CN111470707A - Biological treatment synergistic method for refractory organic wastewater - Google Patents
Biological treatment synergistic method for refractory organic wastewater Download PDFInfo
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- CN111470707A CN111470707A CN202010221112.5A CN202010221112A CN111470707A CN 111470707 A CN111470707 A CN 111470707A CN 202010221112 A CN202010221112 A CN 202010221112A CN 111470707 A CN111470707 A CN 111470707A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/30—Organic 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
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention discloses a biodegradation synergistic method for organic wastewater difficult to degrade, which comprises the following steps of S1: strengthening the pretreatment of wastewater; s2: adding special biological bacteria; s3: adding biological spherical filler; after the improvement, the Fenton treatment process is added, the special synergistic bacteria and the biological filler are added, most of toxic substances such as long-chain organic matters, phenol and the like can be effectively broken and decomposed, the biodegradability of the wastewater is improved, the mass propagation of biological bacteria is facilitated, the effluent of a biochemical treatment system is obviously improved and kept stable in operation, and the effluent index is lower than the discharge standard.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a biological treatment synergistic method for refractory organic wastewater.
Background
With more and more people paying attention to the environmental protection problem and the national improvement of the environmental protection discharge standard, stricter requirements are made on the discharge of sewage generated by a plurality of existing chemical plants, the components of the waste water produced by the traditional chemical plants are complex, and the water contains organic matters such as alkylphenol, polyaldehyde, methanol, toluene and the like; the organic wastewater not only has high organic matter concentration, but also is difficult to degrade, has toxicity and is easy to be unfavorable for subsequent biological treatment; although the original treatment process can treat the water to reach the standard and discharge the water, the effluent after biochemical treatment has poor stability and often exceeds the standard; therefore, the originally discharged water has to be returned to a water treatment system for retreatment, which causes the water treatment efficiency of a factory to be reduced, and further has important influence on production, and therefore, the development of a process capable of improving the stability of a biochemical water treatment system is very important.
Disclosure of Invention
The invention aims to provide a method for improving the efficiency of the biological treatment of refractory organic wastewater, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for increasing the efficiency of the biological treatment of refractory organic wastewater comprises the following three steps added in the original wastewater treatment process:
s1: the process for strengthening the pretreatment of the wastewater comprises the following specific steps:
a. adding a first-level Fenton reagent treatment process to carry out oxidative degradation treatment on macromolecular organic matters in the wastewater;
b. starting a circulating pump and aeration, controlling the circulating flow of the pump to be 2.4 cubic meters per hour, fully contacting iron carbon with water in a circulating mode of downward inlet and upward outlet, wherein the aeration time of each batch is 8 hours, and the ratio of aeration to water is 1: 15;
c. after 8 hours of reaction, pumping water into a Fenton reagent reaction tank, and controlling the weight ratio of ferrous ions to hydrogen peroxide in the water to be 1: 1;
d. maintaining the reaction time to be 4-6 hours, and leading the added medicament to have water to react completely;
e. pumping the water after the reaction into a neutralization tank, entering the stages of neutralization, coagulation and sedimentation separation, separating mud and water in a sedimentation tank, carrying out filter pressing treatment on the mud, introducing the water into an adjusting tank for homogeneous adjustment, adopting domestic wastewater, laboratory water and wastewater spray washing water for adjustment, and controlling the CODCr of the inlet water to be between 3000 and 4000mg/l and the total salt content to be 1.1 percent after adjustment;
