CN112759177A - Deep total nitrogen removal treatment process for industrial wastewater and nitrogen removal device thereof - Google Patents
Deep total nitrogen removal treatment process for industrial wastewater and nitrogen removal device thereof Download PDFInfo
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- CN112759177A CN112759177A CN202011400181.9A CN202011400181A CN112759177A CN 112759177 A CN112759177 A CN 112759177A CN 202011400181 A CN202011400181 A CN 202011400181A CN 112759177 A CN112759177 A CN 112759177A
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- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 47
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 67
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 55
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 52
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- 238000012856 packing Methods 0.000 claims abstract description 27
- 238000010992 reflux Methods 0.000 claims abstract description 23
- 239000002351 wastewater Substances 0.000 claims abstract description 22
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000003197 catalytic effect Effects 0.000 claims abstract description 19
- 238000005273 aeration Methods 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 6
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 37
- 239000005416 organic matter Substances 0.000 claims description 17
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 12
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 12
- 241001330002 Bambuseae Species 0.000 claims description 12
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 238000003763 carbonization Methods 0.000 claims description 8
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- 230000015556 catabolic process Effects 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- GFEWRKPOYXKQKX-UHFFFAOYSA-I [C+4].C(C)(=O)[O-].[Na+].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-] Chemical compound [C+4].C(C)(=O)[O-].[Na+].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-].C(C)(=O)[O-] GFEWRKPOYXKQKX-UHFFFAOYSA-I 0.000 claims description 4
- OHVGNSMTLSKTGN-BTVCFUMJSA-N [C].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O Chemical compound [C].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O OHVGNSMTLSKTGN-BTVCFUMJSA-N 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- QOTAEASRCGCJDN-UHFFFAOYSA-N [C].CO Chemical compound [C].CO QOTAEASRCGCJDN-UHFFFAOYSA-N 0.000 claims description 2
- 235000013312 flour Nutrition 0.000 claims description 2
- 230000000593 degrading effect Effects 0.000 claims 1
- 238000006396 nitration reaction Methods 0.000 description 10
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- 241000894006 Bacteria Species 0.000 description 6
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- 241000196324 Embryophyta Species 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 2
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- 239000002253 acid Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
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- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention relates to an industrial wastewater deep total nitrogen removal treatment process, which comprises the following steps: 1) industrial wastewater enters a pre-denitrification contact tank after passing through a mixer, water needs to be uniformly distributed in the tank, and meanwhile, combined filler is arranged in the tank; 2) the wastewater in the step 1) enters a carbon oxidation nitrification filter tank, an aeration device is arranged in the tank, and a biological ceramsite packing layer is arranged in the filter tank; 3) selecting a reflux ratio according to the reaction effluent in the step 2), refluxing the wastewater to the step 1), mixing the wastewater with the industrial wastewater to carry out primary total nitrogen removal, and feeding the residual wastewater into a post-denitrification filter; 4) a biological ceramsite packing layer is arranged in the post denitrification filter tank, and an external carbon source is added; 5) the effluent water of the step 4) enters a filter tank for disposal; 6) and 5) enabling the effluent to enter an ozone catalytic oxidation tank, and selectively starting. The invention also relates to a denitrification device for the treatment process, which can effectively solve the problem of deep denitrification in industrial wastewater.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to an industrial wastewater deep total nitrogen removal treatment process and a denitrification device thereof.
Background
With the gradual emphasis of the country on environmental pollution treatment and energy conservation and emission reduction, more total nitrogen indexes are emphasized, and many areas are listed as discharge real-time monitoring items, but most sewage treatment plants have poor effluent denitrification effect and high total nitrogen content, cannot meet the increasingly strict requirements of discharge standards, particularly in the field of industrial wastewater treatment, and the problem of total nitrogen removal is not considered in many plants before.
The biological nitrification and denitrification treatment is the most effective and economic method for removing total nitrogen, but the traditional biochemical contact oxidation reaction process has limited total nitrogen removal effect and is difficult to meet the requirement of advanced treatment, and partial municipal sewage plants use the biological filter tank process to carry out total nitrogen removal reaction and obtain certain effect, but the method still has a plurality of problems in industrial wastewater, such as overhigh pollutant concentration, limited removal effect, easy blockage of the filter tank and the like.
