CN114275880A - Biochemical treatment method and biochemical treatment device for papermaking wastewater - Google Patents
Biochemical treatment method and biochemical treatment device for papermaking wastewater Download PDFInfo
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Abstract
The application discloses a biochemical treatment method and a biochemical treatment device for papermaking wastewater, wherein the method comprises the following steps: adding a biological antidote to the biochemical pond in the water inlet period; after water is fed, adding mixed liquid of a synergistic microbial inoculum and a biological synergistic nutrient into the biochemical pool in an aeration period, and starting a biochemical treatment system; and adding a biological growth promoting agent into the biochemical pool after the biochemical treatment system is started to supplement nutrient substances for the biochemical treatment system. Through the mode, the removal ability of microorganism to organic pollutant in the waste water can be promoted in this application, the COD of biochemical play water is reduced to reduce the quantity of water purification agent in the follow-up deepening treatment process, in order to realize the purpose of practicing thrift the stable production of cost.
Description
Technical Field
The application relates to the field of papermaking wastewater treatment, in particular to a biochemical treatment method and a biochemical treatment device for papermaking wastewater.
Background
With the development of social economy and the improvement of living standard of people, the requirements of people on environment quality are gradually improved, and the requirements on building good ecological environment are gradually improved, for example, sewage is required to be treated and discharged after reaching the standard, so that the investment of environmental protection needs to be increased while enterprises develop production so as to achieve the purposes of energy conservation, emission reduction, clean production, resource recycling and the like.
In the sewage plant for pulping and papermaking, when waste water is treated, the Chemical Oxygen Demand (COD) of the inlet water and the outlet water of the waste water is generally controlled. The COD is the chemical measurement of the amount of reducing substances to be oxidized in a water sample. In the research of river pollution and industrial wastewater properties and the operation management of wastewater treatment plants, COD is an important organic pollution parameter which can be measured quickly, and the larger the COD value is, the more serious the organic pollution in the wastewater is.
When an upstream workshop (pulping, papermaking, alkali recovery and the like) is shut down to overhaul a cleaning system or carry out process debugging, the quality of wastewater received by the sewage workshop fluctuates greatly, for example, the dissolubility COD is higher, the content of pollutants which can be biochemically degraded is low, so that the sewage workshop runs in an overload mode, the biochemical performance of microorganisms in the biochemical system is poor, the COD fluctuation of biochemical effluent is large, and the stable production and the environmental protection of the subsequent process are not facilitated.
At present, COD (chemical oxygen demand) of a sewage plant is reduced mainly by greatly increasing the using amount of a water purifying agent in an air floatation section of advanced treatment, but the sharp increase of the using amount of the water purifying agent can cause violent chemical cost and limited operation space. Therefore, in order to solve the bottleneck encountered in the actual production, a new method for reducing the COD of the pulping and papermaking wastewater is needed, which can improve the capability of biochemical treatment of the wastewater, thereby ensuring stable production without increasing the chemical cost.
Disclosure of Invention
The technical problem that this application mainly solved provides a biochemical treatment method and biochemical treatment device of papermaking waste water, supplements the essential nutrition of microorganism growth in the biochemical treatment system through adding multiple medicament to optimize the biochemical performance of microorganism, promote the removal ability of biochemical treatment system to organic pollutant.
In order to solve the technical problem, one technical scheme adopted by the application is to provide a biochemical treatment method of papermaking wastewater, which comprises the following steps: adding a biological antidote to the biochemical pond in the water inlet period; after water is fed, adding mixed liquid of a synergistic microbial inoculum and a biological synergistic nutrient into the biochemical pool in an aeration period, and starting a biochemical treatment system; and adding a biological growth promoting agent into the biochemical pool after the biochemical treatment system is started to supplement nutrient substances for the biochemical treatment system.
Wherein, before the step of adding the mixed solution of the synergistic microbial inoculum and the biological synergistic nutrient into the biochemical pool in the aeration period, the method also comprises the following steps: and activating the mixed solution of the synergistic microbial inoculum and the biological synergistic nutrient by a fan.
