CN113024036A - Wastewater treatment system - Google Patents
Wastewater treatment system Download PDFInfo
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- CN113024036A CN113024036A CN202110288357.4A CN202110288357A CN113024036A CN 113024036 A CN113024036 A CN 113024036A CN 202110288357 A CN202110288357 A CN 202110288357A CN 113024036 A CN113024036 A CN 113024036A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a wastewater treatment system, which comprises a triple-effect evaporator, a salt-rich residue treatment equipment group, an organic matter treatment equipment group and a distilled condensate water treatment equipment group which are connected with the triple-effect evaporator, and a heat recovery equipment group, wherein the heat recovery equipment group comprises a first cooling water tank, a circulating water tank and a steam boiler, the first cooling water tank is communicated with a distilled condensate water outlet of the triple-effect evaporator, a plate heat exchanger is arranged in the first cooling water tank, a heat exchange flow channel in the plate heat exchanger is communicated with the circulating water tank to form a heat exchange flow path, a fluid driving device is arranged on the heat exchange flow path, the circulating water tank is also connected with the steam boiler, steam generated by the steam boiler is used for being provided to the salt-rich residue treatment equipment group and the distilled condensate water treatment equipment group, and a. The wastewater treatment system provided by the invention is beneficial to fully utilizing heat energy and improving the distillation efficiency.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment system.
Background
In the chemical industry production process, especially in the fine chemical product production process, various acidic, alkaline and neutral chemical raw materials can often be used, these chemical raw materials are after the chemical synthesis reaction production product is handled through multichannel process, often can be accompanied with the production of waste water, and often contain very high salinity in the waste water, these salinity dissolve the waste water that forms high salinity in the waste water, and often still remain a certain amount of organic matters in the waste water and remain, make the COD content of water high, at fine chemical product chemical reaction synthesis process, often emit a large amount of heats simultaneously, make the waste water temperature who produces very high. The treatment of the high-salinity, high-temperature and high-COD fine chemical wastewater becomes a difficult problem in the wastewater treatment industry, a large amount of chemical reagents and agents are often required to be added into the wastewater to remove the salinity in the water body by chemical reaction, and the treatment processes often cause the use of a large amount of chemical reagents and agents; meanwhile, the cooling tower equipment is adopted to forcibly cool the temperature of the wastewater water body, otherwise, the biochemical bacteria in the subsequent biochemical treatment process are seriously influenced, but the forced cooling of the water body greatly increases the energy consumption; in addition, high-load biochemical treatment such as anaerobic treatment and aerobic treatment, even strong oxidant assistance is needed to carry out degradation decomposition treatment on organic matter residues causing high COD content in the water body, so as to reduce the COD content in the water body, and thus, the working procedures and investment cost of wastewater treatment are greatly increased, and the wastewater treatment efficiency is low. These measures make the treatment of the high-salinity, high-temperature, high-COD content fine chemical wastewater very costly and inefficient. These seriously restrict the development of production enterprises, and become a difficult problem to be solved urgently in the fine chemical industry.
Disclosure of Invention
In view of this, the present invention aims to provide a wastewater treatment system with low energy consumption and high efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wastewater treatment system is used for treating high-salt high-temperature fine chemical wastewater, and comprises a triple-effect evaporator, a salt-rich residue treatment equipment group, an organic matter treatment equipment group and a distillation condensate treatment equipment group which are connected with the triple-effect evaporator, and further comprises a heat recovery equipment group, wherein the heat recovery equipment group comprises a first cooling water tank, a circulating water tank and a steam boiler, the first cooling water tank is communicated with a distillation condensate outlet of the triple-effect evaporator, a plate heat exchanger is arranged in the first cooling water tank, a heat exchange flow channel in the plate heat exchanger is communicated with the circulating water tank to form a heat exchange flow path, a fluid driving device is arranged on the heat exchange flow path, the circulating water tank is further connected with the steam boiler, and steam generated by the steam boiler is used for providing the salt-rich residue treatment equipment group and the distillation condensate treatment equipment group, and the water outlet of the first cooling water tank is communicated with the distilled condensed water treatment equipment group.
