CN108726803B - Papermaking wastewater calcium control process for anaerobic tower - Google Patents
Papermaking wastewater calcium control process for anaerobic tower Download PDFInfo
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- CN108726803B CN108726803B CN201810603895.6A CN201810603895A CN108726803B CN 108726803 B CN108726803 B CN 108726803B CN 201810603895 A CN201810603895 A CN 201810603895A CN 108726803 B CN108726803 B CN 108726803B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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Abstract
The invention discloses a papermaking wastewater calcium control process for an anaerobic tower, which belongs to the technical field of papermaking wastewater treatment, and is technically characterized by comprising the following steps of S1: the papermaking wastewater treated by the hydrolysis biochemical pool flows into the guide pipe from the water outlet, and then dilute hydrochloric acid flows into the guide pipe through the first chemical adding pipe to adjust the pH value of the papermaking wastewater to 6-7; step S2, continuously adding an anaerobic calcification dispersing agent from the second chemical adding pipe into the pre-acidified papermaking wastewater, and controlling the temperature of the papermaking wastewater to be 35-40 ℃; step S3, discharging the paper-making wastewater treated in the step S2 into the bottom of an anaerobic tower through a conduit for wastewater treatment; and step S4, discharging the paper-making wastewater after wastewater treatment into an aeration tank from a pipeline above the anaerobic tower for aeration and calcification treatment. The invention reduces the calcification speed of calcium ions in the anaerobic tower and improves the capability of the anaerobic tower for treating papermaking wastewater.
Description
Technical Field
The invention belongs to the technical field of papermaking wastewater treatment, and particularly relates to a papermaking wastewater calcium control process for an anaerobic tower.
Background
China is one of the earliest countries for producing paper in the world, and is also the world of paper making at present, the paper making yield accounts for the first place in the world, the paper making waste material resources are also quite rich, and the treatment of the paper making waste water is also paid attention to along with the continuous increase of the paper making consumption.
Wherein, the paper making process can be carried out with processes of pulping, pulp washing, bleaching, paper making and the like, the prior paper making mostly adopts an alkali pulping process, and the paper making wastewater generated by the process not only contains a large amount of NaOH and Na2S and Na2SO4And also contains a large amount of CaCO3And a small amount of MgCO3. At the same time, a large amount of CaCO3The anaerobic bacteria are coated in the anaerobic sludge, so that the anaerobic sludge is died in advance and is not killedOnly wastes resources and increases the cost, and also influences the processing capacity of the anaerobic tower. Therefore, a new technical solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a papermaking wastewater calcium control process for an anaerobic tower, which reduces the calcification speed of calcium ions in the anaerobic tower and improves the capability of the anaerobic tower for treating papermaking wastewater.
In order to achieve the purpose, the invention provides the following technical scheme: a papermaking wastewater calcium control process for an anaerobic tower comprises the following operation steps,
step S1, pre-acidification: the papermaking wastewater treated by the hydrolysis biochemical pool flows into the guide pipe from the water outlet, and then dilute hydrochloric acid flows into the guide pipe through the first chemical adding pipe to adjust the pH value of the papermaking wastewater to 6-7;
step S2, continuously adding an anaerobic calcification dispersing agent from the second chemical adding pipe into the pre-acidified papermaking wastewater, and controlling the temperature of the papermaking wastewater to be 35-40 ℃;
step S3, discharging the paper-making wastewater treated in the step S2 into the bottom of an anaerobic tower through a conduit for wastewater treatment;
and step S4, discharging the paper-making wastewater after wastewater treatment into an aeration tank from a pipeline above the anaerobic tower for aeration and calcification treatment.