Wherein, still include before the step of carrying out activation treatment to the mixed solution of synergistic microbial inoculum and biological synergistic nutrient through the fan: the mixed solution of the synergistic microbial inoculum and the biological synergistic nutrient is prepared at least 24 hours ahead of time.
Wherein the aeration period is 3 hours.
Wherein the biological antidote comprises micromolecular organic acid, compound vitamin, microelement and urea; the addition amount of the biological antidote is 0.25-0.5 mg/L.
The synergistic microbial inoculum is simple and easy, and the simple and easy synergistic microbial inoculum comprises microbial cells, bran particles, spores and enzymes; the easily-usable addition amount is 0.2-0.3 mg/L.
The bacterial strain can be used for degrading aromatic compounds, aliphatic compounds, complex carbon chains and other compounds.
Wherein the biological synergistic nutrient comprises biological enzymes, glucose and urea; the addition amount of the biological synergistic nutrient is 0.4-0.7 mg/L.
Wherein the biological growth promoter comprises vitamin complex, glucose and urea; the addition amount of the bio-promoter is 0.2-0.3 mg/L.
In order to solve the above technical problem, another technical solution adopted by the present application is to provide a biochemical treatment apparatus for paper-making wastewater, the apparatus comprising: the biochemical tank is used for biochemically treating the papermaking wastewater; the liquid storage barrel is used for storing a biological antidote, a mixed liquid of a synergistic microbial inoculum and a biological synergistic nutrient and a biological growth promoter respectively; one end of the liquid inlet pipeline is inserted into the biochemical tank, and the other end of the liquid inlet pipeline is inserted into the liquid storage barrel; wherein, the liquid inlet pipeline is connected with a flow pump for leading different medicaments into the biochemical pool.
The beneficial effect of this application is: different from the prior art, the application provides a biochemical treatment method and a biochemical treatment device of papermaking waste water, supplements the essential nutrition for the growth of microorganisms in a biochemical treatment system by adding a certain amount of agents such as biological antidote, synergistic microbial inoculum, biological synergistic nutrient and biological growth promoter, so as to optimize the biochemical performance of the microorganisms, improve the removal capacity of the microorganisms on organic pollutants in the waste water, and improve the impact resistance and the anti-toxicity capacity of the biochemical treatment system, so that the biochemical treatment system can still stably run when the dissolubility COD of the waste water is high. Through the mode, the COD of biochemical effluent can be reduced to this application to effectively reduce the quantity of water purifying agent in the follow-up technology, solved the problem that the production adjustment space that traditional single control method leads to is limited and chemical cost is violent high, can regard as a neotype emergency technology method when sewage overload moves.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of the biochemical treatment method of papermaking wastewater according to the present application;
FIG. 2 is a schematic structural view of a biochemical treatment apparatus for papermaking wastewater according to the present application;
FIG. 3 is a graph showing the change trend of the unit consumption of water purifying agent, the COD of the influent water in the SBR tank and the COD of the effluent water in the SBR tank in examples 1 and 2 and blank control groups 1 and 2.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plural" includes at least two in general, but does not exclude the presence of at least one.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In a sewage plant for pulping and papermaking, sewage is treated by a Sequencing Batch Reactor (SBR) Process, i.e., the produced sewage is subjected to grating to remove large-particle suspended matters and floating matters and then flows into a water collecting and adjusting tank automatically to homogenize water quality and adjust water qualityThe water quantity and the pH value are adjusted, and a submersible stirrer is also arranged in the adjusting tank to keep suspended matters from settling; the sewage after the adjustment treatment is lifted to a high-speed filter by a sewage pump, and the sewage automatically flows into a flocculation tank after part of paper pulp is recycled by the high-speed filter; adding polyaluminium Chloride (PAC) and Polyacrylamide (PAM) into a flocculation tank, stirring by a stirrer, aggregating fine suspended matters in sewage into large suspended matters under the action of an adsorption bridge frame of a flocculating agent, allowing the large suspended matters to flow into a primary sedimentation tank, performing solid-liquid separation on the suspended matters in the primary sedimentation tank, lifting liquid flowing out of the primary sedimentation tank to a cooling tower by a cooling tower water inlet pump, cooling the sewage by the cooling tower, allowing the sewage to enter an SBR tank, performing water inlet, aeration reaction, sedimentation, drainage, sludge discharge and other processes in the SBR tank, and decomposing most organic matters in the sewage into CO under the action of various microorganisms such as facultative, aerobic and anaerobic microorganisms in the SBR tank2And water, the remaining organic matter also serving to complete the microbial proliferation itself. And (3) allowing SBR (sequencing batch reactor) effluent to enter a shallow air floatation tank for advanced treatment, and adding a water purifying agent and PAM (polyacrylamide) into the air floatation tank to further remove suspended matters and partial organic pollutants in the sewage so that the effluent of the air floatation tank reaches the standard and is discharged.
