CN111977899B - Treatment system and method for high-concentration nonbiodegradable organic wastewater - Google Patents
Treatment system and method for high-concentration nonbiodegradable organic wastewater Download PDFInfo
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- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention discloses a treatment system and a method for high-concentration nonbiodegradable organic wastewater, wherein the treatment system for high-concentration nonbiodegradable organic wastewater comprises a first electrolytic tank and a second electrolytic tank which are sequentially communicated along the flowing direction of the organic wastewater, wherein a negative plate and an aeration device are arranged in the first electrolytic tank, and the negative plate is an activated carbon fiber electrode plate; an anode plate is arranged in the second electrolytic tank, the anode plate is an activated carbon fiber electrode plate, the cathode plate and the anode plate are both communicated with the same direct current power supply, and the second electrolytic tank is used for adding activated sludge microorganisms. The technical scheme provided by the invention aims to solve the problem that the existing organic wastewater treatment method has poor treatment effect on high-concentration organic wastewater difficult to biodegrade.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment system and a treatment method for high-concentration organic wastewater difficult to biodegrade.
Background
At present, the method for treating organic wastewater at home and abroad mainly comprises three modes, namely a chemical method, a biological method and a physical method. The physical method is mostly used as pretreatment, and is often combined with a plurality of other treatment processes, so that the main treatment effect is difficult to play, the chemical method is easy to cause secondary pollution, the equipment cost is high, and the reaction conditions are harsh. For this reason, biodegradation is often used for organic wastewater treatment.
Because industrial wastewater is mostly artificially synthesized macromolecular substances, most of the industrial wastewater is not easily biodegraded, has the characteristics of high concentration and difficult biodegradation, and has biotoxicity, the macromolecular substances are not easily removed by the currently common biological treatment process, the content of the macromolecular substances is not easily reduced gradually by the natural self-cleaning effect when the macromolecular substances are discharged into the natural environment, the macromolecular substances can be continuously accumulated in natural media such as water, soil and the like, the original balance of an ecological system is broken, and the ecological system is greatly threatened for the environment depending on the existence of human beings, and the macromolecular substances can enter organisms through a food chain, are gradually enriched and finally enter the human body to harm the health.
Disclosure of Invention
The invention mainly aims to provide a treatment system and a treatment method for high-concentration organic wastewater difficult to biodegrade, and aims to solve the problem that the conventional organic wastewater treatment method has poor treatment effect on the high-concentration organic wastewater difficult to biodegrade.
In order to achieve the above object, the present invention provides a treatment system for high-concentration nonbiodegradable organic wastewater, comprising a first electrolytic tank and a second electrolytic tank which are sequentially communicated along a flow direction of the organic wastewater, wherein:
a negative plate and an aeration device are arranged in the first electrolytic tank, and the negative plate is an activated carbon fiber electrode plate;
an anode plate is arranged in the second electrolytic tank, the anode plate is an activated carbon fiber electrode plate, the cathode plate and the anode plate are both communicated with the same direct current power supply, and the second electrolytic tank is used for adding activated sludge microorganisms.
Optionally, the electrolytic cell further comprises a sedimentation tank, wherein the sedimentation tank is provided with a water outlet and is communicated with the second electrolytic cell.
Optionally, the electrolytic bath further comprises a water outlet return pipe and a treatment water outlet pipe, wherein the water outlet is communicated with the first electrolytic bath through the water outlet return pipe, and the water outlet is communicated with the treatment water outlet pipe.
Optionally, a sludge outlet is arranged at the bottom of the sedimentation tank;
the treatment system for the high-concentration organic wastewater difficult to biodegrade further comprises a sludge return pipe and a sludge discharge pipe, wherein the sludge outlet is communicated with the second electrolytic tank through the sludge return pipe, and the sludge outlet is communicated with the sludge discharge pipe.
Optionally, the cathode plate is provided with a plurality of cathode plates, and the plurality of cathode plates are arranged side by side at intervals; and/or the presence of a gas in the gas,
the anode plates are arranged side by side and are arranged at intervals; and/or the presence of a gas in the gas,
the aeration device comprises a plurality of aeration heads, and the plurality of aeration heads are arranged below the cathode plate.
