CN103253835B - Coal gasification wastewater treatment device and treatment method thereof - Google Patents
Coal gasification wastewater treatment device and treatment method thereof Download PDFInfo
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- CN103253835B CN103253835B CN201310220988.8A CN201310220988A CN103253835B CN 103253835 B CN103253835 B CN 103253835B CN 201310220988 A CN201310220988 A CN 201310220988A CN 103253835 B CN103253835 B CN 103253835B
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Abstract
The invention discloses a coal gasification wastewater treatment device. When the treatment device is used, the coal gasification wastewater of which partial suspended matters are removed by a regulating pool and a physical and chemical sedimentation pool enters a first biological oxidation pool from a first water inlet; after a short-range nitrification and denitrification reaction is performed on the coal gasification wastewater through a first carrier for the first time, the coal gasification wastewater flows into a second biological oxidation pool from a first channel; after the secondary short-range nitrification and denitrification reaction is performed on the coal gasification wastewater through a second carrier, the coal gasification wastewater flows into a third biological oxidation pool from a second channel; a denitrification reaction is performed through a third carrier and then a nitrification reaction is performed through a fourth carrier; and the coal gasification wastewater is discharged from a water pipe after the treatment process is finished, wherein the nitrification reaction is controlled at the nitrite stage during the short-range nitrification and denitrification reaction, so that the denitrification reaction is performed directly under the condition that nitrite is not further oxidized into nitrate; and thus the wastewater denitrification process is shortened. A supplementing device is used for supplementing a carbon source and alkalinity. The invention further provides a coal gasification wastewater treatment method.
Description
Technical field
The present invention relates to coal gasification waste water processing technology field, particularly a kind of coal gasification waste water treatment unit and treatment process thereof.
Background technology
Along with the sustained and rapid development of China's economy, there is higher rate of growth in the demand of the energy, Chemicals, and the status of Coal Chemical Industry in China's energy, chemical field becomes increasingly conspicuous.Gasification is Coal Chemical Industry one of the technology of core the most, and this technology is widely used in the commercial runs such as gas maked coal, synthetic ammonia, coal power generation.
Coal gasification waste water is vapourizing furnace manufacturing the waste water producing in the process of coal gas or substitute natural gas, is the industrial organic waste water of a kind of typical high density, high pollution, poisonous, difficult degradation.At present, the processing of domestic coal gasification waste water generally adopts materialization to process the method combining with biological treatment, concrete is to realize denitrogenation of waste water by the complete nitrification and denitrification reaction in biologic treating technique, reaction process is long, processing cost is high, hydraulic detention time is long, and partially disposed technique need to additionally add a large amount of alkali and carbon source maintains normally carrying out of biochemical reaction.
Therefore, how to provide a kind of coal gasification waste water treatment unit, to improve treatment effect, shorten the treatment time, reducing running cost is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of coal gasification waste water treatment unit, to improve treatment effect, shorten the treatment time, reduce running cost; Another object of the present invention is to provide a kind of coal gasification waste water treatment process, to improve treatment effect, shortens the treatment time, reduces running cost.
For solving the problems of the technologies described above, the invention provides following scheme:
A kind of coal gasification waste water treatment unit, comprise the first bio-oxidation pond setting gradually, the second bio-oxidation pond being communicated with described the first bio-oxidation pond by first channel, the 3rd bio-oxidation pond being communicated with described the second bio-oxidation pond by second passage, for the supplementary device of supplementary carbon source and basicity, total water inlet and Dissolved Oxygen concentration Control device, wherein, described the first bio-oxidation pond is provided with from the first water-in of described total water inlet shunting, for the first carrier of attached microbial with for limiting the first carrier stationary installation of described the first carrier scope, described the first carrier comprises that pore diameter range is a large amount of holes of 1mm-4mm, described the second bio-oxidation pond is provided with for the Second support of attached microbial with for limiting the Second support stationary installation of described Second support scope, described Second support comprises that pore diameter range is a large amount of holes of 1mm-4mm, described the 3rd bio-oxidation pond be provided be arranged in order for the 3rd carrier of attached microbial with for the 4th carrier of attached microbial, also be provided with the 3rd carrier stationary installation for limiting described the 3rd carrier scope and for limiting the 4th carrier stationary installation of described the 4th carrier scope, described the 3rd carrier comprises that pore diameter range is a large amount of holes of 1mm-2mm, described the 4th carrier comprises that pore diameter range is a large amount of holes of 4mm-7mm, described the 3rd bio-oxidation pond is also provided with rising pipe.
Preferably, above-mentioned supplementary device comprises from the second water-in and the 3rd water-in of described total water inlet shunting, wherein, described the second water-in is communicated with described the second bio-oxidation pond, and be positioned at the connectivity part of described the first bio-oxidation pond and described the second bio-oxidation pond, described the 3rd water-in is communicated with described the 3rd bio-oxidation pond, and is positioned at the connectivity part of described the second bio-oxidation pond and described the 3rd bio-oxidation pond.
Preferably, above-mentioned the first bio-oxidation pond equates with the volume of described the second bio-oxidation pond, the volume of described the 3rd bio-oxidation pond account for fill described the first bio-oxidation pond, described the second bio-oxidation pond and three bio-oxidation ponds of described the 3rd bio-oxidation pond cubic capacity 20%～25%.
Preferably, above-mentioned the first bio-oxidation pond, described the second bio-oxidation pond and described the 3rd bio-oxidation pond are provided with sludge hopper and mud discharging mouth.
Preferably, above-mentioned the first water-in is positioned at the top of described the first bio-oxidation pond, the bottom of described the first bio-oxidation pond is communicated with the bottom of described the second bio-oxidation pond, the top of described the second bio-oxidation pond is communicated with the top of described the 3rd bio-oxidation pond, and described rising pipe is positioned at the bottom of described the 3rd bio-oxidation pond.
