CN110668649A - Corrugated paper pulping wastewater treatment system and process - Google Patents
Corrugated paper pulping wastewater treatment system and process Download PDFInfo
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Abstract
The invention discloses a corrugated paper pulping wastewater treatment system and process, and relates to the field of papermaking wastewater treatment. The technical key points are as follows: comprises a physicochemical treatment device, a biochemical treatment device and an advanced treatment device which are sequentially communicated through pipelines; the physicochemical treatment device comprises a water collecting tank, an inclined filter screen and a primary sedimentation tank which are sequentially communicated; the biochemical treatment device comprises a pre-acidification tank, a circulating anaerobic reactor, an anaerobic sedimentation tank, a biological selection tank, a jet aeration oxidation tank, a secondary sedimentation tank and a sludge concentration tank which are connected in sequence through pipelines; the advanced treatment device comprises an intermediate water tank, a Fenton oxidation tank, a degassing adjusting tank, a coagulation reaction tank and a coagulation sedimentation tank which are sequentially connected through pipelines; the primary sedimentation tank is communicated with the pre-acidification tank, and the secondary sedimentation tank is communicated with the intermediate water tank. The invention has the advantages of grading treatment and grading recycling of wastewater and reduction of production cost.
Description
Technical Field
The invention relates to the field of papermaking wastewater treatment, in particular to a corrugated paper pulping wastewater treatment system and a corrugated paper pulping wastewater treatment process.
Background
The paper is lighter than wooden box, and has hardness and size easy to cut, so that it can protect other packed products from damage. The paper can be printed with different color patterns and characters or written with characters and symbols, and the cost is relatively low. As the necessary equipment for producing corrugated boards, the corrugated board production line plays an important role in the production and processing process of the corrugated boards; in the process of producing and processing corrugated boards by using a corrugated board production line, the corrugated board production line can produce a large amount of sewage, and in order to avoid the pollution to the environment caused by the direct discharge of the sewage into the environment, corrugated board manufacturers must perform centralized treatment on the sewage.
In recent years, closed circulation and zero discharge technology of papermaking wastewater has become an important direction for the technical research of papermaking wastewater. The closed circulation and zero discharge of the papermaking wastewater mainly mean that the wastewater is recycled after being treated, the recycled wastewater can be used for cleaning a filter screen, papermaking equipment and a workshop in a pulp flowing process and can also be used as a solvent in a pulping process, the recycled wastewater can select water quality of different standards according to purposes, if the requirement on the water quality of the solvent in the pulping process is low, the papermaking wastewater can be directly recycled after being simply treated, the requirement on the water quality for cleaning the filter screen in the papermaking workshop is high, the papermaking wastewater can be washed clean only by the water quality reaching the standard without influencing the paper quality, the part of wastewater treatment process is long, and the treatment difficulty is high.
At present, the common papermaking wastewater is recycled, only the wastewater is recycled after being treated at one time, and the wastewater is not subjected to graded treatment and graded recycling, so that the standards of recycled water are the same, the requirements on wastewater treatment equipment are increased, the treatment period is longer, the treatment capacity is large, the investment is high, the process is not easy to control, and the sludge is transported outside after being intensively prepared into a mud cake without direct recycling, so that the energy waste is indirectly caused, and the production cost is increased.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a corrugated paper pulping wastewater treatment system which has the advantages of grading wastewater, grading and recycling wastewater and reducing production cost.
The second purpose of the invention is to provide a process for treating the corrugated paper pulping wastewater, which has the advantages of grading and recycling the wastewater and reducing the production cost.
