CN219603376U - Zero release comprehensive utilization processing system of graphite purification waste water - Google Patents
Zero release comprehensive utilization processing system of graphite purification waste water Download PDFInfo
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- CN219603376U CN219603376U CN202223353408.6U CN202223353408U CN219603376U CN 219603376 U CN219603376 U CN 219603376U CN 202223353408 U CN202223353408 U CN 202223353408U CN 219603376 U CN219603376 U CN 219603376U
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Abstract
The utility model discloses a zero-emission comprehensive utilization treatment system for graphite purification wastewater, which comprises a primary coagulation tank, a secondary coagulation tank, a materialized sedimentation tank, a high-calcium denitrification system, a silicon removal and hardness removal system, a sand filtration tank, a carbon filtration tank, an ultrafiltration membrane system, an electrodialysis system and a reverse osmosis membrane system which are sequentially communicated, wherein a first dosing device, a second dosing device and a carbon source supply device respectively provide a neutralizing agent, a coagulant and a carbon source for the primary coagulation tank, the secondary coagulation tank and the high-calcium denitrification system, the silicon removal agent supply device and the hardness removal agent supply device provide silicon removal and hardness removal agents for the silicon removal and hardness removal system, a calcium mud separation device is communicated with a mud discharge port of the materialized sedimentation tank to carry out biochemical mud separation and backflow to the high-calcium denitrification system, and a recycling water tank and an evaporator are respectively communicated with an electroosmosis water discharge port and a concentrated water discharge port of the reverse osmosis membrane system.
Description
Technical Field
The utility model relates to the technical field of water treatment, in particular to a zero-emission comprehensive utilization treatment system for graphite purified wastewater.
Background
Along with the rapid burst of new energy automobile demands, the graphite negative electrode material for rapidly improving the demands of the lithium battery is prepared by taking natural crystalline flake graphite as a raw material and performing the procedures of crushing, grading, spheroidizing, purifying, surface treatment and the like. After natural graphite is extracted, the natural graphite contains more impurities, cannot be produced and utilized, and must be subjected to purification treatment. The purification process is to add spherical graphite into a reaction kettle, add HF, HCl, HNO and the like, and stir to enable acid to react with metal and non-metal impurities in the spherical graphite so as to remove the impurities. The purification process produces a large amount of acid-containing wastewater and concentrated solution, and the graphite acid-containing wastewater is mainly characterized in that: the waste water contains acid and alkali substances and a small amount of metal ions, has high concentration and complex components, belongs to a class of industrial pollutants strictly controlled by the country, and has great harm to the environment. The main pollutant treatment process in the existing natural graphite cathode purification production wastewater adopts a lime method for neutralization and two-stage precipitation for defluorination, but the wastewater still contains high-concentration nitrogen and salt, and cannot be directly discharged to a downstream sewage plant, and the discharged water quantity is controlled by the downstream sewage plant.
Disclosure of Invention
In order to make up for the defects, the utility model provides a zero-emission comprehensive utilization treatment system for graphite purification wastewater, which can realize the zero-emission treatment of the graphite purification wastewater.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a graphite purification waste water zero release comprehensive utilization processing system, including first class coagulation tank, first dosing device, second class coagulation tank, second dosing device, materialization sedimentation tank, high calcium denitrification system, carbon source supply device, calcium mud separation, desilication removes hard system, desilication medicament supply device, remove hard medicament supply device, sand filtration jar, charcoal filtration jar, milipore filter system, electrodialysis system, reverse osmosis membrane system, evaporimeter, retrieval and utilization water pitcher and sludge impoundment, first dosing device can throw neutralization medicament to the first class coagulation tank, and the delivery port of first class coagulation tank is through pipeline and the water inlet intercommunication of second class coagulation tank, and the delivery port of second class coagulation tank is through pipeline and materialization sedimentation tank's water inlet intercommunication, materialization sedimentation tank bottom is equipped with the mud mouth, the mud mouth is through pipeline and sludge impoundment intercommunication, the side wall of the upper end of the materialized sedimentation tank is provided with a water outlet, the water outlet of the materialized sedimentation tank is used for supplying wastewater to the high-calcium denitrification system through a pipeline, the carbon source supply