At present, how to develop an effective biological total nitrogen removal treatment process and achieve the requirement of deep total nitrogen removal are the directions which are urgently needed to be researched.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a process for deep total nitrogen removal treatment of industrial wastewater and a denitrification apparatus thereof, which solves the problem of deep denitrification in industrial wastewater.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, an embodiment of the present invention provides an industrial wastewater deep total nitrogen removal treatment process, including the following steps:
1) industrial wastewater enters a preposed denitrification contact tank after passing through a mixer, water is uniformly distributed in the tank, meanwhile, combined filler is arranged in the tank, and the industrial wastewater is subjected to preliminary total nitrogen removal reaction to obtain preposed reaction effluent;
2) leading the pre-reaction effluent in the step 1) to enter a carbon oxidation nitrification filter tank, wherein an aeration device is arranged in the carbon oxidation nitrification filter tank, a biological ceramsite packing layer is arranged in the filter tank, and the pre-reaction effluent completes carbonization and nitrification reaction of organic matters to obtain nitrified reaction effluent;
3) according to the content of nitrate nitrogen and total nitrogen components of inlet water in the reaction outlet water after nitrification in the step 2), selecting a reflux ratio, wherein the reflux ratio is 100-200% of the inlet water amount, the reaction outlet water after nitrification reflows to the step 1), mixing the reaction outlet water with the industrial wastewater, feeding the mixture into a mixer for preliminary total nitrogen removal, feeding the rest reaction outlet water after nitrification into a post-positioned denitrification filter for continuous total nitrogen degradation, and performing the step 4);
4) a biological ceramsite packing layer is arranged in the post-denitrification filter, and the nitrified reaction effluent entering the post-denitrification filter is subjected to denitrification reaction by adding an external carbon source, so that the deep total nitrogen removal of the wastewater is completed, and the denitrification reaction effluent is obtained;
5) treating the denitrification reaction effluent in the step 4) in a filter tank, and filtering out most suspended matters and colloidal particles to obtain filtered reaction effluent;
6) and (3) enabling the reaction effluent filtered in the step 5) to enter an ozone catalytic oxidation tank to serve as a safety measure for standard discharge of organic matters, and selectively starting.
According to the process, preferably, in the step 1), the pH value in the pre-denitrification contact tank is 6-9, the total nitrogen is less than 200mg/L, and the residence time of the industrial wastewater and the refluxed nitrified reaction effluent in the tank is 2-6 hours.
According to the process, preferably, the pH value in the carbon oxidation nitrification filter in the step 2) is 6-9, the dissolved oxygen is 2-8 mg/L, and the residence time of the pre-reaction effluent is 3-8 hours.
According to the process, preferably, in the step 4), the pH value in the post-denitrification filter is 6-9, the total nitrogen of the inlet water is less than 80mg/L, the retention time of the effluent after nitrification in the post-denitrification filter is 2-4 hours, and the total nitrogen of the effluent is less than 15 mg/L.
In the above process, preferably, the combined filler is a curtain-type biological combined filler or a suspended-type biological combined filler.
In the above process, preferably, in the step 1), when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are both high, no carbon source is added into the pre-denitrification contact tank, when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are both low, the reflux ratio in the step 3) is reduced, the carbon source addition is reduced, and when the nitrate nitrogen concentration of the incoming water is high and the organic matter content is low, the additional carbon source addition is increased.
In the above process, preferably, the carbon source is one or more of a sodium acetate carbon source, a glucose carbon source, a methanol carbon source or a flour carbon source.
In the above process, preferably, the bio-ceramsite packing layer is attached with a microbial flora.
In the process, the bamboo filament filler is arranged in the top of the pre-denitrification contact tank to degrade total nitrogen.
