activity of subsequent flocculent sludge;
c. b, the wastewater obtained after the treatment in the step b enters a hydrolysis acidification pool, so that the biodegradability of the wastewater is further improved, and macromolecular organic matters are degraded;
d. normally controlling the temperature of the hydrolysis acidification tank to be 30-40 ℃ through the heat energy of the coal gasification wastewater, mainly degrading organic nitrogen at the temperature to convert the organic nitrogen into ammonia nitrogen, and simultaneously degrading the ammonia nitrogen to reduce the ammonia nitrogen content by 6-14%;
e. d, collecting the wastewater treated in the step d through an intermediate water tank, and feeding the wastewater into the IMC biochemical tank in batches through a lifting pump;
f. controlling dissolved oxygen DO of each biochemical stage in the wastewater by using a jet aerator in an IMC biochemical pool under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen in the wastewater to be below 2mg/L and the total nitrogen to be below 5 mg/L by using cultured and domesticated shortcut nitrification-denitrification bacteria; the processing load is improved by 40 percent compared with the traditional A/O process;
g. controlling the temperature of the IMC biochemical pool to be 25-40 ℃; the sludge concentration MLSS is 3000 mg/L-8000 mg/L; the pH value can be kept normal by the balance of nitrification and denitrification, and the pH is controlled to be 7.3-8.3; the alkalinity is controlled to be 50-250mg/L, and an inorganic carbon source and a micro-oxidizing environment required by denitrification are guaranteed; the C/N ratio of the carbon source required by denitrification before treatment to the wastewater is 4.5-6:1, adding;
h. periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump, and controlling the sludge age of the shortcut nitrification-denitrification biochemical sludge to be 25-40 days;
i. and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter.
Specifically, in the step b, the method further comprises separating oil substances in the wastewater.
Specifically, in the step c, organic nitrogen in the wastewater is converted into inorganic ammonia nitrogen and nitrate nitrogen through anaerobic ammonia oxidizing bacteria.
Specifically, the carbon source in step g is methanol.
Specifically, in the step i, whether suspended solid SS in the wastewater of the buffer pool reaches below 10mg or not needs to be analyzed, and if the SS in the wastewater reaches below 10mg, the wastewater can be directly discharged; if the SS in the wastewater is above 10mg, the SS in the wastewater is further reduced by sand filtration until the SS reaches below 10mg and is discharged.
Specifically, the sand filtration in the step i needs to be regularly backwashed by using reclaimed water.
According to the biochemical method for efficiently treating the total nitrogen in the wastewater, the cultured and domesticated shortcut nitrification-denitrification bacteria are utilized in the IMC biochemical pool, the wastewater with high ammonia nitrogen generated by coal gasification can be stably treated and discharged up to the standard, and the treatment load is increased by 40% compared with the traditional A/O process; the adding ratio of the carbon source is reduced by 20 percent compared with the A/O process of the separate treatment of nitrification and denitrification, and the C/N control ratio can be stably operated by adjusting the A/O process to be between 8 and 10:1 and can be stably operated by adjusting the C/N control ratio to be between 4.5 and 6: 1.
In this example, in step a, the coal gasification wastewater and each strand of wastewater are homogenized and mixed in the adjusting tank at a COD of 400mg/L and NH3-N 250 mg/L；
b. B, enabling the wastewater in the step a to enter an air floatation tank through a lifting pump, adding a flocculating agent and a coagulant aid to further settle fine coal ash particles in the wastewater, and reducing the influence of inorganic coal ash particles on the activity of subsequent flocculent sludge;
c. b, the wastewater obtained after the treatment in the step b enters a hydrolysis acidification pool, so that the biodegradability of the wastewater is further improved, and macromolecular organic matters are degraded;
d. normally controlling the temperature of the hydrolysis acidification tank to be 36-40 ℃ through the heat energy of the coal gasification wastewater, mainly degrading organic nitrogen at the temperature to convert the organic nitrogen into ammonia nitrogen, and simultaneously degrading the ammonia nitrogen to reduce the ammonia nitrogen content by 6-14%;
e. d, collecting the wastewater treated in the step d through an intermediate water tank, and feeding the wastewater into the IMC biochemical tank in batches through a lifting pump;
f. controlling dissolved oxygen DO of each biochemical stage in the wastewater by using a jet aerator in an IMC biochemical pool under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen in the wastewater to be below 2mg/L and the total nitrogen to be below 5 mg/L by using cultured and domesticated shortcut nitrification-denitrification bacteria; the treatment load is improved by 20 percent compared with the traditional A/O process;
g. controlling the temperature of the IMC biochemical pool to be 36-40 ℃; the sludge concentration MLSS is 3000 mg/L; the pH value can be kept normal by the balance of nitrification and denitrification, and the pH is controlled to be 7; the alkalinity is controlled at 50mg/L, and an inorganic carbon source and a micro-oxidizing environment required by denitrification are guaranteed; the C/N ratio of the carbon source required by denitrification before treatment to the wastewater is 6:1, adding;
h. periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump, and controlling the sludge age of the shortcut nitrification-denitrification biochemical sludge to be 40 days;
i. and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter.
