CN114853255A - Grading advanced treatment process for fluctuation variable water quality industrial wastewater - Google Patents
Grading advanced treatment process for fluctuation variable water quality industrial wastewater Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a grading advanced treatment process for water quality industrial wastewater with variable fluctuation, which is characterized in that the industrial wastewater is graded according to COD value, wherein the COD value is more than 50mg/L and less than or equal to 60mg/L, the concentration is low, the COD value is more than 60mg/L and less than or equal to 80mg/L, the concentration is medium, and the COD value is more than 80mg/L and less than or equal to 200mg/L, and the concentration is high; for low-concentration industrial wastewater, only performing magnetic coagulation precipitation to obtain final effluent; for the medium-concentration industrial wastewater, firstly lifting, and then sequentially carrying out deep oxidation, degassing and magnetic coagulation precipitation to obtain final effluent; for high-concentration industrial wastewater, firstly lifting, and then sequentially carrying out catalytic pre-reduction, deep oxidation, degassing and magnetic coagulation precipitation to obtain final effluent; the invention can simplify the advanced treatment process of the industrial wastewater and reduce the treatment cost of the industrial wastewater on the premise of ensuring that the final effluent reaches the standard, effectively improves the efficiency of subsequent advanced oxidation, reduces the dosage of agents such as ferrous sulfate heptahydrate, hydrogen peroxide and alkali during the advanced oxidation, and reduces the cost of the agents.
Description
Technical Field
The invention belongs to the field of industrial wastewater treatment, and particularly relates to a grading advanced treatment process for industrial wastewater with variable fluctuation water quality.
Background
The industrial wastewater generally has the characteristics of complex pollutant components, high pollutant concentration, more toxic substances and nonbiodegradable substances, larger water quality fluctuation and the like; therefore, compared with domestic sewage, the treatment difficulty of industrial wastewater is higher; biochemical treatment (activated sludge process, biofilm process, etc.) is widely used for industrial wastewater treatment due to its advantages of good economy, simple technical process, etc.; however, industrial wastewater is only biochemically treated and is often difficult to reach the standard for discharge, so that biochemically treated industrial wastewater is often subjected to advanced treatment; at present, the industrial wastewater advanced treatment process mainly comprises a Fenton oxidation process, an ozone oxidation process, an activated carbon adsorption process, a reverse osmosis process and the like.
However, the ozone oxidation, activated carbon adsorption, reverse osmosis and other processes have weak capacity of resisting the fluctuation and impact of the quality of inlet water, although the fenton oxidation process can adapt to the impact of the fluctuation of the quality of inlet water by adjusting the adding amount of a medicament, even for industrial wastewater with good quality of inlet water, the fenton oxidation process still needs to add medicaments such as sulfuric acid, ferrous sulfate, hydrogen peroxide, alkali and the like due to the process principle, so that when the quality of inlet water is good, the economy of treating the wastewater is poor; in addition, in the Fenton oxidation process, the industrial wastewater is not subjected to catalytic pre-reduction, and the industrial wastewater is subjected to oxidative degradation only by using ferrous sulfate and hydrogen peroxide, so that the degradation efficiency of pollutants in the industrial wastewater is relatively low.
The solid catalytic material I involved in the invention is a solid catalytic material disclosed in the patent number CN201510308365.5, and the solid catalytic material II is a solid catalytic material disclosed in the patent number CN 201510308407.5.
Disclosure of Invention
The invention aims to provide a system and a method for grading and advanced treatment of industrial wastewater with variable fluctuation water quality; when the quality of the inlet water of the industrial wastewater fluctuates greatly, a grading treatment method is adopted, namely different treatment lines are adopted for the industrial wastewater with different concentrations in the same set of industrial wastewater advanced treatment system; thereby simplifying the advanced treatment process of the industrial wastewater and reducing the treatment cost of the industrial wastewater on the premise of ensuring that the final effluent reaches the standard.