In a second aspect, an embodiment of the present invention provides a denitrification apparatus used in the above total nitrogen removal treatment process, where the denitrification apparatus includes a mixer, a pre-denitrification contact tank, a carbon oxidation nitrification filter, a post-denitrification filter, a filter tank, an ozone catalytic oxidation tank, a carbon source agent tank, and a centrifugal fan;
an inlet pipeline of the mixer is connected with a main water inlet pump, a bottom outlet pipeline of the mixer is connected with an inlet of the preposed denitrification contact tank, an outlet pipeline of the preposed denitrification contact tank is connected with an inlet of the carbon oxidation nitrification filter tank, the outlet pipelines of the carbon oxidation nitrification filter tank are divided into two pipelines, one pipeline is connected with the mixer through a nitrifying liquid reflux pump, the other pipeline is connected with an inlet of the postposition denitrification filter tank, an outlet pipeline of the postposition denitrification filter tank is connected with an inlet of the filter tank, and an outlet pipeline of the filter tank is connected with the ozone catalytic oxidation tank;
the outlet pipeline of the carbon source medicament tank is divided into two pipelines after passing through the carbon source medicament feeding pump, one pipeline is connected with the inlet of the mixer, and the other pipeline is connected with the inlet of the post denitrification filter;
the outlet of the centrifugal fan is connected with the bottom of the carbon oxidation nitrification filter; biological ceramsite packing layers are arranged in the carbon oxidation nitrification filter and the rear denitrification filter; an aeration device is arranged in the carbon oxidation nitrification filter;
the pre-denitrification contact tank is internally provided with a combined filler, and the top of the pre-denitrification contact tank is internally provided with a bamboo filament filler; biological ceramsite packing layers are arranged in the carbon oxidation nitrification filter tank and the rear denitrification filter tank, and microbial floras are attached to the biological ceramsite packing layers.
(III) advantageous effects
The invention has the beneficial effects that:
1) according to the water quality characteristics and the actual operation and production of the industrial wastewater, the system has strong adaptability, can flexibly carry out process allocation, has outstanding regulating capacity, and can naturally complete the denitrification process without adding a carbon source in the preposed denitrification stage to fully play the roles of all units if the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are higher; when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are lower, the reflux ratio can be reduced, the carbon source addition is reduced, the post denitrification is mainly utilized for total nitrogen removal reaction, and the cost is saved; when the concentration of nitrate nitrogen in the industrial wastewater is higher and the content of organic matters is lower, the investment of an external carbon source can be increased, the total nitrogen removal effect is improved, and the like.
2) The treatment process has good economical efficiency and high utilization rate of carbon source while meeting the requirement of wastewater treatment.
3) The operation is simple and convenient, the rear denitrification filter does not need frequent backwashing, and the full play can be realized.
4) The engineering investment cost is low, and the automation degree is high.
5) The bamboo filament filler is arranged in the top of the preposed denitrification contact tank, common moso bamboo in life is taken as the bamboo filament filler, the price is low, the surface hydrophilic group and the good biocompatibility are realized, the microbial film can be quickly formed, and the bamboo filament contains a large amount of organic carbon and can provide an electron donor for denitrifying bacteria. The bamboo filament filler and the combined filler are matched with each other, so that the total nitrogen depth can be effectively degraded, and the addition of a carbon source is reduced due to the existence of the bamboo filaments, so that the cost is saved.
The ceramic filler has excellent acid resistance and heat resistance, is durable and good in mass transfer performance, and microbial flora is properly attached to the ceramic filler for biochemical reaction to degrade a part of harmful substances in the sewage, and meanwhile, the biodegradability of the sewage is improved, and dissolved oxygen in the sewage is increased through an aeration system to provide nutrients for the microbial flora and stir mixed liquid.
6) The denitrification device realizes the grading treatment of total nitrogen by utilizing different structural forms of the preposed denitrification tank and the postposition denitrification tank, and has high treatment efficiency and good effect. The preposed denitrification contact tank adopts a curtain type or suspension type biological combined filler, has the characteristics of larger flux, difficult blockage, easy operation and management, suitability for treating high-concentration nitrogen-containing wastewater and the like, and the postposed denitrification contact tank adopts a biological filter form and has the characteristics of large biological carrier quantity, high treatment precision, capability of carrying out deep degradation of total nitrogen and the like.
Drawings
FIG. 1 is a flow chart of a process for deep total nitrogen removal treatment of industrial wastewater according to the present invention;
FIG. 2 is a schematic connection diagram of an industrial wastewater deep total nitrogen removal treatment device according to the present invention;
[ description of reference ]
1: a total water inlet pump; 2: a mixer; 3: a denitrification contact tank is arranged in front; 4: a carbon oxidation nitrification filter; 5: a denitrification filter tank is arranged at the rear; 6: a filtration tank; 7: an ozone catalytic oxidation tank; 8: a carbon source medicament tank; 9: a carbon source dosing pump; 10: a centrifugal fan; 11: a nitrifying liquid reflux pump; 12: combining fillers; 13: a biological ceramsite packing layer; 14: an aeration device.
