CN212713134U - Coking wastewater treatment system - Google Patents
Coking wastewater treatment system Download PDFInfo
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- CN212713134U CN212713134U CN202020894145.1U CN202020894145U CN212713134U CN 212713134 U CN212713134 U CN 212713134U CN 202020894145 U CN202020894145 U CN 202020894145U CN 212713134 U CN212713134 U CN 212713134U
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Abstract
The utility model belongs to the technical field of waste water treatment's environmental protection, concretely relates to coking wastewater treatment system, processing system includes: the pretreatment unit is used for reducing the oil content, the suspended solid content and the ammonia nitrogen content of the coking wastewater to obtain a pretreated wastewater clear liquid; the biochemical treatment unit is connected with a liquid outlet of the wastewater clear liquid after pretreatment of the pretreatment unit and is used for removing phenols and heterocyclic compounds and ammonia nitrogen compounds to obtain the wastewater clear liquid after biochemical treatment; and the oxidation filtering unit is connected with a liquid outlet of the wastewater clear liquid after biochemical treatment of the biochemical treatment unit and is used for removing organic matters by oxidation and removing solid suspended matters by filtration. The coking wastewater treatment system of the utility model can effectively remove oils, volatile phenols, cyanides, thiocyanides, ammonia nitrogen and the like contained in the coking wastewater, and does not produce secondary pollution.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment's environmental protection, concretely relates to coking wastewater treatment system.
Background
The coking wastewater is industrial wastewater containing a large amount of organic matters such as volatile phenol, polycyclic aromatic hydrocarbon, oxygen, sulfur, nitrogen and the like, which is generated in the processes of coking and coal gas high-temperature dry distillation, purification and byproduct recovery, and has three main sources: the residual ammonia water is the wastewater generated in the coal carbonization and coal gas cooling, the water amount of the residual ammonia water accounts for more than half of the total amount of the coking wastewater, and the residual ammonia water is the main source of the coking wastewater; secondly, the waste water produced in the coal gas purification process, such as final cold water of coal gas, crude benzene separation water and the like; and the third is the waste water produced in the refining process of tar, crude benzene and other places. Coking wastewater has large water quality and water quantity change and complex components, and pollutants comprise phenols, polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, oxygen and sulfur and the like, and are typical industrial wastewater containing organic compounds difficult to degrade, and easily degradable organic matters in the coking wastewater are mainly phenol compounds and benzene compounds, such as naphthalene, furan and imidazole, belonging to degradable organic matters. The refractory organic matters mainly comprise pyridine, carbazole, biphenyl, terphenyl and the like, the quality of the coking wastewater is greatly different due to the differences of the process flows and the production operation modes of various plants, and the refractory organic industrial wastewater belongs to high-concentration organic industrial wastewater which is difficult to biodegrade. Wherein, the phenolic compounds have toxic action on all organisms, can make cells lose vitality, and can make protein solidify to cause tissue damage and necrosis until the whole body is poisoned; polycyclic aromatic hydrocarbons are not only difficult to biodegrade, but also directly threaten human health. The treatment of coking wastewater is always a great problem in the field of domestic and foreign wastewater treatment, and the coking wastewater which is discharged in an overproof manner causes serious pollution to the environment.
In the prior art, the conventional treatment method of the coking wastewater is a process combining pretreatment, biochemical treatment and advanced treatment, wherein the pretreatment comprises ammonia distillation, phenol removal and decyanation by extraction, the biochemical treatment process comprises A/O (anoxic/aerobic), A2/O (anaerobic/anoxic/aerobic) and the advanced treatment is an activated carbon adsorption method.
However, the existing process has the defects of serious pollution, blockage and corrosion, immature process, unstable device operation and high operation cost. Because coking wastewater contains various nonbiodegradable organic matters, COD in the wastewater is difficult to effectively remove, and cyanide, COD, ammonia nitrogen and the like in the discharged wastewater are still difficult to reach the standard.
In view of this, the utility model discloses the application is specially proposed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a coking wastewater treatment system.
The coking wastewater treatment system of the utility model can effectively remove oils, volatile phenols, cyanides, thiocyanides, ammonia nitrogen and the like contained in the coking wastewater, and does not produce secondary pollution.