The denitrification efficiency in this example is 95%.
Example 2
A biochemical method for efficiently treating total nitrogen in wastewater comprises the following steps:
a. the coal gasification wastewater and each strand of wastewater are uniformly mixed in a regulating tank at the COD of 450mg/L and NH3-N300 mg/L;
b. b, enabling the wastewater in the step a to enter an air floatation tank through a lifting pump, adding a flocculating agent and a coagulant aid to further settle fine coal ash particles in the wastewater, and reducing the influence of inorganic coal ash particles on the activity of subsequent flocculent sludge;
c. b, the wastewater obtained after the treatment in the step b enters a hydrolysis acidification pool, so that the biodegradability of the wastewater is further improved, and macromolecular organic matters are degraded;
d. normally controlling the temperature of the hydrolysis acidification tank to be 30-40 ℃ through the heat energy of the coal gasification wastewater, mainly degrading organic nitrogen at the temperature to convert the organic nitrogen into ammonia nitrogen, and simultaneously degrading the ammonia nitrogen to reduce the ammonia nitrogen content by 6-14%;
e. d, collecting the wastewater treated in the step d through an intermediate water tank, and feeding the wastewater into the IMC biochemical tank in batches through a lifting pump;
f. controlling dissolved oxygen DO of each biochemical stage in the wastewater by using a jet aerator in an IMC biochemical pool under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen in the wastewater to be below 2mg/L and the total nitrogen to be below 5 mg/L by using cultured and domesticated shortcut nitrification-denitrification bacteria; the processing load is improved by 35 percent compared with the traditional A/O process;
g. controlling the temperature of the IMC biochemical pool to be 35 ℃; the sludge concentration MLSS is 5000 mg/L; the pH value can be kept to be normally carried out by the balance of nitrification and denitrification, and the pH value is controlled to be 7.3; the alkalinity is controlled at 100mg/L, and an inorganic carbon source and a micro-oxidizing environment required by denitrification are guaranteed; the C/N ratio of the carbon source required by denitrification before treatment to the wastewater is 5.5: 1, adding;
h. periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump, and controlling the sludge age of the shortcut nitrification-denitrification biochemical sludge to be 35 days;
i. and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter.
The denitrification efficiency in the implementation can reach 98 percent.
Example 3
A biochemical method for efficiently treating total nitrogen in wastewater comprises the following steps:
a. the coal gasification wastewater and each strand of wastewater are uniformly mixed in a regulating tank at the COD of 550mg/L and NH3-N350 mg/L;
b. b, enabling the wastewater in the step a to enter an air floatation tank through a lifting pump, adding a flocculating agent and a coagulant aid to further settle fine coal ash particles in the wastewater, and reducing the influence of inorganic coal ash particles on the activity of subsequent flocculent sludge;
c. b, the wastewater obtained after the treatment in the step b enters a hydrolysis acidification pool, so that the biodegradability of the wastewater is further improved, and macromolecular organic matters are degraded;
d. normally controlling the temperature of the hydrolysis acidification tank to be 36-40 ℃ through the heat energy of the coal gasification wastewater, mainly degrading organic nitrogen at the temperature to convert the organic nitrogen into ammonia nitrogen, and simultaneously degrading the ammonia nitrogen to reduce the ammonia nitrogen content by 6-14%;
e. d, collecting the wastewater treated in the step d through an intermediate water tank, and feeding the wastewater into the IMC biochemical tank in batches through a lifting pump;
f. controlling dissolved oxygen DO of each biochemical stage in the wastewater by using a jet aerator in an IMC biochemical pool under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen in the wastewater to be below 2mg/L and the total nitrogen to be below 5 mg/L by using cultured and domesticated shortcut nitrification-denitrification bacteria; the processing load is improved by 40 percent compared with the traditional A/O process;
g. controlling the temperature of the IMC biochemical pool to be 30-35 ℃; the sludge concentration MLSS is 4000 mg/L; the pH value can be kept to be normally carried out by the balance of nitrification and denitrification, and the pH value is controlled to be 7.5; the alkalinity is controlled at 150mg/L, and an inorganic carbon source and a micro-oxidizing environment required by denitrification are guaranteed; the C/N ratio of the carbon source required by denitrification before treatment to the wastewater is 5: 1, adding;
h. periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump, and controlling the sludge age of the shortcut nitrification-denitrification biochemical sludge to be 30 days;
i. and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter.