device can be used for adding a carbon source into the high-calcium denitrification system, the carbon source and the wastewater are subjected to biochemical denitrification reaction in the high-calcium denitrification system to remove nitrate nitrogen in the wastewater, carbonate ions generated by denitrification are combined with calcium ions in the water to generate calcium carbonate, the hardness of the water is reduced, the high-calcium denitrification system is provided with a denitrification water outlet and a denitrification sludge outlet, the denitrification water outlet is communicated with a water inlet of the silicon removal and hardness removal system through a pipeline, the denitrification sludge outlet is communicated with a sludge inlet of the calcium sludge separation device through a pipeline, the calcium sludge separation device can be used for separating biochemical sludge from calcium sludge, the calcium sludge separation device can be used for refluxing the biochemical sludge into the high-calcium denitrification system through a pipeline, the calcium mud separating device can convey calcium mud to the sludge pond through a pipeline, the desilication and hardness removal system comprises a desilication reaction pond and a hardness removal reaction pond which are sequentially communicated along the flowing direction of wastewater, the desilication reagent supplying device and the hardness removal reagent supplying device can respectively add desilication reagent and hardness removal reagent to the desilication reaction pond and the hardness removal reaction pond, the tail end of the desilication and hardness removal system along the flowing direction of wastewater is also provided with a desilication hardness removal wastewater outlet and a desilication hardness removal sludge outlet, the desilication hardness removal wastewater outlet is communicated with a sand filtration tank water inlet through a pipeline, the desilication hardness removal sludge outlet is communicated with the sludge pond through a pipeline, a sand filtration tank water outlet is communicated with a carbon filtration tank water inlet through a pipeline, the carbon filtration tank is filled with activated carbon for absorbing COD in wastewater, the water outlet of the carbon filter tank is communicated with the water inlet of an ultrafiltration membrane system through a pipeline, an ultrafiltration membrane is arranged in the ultrafiltration membrane system, the ultrafiltration membrane can filter SS (suspended solids) and organic matters in the wastewater, the water outlet of the ultrafiltration membrane system can discharge ultrafiltration water filtered by the ultrafiltration membrane, the water outlet of the ultrafiltration membrane system is communicated with an electrodialysis system through a pipeline, an electrodialysis membrane capable of filtering organic matters and inorganic salts which are higher than a set standard in water is arranged in the electrodialysis system, an electroosmosis water outlet for discharging electroosmosis water filtered by the electroosmosis membrane and a concentrated water outlet for discharging concentrated water after filtration are arranged on the electrodialysis system, the concentrated water outlet is communicated with an evaporator through a pipeline, the evaporator can carry out salt analysis evaporation treatment on the residual concentrated water filtered by the electroosmosis membrane, the electroosmosis water outlet is communicated with the water inlet of the reverse osmosis membrane system, the reverse osmosis membrane system is internally provided with a reverse osmosis membrane capable of filtering residual organic matters and inorganic salts in the electroosmosis water, the reverse osmosis membrane system is provided with a reverse osmosis water outlet and a reverse osmosis concentrated water outlet, the reverse osmosis water outlet of the reverse osmosis membrane system is communicated with a recycling water tank through a pipeline, and the reverse osmosis concentrated water outlet of the reverse osmosis membrane system is communicated with a water inlet of the electrodialysis membrane device through a pipeline.
As a further improvement of the utility model, an adjusting tank is also arranged, an aerator is arranged in the adjusting tank, the aerator can perform aeration homogenization on wastewater in the adjusting tank, a water outlet of the adjusting tank is communicated with the coagulation tank through a pipeline, the ultrafiltration membrane system is also provided with an ultrafiltration concentrate outlet for discharging the residual concentrate filtered by the ultrafiltration membrane, and the ultrafiltration concentrate outlet is communicated with the adjusting tank through a pipeline.
As a further improvement of the utility model, a buffer tank is also arranged, the water inlet of the buffer tank is communicated with the water outlet of the materialized sedimentation tank through a pipeline, and the water outlet of the buffer tank is communicated with the water inlet of the high-calcium denitrification system through a pipeline.
As a further improvement of the utility model, an intermediate water tank is also arranged, the water inlet of the intermediate water tank is communicated with the silicon-removing and hardness-removing waste water outlet through a pipeline, and the water outlet of the intermediate water tank is communicated with the water inlet of the sand filter tank through a pipeline.
