CN110759607A - Process for removing total nitrogen from printing and dyeing wastewater - Google Patents
Process for removing total nitrogen from printing and dyeing wastewater Download PDFInfo
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- CN110759607A CN110759607A CN201911201486.4A CN201911201486A CN110759607A CN 110759607 A CN110759607 A CN 110759607A CN 201911201486 A CN201911201486 A CN 201911201486A CN 110759607 A CN110759607 A CN 110759607A
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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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
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/341—Consortia of bacteria
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/347—Use of yeasts or fungi
Abstract
The invention discloses a total nitrogen removal process for printing and dyeing wastewater, which relates to the technical field of wastewater treatment and comprises the following process steps: s1: introducing the printing and dyeing wastewater into a grid well to remove large particles; s2: introducing the waste water passing through the grid well into a regulating tank for homogenizing and equalizing; s3: carrying out biological contact oxidation reaction on the wastewater passing through the regulating tank in an anaerobic tank, wherein denitrifying bacteria are added in the anaerobic tank; s4: carrying out aerobic biochemical reaction on the wastewater treated by the anaerobic tank through an aerobic tank, wherein nitrobacteria and composite strains are added into the aerobic tank; s5: performing solid-liquid separation on the wastewater treated by the aerobic tank through a secondary sedimentation tank, introducing the separated supernatant into a disinfection tank for sterilization treatment, and refluxing the residual sludge into the anaerobic tank in the step S2; s6: the wastewater treated by the disinfection tank can be discharged after being detected to be qualified. The invention has the advantage of improving the sewage treatment efficiency of nitrobacteria.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a total nitrogen removal process for printing and dyeing wastewater.
Background
The pollution in the printing and dyeing industry is mainly concentrated in waste water, the printing and dyeing waste water mainly contains various organic auxiliary agents remained in the printing and dyeing process, and the content of ammonia nitrogen is high, so that the treatment and discharge of the printing and dyeing waste water are problems which need to be paid attention to by each printing and dyeing mill.
In the existing printing and dyeing wastewater treatment, ammonia nitrogen is mainly removed by an A/O biological contact oxidation process. The A/O biological contact oxidation process mainly comprises an anoxic section and an aerobic section, wherein ammonia nitrogen organic matters and nitrate-state ammonia nitrogen in the wastewater are firstly subjected to anaerobic reaction of denitrifying bacteria in an anoxic environment to denitrify nitrate-state ammonia nitrogen wastes into nitrogen to be removed, the rest ammonia nitrogen organic matters are subjected to aerobic treatment of nitrifying bacteria in the aerobic section, organic ammonia nitrogen is oxidized into nitrate-state ammonia nitrogen and then flows back to the anoxic section to be removed through denitrification, and therefore the total nitrogen content in the wastewater is reduced to reach the discharge standard.
The above prior art solutions have the following drawbacks: generally, the total nitrogen removal efficiency in the A/O biological contact oxidation process is influenced by the concentration of impurities except ammonia nitrogen in the wastewater, the printing and dyeing wastewater contains various impurities besides ammonia nitrogen pollutants, and harmful components in the impurities, such as bacteria harmful to nitrifying bacteria and denitrifying bacteria, exist in the printing and dyeing wastewater, so that the conventional A/O biological contact oxidation process needs a long cycle time for removing the total nitrogen in the printing and dyeing wastewater, the treatment efficiency is too low, and the consumption cost is too high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a process for removing the total nitrogen in the printing and dyeing wastewater, wherein nitrobacteria are protected by adding compound strains, so that harmful bacteria and harmful substances in the wastewater have small influence on the nitrobacteria.
The above object of the present invention is achieved by the following technical solutions:
a total nitrogen removal process for printing and dyeing wastewater comprises the following process steps:
s1: introducing the printing and dyeing wastewater into a grid well to remove large particles;
s2: introducing the waste water passing through the grid well into a regulating tank for homogenizing and equalizing;
s3: carrying out biological contact oxidation reaction on the wastewater passing through the regulating tank in an anaerobic tank, wherein denitrifying bacteria are added in the anaerobic tank;
s4: carrying out aerobic biochemical reaction on the wastewater treated by the anaerobic tank through an aerobic tank, wherein nitrobacteria and composite strains are added into the aerobic tank;
s5: performing solid-liquid separation on the wastewater treated by the aerobic tank through a secondary sedimentation tank, introducing the separated supernatant into a disinfection tank for sterilization treatment, and refluxing the residual sludge into the anaerobic tank in the step S2;
s6: the wastewater treated by the disinfection tank can be discharged after being detected to be qualified.