Preferably, above-mentioned Dissolved Oxygen concentration Control device comprises aeration tube and air generator.
Preferably, above-mentioned the first carrier, described Second support and described the 3rd carrier are urethane porous cubes.
The present invention also provides a kind of coal gasification waste water treatment process, comprise: step 1) is fixedly installed in the first bio-oxidation pond has the first carrier that pore diameter range is a large amount of holes of 1mm-4mm, described the first carrier forms aerobic in the first bio-oxidation pond, the combination of anoxic and anaerobic environment, in the second bio-oxidation pond, be fixedly installed and there is the Second support that pore diameter range is a large amount of holes of 1mm-4mm, described Second support be formed in the second bio-oxidation pond, form aerobic, the combination of anoxic and anaerobic environment, in the 3rd bio-oxidation pond, be arranged in order arrange have pore diameter range be 1mm-2mm a large amount of holes the 3rd carrier and there is the 4th carrier that pore diameter range is a large amount of holes of 4mm-7mm, wherein, the 3rd carrier forms inner anaerobic environment, described the 4th carrier forms aerobic environment, step 2) coal gasification waste water is passed in described the first bio-oxidation pond, control described the first bio-oxidation pond and described the second bio-oxidation pond dissolved oxygen concentration remains on 1～1.5mg/L, control described the 3rd bio-oxidation pond dissolved oxygen concentration and remain on 1.5～2.5mg/L, coal gasification waste water is passed to described the second bio-oxidation pond from described the first bio-oxidation pond and is passed to described the 3rd bio-oxidation pond again and completes treating processes.
Preferably, above-mentioned steps 2) in also comprise adopt former moisture flow supplementary carbon source and basicity, former moisture flow be specially the described coal gasification waste water of independent shunting to described the second bio-oxidation pond and separately the described coal gasification waste water of shunting to described the 3rd bio-oxidation pond.
Preferably, the coal gasification waste water that passes into described the first bio-oxidation pond accounts for 55%～60% of total coal gasification waste water, the coal gasification waste water that passes into described the second bio-oxidation pond accounts for 30%～35% of total coal gasification waste water, and the remainder in described total coal gasification waste water passes in described the 3rd bio-oxidation pond.
The coal gasification waste water treatment unit that the invention described above provides, comprise the first bio-oxidation pond setting gradually, the second bio-oxidation pond being communicated with described the first bio-oxidation pond by first channel, the 3rd bio-oxidation pond being communicated with described the second bio-oxidation pond by second passage, for the supplementary device of supplementary carbon source and basicity, total water inlet and Dissolved Oxygen concentration Control device, wherein, described the first bio-oxidation pond is provided with from the first water-in of described total water inlet shunting, for the first carrier of attached microbial with for limiting the first carrier stationary installation of described the first carrier scope, described the first carrier comprises that pore diameter range is a large amount of holes of 1mm-4mm, described the second bio-oxidation pond is provided with for the Second support of attached microbial with for limiting the Second support stationary installation of described Second support scope, described Second support comprises that pore diameter range is a large amount of holes of 1mm-4mm, described the 3rd bio-oxidation pond be provided be arranged in order for the 3rd carrier of attached microbial with for the 4th carrier of attached microbial, also be provided with the 3rd carrier stationary installation for limiting described the 3rd carrier scope and for limiting the 4th carrier stationary installation of described the 4th carrier scope, described the 3rd carrier comprises that pore diameter range is a large amount of holes of 1mm-2mm, described the 4th carrier comprises that pore diameter range is a large amount of holes of 4mm-7mm, described the 3rd bio-oxidation pond is also provided with rising pipe.
When use, the coal gasification waste water of removing after partial suspended thing through equalizing tank, the pre-treatment of physical chemistry settling tank is entered into the first bio-oxidation pond from the first water-in, after the first carrier completes short-cut nitrification and denitrification reaction for the first time, flow into the second bio-oxidation pond from first channel, after Second support completes short-cut nitrification and denitrification reaction for the second time, flow into the 3rd bio-oxidation pond from second passage, first complete anti-nitration reaction through the 3rd carrier, complete nitration reaction through the 4th carrier again, complete treating processes and discharge from rising pipe.
Wherein, short-cut nitrification and denitrification denitrification process is NH
4 +-N → NO
2 --N → N
2, and traditional denitrification process adopts complete nitrification and denitrification, its denitrification process is NH
4 +-N → NO
2 --N → NO
3 --N → N
2, nitration reaction is controlled at the nitrite stage by short-cut nitrification and denitrification reaction, makes it no longer further be oxidized to nitrate and directly carry out anti-nitration reaction, shortened denitrogenation of waste water process, reduced the energy consumption in reaction process.
Wherein, in order to guarantee carrying out smoothly of short-cut nitrification and denitrification reaction, first, remain on 1～1.5mg/L by the first bio-oxidation pond described in the control of Dissolved Oxygen concentration Control device and described the second bio-oxidation pond dissolved oxygen concentration, make the dissolved oxygen concentration in the first bio-oxidation pond and the second bio-oxidation pond remain on lower level, and, Dissolved Oxygen concentration Control device continues aeration and makes three bio-oxidation ponds keep the good oxygen condition in macroscopic view, and the first carrier and Second support include a large amount of holes that pore diameter range is 1mm-4mm, this special construction of its inside can form again a large amount of anoxics, the micro of anaerobism, so just in the first bio-oxidation pond and the second bio-oxidation pond, all form aerobic, the combination of anoxic and anaerobic environment, for nitrobacteria, the multiple-microorganisms such as denitrifying bacterium provide different growing environments, guarantee nitrobacteria, the multiple-microorganisms such as denitrifying bacterium in vigor state, can carry out nitration reaction and anti-nitration reaction, because Nitrosomas is better than Nitromonas to the competitive capacity of oxygen, under lower dissolved oxygen concentration condition, be that dissolved oxygen concentration remains on 1～1.5mg/L, Nitrite bacteria is occupied an leading position in nitrifying bacteria community system, thereby utilize the microorganism in the first carrier to carry out short-cut nitrification and denitrification, nitration reaction is controlled to Nitrification Stage to remove the ammonia nitrogen in coal gasification waste water, then utilize organism that coal gasification waste water itself just has as electron donor, with NO
2 --N carries out denitrification as electron acceptor(EA), remove total nitrogen and organism, coal gasification waste water carries out after short-cut nitrification and denitrification reaction in the first bio-oxidation pond, enter into the second bio-oxidation pond and carry out short-cut nitrification and denitrification reaction for the second time, to guarantee the further processing to coal gasification waste water, guarantee treatment effect.