As a further improvement of the utility model, the system is also provided with a regulating tank lifting pump, a first sludge pump, a denitrification lifting pump, a calcium mud reflux pump, a second sludge pump, a third sludge pump, a sand filtration water inlet pump, an electrodialysis water inlet pump and a concentrated water inlet pump, wherein the regulating tank lifting pump can pump the wastewater which is homogenized in the regulating tank into the primary coagulation tank, the wastewater in the water outlet of the primary coagulation tank flows to the water inlet of the secondary coagulation tank, the wastewater in the water outlet of the secondary coagulation tank flows to the materialized sedimentation tank, the wastewater subjected to sedimentation treatment flows to the water inlet of the buffer tank, sludge in the sludge outlet of the materialized sedimentation tank is pumped into the sludge tank through the first sludge pump, the wastewater in the water outlet of the buffer tank is pumped into the high-calcium denitrification system through the denitrification lifting pump, the sludge in the denitrification sludge outlet is pumped into the calcium mud separation device through the second sludge pump, the calcium mud separation device pumps the calcium mud into the primary coagulation tank through the calcium mud reflux pump, the silicon removal hard sludge discharge port of the silicon removal system is pumped into the water outlet of the electrodialysis water inlet pump through the third sludge pump, the wastewater in the water outlet of the electrodialysis water inlet pump enters the ultrafiltration water pump through the water outlet of the ultrafiltration system, and the sludge pump enters the sand filtration water outlet of the ultrafiltration system.
As a further improvement of the utility model, a first stirrer and a pH on-line monitor are arranged in the primary coagulation tank, a second stirrer and a fluorine on-line monitor are arranged in the secondary coagulation tank, a third stirrer and a fourth stirrer are respectively arranged in the silicon removal reaction tank and the hardness removal reaction tank, and the first stirrer, the second stirrer, the third stirrer and the fourth stirrer stir the waste water in the primary coagulation tank, the secondary coagulation tank silicon removal reaction tank and the hardness removal reaction tank respectively.
As a further improvement of the utility model, the first dosing device comprises a first dosing pump and a first medicament storage tank, the first dosing pump can pump the neutralization medicament in the first medicament storage tank into the primary coagulation tank, the second dosing device comprises a second dosing pump and a second medicament storage tank, the second dosing pump can pump the coagulation medicament in the second medicament storage tank into the secondary coagulation tank, the carbon source supply device comprises a third dosing pump and a third medicament storage tank, the third dosing pump can pump the carbon source in the third medicament storage tank into the high-calcium denitrification system, the silicon removal medicament supply device comprises a fourth dosing pump and a fourth medicament storage tank, the fourth dosing pump can pump the silicon removal medicament in the fourth medicament storage tank into the silicon removal reaction tank, the hard removal medicament supply device comprises a fifth dosing pump and a fifth medicament storage tank, and the fifth dosing pump can pump the hard removal medicament in the fifth medicament storage tank into the hard removal reaction tank.
As a further improvement of the utility model, the high-calcium denitrification system comprises a denitrification reaction tank, an aerobic tank and a denitrification sedimentation tank which are sequentially communicated along the water flow direction, wherein a carbon source can be added into the denitrification reaction tank by a carbon source supply device, a fifth stirrer for stirring the carbon source and wastewater is also arranged in the denitrification reaction tank, the aerobic tank is also connected with a fan through a pipeline, the fan can supply air into the aerobic tank, and a denitrification sludge discharge port is positioned at the bottom of the lower end of the denitrification sedimentation tank.
As a further improvement of the utility model, an ultrafiltration water inlet booster pump, an ultrafiltration water inlet tank, an ultrafiltration water producing tank and a precision filter are also arranged in the ultrafiltration membrane system, the ultrafiltration water inlet tank is communicated with a water outlet of the carbon filter tank through a pipeline, the ultrafiltration water inlet booster pump can pump wastewater at the water outlet of the carbon filter tank into the precision filter at a set pressure, the water outlet of the precision filter is connected with a water inlet of the ultrafiltration membrane, the ultrafiltration water producing tank is connected with a water producing port of the ultrafiltration membrane, and the water outlet of the ultrafiltration water producing tank is communicated with a water inlet of the electrodialysis system through a pipeline;
the reverse osmosis membrane system further comprises a reverse osmosis water inlet high-pressure pump, a reverse osmosis water inlet tank, a concentrated water collecting tank and a concentrated water inlet pump, wherein the reverse osmosis water inlet tank is communicated with an electroosmosis water outlet of the electrodialysis system through a pipeline, wastewater in the reverse osmosis water inlet tank is pumped into the reverse osmosis membrane through the reverse osmosis water inlet high-pressure pump at set pressure, the concentrated water collecting tank is communicated with the reverse osmosis concentrated water outlet, the concentrated water collecting tank is communicated with the evaporator through a pipeline, and the concentrated water inlet pump can pump concentrated water in the concentrated water collecting tank into the evaporator.