Preferably, a plurality of baffle plates are arranged in the first cooling water pool, the baffle plates separate the space of the first cooling water pool to form a circuitous water flow channel, and a plurality of plate heat exchangers are arranged in the water flow channel at intervals.
Preferably, the salt-rich residue treatment equipment set comprises a concentration kettle, a centrifuge, a tray dryer and an activated carbon tank, wherein a residual organic matter outlet of the concentration kettle is communicated with the organic matter treatment equipment set, a residue discharge outlet of the concentration kettle is communicated with an inlet of the centrifuge, a liquid outlet of the centrifuge is communicated with the first cooling water tank, a solid outlet is communicated with an inlet of the tray dryer, and a gas outlet of the tray dryer is communicated with the activated carbon tank.
Preferably, distillation comdenstion water treatment facilities group is including the cooling tower, second cooling water tank, comprehensive equalizing basin, anaerobism pond, good oxygen pond and the sedimentation tank that connect gradually, the clear water district of sedimentation tank is through transfer pond and sand filter intercommunication, the sludge bucket and the concentrated pond of sludge intercommunication of sedimentation tank, cooling tower with the delivery port intercommunication in first cooling water tank, comprehensive equalizing basin is used for carrying out the regulation of PH value, temperature and chemical oxygen demand to waste water.
Preferably, a SS value detection device is arranged in the second cooling water tank, a first bypass pipe is further connected to a connecting pipeline between the second cooling water tank and the comprehensive adjusting tank, and the first bypass pipe is connected to the comprehensive adjusting tank through a flocculation tank.
Preferably, a second by-pass pipe is further connected to a connecting pipeline between the anaerobic tank and the aerobic tank, and the second by-pass pipe is connected to the aerobic tank through a facultative tank.
Preferably, a third bypass pipe is further connected to a connecting pipeline between the sludge bucket of the sedimentation tank and the sludge concentration tank, and the third bypass pipe is connected to the aerobic tank.
Preferably, a water quality detection device is arranged in the transfer tank, a fourth bypass pipe is further connected to a connecting pipeline between the transfer tank and the sand filter tank, and the fourth bypass pipe is connected to the aerobic tank.
Preferably, a first temperature sensor is arranged in the first cooling water pool, the cooling water towers are provided with a plurality of cooling water towers, and the first switching pipe group is used for controlling at least one part of the plurality of cooling water towers to be connected in parallel or in series into a water path.
Preferably, the anaerobic pool comprises a plurality of anaerobic reactors and a second switching pipe group, wherein the second switching pipe group is used for controlling at least one part of the plurality of anaerobic reactors to be connected into a water circuit in parallel or in series.
In the wastewater treatment system provided by the invention, the triple-effect evaporator is adopted for vacuum reduced pressure distillation, so that the full utilization of heat energy is facilitated, the distillation efficiency is improved, the temperature of distilled wastewater, organic matters and residues is reduced, a powerful condition is provided for the subsequent production and reuse of the organic matters, the influence on the quality of the reused organic matters due to the oxidation of the reused organic matters caused by high temperature is avoided, the water temperature of generated wastewater is reduced, and the load and energy consumption caused by the subsequent forced cooling of a water body are reduced. The waste water treatment system is also provided with a heat recovery device group, the heat energy of the high-temperature waste water is comprehensively utilized and can be recycled for the salt-rich residue treatment device group and the distilled condensate water treatment device group of the waste water treatment system, the requirements of all parts of waste water treatment on treatment temperature are ensured while waste heat is recovered, and the waste water treatment efficiency is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a schematic diagram showing a wastewater treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the construction of a heat recovery plant in a wastewater treatment system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a connection structure of a plurality of cooling towers provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the structure of a sludge hopper of a sedimentation tank in a wastewater treatment system according to an embodiment of the present invention.