By adopting the technical scheme, the papermaking wastewater with calcium ions is discharged into the conduit through the hydrolysis biochemical tank, and then diluted hydrochloric acid is added through the first chemical adding pipe for pre-acidification treatment, at the moment, CaCO3+2HCl→CaCl2+H2O+CO2The ↓ [ c ] relieves the probability of calcification to a certain extent; the subsequent addition of anaerobic tower calcification dispersing agent reduces the possibility of anaerobic bacteria being calcified (i.e. reduces CaCO of anaerobic bacteria)3The possibility of losing activity ahead of time due to precipitation wrapping) is increased, so that the capacity of the anaerobic tower for treating wastewater is improved; then the papermaking wastewater treated by the anaerobic tower is discharged into an aeration tank, and air (namely the air contains carbon dioxide gas) is continuously aerated in the water body, so that CO in the balance2Increase in concentrationEquilibrium moving in opposite directions, facilitating the precipitation of CaCO3And precipitation is carried out, so that the concentration of free calcium ions in the papermaking wastewater is reduced, the probability that anaerobic bacteria are calcified and die is reduced, and the capability of an anaerobic tower for treating the papermaking wastewater is improved.
The invention is further configured to: in step S2, the anaerobic calcification dispersing agent includes one or more of EDTMPA, EDTA, HEDP, or PAAS.
By adopting the technical scheme, the EDTMPA has strong capability of chelating metal ions, is a high-purity reagent and is non-toxic, is white crystalline powder at normal temperature, has a melting point of 215-. EDTMPA can be substituted almost everywhere EDTA is used as a chelating agent.
Ethylenediaminetetraacetic acid, EDTA, is a representative chelating agent, and it can be used as a calcium chelating agent. Meanwhile, it can form stable water-soluble complex with alkali metal, rare earth element and transition metal.
The hydroxyethylidene diphosphonic acid HEDP is an organic phosphoric acid scale and corrosion inhibitor, can form a stable complex with iron, copper, zinc and other metal ions, and can dissolve oxides on the metal surface. HEDP still can play good inhibition and scale inhibition effects at 250 ℃, is stable under high pH value, is not easy to hydrolyze, and is not easy to decompose under common photo-thermal conditions. The acid and alkali resistance and the chlorine and oxidation resistance are better than those of other organic phosphates. HEDP can form a six-ring chelate with metal ions in water, especially calcium ions, so HEDP has a good scale inhibition effect and an obvious solubility limit effect, and shows an ideal synergistic effect when being used in combination with other water treatment agents.
The sodium polyacrylate PAAS can disperse the microcrystal or silt of calcium carbonate, calcium sulfate and other salts in water without precipitation, thereby achieving the purpose of scale inhibition.
Therefore, the calcification speed of calcium ions in the anaerobic tower can be reduced by adopting any one of the four anaerobic calcification dispersing agents, so that the survival time and survival quantity of anaerobic sludge in the anaerobic tower are improved, the capability of the anaerobic tower for treating papermaking wastewater is improved, and the cost is saved.
The invention is further configured to: in step S2, the addition amount of the anaerobic calcification dispersing agent is controlled to 10-15PPm/1t water.
By adopting the technical scheme, 10-15PPm/1 ton of water means that 10-15PPm of anaerobic dispersing agent is added into one ton of paper-making wastewater, so that the calcification of calcium ions in the anaerobic tower on anaerobic sludge can be relieved, and the paper-making wastewater treatment capacity of the anaerobic tower is improved.
The invention is further configured to: in step S2, an electric heating wire is disposed on an outer wall of the catheter, and a temperature controller is disposed on a main circuit of the electric heating wire.
Because the anaerobic bacteria can stably survive and work at 30-40 ℃, the water body of the papermaking wastewater is frequently contacted with the atmosphere after various work such as sewage treatment and the like, the water temperature is kept about 25 ℃ at the moment, and the water temperature is not beneficial to the normal work of the anaerobic bacteria at the moment, the electric heating wire is arranged on the outer wall of the conduit by adopting the technical scheme, the electric heating wire heats the water body through the temperature controller, and when the water temperature is higher than 40 ℃, the electric heating wire stops heating the water body; when the water temperature is lower than 35 ℃, the electric heating wire is restarted and starts to heat the water body, so that the water temperature entering the anaerobic tower can be kept in an effective range of 35-40 ℃ all the time, the activity of anaerobic bacteria can be improved, and the capability of the anaerobic tower for treating the papermaking wastewater is further improved.