In the sewage plant for pulping and papermaking, when waste water is treated, the Chemical Oxygen Demand (COD) of the inlet water and the outlet water of the waste water is generally controlled. However, when an upstream workshop (pulping, papermaking, alkali recovery and the like) is shut down to overhaul a cleaning system or carry out process debugging, the quality of wastewater received by a sewage workshop fluctuates greatly, for example, the soluble COD is higher, the content of biodegradable pollutants in an SBR pool is low, and toxic substances in the sewage can inhibit the reproduction of microorganisms, so that the biochemical performance of the microorganisms in a biochemical system is poor, and finally, the COD of biochemical effluent fluctuates greatly, which is not beneficial to the stable production and environmental protection of the subsequent process.
At present, COD (chemical oxygen demand) of a sewage plant is reduced mainly by greatly increasing the using amount of a water purifying agent in an air floatation section of advanced treatment, but the sharp increase of the using amount of the water purifying agent can cause violent chemical cost and limited operation space. Therefore, in order to solve the bottleneck encountered in the actual production, a new method for reducing the COD of the pulping and papermaking wastewater is needed, which can improve the capability of biochemical treatment of the wastewater, thereby ensuring stable production without increasing the chemical cost.
Based on the situation, the application provides a biochemical treatment method and a biochemical treatment device of papermaking waste water, supplements the essential nutrition of microorganism growth in the biochemical treatment system through adding multiple medicaments to optimize the biochemical performance of microorganism, promote the removal ability of the biochemical treatment system to organic pollutants, make the COD of biochemical effluent reduce, with the quantity that reduces water purifier in the follow-up technology.
The present application will be described in detail below with reference to the drawings and embodiments.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a biochemical treatment method for papermaking wastewater according to the present application. As shown in fig. 1, in the present embodiment, the method includes:
s11: adding biological antidotes to the biochemical pond during the water intake period.
In the present embodiment, the biochemical tank is referred to as an SBR tank.
Specifically, SBR is a short name of a sequential Batch Reactor Activated Sludge Process (Sequencing Batch Reactor Activated Sludge Process), and is an Activated Sludge sewage treatment technology operating in an intermittent aeration mode.
Wherein, the whole operation process of the SBR process comprises 5 stages: 1) a water inlet period; 2) an aeration period; 3) a precipitation period; 4) a draining and mud-discharging period; 5) and (5) an idle period. The operating condition of the SBR process is characterized by intermittent operation, wherein the operation period from water feeding, aeration, sedimentation, water discharging and sludge discharging to the end of an idle period is one operation period.
In this embodiment, the water inlet period refers to a process in which the sewage after the physicochemical treatment enters the biochemical tank after being cooled by the cooling tower.
In this embodiment, the water intake period lasts about 1.5 hours.
In this embodiment, the biological antidote includes small molecule organic acids, vitamins complex, trace elements, and urea.
In the embodiment, the dosage of the biological antidote is 0.25-0.5 mg/L.
Specifically, the biological antidote can remove toxic functional groups of toxic organic matters in the sewage through a non-biological way, adjust the water body of the sewage, and detoxify and shield toxic substances in the water body.