In the figure:
1. a triple effect evaporator; 21. a concentration kettle; 22. a centrifuge; 23. a dish dryer; 24. an activated carbon canister; 3. an organic matter treatment facility group; 41. a cooling water tower; 411. a first main water outlet pipe; 412. a first branch water pipe; 413. a first main water inlet pipe; 414. a first branch water inlet pipe; 415. a first series branch; 42. a second cooling water pool; 421. a flocculation tank; 43. a comprehensive adjusting tank; 44. an anaerobic tank; 441. a facultative tank; 45. an aerobic tank; 46. a sedimentation tank; 461. a drive shaft; 47. a transfer pool; 48. a sand filter; 49. a sludge concentration tank; 51. a first cooling water pool; 511. a plate heat exchanger; 512. a baffle plate; 52. a circulating water tank; 53. a steam boiler; 100. a stirring sheet; 101. a first stirring section; 102. a second stirring section; 1021. an upper edge portion; 1022. a lower edge portion.
Detailed Description
The present invention is described below based on embodiments, and it will be understood by those of ordinary skill in the art that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
The application provides a wastewater treatment system for handle the fine chemical industry waste water of high salt high temperature, as shown in figure 1, wastewater treatment system include three effect evaporator 1 and with the rich salt residue treatment facility group, organic matter treatment facility group 3 and the distillation condensate water treatment facility group that three effect evaporator 1 is connected, the fine chemical industry waste water of high salinity, high temperature, high COD content gets into and carries out vacuum reduced pressure distillation in three effect evaporator 1 and handle, the vacuum degree is preferred- (0.01 ~ 0.05) MPa, the remaining organic matter after the processing gets into organic matter treatment facility group 3 and handles, organic matter treatment facility group 3 for example is the purification recovery workshop, the organic matter of decompression distillation vacuum, can return to the workshop by the pump and purify etc. corresponding recovery processing, organic matter content in the waste water body has been reduced, also reduce the COD content of waste water, realize the resource recycle of organic matter simultaneously, the yield of the product is improved, the salt-rich residue enters the salt-rich residue treatment equipment set for treatment, and the distilled condensed water enters the distilled condensed water treatment equipment set for treatment.
The wastewater treatment system further comprises a heat recovery equipment group, the heat recovery equipment group comprises a first cooling water tank 51, a circulating water tank 52 and a steam boiler 53, the first cooling water tank 51 is communicated with a distillation condensate outlet of the triple-effect evaporator 1, a plate heat exchanger 511 is arranged in the first cooling water tank 51, a heat exchange flow channel in the plate heat exchanger 511 is communicated with the circulating water tank 52 to form a heat exchange flow path, a fluid driving device is arranged on the heat exchange flow path, the circulating water tank 52 is further connected with the steam boiler 53, steam generated by the steam boiler 53 is used for providing the salt-rich residue treatment equipment group and the distillation condensate treatment equipment group, and a water outlet of the first cooling water tank 51 is communicated with the distillation condensate treatment equipment group. The distilled condensed water enters the first cooling water pool 51, the distilled condensed water exchanges heat with the plate heat exchanger 511 in the first cooling water pool 51, fluid in the plate heat exchanger 511 enters the steam boiler 53 under the driving of the fluid driving device after exchanging heat with the distilled condensed water so as to increase the heat of the steam boiler 53, and steam generated by the steam boiler 53 is applied to heating equipment needing heat in the salt-rich residue treatment equipment group and the distilled condensed water treatment equipment group.
In the wastewater treatment system provided by the invention, the triple-effect evaporator 1 is adopted for vacuum reduced pressure distillation, so that the full utilization of heat energy is facilitated, the distillation efficiency is improved, the temperature of distilled wastewater, organic matters and residues is reduced, a powerful condition is provided for the subsequent production and reuse of the organic matters, the influence on the quality caused by the oxidation of the reused organic matters due to high temperature is avoided, the water temperature of generated wastewater is reduced, and the load and energy consumption caused by the subsequent forced cooling of a water body are reduced. The waste water treatment system is also provided with a heat recovery device group, the heat energy of the high-temperature waste water is comprehensively utilized and can be recycled for the salt-rich residue treatment device group and the distilled condensate water treatment device group of the waste water treatment system, the requirements of all parts of waste water treatment on treatment temperature are ensured while waste heat is recovered, and the waste water treatment efficiency is improved.