Furthermore, the present invention also proposes a treatment method for high-concentration nonbiodegradable organic wastewater, performed using the treatment system for high-concentration nonbiodegradable organic wastewater as described above, comprising the steps of:
conveying the organic wastewater to a first electrolytic tank, and carrying out electrolysis and electrocatalysis co-treatment on the organic wastewater under the condition of intermittent aeration to obtain first treated water;
and conveying the first treated water to a second electrolytic tank, adding activated sludge microorganisms, and carrying out electrolysis and biodegradation coupling reaction to obtain second treated water.
Optionally, after the step of delivering the first treated water to a second electrolytic tank, and adding activated sludge microorganisms to perform electrolysis and biodegradation coupling reaction to obtain second treated water, the method further comprises:
settling the second treated water to obtain settled sludge and treated effluent;
shunting the treated effluent, and conveying the shunted part of the treated effluent into the first electrolytic tank;
and shunting the precipitated sludge, and conveying the shunted part of the precipitated sludge to the second electrolytic tank.
Optionally, in the step of feeding the organic wastewater to a first electrolytic tank, subjecting the organic wastewater to electrolysis and electrocatalytic co-treatment under intermittent aeration conditions to obtain first treated water,
the hydraulic retention time in the first electrolytic tank is 40-100 min;
the intermittent aeration comprises at least one aeration period, each aeration period comprises an aeration period and an aeration stopping period, the time of the aeration period is 20-40 min in each aeration period, the ratio of the flow rate of the introduced compressed air to the flow rate of the organic wastewater in the aeration period is 1-3: 1, and the time of the aeration stopping period is 20-40 min;
the parameters of the negative plate are that the current density is 5-20 mA/cm 2 And the distance between the polar plates is 2-4 cm.
Optionally, in the step of delivering the first treated water to a second electrolytic tank, and adding activated sludge microorganisms to perform electrolysis and biodegradation coupling reaction to obtain second treated water,
the hydraulic retention time in the second electrolytic tank is 6-15 h;
the sludge load in the second electrolytic tank is 0.15-0.35 kgCOD/kgMLSS.d;
the parameters of the anode plate are that the current density is 5-20 mA/cm 2 And the distance between the polar plates is 2-4 cm.
Optionally, the reflux ratio of the treated water is 100-200%; and/or the presence of a gas in the gas,
the reflux ratio of the precipitated sludge is 50-100%.
The treatment system for high-concentration nonbiodegradable organic wastewater comprises a first electrolytic tank and a second electrolytic tank, wherein an aeration device and an activated carbon fiber cathode plate are arranged in the first electrolytic tank, and an anoxic environment and an aerobic environment are alternately formed by intermittent aeration, so that the organic wastewater is electrolyzed and electrocatalyzed in the first electrolytic tank to generate nascent state [ H ] with reducing capacity]And a series of strongly oxidizing intermediates such as [ O ] 2 2- ]、[H 2 O 2 ]、[·OH]The method realizes the pretreatment of the organic wastewater, and improves the biodegradability of the first treated water; the activated carbon fiber anode plate is arranged in the second electrolytic tank, so that the anode plate electrolyzes water to generate O 2 So as to form an aerobic environment in the tank, promote the growth of activated sludge microorganisms, improve the biodegradation efficiency, promote the biological activity reaction of enzyme through the stimulation effect of an electric field on the microorganisms, and further strengthen the biodegradation effect. In addition, the treatment system has simple structure, easy manufacture, low investment and operation cost and no secondary pollution, and is suitable for industrial popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a treatment system for high-concentration nonbiodegradable organic wastewater provided by the invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name(s) |
| 100 | Processing system | 5 | Sedimentation tank |
| 1 | |
6 | Treating the |
| 2 | First electrolytic tank | 7 | |
| 21 | |
81 | Water |
| 220 | |
82 | |
| 221 | |
91 | Sludge reflux pump |
| 3 | Second |
92 | Water |
| 31 | |
93 | Valve gate |
| 4 | Communicating |
10 | Direct current power supply |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
At present, the method for treating organic wastewater at home and abroad mainly comprises three modes, namely a chemical method, a biological method and a physical method. The physical method is mostly used as pretreatment, and is often combined with a plurality of other treatment processes, so that the main treatment effect is difficult to play, the chemical method easily causes secondary pollution, the equipment cost is high, and the reaction conditions are harsh. Therefore, biodegradation is often used for organic wastewater treatment.