In order to achieve the technical effect, the technical scheme is as follows:
a coking wastewater treatment system, the treatment system comprising:
the pretreatment unit is used for reducing the oil content, the suspended solid content and the ammonia nitrogen content of the coking wastewater to obtain a pretreated wastewater clear liquid;
the biochemical treatment unit is connected with a liquid outlet of the wastewater clear liquid after pretreatment of the pretreatment unit and is used for removing phenols and heterocyclic compounds and ammonia nitrogen compounds to obtain the wastewater clear liquid after biochemical treatment;
and the oxidation filtering unit is connected with a liquid outlet of the wastewater clear liquid after biochemical treatment of the biochemical treatment unit and is used for removing organic matters by oxidation and removing solid suspended matters by filtration.
As an embodiment, the pretreatment unit comprises a wastewater adjusting tank, an oil removal tank, a primary coagulation flocculation tank, a primary clarifier, an ammonia distilling device and an ammonia absorbing device;
the liquid outlet of waste water regulating box and the access connection of deoiling pond, the liquid outlet of deoiling pond is connected and is helped the import of congealing the flocculation case, helps the import of congealing the one-level clarifier of liquid outlet connection of flocculation case, the import of the waste water clear solution exit linkage ammonia still device of one-level clarifier, ammonia absorbing device is connected to the gas vent of ammonia still device, the waste water clear solution exit linkage biochemical treatment unit of ammonia still device.
As an implementation mode, the solid-liquid containing outlet of the primary clarifier is connected with a plate-and-frame filter press, and the liquid outlet of the plate-and-frame filter press is connected with the inlet of a wastewater adjusting tank.
As an embodiment, the biochemical treatment unit comprises an anaerobic tank, an anoxic tank and an aerobic tank;
the anaerobic tank is connected with a clear wastewater outlet of the pretreatment unit, a liquid outlet of the anaerobic tank is connected with the anoxic tank, an outlet of the anoxic tank is connected with the aerobic tank, a backflow port of the aerobic tank is connected with the anoxic tank, and a liquid outlet of the aerobic tank is connected with the oxidation filtering unit.
As an embodiment, the oxidation filtering unit comprises a secondary clarifier, a neutralization tank, a strong oxidation tank, a secondary coagulation flocculation basin, a tertiary clarifier and a medium filtering device;
the liquid outlet of biochemical treatment unit is connected to the second grade clarification tank, and the liquid outlet of the waste water clear liquid of second grade clarifier is connected the neutralizing tank, and the liquid outlet and the strong oxidation case of neutralizing tank are connected, and the flocculation vat is helped to congeal to the second grade is connected to the liquid outlet of strong oxidation case, and tertiary clarifier is connected to the liquid outlet of the flocculation vat is helped to congeal by the second grade, and medium filter equipment is connected to the liquid outlet of the waste water clear liquid of tertiary clarifier.
As an embodiment, the medium filtering device comprises a fly ash filter and an activated carbon filter, the fly ash filter is connected with a liquid outlet of the waste water clear liquid of the three-stage clarifier, and the liquid outlet of the fly ash filter is connected with the activated carbon filter.
As an implementation mode, the solid-liquid containing outlet of the secondary clarifier and the solid-liquid containing outlet of the tertiary clarifier are both connected with a plate-and-frame filter press, and the liquid outlet of the plate-and-frame filter press is connected with the inlet of a wastewater regulating box.
Compared with the closest prior art, the utility model provides a technical scheme has following beneficial effect:
1. the utility model discloses a coking wastewater treatment system can pertinence processing coking wastewater through the sequencing of reasonable setting technology section and between each technology section, and processing technology is ripe reliable, can not only long-term continuous operation, and the water purification effect is stable moreover, play water stabilization of water quality is up to standard.
2. The utility model discloses a coking wastewater treatment system does not scale deposit, does not block up, and device operating stability is good, has reduced the maintenance cost in later stage, invests in rationally.
3. The utility model discloses a coking wastewater treatment's operation management is convenient, can be according to the undulant condition adjustment operational mode and the parameter of the quality of water of intaking, furthest performance throughput.