The invention is further configured to: the heating wire is vertically arranged, a bearing at the upper end of the heating wire is connected to the outer wall of the guide pipe, the lower end of the heating wire penetrates through the guide pipe and extends into the bottom of the pipeline, and a bearing sealing ring is arranged between the heating wire and the guide pipe.
Owing to add two kinds of liquid medicines of dilute hydrochloric acid and anaerobism tower calcium ion dispersant via adding pencil one and adding pencil two respectively in the pipe, the liquid medicine is more concentrated when adding medicine, can make the papermaking waste water that gets into in the anaerobism tower have the uneven phenomenon of local liquid medicine mixture, consequently through adopting above-mentioned technical scheme, push the electrothermal wire rotation under the effect of pump and rivers, not only can accelerate the liquid medicine mix and even dispersion in papermaking waste water this moment, but also can make the temperature evenly keep under 30-40 ℃, convenience very and laborsaving.
The invention is further configured to: the upper end of the electric heating wire is provided with a conductive brush which is fixedly connected on the outer wall of the conduit through a bracket.
Because the heating wire can influence the setting and the fixing of power when rotating, consequently through adopting above-mentioned technical scheme, adopt electrically conductive brush to replace the power wire, just can not influence the installation and the fixed of power, practicality very when keeping the heating wire pivoted from this.
The invention is further configured to: the electric heating wire is provided with a plurality of impeller blades.
Through adopting above-mentioned technical scheme, the installation of impeller blade has effectively improved the area of contact between impeller blade and the flowing water, and then has improved the stirring effect of impeller blade to the water to make liquid medicine in the papermaking waste water mix more even and quick.
The invention is further configured to: sodium carbonate was added in step S4 while passing excess air through an aeration tube.
By adopting the technical scheme, the CO in the papermaking wastewater is increased by adding the calcium carbonate and introducing air into the aeration tank2Content of gas, in this case CaCO3+2HCl→CaCl2+H2O+CO2The equilibrium at ×. is reversed, thereby increasing CaCO3The probability and the quantity of precipitation are separated out, and then the operator only needs to discharge the mud that sinks in the aeration tank through the sludge pump outside the aeration tank, can detach the calcium ion in the papermaking waste water to not only can reduce the calcification influence of calcium ion to anaerobism mud, but also can optimize the concentration of heavy metal in the water, thereby the effectual quality that has promoted papermaking waste water.
In conclusion, the invention has the following beneficial effects:
1. the invention reduces the calcification speed of calcium ions in the anaerobic tower and improves the capability of the anaerobic tower for treating papermaking wastewater;
2. by adding dilute hydrochloric acid and an anaerobic calcification dispersing agent, the content of calcium precipitates in the papermaking wastewater is reduced, and the wrapping calcification speed of anaerobic sludge is relieved, so that the capability of an anaerobic tower for treating the papermaking wastewater is improved;
3. by arranging the electric heating wire, the temperature of the water body is effectively controlled, and the activity of anaerobic bacteria is further improved.
Drawings
FIG. 1 is a schematic structural diagram of this embodiment 1;
FIG. 2 is a process flow chart of this example 1, which is mainly used to show the interconversion between the free calcium and the combined calcium in different steps of the process flow;
FIG. 3 is a perspective view of the catheter of this embodiment 6;
FIG. 4 is an enlarged view of A in FIG. 3, which is mainly used to show the relative positions and connection relationships among the conductive brush on the catheter, the stent and the outer wall of the catheter;
FIG. 5 is a perspective view of this embodiment 6 with the catheter removed;
fig. 6 is a perspective view of this embodiment 7 with the catheter removed.
Description of the drawings: 1. a conduit; 2. a first medicine adding pipe; 3. a second medicine feeding pipe; 4. an electric heating wire; 5. a conductive brush; 6. a support; 7. impeller blades.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example 1: a calcium control process of paper making wastewater for an anaerobic tower is shown in figures 1 and 2, and comprises the following operation steps:
step S1, pre-acidification: the papermaking wastewater treated by the hydrolysis biochemical tank flows into the guide pipe 1 from the water outlet, and then dilute hydrochloric acid flows into the guide pipe 1 through the first chemical feeding pipe 2 to adjust the pH value of the papermaking wastewater to 6-7.