Wherein, in the first bio-oxidation pond and the second bio-oxidation pond, short-cut nitrification and denitrification is difficult to guarantee NH
4 +-N, NO
2 -the removal completely of-N, in the 3rd bio-oxidation pond, the 3rd carrier comprises that pore diameter range is a large amount of holes of 1mm-2mm, form an inner anaerobic environment, its microorganism is take denitrifying bacterium as main, and the 4th carrier comprises that pore diameter range is a large amount of holes of 4mm-7mm, form an aerobic environment, its microorganism, take nitrobacteria as main, so just can utilize the microorganism in the 3rd carrier to carry out denitrification, makes NO
2 -the organism that-N provides with coal gasification waste water reacts, and then utilizes the further remaining NH of oxidation of microorganism in the 4th carrier
4 +-N and NO
2 --N, to guarantee effective removal of oxygen consumption inorganic nitrogen.
Wherein, in the 3rd bio-oxidation pond, remaining on 1.5～2.5mg/L by Dissolved Oxygen concentration Control device control the 3rd bio-oxidation pond dissolved oxygen concentration, is that nitration reaction and the anti-nitration reaction in the 3rd bio-oxidation pond created good environment.
Coal gasification waste water treatment unit provided by the invention utilizes short-cut nitrification and denitrification principle synchronously to remove organism, ammonia nitrogen and total nitrogen, reduce oxygen than common denitrification process, the consumption of carbon source and basicity, shorten reaction mechanism, shorten the treatment time, hydraulic detention time is short, by the dissolved oxygen concentration in each bio-oxidation pond of Dissolved Oxygen concentration Control device control, realize the diversity of microorganism in different carriers, each quasi-microorganism is separately in favourable growing environment, under well-fed condition, keep very high biological activity, and in realizing short-cut nitrification and denitrification, guarantee ammonia nitrogen, effective removal of nitrite, nitric efficiency is high, simultaneously owing to having reduced oxygen, the consumption of basicity and carbon source and saved running cost.
Accompanying drawing explanation
The structural representation of the coal gasification waste water treatment unit that Fig. 1 provides for the embodiment of the present invention.
In upper Fig. 1:
Total water inlet 1, the first water-in 11, the second water-in 12, the 3rd water-in 13, the first carrier 21, Second support 22, the 3rd carrier 23, the 4th carrier 24, the first bio-oxidation pond 31, the second bio-oxidation pond 32, the 3rd bio-oxidation pond 33, first channel 41, second passage 42, rising pipe 5, aeration tube 6, upper catch net 71, lower catch net 72, middle catch net 73, sludge hopper 8, mud discharging mouth 9, air generator 101.
Embodiment
Core of the present invention is to provide a kind of coal gasification waste water treatment unit, to shorten the treatment time, reduces running cost; Another core of the present invention is to provide a kind of coal gasification waste water treatment process, to shorten the treatment time, reduces running cost.
In order to make those skilled in the art understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, the structural representation of the coal gasification waste water treatment unit that Fig. 1 provides for the embodiment of the present invention.
The coal gasification waste water treatment unit that the embodiment of the present invention provides, comprise the first bio-oxidation pond 31 setting gradually, the second bio-oxidation pond 32 being communicated with the first bio-oxidation pond 31 by first channel 41, the 3rd bio-oxidation pond 33 being communicated with the second bio-oxidation pond 32 by second passage 42, for supplementing the needed carbon source of biochemical reaction, the supplementary device of basicity, total water inlet 1 and Dissolved Oxygen concentration Control device, wherein, the first bio-oxidation pond 31 is provided with the first water-in 11 of shunting from total water inlet 1, for the first carrier 21 of attached microbial with for limiting the first carrier stationary installation of scope of the first carrier 21, the first carrier 21 comprises that pore diameter range is a large amount of holes of 1mm-4mm, the second bio-oxidation pond 32 is provided with for the Second support 22 of attached microbial with for limiting the Second support stationary installation of Second support 22 scopes, Second support 22 comprises that pore diameter range is a large amount of holes of 1mm-4mm, the 3rd bio-oxidation pond 33 be provided be arranged in order for the 3rd carrier 23 of attached microbial with for the 4th carrier 24 of attached microbial, also be provided with the 3rd carrier stationary installation for limiting the 3rd carrier 23 scopes and for limiting the 4th carrier stationary installation of the 4th carrier 24 scopes, the 3rd carrier 23 comprises that pore diameter range is a large amount of holes of 1mm-2mm, the 4th carrier 24 comprises that pore diameter range is a large amount of holes of 4mm-7mm, the 3rd bio-oxidation pond 33 is also provided with rising pipe 5.
When use, will be through equalizing tank, the coal gasification waste water that the pre-treatment of physical chemistry settling tank is removed after partial suspended thing enters into the first bio-oxidation pond 31 from the first water-in 11, after the first carrier 21 completes short-cut nitrification and denitrification reaction for the first time, flow into the second bio-oxidation pond 32 from first channel 41, after Second support 22 completes short-cut nitrification and denitrification reaction for the second time, flow into the 3rd bio-oxidation pond 33 from second passage 42, first complete anti-nitration reaction through the 3rd carrier 23, complete nitration reaction through the 4th carrier 24 again, completing treating processes discharges from rising pipe.