Through adopting above-mentioned technical scheme, printing and dyeing waste water gets rid of large granule impurity through the grid earlier, gets into the regulation of carrying out homogeneity and average volume in the equalizing basin again, adjusts the quality of water and the water yield of sewage to the reaction of the bacterial of adaptation follow-up anaerobism pond and good oxygen pond. Denitrifying bacteria are added into the anaerobic tank and nitrifying bacteria added into the aerobic tank react with the sewage, so that nitrogen-containing pollutants such as organic nitrogen oxides, inorganic nitrate and the like in the sewage are removed. Meanwhile, the composite strain is added in the aerobic tank in addition to the nitrifying bacteria, and the composite strain protects the nitrifying bacteria in the aerobic tank, so that the nitrifying bacteria can be prevented from being influenced by harmful bacteria in sewage. And the addition of the composite strain can improve the growth and reproduction speed of the nitrifying bacteria and further improve the implementation of the nitrification reaction.
The invention is further configured to: a pretreatment tank is arranged between the regulating tank in the step S2 and the anaerobic tank in the step S3, a pretreatment agent is added into the pretreatment tank, and the pretreatment agent comprises the following components in parts by weight:
10-60 parts of 2-phosphonic butane-1, 2, 4-tricarboxylic acid;
15-80 parts of an alkaline assistant;
160-240 parts of water.
By adopting the technical scheme, the 2-phosphonic butane-1, 2, 4-tricarboxylic acid is added in the pretreatment tank, and the 2-phosphonic butane-1, 2, 4-tricarboxylic acid can be complexed with metal ions, heavy metal ions and the like in the sewage in the presence of an alkaline assistant, so that the influence of the heavy metal ions in the sewage on nitrifying bacteria and denitrifying bacteria is reduced, the heavy metal ions and the like on the nitrifying bacteria and the denitrifying bacteria are avoided, and the complexed metal ions can avoid the phenomena of scaling and the like in a sewage flowing pipeline in the circulating process.
The invention is further configured to: the composite strains added in the aerobic tank in the step S4 comprise the following components in percentage by weight:
by adopting the technical scheme, as the nitrobacteria are slowly propagated, nutrient substances and propagation positions in the sludge are easily contested by bacteria in the sewage just after the strains are added into the sewage, so that the propagation conditions of the nitrobacteria are worsened and the nitrobacteria are more slowly propagated. When the microzyme and the lactic acid bacteria added in the bacteria and the nitrobacteria are added together, the three have good synergistic effect, the propagation of the microzyme with aerobic effect is faster, the nitrobacteria can be helped to preempt a certain propagation space in the sludge, and the lactic acid bacteria can kill harmful bacteria which have competition effect with the nitrobacteria, so that the nitrobacteria can be helped to grow and propagate more smoothly.
A small amount of filamentous bacteria are added in the strain, and the filamentous bacteria have the function of serving as a framework of the sludge so as to improve the bonding strength of the activated sludge and are not easy to be dispersed by water flow. The acinetobacter added in the strain has a decomposition effect on phosphorus components in the sewage, and the thiobacillus has a decomposition effect on sulfur components in the sewage, so that the denitrification fungicide can treat the sewage more comprehensively due to the addition of the auxiliary strain.
The invention is further configured to: when the wastewater is refluxed in the step S4, adding an organic carbon source supplement into the refluxed wastewater, wherein the organic carbon source supplement comprises the following components in percentage by weight:
30-50% of glucose;
20-30% of methanol;
20-40% of water.
By adopting the technical scheme, the water solution prepared from the glucose and the methanol in the organic carbon source supplement can supplement the carbon source consumed by the nitrifying bacteria and the denitrifying bacteria in the process of reacting the sewage, so that the nitrifying bacteria and the denitrifying bacteria can obtain sufficient nutrition in the circulating treatment process of the sewage to supply the growth, the propagation and the metabolism of the nitrifying bacteria and the denitrifying bacteria.
The invention is further configured to: an oxygen slow release agent is also added into the organic carbon source supplementing machine, and comprises the following components in percentage by weight:
by adopting the technical scheme, the polylactic acid in the oxygen slow-release agent is used as the embedding agent to slowly release the powder CaO generating oxygen2And (4) coating to obtain a slow release system. The polylactic acid is a hydrophobic material, and no water is added in the process of embedding the polylactic acid to obtain a slow-release system, so that the CaO powder used for generating oxygen is CaO2The CaO powder is not easy to react with water, so that the CaO powder is CaO powder2The amount of effective oxygen to be slowly released decreases. When the polylactic acid is used as an embedding agent, the biodegradability of the polylactic acid is good, and the polylactic acid can provide a high-quality co-metabolism carbon source for the growth and the propagation of microorganisms.
