CN112028390B - Method for treating dimethylamine wastewater - Google Patents
Method for treating dimethylamine wastewater Download PDFInfo
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- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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Abstract
The invention provides a method for treating dimethylamine wastewater, which comprises pH regulation, pretreatment, ammoniation treatment, nitration treatment and denitrification treatment. The dimethylamine wastewater is treated by the method, the T-N removal rate reaches 99.2 percent, and the dimethylamine removal rate reaches 99.7 percent; the water treatment efficiency is high, the treatment period is short, and the method can adapt to continuous industrial production with large wastewater quantity; all water quality indexes can meet the water treatment discharge standard, and can meet the recycling requirement in production, thereby effectively reducing the waste of water resources; the system environment is stable in the sewage treatment process, and the water treatment effect is good.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a method for treating dimethylamine wastewater.
Background
With the increasing expansion of urban population and the continuous development of industry and agriculture, water environment pollution accidents occur frequently, and the health and the life of people and livestock are seriously injured. Many lakes and reservoirs cause eutrophication of water bodies due to the discharge of nitrogen and phosphorus, and seriously threaten the production life and ecological balance of human beings. Ammonia nitrogen is one of the main factors causing water eutrophication. In order to meet the increasing requirements of the public on the environmental quality, the nation sets up more and more strict emission standards for nitrogen, and research and development of economic and efficient nitrogen removal treatment technology becomes the focus and hot spot of research in the field of water pollution control engineering.
Dimethylamine (DMA), also known as N-methyl methylamine or aminodimethane, is readily soluble in water, is an important chemical intermediate, and is widely used as a raw material for rubber vulcanization accelerators, pharmaceuticals (such as antibiotics), dyes, pesticides (such as thiram, chlordimeform, and the like), industrial solvents (such as N, N-dimethylformamide), and propellants. Dimethylamine is easy to volatilize, has strong stimulation effect on eyes and respiratory tracts, can generate unpleasant fishy smell when the wastewater contains dimethylamine with lower concentration, and can cause great influence on human bodies, organisms and environment if the wastewater is directly discharged into water bodies.
At present, the method for treating dimethylamine wastewater at home and abroad mainly comprises a physical method and a chemical methodMethods, biological methods, as well as physicochemical methods, physical biological methods, and the like. Common physical methods include adsorption, extraction, ion exchange, and air stripping. Common chemical methods are a Fenton oxidation method, a supercritical oxidation method, an electrochemical degradation method, a photocatalytic oxidation method and the like. Wherein the biological method is a method for degrading organic matters by using biochemical action of microorganisms. After biochemical treatment, dimethylamine is hydrolyzed to generate amine substances, and finally the amine substances are converted into ammonia Nitrogen (NH) 3 -N), total Nitrogen (TN).
Chinese patent CN111333257a discloses a biological denitrification treatment method for dimethylamine wastewater, which comprises adjusting PH, performing ammoniation treatment by using enrichment-cultured special ammoniating bacteria, and then performing nitrification and denitrification treatment to treat dimethylamine wastewater. The disadvantages of the patent are that: although the polyethylene/polyurethane filler for promoting the growth of strains is added in the nitrification and denitrification treatment processes, the treatment efficiency is not ideal when dimethylamine wastewater is treated, the ammoniation treatment, the nitrification treatment and the denitrification treatment need to be repeatedly circulated for many times to treat the wastewater to the expected index range, the treatment period is long, and the method cannot adapt to continuous industrial production with large wastewater quantity. In addition, after the dimethylamine wastewater is treated by adopting the treatment method, the other water treatment indexes are still not ideal except that the indexes of total nitrogen and ammonia nitrogen reach the standard.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for treating dimethylamine wastewater, which has high water treatment efficiency and short treatment period and can adapt to continuous industrial production with large wastewater quantity; in addition, after dimethylamine wastewater is treated, all water treatment indexes are excellent, and the wastewater can be discharged after reaching standards.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for treating dimethylamine wastewater comprises pH regulation, pretreatment, ammoniation treatment, nitration treatment and denitrification treatment.
And (3) adjusting the pH, namely adding sulfuric acid into the wastewater containing dimethylamine until the pH value of the wastewater is 6.5-7.5.
The concentration of the sulfuric acid is 69%.