Wherein, short-cut nitrification and denitrification reaction denitrification process is NH
4 +-N → NO
2 --N → N
2, and traditional denitrification process adopts complete nitrification and denitrification, its denitrification process is NH
4 +-N → NO
2 --N → NO
3 --N → N
2, nitration reaction is controlled at the nitrite stage by short-cut nitrification and denitrification reaction, makes it no longer further be oxidized to nitrate and directly carry out anti-nitration reaction, shortened denitrogenation of waste water process, reduced the energy consumption in reaction process.
Wherein, in order to guarantee carrying out smoothly of short-cut nitrification and denitrification reaction, first, remain on 1～1.5mg/L by Dissolved Oxygen concentration Control device control the first bio-oxidation pond 31 and the second bio-oxidation pond 32 dissolved oxygen concentrations, make the dissolved oxygen concentration in the first bio-oxidation pond 31 and the second bio-oxidation pond 32 remain on lower level, and, Dissolved Oxygen concentration Control device continues aeration and makes three bio-oxidation ponds keep the good oxygen condition in macroscopic view, and the first carrier 21 and Second support 22 include a large amount of holes that pore diameter range is 1mm-4mm, this special construction of its inside can form again a large amount of anoxics, the micro of anaerobism, so just in the first bio-oxidation pond 31 and the second bio-oxidation pond 32, all form aerobic, the combination of anoxic and anaerobic environment, for nitrobacteria, the multiple-microorganisms such as denitrifying bacterium provide different growing environments, guarantee nitrobacteria, the multiple-microorganisms such as denitrifying bacterium in vigor state, can carry out nitration reaction and anti-nitration reaction, because Nitrosomas is better than Nitromonas to the competitive capacity of oxygen, under lower dissolved oxygen concentration condition, be that dissolved oxygen concentration remains on 1～1.5mg/L, Nitrite bacteria is occupied an leading position in nitrifying bacteria community system, make nitrification concentrate on Nitrification Stage, thereby utilize the microorganism in the first carrier 21 to carry out short-cut nitrification and denitrification, nitration reaction is controlled to Nitrification Stage to remove the ammonia nitrogen in coal gasification waste water, then the organism that utilizes coal gasification waste water itself just to have, as electron donor, with NO
2 --N carries out denitrification as electron acceptor(EA), remove total nitrogen and organism, coal gasification waste water carries out after short-cut nitrification and denitrification reaction in the first bio-oxidation pond 31, enter into the second bio-oxidation pond 32 and carry out short-cut nitrification and denitrification reaction for the second time, to guarantee the further processing to coal gasification waste water, guarantee treatment effect.
Wherein, in the first bio-oxidation pond 31 and the second bio-oxidation pond 32, short-cut nitrification and denitrification is difficult to guarantee NH
4 +-N, NO
2 -the removal completely of-N, in the 3rd bio-oxidation pond 33, the 3rd carrier 23 comprises that pore diameter range is a large amount of holes of 1mm-2mm, form an inner anaerobic environment, its microorganism is take denitrifying bacterium as main, and the 4th carrier 24 comprises that pore diameter range is a large amount of holes of 4mm-7mm, form an aerobic environment, its microorganism, take nitrobacteria as main, so just can utilize the microorganism in the 3rd carrier 23 to carry out denitrification, makes NO
2 -the organism that-N provides with coal gasification waste water reacts the further remaining NH of oxidation of microorganism then utilizing in the 4th carrier 24
4 +-N and NO
2 --N, to guarantee effective removal of oxygen consumption inorganic nitrogen.
Wherein, in the 3rd bio-oxidation pond 33, remain on 1.5～2.5mg/L by Dissolved Oxygen concentration Control device control the 3rd bio-oxidation pond 33 dissolved oxygen concentrations, so that the microorganism of the 4th carrier inside is in good oxygen condition, the microorganism of the 3rd carrier inside, in anoxic condition, is that nitration reaction and the anti-nitration reaction in the 3rd bio-oxidation pond 33 created good environment.
Coal gasification waste water treatment unit provided by the invention utilizes short-cut nitrification and denitrification principle synchronously to remove organism, ammonia nitrogen and total nitrogen, reduce oxygen than common denitrification process, the consumption of carbon source and basicity, shorten reaction mechanism, shorten the treatment time, hydraulic detention time is short, running cost is low, by the dissolved oxygen concentration in each bio-oxidation pond of Dissolved Oxygen concentration Control device control, realize the diversity of microorganism in different carriers, each quasi-microorganism is separately in favourable growing environment, under well-fed condition, keep very high biological activity, and in realizing short-cut nitrification and denitrification, guarantee ammonia nitrogen, effective removal of nitrite.
Wherein, the first carrier stationary installation, Second support stationary installation, the 3rd carrier stationary installation and the 4th carrier stationary installation can be upper catch net 71 and lower catch net 72, respectively the first carrier 21 and Second support 22 are limited between upper catch net 71 and lower catch net 72, wherein, the 3rd carrier 23 and the 4th carrier 24 can use three catch nets, go up catch net 71, middle catch net 73 and lower catch net 72, wherein, the 3rd carrier 23 is limited between catch net 71 and middle catch net 73, and the 4th carrier 24 is limited between middle catch net 73 and lower catch net 72.