As a further improvement of the utility model, the evaporator also comprises a crystallizer, a cooling water tank and a cooling water lifting pump, wherein the crystallizer can carry out salt evaporation crystallization on the wastewater entering the evaporator to form salt crystals, a steam outlet of the evaporator is communicated with the cooling water tank through a pipeline, the cooling water tank is communicated with the ultrafiltration water producing tank through a pipeline, and the cooling water lifting pump can pump the cooling water in the cooling water tank into the ultrafiltration water producing tank.
The beneficial technical effects of the utility model are as follows: according to the utility model, aiming at the water quality characteristics of the fluorine-containing and nitrogen-containing wastewater of the graphite purification wastewater, the reclaimed water recycling of the graphite purification wastewater is realized by arranging the pretreatment units such as silicon removal, fluorine removal, denitrification, multi-medium filtration, ultrafiltration, electrodialysis, reverse osmosis and the like, the water yield of the membrane system is realized by more than 90%, the water quality of the produced water meets the production line requirements of enterprises, and a large amount of water resources are saved; the biochemical hard removal unit, the chemical hard removal unit and the chemical silicon removal unit are respectively arranged, so that the scale blocking component in the water quality of the membrane concentrated inlet water is effectively reduced, the dosage of the scale inhibitor is greatly reduced, and the long-term stable operation of a membrane system is ensured; the utility model is also provided with pretreatment units such as sand filtration, carbon filtration, precise filtration and the like, so that suspended matters and organic matters in water can be effectively removed, ultrafiltration and reverse osmosis membranes can be effectively protected, and the cleaning period and the service life of the membranes can be prolonged; the utility model also provides a calcium carbonate sludge separation and recycling system, which can effectively reduce calcified sludge in the high-calcium denitrification tank and reduce the amount of lime defluorination medicament, thereby reducing the concentration of calcium and the hardness removal cost, and further reducing the running cost of the whole reclaimed water recycling system; according to the utility model, nitrate in water is removed through the denitrification process, so that the salt content is effectively reduced, the amount of salt produced by evaporation and crystallization of concentrated water is reduced, and the disposal cost outside the commission of the crystallized salt is saved.
Drawings
Fig. 1 is a schematic diagram of the structural principle of the present utility model.
Detailed Description
Examples: a zero-emission comprehensive utilization treatment system for graphite purification wastewater comprises a regulating tank 1, a primary coagulation tank 2, a secondary coagulation tank 3, a materialized sedimentation tank 4, a buffer tank 5, a high-calcium denitrification system 6, a silicon removal and hardness removal system 7, an intermediate water tank 8, a sand filtration tank 9, a carbon filtration tank 10, an ultrafiltration membrane system, an electrodialysis system 12, a reverse osmosis membrane system 13, a concentrated water collection tank 14, an evaporator 15, a recycling water tank 16, a sludge tank 17 and pipelines for connecting units.