In order to achieve the first object, the invention provides the following technical scheme:
a corrugated paper pulping wastewater treatment system comprises a physicochemical treatment device, a biochemical treatment device and an advanced treatment device which are sequentially communicated through pipelines;
the physicochemical treatment device comprises a water collecting tank, an inclined filter screen and a primary sedimentation tank which are sequentially communicated;
the biochemical treatment device comprises a pre-acidification tank, a circulating anaerobic reactor, an anaerobic sedimentation tank, a biological selection tank, a jet aeration oxidation tank, a secondary sedimentation tank and a sludge concentration tank which are sequentially connected through pipelines;
the advanced treatment device comprises an intermediate water tank, a Fenton oxidation tank, a degassing adjusting tank, a coagulation reaction tank and a coagulation sedimentation tank which are sequentially connected through pipelines;
the primary sedimentation tank is communicated with the pre-acidification tank, and the secondary sedimentation tank is communicated with the intermediate water tank;
the primary sedimentation tank is communicated with the sludge concentration tank through a first sludge pipe, the secondary sedimentation tank is communicated with the sludge concentration tank through a second sludge pipe, the coagulating sedimentation tank is communicated with the sludge concentration tank through a third sludge pipe, and the biological selection tank is communicated with the second sludge pipe through a return sludge pipe.
Through adopting above-mentioned technical scheme, the preliminary sedimentation tank still has the effect of equalizing basin except that having the precipitation effect, adjustable quality of water, water yield, still has a certain amount of suspended solid behind the waste water through oblique filter screen, and these suspended solids have adverse effect to biological treatment, and in order to guarantee biological treatment's effect, adopt the radial flow formula sedimentation tank that has good mixture and precipitation effect as the preliminary sedimentation tank, waste water is through this technology processing back, and the clarification waste water flows into hydrolysis-acidification tank, and the sedimentation mud is sent into the concentrated tank and is handled.
The pre-acidification tank plays a role in stabilizing organic load of wastewater and adjusting fluctuation, meanwhile, the pre-acidification creates a certain facultative environment for sewage to carry out hydrolytic acidification, and decomposes substances which are difficult to degrade into organic substrates which are easy to degrade, and in order to accurately ensure the pH condition required by the wastewater entering the anaerobic reactor, the pH is adjusted to 6.8-7.2 through PLC control according to the pH condition fed back by on-line monitoring in the tank. Meanwhile, nutrient salt required by anaerobic reaction is added in the process.
The circulating anaerobic reactor is also called HSASB anaerobic reactor, the effluent of the circulating anaerobic reactor overflows under the action of gravity, under the condition of ensuring constant inflow, one part of effluent is distributed into a circulating water tank through a vertical pipe of the anaerobic reactor and mixed with the inflow, the other part of effluent overflows into a subsequent biological selection tank, the pH and the temperature of the effluent of the circulating anaerobic reactor are continuously monitored, and a gas-liquid separator at the top of the reactor is provided with a liquid level controller which can generate a high-level alarm if the liquid level is overhigh.
The waste water from the circular anaerobic reactor and the activated sludge returned from the secondary sedimentation tank are mixed and contacted with each other in the biological selection tank, the microorganism growth condition is created in the biological selection tank, the flocculating bacteria are selected, and the running stability of the biological system is improved.
The jet aeration oxidation tank is annular, a low-pressure jet aeration system is adopted in an aeration mode, and BOD and COD in the wastewater are degraded by means of the adsorption of aerobic microorganisms and the degradation of organic matters in the jet aeration oxidation tank.
The secondary sedimentation tank separates the treated wastewater and activated sludge from the mixed liquor, the clarified wastewater is discharged to an intermediate water tank, the activated sludge is pumped to the biological selection tank and mixed with the wastewater of the circulating anaerobic reactor, and then the mixed wastewater enters the incident flow aeration oxidation tank, so that a part of sludge can be recycled, the cost is reduced, and the residual sludge is sent to a sludge concentration tank for treatment.
The intermediate water tank is used as a regulating tank, and the water in the secondary sedimentation tank is gathered and then pumped into a Fenton oxidation tank for advanced treatment. The Fenton oxidation tank is added with ferrous sulfate and hydrogen peroxide to form a Fenton catalytic oxidation system, organic matters in the wastewater are further oxidized or mineralized into carbon dioxide and water, and pollutants in the wastewater are reduced.
The degassing adjusting tank adjusts the pH value in the wastewater back to a neutral range by adding liquid caustic soda, and simultaneously, the oxidation reaction is stopped by stirring and degassing of the stirrer.
After the Fenton reaction is finished, ferrous iron in the system is oxidized into ferric iron which is a good flocculating agent, suspended matters and colloidal substances in the wastewater are flocculated by adding a coagulant aid PAM and are precipitated by a coagulation sedimentation tank, and the water quality is further purified. And the sludge in the coagulating sedimentation tank is discharged into a sludge concentration tank by a sludge pump.