Concrete, supplementary device can be former water diversion device, comprise the second water-in 12 and the 3rd water-in 13 shunted from total water inlet 1, wherein, the second water-in 12 is communicated with the second bio-oxidation pond 32, and be positioned at the connectivity part of the first bio-oxidation pond 31 and the second bio-oxidation pond 32, the 3rd water-in 13 is communicated with the 3rd bio-oxidation pond 33, and is positioned at the connectivity part of the second bio-oxidation pond 32 and the 3rd bio-oxidation pond 33.The pH-value of coal gasification waste water is that alkalescence is higher, and, contain abundant organism, organism can be used as carbon source and uses, therefore, coal gasification waste water can be used in supplementary carbon source and basicity completely, coal gasification waste water enters into the second bio-oxidation pond 32 from the second water-in 12, enter into the 3rd bio-oxidation pond 3 from the 3rd water-in 13, realize multipoint water feeding, taken full advantage of carbon source limited in coal gasification waste water and basicity, saved and additionally added the running cost that basicity and carbon source are brought, and, further shortened treatment time of coal gasification waste water.
Simultaneously, the second water-in 12 is positioned at the connectivity part of the first bio-oxidation pond 31 and the second bio-oxidation pond 32, it is the exit that first channel 41 leads to the second bio-oxidation pond 32, like this, the coal gasification waste water of coming from the first bio-oxidation pond 31 can obtain supplementing of organism and basicity in time, and mixes.In like manner, the 3rd water-in 13 is positioned at the connectivity part of the second bio-oxidation pond 32 and the 3rd bio-oxidation pond 33, it is the exit that second passage 42 leads to the 3rd bio-oxidation pond 33, like this, the coal gasification waste water of coming from the second bio-oxidation pond 32 can obtain supplementing of organism and basicity in time, and mixes.
Concrete, the first bio-oxidation pond 31 equates with the volume of the second bio-oxidation pond 32, the volume of the 3rd bio-oxidation pond 33 account for fill the first bio-oxidation pond 31, the second bio-oxidation pond 32 and 33 3 bio-oxidation ponds of the 3rd bio-oxidation pond cubic capacity 20%～25%.Because the main processing of coal gasification waste water is to carry out in the first bio-oxidation pond 31 and the second bio-oxidation pond 32, both volumes equate to guarantee the continuity for the treatment of processes, in both, any one crosses the waste that senior general causes volume, and setting up of the 3rd bio-oxidation pond 33 is in order to prevent that short-cut nitrification and denitrification is above difficult to guarantee NH
4 +-N, NO
2 -the removal completely of-N, therefore, the volume of the 3rd bio-oxidation pond 33 is without excessive, can reduce cost of manufacture, simultaneously, its volume accounts for the 20%～25% completely enough of cubic capacity, if the volume of the 3rd bio-oxidation pond 33 is excessive, may be because the processing speed that the first bio-oxidation pond 31 and the second bio-oxidation pond 32 processing speeds do not catch up with oneself causes a part of volume free time, very waste, if the volume of the 3rd bio-oxidation pond 33 is too small, may due to the first bio-oxidation pond 31 and the second bio-oxidation pond 32 processing speeds be too fast and the processing speed of oneself does not catch up with, cause unnecessary coal gasification waste water alluvial too much, affect whole treating processes.
Concrete, the first bio-oxidation pond 31, the second bio-oxidation pond 32 and the 3rd bio-oxidation pond 33 are provided with sludge hopper 8 and mud discharging mouth 9, can realize the eliminating to the mud in coal gasification waste water.
Concrete, the first water-in 11 is positioned at the top of the first bio-oxidation pond 31, the bottom of the first bio-oxidation pond 31 is communicated with the bottom of the second bio-oxidation pond 32, the top of the second bio-oxidation pond 32 is communicated with the top of the 3rd bio-oxidation pond 33, and rising pipe 5 is positioned at the bottom of the 3rd bio-oxidation pond 33.So just can form very coherent flow process, coal gasification waste water flows downward from the first water-in 11 enters, enter into the bottom of the second bio-oxidation pond 32 from first channel 41 from the bottom of the first bio-oxidation pond 31 through the first carrier 21, then water level slowly rises, through Second support 22, enter into the top of the 3rd bio-oxidation pond 33 by second passage 42 from the top of the second bio-oxidation pond 32, now, the 3rd carrier 23 is set upper, the 4th carrier 24 under, be arranged in order, coal gasification waste water flows downward after entering into the 3rd bio-oxidation pond 33 so, through the 3rd carrier 23, then through the 4th carrier 24, flow out from the rising pipe 5 of the bottom that is positioned at the 3rd bio-oxidation pond 33, complete treating processes.
Concrete, Dissolved Oxygen concentration Control device comprises aeration tube 6 and air generator 101, and equipment is simple and practical, easy to maintenance, and wherein air generator 101 can be centrifugal fan, can be also air compressor.
Concrete, the first carrier 21, Second support 22 and the 3rd carrier 23 are urethane porous cubes.This structure is easier to form the micro of a large amount of anoxics, anaerobism.
The embodiment of the present invention also provides a kind of coal gasification waste water treatment process, comprise: step 1) is fixedly installed in the first bio-oxidation pond 31 has the first carrier 21 that pore diameter range is a large amount of holes of 1mm-4mm, the first carrier 21 be formed in the first bio-oxidation pond 31, form aerobic, the combination of anoxic and anaerobic environment, in the second bio-oxidation pond, 32 are fixedly installed and have the Second support 22 that pore diameter range is a large amount of holes of 1mm-4mm, Second support 22 be formed in the second bio-oxidation pond 32, form aerobic, the combination of anoxic and anaerobic environment, in the 3rd bio-oxidation pond 33, be arranged in order arrange have pore diameter range be 1mm-2mm a large amount of holes the 3rd carrier 23 and there is the 4th carrier 24 that pore diameter range is a large amount of holes of 4mm-7mm, wherein, the 3rd carrier 23 forms inner anaerobic environment, the 4th carrier 24 forms aerobic environment, step 2) coal gasification waste water is passed in the first bio-oxidation pond 31, control the first bio-oxidation pond 31 and the second bio-oxidation pond 32 dissolved oxygen concentrations remain on 1～1.5mg/L simultaneously, control the 3rd bio-oxidation pond 33 dissolved oxygen concentrations and remain on 1.5～2.5mg/L, carry out row short-cut nitrification and denitrification, coal gasification waste water is passed to the second bio-oxidation pond 32 from the first bio-oxidation pond 31 and is passed to the 3rd bio-oxidation pond 33 again and completes treating processes.