Because industrial wastewater is mostly artificially synthesized macromolecular substances, most of the industrial wastewater is not easily biodegraded, has the characteristics of high concentration and difficult biodegradation, and has biotoxicity, the macromolecular substances are not easily removed by the currently common biological treatment process, the content of the macromolecular substances is not easily reduced gradually by the natural self-purification effect when the macromolecular substances are discharged into the natural environment, the macromolecular substances can be continuously accumulated in natural media such as water, soil and the like, the original balance of an ecological system is broken, the environment in which human beings depend for survival is greatly threatened, and the macromolecular substances can enter organisms through a food chain, are gradually enriched and finally enter human bodies to harm the health.
In view of the above, the present invention provides a treatment system 100 for high concentration organic wastewater difficult to biodegrade, and fig. 1 is an embodiment of the treatment system 100 for high concentration organic wastewater difficult to biodegrade according to the present invention.
Referring to fig. 1, a treatment system 100 for high-concentration nonbiodegradable organic wastewater comprises a first electrolytic tank 2 and a second electrolytic tank 3 sequentially communicated along the flow direction of the organic wastewater, wherein a cathode plate 21 and an aeration device are arranged in the first electrolytic tank 2, and the cathode plate 21 is an activated carbon fiber electrode plate; an anode plate 31 is arranged in the second electrolytic tank 3, the anode plate 31 is an activated carbon fiber electrode plate, the cathode plate 21 and the anode plate 31 are both communicated with the same power supply 10, and the second electrolytic tank 3 is used for adding activated sludge microorganisms.
The activated carbon fiber electrode plate has the characteristics of being porous and high in specific surface area, has a conductive effect, can electrolyze organic wastewater, can enrich pollutants on the surface of the electrode after adsorption, and then carries out electrocatalysis treatment, so that the electrolysis and electrocatalysis synergistic effect is achieved, the electrolysis effect is improved, and the reaction energy consumption is reduced.
Wherein, first electrolysis trough 2 and inlet tube 1 intercommunication, the raw water, high concentration difficult biodegradable organic waste water gets into first electrolysis trough 2 through inlet tube 1 promptly. The aeration device is arranged in the first electrolytic tank 2, and the aeration device is controlled to intermittently introduce air into the first electrolytic tank 2, so that an anoxic environment and an aerobic environment are alternately formed in the first electrolytic tank 2. When the aeration device stops aerating into the first electrolytic tank 2, an anoxic environment is formed in the tank, and the hydrated H in the wastewater + At the cathode plateIs reduced to H at 21 2 ，H 2 Under the catalytic action of activated carbon fiber, nascent state [ H ] with reducing power can be generated]Reducing some oxidizing groups in the organic matters difficult to biodegrade, thereby improving the biodegradability of the organic matters difficult to biodegrade; when aeration is carried out, an aerobic environment is formed in the tank, and oxygen in the water are dissolved due to the existence of dissolved oxygen in the water 2 Specific hydration of molecules H + Is more easily reduced at the cathode plate 21, and the dissolved oxygen in the water generates strong oxidizing intermediate products such as [ O ] under the catalytic action of the activated carbon fiber 2 2- ]、[H 2 O 2 ]、[·OH]And the intermediate products can open and break the ring of the macromolecular organic matters which are difficult to biodegrade in water to change the macromolecular organic matters into organic matters which are easy to biodegrade, thereby being beneficial to the subsequent biological treatment. Meanwhile, the intermediate products can directly oxidize and decompose part of organic pollutants in the wastewater into CO 2 And H 2 And O is removed. In addition, the aeration also plays a role of stirring, accelerates the mass transfer in the first electrolytic tank 2, eliminates concentration polarization in the electrolytic reaction and accelerates the reaction speed.