The supernatant of the secondary sedimentation tank can be used for corrugated paper production to reduce the using amount of clear water, and the clear water of the coagulating sedimentation tank can be used for occasions with higher water quality requirements, such as cleaning production equipment. The wastewater is treated and recycled in a grading way, and simultaneously, the sludge is recycled, so that the production cost is reduced.
Preferably, the circulating anaerobic reactor is communicated with a gas-liquid separator through a pipeline, the gas-liquid separator is communicated with a water-sealed tank through a pipeline, and the water-sealed tank is connected with a generator through a biogas pipeline.
By adopting the technical scheme, the circulating anaerobic reactor generates methane in the wastewater treatment process, the amount of the generated methane depends on the COD load of the circulating anaerobic reactor, the methane is discharged after being combusted by adopting a high altitude inflammation cabinet in the prior art, waste is caused, and the methane can be used as secondary energy for power generation or sent to a boiler for combustion so as to save fire coal. The biogas utilization comprises desulfurization purification, biogas pressure stabilizing cabinet storage and biogas combustion, wherein biogas collected by a gas-liquid separator at the top of the circulating anaerobic reactor flows to the biogas pressure stabilizing cabinet after desulfurization purification, the biogas pressure stabilizing cabinet enables a gas system to generate 25-30MABAR gauge pressure, so that the internal pressure of the gas system does not need to be changed, the gas level of the biogas pressure stabilizing cabinet is continuously monitored by an ultrasonic level meter, and the purified biogas is used for power generation in a plant to save power consumption.
Preferably, the anaerobic sedimentation tank is communicated with an anaerobic sludge tank through a pipeline, the anaerobic sludge tank is communicated with the circulating anaerobic reactor through a sludge supplement pipe, and a sludge pump is arranged on the sludge supplement pipe.
By adopting the technical scheme, the sludge generated by the anaerobic sludge tank can be supplemented to the circulating anaerobic reactor through the sludge supplementing pipe, so that a part of sludge can be recycled, and the cost is reduced.
More preferably, the lower end of the inclined filter screen is provided with a recycled pulp tank for recycling the fiber pulp.
Through adopting above-mentioned technical scheme, can remain the fiber slurry in the production waste water, oblique filter screen can filter in succession and recycle fiber slurry, reduction in production cost.
More preferably, the secondary sedimentation tank is communicated with a reuse water tank through a pipeline.
By adopting the technical scheme, the supernatant generated by the secondary sedimentation tank is temporarily stored in the reuse water tank, and can be taken from the reuse water tank for use when needed, so that a large amount of supernatant is prevented from flowing to the next procedure, and the burden of subsequent treatment is reduced.
In order to achieve the second object, the invention provides the following technical scheme:
a corrugated paper pulping wastewater treatment process comprises the following steps:
step one, feeding the production wastewater into a concentration tank, and filtering through an inclined filter screen to obtain fiber slurry and filtered wastewater;
step two, sending the filtered wastewater to a primary sedimentation tank for primary sedimentation, and removing sludge to obtain supernatant;
step three, sending the supernatant to a pre-acidification tank, adding nutrient salt into the pre-acidification tank, and carrying out acidification treatment;
step four, sending the wastewater after the acidification treatment to a circulating anaerobic reactor, sending the wastewater after the reaction to an anaerobic sedimentation tank for sedimentation, sending sludge into an anaerobic sludge tank, sending the generated methane into a gas-liquid separator, and sending the methane separated from water to a generator for power generation after passing through a water-sealed tank;
step five, sequentially sending the wastewater treated by the anaerobic sedimentation tank to a biological selection tank, a jet aeration oxidation tank and a secondary sedimentation tank, wherein sludge generated by the secondary sedimentation tank flows back to the biological selection tank through a return sludge pipe, and redundant sludge generated by the secondary sedimentation tank and sludge generated by a primary sedimentation tank are sent to a sludge concentration tank;
step six, sending the supernatant of the secondary sedimentation tank to an intermediate water tank and a reuse water tank, wherein the water in the reuse water tank can be used for producing corrugated paper, then sending the sewage of the intermediate water tank to a Fenton oxidation tank, simultaneously adding ferrous sulfate and hydrogen peroxide into the sewage, sending the sewage after reaction to a degassing adjusting tank, and adding liquid caustic soda to adjust the pH value to 7.2-7.5;
and step seven, conveying the sewage after the pH is adjusted to a coagulation reaction tank, adding PAM to carry out flocculation reaction, conveying the sewage after the reaction to a coagulation sedimentation tank to carry out sedimentation to obtain sludge and clear water, conveying the sludge to a sludge concentration tank, and discharging or recycling the clear water after the clear water reaches the standard.