In order to improve the heat exchange efficiency between the first cooling water pool 51 and the plate heat exchanger 511, in a preferred embodiment, as shown in fig. 2, a plurality of baffle plates 512 are arranged in the first cooling water pool 51, the baffle plates 512 partition the space of the first cooling water pool 51 to form a circuitous water flow channel, a water outlet of the first cooling water pool 51 is arranged at the end of the water flow channel, a plurality of plate heat exchangers 511 are arranged at intervals in the water flow channel, and the flow channels in the plurality of plate heat exchangers 511 are connected in series and then connected to the circulating water tank 52, so that the water flow can flow along the circuitous water flow channel, thereby performing sufficient heat exchange with the plate heat exchanger 511.
Further, the salt-rich residue treatment equipment group comprises a concentration kettle 21, a centrifuge 22, a tray dryer 23 and an activated carbon tank 24, wherein a residual organic matter outlet of the concentration kettle 21 is communicated with the organic matter treatment equipment group 3, a residue discharge outlet of the concentration kettle 21 is communicated with an inlet of the centrifuge 22, a liquid outlet of the centrifuge 22 is communicated with the first cooling water tank 51, a solid outlet is communicated with an inlet of the tray dryer 23, and a gas outlet of the tray dryer 23 is communicated with the activated carbon tank 24. Pumping the residue rich in salt obtained by vacuum distillation under reduced pressure to a concentration kettle 21 for further vacuum concentration treatment, wherein the vacuum degree of the concentration kettle 21 is preferably (0.001-0.01) MPa, and the residual organic matters treated by the concentration kettle 21 are returned to an organic matter treatment equipment set 3 for corresponding recovery treatment such as purification; discharging the salt residue treated by the concentration kettle 21 from the bottom of the concentration kettle 21, and drying and reducing, specifically, dividing the drying into two parts, including performing solid-liquid separation on the salt residue in a centrifuge 22, removing water with the mass percentage content of more than 70% in the residue, drying the salt residue subjected to solid-liquid separation by the centrifuge 22 in a disc dryer 23 to form dry solid waste, wherein the drying temperature of the disc dryer 23 is 50-100 ℃, so that the reduction treatment of the solid waste is realized. The moisture that solid-liquid separation goes into first cooling water pond 51 also, and the solid useless handing over of formation is by the innocent treatment of qualification unit, and the flue gas that dry minimizing produced, after activated carbon canister 24 adsorption treatment, the environmental protection is discharged, activated carbon canister 24 adsorption treatment adopts autonomic breathing control mode, and no electric energy consumption also need not the operation, is convenient for stable operation.
Further, distillation comdenstion water treatment facilities group is including the cooling tower 41, second cooling water pond 42, comprehensive equalizing basin 43, anaerobism pond 44, good oxygen pond 45 and the sedimentation tank 46 that connect gradually, the clear water district of sedimentation tank 46 is through transfer pond 47 and sand filter 48 intercommunication, the sludge bucket and the sludge thickening pond 49 intercommunication of sedimentation tank 46, cooling tower 41 with the delivery port intercommunication of first cooling water pond 51, comprehensive equalizing basin 43 is used for carrying out the regulation of PH value, temperature and chemical oxygen demand to waste water.