Wherein, an activated carbon fiber anode plate 31 is arranged in the second electrolytic tank 3, and after being electrified, the anode plate 31 electrolyzes water to generate O 2 Thereby forming an aerobic environment in the tank, promoting the growth of the activated sludge microorganisms, providing an electron acceptor for the oxidative decomposition of organic pollutants by the activated sludge microorganisms and improving the biodegradation efficiency. Meanwhile, the second electrolytic tank 3 is also internally provided with electrochemical oxidation for removing organic pollutants. In addition, the microorganism is in a specific electric field to generate electrocatalysis, so that the enzyme activity is activated or enhanced, the biological activity reaction of the enzyme is promoted, and the biodegradation effect is further enhanced.
In addition, the treatment system 100 related to the invention has simple structure, easy manufacture, low investment and operation cost and no secondary pollution, and is suitable for industrial popularization.
In the first electrolytic bath 2, the number of the cathode plates 21 may be one or more. As a preferred embodiment, in the embodiment, a plurality of cathode plates 21 are arranged, the cathode plates 21 are arranged at intervals, and the distance between two adjacent cathode plates 21 is 2-4 cm; in the second electrolytic tank 3, the number of the anode plates 31 may be one or more. In the preferred embodiment, a plurality of anode plates 31 are provided, the anode plates 31 are spaced apart from each other, and the distance between two adjacent anode plates 31 is 2-4 cm.
In addition, in the first electrolytic tank 2, the aeration device comprises a compressed air pipe 221 and a blower (not shown in the figure), one end of the compressed air pipe 221 is connected with the blower, the other end of the compressed air pipe 221 extends into the first electrolytic tank 2 and is communicated with the aeration head 220, and air output by the blower enters the aeration head 220 through the compressed air pipe 221 and then is sprayed out to generate an aeration effect. Preferably, the number of the aeration heads 220 is plural, and the plural aeration heads 220 are disposed below the cathode plate 21, so that an aerobic environment can be rapidly created, and an effect of violent waste water turnover can be realized.
In addition, in the present embodiment, the cathode plate 21 and the anode plate 31 are connected to the negative electrode and the positive electrode of the dc power supply 10, respectively.
Further, referring to fig. 1, the treatment system 100 of the embodiment further includes a sedimentation tank 5, the sedimentation tank 5 is communicated with the second electrolytic tank 3 through a communicating pipe 4, the sedimentation tank 5 is provided with a water outlet, the second treated water after biodegradation is conveyed into the sedimentation tank 5 and then is settled therein, solid-liquid separation is realized, and the supernatant is discharged from the water outlet.
In an embodiment of the present invention, the treatment system 100 further comprises a treatment water outlet pipe 6 and a water outlet return pipe 81. The water outlet is communicated with the first electrolytic tank 2 through the water outlet return pipe 81, so that the treated water discharged from the water outlet can be partially shunted and flows back to the first electrolytic tank 2, and the acid-base adjustment is carried out on the organic wastewater in the first electrolytic tank 2, so that the pH value of the wastewater in the first electrolytic tank 2 is more favorable for anoxic/aerobic electrolytic reaction, and meanwhile, the pH value of the treated water is close to neutral, and the water outlet requirement is met. Moreover, the concentration of the organic pollutants in the water can be diluted through the effluent backflow, the reaction load of the first electrolytic tank 2 and the second electrolytic tank 3 is reduced, and the electrolysis and biochemical reaction efficiency is improved.
In another embodiment of the present invention, the treatment system 100 further comprises a sludge return pipe 82 and a sludge discharge pipe 7, wherein the sludge outlet is communicated with the second electrolytic tank 3 through the sludge return pipe 82, and the sludge outlet is also communicated with the sludge discharge pipe 7, so that the sludge discharged from the sludge outlet is divided, and a part of the sludge returns to the second electrolytic tank 3 through the sludge return pipe 82, so as to maintain the number of activated sludge microorganisms in the second electrolytic tank 3, and the rest part of the sludge is discharged as excess sludge for further treatment.