The regulating tank 1 mainly regulates the water quantity and the water quality, homogenizes the incoming water in an aeration mode, is internally provided with a regulating tank lifting pump 101, and lifts the waste water in the regulating tank by using the regulating tank lifting pump 101 to be conveyed to the primary coagulation tank 2;
the primary coagulation tank 2 is used for neutralizing acid in the incoming water and removing fluorine in the incoming water, a first stirrer 201 and a pH on-line monitor 202 are arranged in the primary coagulation tank 2 and are respectively used for stirring wastewater in the primary coagulation tank 2 and monitoring the pH of the wastewater in the primary coagulation tank 2 in real time, a first dosing pump 203 and a first medicament storage tank 204 are arranged on one side of the primary coagulation tank,
the first medicament storage tank 204 conveys medicaments to the primary coagulation tank 2 through the first medicament adding pump 203, and wastewater in the primary coagulation tank 2 automatically flows to the secondary coagulation tank 3;
the secondary coagulation tank 3 is used for adding a coagulant to coagulate incoming water, so that the precipitation rate of sludge in the water is accelerated. The second coagulation tank 3 is also internally provided with a second stirrer 301 and a fluorine on-line monitor 302, and a second dosing pump 303 and a second medicament storage tank 304 are arranged on one side of the second coagulation tank 3. The second medicament storage tank 304 conveys medicaments to the secondary coagulation tank 3 through the second medicament adding pump 303, and wastewater in the secondary coagulation tank 3 automatically flows to the materialized sedimentation tank 4 through gravity;
the materialized sedimentation tank 4 removes sediment in water through the action of gravity, reduces SS entering the rear end in the water, still is equipped with first sludge pump 401 on the mud discharging pipeline of materialized sedimentation tank 4, and first sludge pump 401 passes through the pipeline with the mud after the sediment and carries to sludge impoundment 17. Effluent from the materialized sedimentation tank 4 automatically flows into a buffer tank 5;
the buffer tank 5 is used for adjusting the difference of the treatment flow of the front and rear systems, a denitrification lifting pump 501 is further arranged in the buffer tank 5, and raw water in the buffer tank 5 is lifted to a denitrification system 6 through the denitrification lifting pump 501;
the high-calcium denitrification 6 removes nitrate nitrogen in raw water by adding a carbon source for biochemical denitrification, and carbonate ions generated by denitrification can be combined with calcium ions in water to generate calcium carbonate, so that the hardness of the water is reduced. The high-calcium denitrification 6 comprises a denitrification tank, an aerobic tank 601, a denitrification sedimentation tank, a calcium mud separating device 602, a calcium mud reflux pump 603, a second sludge pump 604, a Roots blower 605, a third dosing pump 606 and a third medicament storage tank 607, wherein wastewater enters the aerobic tank after denitrification in the denitrification tank, wastewater is subject to aeration biochemical sedimentation in the aerobic tank, sediment in the wastewater is submerged in the denitrification sedimentation tank to form a mixture of calcium mud and biochemical mud, the mixture is sent to the calcium mud separating device 602 by the second sludge pump 604 through a pipeline for calcium mud and biochemical mud separation,
the calcium mud reflux pump 603 returns the separated calcium mud to the primary coagulation tank 2, biochemical sludge flows back to the denitrification section, residual sludge is discharged into the sludge tank 17 through valve switching, and wastewater automatically flows into the silicon and hardness removal system 7;
the silicon and hardness removal system 7 is used for removing silicon, calcium and magnesium in various forms in water, preventing silicon scale, calcium and magnesium scale formation and the like from being generated during operation of a subsequent membrane concentration unit, improving operation stability and reducing risks. The desilication and hardness removal system 7 includes a desilication reaction tank 701, a hardness removal reaction tank 702, a third agitator 703, a fourth agitator 704, a fourth dosing pump 705, a fifth dosing pump 706, a silicon removal agent storage tank 707, and a hardness removal agent storage tank 708. The silicon-removing agent storage tank 707 is conveyed into the silicon-removing reaction tank through the fourth dosing pump 705, the hard-removing agent storage tank 708 is conveyed into the hard-removing reaction tank through the fifth dosing pump 706, and the silicon-removing hard-removing system 7 drains water into the intermediate reaction tank 8;