Wherein, the micromolecular organic acid can complex and chelate metal cations in the sewage, so that the metal cations cannot be directly contacted with microorganisms, the microorganisms are prevented from being poisoned by the micromolecular organic acid, and the activity of the microorganisms is ensured.
The compound vitamin can supplement nutrient substances for microorganisms in the sewage and promote the growth of the microorganisms.
Wherein, the microelements are important components for cell synthesis, including Fe, Mn, B, Zn, Mo, Cu, etc.
Wherein the urea is used for adjusting the nitrogen content in the sewage.
After the sewage after the physicochemical treatment is cooled, the sewage enters the SBR tank, and because toxic substances are still contained in the sewage, the sewage can have strong poison and impact on the microorganisms subjected to the biochemical treatment, so that the capability of a biochemical treatment system for removing organic matters in the sewage is reduced.
This application adds biological antidote when intaking, can reduce the influence of quality of water toxicity to the microorganism, improves the whole resistance of microorganism in the water to promote biochemical system's shock resistance and antitoxic ability, further improve the efficiency of getting rid of the pollutant of biochemical system microorganism.
S12: after water is fed, adding mixed liquid of the synergistic microbial inoculum and the biological synergistic nutrient into the biochemical pool in an aeration period, and starting a biochemical treatment system.
In the present embodiment, the aeration period refers to a process of forcibly transferring oxygen in the air into the water body.
Specifically, the aeration step is to make the sewage obtain enough dissolved oxygen, prevent the suspension in the tank from sinking, strengthen the contact between the microorganisms in the SBR tank and the dissolved oxygen, and make the microorganisms in the tank oxidize and decompose the organic matters in the sewage under the condition of sufficient oxygen.
In this embodiment, the aeration period lasts about 3 hours.
In this embodiment, the synergistic microbial inoculum is originally available, and originally available microbial cells, bran particles, spores, and enzymes.
In the present embodiment, the amount of the easily added substance is 0.2 to 0.3 mg/L.
The bacterial strain can be used for degrading aromatic compounds, aliphatic compounds, complex carbon chains and other compounds.
Specifically, the bacterial strain contained in the synergistic microbial inoculum has high tolerance degree on toxic pollutants, good degradation capability on aromatic compounds, aliphatic compounds, complex carbon chains and other compounds, wide applicable temperature range and good metabolic action at the temperature of 25-40 ℃.
In this embodiment, the bio-enhancing nutrients include biological enzymes, glucose, and urea.
In the embodiment, the addition amount of the biological synergistic nutrient is 0.4-0.7 mg/L.
Specifically, the biological synergistic nutrient can replace a conventional carbon source (such as flour) to be added, so that the necessary nutrition for the growth of microorganisms in sewage is supplemented, the metabolic activity of the microorganisms can be greatly improved, the growth and the propagation of the microorganisms are promoted, the respiratory rate of a zoogloea is enhanced, and the removal capacity of the microorganisms on difficultly biochemical pollutants is improved.
The biological enzyme comprises petrifaction enzyme, catalase and the like, the petrifaction enzyme can assist metabolism and absorption of microorganisms, and the peroxidation enzyme can catalyze hydrogen peroxide to decompose the hydrogen peroxide into water and oxygen so as to promote oxygen melting of a water body.
Wherein the glucose is used for supplementing carbon source required by the microorganism.
Wherein the urea is used for adjusting the nitrogen content in the sewage.
The method has the advantages that the original microorganisms in the sewage in the SBR tank have low tolerance degree on toxic pollutants, low decomposition efficiency on the pollutants difficult to degrade and poor biodegradability, and by adding the mixed liquid of the synergistic microbial inoculum and the biological synergistic nutrient to the SBR tank in the aeration period, the domesticated strain with high tolerance degree on the toxic pollutants can be provided, and the biochemical treatment system is quickly started, so that the domesticated strain can specifically degrade the pollutants difficult to degrade; furthermore, the biological synergistic nutrient supplements nutrition, can improve the activity of zoogloea microorganisms in a biochemical system, promote the growth and the propagation of strains, enhance the respiratory rate of zoogloea, improve the removal capacity of the microorganisms to pollutants difficult to be biochemically treated, and improve the defect of slow growth of the microorganisms in sewage.