f. after the homogenization adjustment is finished and the homogenization is detected to be within the control index range, the mixture can enter a biochemical system for treatment;
s2: adding special biological bacteria, wherein the specific adding steps comprise:
g. respectively adding OBT lytic bacteria and BIOFORM ME bacteria into a 1-cubic trough body with an aeration device, and then adding aerobic sections into the aerobic sections to discharge water, wherein the proportion of the aerobic sections is 1 kilogram of bacteria and 40 liters of water, and the total amount of the aerobic sections is 15 kilograms of bacteria and 600 kilograms of water; adding brown sugar, monopotassium phosphate and urea into the tank after water is added, adding the brown sugar, monopotassium phosphate and urea according to the proportion of C to N to P =100 to 5 to 1, starting aeration, controlling DO =2-4mg/l, aerating for 24 hours, culturing bacteria, and using the bacteria for later use after the bacteria are added;
h. stopping the biochemical system from feeding water and discharging water for 3 days, closing aeration in the aerobic tank, standing to discharge partial biochemical mud, controlling the mud amount to be 1/4 of the total amount, starting aeration, respectively pumping the broad and numerous bacteria into a biochemical hydrolysis acidification tank (75 cubic) and the aerobic tank (75 cubic), and adding 100mg/m of the tank volume3Counting; then carrying out extensive propagation exposure for 3 days, maintaining the dissolved oxygen at 2-4mg/l, detecting the nutrition ratio, and adding in time when the deficiency exists;
i. 1/3 of normal water volume begins to enter on the 4 th day, and then the water volume gradually increases to the 6 th day and begins to enter and exit with the normal design water volume;
j. regularly detecting the changes of COD, PH and nutrition ratio in the biochemical stage every day, keeping a certain sludge discharge amount, controlling MISS to be 3500mg/l, and observing the change of SV30 by using a graduated cylinder;
k. after the 8 th day, the biochemical system is recovered to be normal, the ORP of the hydrolysis acidification tank is changed from 70mv to-320 mv, the COD of the effluent is greatly reduced, and the PH of the effluent is 7.5; the original yellow thick foam of the aerobic pool is changed into white foam, and the mud-water interface can be seen clearly; meanwhile, the zoogloea is observed by a microscope, and a large amount of protozoa and coccid are contained in the zoogloea, which indicates that the biochemical system is repaired;
s3: adding biological spherical filler, wherein the process comprises the following specific steps:
l, adding biochemical biological spherical filler with the diameter phi of 150mm, and internally arranging soft filler;
m, the adding proportion is 35 percent of the total tank volume;
and n, observing the change of microorganisms on the sphere.
Preferably, the specific implementation step of adding the primary fenton reagent treatment process in step S1 is to adopt an intermittent treatment mode, and pump the deoiled raw water into an iron-carbon micro-electrolysis cell to control the raw water to be 3-4.
Preferably, the added primary Fenton reagent treatment process is positioned between the iron-carbon micro-electrolysis system and the neutralization and coagulation reaction.
Preferably, biological spherical fillers are respectively added into the hydrolysis acidification tank and the contact anaerobic tank.
Compared with the prior art, the invention has the beneficial effects that:
after the improvement, the Fenton treatment process is added, the special synergistic bacteria and the biological filler are added, most of toxic substances such as long-chain organic matters, phenol and the like can be effectively broken and decomposed, the biodegradability of the wastewater is improved, the mass propagation of biological bacteria is facilitated, the effluent of a biochemical treatment system is obviously improved and kept stable in operation, and the effluent index is lower than the discharge standard.