the middle water tank 8 is a water inlet buffer tank of the sand filter tank, a sand filter water inlet pump 801 is arranged in the middle water tank 8, and wastewater is lifted to an inlet of the sand filter tank 9 through the sand filter water inlet pump 801;
the sand filter tank 9 is internally provided with high-quality quartz sand with various particle sizes, so that suspended matters in incoming water can be effectively filtered, and the outlet of the sand filter tank 9 is connected with the inlet of the carbon filter tank 10;
the inside of the carbon filter tank 10 is high-quality coconut shell activated carbon, so that COD in incoming water can be further reduced, the use of a membrane is effectively protected, the service life of the membrane is prolonged, and the effluent of the carbon filter tank is connected to an ultrafiltration membrane system;
the ultrafiltration membrane system further removes SS and organic matters in water through ultrafiltration membrane filtration, and comprises an ultrafiltration water inlet booster pump 1101, an ultrafiltration water inlet tank 1102, an ultrafiltration membrane, an ultrafiltration water production tank 1103 and a precision filter 1104. The ultrafiltration water inlet tank 1102 is connected with the water outlet of the carbon filter tank 10, the wastewater is pumped into the precise filter 1104 through the ultrafiltration water inlet booster pump 1101, the water outlet of the precise filter 1104 is connected with the water inlet end of the ultrafiltration membrane 11, the ultrafiltration water producing tank 1103 is connected with the water producing port of the ultrafiltration membrane 11 after the wastewater is filtered by the ultrafiltration membrane 11, and the concentrated water port of the ultrafiltration membrane 11 is connected to the regulating tank 1 through a pipeline;
the electrodialysis system is used for removing most of organic matters, inorganic salts and the like in water, the electrodialysis system comprises an electrodialysis membrane 12 and an electrodialysis water inlet pump 1201, the electrodialysis water inlet pump 1201 is connected with an ultrafiltration water production tank 1103, the wastewater after electrodialysis enters a concentrated water collection tank 14, and the produced water enters a reverse osmosis water inlet tank 1302;
the reverse osmosis membrane system is used for further removing organic matters, inorganic salts and the like in water, and comprises a reverse osmosis membrane 13, a reverse osmosis water inlet high-pressure pump 1301 and a reverse osmosis water inlet tank 1302, wherein the reverse osmosis produced water is pumped into the reverse osmosis membrane 13 through the water outlet of the reverse osmosis water inlet high-pressure pump 1301, the reverse osmosis produced water is connected with a recycling water tank 16 through a pipeline, and the reverse osmosis concentrated water directly flows back to the ultrafiltration produced water tank 1103;
the concentrated water collecting tank 14 is an electrodialysis concentrated water outlet collecting tank, and has higher salt content;
the evaporator 15 is used for evaporating and crystallizing the salt in the electrodialysis concentrated water into salt, thoroughly solving the problem of sewage discharge, forming a closed loop for recycling the sewage, and comprises a concentrated water inlet pump 1501, a crystallizer 1502, a cooling water tank 1503 and a cooling water lifting pump 1504, wherein the cooling water is lifted to an ultrafiltration water producing tank 1103 by the cooling water lifting pump 1504, and the salt after cooling and crystallization is subjected to outsourcing treatment;
the reuse water tank 16 is used for collecting reverse osmosis produced water, and is also provided with a reuse water pump 1601, and the reuse water pump 1601 conveys the reuse water to a water use end through a pipeline;
the sludge collecting tank 17 is used for collecting sludge generated by the materialized sedimentation tank 4, the high-calcium denitrification system 6 and the silicon-removing and hard-removing system 7, and the sludge collecting tank 17 is connected with sludge discharge ports of the materialized sedimentation tank 4, the high-calcium denitrification system 6 and the silicon-removing and hard-removing system 7.