The water in the first cooling water pool 51 is cooled by heat exchange through the plate heat exchanger 511, flows out from a water outlet thereof, is cooled by the cooling water tower 41 through a centrifugal pump, and then enters the second cooling water pool 42, wherein preferably, a first temperature sensor is arranged in the first cooling water pool 51, a plurality of cooling water towers 41 are arranged, and the first switching pipe group is further included for controlling at least a part of the plurality of cooling water towers 41 to be connected in parallel or in series into the water channel, so that the composition mode of the cooling water tower 41 can be adjusted and switched in series and parallel according to the temperature control of the control valve of the corresponding pipeline, thereby adjusting and switching the composition mode of the cooling water tower 41 in real time according to the water temperature condition of the first cooling water pool 51, further reducing the energy consumption of the wastewater in the cooling link of the cooling water tower 41, and improving the cooling efficiency and the treatment efficiency of the wastewater, the heat exchange and cooling treatment and the comprehensive utilization of heat energy of the high-temperature distillation condensate water are realized.
For example, in the embodiment shown in fig. 3, the water outlet of the first cooling water tank 51 is connected to the first total water outlet pipe 411, a first branch water pipe 412 is disposed between the first total water outlet pipe 411 and each cooling water tower 41, the water inlet of the second cooling water tank 42 is connected to the first total water inlet pipe 413, a first branch water inlet pipe 414 is disposed between the first total water inlet pipe 413 and each cooling water tower 41, and the outlet of the left cooling water tower 41 in the adjacent cooling water tower 41 is further connected to the inlet of the right cooling water tower 41 through the first serial branch 415. Thus, when the water temperature is low, all cooling towers 41 can be arranged in parallel, and when the water temperature is high, one or more cooling towers 41 can be selected to be connected in series.
The wastewater in the second cooling water tank 42 enters the comprehensive regulating tank 43 through a chemical pump through a pipeline, the pH value, the water temperature and the influent COD of the wastewater are regulated in the comprehensive regulating tank 43, and the wastewater regulated by the comprehensive regulating tank 43 enters the anaerobic tank 44 for anaerobic reaction. In a preferred embodiment, an SS value detection device is disposed in the second cooling water tank 42, and a first bypass pipe is further connected to a connection pipeline between the second cooling water tank 42 and the comprehensive regulation tank 43, and the first bypass pipe is connected to the comprehensive regulation tank 43 through a flocculation tank 421. The flocculation tank 421 is provided with a wastewater flocculation precipitation device and a matched dosing device, a bypass control valve is arranged on the first bypass pipe, and when the SS value of the water in the second cooling water tank 42 is detected to be higher and exceeds a set value, the wastewater in the second cooling water tank 42 enters the flocculation tank 421 through the bypass control valve to be subjected to flocculation precipitation treatment so as to remove suspended matters in the water body and reduce the SS value content in the water body; when the SS of the water in the second cooling water tank 42 is lower than the set value, the wastewater in the second cooling water tank 42 directly enters the comprehensive adjusting tank 43 for treatment without flocculation and precipitation, thereby improving the treatment efficiency of the wastewater. A steam heating pipe and a temperature detection and control device are arranged in the comprehensive adjusting tank 43.
After the pH value and the COD of the inlet water are regulated in the comprehensive regulating tank 43, the wastewater enters the anaerobic tank 44 for anaerobic treatment, and organic matters in the water body are degraded under the treatment of anaerobic bacteria, so that the content of the COD in the water body is reduced. The anaerobic tank 44 includes a plurality of anaerobic reactors and a second switching tube set for controlling at least a portion of the plurality of anaerobic reactors connected in parallel or in series into a water circuit.
For example, the water outlet of the comprehensive adjusting tank 43 is connected to a second total water outlet pipe, a second branch water pipe is arranged between the second total water outlet pipe and each anaerobic reactor, the water inlet of the aerobic tank 45 is connected to a second total water inlet pipe, a second branch water inlet pipe is arranged between the second total water inlet pipe and each anaerobic reactor, and the outlet of the left-side anaerobic reactor in the adjacent anaerobic reactors is further connected to the inlet of the right-side anaerobic reactor through a second series branch. Therefore, the anaerobic reactor is adaptively adjusted and used according to the change of the quality and the quantity of the wastewater, and the anaerobic treatment effect and the treatment efficiency are maximized.