In order to achieve the purpose, the invention provides the following technical scheme:
a grading advanced treatment process for water quality industrial wastewater with variable fluctuation comprises the following steps:
firstly, classifying the industrial wastewater according to COD value, wherein COD which is more than 50mg/L and less than or equal to 60mg/L is low-concentration industrial wastewater, COD which is more than 60mg/L and less than or equal to 80mg/L is medium-concentration industrial wastewater, and COD which is more than 80mg/L and less than or equal to 200mg/L is high-concentration industrial wastewater;
for low-concentration industrial wastewater, only performing magnetic coagulation precipitation to obtain final effluent;
for the medium-concentration industrial wastewater, firstly lifting, and then sequentially carrying out deep oxidation, degassing and magnetic coagulation precipitation to obtain final effluent;
for high-concentration industrial wastewater, the high-concentration industrial wastewater is firstly lifted, and then is sequentially subjected to catalytic pre-reduction, deep oxidation, degassing and magnetic coagulation precipitation to obtain final effluent.
As a preferred embodiment of the present invention, further:
according to the grading advanced treatment process for the low-concentration industrial wastewater with variable fluctuation water quality, when the low-concentration industrial wastewater is subjected to magnetic coagulation sedimentation, 30-80ppm of powdered activated carbon is firstly added into the wastewater, fully mixed with the wastewater and reacted for 5-60min, then 30-100ppm of polyaluminium chloride is added, fully mixed with the wastewater and reacted for 3-15min, then 50-400ppm of magnetic powder is added, fully mixed and reacted for 3-15min, and finally 1-5ppm of polyacrylamide is added, fully mixed and reacted for 3-15 min;
for medium-concentration industrial wastewater and high-concentration industrial wastewater, during magnetic coagulation, adding 50-200ppm of magnetic powder without adding powdered activated carbon and polyaluminium chloride, fully mixing and reacting for 3-15min, then adding 1-5ppm of polyacrylamide, fully mixing and reacting for 3-15min, and precipitating to obtain supernatant, namely final effluent.
According to the grading advanced treatment process for the industrial wastewater with variable fluctuation water quality, acid acidification is not added during advanced oxidation of medium-concentration industrial wastewater, concentrated sulfuric acid is added for acidification during catalytic pre-reduction of high-concentration industrial wastewater, and the pH =2.0-5.0 of the wastewater is controlled.
In the advanced treatment process for the industrial wastewater with variable fluctuation water quality grades, the catalytic pre-reduction is carried out in a catalytic pre-reduction reactor, preferably, an SKL-reactor I type disclosed in the patent number CN201521126007.4 with the patent name of 'an SKL-three-phase catalytic oxidation reactor' is applied;
when the catalytic pre-reduction is carried out, the solid catalytic material I is used and is filled into a catalytic pre-reduction reactor, the filling volume accounts for 30-80% of the effective volume of the catalytic pre-reduction reactor, and the retention/reaction time of the wastewater in the catalytic pre-reduction reactor is 5-30 min.
In the advanced treatment process for the industrial wastewater with variable fluctuation water quality grading, the advanced oxidation is carried out in an advanced oxidation reactor, preferably, an SKL-reactor II type disclosed in the patent name of 'an SKL-three-phase catalytic oxidation reactor' with the patent number of 'CN 201521126007.4' is applied;
when deep oxidation is carried out, ferrous sulfate heptahydrate, hydrogen peroxide and a solid catalytic material II are used, the solid catalytic material II is filled into a deep oxidation reactor, the filling volume accounts for 30-80% of the effective volume of the deep oxidation reactor, and the retention/reaction time of wastewater in the deep oxidation reactor is 5-30 min; ferrous sulfate heptahydrate and hydrogen peroxide are added into a water inlet before wastewater enters the deep oxidation reactor, the adding amount of the ferrous sulfate heptahydrate is 50-600ppm, and the adding amount of the hydrogen peroxide (27.5% mass concentration) is 50-400 ppm.