The working principle of the utility model is as follows:
raw water from an enterprise production line automatically flows into the regulating tank 1 through a pipeline, wastewater is conveyed into the primary coagulation tank 2 through the regulating tank lifting pump 101, incoming water is stirred in the tank by the first stirrer 201 and reacts with a neutralizing agent, and because the water entering the primary coagulation tank is acidic wastewater, the pH of the wastewater is monitored by the pH on-line monitor 202, and then the starting and stopping of the first dosing pump 203 are controlled, so that the agent in the first agent storage tank 204 is conveyed into the primary flocculation tank. The reaction effluent flows into a secondary flocculation tank 3, a fluorine on-line monitor 302 is arranged in the secondary flocculation tank, the start and stop of a second dosing pump 303 is controlled by monitoring fluorine, a coagulant in a second reagent storage tank 304 is conveyed into the secondary flocculation tank, and the secondary flocculation tank is stirred by a second stirrer 301 to enable wastewater to react with reagents. The wastewater after the reaction enters a materialized sedimentation tank 4, the settled sludge is discharged into a sludge tank 17 through a first sludge pump 401, and the supernatant flows into a buffer tank 5 automatically through a pipeline. The wastewater in the buffer tank 5 is lifted to the high-calcium denitrification system 6 by the denitrification lifting pump 501, and the agent in the carbon source storage tank 607 is added in the denitrification tank by the third dosing pump 606, so that the nitrate in the water is converted into nitrogen by utilizing the microbial denitrification reaction, carbonate ions are generated in the process, and calcium carbonate is generated by combining with calcium in the water. Excess carbon source is removed in an aerobic tank 601, oxygen is provided by aeration of the aerobic tank through a Roots blower 605, mud and water in the tank are fully and uniformly mixed, generated sludge is precipitated and separated by a calcium mud separating device 602, and part of calcium carbonate mud returns to a primary coagulation tank 2 through a calcium mud reflux pump 603, so that dosing of the primary coagulation tank is saved, and the rest of sludge is discharged into a sludge tank 17 through a sludge pump 604. The supernatant fluid automatically flows into a silicon removal reaction tank 701 of a silicon removal and hardness removal system, the medicament in a silicon removal agent storage tank 708 is sent into the silicon removal reaction tank 701 through a fourth medicament adding pump 706, the silicon removal reaction is carried out by stirring by a stirrer 703, after the reaction is finished, the wastewater enters a hardness removal reaction tank 702, the medicament in the hardness removal agent storage tank 708 is sent into the hardness removal reaction tank 702 through a fifth medicament adding pump 706, the hardness removal reaction is carried out by stirring by the fifth stirrer 704, after the reaction is finished, the wastewater flows into an intermediate water tank 8, after the intermediate water tank 8 is buffered, the water passes through a sand filtration tank 9 and a carbon filtration tank 10 by a sand filtration water inlet pump 801, suspended matters in the water are trapped and removed by quartz sand, and organic matters and the like are adsorbed and removed by activated carbon. The filtered effluent enters an ultrafiltration water inlet tank 1102, wastewater is conveyed to a precise filter 1104 through an ultrafiltration water inlet booster pump 1101, after precise filtration, the effluent suspension is ensured to enter an ultrafiltration membrane 11 under the condition of extremely low water quality, the ultrafiltration membrane produced water enters an ultrafiltration water production tank 1103, and the ultrafiltration membrane concentrated water directly returns to the regulating tank 1. The ultrafiltration water in the ultrafiltration water producing tank 1103 enters the electrodialysis membrane 12 through the electrodialysis water inlet pump 1201, the salt and organic matters in the water are separated through the filtration of the electrodialysis membrane 12, the electrodialysis water enters the reverse osmosis water inlet tank 1302 through a pipeline, and the electrodialysis concentrated water enters the concentrated water collecting tank 14. The electroosmosis water is delivered to the reverse osmosis membrane 13 by a reverse osmosis high pressure pump 1301, more than 99% of salt in the water is filtered, the reverse osmosis water enters a recycling water tank 16, and the concentrated water returns to the ultrafiltration water tank 1103. The concentrated water in the concentrated water collecting tank 14 enters an evaporator through a concentrated water inlet pump 1501, condensed water is returned to the ultrafiltration water inlet tank 1102 through evaporation and condensation, and the salt crystallized by condensation is directly commissioned. The sludge collecting tank 17 is used for collecting sludge generated by the materialized sedimentation tank 4, the high-calcium denitrification system 6 and the desilication and hardness removal system 7, the sludge is directly subjected to filter pressing, and the sludge after press drying is treated outside the sludge commission.
The reclaimed water recycling treatment effect of graphite manufacturers by adopting the method is as follows:
after two-stage precipitation and biochemical denitrification and hardness removal are carried out on the wastewater from the production line of the graphite manufacturer A, the qualified produced water is finally obtained by adopting the reclaimed water recycling process system disclosed by the utility model, the concentrated water of the produced water passes through an evaporator, the condensed water flows back to the system for recycling, and the whole wastewater is recycled and is not discharged. The water quality and the water quantity of the water inlet and outlet of the reclaimed water recycling system are shown in the table 1:
TABLE 1
After two-stage precipitation and biochemical denitrification and hardness removal are carried out on the wastewater from the production line of the graphite manufacturer B, the qualified produced water is finally obtained by adopting the reclaimed water recycling process system disclosed by the utility model, the concentrated water of the produced water passes through an evaporator, the condensed water flows back to the system for recycling, and the whole wastewater is recycled and is not discharged. The water quality and the water quantity of the water inlet and outlet of the reclaimed water recycling system are shown in the table 2:
TABLE 2
After two-stage precipitation and biochemical denitrification and hardness removal are carried out on the wastewater from the production line of the graphite manufacturer C, the qualified produced water is finally obtained by adopting the reclaimed water recycling process system disclosed by the utility model, the concentrated water of the produced water passes through the evaporator, the condensed water flows back to the system for recycling, and the whole wastewater is recycled and is not discharged. The water quality and the water quantity of the water inlet and outlet of the reclaimed water recycling system are shown in the table 3:
table 3.