In this embodiment, before adding the mixed solution of the synergistic microbial inoculum and the biological synergistic nutrient to the SBR tank, the mixed solution of the synergistic microbial inoculum and the biological synergistic nutrient needs to be activated by a fan.
Wherein, the fan is used for giving mixed solution aeration towards oxygen, strengthens the contact of microorganism and dissolved oxygen in the mixed solution, promotes the growth and the reproduction of microorganism.
In this embodiment, the mixed solution of the synergistic microbial agent and the biological synergistic nutrient is prepared at least 24 hours ahead of time.
Specifically, a mixed solution of a synergistic microbial inoculum and a biological synergistic nutrient is prepared 24 hours in advance, and oxygen is supplied by a fan to promote the growth and propagation of microorganisms such as strains, so that the acclimation period of the microorganisms such as the strains in the SBR tank can be shortened, and a biochemical treatment system in the SBR tank can be started when the bacteria are added.
S13: and adding a biological growth promoting agent into the biochemical pool after the biochemical treatment system is started to supplement nutrient substances for the biochemical treatment system.
In this embodiment, the bio-stimulant includes a vitamin complex, glucose, and urea.
In the present embodiment, the addition amount of the bio-stimulant is 0.2 to 0.3 mg/L.
Specifically, the biological growth promoter can promote the growth and propagation of microorganisms, enhance the respiratory rate of zooglea, and improve the removal capacity of the microorganisms on pollutants (ammonia nitrogen compounds, sulfides and the like), so that the zooglea activity of a biochemical system is improved, and the sludge sedimentation performance is improved.
In this embodiment, a biological growth promoter is added to the SBR tank at the same time as the mixed solution of the synergistic agent and the biological synergistic nutrient is added.
In this embodiment, the aeration period lasts about 3 hours.
And further, after the aeration process is finished, the SBR tank enters a precipitation process to precipitate sludge suspended matters generated in the sewage for about 0.5 hour, and after the sludge precipitation is finished, the SBR tank enters a drainage and sludge discharge process.
Wherein, the drainage process refers to that the liquid separated after biochemical treatment in the SBR tank is sent into the air floatation tank through a water outlet pipe.
Specifically, the effluent of the SBR tank needs to be subjected to advanced treatment after entering the floatation tank so as to further remove suspended matters and partial organic pollutants in the sewage, so that the effluent of the floatation tank reaches the standard and is discharged. When the biochemical treatment system in the SBR tank stably runs, the COD value of the biochemical effluent is lower, and the dosage of the water purifying agent added in the subsequent air floatation tank is correspondingly reduced.
Wherein the sludge discharge process refers to that sludge precipitated after biochemical treatment in the SBR tank is conveyed into a sludge concentration tank through a sludge discharge pipe.
Specifically, the sludge enters a sludge mixing tank after being concentrated by a sludge concentrating tank, enters a screw press after the sludge mixing tank finishes reaction, is extruded and dehydrated under the action of the screw press, is compressed and then is discharged by a slag discharge pipe, and can be used as an organic fertilizer to realize the cyclic utilization of resources.
In this embodiment, the SBR tank enters the next operation cycle after completing a whole operation cycle, and is sequentially circulated.
In this embodiment, for promoting the efficiency that SBR pond handled sewage, adopt two sets of or four groups collaborative work's mode operation, this application does not do the restriction to the specific quantity in SBR pond.
Different from the prior art, the biochemical treatment method of the papermaking wastewater provided by the application can supplement microorganisms with degradation capability on organic pollutants in a biochemical treatment system and necessary nutrients for the growth of the microorganisms by adding a certain amount of biological antidote, synergistic microbial inoculum, biological synergistic nutrient, biological growth promoter and other medicaments so as to optimize the biochemical performance of the microorganisms, improve the removal capability of the microorganisms on the organic pollutants in the wastewater, improve the impact resistance and the toxicity resistance of the biochemical treatment system, enable the biochemical treatment system in a biochemical pool to be more stable, enable the biochemical treatment system to stably operate and ensure the biochemical treatment effect when the wastewater is overloaded, and reduce the amount of water purifier in the subsequent deepening treatment process by reducing the COD of biochemical effluent so as to achieve the purpose of saving cost and stable production.