The coal gasification waste water treatment process that the embodiment of the present invention provides is based on above-mentioned coal gasification waste water treatment unit, for example, step 2) in supplementary carbon source and basicity can be completed by the supplementary device in above-mentioned coal gasification waste water treatment unit, the coal gasification waste water treatment process that the embodiment of the present invention provides can utilize short-cut nitrification and denitrification principle synchronously to remove organism, ammonia nitrogen and total nitrogen, reduce oxygen than common denitrification process, the consumption of carbon source and basicity, shorten reaction mechanism, shorten the treatment time, hydraulic detention time is short, by the dissolved oxygen concentration in each bio-oxidation pond of Dissolved Oxygen concentration Control device control, realize the diversity of microorganism in different carriers, each quasi-microorganism is separately in favourable growing environment, under well-fed condition, keep very high biological activity, and in realizing short-cut nitrification and denitrification, guarantee ammonia nitrogen, effective removal of nitrite.
Concrete, step 2) in also comprise and adopt former moisture flow supplementary carbon source and basicity, former moisture flow to be specially independent shunting coal gasification waste water to the second bio-oxidation pond 32 and shunting coal gasification waste water to the three bio-oxidation ponds 33 separately.Take full advantage of carbon source limited in coal gasification waste water and basicity by multipoint water feeding, and, treatment time of coal gasification waste water further shortened.
Concrete, the coal gasification waste water that passes into the first bio-oxidation pond 31 accounts for 55%～60% of total coal gasification waste water, the coal gasification waste water that passes into the second bio-oxidation pond 32 accounts for 30%～35% of total coal gasification waste water, and the remainder in total coal gasification waste water passes in the 3rd bio-oxidation pond 33.According to the organic content in coal gasification waste water and basicity, and degree and basicity that in short-cut nitrification and denitrification reaction process, organism consumes, account for 55%～60% of total coal gasification waste water to pass into the coal gasification waste water of the first bio-oxidation pond 31, the coal gasification waste water that passes into the second bio-oxidation pond 32 accounts for 30%～35% of total coal gasification waste water, remainder in total coal gasification waste water passes in the 3rd bio-oxidation pond 33 is advisable, and guarantees that to the full extent organic content and the basicity in coal gasification waste water is fully utilized.
Embodiment 1:
The first bio-oxidation pond 31 equates with the volume of the second bio-oxidation pond 32, and the 3rd bio-oxidation pond 33 volumes account for 25% of device cubic capacity;
The first carrier 21, Second support 22 and the 3rd carrier 23 are urethane porous cubes, the first carrier 21 and the equal length of side of Second support 22 are 30mm, all pore diameter range is 1～4mm, the 3rd carrier 23 length of sides are 20mm, pore diameter range is 1～2mm, the 4th carrier 24 length of sides are 40mm, and aperture is 4～7mm;
In specific implementation process, coal gasification waste water is first through equalizing tank, the pre-treatment of physical chemistry settling tank is removed after partial suspended thing, through 1 point of three part of total water inlet, enter in proportion the first water-in 11 simultaneously, in the second water-in 12 and the 3rd water-in 13, wherein, enter into the first bio-oxidation pond 31 from the first water-in 11, enter into the second bio-oxidation pond 32 from the second water-in 12, enter into the 3rd bio-oxidation pond 33 from the 3rd water-in 13, finally, coal gasification waste water after treatment is by rising pipe 5 discharge systems, coal gasification waste water is uniflux in the process of aeration tube 6 continuous aerations, sludgd deposition is at sludge hopper 8, through the regular discharger of mud discharging mouth 9,
The coal gasification waste water that flows in proportion the first bio-oxidation pond 31 is 60% in total coal gasification waste water, the coal gasification waste water that flows into the second bio-oxidation pond 32 is in total coal gasification waste water to be 30%, and all the other coal gasification waste waters in total coal gasification waste water flow into the 3rd bio-oxidation ponds 33;
Carry air to each bio-oxidation pond by air compressor by aeration tube 6, in operational process by adjust aeration rate controlling the first bio-oxidation pond 31, the second bio-oxidation pond 32 dissolved oxygen concentrations are 1～1.5mg/L, the 3rd bio-oxidation pond 33 dissolved oxygen concentrations are 1.5～2.5mg/L.
In the present embodiment, the first bio-oxidation pond 31 and the second bio-oxidation pond 32 all keep pH value > 8, to be conducive to NO
2 -the accumulation of-N, multipoint water feeding can guarantee that the pH value of the first bio-oxidation pond 31, the second bio-oxidation pond 32 all maintains alkaline higher level, thereby suppresses NO
2 --N is to NO
3 -the conversion of-N.
In the first bio-oxidation pond 31, the second bio-oxidation pond 32, keep lower dissolved oxygen concentration, utilize the microorganism in the first carrier 21 to carry out short-cut nitrification and denitrification, nitration reaction is controlled to Nitrification Stage to remove the ammonia nitrogen in waste water, then utilize organism as electron donor, with NO
2 --N carries out denitrification as electron acceptor(EA) and removes total nitrogen and organism, and the coal gasification waste water flowing into from the first water-in 11 and the second water-in 12 can supplement the needed carbon source of biochemical reaction and basicity in time;
In the first bio-oxidation pond 31 and the second bio-oxidation pond 32, short-cut nitrification and denitrification is difficult to guarantee NH
4 +-N, NO
2 -the removal completely of-N, in the 3rd bio-oxidation pond 33, utilizes the microorganism in the 3rd carrier 23 to carry out denitrification, makes NO
2 --N reacts with the organism flowing into from the 3rd water-in 13, utilizes the further remaining NH of oxidation of microorganism in the 4th carrier 24
4 +-N and NO
2 --N, to guarantee effective removal of oxygen consumption inorganic nitrogen.