Detailed Description
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1: referring to fig. 1, the invention provides a process for deeply removing total nitrogen from industrial wastewater, which comprises the following steps:
1) the industrial wastewater enters a preposed denitrification contact tank 3 after passing through a mixer 2, bamboo filament fillers are arranged in the top of the preposed denitrification contact tank 3, water needs to be uniformly distributed in the tank, and meanwhile, curtain type biological combined fillers are arranged in the tank.
In the step 1), when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are both high, the nitrate nitrogen concentration is more than 50mg/L, if the ratio of BOD5 (biochemical oxygen demand for five days) to TN (total nitrogen content) is more than 4, the wastewater can be regarded as an incoming water composition suitable for growth of denitrifying bacteria, no carbon source is added in the preposed denitrification contact tank, the denitrification process is naturally completed, and if the ratio of BOD5 to TN is less than 4, the carbon source is mainly added into the postposition denitrification filter tank;
when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are lower, the nitrate nitrogen concentration is lower than 50mg/L, the reflux ratio in the step 3) is reduced, the carbon source addition is reduced, and generally, the reflux ratio is controlled to be less than 1:1 so as to save the operation cost;
when the concentration of nitrate nitrogen in the industrial wastewater is high and the content of organic matters is low, and the total nitrogen concentration is more than 50mg/L and less than 100mg/L, the carbon source is mainly added into the post-positioned denitrification filter tank, the pre-positioned denitrification contact tank is used as an assistant, generally, when the total nitrogen concentration is more than 100mg/L, the carbon source is mainly added into the pre-positioned denitrification contact tank, and the post-positioned denitrification filter tank is used as an assistant.
When the organic matter concentration of the industrial wastewater is higher and the nitrate nitrogen concentration is lower, the nitrate nitrogen concentration is lower than 50mg/L, if the ratio of BOD5 to TN is greater than 4, no carbon source can be added into the preposed denitrification contact tank, the denitrification process is naturally completed, redundant organic matters are removed by the carbon oxidation nitrification filter tank and the subsequent ozone catalytic oxidation tank, and if the ratio of BOD5 to TN is less than 4, the carbon source is mainly added into the post-positioned denitrification filter tank. Generally, the ratio of BOD5 to TN in the wastewater is adjusted to be more than 4 by adding carbon sources.
The carbon source added in example 1 was a sodium acetate carbon source.
The industrial wastewater is subjected to primary total nitrogen removal reaction to obtain pre-reaction effluent, the pH value of the pre-denitrification tank in the step 1) is 6 when the pre-denitrification tank is adapted to the environment, the total nitrogen is 87mg/L, and the retention time is 3 hours.
2) The pre-reaction effluent in the step 1) enters a carbon oxidation nitrification filter, an aeration device is arranged in the filter, the aeration device in the invention provides oxygen and is generally connected with a centrifugal fan, compressed air provided by the centrifugal fan is changed into tiny bubbles through the aeration device and is released into water, and the oxygen is efficiently provided for microorganisms in the water. The biological ceramsite packing layer is arranged in the filter tank, the pre-reaction effluent completes carbonization and nitration of organic matters, in the process, biodegradable organic matters in the wastewater are basically removed, ammonia nitrogen in the total nitrogen is converted into nitrate nitrogen, and the reaction effluent after nitration is obtained. And (3) adapting the carbonization nitrification filter in the step 2) to the environment, wherein the pH value is 6, the dissolved oxygen is 2-8 mg/L, and the retention time is 4 hours.
3) According to the content of nitrate nitrogen and total nitrogen components of inlet water in the effluent water after nitration in the step 2), selecting a reflux ratio, refluxing the wastewater which is 100% of the inlet water amount to the step 1), mixing the wastewater with industrial wastewater to carry out primary total nitrogen removal, and allowing the residual nitration effluent water to enter a post-positioned denitrification filter tank to continue total nitrogen degradation for a step 4);
4) a biological ceramsite packing layer is arranged in the post denitrification filter tank, and a microbial flora is attached to the biological ceramsite packing layer. Adding an external carbon source, and carrying out denitrification reaction on the nitrified reaction effluent entering the post-denitrification filter tank to complete deep total nitrogen removal of the wastewater to obtain denitrification reaction effluent. Wherein the pH value of the post-denitrification filter adapting to the environment is 6, the total nitrogen of inlet water is 34mg/L, the retention time is 2 hours, and the total nitrogen of outlet water is 12 mg/L.