And step S2, continuously adding anaerobic calcification dispersing agent from the second chemical adding pipe 3 into the pre-acidified papermaking wastewater, and controlling the temperature of the papermaking wastewater to be 35-40 ℃. The anaerobic calcification dispersing agent is a compound of EDTMPA and EDTA, the EDTMPA, namely the ethylenediamine tetramethylene phosphonic acid, is a high-purity reagent and is non-toxic, the EDTMPA is white crystalline powder at normal temperature, has a melting point of 215-217 ℃, is slightly soluble in water, has a solubility of less than 5% at room temperature, and is easily soluble in ammonia water. While ethylenediaminetetraacetic acid EDTA is a representative of chelating agents, it can be used as a calcium chelating agent. Therefore, the calcification speed of calcium ions in the anaerobic tower can be reduced by adopting any one of the two anaerobic calcification dispersing agents, so that the survival time and survival quantity of anaerobic sludge in the anaerobic tower are improved, the capability of the anaerobic tower for treating papermaking wastewater is improved, and the cost is saved.
And step S3, discharging the paper-making wastewater treated in the step S2 to the bottom of the anaerobic tower through a conduit 1 for wastewater treatment.
And step S4, discharging the paper-making wastewater after wastewater treatment into an aeration tank from a pipeline above the anaerobic tower for aeration and calcification treatment.
Example 2: a papermaking wastewater calcium control process for an anaerobic tower is different from that of the embodiment 1 in that: in step S2, the anaerobic calcification dispersing agent includes a combination of EDTMPA, EDTA, and HEDP. Wherein EDTMPA (ethylenediamine tetramethylene phosphonic acid) is a high-purity reagent and is non-toxic. While ethylenediaminetetraacetic acid EDTA is a representative of chelating agents, it can be used as a calcium chelating agent. In addition, the hydroxyethylidene diphosphonic acid HEDP is an organic phosphoric acid scale and corrosion inhibitor, can form a stable complex with iron, copper, zinc and other metal ions, and can dissolve oxides on the metal surface. Therefore, the calcification speed of calcium ions in the anaerobic tower can be reduced by adopting any one of the three anaerobic calcification dispersing agents, so that the survival time and survival quantity of anaerobic sludge in the anaerobic tower are improved, the capability of the anaerobic tower for treating papermaking wastewater is improved, and the cost is saved.
Example 3: a papermaking wastewater calcium control process for an anaerobic tower is different from that of the embodiment 1 in that: in step S2, the anaerobic calcification dispersing agent includes a combination of EDTMPA, EDTA, and PAAS. Wherein EDTMPA (ethylenediamine tetramethylene phosphonic acid) is a high-purity reagent and is non-toxic. While ethylenediaminetetraacetic acid EDTA is a representative of chelating agents, it can be used as a calcium chelating agent. In addition, the sodium polyacrylate PAAS can disperse the microcrystal or silt of calcium carbonate, calcium sulfate and other salts in water without precipitation, thereby achieving the purpose of scale inhibition. Therefore, the calcification speed of calcium ions in the anaerobic tower can be reduced by adopting any one of the three anaerobic calcification dispersing agents, so that the survival time and survival quantity of anaerobic sludge in the anaerobic tower are improved, the capability of the anaerobic tower for treating papermaking wastewater is improved, and the cost is saved.