4. The coking wastewater treatment system of the utility model can realize the automatic control of the technological process, improve the management level and reduce the labor intensity and the labor cost.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Wherein:
FIG. 1 is a schematic structural diagram of a coking wastewater treatment system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
As shown in FIG. 1, the utility model provides a coking wastewater treatment system, the treatment system includes:
the pretreatment unit is used for reducing the oil content, the suspended solid content and the ammonia nitrogen content of the coking wastewater to obtain a pretreated wastewater clear liquid;
the biochemical treatment unit is connected with a liquid outlet of the wastewater clear liquid after pretreatment of the pretreatment unit and is used for removing phenols and heterocyclic compounds and ammonia nitrogen compounds to obtain the wastewater clear liquid after biochemical treatment;
and the oxidation filtering unit is connected with a liquid outlet of the wastewater clear liquid after biochemical treatment of the biochemical treatment unit and is used for removing organic matters by oxidation and removing solid suspended matters by filtration.
The coking wastewater treatment system can effectively remove oils, volatile phenols, cyanides, thiocyanides, ammonia nitrogen and the like contained in the coking wastewater, and does not generate secondary pollution.
As an implementation mode of the utility model, the pretreatment unit comprises a wastewater adjusting box, an oil removal tank, a primary coagulation flocculation tank, a primary clarifier, an ammonia evaporation device and an ammonia absorption device;
the liquid outlet of waste water regulating box and the access connection of deoiling pond, the liquid outlet of deoiling pond is connected and is helped the import of congealing the flocculation case, helps the import of congealing the one-level clarifier of liquid outlet connection of flocculation case, the import of the waste water clear solution exit linkage ammonia still device of one-level clarifier, ammonia absorbing device is connected to the gas vent of ammonia still device, the waste water clear solution exit linkage biochemical treatment unit of ammonia still device.
The utility model discloses at the implementation in-process, can specifically set up the volume of waste water regulating box into coking wastewater treatment capacity's 24 times, adjust the quality of water yield through the storage of one day, guarantee to get into follow-up processing apparatus's stability of intaking, according to the undulant condition adjustment operational mode and the parameter of the quality of water of intaking, furthest performance waste water treatment ability.
The coking wastewater can be various wastewater produced in the coking chemical industry.
As an embodiment of the utility model, the solid-liquid outlet that contains of one-level clarifier connects plate and frame filter press, through plate and frame filter press with solid-liquid separation, the import of waste water regulating box is connected to plate and frame filter press's liquid outlet, and the liquid that comes from plate and frame filter press gets into waste water regulating box, carries out the preliminary treatment again.
As an embodiment of the present invention, the biochemical treatment unit includes an anaerobic tank, an anoxic tank and an aerobic tank;
the anaerobic tank is connected with a clear wastewater outlet of the pretreatment unit, a liquid outlet of the anaerobic tank is connected with the anoxic tank, an outlet of the anoxic tank is connected with the aerobic tank, a backflow port of the aerobic tank is connected with the anoxic tank, and a liquid outlet of the aerobic tank is connected with the oxidation filtering unit.
As an embodiment of the utility model, the oxidation filtering unit comprises a secondary clarifier, a neutralization tank, a strong oxidation tank, a secondary coagulation flocculation basin, a tertiary clarifier and a medium filtering device;
the liquid outlet of biochemical treatment unit is connected to the second grade clarification tank, and the liquid outlet of the waste water clear liquid of second grade clarifier is connected the neutralizing tank, and the liquid outlet and the strong oxidation case of neutralizing tank are connected, and the flocculation vat is helped to congeal to the second grade is connected to the liquid outlet of strong oxidation case, and tertiary clarifier is connected to the liquid outlet of the flocculation vat is helped to congeal by the second grade, and medium filter equipment is connected to the liquid outlet of the waste water clear liquid of tertiary clarifier.
As an embodiment of the present invention, the medium filtering device includes a fly ash filter and an activated carbon filter, the fly ash filter is connected with the liquid outlet of the wastewater clear liquid of the three-stage clarifier, and the liquid outlet of the fly ash filter is connected with the activated carbon filter.
As an embodiment of the utility model, the solid-liquid outlet of the secondary clarifier and the solid-liquid outlet of the tertiary clarifier are connected with the plate-and-frame filter press, and the liquid outlet of the plate-and-frame filter press is connected with the inlet of the wastewater adjusting box.