It should be noted that, in order to guide the flow direction of the effluent and the sludge, an effluent reflux pump 92 may be disposed on the effluent reflux pipe 81, and a sludge reflux pump 91 may be disposed on the sludge reflux pipe 82; in order to control the amount of returned effluent and the amount of returned sludge, valves 93 may be provided in the effluent return pipe 81 and the sludge return pipe 82.
Further, based on the above-described examples, examples of the treatment method for high-concentration nonbiodegradable organic wastewater of the present invention are presented, and the treatment method for high-concentration nonbiodegradable organic wastewater of the present example is performed using the treatment system 100 described above.
In this embodiment, the treatment method for high-concentration nonbiodegradable organic wastewater comprises the following steps:
and step S10, delivering the organic wastewater to the first electrolytic tank 2, and carrying out electrolysis and electrocatalysis co-treatment on the organic wastewater under the condition of intermittent aeration to obtain first treated water.
And step S20, conveying the first treated water to a second electrolytic tank 3, and adding activated sludge microorganisms to perform electrolysis and biodegradation coupling reaction to obtain second treated water.
According to the technical scheme, the organic wastewater is subjected to electrolysis and electrocatalysis synergistic pretreatment to improve the biodegradability of the first treated water, and then the first treated water is sent into the second electrolytic tank 3 to improve the biodegradation efficiency and the degradation effect through electrolysis and biodegradation coupling reaction.
Wherein, when step S10 is performed, the intermittent aeration may include one or more aeration periods, and each aeration period includes an aeration period and a stop aeration period, so that an aerobic environment and an anoxic environment may be alternately realized, thereby allowing the oxidation reaction and the reduction reaction to be alternately performed, and improving the wastewater treatment efficiency. Further, in the embodiment, in each aeration period, the time of the aeration period is 20-40 min, and the time of the aeration stopping period is 20-40 min, so that the oxidation reaction process and the reduction reaction process in the reaction system can be balanced, and the wastewater treatment effect is improved. In addition, in order to further optimize the treatment effect of the method, in the embodiment, when the aeration stage is performed, the gas-water ratio (the ratio of the flow of the compressed air introduced into the aeration stage to the flow of the organic wastewater) is controlled to be 1-3: 1, so that the electrolysis and electrocatalysis synergistic effect and the energy consumption are balanced, and the benefit is maximized.
In addition, in the step S10, the hydraulic retention time of the organic wastewater in the first electrolytic tank 2 is 40-100 min, and a part of the organic components difficult to be biodegraded can be oxidized and reduced within the time range, so as to improve the biodegradability of the organic wastewater.
When the step S20 is carried out, the hydraulic retention time of the first treated water in the second electrolytic tank 3 is 6-15 h, and the organic pollutants in the first treated water can be efficiently degraded under the synergistic effect of electrolysis and microorganisms within the time range, so that the degradation efficiency and the quality of the treated water are improved. In this example, the sludge load in the second electrolytic tank 3 was 0.15 to 0.35kgCOD/kgMLSS d.
In addition, during electrolysis, parameters of the cathode plate 21 and the anode plate 31 can be controlled to regulate and control the treatment effect on the wastewater, and specifically, the parameters of the cathode plate 21 are that the current density is 5-20 mA/cm 2 The distance between the polar plates is 2-4 cm; the parameters of the anode plate 31 are that the current density is 5-20 mA/cm 2 And the distance between the polar plates is 2-4 cm.
As a preferred embodiment of the present invention, in this embodiment, after step S20, the following steps are further included:
step S30, carrying out sedimentation treatment on the second treated water to obtain precipitated sludge and treated effluent;
step S40 of dividing the treated effluent and sending the divided part of the treated effluent into the first electrolytic bath 2;
step S50, diverting the precipitated sludge, and conveying the diverted part of the precipitated sludge into the second electrolytic tank 3.