In the situation that hydraulic detention time is 52 hours, the water monitoring data in the present embodiment operation 18 days is as shown in table 1.
The water monitoring data of table 1 pilot scale run duration
| Water-quality guideline | Water inlet/(mgL -1） | Water outlet/(mgL -1） |
| NH 4 +-N | 189～306 | 1.4～3.6 |
| NO 2 --N | Do not survey | 0～0.03 |
| NO 3 --N | Do not survey | 1.1～4.2 |
| Total nitrogen | 235～381 | 4.5～9.6 |
| COD Cr | 675～953 | 16.3～26.5 |
| pH | 8.2～8.9 | 7.1～7.6 |
As can be seen from Table 1, the water quality of water outlet is highly stable, and has reached " urban wastewater treatment firm pollutant emission standard " one-level A standard-required in (GB18918-2002).
Embodiment 2:
The first bio-oxidation pond 31 equates with the volume of the second bio-oxidation pond 32, and the 3rd bio-oxidation pond 33 volumes account for 20% of device cubic capacity, and Dissolved Oxygen concentration Control device comprises aeration tube 6 and centrifugal fan;
The first carrier 21, Second support 22 and the 3rd carrier 23 are urethane porous cubes, the first carrier 21 and the equal length of side of Second support 22 are 30mm, all pore diameter range is 1～4mm, the 3rd carrier 23 length of sides are 20mm, pore diameter range is 1～2mm, the 4th carrier 24 length of sides are 40mm, and aperture is 4～7mm;
In specific implementation process, coal gasification waste water is first through equalizing tank, the pre-treatment of physical chemistry settling tank is removed after partial suspended thing, through 1 point of three part of total water inlet, enter in proportion the first water-in 11 simultaneously, in the second water-in 12 and the 3rd water-in 13, wherein, enter into the first bio-oxidation pond 31 from the first water-in 11, enter into the second bio-oxidation pond 32 from the second water-in 12, enter into the 3rd bio-oxidation pond 33 from the 3rd water-in 13, finally, coal gasification waste water after treatment is by rising pipe 5 discharge systems, coal gasification waste water is uniflux in the process of aeration tube 6 continuous aerations, sludgd deposition is at sludge hopper 8, through the regular discharger of mud discharging mouth 9,
The coal gasification waste water that flows in proportion the first bio-oxidation pond 31 is 60% in total coal gasification waste water, the coal gasification waste water that flows into the second bio-oxidation pond 32 is in total coal gasification waste water to be 35%, and all the other coal gasification waste waters in total coal gasification waste water flow into the 3rd bio-oxidation ponds 33;
In operational process, by adjusting aeration rate to control the first bio-oxidation pond 31, the second bio-oxidation pond 32 dissolved oxygen concentrations as 1～1.5mg/L, the 3rd bio-oxidation pond 33 dissolved oxygen concentrations are 1.5～2.5mg/L.
In the present embodiment, the first bio-oxidation pond 31 and the second bio-oxidation pond 32 all keep pH value > 8, to be conducive to NO
2 -the accumulation of-N, multipoint water feeding can guarantee that the first bio-oxidation pond 31, the second bio-oxidation pond 32pH value all maintain alkaline higher level, thereby suppresses NO
2 --N is to NO
3 -the conversion of-N.
In the first bio-oxidation pond 31, the second bio-oxidation pond 32, keep lower dissolved oxygen concentration, utilize the microorganism in the first carrier 21 to carry out short-cut nitrification and denitrification, nitration reaction is controlled to Nitrification Stage to remove the ammonia nitrogen in waste water, then utilize organism as electron donor, with NO
2 --N carries out denitrification as electron acceptor(EA) and removes total nitrogen and organism, and the coal gasification waste water flowing into from the first water-in 11 and the second water-in 12 can supplement the needed carbon source of biochemical reaction and basicity in time;
In the first bio-oxidation pond 31 and the second bio-oxidation pond 32, short-cut nitrification and denitrification is difficult to guarantee NH
4 +-N, NO
2 -the removal completely of-N, in the 3rd bio-oxidation pond 33, utilizes the microorganism in the 3rd carrier 23 to carry out denitrification, makes NO
2 --N reacts with the organism flowing into from the 3rd water-in 13, utilizes the further remaining NH of oxidation of microorganism in the 4th carrier 24
4 +-N and NO
2 --N, to guarantee effective removal of oxygen consumption inorganic nitrogen.
In the situation that hydraulic detention time is 58 hours, the water monitoring data in the present embodiment operation 61 days is as shown in table 2.
Water monitoring data during table 2 process operation
| Water-quality guideline | Water inlet/(mgL -1） | Water outlet/(mgL -1） |
| NH 4 +-N | 162～367 | 0.8～4.2 |
| NO 2 --N | Do not survey | 0～0.06 |
| NO 3 --N | Do not survey | 1.7～4.6 |
| Total nitrogen | 198～431 | 4.3～12.1 |
| COD Cr | 439～1021 | 13.2～21.5 |
| pH | 8.1～8.6 | 7.0～7.5 |
As can be seen from Table 2, the water quality of water outlet is highly stable, and has reached " urban wastewater treatment firm pollutant emission standard " one-level A standard-required in (GB18918-2002).
Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a coal gasification waste water treatment unit, it is characterized in that, comprise the first bio-oxidation pond (31) setting gradually, the second bio-oxidation pond (32) being communicated with described the first bio-oxidation pond (31) by first channel (41), the 3rd bio-oxidation pond (33) being communicated with described the second bio-oxidation pond (32) by second passage (42), supplementary device, total water inlet (1) and the Dissolved Oxygen concentration Control device for supplementary carbon source and basicity
Wherein, described the first bio-oxidation pond (31) is provided with from first water-in (11) of described total water inlet (1) shunting, for first carrier (21) of attached microbial with for limiting the first carrier stationary installation of described the first carrier (21) scope, described the first carrier (21) comprises that pore diameter range is a large amount of holes of 1mm-4mm
Described the second bio-oxidation pond (32) is provided with Second support (22) for attached microbial and for limiting the Second support stationary installation of described Second support (22) scope, described Second support (22) comprises that pore diameter range is a large amount of holes of 1mm-4mm
Described the 3rd bio-oxidation pond (33) be provided be arranged in order for the 3rd carrier (23) of attached microbial with for the 4th carrier (24) of attached microbial, also be provided with the 3rd carrier stationary installation for limiting described the 3rd carrier (23) scope and for limiting the 4th carrier stationary installation of described the 4th carrier (24) scope, described the 3rd carrier (23) comprises that pore diameter range is a large amount of holes of 1mm-2mm, described the 4th carrier (24) comprises that pore diameter range is a large amount of holes of 4mm-7mm
Described the 3rd bio-oxidation pond (33) is also provided with rising pipe (5),
Described supplementary device comprises the second water-in (12) and the 3rd water-in (13) shunted from described total water inlet (1),
Wherein, described the second water-in (12) is communicated with described the second bio-oxidation pond (32), and is positioned at the connectivity part of described the first bio-oxidation pond (31) and described the second bio-oxidation pond (32),
Described the 3rd water-in (23) is communicated with described the 3rd bio-oxidation pond (33), and is positioned at the connectivity part of described the second bio-oxidation pond (32) and described the 3rd bio-oxidation pond (33).
2. coal gasification waste water treatment unit according to claim 1, it is characterized in that, described the first bio-oxidation pond (31) equates with the volume of described the second bio-oxidation pond (32), and the volume of described the 3rd bio-oxidation pond (33) accounts for the cubic capacity that fills described the first bio-oxidation pond (31), described the second bio-oxidation pond (32) and (33) three bio-oxidation ponds of described the 3rd bio-oxidation pond
20%～25%。
3. coal gasification waste water treatment unit according to claim 1, it is characterized in that, described the first bio-oxidation pond (31), described the second bio-oxidation pond (32) and described the 3rd bio-oxidation pond (33) are provided with sludge hopper (8) and mud discharging mouth (9).
4. coal gasification waste water treatment unit according to claim 1, it is characterized in that, described the first water-in (11) is positioned at the top of described the first bio-oxidation pond (31), the bottom of described the first bio-oxidation pond (31) is communicated with the bottom of described the second bio-oxidation pond (32), the top of described the second bio-oxidation pond (32) is communicated with the top of described the 3rd bio-oxidation pond (33), described rising pipe
(5) be positioned at the bottom of described the 3rd bio-oxidation pond (33).
5. coal gasification waste water treatment unit according to claim 1, is characterized in that, described Dissolved Oxygen concentration Control device comprises aeration tube (6) and air generator (101).
6. coal gasification waste water treatment unit according to claim 1, is characterized in that, described the first carrier (21), described Second support (22) and described the 3rd carrier (23) are urethane porous cubes.
7. a coal gasification waste water treatment process, is characterized in that, comprising:
Step 1) is fixedly installed in the first bio-oxidation pond (31) has the first carrier (21) that pore diameter range is a large amount of holes of 1mm-4mm, and that described the first carrier (21) forms in the first bio-oxidation pond is aerobic, the combination of anoxic and anaerobic environment,
In the second bio-oxidation pond (32), be fixedly installed and have the Second support that pore diameter range is a large amount of holes of 1mm-4mm (22), that described Second support (22) forms in the second bio-oxidation pond (32) is aerobic, the combination of anoxic and anaerobic environment,
In the 3rd bio-oxidation pond (33), be arranged in order arrange have pore diameter range be 1mm-2mm a large amount of holes the 3rd carrier (23) and there is the 4th carrier (24) that pore diameter range is a large amount of holes of 4mm-7mm, wherein, the 3rd carrier (23) forms inner anaerobic environment, and described the 4th carrier (24) forms aerobic environment;
Step 2) coal gasification waste water is passed in described the first bio-oxidation pond (31), control described the first bio-oxidation pond (31) and described the second bio-oxidation pond (32) dissolved oxygen concentration remains on 1～1.5mg/L, control described the 3rd bio-oxidation pond (33) dissolved oxygen concentration and remain on 1.5～2.5mg/L, coal gasification waste water is passed to described the second bio-oxidation pond (32) from described the first bio-oxidation pond (31) and is passed to described the 3rd bio-oxidation pond (33) again and completes treating processes.
8. coal gasification waste water treatment process according to claim 7, it is characterized in that, described step 2) in also comprise and adopt former moisture flow supplementary carbon source and basicity, former moisture flow to be specially the described coal gasification waste water of independent shunting to described the second bio-oxidation pond (32) and extremely described the 3rd bio-oxidation pond (33) of the described coal gasification waste water of shunting separately.
9. coal gasification waste water treatment process according to claim 8, it is characterized in that, the coal gasification waste water that passes into described the first bio-oxidation pond (31) accounts for 55%～60% of total coal gasification waste water, the coal gasification waste water that passes into described the second bio-oxidation pond (32) accounts for 30%～35% of total coal gasification waste water, and the remainder in described total coal gasification waste water passes in described the 3rd bio-oxidation pond (33).
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| CN111018286A (en) * | 2019-12-27 | 2020-04-17 | 湖南军信环保股份有限公司 | Device and method for denitrifying anaerobic sludge digestion liquid |
| CN112147269B (en) * | 2020-09-30 | 2021-08-31 | 中国矿业大学(北京) | Laboratory analog simulation device for simulating gasification process of underground coal seam |
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