In the advanced treatment process for the industrial wastewater with variable fluctuation water quality, before the magnetic coagulation sedimentation, either one or two of sodium hydroxide or calcium hydroxide is added into the high-concentration industrial wastewater to neutralize the wastewater, the pH of the wastewater is controlled to be 6.0-9.0, and before the magnetic coagulation sedimentation, alkali is not added into the medium-concentration industrial wastewater and the low-concentration industrial wastewater to neutralize.
The lifting operation is carried out in a wastewater lifting tank, and the wastewater lifting tank is used for stabilizing the water quality and the water quantity and conveying the industrial wastewater into a catalytic pre-reduction reactor or a deep oxidation reactor after lifting; the catalytic pre-reduction reactor is used for catalytically reducing pollutants which are difficult to oxidize and degrade in the industrial wastewater into pollutants which are easy to oxidize and degrade or micromolecular pollutants; the deep oxidation reactor is used for oxidizing and degrading pollutants in the industrial wastewater; the degassing operation is used for removing free carbon dioxide in the industrial wastewater; the magnetic coagulation sedimentation is carried out in a magnetic coagulation sedimentation tank, and the magnetic coagulation sedimentation tank is used for removing suspended pollutants and partial soluble pollutants in the industrial wastewater.
Compared with the prior art, the invention has the beneficial effects that:
(1) when the inlet water quality of the industrial wastewater fluctuates greatly, different treatment lines are adopted for the industrial wastewater with different concentrations in the same set of industrial wastewater advanced treatment system. Thereby simplifying the advanced treatment process of the industrial wastewater and reducing the treatment cost of the industrial wastewater on the premise of ensuring that the final effluent reaches the standard;
(2) for high-concentration industrial wastewater, catalytic pre-reduction is firstly carried out, so that pollutants which are difficult to oxidize and degrade are catalytically reduced into pollutants which are easy to oxidize and degrade or micromolecular pollutants, the efficiency of subsequent deep oxidation is effectively improved, the adding amount of agents such as ferrous sulfate heptahydrate, hydrogen peroxide, alkali and the like during deep oxidation is reduced, and the adding cost of the agents is reduced.
Drawings
FIG. 1 is a process flow chart of the grading advanced treatment method of the fluctuation variability water quality industrial wastewater.
Detailed Description
For further explanation of the invention, the following detailed description of the invention is provided in conjunction with the examples and the accompanying drawings:
example 1
Taking effluent of an industrial wastewater treatment plant (mainly printing and dyeing wastewater) in a certain Hangzhou industrial park, wherein COD is 147mg/L (high-concentration wastewater), and then respectively adding tap water to prepare wastewater with COD being 73mg/L (medium concentration) and 56mg/L (low concentration).
A grading advanced treatment method for industrial wastewater with variable fluctuation water quality comprises the following specific steps:
(1) for low concentration wastewater with COD of 56mg/L, only magnetic coagulation sedimentation is carried out. The specific operation flow is as follows: firstly adding 50ppm of powdered activated carbon into the wastewater, stirring, mixing and reacting for 10 minutes; then adding 50ppm of polyaluminium chloride, stirring, mixing and reacting for 5 minutes; then adding 200ppm of magnetic powder, stirring and mixing for 5 minutes; and finally, adding 2ppm of polyacrylamide, continuously stirring and mixing for 5 minutes, standing and precipitating after stirring is finished, and obtaining supernatant fluid which is final effluent after precipitation.
(2) For medium-concentration wastewater with COD of 73mg/L, the wastewater is firstly lifted, then is deeply oxidized, is degassed, and finally is subjected to magnetic coagulation sedimentation. The specific operation flow is as follows: the wastewater is lifted by a lift pump, 100ppm ferrous sulfate heptahydrate and 100ppm hydrogen peroxide (27.5 mass percent) are added into a water inlet pipe before the wastewater enters the deep oxidation reactor, then the wastewater enters the deep oxidation reactor for deep oxidation reaction, the residence/reaction time is 15 minutes, and a bulk catalytic material II accounting for 30 percent of the effective volume of the deep oxidation reactor is filled in the deep oxidation reactor. And after the deep oxidation reaction is finished, aerating the wastewater for 40 minutes to remove free carbon dioxide in the wastewater. And adding 200ppm of magnetic powder into the wastewater, stirring and mixing for 5 minutes, adding 1ppm of polyacrylamide, stirring for 5 minutes, standing and precipitating after stirring is finished, and obtaining supernatant which is the final effluent after precipitation.