And in the pretreatment, adding activated carbon particles into the wastewater after the PH adjustment, and stirring at the rotation speed of 10-15RPM for 2-3h under the environment of 35-45 ℃.
The wastewater: the weight ratio of the activated carbon particles is (1500-1800) 1.
The activated carbon particles are activated carbon particles loaded with bacillus mucilaginosus and pseudomonas stutzeri. The preparation method of the activated carbon particles comprises activated carbon particle treatment and loading.
Treating the activated carbon particles, namely putting the activated carbon particles of 5 to 10 meshes into the activated carbon particles dispersed with yeast glucan and CaCl 2 Heating the mixture to 60 to 70 ℃, stirring at the rotating speed of 30 to 40RPM, and stirring for 15 to 20min; then filtering out activated carbon particles, and carrying out microwave treatment on the activated carbon particles, wherein the microwave radiation power is 300W, the microwave frequency is 2200MHz, and the microwave treatment is 5-8min; and drying the activated carbon particles subjected to the microwave treatment by adopting hot air at 70 to 80 ℃ until the moisture content of the activated carbon is less than 10ppm.
And (2) loading the bacillus subtilis, the bacillus mucilaginosus, the pseudomonas stutzeri and the activated carbon particles into an aseptic activated culture medium, adding a culture solution, and carrying out shake cultivation for 20 to 28h at the temperature of 35 ℃ and at the speed of 100 to 120RPM to prepare the activated carbon particles loaded with the bacillus subtilis, the bacillus mucilaginosus and the pseudomonas stutzeri.
The activated carbon particles are: dispersed with yeast dextran and CaCl 2 The volume ratio of the aqueous solution of (1) is (2~3).
The activated carbon comprises the following components: yeast glucan: caCl 2 The weight ratio of (1), (0.13) - (0.2): (0.06 to 0.11).
The bacillus mucilaginosus: the weight ratio of the pseudomonas stutzeri is 1: (2~3).
The culture solution is water solution of glucose, tryptone, yeast extract and NaCl. The glucose: tryptone: yeast extract (B): naCl: the weight ratio of deionized water is (2) - (4).
And (3) performing ammoniation treatment, namely mixing the pretreated wastewater with composite ammoniation bacteria, stirring at the rotating speed of 20-30RPM for 5-6 h, and performing ammoniation treatment.
The composite microbial agent is prepared by mixing ammonifying bacteria, bacillus mycoides and bacillus subtilis which are subjected to enrichment culture in activated sludge.
The ammonifying bacteria: b, bacillus mycoides: the weight ratio of the bacillus subtilis is 2 to 4.
The enrichment culture adopts glucose, potassium dihydrogen phosphate and KH 2 PO 4 And taking the water solution of the malt wort and the gelatin peptone as an ammonifying bacteria enrichment culture solution, adjusting the concentration of dimethylamine in the culture solution to be 200mg/L, the enrichment culture temperature to be 25-35 ℃, and the enrichment culture time to be 96-144h.
The glucose, naCl and KH 2 PO 4 And the ratio of the weight parts of the wort, the gelatin peptone and the deionized water is (6~8): (1~3) 1~2 (5~7): (2~3): 300.
the activated sludge is taken from a dimethylamine wastewater treatment pool.
And (3) performing nitration treatment, adjusting the pH value of the wastewater after the ammoniation treatment to 8.1-8.5, adjusting the dissolved oxygen amount of the wastewater to 2.5-3 mg/L, and adding a nitration suspension filler to perform nitration treatment on the wastewater.
And (3) putting the activated carbon particles treated by the activated carbon particles in the pretreatment step, nitrosococcus, nitrosospira and nitrobacter winogradskyi into a sterile culture medium carrying a culture solution, and performing shake culture at the temperature of 30 ℃ and at the RPM of 20-40RPM for 16-20h to obtain the nitrified suspended filler.
The weight ratio of the nitrosococcus to the nitrosospira to the nitrobacter winogradskyi is 3.
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight part ratio of the deionized water is 2 to 4.
And (3) performing denitrification treatment, namely adjusting the pH of the wastewater subjected to the nitrification treatment to 7.0-7.5, adjusting the dissolved oxygen of the wastewater to 0.2-0.4 mg/L, adding a denitrification suspension filler, and performing denitrification treatment on the wastewater at a stirring speed of 10-15RPM.