The anaerobic reactor is provided with a heating coil and a heat preservation layer, and the outer wall of the anaerobic reactor is provided with a temperature detection and control device which can heat and control the anaerobic reactor to ensure that the temperature in the anaerobic reactor is at the optimal anaerobic treatment temperature. The top of the anaerobic reactor is provided with an anaerobic gas collecting and treating device, which ensures that the gas generated by the anaerobic treatment of the wastewater is discharged after being treated in an environment-friendly way.
Further preferably, a second by-pass pipe is connected to the connection pipeline between the anaerobic tank 44 and the aerobic tank 45, and the second by-pass pipe is connected to the aerobic tank 45 through a facultative tank 441. The wastewater can be treated by the anaerobic reactor, then enters the facultative tank 441 through the second by-pass pipe for treatment, and then automatically flows into the aerobic tank 45 through the facultative tank 441. When the waste water causes the total nitrogen to exceed the standard because of the fluctuation of the water quality, can pass through the control of second bypass pipe, get into facultative tank 441 by the anaerobism pond 44 earlier and get into aerobic tank 45, be favorable to realizing the process of nitrifying and denitrifying wastewater treatment desorption total nitrogen pollutant, when total nitrogen content is not high in the waste water quality, can realize not directly getting into aerobic tank 45 by anaerobism pond 44 through the second bypass pipe and get rid of the effect of organic matter (COD) and getting rid of pollutants such as ammonia nitrogen, thereby realize the nimble treatment waste water according to waste water total nitrogen water quality condition.
The wastewater treated by the anaerobic reactor automatically flows into the aerobic tank 45 through a pipeline, and the wastewater is subjected to aerobic treatment under the action of aerobic bacteria in the aerobic tank 45, so that the COD content in the water body is further reduced. The bottom of the aerobic tank 45 is provided with an aeration pipe, the aeration pipe is connected with a Roots blower of a blower room through a pipeline, and the aeration treatment is carried out on the wastewater in the aerobic tank 45. 45 pond walls in good oxygen pond are equipped with heating coil and heat preservation, are equipped with temperature-detecting and controlling means on the outer wall, can heat and temperature control to the pond water.
The effluent of the aerobic tank 45 automatically flows into the sedimentation tank 46 through a pipeline, and the inside of the tank is paved with filler, so that the sedimentation speed of the aerobic effluent can be improved, and the sedimentation effect and efficiency can be improved. The sedimentation tank 46 is preferably an inclined tube sedimentation tank, and the supernatant water at the upper part of the inclined tube sedimentation tank 46 automatically flows into the transfer tank 47. The transfer tank 47 is connected with the sand filter 48 through a pipeline, and finally is discharged after reaching the standard after being monitored by an online monitoring facility through a discharge pipe. Preferably, a water quality detection device is arranged in the transfer tank 47, a fourth bypass pipe is arranged on a connecting pipeline between the transfer tank 47 and the sand filter 48, and the fourth bypass pipe is connected with a water inlet of the aerobic tank 45 through a pipeline pump. When the water in the transit tank 47 does not meet the treatment process requirements through detection, the wastewater in the transit tank 47 can flow back to the aerobic tank 45 through the fourth bypass pipe to continue the circulation treatment. Preferably, a third by-pass pipe is further connected to a connecting pipeline between the sludge bucket of the sedimentation tank 46 and the sludge concentration tank 49, the third by-pass pipe is connected to the aerobic tank 45, sediment at the bottom of the inclined tube sedimentation tank 46 can be pumped to the aerobic tank 45 through the third by-pass pipe to supplement aerobic sludge loss according to needs, when the aerobic sludge loss does not need to be supplemented, the sediment is pumped to the sludge concentration tank 49 and is subjected to filter pressing and reduction treatment periodically, and the generated sludge solid waste is subjected to harmless treatment by qualified units.
In conclusion, the wastewater treatment system that this application provided can realize the multistage classification processing to organic matter in the waste water, rich salt residue to and the tertiary cooling treatment to the temperature to through bypass pipeline, surpass the pipeline and carry out branch's processing to waste water, thereby realize the targeted system processing to high temperature, high salt, high COD content fine chemistry industry waste water.