By adopting the technical scheme, the supernatant of the secondary sedimentation tank can be used for corrugated paper production to reduce the using amount of clear water, and the clear water of the coagulating sedimentation tank can be used for occasions with higher water quality requirements, such as cleaning production equipment. The wastewater is treated and recycled in a grading way, simultaneously the sludge is recycled, and the purified methane is used for power generation in a plant, so that the power consumption is saved, and the production cost is reduced.
More preferably, the pH of the wastewater after the acidification treatment in the fourth step is controlled to be 6.8-7.2.
By adopting the technical scheme, the wastewater after the acidification treatment is ensured to meet the conditions required by the circulating anaerobic reactor, and the anaerobic reaction is favorably carried out.
More preferably, the COD of the sewage treated by the circulating anaerobic reactor is not more than 1000.
By adopting the technical scheme, COD is controlled, the normal proceeding of the subsequent reaction is facilitated, and the treated clean water is ensured to meet the recycling requirement.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the supernatant of the secondary sedimentation tank can be used for corrugated paper production to reduce the using amount of clear water, and the clear water of the coagulating sedimentation tank can be used for occasions with higher water quality requirements, such as cleaning production equipment. The wastewater is treated and recycled in a grading way, so that the production cost is reduced.
(2) The secondary sedimentation tank separates the treated wastewater and activated sludge from the mixed liquor, clarified wastewater is discharged to an intermediate water tank, the activated sludge is pumped to the biological selection tank and mixed with the wastewater of the circulating anaerobic reactor, and then enters the incident flow aeration oxidation tank, the sludge generated in the anaerobic sludge tank can be supplemented to the circulating anaerobic reactor through a sludge supplement pipe, a part of sludge can be recycled, the cost is reduced, and the residual sludge is sent to a sludge concentration tank for treatment.
(3) The biogas collected by the gas-liquid separator at the top of the circulating anaerobic reactor flows to a biogas pressure stabilizing cabinet after desulfurization and purification, the pressure stabilizing cabinet enables a gas system to generate a 25-30MABAR gauge pressure, so that the internal pressure of the gas system does not need to be changed, the gas level of the biogas pressure stabilizing cabinet is continuously monitored by an ultrasonic level meter, and the purified biogas is used for power generation in a plant to save power consumption.
Drawings
FIG. 1 is a process flow diagram of corrugated paper pulping wastewater treatment.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: referring to fig. 1, a corrugated paper pulping wastewater treatment system comprises a physicochemical treatment device, a biochemical treatment device and an advanced treatment device which are sequentially communicated through pipelines.
The physicochemical treatment device comprises a water collecting tank, an inclined filter screen and a primary sedimentation tank which are sequentially communicated, wherein the lower end of the inclined filter screen is provided with a recovery pulp tank for recovering fiber pulp, in order to ensure the biological treatment effect, a radial flow type sedimentation tank with good mixing and sedimentation effects is adopted as the primary sedimentation tank, the primary sedimentation tank has the sedimentation effect, also has the function of a regulating tank, and can regulate the water quality and the water quantity.