Correspondingly, the application provides a biochemical treatment device for papermaking wastewater.
Specifically, please refer to fig. 2, fig. 2 is a schematic structural diagram of a biochemical treatment apparatus for papermaking wastewater according to the present application. As shown in fig. 2, in the present embodiment, the biochemical treatment apparatus includes a biochemical tank 1, and a liquid storage barrel 2, a liquid storage barrel 3, and a liquid storage barrel 4 connected to the biochemical tank 1 through a liquid inlet pipe 22, a liquid inlet pipe 32, and a liquid inlet pipe 42, respectively.
In the present embodiment, the biochemical tank 1 is referred to as an SBR tank 1.
Wherein, the SBR tank 1 is used for biochemical treatment of papermaking wastewater.
Specifically, the sewage enters the SBR tank 1 after being cooled by the cooling tower, the processes of water inlet, aeration reaction, sedimentation, drainage, sludge discharge and the like are completed in the SBR tank 1, and most organic matters in the sewage are decomposed into CO under the action of various microorganisms such as facultative, aerobic, anaerobic and the like in the SBR tank 12And water, the remaining organic matter also serving to complete the microbial proliferation itself.
Wherein, the liquid storage barrel 2 is used for storing biological antidote, one end of the liquid inlet pipeline 22 is inserted into the SBR tank 1, and the other end is inserted into the liquid storage barrel 2; a flow pump 21 is connected to the inlet pipe 22 for introducing the bioremediation agent into the SBR tank 1 during the intake phase.
Wherein, the liquid storage barrel 3 is used for storing the mixed liquid of the synergistic microbial inoculum and the biological synergistic nutrient, one end of the liquid inlet pipeline 32 is inserted into the SBR tank 1, and the other end is inserted into the liquid storage barrel 3; the liquid inlet pipe 32 is connected with a flow pump 31 for guiding the mixed liquid of the synergistic microbial inoculum and the biological synergistic nutrient into the SBR tank 1 in the aeration period.
Further, a fan (not shown) is arranged in the liquid storage barrel 3 and used for aerating the mixed liquid and flushing oxygen.
Wherein, the liquid storage barrel 4 is used for storing a biological growth promoting agent, one end of the liquid inlet pipeline 42 is inserted into the SBR tank 1, and the other end is inserted into the liquid storage barrel 4; a flow pump 41 is connected to the liquid inlet pipe 42 for introducing the bio-stimulant into the SBR tank 1 during the aeration period.
Different from the prior art, the biochemical treatment device is provided with liquid storage barrels which are used for storing mixed liquid of biological antidotes, synergistic agents and biological synergistic nutrients and biological growth promoters respectively around a biochemical pool, and different agents are introduced into the biochemical pool through a liquid inlet pipeline and a flow pump, so that microorganisms which have degradation capability on organic pollutants in the biochemical pool and necessary nutrition for the growth of the microorganisms can be supplemented, the biochemical performance of the microorganisms is optimized, the removal capability of the microorganisms on the organic pollutants in wastewater is improved, and the biochemical treatment effect of the biochemical pool is improved; simultaneously, the liquid storage bucket that this application added, inlet liquid pipeline and equipment prices such as flow pump are lower, and set up simply, easily operation, convenient extensive use.
The following non-limiting examples are provided to facilitate an understanding of the embodiments of the present application and are set forth in the detailed description to provide further explanation of the embodiments of the present application.
Example 1
When the dissolubility COD in the sewage is about 730mg/L (low load), the sewage enters an SBR pool after physicochemical treatment, and a biological antidote is added into the SBR pool in the water inlet period, wherein the dosage of the biological antidote is 0.25-0.5 mg/L; after water is fed, adding a mixed solution of a synergistic microbial inoculum and a biological synergistic nutrient into the SBR pool in an aeration period, wherein the addition amount of the synergistic microbial inoculum is 0.2-0.3 mg/L, and the addition amount of the biological synergistic nutrient is 0.4-0.7 mg/L; adding a mixed solution of a synergistic microbial agent and a biological synergistic nutrient into the SBR pool, and simultaneously adding a biological growth promoter, wherein the addition amount of the biological growth promoter is 0.2-0.3 mg/L.