Drawings
FIG. 1 is a flow chart of an original wastewater treatment process;
FIG. 2 is a flow chart of a new wastewater treatment process proposed by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a method for increasing the efficiency of the biological treatment of refractory organic wastewater comprises the following three steps added in the original wastewater treatment process:
s1: the process for strengthening the pretreatment of the wastewater comprises the following specific steps:
a. adding a first-level Fenton reagent treatment process to carry out oxidative degradation treatment on macromolecular organic matters in the wastewater; the specific implementation step of adding a primary Fenton reagent treatment process in the step S1 is to adopt an intermittent treatment mode, pump the deoiled raw water into an iron-carbon micro-electrolysis cell and control the raw water to be 3-4; thus being beneficial to the micro-electrolysis reaction and the protection of the filler, avoiding excessive consumption of the filler, and the added primary Fenton reagent treatment process is positioned between the iron-carbon micro-electrolysis system and the neutralization and coagulation reaction;
b. starting a circulating pump and aeration, controlling the circulating flow of the pump to be 2.4 cubic meters per hour, fully contacting iron carbon with water in a circulating mode of downward inlet and upward outlet, wherein the aeration time of each batch is 8 hours, and the ratio of aeration to water is 1: 15;
c. after 8 hours of reaction, pumping water into a Fenton reagent reaction tank, and controlling the weight ratio of ferrous ions to hydrogen peroxide in the water to be 1: 1;
d. maintaining the reaction time to be 4-6 hours, and leading the added medicament to have water to react completely;
e. pumping the water after the reaction into a neutralization tank, entering the stages of neutralization, coagulation and sedimentation separation, separating mud and water in a sedimentation tank, carrying out filter pressing treatment on the mud, introducing the water into an adjusting tank for homogeneous adjustment, adopting domestic wastewater, laboratory water and wastewater spray washing water for adjustment, and controlling the CODCr of the inlet water to be between 3000 and 4000mg/l and the total salt content to be 1.1 percent after adjustment;
f. after the homogenization adjustment is finished and the homogenization is detected to be within the control index range, the mixture can enter a biochemical system for treatment;
s2: adding special biological bacteria, wherein the specific adding steps comprise:
g. respectively adding OBT lytic bacteria and BIOFORM ME bacteria into a 1-cubic trough body with an aeration device, and then adding aerobic sections into the aerobic sections to discharge water, wherein the proportion of the aerobic sections is 1 kilogram of bacteria and 40 liters of water, and the total amount of the aerobic sections is 15 kilograms of bacteria and 600 kilograms of water; adding brown sugar, monopotassium phosphate and urea into the tank after water is added, adding the brown sugar, monopotassium phosphate and urea according to the proportion of C to N to P =100 to 5 to 1, starting aeration, controlling DO =2-4mg/l, aerating for 24 hours, culturing bacteria, and using the bacteria for later use after the bacteria are added;
h. stopping the biochemical system from feeding water and discharging water for 3 days, closing aeration in the aerobic tank, standing to discharge partial biochemical mud, controlling the mud amount to be 1/4 of the total amount, starting aeration, respectively pumping the broad and numerous bacteria into a biochemical hydrolysis acidification tank (75 cubic) and the aerobic tank (75 cubic), and adding 100mg/m of the tank volume3Counting; then carrying out extensive propagation exposure for 3 days, maintaining the dissolved oxygen at 2-4mg/l, detecting the nutrition ratio, and adding in time when the deficiency exists;
i. 1/3 of normal water volume begins to enter on the 4 th day, and then the water volume gradually increases to the 6 th day and begins to enter and exit with the normal design water volume;
j. regularly detecting the changes of COD, PH and nutrition ratio in the biochemical stage every day, keeping a certain sludge discharge amount, controlling MISS to be 3500mg/l, and observing the change of SV30 by using a graduated cylinder;
k. after the 8 th day, the biochemical system is recovered to be normal, the ORP of the hydrolysis acidification tank is changed from 70mv to-320 mv, the COD of the effluent is greatly reduced, and the PH of the effluent is 7.5; the original yellow thick foam of the aerobic pool is changed into white foam, and the mud-water interface can be seen clearly; meanwhile, the zoogloea is observed by a microscope, and a large amount of protozoa and coccid are contained in the zoogloea, which indicates that the biochemical system is repaired;
adding OBT lytic bacteria and BIOFORM ME bacteria into a biochemical system; the bacteria can rapidly repair and rejuvenate protozoon bacteria and enrich microorganism types in a biochemical system. The OBT cracking bacteria can efficiently absorb and degrade aromatic compounds such as benzene, phenol and the like, have strong open-loop degradation capability on industrial chemical substances which are not easy to degrade, and have strong capability of resisting impact load and toxic substances. BIOFORM ME bacteria are high-efficiency microbial strains suitable for oil refining and petrochemical pollutants with high salinity. The two are matched for use, so that petroleum compounds, phenol, polycyclic aromatic hydrocarbon, sulfide, ethanol and similar organic matters can be effectively removed, and the salt can be tolerated;
s3: adding biological spherical filler, wherein the process comprises the following specific steps:
l, adding biochemical biological spherical filler with the diameter phi of 150mm, and internally arranging soft filler;
m, the adding proportion is 35 percent of the total tank volume;
and n, observing the change of microorganisms on the sphere, wherein a large number of protozoa exist on the aerobic pool after the aerobic pool is successfully biofilm-coated and microscopic examination about 13 days, and anaerobic hydrolysis acidification begins to biofilm-coated about 20 days, and more micro bubbles are generated on the liquid surface, which indicates that the whole biofilm-coating is successful, and the successful biofilm-coating can reduce the entrainment of sludge discharge to beneficial microorganisms, increase the total amount of the beneficial microorganisms, increase the contact surface area of wastewater pollutants and the microorganisms, and is beneficial to improving the treatment capacity of a biochemical system.