And placing the activated carbon particles treated by the activated carbon particles in the pretreatment step, anaerobic bacillus, denitrifying phosphorus-accumulating bacteria and denitrifying pseudomonas into a sterile culture medium carrying a culture solution, and carrying out shake culture at 25 ℃ and 30 to 40RPM for 25 to 30h in an anaerobic environment to obtain the nitrifying suspended filler.
The weight ratio of the anaerobic bacillus to the denitrifying phosphorus accumulating bacteria to the denitrifying pseudomonas is 1.
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight part ratio of the deionized water is 2 to 4.
Compared with the prior art, the invention has the beneficial effects that:
(1) By adopting the method for treating the dimethylamine wastewater to treat the dimethylamine wastewater, the T-N removal rate reaches 99.2 percent, and the dimethylamine removal rate reaches 99.7 percent;
(2) The dimethylamine wastewater treatment is carried out by adopting the treatment method of dimethylamine wastewater, and the indexes of the water quality after treatment are shown in the following table:
(3) By adopting the method for treating the dimethylamine wastewater to treat the dimethylamine wastewater, the water treatment efficiency is high, the treatment period is short, and the method can be suitable for continuous industrial production with large wastewater quantity;
(4) By adopting the method for treating the dimethylamine wastewater to treat the dimethylamine wastewater, all water quality indexes can meet the water treatment discharge standard and the recycling requirement in production, and the waste of water resources is effectively reduced;
(5) The treatment method of the dimethylamine wastewater provided by the invention is used for treating the dimethylamine wastewater, and the system environment is stable in the sewage treatment process, and the water treatment effect is good.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described.
Example 1
A method for treating dimethylamine wastewater comprises pH regulation, pretreatment, ammoniation treatment, nitration treatment and denitrification treatment.
And (3) adjusting the pH, namely adding sulfuric acid into the wastewater containing dimethylamine until the pH value of the wastewater is 6.5.
The concentration of the sulfuric acid is 69%.
And in the pretreatment, adding activated carbon particles into the wastewater after the pH adjustment, and stirring for 2 hours at the stirring speed of 10RPM in the environment of 35 ℃.
The wastewater: the weight ratio of the activated carbon particles is 1500) to 1.
The activated carbon particles are loaded with bacillus mucilaginosus and pseudomonas stutzeri. The preparation method of the activated carbon particles comprises the steps of activated carbon particle treatment and loading.
Treating the activated carbon particles, namely putting the activated carbon particles of 5 meshes into the activated carbon particles dispersed with yeast glucan and CaCl 2 Heating the mixture to 60 ℃, stirring at the rotating speed of 30RPM for 15min; then filtering out activated carbon particles, and carrying out microwave treatment on the activated carbon particles, wherein the microwave radiation power is 300W, the microwave frequency is 2200MHz, and the microwave treatment time is 5min; and drying the activated carbon particles subjected to the microwave treatment by adopting hot air at 70 ℃ until the moisture content of the activated carbon is less than 10ppm.
And loading, namely placing the bacillus subtilis, the bacillus mucilaginosus, the pseudomonas stutzeri and the activated carbon particles into a sterile active culture medium, adding a culture solution, and performing shake cultivation for 20 hours at the temperature of 35 ℃ and at the RPM of 100 to obtain the activated carbon particles loaded with the bacillus subtilis, the bacillus mucilaginosus and the pseudomonas stutzeri.
The activated carbon particles are: dispersed with yeast dextran and CaCl 2 The volume ratio of the aqueous solution of (a) is 1:2.
The activated carbon comprises the following components: yeast glucan: caCl 2 The weight ratio of (1): 0.06.
the bacillus mucilaginosus: the weight ratio of the pseudomonas stutzeri is 1:2.
the culture solution is aqueous solution of glucose, tryptone, yeast extract and NaCl. The glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is (2).
And in the ammonification treatment, the pretreated wastewater is mixed with the composite ammonification bacteria, the stirring speed is 20RPM, and the stirring time is 5 hours, so that the ammonification treatment is carried out.
The compound microbial inoculum is prepared by mixing ammoniated bacteria, bacillus mycoides and bacillus subtilis which are subjected to enrichment culture in activated sludge.
The ammonifying bacteria: bacillus mycoides: the weight ratio of the bacillus subtilis is 2.