(3) For high-concentration wastewater with COD of 147mg/L, the wastewater is firstly lifted, then is subjected to catalytic pre-reduction, then is subjected to deep oxidation, is degassed, and finally is subjected to magnetic coagulation precipitation. The specific operation flow is as follows: the method comprises the steps of firstly lifting the wastewater by using a lifting pump, adding concentrated sulfuric acid, adjusting the pH value of the wastewater to about 3.5, then enabling the wastewater to enter a catalytic pre-reduction reactor, wherein the staying/reaction time is 15 minutes, 300ppm of ferrous sulfate heptahydrate and 300ppm of hydrogen peroxide (27.5 mass percent) are added into a water inlet pipe before the wastewater enters a deep oxidation reactor, then enabling the wastewater to enter the deep oxidation reactor for deep oxidation reaction, wherein the staying/reaction time is 15 minutes, and a bulk catalytic material II accounting for 30 percent of the effective volume of the deep oxidation reactor is filled into the deep oxidation reactor. And after the deep oxidation reaction is finished, aerating the wastewater for 40 minutes to remove free carbon dioxide in the wastewater. And then adding alkali into the wastewater, adjusting the pH value of the wastewater to about 7.0, adding 200ppm of magnetic powder into the wastewater, stirring and mixing for 5 minutes, adding 1ppm of polyacrylamide, stirring for 5 minutes, standing and precipitating after the stirring is finished, and obtaining supernatant which is final effluent after precipitation.
The quality of the effluent of the industrial wastewater treated by the method of example 1 is shown in table 1:
TABLE 1
| Type of water quality | Water COD (mg/L) | COD of effluent (mg/L) |
| Low concentration waste water | 56 | 41 |
| Medium concentration waste water | 73 | 44 |
| High concentration waste water | 147 | 44 |
Example 2
Taking effluent of an industrial wastewater treatment plant (industrial wastewater mainly comprises chemical wastewater) of a Shaoxing certain industrial park after biochemical treatment, wherein COD is 141mg/L, and then respectively adding tap water to prepare wastewater with COD of 52mg/L (low concentration), 62mg/L (medium concentration) and 81mg/L (high concentration).
A grading advanced treatment method for industrial wastewater with variable fluctuation water quality comprises the following specific steps:
(1) for low concentration wastewater with COD of 52mg/L, only magnetic coagulation sedimentation is carried out. The specific operation flow is as follows: adding 40ppm of powdered activated carbon into the wastewater, stirring, mixing and reacting for 30 minutes; then adding 50ppm of polyaluminium chloride, stirring, mixing and reacting for 5 minutes; adding 300ppm of magnetic powder, stirring and mixing for 5 minutes; and finally adding 3ppm of polyacrylamide, continuously stirring and mixing for 5 minutes, standing and precipitating after stirring is finished, and obtaining supernatant fluid which is final effluent after precipitation.
(2) For medium-concentration wastewater with COD of 62mg/L, the wastewater is firstly lifted, then is deeply oxidized, is degassed, and finally is subjected to magnetic coagulation sedimentation. The specific operation flow is as follows: the method comprises the steps of firstly lifting the wastewater by using a lifting pump, adding 80ppm ferrous sulfate heptahydrate and 80ppm hydrogen peroxide (27.5 mass percent) into a water inlet pipe before the wastewater enters a deep oxidation reactor, then enabling the wastewater to enter the deep oxidation reactor for deep oxidation reaction, wherein the retention/reaction time is 15 minutes, and filling a bulk catalytic material II which accounts for 60 percent of the effective volume of the deep oxidation reactor into the deep oxidation reactor. And after the deep oxidation reaction is finished, aerating the wastewater for 40 minutes to remove free carbon dioxide in the wastewater. And adding 200ppm of magnetic powder into the wastewater, stirring and mixing for 5 minutes, adding 2ppm of polyacrylamide, stirring for 5 minutes, standing and precipitating after stirring is finished, and obtaining supernatant which is the final effluent after precipitation.