In order to enable microorganisms to grow rapidly and discharge beneficial flora when sludge discharge is reduced, a good carrier needs to be provided for biological bacteria, biological spherical fillers are respectively added into a hydrolysis acidification tank and a contact anaerobic tank, the fillers are beneficial to mass propagation of the microorganisms, the original microorganism growth environment is improved, the number of beneficial microorganisms is increased, and the fillers have longer service life than the traditional combined fillers.
After the treatment, the effluent indexes of CODcr in each process stage can be obtained as follows:
as can be seen from the above table, the difference of the treatment effect of the same type of production wastewater on the concentration of organic matters before and after the technical improvement is obvious; the pretreatment efficiency of the waste water of the prior art is poor, long-chain organic components, phenol and other substances in the waste water are difficult to effectively degrade, and toxic substances are easily introduced into a biochemical system to cause microbial poisoning, so that the treatment efficiency of microorganisms on organic substances is influenced; after the improvement, the Fenton treatment process is added, special synergistic bacteria and biological fillers are added, most of toxic substances such as long-chain organic matters, phenol and the like can be effectively broken and decomposed, the biodegradability of wastewater is improved, the mass propagation of biological bacteria is facilitated, the effluent of a biochemical treatment system is obviously improved and stably kept, and the effluent index is lower than the discharge standard.
In the actual production, the expenditure costs of the processes before and after calculation are as follows:
1. cost of original process
Although the original process has no actual equipment expenditure, 7.6 million of the medicament cost is spent for repairing the biochemical system and maintaining the normal operation of the biochemical system every year, and the total treatment amount of water is reduced because the biochemical system is required to be repaired, so that the water cannot be treated normally, the production is influenced, and the loss is larger.
2. Cost of the invention process
Based on the improvement of the original process facility, the method mainly comprises the steps of investing 16800 yuan (1 time), 3024 yuan/month of hydrogen peroxide, 270 yuan/month of ferrous sulfate and 160 yuan of brown sugar and potassium dihydrogen phosphate in a Fenton reaction tank as a waste reaction kettle device, and investing 20254 yuan of one-time cost; the system operation can keep stable after putting into service.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A method for improving the efficiency of the biological treatment of refractory organic wastewater comprises the following three steps of the original wastewater treatment process and the addition of the three steps in the original wastewater treatment process, and is characterized in that the three steps added in the method are as follows:
s1: the process for strengthening the pretreatment of the wastewater comprises the following specific steps:
a. adding a first-level Fenton reagent treatment process to carry out oxidative degradation treatment on macromolecular organic matters in the wastewater;
b. starting a circulating pump and aeration, controlling the circulating flow of the pump to be 2.4 cubic meters per hour, fully contacting iron carbon with water in a circulating mode of downward inlet and upward outlet, wherein the aeration time of each batch is 8 hours, and the ratio of aeration to water is 1: 15;
c. after 8 hours of reaction, pumping water into a Fenton reagent reaction tank, and controlling the weight ratio of ferrous ions to hydrogen peroxide in the water to be 1: 1;
d. maintaining the reaction time to be 4-6 hours, and leading the added medicament to have water to react completely;
e. pumping the water after the reaction into a neutralization tank, entering the stages of neutralization, coagulation and sedimentation separation, separating mud and water in a sedimentation tank, carrying out filter pressing treatment on the mud, introducing the water into an adjusting tank for homogeneous adjustment, adopting domestic wastewater, laboratory water and wastewater spray washing water for adjustment, and controlling the CODCr of the inlet water to be between 3000 and 4000mg/l and the total salt content to be 1.1 percent after adjustment;