Example 4: a papermaking wastewater calcium control process for an anaerobic tower is different from that of the embodiment 1 in that: in step S2, the anaerobic calcification dispersing agent includes a combination of EDTMPA, EDTA, HEDP, and PAAS. Wherein EDTMPA (ethylenediamine tetramethylene phosphonic acid) is a high-purity reagent and is non-toxic. While ethylenediaminetetraacetic acid EDTA is a representative of chelating agents, it can be used as a calcium chelating agent. Secondly, the hydroxyethylidene diphosphonic acid HEDP is an organic phosphoric acid scale and corrosion inhibitor, can form a stable complex with iron, copper, zinc and other metal ions, and can dissolve oxides on the metal surface. In addition, the sodium polyacrylate PAAS can disperse the microcrystal or silt of calcium carbonate, calcium sulfate and other salts in water without precipitation, thereby achieving the purpose of scale inhibition. Therefore, the calcification speed of calcium ions in the anaerobic tower can be reduced by adopting any one of the four anaerobic calcification dispersing agents, so that the survival time and survival quantity of anaerobic sludge in the anaerobic tower are improved, the capability of the anaerobic tower for treating papermaking wastewater is improved, and the cost is saved.
Example 5: a papermaking wastewater calcium control process for an anaerobic tower is different from that of the embodiment 1 in that: in step S2, the amount of anaerobic calcification dispersing agent added is controlled to 10-15PPm/1 ton of water. Wherein, the 10-15PPm/1t water means that the calcification of calcium ions in the anaerobic tower on anaerobic sludge can be relieved by adding 10-15PPm anaerobic dispersant into one ton of paper-making wastewater, and the capability of the anaerobic tower for treating the paper-making wastewater is improved.
Example 6: a papermaking wastewater calcium control process for an anaerobic tower is different from that of the embodiment 1 in that: as shown in figures 3 and 4, because the anaerobic bacteria can stably survive and work at 30-40 ℃, the water body of the papermaking wastewater is frequently contacted with the atmosphere after various work such as sewage treatment, and the like, the water temperature is kept about 25 ℃, and the water temperature is not favorable for the normal work of the anaerobic bacteria. Therefore, in order to enhance the activity of anaerobic bacteria, the heating wire 4 is installed on the outer wall of the catheter 1, and a temperature controller (not shown) is installed on the main circuit of the heating wire 4 in step S2. At the moment, the electric heating wire 4 heats the water body through the temperature controller, and when the water temperature is higher than 40 ℃, the electric heating wire 4 stops heating the water body; when the water temperature is lower than 35 ℃, the electric heating wire 4 is restarted and starts to heat the water body, so that the water temperature entering the anaerobic tower can be kept in an effective range of 35-40 ℃ all the time, the activity of anaerobic bacteria can be improved, and the capability of the anaerobic tower for treating the papermaking wastewater is further improved.
As shown in figure 1, two kinds of liquid medicines, namely dilute hydrochloric acid and the calcium ion dispersing agent of the anaerobic tower, are respectively added into the conduit 1 through the first medicine adding pipe 2 and the second medicine adding pipe 3, the liquid medicines are concentrated during medicine adding, and the phenomenon that local liquid medicines are mixed unevenly exists in papermaking wastewater entering the anaerobic tower. Referring to fig. 5, in order to accelerate the mixing of the liquid chemicals and uniformly disperse the liquid chemicals in the paper making wastewater, the heating wire 4 is vertically disposed, the upper end thereof is bearing-connected to the outer wall of the conduit 1, the lower end thereof passes through the conduit 1 and extends into the bottom of the pipe, and a bearing seal ring (not shown) is further installed between the heating wire 4 and the conduit 1. Therefore, the electric heating wire 4 is pushed to rotate under the action of the pump and water flow, so that the mixing of liquid medicine can be accelerated and the liquid medicine can be uniformly dispersed in the papermaking wastewater, and the water temperature can be uniformly kept at 30-40 ℃, thereby being very convenient and labor-saving.
Because the electric heating wire 4 can influence the setting and fixing of the power supply when rotating, in order to improve the stirring effect of the impeller blade 7 on the water body, the upper end of the electric heating wire 4 is provided with the conductive brush 5, and the upper end of the conductive brush 5 is fixedly connected on the outer wall of the conduit 1 through four brackets 6. Therefore, the rotation of the heating wire 4 is kept, and meanwhile, the installation and the fixation of a power supply are not influenced, and the electric heating wire heating device is very practical.