5) And 4) treating the denitrification reaction effluent in the step 4) in a filter tank, filtering most suspended matters and colloid particles to obtain filtered reaction effluent, wherein the filter tank contains fillers such as quartz sand/anthracite and the like, and the effluent of a biochemical system generally contains granular microorganism sludge and the like in order to filter suspended matters in wastewater.
6) And 5) reacting the filtered effluent to enter an ozone catalytic oxidation tank, serving as a safety measure for standard discharge of organic matters, and selectively starting.
In order to effectively carry out the total nitrogen removal process of denitrifying bacteria, a medicament, namely a carbon source, needs to be added into a system, the total nitrogen removal effect is poor when the carbon source is added too little, the total nitrogen of effluent does not reach the standard, and the COD of the effluent is increased when the carbon source is added too much, so that the water quality pollution is caused. Therefore, the ozone catalytic oxidation tank is added at the rear section of the system, if the biochemical system is not well controlled or the organic pollutants contained in the incoming water are high, the ozone catalytic oxidation tank can be opened to further degrade the organic pollutants, and when the front section system is well controlled or the quality of the incoming water is good, the power of the ozone catalytic oxidation tank can be reduced (or closed), so that the operation cost is saved.
Example 2: referring to fig. 1, the invention provides a process for deeply removing total nitrogen from industrial wastewater, which comprises the following steps:
1) industrial wastewater enters a preposed denitrification contact tank after passing through a mixer, bamboo filament filler is arranged in the top of the preposed denitrification contact tank, water needs to be uniformly distributed in the tank, meanwhile, suspended type biological combined filler is arranged in the tank, and industrial wastewater is subjected to preliminary total nitrogen removal reaction to obtain preposed reaction effluent. The preposed denitrification pool in the step 1) adapts to the environment with the pH value of 7, the total nitrogen is 124mg/L, and the retention time is 5 hours.
In the step 1), when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are high, the nitrate nitrogen concentration is more than 50mg/L, if the ratio of BOD5 to TN is more than 4, the composition of the incoming water is considered to be suitable for the growth of denitrifying bacteria, no carbon source is added into the preposed denitrification contact tank, the denitrification process is naturally completed, and if the ratio of BOD5 to TN is less than 4, the carbon source is mainly added into the postposition denitrification filter tank;
when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are lower, the nitrate nitrogen concentration is lower than 50mg/L, the reflux ratio in the step 3) is reduced, and the carbon source addition is reduced;
when the concentration of nitrate nitrogen in the industrial wastewater is high and the content of organic matters is low, and the total nitrogen concentration is more than 50mg/L and less than 100mg/L, the carbon source is mainly added into the post-positioned denitrification filter tank, the pre-positioned denitrification contact tank is used as an assistant, generally, when the total nitrogen concentration is more than 100mg/L, the carbon source is mainly added into the pre-positioned denitrification contact tank, and the post-positioned denitrification filter tank is used as an assistant.
When the organic matter concentration of the industrial wastewater is higher and the nitrate nitrogen concentration is lower, the nitrate nitrogen concentration is lower than 50mg/L, if the ratio of BOD5 to TN is greater than 4, no carbon source can be added into the preposed denitrification contact tank, the denitrification process is naturally completed, redundant organic matters are removed by the carbon oxidation nitrification filter tank and the subsequent ozone catalytic oxidation tank, and if the ratio of BOD5 to TN is less than 4, the carbon source is mainly added into the post-positioned denitrification filter tank.
The carbon source in example 2 is a sodium acetate carbon source, and sodium acetate is mainly used as the carbon source because sodium acetate can be directly utilized by denitrifying bacteria, and the effect is obviously better than other carbon sources.
2) And (2) leading the pre-reaction effluent in the step 1) to enter a carbon oxidation nitrification filter, wherein an aeration device is arranged in the filter, a biological ceramsite packing layer is arranged in the filter, and a microbial flora is attached to the biological ceramsite packing layer.
The pre-reaction effluent completes carbonization and nitration of organic matters, in the process, all biodegradable organic matters in the pre-reaction effluent are removed, and ammonia nitrogen in total nitrogen is converted into nitrate nitrogen to obtain the nitration reaction effluent.