The following will be described in more detail in connection with the general working process of the coking wastewater treatment system of the present invention:
in order to reduce the subsequent biochemical treatment load, reduce the impact load of toxic substances and stabilize the subsequent biochemical treatment effect, the coking wastewater enters the pretreatment unit for pretreatment before entering the biochemical treatment unit, so that the operation management is facilitated.
The import of waste water regulating box and the exit linkage of pending coking waste water, coking waste water gets into the waste water regulating box, carries out quality of water volume regulation, and the main effect of waste water regulating box is the quality of water and the water yield of balanced waste water, guarantees the stability of follow-up processing facility operation.
The coking wastewater regulated by the wastewater regulating box enters an oil removal tank, the oil content is reduced to be below 30mg/l, the oil content is lower than the concentration influencing the normal growth of microorganisms, then the coking wastewater is discharged into a primary coagulation flocculation tank (also called a primary coagulation flocculation tank), a coagulant aid and a flocculating agent (PAC and PAM) are added to coagulate small particles in the coking wastewater into large particles, and then the coking wastewater enters a primary clarifier to carry out mud-water separation, so that the content of suspended matters and part of organic matters is reduced.
In order to control the content of ammonia nitrogen in the coking wastewater entering the biochemical treatment unit to be 150-200 ppm, the coking wastewater firstly enters an ammonia distillation device, and 1.3MPa of steam is introduced into the coking wastewater to heat the coking wastewater to 150 ℃, so that the content of ammonia nitrogen is reduced.
Specifically, the steam is 1.3MPa steam from plant production based on the requirements of maximizing the use of existing conditions, reducing costs, and providing a resource utilization effect.
Coking wastewater after the preliminary reduction treatment of ammonia nitrogen and COD is introduced into the biochemical treatment unit, passes through the anaerobic tank, the anoxic tank and the aerobic tank in sequence, and the specific treatment process of the biochemical treatment unit is as follows:
(1) the coking wastewater firstly enters an anaerobic tank (anaerobic acidification section), phenol, xylenol, quinoline, isoquinoline, indole, pyridine and other heterocyclic compounds in the coking wastewater are largely converted or removed, and the anaerobic acidification section is very beneficial to the conversion and removal of complex organic matters.
(2) Coking wastewater from the anaerobic tank enters an anoxic tank (anoxic section) to mainly carry out denitrification reaction, nitrate nitrogen is converted into nitrogen through the treatment of the anoxic section, the aim of denitrification is achieved, and meanwhile, most organic matters in the wastewater are further removed, so that the coking wastewater with lower COD is obtained.
Because the denitrification carbon source contained in the coking wastewater is insufficient, methanol is required to be added into the anoxic tank to be used as a supplementary carbon source, and simultaneously, part of the wastewater mainly containing nitrate nitrogen obtained after the treatment of the aerobic tank flows back to the anoxic section to provide the nitrate nitrogen for the anoxic section.
(3) The coking wastewater treated by the anoxic section enters an aerobic tank (aerobic section), and because the content of ammonia nitrogen in the coking wastewater is high and COD is low, the coking wastewater is mainly subjected to nitration reaction, a sodium carbonate solution is required to be added to regulate and control the alkalinity required by the nitration reaction, and the pH is controlled to be between 7.3 and 7.8.
After the coking wastewater is treated by the aerobic section, ammonia nitrogen can be basically and completely converted into nitrate, and the nitrate flows back to the anoxic section and is finally converted into nitrogen in the anoxic section, so that effective denitrification is achieved, and meanwhile, organic matters are further degraded.
The utility model discloses a rationally set up the order in anaerobism pond, oxygen deficiency pond and the good oxygen pond among the above-mentioned biochemical treatment unit, combine together with pretreatment unit and oxidation filter unit, reach better waste water purification treatment effect.