Example 7: a papermaking wastewater calcium control process for an anaerobic tower is different from that of the embodiment 1 in that: as shown in fig. 6, three sets of impeller blades 7 are installed on the heating wires 4, and the three sets of impeller blades 7 are axially distributed, and each heating wire 4 is obliquely and upwardly disposed. The contact area between the impeller blades 7 and the flowing water body is effectively increased, and further the stirring effect of the impeller blades 7 on the water body is improved, so that the liquid medicine in the papermaking wastewater is mixed more uniformly and quickly.
Example 8: a papermaking wastewater calcium control process for an anaerobic tower is different from that of the embodiment 1 in that: sodium carbonate was added in step S4 while passing excess air through an aeration tube. Thereby increasing CO in the papermaking wastewater2Content of gas, in this case CaCO3+2HCl→CaCl2+H2O+CO2The equilibrium at ×. is reversed, thereby increasing CaCO3The probability and the quantity of precipitation are separated out, and then the operator only needs to discharge the mud that sinks in the aeration tank through the sludge pump outside the aeration tank, can detach the calcium ion in the papermaking waste water to not only can reduce the calcification influence of calcium ion to anaerobism mud, but also can optimize the concentration of heavy metal in the water, thereby the effectual quality that has promoted papermaking waste water.
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (5)
1. A papermaking wastewater calcium control process for an anaerobic tower is characterized in that: comprises the following operation steps of the following steps of,
step S1, pre-acidification: the papermaking wastewater treated by the hydrolysis biochemical pool flows into the guide pipe (1) from the water outlet, and then dilute hydrochloric acid flows into the guide pipe (1) through the first chemical feeding pipe (2) to adjust the pH value of the papermaking wastewater to 6-7;
step S2, continuously adding an anaerobic calcification dispersing agent from the second chemical adding pipe (3) into the pre-acidified papermaking wastewater, and controlling the temperature of the papermaking wastewater to be 35-40 ℃;
step S3, discharging the papermaking wastewater treated in the step S2 into the bottom of an anaerobic tower through a conduit (1) for wastewater treatment;
step S4, discharging the paper-making wastewater after wastewater treatment into an aeration tank from a pipeline above an anaerobic tower for aeration and calcification treatment;
in step S2, an electric heating wire (4) is disposed on an outer wall of the catheter (1), a temperature controller is disposed on a main circuit of the electric heating wire (4), a conductive brush (5) is disposed at an upper end of the electric heating wire (4), the conductive brush (5) is fixedly connected to the outer wall of the catheter (1) through a support (6), and a plurality of impeller blades (7) are disposed on the electric heating wire (4).
2. The papermaking wastewater calcium control process for the anaerobic tower according to claim 1, characterized in that: in step S2, the anaerobic calcification dispersing agent includes one or more of EDTMPA, EDTA, HEDP, or PAAS.
3. The papermaking wastewater calcium control process for the anaerobic tower according to claim 2, characterized in that: in step S2, the addition amount of the anaerobic calcification dispersing agent is controlled to 10-15PPm/1t water.
4. The papermaking wastewater calcium control process for the anaerobic tower according to claim 3, characterized in that: the heating wire (4) is vertically arranged, the bearing at the upper end of the heating wire is connected to the outer wall of the guide pipe (1), the lower end of the heating wire penetrates through the guide pipe (1) and extends into the bottom of the pipeline, and a bearing sealing ring is arranged between the heating wire (4) and the guide pipe (1).
5. The papermaking wastewater calcium control process for the anaerobic tower according to claim 1 or 4, characterized in that: sodium carbonate was added in step S4 while passing excess air through an aeration tube.
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| CN110482781B (en) * | 2019-08-01 | 2021-12-10 | 广西大学 | Method for promoting anaerobic reaction and inhibiting calcification by treating high-calcium paper-making industrial wastewater with whey pre-acid |
| CN111018235A (en) * | 2019-11-21 | 2020-04-17 | 山鹰华南纸业有限公司 | Process for improving papermaking sewage treatment efficiency |
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