The enrichment culture adopts glucose, potassium dihydrogen phosphate and KH 2 PO 4 And taking the water solution of the malt extract and the gelatin peptone as an ammonifying bacteria enrichment culture solution, adjusting the concentration of dimethylamine in the culture solution to be 200mg/L, the enrichment culture temperature to be 25 ℃, and the enrichment culture time to be 96h.
The glucose, naCl and KH 2 PO 4 And the ratio of the weight parts of the wort, the gelatin peptone and the deionized water is 6:1:1:5:2:300.
the activated sludge is taken from a dimethylamine wastewater treatment pool.
And (3) nitrifying, namely adjusting the pH value of the wastewater subjected to ammoniation treatment to 8.1, adjusting the dissolved oxygen amount of the wastewater to 2.5mg/L, and adding nitrifying suspended filler to nitrify the wastewater.
And (3) putting the activated carbon particles treated by the activated carbon particles in the pretreatment step, nitrosococcus, nitrosospira and nitrobacter winogradskyi into a sterile culture medium carrying a culture solution, and performing shake culture at the temperature of 30 ℃ and at the RPM of 20 for 16 hours to obtain the nitrified suspended filler.
The weight parts of the nitrosococcus, the nitrosospira and the nitrobacter winogradskyi are as follows (3).
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight parts of the deionized water are as follows.
And (3) performing denitrification treatment, namely adjusting the pH value of the nitrified wastewater to 7.0, adjusting the dissolved oxygen content of the wastewater to 0.2mg/L, adding a denitrification suspension filler, and performing denitrification treatment on the wastewater at a stirring speed of 10 RPM.
And placing the activated carbon particles treated by the activated carbon particles in the pretreatment step, anaerobic bacillus, denitrifying phosphorus accumulating bacteria and denitrifying pseudomonas into a sterile culture medium carrying a culture solution, and carrying out shake culture for 25 hours at the temperature of 25 ℃ and at 30RPM under an anaerobic environment to obtain the nitrifying suspension filler.
The weight ratio of the anaerobic bacillus to the denitrifying phosphorus accumulating bacteria to the denitrifying pseudomonas is 1.
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is (2).
Example 2
A method for treating dimethylamine wastewater comprises pH regulation, pretreatment, ammoniation treatment, nitration treatment and denitrification treatment.
And (3) adjusting the pH, namely adding sulfuric acid into the wastewater containing dimethylamine until the pH value of the wastewater is 7.0.
The concentration of the sulfuric acid is 69%.
And in the pretreatment, activated carbon particles are added into the wastewater after the pH adjustment, and the stirring speed is 15RPM and the stirring time is 3h under the environment of 40 ℃.
The wastewater: the weight ratio of the activated carbon particles is 1600.
The activated carbon particles are activated carbon particles loaded with bacillus mucilaginosus and pseudomonas stutzeri. The preparation method of the activated carbon particles comprises activated carbon particle treatment and loading.
Treating the activated carbon particles, namely putting 10-mesh activated carbon particles into the activated carbon particles dispersed with yeast glucan and CaCl 2 Heating the water solution to 60 ℃, and stirring for 20min at the stirring speed of 40 RPM; then filtering out activated carbon particles, and carrying out microwave treatment on the activated carbon particles, wherein the microwave radiation power is 300W, the microwave frequency is 2200MHz, and the microwave treatment time is 6min; and drying the activated carbon particles subjected to the microwave treatment by adopting hot air at 70 ℃ until the moisture content of the activated carbon is less than 10ppm.
And loading, namely placing the bacillus subtilis, the bacillus mucilaginosus, the pseudomonas stutzeri and the activated carbon particles into a sterile active culture medium, adding a culture solution, and performing shake cultivation for 24 hours at the temperature of 35 ℃ and at the RPM of 100 to obtain the activated carbon particles loaded with the bacillus subtilis, the bacillus mucilaginosus and the pseudomonas stutzeri.
The activated carbon particles are: dispersed with yeast dextran and CaCl 2 The volume ratio of the aqueous solution of (1).
The activated carbon comprises the following components: yeast glucan: caCl 2 The weight ratio of (1): 0.09.
the bacillus mucilaginosus: the weight ratio of the pseudomonas stutzeri is 1:3.
the culture solution is aqueous solution of glucose, tryptone, yeast extract and NaCl. The glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is 3.