The liquid outlet of the aerobic tank is connected with the secondary clarification tank, the wastewater enters the secondary clarification tank for mud-water separation after being treated by the biochemical treatment unit, then enters the neutralization tank, the pH value of the wastewater is adjusted to 3-3.5, hydrogen peroxide and ferrous sulfate are added to obtain a strong oxidant, the strong oxidant can generate OH free radicals with very strong oxidizing capability, organic matters are further removed, the COD is reduced, the reaction conditions such as the reaction speed, the temperature and the pressure are mild, no secondary pollution is caused, and the COD value of the coking wastewater can be reduced to 30-50 mg/L.
In order to reduce the dosing amount of hydrogen peroxide and ferrous sulfate and ensure the sufficiency of reaction, compressed air is introduced into a strong oxidation box for aeration, so that the moving equipment is reduced, the investment cost is reduced, the failure rate of the moving equipment is reduced, and the operation stability of the whole system is better.
After the series of reactions, a large amount of suspended matters are generated in the coking wastewater, in order to remove the suspended matters, the wastewater is introduced into a secondary coagulation flocculation tank (also called a secondary coagulation flocculation tank), small particles in the wastewater are coagulated into large particles by adding a coagulant aid and a flocculant (PAC and PAM), and then the large particles enter a tertiary clarifier (also called a tertiary clarifier) for sludge-water separation, so that the effect of further reducing the content of the suspended matters and part of organic matters is achieved.
And finally, filtering by a fly ash filter and an activated carbon filter to obtain the waste water with low content of organic matters and ammonia nitrogen.
The coking wastewater treatment system of the utility model adopts a coking wastewater treatment method as follows, which comprises the following steps:
step 1, reducing the oil content, the suspended solid content and the ammonia nitrogen content of the coking wastewater to obtain a pretreated wastewater clear solution;
step 2, removing phenols and heterocyclic compounds in the pretreated wastewater clear liquid, removing ammonia nitrogen compounds, and reducing the content of organic matters to obtain the wastewater clear liquid after biochemical treatment;
and 3, oxidizing to remove organic matters, flocculating and filtering to remove solid suspended matters to obtain the dischargeable wastewater.
As an implementation mode, the method for reducing the content of ammonia nitrogen comprises the following steps:
introducing 1.3MPa steam into the coking wastewater, heating the coking wastewater to the temperature of 130 ℃ and 150 ℃, and controlling the content of the ammonia nitrogen compound to be 150-200 ppm.
Preferably, said step 1 controls the oil content of the coking wastewater to be less than 30mg/l as one embodiment.
Preferably, as an embodiment, the biochemical treatment comprises, in chronological order:
anaerobic acidification reaction, which is used for removing phenol, xylenol, quinoline, isoquinoline, indole and pyridine in the coking wastewater to obtain acidified coking wastewater;
performing denitrification reaction, namely converting nitrate nitrogen into nitrogen by using methanol as a carbon source for denitrification;
and (3) nitration reaction, which is used for converting ammonia nitrogen into nitrate nitrogen, wherein the obtained nitrate nitrogen flows back to the denitrification reaction process according to a set proportion to be used as a nitrate nitrogen source.
The adding amount of the methanol is related to the nitrate amount in the wastewater, and the methanol is added according to the nitrate amount.
The amount of the obtained nitrate nitrogen which flows back to the denitrification reaction process is adjusted according to 200-300 v% of the inflow of the treated coking wastewater.
Preferably, as an embodiment, in the nitration reaction, Na is added2CO3And controlling the pH value of the coking wastewater to be 7.3-7.8.
In one embodiment, the step 3 includes a step of treating with a fly ash filter and an activated carbon filter, wherein the amount of fly ash added to the fly ash filter is 1.5-2.0 g/100mL per 100mL of the filter, and the soaking time of the coking wastewater in the fly ash filter is 30-60 min. The fly ash can be modified fly ash directly purchased from the market.
The main components of the fly ash are silicon dioxide and silicate, and when the fly ash is used as an adsorbent for deeply treating coking wastewater, the decolorizing effect is good, the removing effect on volatile phenol, oil and the like is good, the COD removing efficiency is high, and the cost is low. Particularly, when the addition amount of the fly ash is 1.5-2.0 g/100mL and the dipping time is 30-60 min, the treated wastewater can reach the discharge standard except ammonia nitrogen, the ammonia nitrogen content is close to the near value of the standard, and the wastewater is further treated by an activated carbon filter to ensure that the effluent reaches the standard.