The quartz sand in the oxygen slow-release agent is used for increasing the weight of the desulfurization microbial inoculum, so that the desulfurization microbial inoculum is not easy to stay in the wastewater for too short time due to the fact that the buoyancy is larger than the gravity, and the desulfurization efficiency is reduced. When the carbon tetrachloride is used for preparing the oxygen slow-release agent, the carbon tetrachloride is used as a solvent and plays a role in dissolving the embedding agent, so that the CaO powder is obtained2Can be dispersed in the embedding process, and uses carbon tetrachloride as a solvent, so that the whole system does not add water in the preparation process, thereby improving the CaO content of the powder2The utilization ratio of (2).
The invention is further configured to: the oxygen slow release agent is also added with charcoal powder loaded with iron ions, and comprises the following components in percentage by weight:
by adopting the technical scheme, the charcoal powder has a certain adsorption effect, can adsorb partial impurity organic matters in sewage, has a certain photocatalytic activity after being loaded with iron ions, and can carry out certain photocatalytic degradation on the organic matters under the action of ultraviolet light. Meanwhile, the addition of the charcoal powder can improve the mechanical strength of the oxygen sustained release agent to a certain extent and prolong the oxygen sustained release period of the oxygen sustained release agent.
The invention is further configured to: KH is also added into the oxygen slow-release agent2PO4The oxygen slow release agent comprises the following components in percentage by weight:
by adopting the technical scheme, the CaO powder is obtained in the process of releasing oxygen by the oxygen sustained release agent2Calcium hydroxide is generated, the pH value of the microenvironment is increased due to the calcium hydroxide, the activity of the Thiobacillus, the Pseudomonas and the Acinetobacter in the composite microbial inoculum is influenced due to the increase of the pH value, and the growth and metabolism of the strains are also not facilitated. KH added in oxygen slow-release agent2PO4Can release H in water+Neutralizing OH liberated from calcium hydroxide-Ions, thereby providing stable pH conditions for subsequent oxidation and other processes of the strains.
Compared with the prior art, the invention has the beneficial effects that:
1. by adding the composite strain, the composite strain can protect nitrobacteria when sewage flows through the aerobic tank, promote the growth and the propagation of the nitrobacteria, improve the metabolic capability and enable the sewage treatment to be more efficient;
2. the oxygen content in the aerobic tank is improved by adding the oxygen slow-release agent, so that the oxygen consumed by the nitrobacteria in the growth and reproduction process can be supplemented in time, and the nitrification of the nitrobacteria is improved.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1:
the invention discloses a total nitrogen removal process for printing and dyeing wastewater, which comprises the following process steps:
s1: introducing the printing and dyeing wastewater into a grid well to remove large particles;
s2: introducing the waste water passing through the grid well into a regulating tank for homogenizing and equalizing;
s3: introducing the sewage after passing through the regulating tank into a pretreatment tank for pretreatment, wherein a pretreatment agent is added into the pretreatment tank, and the pretreatment agent comprises the following components in parts by weight:
10 parts of 2-phosphonic butane-1, 2, 4-tricarboxylic acid;
15 parts of an alkaline assistant;
160 parts of water.
The alkaline auxiliary agent adopts sodium hydroxide solution with the mass concentration of 20%.
S4: carrying out biological contact oxidation reaction on the wastewater passing through the regulating tank in an anaerobic tank, wherein denitrifying bacteria are added in the anaerobic tank;
s5: carrying out aerobic biochemical reaction on the wastewater treated by the anaerobic tank through an aerobic tank, wherein nitrobacteria and composite strains are added into the aerobic tank;
s6: performing solid-liquid separation on the wastewater treated by the aerobic tank through a secondary sedimentation tank, introducing the separated supernatant into a disinfection tank for sterilization treatment, refluxing the residual sludge into the anaerobic tank in the step S2, and adding an organic carbon source supplement into the refluxed wastewater;
s7: the wastewater treated by the disinfection tank can be discharged after being detected to be qualified.
The composite strain comprises the following components in percentage by weight:
the organic carbon source supplement comprises the following components in percentage by weight:
the oxygen slow release agent comprises the following components in percentage by weight:
the difference between the embodiments 2-5 and the embodiment 1 is that the pretreatment auxiliary agent comprises the following components in parts by weight.
Examples 6-15 differ from example 1 in that the composite bacterial species are listed in the following table in weight percent.
The difference between the examples 16-19 and the example 1 is that the components of the oxygen slow release agent are as follows by weight percentage.
The difference between the examples 20-23 and the example 1 is that the components of the oxygen slow release agent are as follows by weight percentage.
Comparative example
Comparative example 1 differs from example 1 in that no complex strain is added;
comparative example 2 differs from example 1 in that no oxygen-delaying agent is added;
comparative example 3 differs from example 1 in that pretreatment was carried out without adding a pretreatment agent.