When the dissolubility COD in the sewage is about 730mg/L (low load), the sewage enters the SBR tank after physical and chemical treatment, and any biological synergist is not added into the SBR tank in the biochemical treatment stage.
Example 2
When the dissolubility COD in the sewage is about 1200mg/L (high load), the sewage enters an SBR pool after physicochemical treatment, and a biological antidote is added into the SBR pool in the water inlet period, wherein the dosage of the biological antidote is 0.25-0.5 mg/L; after water is fed, adding a mixed solution of a synergistic microbial inoculum and a biological synergistic nutrient into the SBR pool in an aeration period, wherein the addition amount of the synergistic microbial inoculum is 0.2-0.3 mg/L, and the addition amount of the biological synergistic nutrient is 0.4-0.7 mg/L; adding a mixed solution of a synergistic microbial agent and a biological synergistic nutrient into the SBR pool, and simultaneously adding a biological growth promoter, wherein the addition amount of the biological growth promoter is 0.2-0.3 mg/L.
When the dissolubility COD in the sewage is about 1200mg/L (high load), the sewage enters the SBR pool after physical and chemical treatment, and any biological synergist is not added into the SBR pool in the biochemical treatment stage.
For examples 1 and 2 and blank control groups 1 and 2, the COD values of the influent water of the SBR tank (i.e., the COD value of the effluent water of the primary sedimentation tank) and the COD value of the effluent water of the SBR tank were recorded, and the average unit consumption of the water purifying agent in the subsequent advanced treatment process was recorded, and the results are shown in table 1:
TABLE 1
The reduction amount (COD removal rate) of the SBR pool effluent COD value and the SBR pool influent COD value is calculated according to the recorded results in the table 1, and the improvement values of the indexes of the examples 1 and 2 relative to the blank control groups 1 and 2 are respectively shown in the table 2:
TABLE 2
Note: the delta values are the difference between the indexes of the examples 1 and 2 and the blank control groups 1 and 2 respectively.
As can be seen from the above table, under the condition of ensuring the quality of the produced effluent, after various biological synergists are added into the SBR tank in the biochemical treatment stage, when the water quality COD is at low load, the effluent COD of the SBR tank can be controlled to be below 140mg/L and is reduced by 9mg/L compared with the effluent COD of the SBR tank of a blank control group; when the COD of the water quality is in a high load, the COD of the effluent of the SBR pool can be controlled to be below 160mg/L, and is reduced by 11mg/L compared with the COD of the effluent of the SBR pool of a blank control group. Furthermore, after various biological synergists are added into the SBR pool in the biochemical treatment stage, when the water quality COD is at low load, the unit consumption of the water purifying agent in the subsequent deepening process is reduced by 27.6 percent; when the water quality COD is in high load, the unit consumption of the water purifying agent in the subsequent deepening process is reduced by 3.4 percent.
In actual production, after having added multiple biological synergist in the SBR pond, SBR pond goes out water COD value and reduces, when guaranteeing air supporting pond play water COD at the management and control scope, can suitably reduce the quantity of water purifying agent, through promoting the biochemical treatment effect in SBR pond promptly, can effectively reduce the quantity of water purifying agent in the follow-up advanced treatment process, guarantee stable production under the circumstances that does not increase chemical cost, thereby solved traditional single control method, the problem that production adjustment space is limited and chemical cost is violent high, can regard as an emergent technological method when sewage overload operation.
Referring to fig. 3, fig. 3 is a schematic diagram showing the change trend of the unit consumption of water purifying agent, the influent COD of SBR tank, and the effluent COD of SBR tank in examples 1 and 2 and blank control groups 1 and 2 of the present application.