The classification treatment of the organic matters in the wastewater specifically comprises the following steps:
primary treatment: the triple effect evaporator 1 can remove the organic matters in the wastewater to 90%;
secondary treatment: the concentration kettle 21 is used for vacuum concentration treatment, and the removal rate of organic matters in the wastewater can reach 95 percent;
and (3) tertiary treatment: the comprehensive adjusting tank 43 and the flocculation tank 421 are used for adjusting and treating organic matters (COD), and the removal rate of the organic matters in the wastewater can reach 98 percent;
four-stage treatment: biochemical treatment (1), the removal rate of organic matters in the wastewater can reach 99.9% by combining the anaerobic tank 44, the facultative tank 441 and the aerobic tank 45 with a bypass pipeline;
biochemical treatment (2), the inclined tube sedimentation tank 46 can realize short-range two-stage AO treatment by combining a bypass pipeline and an overtaking pipeline, further reduces the content of organic matters in the wastewater, has the function of further removing nitrogen and phosphorus, can be flexibly selected and controlled according to different water quality conditions, and meets the treatment requirements of different water qualities.
Taking the COD in the initial wastewater as 10 ten thousand mg/L as an example, the COD can be reduced to 1 ten thousand mg/L after primary treatment, 5000mg/L after secondary treatment, 2000mg/L after tertiary treatment, less than 100mg/L after biochemical treatment (1), and less than 50mg/L after biochemical treatment (2).
The grading treatment of the salt-rich residues in the wastewater specifically comprises the following steps:
primary treatment: treating by a triple effect evaporator 1;
secondary treatment: vacuum concentration treatment is carried out on the concentration kettle 21;
and (3) tertiary treatment: and drying treatment, including centrifuge 22 dehydration drying and tray dryer 23 drying.
Carrying out three-stage cooling treatment on water temperature:
primary cooling treatment: the first cooling water pool 51 performs heat exchange and temperature reduction, and meanwhile, heat recovery is realized;
secondary cooling treatment: the cooling water tower 41 is cooled and is automatically controlled in series-parallel connection;
and (3) carrying out third-level cooling treatment: the second cooling water tank 42 is cooled down in a baffled manner.
Further preferably, as shown in fig. 4, the stirring blade 100 is provided on a portion of the drive shaft 461 of the sludge scraping mechanism of the sedimentation basin 46 in the sludge bucket, the stirring blade 100 includes a first stirring portion 101 and a second stirring portion 102 which are disposed at an angle in a horizontal plane, the second stirring portion 102 rotates by a predetermined angle relative to the first stirring portion 101 in the rotation direction of the drive shaft, an intersection line of the first stirring portion 101 and the second stirring portion 102 is inclined in a direction approaching the drive shaft from top to bottom, the first stirring portion 101 is disposed closer to the drive shaft than the second stirring portion 102, and the first stirring portion 101 and the second stirring portion 102 are inclined in a direction opposite to the rotation direction of the drive shaft from top to bottom. The outer border of second stirring portion 102 includes border portion 1021 and lower border portion 1022, and border portion 1021 from top to bottom inclines to the direction of keeping away from the drive shaft, and lower border portion 1022 from top to bottom inclines to the direction that is close to the drive shaft, so set up can make the mud in the sludge bucket enough turn about can rotate again to guarantee the effect of turning of the mud in the sludge bucket, avoid mud to take place to block up and be difficult to discharge in the sludge bucket.
By the method, high-salinity, high-temperature and high-COD fine chemical wastewater can be treated, the treated effluent reaches the first-class A standard (GB18918-2002) of pollutant emission of urban sewage treatment plants, the COD of the effluent reaches below 50mg/L, the SS value is below 10mg/L, the ammonia nitrogen value is below 5mg/L, and the pH value is 6-9.
Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A wastewater treatment system is used for treating high-salt high-temperature fine chemical wastewater and is characterized by comprising a triple-effect evaporator, a salt-rich residue treatment equipment group, an organic matter treatment equipment group and a distilled condensate water treatment equipment group which are connected with the triple-effect evaporator, and a heat recovery equipment group, wherein the heat recovery equipment group comprises a first cooling water tank, a circulating water tank and a steam boiler, the first cooling water tank is communicated with a distilled condensate water outlet of the triple-effect evaporator, a plate-type heat exchanger is arranged in the first cooling water tank, a heat exchange flow channel in the plate-type heat exchanger is communicated with the circulating water tank to form a heat exchange flow path, a fluid driving device is arranged on the heat exchange flow path, the circulating water tank is also connected with the steam boiler, and steam generated by the steam boiler is used for being provided to the salt-rich residue treatment equipment group and the distilled condensate water treatment equipment group, and the water outlet of the first cooling water tank is communicated with the distilled condensed water treatment equipment group.
2. The wastewater treatment system of claim 1, wherein a plurality of baffles are arranged in the first cooling water pool, the baffles divide the space of the first cooling water pool into a circuitous water flow channel, and a plurality of plate heat exchangers are arranged in the water flow channel at intervals.
3. The wastewater treatment system of claim 1, wherein the salt-rich residue treatment plant includes a thickening tank, a centrifuge, a tray dryer, and an activated carbon canister, wherein a residual organic outlet of the thickening tank is in communication with the organic treatment plant, a residue discharge outlet of the thickening tank is in communication with an inlet of the centrifuge, a liquid outlet of the centrifuge is in communication with the first cooling water tank, a solids outlet is in communication with an inlet of the tray dryer, and a gas outlet of the tray dryer is in communication with the activated carbon canister.
4. The wastewater treatment system according to claim 1, wherein the distillation condensate water treatment equipment group comprises a cooling water tower, a second cooling water tank, a comprehensive adjusting tank, an anaerobic tank, an aerobic tank and a sedimentation tank which are connected in sequence, a clear water zone of the sedimentation tank is communicated with a sand filter tank through a transfer tank, a sludge hopper of the sedimentation tank is communicated with a sludge concentration tank, the cooling water tower is communicated with a water outlet of the first cooling water tank, and the comprehensive adjusting tank is used for adjusting the pH value, the water temperature and the chemical oxygen demand of wastewater.
5. The wastewater treatment system according to claim 4, wherein an SS value detection device is provided in the second cooling water tank, and a first bypass pipe is further connected to a connection pipe between the second cooling water tank and the comprehensive regulation tank, and the first bypass pipe is connected to the comprehensive regulation tank through a flocculation tank.
6. The wastewater treatment system of claim 4, wherein a second by-pass pipe is further connected to the connection pipe between the anaerobic tank and the aerobic tank, and the second by-pass pipe is connected to the aerobic tank through a facultative tank.
7. The wastewater treatment system according to claim 4, wherein a third bypass pipe is further connected to a connecting pipeline between the sludge hopper of the sedimentation basin and the sludge concentration basin, and the third bypass pipe is connected to the aerobic basin.
8. The wastewater treatment system according to claim 4, wherein a water quality detection device is arranged in the transfer tank, a fourth bypass pipe is further connected to a connecting pipeline between the transfer tank and the sand filter, and the fourth bypass pipe is connected to the aerobic tank.
9. The wastewater treatment system according to any one of claims 4 to 8, wherein a first temperature sensor is disposed in the first cooling water pool, and a plurality of cooling water towers are provided, and the wastewater treatment system further comprises a first switching pipe group for controlling at least a part of the plurality of cooling water towers to be connected in parallel or in series into the water path.
10. The wastewater treatment system of any of claims 4 to 8, wherein the anaerobic tank comprises a plurality of anaerobic reactors and a second switch tube bank for controlling at least a portion of the plurality of anaerobic reactors to be coupled in parallel or in series to a water circuit.
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| CN114377702A (en) * | 2022-01-15 | 2022-04-22 | 广州绿然环保新材料科技有限公司 | Efficient sewage treatment agent and preparation method and application thereof |
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