Detection method
Taking 8L of sewage from the same batch of sewage to be treated, equally dividing the sewage into 4 samples, taking half of the samples in each sample to test the COD value, and respectively recording the rest samples as a sample A, a sample B, a sample C and a sample D. Then, the granulated sludge obtained in example 1 was added to sample A, the granulated sludge obtained in comparative example 1 was added to sample B, the granulated sludge obtained in comparative example 2 was added to sample C, the granulated sludge obtained in comparative example 3 was added to sample D, the amount of the added granulated sludge was 10g, and after 0.5 hour of treatment, the content of ammonia nitrogen remaining in sample A, B, C, D was measured, and the results are shown in the following table.
| Group of | Initial COD value (mg/L) | Final COD value (mg/L) |
| Sample A | 478 | 215 |
| Sample B | 477 | 343 |
| Sample C | 481 | 275 |
| Sample D | 479 | 240 |
And (4) conclusion: through the test of last table, according to sample A respectively with the test result contrast of sample B and C, can see out in the sample A because increased compound bacterial more than sample B for nitrobacteria in the sample A can more quick growth breed in the earlier stage, improve to the treatment effect of sewage, the treatment effeciency accelerates, thereby show the COD value sample A in the sewage sample after 0.5h handles to be far less than sample B from the result. And the comparison of the sample A and the sample C and the comparison of the sample B and the sample C and the sample D show that the oxygen slow-release agent can supplement oxygen in the sewage and complex heavy metal ions and the like in the sewage through a pretreatment machine, so that the growth and reproduction conditions of nitrobacteria are improved, and the sewage treatment efficiency is improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. The total nitrogen removal process for the printing and dyeing wastewater is characterized by comprising the following process steps:
s1: introducing the printing and dyeing wastewater into a grid well to remove large particles;
s2: introducing the waste water passing through the grid well into a regulating tank for homogenizing and equalizing;
s3: carrying out biological contact oxidation reaction on the wastewater passing through the regulating tank in an anaerobic tank, wherein denitrifying bacteria are added in the anaerobic tank;
s4: carrying out aerobic biochemical reaction on the wastewater treated by the anaerobic tank through an aerobic tank, wherein nitrobacteria and composite strains are added into the aerobic tank;
s5: performing solid-liquid separation on the wastewater treated by the aerobic tank through a secondary sedimentation tank, introducing the separated supernatant into a disinfection tank for sterilization treatment, and refluxing the residual sludge into the anaerobic tank in the step S2;
s6: the wastewater treated by the disinfection tank can be discharged after being detected to be qualified.
2. The process for removing total nitrogen from printing and dyeing wastewater according to claim 1, wherein: a pretreatment tank is arranged between the regulating tank in the step S2 and the anaerobic tank in the step S3, a pretreatment agent is added into the pretreatment tank, and the pretreatment agent comprises the following components in parts by weight:
10-60 parts of 2-phosphonic butane-1, 2, 4-tricarboxylic acid;
15-80 parts of an alkaline assistant;
160-240 parts of water.
3. The process for removing total nitrogen from printing and dyeing wastewater according to claim 1, wherein: the composite strains added in the aerobic tank in the step S4 comprise the following components in percentage by weight:
4. the process for removing the total nitrogen in the printing and dyeing wastewater as claimed in claim 2, wherein: when the wastewater is refluxed in the step S4, adding an organic carbon source supplement into the refluxed wastewater, wherein the organic carbon source supplement comprises the following components in percentage by weight:
30-50% of glucose;
20-30% of methanol;
20-40% of water.
5. The process for removing total nitrogen from printing and dyeing wastewater according to claim 1, wherein: an oxygen slow release agent is also added into the organic carbon source supplementing machine, and comprises the following components in percentage by weight:
6. the process for removing total nitrogen from printing and dyeing wastewater according to claim 1, wherein: the oxygen slow release agent is also added with charcoal powder loaded with iron ions, and comprises the following components in percentage by weight:
7. the process for removing total nitrogen from printing and dyeing wastewater according to claim 1, wherein: KH is also added into the oxygen slow-release agent2PO4The oxygen slow release agent comprises the following components in percentage by weight:
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112079527A (en) * | 2020-09-07 | 2020-12-15 | 杭州电子科技大学 | Efficient biochemical treatment method for printing and dyeing wastewater |
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| CN104556572A (en) * | 2014-12-26 | 2015-04-29 | 江苏艾特克环境工程设计研究院有限公司 | Efficient biochemical nitrogen and phosphorus removal method for waste water |
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| CN106186320A (en) * | 2016-08-12 | 2016-12-07 | 河海大学 | A kind of denitrification process of dyeing waste water |
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