And in the ammonification treatment, the pretreated wastewater is mixed with the composite ammonification bacteria, the stirring speed is 25RPM, and the stirring time is 6 hours, so that the ammonification treatment is carried out.
The compound microbial inoculum is prepared by mixing ammoniated bacteria, bacillus mycoides and bacillus subtilis which are subjected to enrichment culture in activated sludge.
The ammonifying bacteria: b, bacillus mycoides: the weight ratio of the bacillus subtilis is 3.
The enrichment culture adopts glucose, potassium dihydrogen phosphate and KH 2 PO 4 And taking the water solution of the malt extract and the gelatin peptone as an ammonifying bacteria enrichment culture solution, adjusting the concentration of dimethylamine in the culture solution to be 200mg/L, the enrichment culture temperature to be 30 ℃, and the enrichment culture time to be 120h.
The glucose, naCl and KH 2 PO 4 And the ratio of the weight parts of the wort, the gelatin peptone and the deionized water is 7:2:1:5:2:300.
The activated sludge is taken from a dimethylamine wastewater treatment pool.
And (3) nitrifying, namely adjusting the pH value of the wastewater subjected to ammoniation treatment to 8.5, adjusting the dissolved oxygen amount of the wastewater to 3mg/L, and adding nitrifying suspended filler to nitrify the wastewater.
And (3) putting the activated carbon particles treated by the activated carbon particles in the pretreatment step, nitrosococcus, nitrosospira and nitrobacter winogradskyi into a sterile culture medium carrying a culture solution, and performing shake cultivation for 18h at 30 ℃ and 30RPM to obtain the nitrified suspended filler.
The weight ratio of the nitrosococcus to the nitrosospira to the nitrobacter winogradskyi is 3.
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is 3.
And (3) performing denitrification treatment, namely adjusting the pH of the wastewater subjected to the nitrification treatment to 7.0, adjusting the dissolved oxygen content of the wastewater to 0.3mg/L, adding a denitrification suspended filler, and performing denitrification treatment on the wastewater at a stirring speed of 15 RPM.
And placing the activated carbon particles treated by the activated carbon particles in the pretreatment step, anaerobic bacillus, denitrifying phosphorus accumulating bacteria and denitrifying pseudomonas into a sterile culture medium carrying a culture solution, and performing shake culture at 25 ℃ and 40RPM for 28h in an anaerobic environment to obtain the nitrifying suspension filler.
The weight ratio of the anaerobic bacillus to the denitrifying phosphorus accumulating bacteria to the denitrifying pseudomonas is 1.
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is 4.
Example 3
A method for treating dimethylamine wastewater comprises pH regulation, pretreatment, ammoniation treatment, nitration treatment and denitrification treatment.
And (3) adjusting the pH, namely adding sulfuric acid into the wastewater containing dimethylamine until the pH value of the wastewater is 7.5.
The concentration of the sulfuric acid is 69%.
And in the pretreatment, activated carbon particles are added into the wastewater after the pH adjustment, and the stirring speed is 15RPM under the environment of 45 ℃ for 3 hours.
The wastewater: the weight ratio of the activated carbon particles is 1800.
The activated carbon particles are activated carbon particles loaded with bacillus mucilaginosus and pseudomonas stutzeri. The preparation method of the activated carbon particles comprises activated carbon particle treatment and loading.
Treating the activated carbon particles, namely putting 10-mesh activated carbon particles into the activated carbon particles dispersed with yeast glucan and CaCl 2 Heating the water solution to 70 ℃, and stirring for 20min at the rotating speed of 40 RPM; then filtering out activated carbon particles, and carrying out microwave treatment on the activated carbon particles, wherein the microwave radiation power is 300W, the microwave frequency is 2200MHz, and the microwave treatment time is 8min; and drying the activated carbon particles subjected to the microwave treatment by adopting hot air at the temperature of 80 ℃ until the moisture content of the activated carbon is less than 10ppm.
And loading, namely placing the bacillus subtilis, the bacillus mucilaginosus, the pseudomonas stutzeri and the activated carbon particles into a sterile active culture medium, adding a culture solution, and performing shake cultivation for 28h at the temperature of 35 ℃ and at the RPM of 120 to obtain the activated carbon particles loaded with the bacillus subtilis, the bacillus mucilaginosus and the pseudomonas stutzeri.