The embodiment carries out sedimentation treatment on the second treated water, realizes solid-liquid separation, further improves the quality of treated effluent, then shunts the treated effluent, and reflows a part of the treated effluent to the first electrolytic tank 2, so that the pH value of the wastewater in the first electrolytic tank 2 is more favorable for anoxic/aerobic electrolytic reaction, improves the wastewater treatment effect, and simultaneously, dilutes the concentration of organic pollutants in the influent through treated effluent backflow, reduces the reaction load of the first electrolytic tank 2 and the second electrolytic tank 3, and improves the efficiency of electrolysis and biochemical reaction. The other part of the treated effluent is discharged or reused after further treatment.
In order to optimize the reflux effect, the reflux ratio of the treated effluent in the embodiment is preferably 100 to 200%.
Meanwhile, the embodiment shunts the precipitated sludge, guides a part of the precipitated sludge to flow back to the second electrolytic tank 3, so as to maintain the number of the activated sludge microorganisms in the second electrolytic tank 3, ensures that the degradation reaction in the second electrolytic tank 3 is smoothly carried out, avoids the active sludge microorganisms from being thrown again, saves the cost, and discharges the other part of the precipitated sludge as residual sludge for additional treatment. Further, in this embodiment, the reflux ratio of the precipitated sludge is preferably 50% to 100%, so that the number of activated sludge microorganisms can be maintained within a reasonable range.
The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.
Example 1
The following example was conducted using a treatment system 100 for high-concentration nonbiodegradable organic wastewater as shown in FIG. 1 and artificially simulated phenolic-containing nonbiodegradable organic wastewater. The organic wastewater contains organic matters which are difficult to biodegrade, such as phenol, chlorophenol, aminophenol and the like, the CODcr content is 2400mg/L, the BOD is 620mg/L, and the BOD/CODcr is 0.26, so the biodegradability is poor.
The process parameters are set as follows:
in the first electrolytic tank 2: the distance between the two cathode plates 21 is 3 cm; hydraulic retention time is 80 min; during periodic aeration, the air-water ratio of the compressed air introduced into the aeration stage is 1.5:1, and in one period, the aeration time and the aeration stop time are both 30 min.
In the second electrolytic tank 3: the distance between the two anode plates 31 is 3 cm; the hydraulic retention time is 10 h; the sludge load was 0.22kg CODcr/kg MLSS. d.
The current density is 12mA/cm 2 (ii) a The sludge reflux ratio is 60 percent, and the effluent reflux ratio is 150 percent.
The first treated water was sampled at the outlet of the first electrolytic tank 2, the treated effluent was sampled at the treated outlet pipe 6, the CODcr content and BOD content of the first treated water and the CODcr content of the treated effluent were respectively detected using a COD analyzer and a BOD detector, and the BOD/CODcr value of the first treated water was calculated, and the results were recorded in table 1.
Example 2
The following example was conducted using a treatment system 100 for high-concentration nonbiodegradable organic wastewater as shown in FIG. 1 and artificially simulated phenolic-containing nonbiodegradable organic wastewater. The organic wastewater contains phenol, chlorophenol, aminophenol and other organic matters which are difficult to biodegrade, the CODcr content is 2060mg/L, the BOD is 580mg/L, and the BOD/CODcr is 0.28, and the biodegradability is poor.
The process parameters are set as follows:
in the first electrolytic tank 2: the distance between the two cathode plates 21 is 2.8 cm; hydraulic retention time is 40 min; during periodic aeration, the air-water ratio of the compressed air introduced into the aeration stage is 1:1, and in one period, the aeration time and the aeration stop time are both 20 min.
In the second electrolytic tank 3: the distance between the two anode plates 31 is 2.8 cm; the hydraulic retention time is 6 h; the sludge load was 0.15kg CODcr/kg MLSS. d.
The current density is 16mA/cm 2 (ii) a The sludge reflux ratio is 50 percent, and the effluent reflux ratio is 100 percent.
The first treated water was sampled at the outlet of the first electrolytic tank 2, the treated effluent was sampled at the treated water outlet pipe 6, the CODcr content and BOD content of the first treated water and the CODcr content of the treated effluent were respectively detected using a COD analyzer and a BOD detector, and the BOD/CODcr value of the first treated water was calculated and the results were recorded in table 1.