The biochemical treatment device comprises a pre-acidification tank, a circulating anaerobic reactor, an anaerobic sedimentation tank, a biological selection tank, a jet aeration oxidation tank, a secondary sedimentation tank and a sludge concentration tank which are sequentially connected through pipelines. The pre-acidification tank plays a role in stabilizing organic load of wastewater and regulating fluctuation, and simultaneously creates a certain facultative environment for sewage to carry out hydrolytic acidification so as to decompose substances which are difficult to degrade into organic substrates which are easy to degrade. The circulating anaerobic reactor adopts anaerobic organisms to decompose organic matters and generate methane. The secondary sedimentation tank separates the treated wastewater and activated sludge from the mixed liquor, the clarified wastewater is discharged to an intermediate water tank, the activated sludge is pumped to the biological selection tank and mixed with the wastewater of the circulating anaerobic reactor, and then the mixed wastewater enters the incident flow aeration oxidation tank, so that a part of sludge can be recycled, the cost is reduced, and the residual sludge is sent to a sludge concentration tank for treatment.
The advanced treatment device comprises an intermediate water tank, a Fenton oxidation tank, a degassing adjusting tank, a coagulation reaction tank and a coagulation sedimentation tank which are sequentially connected through pipelines. The intermediate water tank is used as a regulating tank, and the water in the secondary sedimentation tank is gathered and then pumped into a Fenton oxidation tank for advanced treatment. The Fenton oxidation tank is added with ferrous sulfate and hydrogen peroxide to form a Fenton catalytic oxidation system, organic matters in the wastewater are further oxidized or mineralized into carbon dioxide and water, and pollutants in the wastewater are reduced. The degassing adjusting tank adjusts the pH value in the wastewater back to a neutral range by adding liquid caustic soda, and simultaneously, the oxidation reaction is stopped by stirring and degassing of the stirrer. After the Fenton reaction is finished, ferrous iron in the system is oxidized into ferric iron which is a good flocculating agent, suspended matters and colloidal substances in the wastewater are flocculated by adding a coagulant aid PAM and are precipitated by a coagulation sedimentation tank, and the water quality is further purified. And the sludge in the coagulating sedimentation tank is discharged into a sludge concentration tank by a sludge pump.
The supernatant of the secondary sedimentation tank can be used for corrugated paper production to reduce the using amount of clear water, and the clear water of the coagulating sedimentation tank can be used for occasions with higher water quality requirements, such as cleaning production equipment. The wastewater is treated and recycled in a grading way, and simultaneously, the sludge is recycled, so that the production cost is reduced.
The primary sedimentation tank is communicated with the pre-acidification tank, the secondary sedimentation tank is communicated with the intermediate water tank, and the secondary sedimentation tank is communicated with a reuse water tank through a pipeline. The primary sedimentation tank is communicated with the sludge concentration tank through a first sludge pipe, the secondary sedimentation tank is communicated with the sludge concentration tank through a second sludge pipe, the coagulating sedimentation tank is communicated with the sludge concentration tank through a third sludge pipe, and the biological selection tank is communicated with the second sludge pipe through a return sludge pipe. The anaerobic sedimentation tank is communicated with an anaerobic sludge tank through a pipeline, the anaerobic sludge tank is communicated with the circulating anaerobic reactor through a sludge supplement pipe, and a sludge pump is arranged on the sludge supplement pipe. The activated sludge in the secondary sedimentation tank is pumped to the biological selection tank and mixed with the wastewater of the circulating anaerobic reactor, and then enters the incident flow aeration oxidation tank, the sludge generated in the anaerobic sludge tank can be supplemented to the circulating anaerobic reactor through a sludge supplement pipe, so that a part of sludge can be recycled, the cost is reduced, and the residual sludge is sent to a sludge concentration tank for treatment.
In order to recycle the biogas generated by the circulating anaerobic reactor, the circulating anaerobic reactor is communicated with a gas-liquid separator through a pipeline, the gas-liquid separator is communicated with a water-sealed tank through a pipeline, and the water-sealed tank is connected with a generator through a biogas pipeline. The purified methane is used for power generation in a plant, so that the power consumption is saved.