In this embodiment, the denitrification efficiency can reach 99.5%.
Example 4
A biochemical method for efficiently treating total nitrogen in wastewater comprises the following steps:
a. the coal gasification wastewater and each strand of wastewater are uniformly mixed at 600mg/L and NH by the regulating tank3-N400 mg/L;
b. b, enabling the wastewater in the step a to enter an air floatation tank through a lifting pump, adding a flocculating agent and a coagulant aid to further settle fine coal ash particles in the wastewater, and reducing the influence of inorganic coal ash particles on the activity of subsequent flocculent sludge;
c. b, the wastewater obtained after the treatment in the step b enters a hydrolysis acidification pool, so that the biodegradability of the wastewater is further improved, and macromolecular organic matters are degraded;
d. normally controlling the temperature of the hydrolysis acidification tank to be 36-40 ℃ through the heat energy of the coal gasification wastewater, mainly degrading organic nitrogen at the temperature to convert the organic nitrogen into ammonia nitrogen, and simultaneously degrading the ammonia nitrogen to reduce the ammonia nitrogen content by 6-14%;
e. d, collecting the wastewater treated in the step d through an intermediate water tank, and feeding the wastewater into the IMC biochemical tank in batches through a lifting pump;
f. controlling dissolved oxygen DO of each biochemical stage in the wastewater by using a jet aerator in an IMC biochemical pool under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen in the wastewater to be below 2mg/L and the total nitrogen to be below 5 mg/L by using cultured and domesticated shortcut nitrification-denitrification bacteria; the processing load is improved by 45 percent compared with the traditional A/O process;
g. controlling the temperature of the IMC biochemical pool to be 30-36 ℃; the sludge concentration MLSS is 6000 mg/L; the pH value can be kept to be normally carried out by the balance of nitrification and denitrification, and the pH value is controlled to be 7.5; the alkalinity is controlled at 250mg/L, and an inorganic carbon source and a micro-oxidizing environment required by denitrification are guaranteed; the C/N ratio of the carbon source required by denitrification before treatment to the wastewater is 5: 1, adding;
h. periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump, and controlling the sludge age of the shortcut nitrification-denitrification biochemical sludge to be 25 days;
i. and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter.
In the embodiment, the denitrification efficiency can reach 97%. The total nitrogen in the invention comprises ammonia nitrogen, organic nitrogen, nitrate and nitrite. The biochemical method provided by the invention converts organic nitrogen into ammonia nitrogen for removal, the ammonia nitrogen is converted into nitrate, and nitrate and nitrite are finally converted into nitrogen. In the traditional A/O process, the denitrification efficiency of the A-level tank needs to be improved, and the more nitrate nitrogen the reflux liquid provides, the better. The reflux ratio can be increased, so that the enrichment of the A-level pool is possible to cause, the denitrification environment is damaged, the dissolved oxygen in the A-level pool cannot meet the condition of being reduced to the anoxic condition, the denitrification efficiency is low, and the power consumption is increased. The quality of water discharged from the O-level tank to the sedimentation tank is the same as that of water flowing back to the A-level tank, and the increase of the nitrate nitrogen concentration means that the effluent contains nitrogen and the effluent exceeds the standard directly. Therefore, the denitrification of the A/O process is limited, and the denitrification efficiency is usually not more than 85%.