The activated carbon particles are as follows: dispersed with yeast dextran and CaCl 2 The volume ratio of the aqueous solution of (a) is 1:3.
The activated carbon is as follows: yeast glucan: caCl 2 The weight ratio of (1).
The bacillus mucilaginosus: the weight ratio of the pseudomonas stutzeri is 1:3.
the culture solution is aqueous solution of glucose, tryptone, yeast extract and NaCl. The glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is 4.
And in the ammonification treatment, the pretreated wastewater is mixed with the composite ammonification bacteria, the stirring speed is 30RPM, and the stirring time is 6 hours, so that the ammonification treatment is carried out.
The composite microbial agent is prepared by mixing ammonifying bacteria, bacillus mycoides and bacillus subtilis which are subjected to enrichment culture in activated sludge.
The ammonifying bacteria: b, bacillus mycoides: the weight ratio of the bacillus subtilis is 4.
The enrichment culture adopts glucose, potassium dihydrogen phosphate and KH 2 PO 4 And taking the aqueous solution of the malt extract and the gelatin peptone as an ammoniation bacterium enrichment culture solution, adjusting the concentration of dimethylamine in the culture solution to be 200mg/L, the enrichment culture temperature to be 35 ℃, and the enrichment culture time to be 144h.
The glucose, naCl and KH 2 PO 4 And the ratio of the weight parts of the wort, the gelatin peptone and the deionized water is 8.
The activated sludge is taken from a dimethylamine wastewater treatment pool.
And (3) nitrifying, namely adjusting the pH value of the wastewater subjected to ammoniation treatment to 8.5, adjusting the dissolved oxygen amount of the wastewater to 3mg/L, and adding nitrifying suspended filler to nitrify the wastewater.
And (3) putting the activated carbon particles treated by the activated carbon particles in the pretreatment step, nitrosococcus, nitrosospira and nitrobacter winogradskyi into a sterile culture medium carrying a culture solution, and performing shake culture at 40RPM for 20 hours at the temperature of 30 ℃ to obtain the nitrified suspended filler.
The weight ratio of the nitrosococcus to the nitrosospira to the nitrobacter winogradskyi is 3.
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is 4.
And (3) performing denitrification treatment, namely adjusting the pH of the wastewater subjected to the nitrification treatment to 7.5, adjusting the dissolved oxygen content of the wastewater to 0.4mg/L, adding a denitrification suspended filler, and performing denitrification treatment on the wastewater at a stirring speed of 15 RPM.
And placing the activated carbon particles treated by the activated carbon particles in the pretreatment step, anaerobic bacillus, denitrifying phosphorus accumulating bacteria and denitrifying pseudomonas into a sterile culture medium carrying a culture solution, and carrying out shake culture for 30 hours at 25 ℃ and 40RPM in an anaerobic environment to obtain the nitrifying suspension filler.
The weight ratio of the anaerobic bacillus to the denitrifying phosphorus accumulating bacteria to the denitrifying pseudomonas is 1.
The culture solution is an aqueous solution of glucose, tryptone, yeast extract and NaCl, wherein the ratio of glucose: tryptone: yeast extract (B): naCl: the weight ratio of the deionized water is 4.
Example 4
The method for treating dimethylamine wastewater described in examples 1 to 3 was adopted, comparative examples 1 to 3 were set, and the water quality indexes after water treatment by the methods for treating dimethylamine wastewater described in examples 1 to 3 and comparative examples 1 to 3 were compared.
The water quality indexes of the selected wastewater test sample containing dimethylamine are shown in the following table:
comparative example 1: the dimethylamine wastewater treatment method of example 2 is adopted, and the differences are that: the "pre-treatment step" is omitted.
Comparative example 2: the dimethylamine wastewater treatment method of example 2 is adopted, and the differences are that: the ammonifying bacteria adopted in the ammonifying treatment step are only ammonifying bacteria which are enriched and cultured in the activated sludge.
Comparative example 3: the dimethylamine wastewater treatment method of example 2 is adopted, and the differences are that: (1) The nitrification treatment step does not adopt nitrification suspended filler, and only adopts a conventional nitrification treatment method on the premise of consistent nitrifying bacteria. (2) In the denitrification treatment step, the denitrification suspended filler is not adopted, and only a conventional denitrification treatment method is adopted on the premise of consistency of denitrifying bacteria.