The implementation principle of the embodiment 1 is as follows: feeding the production wastewater into a concentration tank, and filtering through an inclined filter screen to obtain fiber slurry and filtered wastewater; sending the filtered wastewater to a primary sedimentation tank for primary sedimentation, and removing sludge to obtain supernatant; sending the supernatant to a pre-acidification tank, adding nutrient salt into the pre-acidification tank, and carrying out acidification treatment; sending the wastewater after acidification treatment to a circulating anaerobic reactor, sending the wastewater after reaction to an anaerobic sedimentation tank for sedimentation, sending sludge into an anaerobic sludge tank, sending the generated biogas into a gas-liquid separator, sending the biogas after separation of water to a generator for power generation after passing through a water-sealed tank, controlling the pH value of the wastewater after acidification treatment to be 6.8-7.2, and controlling the COD of the wastewater after treatment of the circulating anaerobic reactor to be not more than 1000; the wastewater treated by the anaerobic sedimentation tank is sequentially sent to a biological selection tank, a jet aeration oxidation tank and a secondary sedimentation tank, sludge generated by the secondary sedimentation tank flows back to the biological selection tank through a return sludge pipe, and redundant sludge generated by the secondary sedimentation tank and sludge generated by a primary sedimentation tank are sent to a sludge concentration tank; sending the supernatant of the secondary sedimentation tank to an intermediate tank and a reuse tank, wherein the water in the reuse tank can be used for producing corrugated paper, sending the sewage of the intermediate tank to a Fenton oxidation tank, simultaneously adding ferrous sulfate and hydrogen peroxide into the sewage, sending the sewage after reaction to a degassing adjusting tank, and adding liquid caustic soda to adjust the pH value to 7.2-7.5; and (3) conveying the sewage after pH adjustment to a coagulation reaction tank, adding PAM (polyacrylamide) for flocculation reaction, conveying the sewage after reaction to a coagulation sedimentation tank for sedimentation to obtain sludge and clear water, conveying the sludge to a sludge concentration tank, and discharging or recycling the clear water after the clear water detection reaches the standard.
Example 2: referring to fig. 1, a corrugated paper pulping wastewater treatment process comprises the following steps:
step one, feeding the production wastewater into a concentration tank, and filtering through an inclined filter screen to obtain fiber slurry and filtered wastewater;
step two, sending the filtered wastewater to a primary sedimentation tank for primary sedimentation, and removing sludge to obtain supernatant;
step three, sending the supernatant to a pre-acidification tank, adding nutrient salt into the pre-acidification tank, and carrying out acidification treatment;
step four, sending the wastewater after the acidification treatment to a circulating anaerobic reactor, sending the wastewater after the reaction to an anaerobic sedimentation tank for sedimentation, sending sludge into an anaerobic sludge tank, sending the generated biogas into a gas-liquid separator, sending the biogas after the biogas and the water are separated to a generator for power generation after passing through a water-sealed tank, controlling the pH value of the wastewater after the acidification treatment to be 6.8-7.2, and controlling the COD of the sewage after the treatment of the circulating anaerobic reactor to be not more than 1000;
step five, sequentially sending the wastewater treated by the anaerobic sedimentation tank to a biological selection tank, a jet aeration oxidation tank and a secondary sedimentation tank, wherein sludge generated by the secondary sedimentation tank flows back to the biological selection tank through a return sludge pipe, and redundant sludge generated by the secondary sedimentation tank and sludge generated by a primary sedimentation tank are sent to a sludge concentration tank;
step six, sending the supernatant of the secondary sedimentation tank to an intermediate water tank and a reuse water tank, wherein the water in the reuse water tank can be used for producing corrugated paper, then sending the sewage of the intermediate water tank to a Fenton oxidation tank, simultaneously adding ferrous sulfate and hydrogen peroxide into the sewage, sending the sewage after reaction to a degassing adjusting tank, and adding liquid caustic soda to adjust the pH value to 7.2-7.5;
and step seven, conveying the sewage after the pH is adjusted to a coagulation reaction tank, adding PAM to carry out flocculation reaction, conveying the sewage after the reaction to a coagulation sedimentation tank to carry out sedimentation to obtain sludge and clear water, conveying the sludge to a sludge concentration tank, and discharging or recycling the clear water after the clear water reaches the standard.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The corrugated paper pulping wastewater treatment system is characterized by comprising a physicochemical treatment device, a biochemical treatment device and an advanced treatment device which are sequentially communicated through pipelines;
the physicochemical treatment device comprises a water collecting tank, an inclined filter screen and a primary sedimentation tank which are sequentially communicated;
the biochemical treatment device comprises a pre-acidification tank, a circulating anaerobic reactor, an anaerobic sedimentation tank, a biological selection tank, a jet aeration oxidation tank, a secondary sedimentation tank and a sludge concentration tank which are sequentially connected through pipelines;
the advanced treatment device comprises an intermediate water tank, a Fenton oxidation tank, a degassing adjusting tank, a coagulation reaction tank and a coagulation sedimentation tank which are sequentially connected through pipelines;
the primary sedimentation tank is communicated with the pre-acidification tank, and the secondary sedimentation tank is communicated with the intermediate water tank;
the primary sedimentation tank is communicated with the sludge concentration tank through a first sludge pipe, the secondary sedimentation tank is communicated with the sludge concentration tank through a second sludge pipe, the coagulating sedimentation tank is communicated with the sludge concentration tank through a third sludge pipe, and the biological selection tank is communicated with the second sludge pipe through a return sludge pipe.