(3) For high-concentration wastewater with COD of 81mg/L, the wastewater is firstly lifted, then is subjected to catalytic pre-reduction, then is subjected to deep oxidation, is degassed, and finally is subjected to magnetic coagulation precipitation. The specific operation flow is as follows: the method comprises the steps of firstly lifting the wastewater by using a lifting pump, adding concentrated sulfuric acid, adjusting the pH value of the wastewater to about 3.5, then enabling the wastewater to enter a catalytic pre-reduction reactor, wherein the retention/reaction time is 15 minutes, 150ppm of ferrous sulfate heptahydrate and 150ppm of hydrogen peroxide (27.5 mass percent) are added into a water inlet pipe before the wastewater enters a deep oxidation reactor, then enabling the wastewater to enter the deep oxidation reactor for deep oxidation reaction, wherein the retention/reaction time is 15 minutes, and the deep oxidation reactor is filled with a bulk catalytic material II which accounts for 60 percent of the effective volume of the deep oxidation reactor. And after the deep oxidation reaction is finished, aerating the wastewater for 40 minutes to remove free carbon dioxide in the wastewater. And then adding alkali into the wastewater, adjusting the pH value of the wastewater to about 7.0, adding 200ppm of magnetic powder into the wastewater, stirring and mixing for 5 minutes, adding 2ppm of polyacrylamide, stirring for 5 minutes, standing and precipitating after stirring is finished, and obtaining supernatant which is final effluent after precipitation.
The quality of the effluent of the industrial wastewater treated by the method of example 2 is shown in table 2:
TABLE 2
| Type of water quality | Water COD (mg/L) | COD of effluent (mg/L) |
| Low concentration waste water | 52 | 38 |
| Medium concentration waste water | 62 | 42 |
| High concentration waste water | 81 | 45 |
Example 3
Effluent obtained after biochemical treatment of an industrial wastewater treatment plant (mainly printing and dyeing industrial wastewater) in certain Shaoxing industrial park is taken, COD is 195mg/L, and tap water is added to prepare wastewater with COD being 80mg/L (medium concentration) and 60mg/L (low concentration).
A grading advanced treatment method for industrial wastewater with variable fluctuation water quality comprises the following specific steps:
(1) for low concentration wastewater with COD of 60mg/L, only magnetic coagulation sedimentation is carried out. The specific operation flow is as follows: adding 60ppm of powdered activated carbon into the wastewater, stirring, mixing and reacting for 10 minutes; then adding 50ppm of polyaluminium chloride, stirring, mixing and reacting for 5 minutes; then adding 400ppm of magnetic powder, stirring and mixing for 5 minutes; and finally, adding 5ppm of polyacrylamide, continuously stirring and mixing for 5 minutes, standing and precipitating after stirring is finished, and obtaining supernatant fluid which is the final effluent after precipitation.
(2) For medium-concentration wastewater with COD of 80mg/L, the wastewater is firstly lifted, then is deeply oxidized, is degassed, and finally is subjected to magnetic coagulation sedimentation. The specific operation flow is as follows: the method comprises the steps of firstly lifting the wastewater by using a lifting pump, adding 150ppm ferrous sulfate heptahydrate and 150ppm hydrogen peroxide (27.5 mass percent) into a water inlet pipe before the wastewater enters a deep oxidation reactor, then enabling the wastewater to enter the deep oxidation reactor for deep oxidation reaction, wherein the retention/reaction time is 30 minutes, and a bulk catalytic material II accounting for 80 percent of the effective volume of the deep oxidation reactor is filled in the deep oxidation reactor. And after the deep oxidation reaction is finished, aerating the wastewater for 40 minutes to remove free carbon dioxide in the wastewater. And adding 200ppm of magnetic powder into the wastewater, stirring and mixing for 5 minutes, adding 4ppm of polyacrylamide, stirring for 5 minutes, standing and precipitating after stirring is finished, and obtaining supernatant which is the final effluent after precipitation.