Preferably, the particle size of the powdered activated carbon in the activated carbon filter is 0.09mm, and the removal efficiency of the coking wastewater COD is up to 98.5% when the particle size of the powdered activated carbon is 0.09 mm.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the following claims are intended to cover all modifications, equivalents, and improvements falling within the spirit and principles of the present invention.
Claims (7)
1. A coking wastewater treatment system, characterized in that the treatment system comprises:
the pretreatment unit is used for reducing the oil content, the suspended solid content and the ammonia nitrogen content of the coking wastewater to obtain a pretreated wastewater clear liquid;
the biochemical treatment unit is connected with a liquid outlet of the wastewater clear liquid after pretreatment of the pretreatment unit and is used for removing phenols and heterocyclic compounds and ammonia nitrogen compounds to obtain the wastewater clear liquid after biochemical treatment;
and the oxidation filtering unit is connected with a liquid outlet of the wastewater clear liquid after biochemical treatment of the biochemical treatment unit and is used for removing organic matters by oxidation and removing solid suspended matters by filtration.
2. The coking wastewater treatment system of claim 1, wherein the pretreatment unit comprises a wastewater conditioning tank, an oil removal tank, a primary coagulation flocculation basin, a primary clarifier, an ammonia still and an ammonia gas absorption device;
the liquid outlet of waste water regulating box and the access connection of deoiling pond, the liquid outlet of deoiling pond is connected and is helped the import of congealing the flocculation case, helps the import of congealing the one-level clarifier of liquid outlet connection of flocculation case, the import of the waste water clear solution exit linkage ammonia still device of one-level clarifier, ammonia absorbing device is connected to the gas vent of ammonia still device, the waste water clear solution exit linkage biochemical treatment unit of ammonia still device.
3. The coking wastewater treatment system of claim 2, wherein the solid-liquid containing outlet of the primary clarifier is connected to a plate-and-frame filter press, and the liquid outlet of the plate-and-frame filter press is connected to the inlet of the wastewater conditioning tank.
4. The coking wastewater treatment system of claim 1, wherein the biochemical treatment unit includes an anaerobic tank, an anoxic tank, and an aerobic tank;
the anaerobic tank is connected with a clear wastewater outlet of the pretreatment unit, a liquid outlet of the anaerobic tank is connected with the anoxic tank, an outlet of the anoxic tank is connected with the aerobic tank, a backflow port of the aerobic tank is connected with the anoxic tank, and a liquid outlet of the aerobic tank is connected with the oxidation filtering unit.
5. The coking wastewater treatment system of claim 1, wherein the oxidizing and filtering unit comprises a secondary clarifier, a neutralization tank, a strong oxidation tank, a secondary coagulation flocculation basin, a tertiary clarifier, a media filtering device;
the liquid outlet of biochemical treatment unit is connected to the second grade clarification tank, and the liquid outlet of the waste water clear liquid of second grade clarifier is connected the neutralizing tank, and the liquid outlet and the strong oxidation case of neutralizing tank are connected, and the flocculation vat is helped to congeal to the second grade is connected to the liquid outlet of strong oxidation case, and tertiary clarifier is connected to the liquid outlet of the flocculation vat is helped to congeal by the second grade, and medium filter equipment is connected to the liquid outlet of the waste water clear liquid of tertiary clarifier.
6. The coking wastewater treatment system of claim 5, wherein the media filter device comprises a fly ash filter and an activated carbon filter, the fly ash filter is connected with the liquid outlet of the wastewater clear liquid of the three-stage clarifier, and the liquid outlet of the fly ash filter is connected with the activated carbon filter.
7. The coking wastewater treatment system of claim 5, wherein the solid-liquid containing outlet of the secondary clarifier and the solid-liquid containing outlet of the tertiary clarifier are both connected to a plate-and-frame filter press, and the liquid outlet of the plate-and-frame filter press is connected to the inlet of the wastewater conditioning tank.
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| CN202020894145.1U CN212713134U (en) | 2020-05-25 | 2020-05-25 | Coking wastewater treatment system |
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| CN202020894145.1U CN212713134U (en) | 2020-05-25 | 2020-05-25 | Coking wastewater treatment system |
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