The comparison of the detection indexes of the dimethylamine wastewater treated in the examples 1 to 3 and the comparative examples 1 to 3 is shown in the following table:
all percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The method for treating the dimethylamine wastewater is characterized by comprising pH regulation, pretreatment, ammoniation treatment, nitration treatment and denitrification treatment;
the pretreatment is carried out, wherein activated carbon particles are added into dimethylamine wastewater with the pH value of 6.5 to 7.5 after the pH value is adjusted;
the activated carbon particles are activated carbon particles loaded with bacillus mucilaginosus and pseudomonas stutzeri;
the preparation method of the active carbon particles comprises the steps of treating and loading the active carbon particles;
treating the activated carbon particles, namely putting the activated carbon particles into the yeast glucan and CaCl dispersed in the activated carbon particles 2 Heating the mixture to 60 to 70 ℃, and stirring for a certain time; then filtering out activated carbon particles, and carrying out microwave treatment on the activated carbon particles for 5 to 8min; drying the activated carbon particles subjected to microwave treatment by adopting hot air at 70-80 ℃ until the moisture content of the activated carbon is less than 10ppm;
in the microwave treatment process, the microwave frequency is 2200MHz;
the loading comprises the steps of putting the bacillus subtilis, the bacillus mucilaginosus, the pseudomonas stutzeri and the activated carbon particles after the activated carbon particles are treated into a sterile activated culture medium, adding a culture solution, and performing shake cultivation for a certain time to obtain the activated carbon particles loaded with the bacillus subtilis, the bacillus mucilaginosus and the pseudomonas stutzeri;
the nitrification treatment is carried out, the pH value of the wastewater after the ammoniation treatment is adjusted to 8.1-8.5, the dissolved oxygen amount of the wastewater is adjusted to 2.5-3 mg/L, and a nitrification suspended filler is added to carry out nitrification treatment on the wastewater;
the nitrified suspended filler is prepared by putting the activated carbon particles treated by the activated carbon particles in the pretreatment step, nitrosococcus, nitrosospira and nitrobacter winogradskyi into a sterile culture medium carrying a culture solution for culture;
the denitrification treatment is carried out, the pH value of the wastewater after the nitrification treatment is adjusted to 7.0-7.5, the dissolved oxygen of the wastewater is adjusted to 0.2-0.4 mg/L, a denitrification suspended filler is added, and the wastewater is stirred and subjected to denitrification treatment;
the denitrifying filler is prepared by placing the activated carbon particles treated by the activated carbon particles in the pretreatment step, anaerobic bacillus, denitrifying phosphorus accumulating bacteria and denitrifying pseudomonas into a sterile culture medium carrying a culture solution and carrying out anaerobic culture.
2. The method for treating dimethylamine wastewater according to claim 1, wherein in the ammonification treatment, the pretreated wastewater is mixed with composite ammonifying bacteria, stirred and ammonified; the compound ammonifying bacteria are prepared by mixing ammonifying bacteria cultured by activated sludge enrichment with bacillus mycoides and bacillus subtilis.
3. The method for treating dimethylamine wastewater according to claim 2, wherein the ammonifying bacteria: b, bacillus mycoides: the weight ratio of the bacillus subtilis is 2 to 4.
4. The method for treating dimethylamine waste water of claim 2, wherein the enrichment culture uses glucose, potassium dihydrogen phosphate, KH 2 PO 4 And taking an aqueous solution of the wort and the gelatin peptone as an enrichment culture solution of the ammoniation bacteria, adjusting the concentration of dimethylamine in the culture solution to be 200mg/L, and adjusting the enrichment culture temperature to be 25-35 ℃ and the enrichment culture time to be 96-144h.
5. The method for treating dimethylamine waste water of claim 1, wherein the culture solution is an aqueous solution of glucose, tryptone, yeast extract, and NaCl, and the ratio of glucose: tryptone: yeast extract (B): naCl: the weight part ratio of the deionized water is 2 to 4.
6. The method for treating dimethylamine wastewater according to claim 1, wherein the ratio of the anaerobic bacillus, the denitrifying phosphorus-accumulating bacteria and the denitrifying pseudomonas is 1.
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