(3) For high-concentration wastewater with the COD of 195mg/L, the wastewater is firstly lifted, then is subjected to catalytic pre-reduction, then is subjected to deep oxidation, is degassed, and finally is subjected to magnetic coagulation precipitation. The specific operation flow is as follows: the method comprises the steps of firstly lifting the wastewater by using a lifting pump, adding concentrated sulfuric acid, adjusting the pH value of the wastewater to about 3.5, then enabling the wastewater to enter a catalytic pre-reduction reactor, wherein the retention/reaction time is 30 minutes, 400ppm of ferrous sulfate heptahydrate and 400ppm of hydrogen peroxide (27.5 mass percent) are added into a water inlet pipe before the wastewater enters a deep oxidation reactor, then enabling the wastewater to enter the deep oxidation reactor for deep oxidation reaction, wherein the retention/reaction time is 30 minutes, and the deep oxidation reactor is filled with a bulk catalytic material II which accounts for 80 percent of the effective volume of the deep oxidation reactor. And after the deep oxidation reaction is finished, aerating the wastewater for 40 minutes to remove free carbon dioxide in the wastewater. And then adding alkali into the wastewater, adjusting the pH value of the wastewater to about 7.0, adding 200ppm of magnetic powder into the wastewater, stirring and mixing for 5 minutes, adding 4ppm of polyacrylamide, stirring for 5 minutes, standing and precipitating after the stirring is finished, and obtaining supernatant which is final effluent after precipitation.
The quality of the effluent of the industrial wastewater treated by the method of example 3 is shown in table 3:
TABLE 3
| Type of water quality | Water COD (mg/L) | COD of effluent (mg/L) |
| Low concentration waste water | 60 | 40 |
| Medium concentration waste water | 80 | 36 |
| High concentration waste water | 195 | 47 |
Example 4
The invention also provides a grading advanced treatment system for the industrial wastewater with variable fluctuation water quality, which consists of a wastewater lifting tank, a catalytic pre-reduction reactor, a deep oxidation reactor, a degassing tank and a magnetic coagulation sedimentation tank, wherein the wastewater lifting tank is connected with the catalytic pre-reduction reactor, the catalytic pre-reduction reactor is connected with the deep oxidation reactor, the deep oxidation reactor is connected with the degassing tank, and the degassing tank is connected with the magnetic coagulation sedimentation tank.
The hydraulic retention time of the wastewater in the lifting tank is 45 minutes, the wastewater is pumped into a catalytic pre-reduction reactor through a lifting pump, a solid catalytic material I is filled in the catalytic pre-reduction reactor, and the hydraulic retention time of the wastewater is 30 minutes. Wastewater in the catalytic pre-reduction reactor automatically flows into the deep oxidation reactor, a solid catalytic material II is filled in the deep oxidation reactor, and the wastewater hydraulically stays for 30 minutes. Wastewater in the deep oxidation reactor automatically flows into a degassing pool, an aeration device is arranged in the degassing pool, and the hydraulic retention time of the wastewater is 40 minutes. Wastewater in the degassing tank automatically flows into a magnetic coagulation sedimentation tank, the magnetic coagulation sedimentation tank is divided into a stirring mixing area and a sedimentation area, wherein the wastewater in the stirring mixing area stays for 20 minutes in a hydraulic mode, the hydraulic retention time in the sedimentation area is 10 minutes, and supernatant after magnetic coagulation sedimentation is final effluent.
Claims (6)
1. A grading advanced treatment process for water quality industrial wastewater with variable fluctuation is characterized by comprising the following steps:
firstly, classifying the industrial wastewater according to COD value, wherein COD which is more than 50mg/L and less than or equal to 60mg/L is low-concentration industrial wastewater, COD which is more than 60mg/L and less than or equal to 80mg/L is medium-concentration industrial wastewater, and COD which is more than 80mg/L and less than or equal to 200mg/L is high-concentration industrial wastewater;
for low-concentration industrial wastewater, only performing magnetic coagulation precipitation to obtain final effluent;
for the medium-concentration industrial wastewater, firstly lifting, and then sequentially carrying out deep oxidation, degassing and magnetic coagulation precipitation to obtain final effluent;
for high-concentration industrial wastewater, the high-concentration industrial wastewater is firstly lifted, and then is sequentially subjected to catalytic pre-reduction, deep oxidation, degassing and magnetic coagulation precipitation to obtain final effluent.