Example 3
The following example was conducted using a treatment system 100 for high-concentration nonbiodegradable organic wastewater as shown in FIG. 1 and artificially simulated phenolic-containing nonbiodegradable organic wastewater. The organic wastewater contains organic matters which are difficult to biodegrade, such as phenol, chlorophenol, aminophenol and the like, the CODcr content is 3300mg/L, the BOD is 480mg/L, the BOD/CODcr is 0.15, and the biodegradability is poor.
The process parameters are set as follows:
in the first electrolytic tank 2: the distance between the two cathode plates 21 is 3.3 cm; the hydraulic retention time is 100 min; during periodic aeration, the air-water ratio of the compressed air introduced into the aeration stage is 3:1, and in one period, the aeration time and the aeration stop time are both 40 min.
In the second electrolytic tank 3: the distance between the two anode plates 31 is 3.3 cm; the hydraulic retention time is 15 h; the sludge load was 0.35kg CODcr/kg MLSS. d.
The current density is 20mA/cm 2 (ii) a The sludge reflux ratio is 100 percent, and the effluent reflux ratio is 200 percent.
The first treated water was sampled at the outlet of the first electrolytic tank 2, the treated effluent was sampled at the treated water outlet pipe 6, the CODcr content and BOD content of the first treated water and the CODcr content of the treated effluent were respectively detected using a COD analyzer and a BOD detector, and the BOD/CODcr value of the first treated water was calculated and the results were recorded in table 1.
TABLE 1 Water quality comparison before and after treatment
As can be seen from the above table, after the organic wastewater is treated by the methods of the embodiments, the CODcr removal rate of the first treated water reaches more than 44%, and the biochemical BOD/CODcr is more than or equal to 0.31, which can meet the requirements of the subsequent biochemical treatment; the CODcr removing rate of treated effluent is more than or equal to 92 percent. The invention is proved to have obvious treatment effect on the high-concentration organic wastewater difficult to biodegrade.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A treatment system for high-concentration nonbiodegradable organic wastewater, comprising a first electrolytic tank and a second electrolytic tank which are sequentially communicated along the flow direction of the organic wastewater, wherein:
a negative plate and an aeration device are arranged in the first electrolytic tank, and the negative plate is an activated carbon fiber electrode plate;
an anode plate is arranged in the second electrolytic tank, the anode plate is an activated carbon fiber electrode plate, the cathode plate and the anode plate are both communicated with the same direct current power supply, and the second electrolytic tank is used for adding activated sludge microorganisms.
2. The treatment system for high-concentration nonbiodegradable organic wastewater according to claim 1, further comprising a sedimentation tank provided with a water outlet, the sedimentation tank being communicated with the second electrolytic tank.
3. The treatment system for high-concentration nonbiodegradable organic wastewater according to claim 2, further comprising an effluent return pipe and a treatment outlet pipe, wherein the water outlet is communicated with the first electrolytic tank through the effluent return pipe, and the water outlet is communicated with the treatment outlet pipe.
4. The treatment system for high-concentration nonbiodegradable organic wastewater according to claim 3, wherein a sludge outlet is formed at the bottom of the sedimentation tank;
the treatment system for the high-concentration organic wastewater difficult to biodegrade further comprises a sludge return pipe and a sludge discharge pipe, wherein the sludge outlet is communicated with the second electrolytic tank through the sludge return pipe, and the sludge outlet is communicated with the sludge discharge pipe.
5. The treatment system for high-concentration nonbiodegradable organic wastewater according to claim 1, wherein a plurality of the cathode plates are provided, and the plurality of the cathode plates are arranged side by side and at intervals; and/or the presence of a gas in the gas,
the anode plates are arranged side by side and are arranged at intervals; and/or the presence of a gas in the atmosphere,
the aeration device comprises a plurality of aeration heads, and the plurality of aeration heads are arranged below the cathode plate.