2. The corrugated paper pulping wastewater treatment system according to claim 1, wherein the circulating anaerobic reactor is communicated with a gas-liquid separator through a pipeline, the gas-liquid separator is communicated with a water-sealed tank through a pipeline, and the water-sealed tank is connected with a generator through a biogas pipeline.
3. The corrugated paper pulping wastewater treatment system according to claim 1, wherein the anaerobic sedimentation tank is communicated with an anaerobic sludge tank through a pipeline, the anaerobic sludge tank is communicated with the circulating anaerobic reactor through a sludge supplement pipe, and a sludge pump is arranged on the sludge supplement pipe.
4. The corrugated paper pulping wastewater treatment system of claim 1, wherein a recycling pulp tank for recycling fiber pulp is arranged at the lower end of the inclined filter screen.
5. The corrugated paper pulping wastewater treatment system of claim 1, wherein the secondary sedimentation tank is communicated with a reuse water tank through a pipeline.
6. The corrugated paper pulping wastewater treatment process is characterized by comprising the following steps:
step one, feeding the production wastewater into a concentration tank, and filtering through an inclined filter screen to obtain fiber slurry and filtered wastewater;
step two, sending the filtered wastewater to a primary sedimentation tank for primary sedimentation, and removing sludge to obtain supernatant;
step three, sending the supernatant to a pre-acidification tank, adding nutrient salt into the pre-acidification tank, and carrying out acidification treatment;
step four, sending the wastewater after the acidification treatment to a circulating anaerobic reactor, sending the wastewater after the reaction to an anaerobic sedimentation tank for sedimentation, sending sludge into an anaerobic sludge tank, sending the generated methane into a gas-liquid separator, and sending the methane separated from water to a generator for power generation after passing through a water-sealed tank;
step five, sequentially sending the wastewater treated by the anaerobic sedimentation tank to a biological selection tank, a jet aeration oxidation tank and a secondary sedimentation tank, wherein sludge generated by the secondary sedimentation tank flows back to the biological selection tank through a return sludge pipe, and redundant sludge generated by the secondary sedimentation tank and sludge generated by a primary sedimentation tank are sent to a sludge concentration tank;
step six, sending the supernatant of the secondary sedimentation tank to an intermediate water tank and a reuse water tank, wherein the water in the reuse water tank can be used for producing corrugated paper, then sending the sewage of the intermediate water tank to a Fenton oxidation tank, simultaneously adding ferrous sulfate and hydrogen peroxide into the sewage, sending the sewage after reaction to a degassing adjusting tank, and adding liquid caustic soda to adjust the pH value to 7.2-7.5;
and step seven, conveying the sewage after the pH is adjusted to a coagulation reaction tank, adding PAM to carry out flocculation reaction, conveying the sewage after the reaction to a coagulation sedimentation tank to carry out sedimentation to obtain sludge and clear water, conveying the sludge to a sludge concentration tank, and discharging or recycling the clear water after the clear water reaches the standard.
7. The corrugated paper pulping wastewater treatment process according to claim 6, wherein the pH of the wastewater after the acidification treatment in the fourth step is controlled to be 6.8-7.2.
8. The corrugated paper pulping wastewater treatment process according to claim 6, wherein the COD of the wastewater treated by the circulating anaerobic reactor is not more than 1000.
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