3) According to the nitrate nitrogen content and the total nitrogen component of the inlet water of the effluent after nitration in the step 2), selecting a reflux ratio, refluxing the wastewater which is 150% of the inlet water amount to the step 1), mixing the wastewater with industrial wastewater, feeding the wastewater into a mixer for primary total nitrogen removal, and feeding the residual nitration effluent into a post-positioned denitrification filter 5) for continuous total nitrogen degradation. And (3) adapting the carbonization nitrification filter in the step 2) to the environment, wherein the pH value is 7, the dissolved oxygen is 2-8 mg/L, and the retention time is 6 hours.
4) A biological ceramsite packing layer is arranged in the post-denitrification filter, and the nitrified reaction effluent entering the post-denitrification filter is subjected to denitrification reaction by adding an external carbon source, so that the deep total nitrogen removal of the wastewater is completed, and the denitrification reaction effluent is obtained. The post denitrification filter tank in the step 4) adapts to the environment with the pH value of 7, the total nitrogen of inlet water is 42mg/L, the retention time is 3 hours, and the total nitrogen of outlet water is 12 mg/L.
5) And 4) treating the denitrification reaction effluent in the step 4) in a filter tank, and filtering out most suspended matters and colloidal particles to obtain filtered reaction effluent.
6) And 5) reacting the filtered effluent to enter an ozone catalytic oxidation tank, serving as a safety measure for standard discharge of organic matters, and selectively starting.
Example 3: referring to fig. 1, the invention provides a process for deeply removing total nitrogen from industrial wastewater, which comprises the following steps:
1) industrial wastewater enters a preposed denitrification contact tank after passing through a mixer, water needs to be uniformly distributed in the tank, meanwhile, a suspended biological combined filler is arranged in the tank, and the industrial wastewater is subjected to preliminary total nitrogen removal reaction to obtain preposed reaction effluent. The pre-denitrification pool in the step 1) adapts to the environment with the pH value of 9, the total nitrogen is 151mg/L, and the retention time is 6 hours.
2) And (2) leading the pre-reaction effluent in the step 1) to enter a carbon oxidation nitrification filter, wherein an aeration device is arranged in the filter, a biological ceramsite packing layer is arranged in the filter, microbial flora is attached to the biological ceramsite packing layer, and the wastewater completes carbonization and nitrification reaction of organic matters.
In the step 1), when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are high, the nitrate nitrogen concentration is more than 50mg/L, if the ratio of BOD5 to TN is more than 4, the composition of the incoming water is considered to be suitable for the growth of denitrifying bacteria, no carbon source is added into the preposed denitrification contact tank, the denitrification process is naturally completed, and if the ratio of BOD5 to TN is less than 4, the carbon source is mainly added into the postposition denitrification filter tank;
when the organic matter content and the nitrate nitrogen concentration of the industrial wastewater are lower, the nitrate nitrogen concentration is lower than 50mg/L, the reflux ratio in the step 3) is reduced, and the carbon source addition is reduced;
when the concentration of nitrate nitrogen in the industrial wastewater is high and the content of organic matters is low, and the total nitrogen concentration is more than 50mg/L and less than 100mg/L, the carbon source is mainly added into the post-positioned denitrification filter tank, the pre-positioned denitrification contact tank is used as an assistant, generally, when the total nitrogen concentration is more than 100mg/L, the carbon source is mainly added into the pre-positioned denitrification contact tank, and the post-positioned denitrification filter tank is used as an assistant.
When the organic matter concentration of the industrial wastewater is higher and the nitrate nitrogen concentration is lower, the nitrate nitrogen concentration is lower than 50mg/L, if the ratio of BOD5 to TN is greater than 4, no carbon source can be added into the preposed denitrification contact tank, the denitrification process is naturally completed, redundant organic matters are removed by the carbon oxidation nitrification filter tank and the subsequent ozone catalytic oxidation tank, and if the ratio of BOD5 to TN is less than 4, the carbon source is mainly added into the post-positioned denitrification filter tank.
The carbon source in example 3 was a glucose carbon source.
3) According to the content of nitrate nitrogen in the effluent and the total nitrogen component of the influent water after nitration in the step 2), selecting a reflux ratio, refluxing the wastewater which is 200 percent of the influent water to the step 1), mixing the wastewater with industrial wastewater to carry out primary total nitrogen removal, and allowing the residual nitration effluent to enter a post-positioned denitrification filter tank for continuous total nitrogen degradation. And (3) adapting the carbonization nitrification filter in the step 2) to the environment, wherein the pH value is 9, the dissolved oxygen is 2-8 mg/L, and the retention time is 8 hours.