2. The grading advanced treatment process for the industrial wastewater with variable fluctuation water quality according to claim 1, characterized in that for the low-concentration industrial wastewater, during magnetic coagulation sedimentation, 30-80ppm of powdered activated carbon is added into the wastewater, fully mixed with the wastewater and reacted for 5-60min, 30-100ppm of polyaluminium chloride is added, fully mixed with the wastewater and reacted for 3-15min, 50-400ppm of magnetic powder is added, fully mixed and reacted for 3-15min, 1-5ppm of polyacrylamide is added, fully mixed and reacted for 3-15min, and the supernatant obtained after sedimentation is the final effluent;
for medium-concentration industrial wastewater and high-concentration industrial wastewater, during magnetic coagulation, adding 50-200ppm of magnetic powder without adding powdered activated carbon and polyaluminium chloride, fully mixing and reacting for 3-15min, then adding 1-5ppm of polyacrylamide, fully mixing and reacting for 3-15min, and precipitating to obtain supernatant, namely final effluent.
3. The graded advanced treatment process of the industrial wastewater with variable water quality according to claim 1, characterized in that acid is not added for acidification during advanced oxidation for medium-concentration industrial wastewater, concentrated sulfuric acid is added for acidification during catalytic pre-reduction for high-concentration industrial wastewater, and the pH of the wastewater is controlled to be = 2.0-5.0.
4. The advanced stage treatment process for industrial wastewater with variable fluctuation water quality as claimed in claim 1, wherein the catalytic pre-reduction is carried out in a catalytic pre-reduction reactor, a solid catalytic material I is used in the catalytic pre-reduction reactor, the solid catalytic material I is filled in the catalytic pre-reduction reactor, the filling volume accounts for 30% -80% of the effective volume of the catalytic pre-reduction reactor, and the retention/reaction time of wastewater in the catalytic pre-reduction reactor is 5-30 min.
5. The graded advanced treatment process for the industrial wastewater with variable water quality according to claim 1, characterized in that the advanced oxidation is carried out in an advanced oxidation reactor, ferrous sulfate heptahydrate, hydrogen peroxide and a solid catalytic material II are used when the advanced oxidation is carried out, the solid catalytic material II is loaded in the advanced oxidation reactor, the loading volume accounts for 30-80% of the effective volume of the advanced oxidation reactor, and the retention/reaction time of the wastewater in the advanced oxidation reactor is 5-30 min; ferrous sulfate heptahydrate and hydrogen peroxide are added into a water inlet before wastewater enters the deep oxidation reactor, the adding amount of the ferrous sulfate heptahydrate is 50-600ppm, and the adding amount of the hydrogen peroxide (27.5% mass concentration) is 50-400 ppm.
6. The advanced treatment process for classifying industrial wastewater with variable water quality according to claim 1, wherein the industrial wastewater with high concentration is neutralized by adding either or both of sodium hydroxide and calcium hydroxide before the magnetic coagulation sedimentation, the pH of the wastewater is controlled to be 6.0-9.0, and the industrial wastewater with medium concentration and the industrial wastewater with low concentration are neutralized without adding alkali before the magnetic coagulation sedimentation.
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| CN104888822A (en) * | 2015-06-04 | 2015-09-09 | 南京神克隆科技有限公司 | Advanced treatment composite catalyst for industrial wastewater as well as preparation method and application thereof |
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| CN110451616A (en) * | 2019-07-31 | 2019-11-15 | 青岛洛克环保科技有限公司 | A kind of the materialization sewage disposal system and method for synchronous removal COD and total phosphorus |
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