As shown in FIG. 3, after various biological synergists are added into the SBR tank in the biochemical treatment stage, the COD value of the effluent of the SBR tank is slightly lower than that of the effluent of the SBR tank without any biological synergists, and the unit consumption of the water purifying agent is obviously reduced. Furthermore, when the water quality COD is in a low load state, the unit consumption of the water purifying agent is reduced more remarkably.
In actual production, the inventor of the application finds that after a sewage plant of the factory adds a plurality of biological synergists into an SBR pool in a biochemical treatment stage, the adding cost of a biological antidote, a synergistic microbial inoculum, a biological synergistic nutrient and a biological growth promoter is about 146 ten thousand yuan/year, the cost of a water purifying agent in a subsequent advanced treatment process is reduced by about 218 ten thousand yuan/year, the annual benefit of comprehensive chemical medicine reduction is estimated to be about 72 ten thousand yuan/year, and the wastewater treatment cost is greatly reduced.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A biochemical treatment method of papermaking wastewater is characterized by comprising the following steps:
adding a biological antidote to the biochemical pond in the water inlet period;
after water is fed, adding mixed liquid of a synergistic microbial inoculum and a biological synergistic nutrient into the biochemical pool in an aeration period, and starting a biochemical treatment system;
and adding a bio-stimulant into the biochemical pool after the biochemical treatment system is started to supplement nutrient substances for the biochemical treatment system.
2. The biochemical treatment method for papermaking wastewater according to claim 1, further comprising, before the step of adding the mixed solution of synergistic microbial inoculum and biological synergistic nutrient to the biochemical pond during the aeration period:
and activating the mixed solution of the synergistic microbial inoculum and the biological synergistic nutrient by a fan.
3. The biochemical treatment method of papermaking wastewater according to claim 2, further comprising, before the step of activating the mixed solution of the synergistic agent and the biological synergistic nutrient by the blower:
and preparing the mixed solution of the synergistic microbial inoculum and the biological synergistic nutrient at least 24 hours in advance.
4. The biochemical treatment method for paper-making wastewater according to claim 1, wherein the aeration period is 3 hours.
5. The biochemical treatment method of paper-making wastewater according to claim 1, wherein the biological antidote comprises small molecule organic acid, vitamin complex, trace elements and urea; the addition amount of the biological antidote is 0.25-0.5 mg/L.
6. The biochemical treatment method of papermaking wastewater according to claim 1, characterized in that the synergistic microbial inoculum is a natural product, and the natural product comprises microbial cells, bran particles, spores, enzymes; the easily-usable addition amount is 0.2-0.3 mg/L.
7. The biochemical treatment method of papermaking wastewater according to claim 6, wherein the bacterial strain is used for degrading aromatic compounds, aliphatic compounds and complex carbon chains.
8. The biochemical treatment method of paper-making wastewater according to claim 1, wherein the biological synergistic nutrient comprises biological enzymes, glucose and urea; the addition amount of the biological synergistic nutrient is 0.4-0.7 mg/L.
9. The biochemical treatment method of paper-making wastewater according to claim 1, wherein the bio-stimulant comprises vitamin complex, glucose and urea; the addition amount of the bio-stimulant is 0.2-0.3 mg/L.
10. A biochemical treatment device for papermaking wastewater, characterized in that the device comprises:
the biochemical tank is used for biochemically treating the papermaking wastewater;
the liquid storage barrel is used for storing a biological antidote, a mixed liquid of a synergistic microbial inoculum and a biological synergistic nutrient and a biological growth promoter respectively;
one end of the liquid inlet pipeline is inserted into the biochemical pool, and the other end of the liquid inlet pipeline is inserted into the liquid storage barrel;
wherein, be connected with the flow pump on the inlet channel for with different medicaments leading-in the biochemical pond.
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| WO2011116027A2 (en) * | 2010-03-16 | 2011-09-22 | Avatar Energy | Method and apparatus for the treatment of waste effluent |
| CN102515364A (en) * | 2011-11-03 | 2012-06-27 | 袁磊 | Broad-spectrum bio-energizer for industrial wastewater treatment and preparation method thereof |
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