4) A biological ceramsite packing layer is arranged in the post-denitrification filter, and the nitrified reaction effluent entering the post-denitrification filter is subjected to denitrification reaction by adding an external carbon source, so that the deep total nitrogen removal of the wastewater is completed, and the denitrification reaction effluent is obtained.
5) And 4) treating the denitrification reaction effluent in the step 4) in a filter tank, and filtering out most suspended matters and colloidal particles to obtain filtered reaction effluent. The post denitrification filter tank in the step 4) adapts to the environment with the pH value of 9, the total nitrogen of inlet water is less than 56mg/L, the retention time is 4 hours, and the total nitrogen of outlet water is 14 mg/L.
6) And 5) reacting the filtered effluent to enter an ozone catalytic oxidation tank, serving as a safety measure for standard discharge of organic matters, and selectively starting.
Referring to fig. 2, the device for removing total nitrogen comprises a mixer 2, a front denitrification contact tank 3, a carbon oxidation nitrification filter 4, a rear denitrification filter 5, a filter tank 6, an ozone catalytic oxidation tank 7, a carbon source agent tank 8 and a centrifugal fan 10;
an inlet pipeline of the mixer 2 is connected with the main water inlet pump 1, an outlet pipeline at the bottom of the mixer 2 is connected with an inlet of the preposed denitrification contact tank 3, an outlet pipeline of the preposed denitrification contact tank 3 is connected with an inlet of the carbon oxidation nitrification filter tank 4, the outlet pipeline of the carbon oxidation nitrification filter tank 4 is divided into two pipelines, one pipeline is connected with the mixer 2 through a nitrification liquid reflux pump 11, the other pipeline is connected with an inlet of the postposition denitrification filter tank 5, an outlet pipeline of the postposition denitrification filter tank 5 is connected with an inlet of the filter tank 6, and an outlet pipeline of the filter tank 6 is connected with the ozone catalytic oxidation tank 7. The outlet pipeline of the carbon source medicament tank 8 is divided into two pipelines after passing through the carbon source medicament feeding pump 9, one pipeline is connected with the inlet of the mixer 2, and the other pipeline is connected with the inlet of the post-denitrification filter 5.
The outlet of the centrifugal fan 10 is connected with the bottom of the carbon oxidation nitrification filter 4; biological ceramsite packing layers 13 are arranged in the carbon oxidation nitrification filter 4 and the post-positioned denitrification filter 5; an aeration device 14 is arranged in the carbon oxidation nitrification filter 4; the preposed denitrification contact tank 3 is internally provided with a combined filler 12, and the combined filler 12 comprises a curtain type biological combined filler and a suspended type biological combined filler. Bamboo filament filling materials are arranged in the top of the preposed denitrification contact tank 3; and biological ceramsite packing layers 13 are arranged in the carbon oxidation nitrification filter 4 and the post-denitrification filter 5, and microbial floras are attached to the biological ceramsite packing layers 13.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The deep total nitrogen removal treatment process for industrial wastewater is characterized by comprising the following steps of:
1) industrial wastewater enters a preposed denitrification contact tank after passing through a mixer, water is uniformly distributed in the tank, meanwhile, a combined filler is arranged in the tank, and the industrial wastewater undergoes a preliminary total nitrogen removal reaction through the combined filler to obtain preposed reaction effluent;
2) leading the pre-reaction effluent in the step 1) to enter a carbon oxidation nitrification filter tank, wherein an aeration device is arranged in the carbon oxidation nitrification filter tank, a biological ceramsite packing layer is arranged in the filter tank, and the pre-reaction effluent completes carbonization and nitrification reaction of organic matters to obtain nitrified reaction effluent;
3) according to the content of nitrate nitrogen and total nitrogen components of inlet water in the reaction outlet water after nitrification in the step 2), selecting a reflux ratio, wherein the reflux ratio of the nitrification reaction outlet water which is 100-200% of the inlet water amount is refluxed to the step 1), mixing the nitrification reaction outlet water with newly-entered industrial wastewater, entering a mixer for performing primary total nitrogen removal in the step 1), and entering the rest nitrification reaction outlet water into a post-positioned denitrification filter for continuing total nitrogen degradation and performing a step 4);
4) a biological ceramsite packing layer is arranged in the post-denitrification filter, and the nitrified reaction effluent entering the post-denitrification filter is subjected to denitrification reaction by adding an external carbon source, so that the deep total nitrogen removal of the wastewater is completed, and the denitrification reaction effluent is obtained;
5) and 4) treating the denitrification reaction effluent in the step 4) in a filter tank, and filtering out most suspended matters and colloidal particles to obtain filtered reaction effluent.