6. A treatment method for high-concentration nonbiodegradable organic wastewater, characterized by being carried out using the treatment system for high-concentration nonbiodegradable organic wastewater according to any one of claims 1 to 5, the treatment method for high-concentration nonbiodegradable organic wastewater comprising the steps of:
conveying the organic wastewater to a first electrolytic tank, and carrying out electrolysis and electrocatalysis co-treatment on the organic wastewater under the condition of intermittent aeration to obtain first treated water;
and conveying the first treated water to a second electrolytic tank, adding activated sludge microorganisms, and carrying out electrolysis and biodegradation coupling reaction to obtain second treated water.
7. The method according to claim 6, further comprising, after the step of delivering the first treated water to a second electrolytic tank, and adding activated sludge microorganisms to perform electrolysis and biodegradation coupled reaction to obtain second treated water:
settling the second treated water to obtain settled sludge and treated effluent;
dividing the treated effluent, and conveying the divided part of the treated effluent into the first electrolytic tank;
and shunting the precipitated sludge, and conveying the shunted part of the precipitated sludge to the second electrolytic tank.
8. The method according to claim 6, wherein in the step of feeding the organic wastewater to the first electrolytic tank, subjecting the organic wastewater to a combined electrolysis and electrocatalysis treatment under intermittent aeration to obtain first treated water,
the hydraulic retention time in the first electrolytic tank is 40-100 min;
the intermittent aeration comprises at least one aeration period, each aeration period comprises an aeration period and an aeration stopping period, the time of the aeration period is 20-40 min in each aeration period, the ratio of the flow rate of the introduced compressed air to the flow rate of the organic wastewater in the aeration period is 1-3: 1, and the time of the aeration stopping period is 20-40 min;
the parameters of the negative plate are that the current density is 5-20 mA/cm 2 And the distance between the polar plates is 2-4 cm.
9. The method according to claim 6, wherein in the step of delivering the first treated water to a second electrolytic tank and adding activated sludge microorganisms to perform electrolysis and biodegradation coupled reaction to obtain second treated water,
the hydraulic retention time in the second electrolytic tank is 6-15 h;
the sludge load in the second electrolytic tank is 0.15-0.35 kgCOD/kgMLSS.d;
the parameters of the anode plate are that the current density is 5-20 mA/cm 2 And the distance between the polar plates is 2-4 cm.
10. The method for treating high-concentration nonbiodegradable organic wastewater according to claim 7, wherein the reflux ratio of the treated effluent is 100-200%; and/or the presence of a gas in the gas,
the reflux ratio of the precipitated sludge is 50-100%.
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| JP2009034625A (en) * | 2007-08-02 | 2009-02-19 | Mhi Environment Engineering Co Ltd | Wastewater treatment apparatus and method |
| CN102491516A (en) * | 2011-11-25 | 2012-06-13 | 天津工业大学 | Method for treating wastewater difficult to be biodegraded by electric microorganism and membrane filtration coupled technology |
| CN104261628A (en) * | 2014-10-09 | 2015-01-07 | 天津工业大学 | Method for treating degradation-resistant organic wastewater by membrane potential biological coupling process |
| CN105293639A (en) * | 2015-11-17 | 2016-02-03 | 天津大学 | Cathodic and anodic collaborative electrolysis treatment method of wastewater and device thereof |
| CN108423913A (en) * | 2018-04-11 | 2018-08-21 | 武汉轻工大学 | Low-temperature and low turbidity water treatment facilities and processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009034625A (en) * | 2007-08-02 | 2009-02-19 | Mhi Environment Engineering Co Ltd | Wastewater treatment apparatus and method |
| CN102491516A (en) * | 2011-11-25 | 2012-06-13 | 天津工业大学 | Method for treating wastewater difficult to be biodegraded by electric microorganism and membrane filtration coupled technology |
| CN104261628A (en) * | 2014-10-09 | 2015-01-07 | 天津工业大学 | Method for treating degradation-resistant organic wastewater by membrane potential biological coupling process |
| CN105293639A (en) * | 2015-11-17 | 2016-02-03 | 天津大学 | Cathodic and anodic collaborative electrolysis treatment method of wastewater and device thereof |
| CN108423913A (en) * | 2018-04-11 | 2018-08-21 | 武汉轻工大学 | Low-temperature and low turbidity water treatment facilities and processing method |
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