f. after the homogenization adjustment is finished and the homogenization is detected to be within the control index range, the mixture can enter a biochemical system for treatment;
s2: adding special biological bacteria, wherein the specific adding steps comprise:
g. respectively adding OBT lytic bacteria and BIOFORM ME bacteria into a 1-cubic trough body with an aeration device, and then adding aerobic sections into the aerobic sections to discharge water, wherein the proportion of the aerobic sections is 1 kilogram of bacteria and 40 liters of water, and the total amount of the aerobic sections is 15 kilograms of bacteria and 600 kilograms of water; adding brown sugar, monopotassium phosphate and urea into the tank after water is added, adding the brown sugar, monopotassium phosphate and urea according to the proportion of C to N to P =100 to 5 to 1, starting aeration, controlling DO =2-4mg/l, aerating for 24 hours, culturing bacteria, and using the bacteria for later use after the bacteria are added;
h. stopping the biochemical system from feeding water and discharging water for 3 days, closing aeration in the aerobic tank, standing to discharge partial biochemical mud, controlling the mud amount to be 1/4 of the total amount, starting aeration, respectively pumping the broad and numerous bacteria into a biochemical hydrolysis acidification tank (75 cubic) and the aerobic tank (75 cubic), and adding 100mg/m of the tank volume3Counting; then carrying out extensive reproduction exposure for 3 days, maintaining dissolved oxygen 2-4mg/l, detecting nutrition ratio, and adding in time when deficiency occursAdding;
i. 1/3 of normal water volume begins to enter on the 4 th day, and then the water volume gradually increases to the 6 th day and begins to enter and exit with the normal design water volume;
j. regularly detecting the changes of COD, PH and nutrition ratio in the biochemical stage every day, keeping a certain sludge discharge amount, controlling MISS to be 3500mg/l, and observing the change of SV30 by using a graduated cylinder;
k. after the 8 th day, the biochemical system is recovered to be normal, the ORP of the hydrolysis acidification tank is changed from 70mv to-320 mv, the COD of the effluent is greatly reduced, and the PH of the effluent is 7.5; the original yellow thick foam of the aerobic pool is changed into white foam, and the mud-water interface can be seen clearly; meanwhile, the zoogloea is observed by a microscope, and a large amount of protozoa and coccid are contained in the zoogloea, which indicates that the biochemical system is repaired;
s3: adding biological spherical filler, wherein the process comprises the following specific steps:
l, adding biochemical biological spherical filler with the diameter phi of 150mm, and internally arranging soft filler;
m, the adding proportion is 35 percent of the total tank volume;
and n, observing the change of microorganisms on the sphere.
2. The method for enhancing the biological treatment efficiency of the refractory organic wastewater as recited in claim 1, wherein: the specific implementation step of adding the primary Fenton reagent treatment process in the step S1 is to adopt an intermittent treatment mode, pump the deoiled raw water into an iron-carbon micro-electrolysis cell and control the raw water to be 3-4.
3. The method for enhancing the biological treatment efficiency of the refractory organic wastewater as recited in claim 1, wherein: the added primary Fenton reagent treatment process is positioned between the iron-carbon micro-electrolysis system and the neutralization and coagulation reaction.
4. The method for enhancing the biological treatment efficiency of the refractory organic wastewater as recited in claim 1, wherein: biological spherical fillers are respectively added into the hydrolysis acidification tank and the contact anaerobic tank.
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| CN113292157A (en) * | 2021-02-08 | 2021-08-24 | 深圳前海百润环保科技有限公司 | Fixed bed biological membrane sewage treatment method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113292157A (en) * | 2021-02-08 | 2021-08-24 | 深圳前海百润环保科技有限公司 | Fixed bed biological membrane sewage treatment method and system |
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