An IMC multi-section short-cut nitrification and denitrification technology is innovated. A biochemical pool A level pool and an O level pool are the same pool, and conversion is achieved through DO control. The nitrification and denitrification are carried out in the same tank, the reflux of aerobic biochemical sludge is not required to be controlled, and the denitrification efficiency can be infinitely close to 100 percent while organic matters are efficiently removed. IMC biochemical enables the operating environment to be continuously changed between facultative oxygen and aerobic oxygen by controlling oxygen supply quantity, biochemical carbon-nitrogen ratio, DO and the like, and can regard IMC process as a series combination of a plurality of A/O processes, thereby ensuring high denitrification effect. Practice shows that the IMC process can remove organic matters efficiently, and the denitrification efficiency can reach more than 95%.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention; thus, while the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.
Claims (6)
1. A biochemical method for efficiently treating total nitrogen in wastewater is characterized by comprising the following steps:
a. the coal gasification wastewater and each strand of wastewater are uniformly mixed in a regulating tank with the COD of 400-600mg/L and the NH content3-N250-400 mg/L;
b. b, enabling the wastewater in the step a to enter an air floatation tank through a lifting pump, adding a flocculating agent and a coagulant aid to further settle fine coal ash particles in the wastewater, and reducing the influence of inorganic coal ash particles on the activity of subsequent flocculent sludge;
c. b, the wastewater obtained after the treatment in the step b enters a hydrolysis acidification pool, so that the biodegradability of the wastewater is further improved, and macromolecular organic matters are degraded;
d. normally controlling the temperature of the hydrolysis acidification tank to be 30-40 ℃ through the heat energy of the coal gasification wastewater, and degrading organic nitrogen at the temperature, wherein the content of ammonia nitrogen is reduced by 6-14%;
e. d, collecting the wastewater treated in the step d through an intermediate water tank, and feeding the wastewater into the IMC biochemical tank in batches through a lifting pump;
f. controlling dissolved oxygen DO of each biochemical stage in the wastewater by using a jet aerator in an IMC biochemical pool under the condition of intermittent aeration of an air blower, and degrading the ammonia nitrogen in the wastewater to be below 2mg/L and the total nitrogen to be below 5 mg/L by using cultured and domesticated shortcut nitrification-denitrification bacteria;
g. controlling the temperature of the IMC biochemical pool to be 25-40 ℃; the sludge concentration MLSS is 3000 mg/L-8000 mg/L; the pH value can be kept normal by the balance of nitrification and denitrification, and the pH is controlled to be 7.0-8.5; the alkalinity is controlled to be 50-250mg/L, and an inorganic carbon source and a micro-oxidizing environment required by denitrification are guaranteed; the C/N ratio of the carbon source required by denitrification before treatment to the wastewater is 4.5-6:1, adding;
h. periodically discharging sludge to a sludge concentration tank by using an IMC biochemical tank sludge discharge pump, and controlling the sludge age of the shortcut nitrification-denitrification biochemical sludge to be 25-40 days;
i. and discharging the wastewater after biochemical treatment into a buffer water tank through a decanter.
2. The biochemical method for efficiently treating the total nitrogen in the wastewater according to claim 1, wherein the step b further comprises separating oil substances in the wastewater.
3. The biochemical method for efficiently treating the total nitrogen in the wastewater according to claim 1, wherein the step c further comprises converting organic nitrogen in the wastewater into inorganic ammonia nitrogen and nitrate nitrogen by anaerobic ammonium oxidation bacteria.
4. The biochemical method for efficiently treating total nitrogen in wastewater according to claim 1, wherein the carbon source in the step g is methanol.
5. The biochemical method for efficiently treating the total nitrogen in the wastewater as claimed in claim 1, wherein, in the step i, whether the SS content of suspended solids in the wastewater in the buffer pool reaches below 10mg or not is analyzed, and if the SS content in the wastewater reaches below 10mg, the wastewater can be directly discharged; if the SS in the wastewater is above 10mg, the SS in the wastewater is further reduced by sand filtration until the SS reaches below 10mg and is discharged.
6. The biochemical method for efficiently treating the total nitrogen in the wastewater according to claim 5, wherein the sand filtration in the step i needs to be periodically backwashed by using reclaimed water.
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| CN102417279A (en) * | 2011-12-01 | 2012-04-18 | 丁海荣 | Coal dust/coal slurry gasification device-based sewage treatment and recycle system approach |
| CN207330633U (en) * | 2017-08-14 | 2018-05-08 | 义马煤业综能新能源有限责任公司 | A kind of utilization system of high-ammonia nitrogen low C OD waste water |
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