6) And 5) reacting the filtered effluent to enter an ozone catalytic oxidation tank, serving as a safety measure for standard discharge of organic matters, and selectively starting.
2. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein: the pH value in the preposed denitrification contact tank in the step 1) is 6-9, the total nitrogen is less than 200mg/L, and the retention time of the industrial wastewater and the refluxed nitrified reaction effluent in the tank is 2-6 hours.
3. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein: the pH value in the carbon oxidation nitrification filter in the step 2) is 6-9, the dissolved oxygen is 2-8 mg/L, and the residence time of the effluent of the pre-reaction is 3-8 hours.
4. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein: the pH value in the post-denitrification filter tank in the step 4) is 6-9, the total nitrogen of the inlet water is less than 80mg/L, the retention time of the reacted outlet water after nitrification in the post-denitrification filter tank is 2-4 hours, and the total nitrogen of the outlet water is less than 15 mg/L.
5. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein: the combined filler is curtain type biological combined filler or suspended type biological combined filler.
6. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein:
in the step 1), when the organic matter content and the nitrate nitrogen concentration in the industrial wastewater are both high, no carbon source is added into the preposed denitrification contact tank, when the organic matter content and the nitrate nitrogen concentration in the industrial wastewater are both low, the reflux ratio in the step 3) is reduced, the carbon source adding is reduced, and when the nitrate nitrogen concentration in the incoming water is high and the organic matter content is low, the additional carbon source adding is increased.
7. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein: the carbon source is one or more of a sodium acetate carbon source, a glucose carbon source, a methanol carbon source or a flour carbon source.
8. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein: and the biological ceramsite packing layer is attached with a microbial flora.
9. The process for deeply removing total nitrogen from industrial wastewater as claimed in claim 1, wherein: and a bamboo filament filler is arranged in the top of the preposed denitrification contact tank for degrading total nitrogen.
10. The denitrification apparatus for the total nitrogen removal treatment process according to any one of claims 1 to 9, wherein: the denitrification device comprises a mixer (2), a front denitrification contact tank (3), a carbon oxidation nitrification filter (4), a rear denitrification filter (5), a filter tank (6), an ozone catalytic oxidation tank (7), a carbon source agent tank (8) and a centrifugal fan (10); wherein,
an inlet pipeline of the mixer (2) is connected with a main water inlet pump (1), an outlet pipeline at the bottom of the mixer (2) is connected with an inlet of the front denitrification contact tank (3), an outlet pipeline of the front denitrification contact tank (3) is connected with an inlet of the carbon oxidation nitrification filter tank (4), the outlet pipeline of the carbon oxidation nitrification filter tank (4) is divided into two pipelines, one pipeline is connected with the mixer (2) through a nitrification liquid reflux pump (11), the other pipeline is connected with an inlet of the rear denitrification filter tank (5), an outlet pipeline of the rear denitrification filter tank (5) is connected with an inlet of the filter tank (6), and an outlet pipeline of the filter tank (6) is connected with the ozone catalytic oxidation tank (7);
the outlet pipeline of the carbon source medicament tank (8) is divided into two pipelines after passing through a carbon source medicament feeding pump (9), one pipeline is connected with the inlet of the mixer (2), and the other pipeline is connected with the inlet of the post-denitrification filter (5);
the outlet of the centrifugal fan (10) is connected with the bottom of the carbon oxidation nitrification filter (4); biological ceramsite packing layers (13) are arranged in the carbon oxidation nitrification filter (4) and the rear denitrification filter (5); an aeration device (14) is arranged in the carbon oxidation nitrification filter (4);
a combined filler (12) is arranged in the preposed denitrification contact tank (3), and a bamboo filament filler is arranged in the top of the preposed denitrification contact tank (3); biological ceramsite packing layers (13) are arranged in the carbon oxidation nitrification filter (4) and the rear denitrification filter (5), and microbial floras are attached to the biological ceramsite packing layers (13).
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