Claims (10)
1. A zero release comprehensive utilization processing system of graphite purification waste water, its characterized in that: comprises a primary coagulation tank, a first dosing device, a secondary coagulation tank, a second dosing device, a materialized sedimentation tank, a high-calcium denitrification system, a carbon source supply device, calcium mud separation, a silicon removal and hardness removal system, a silicon removal agent supply device, a hardness removal agent supply device, a sand filtration tank, a carbon filtration tank, an ultrafiltration membrane system, an electrodialysis system, a reverse osmosis membrane system, an evaporator, a recycling water tank and a sludge tank, wherein the first dosing device can throw neutralization agent into the primary coagulation tank, a water outlet of the primary coagulation tank is communicated with a water inlet of the secondary coagulation tank through a pipeline, the second dosing device can throw coagulant into the secondary coagulation tank, a water outlet of the secondary coagulation tank is communicated with the water inlet of the materialized sedimentation tank through a pipeline, a mud discharging port is arranged at the bottom of the materialized sedimentation tank, the mud discharging port is communicated with the sludge tank through a pipeline, a water outlet is arranged on the side wall at the upper end of the materialized sedimentation tank, the water outlet of the materialized sedimentation tank supplies wastewater to the high-calcium denitrification system through a pipeline, the carbon source supply device can add a carbon source into the high-calcium denitrification system, the carbon source and the wastewater carry out biochemical denitrification reaction in the high-calcium denitrification system to remove nitrate nitrogen in the wastewater, carbonate ions generated by denitrification are combined with calcium ions in the water to generate calcium carbonate, the hardness of the water is reduced, the high-calcium denitrification system is provided with a denitrification water outlet and a denitrification sludge outlet, the denitrification water outlet is communicated with a water inlet of the desilication and hardness removal system through a pipeline, the denitrification sludge outlet is communicated with a sludge inlet of the calcium sludge separation device through a pipeline, the calcium sludge separation device can separate biochemical sludge from calcium sludge, the calcium sludge separation device can return the biochemical sludge into the high-calcium denitrification system through a pipeline, the calcium sludge separation device can convey the calcium sludge to a sludge tank through a pipeline, the desilication and hardness removal system comprises a desilication reaction tank and a hardness removal reaction tank which are sequentially communicated along the flowing direction of wastewater, a desilication agent supply device and a hardness removal agent supply device can respectively throw desilication agent and hardness removal agent into the desilication reaction tank and the hardness removal reaction tank, the tail end of the desilication and hardness removal system along the flowing direction of wastewater is also provided with a desilication hardness removal wastewater outlet and a desilication hardness removal sludge discharge port, the desilication hardness removal wastewater outlet is communicated with a water inlet of a sand filtration tank through a pipeline, the desilication sludge discharge port is communicated with a sludge tank through a pipeline, quartz sand used for filtering suspended matters in wastewater is filled in the sand filtration tank, the water outlet of the sand filtration tank is communicated with the water inlet of a carbon filtration tank through a pipeline, the water outlet of the carbon filtration tank is communicated with the water inlet of an ultrafiltration membrane system through a pipeline, the ultrafiltration membrane system is internally provided with an ultrafiltration membrane, the ultrafiltration membrane system can be filtered by SS and organic matter in wastewater, the electrodialysis system can be discharged through the electrodialysis system is provided with a water outlet which is communicated with an inorganic salt precipitation system, the water is arranged in a reverse osmosis membrane system which is communicated with the water outlet which is arranged, the inorganic precipitation system is arranged in a high-concentration filtration system which is communicated with the water filter system which is arranged, the reverse osmosis membrane system is provided with a reverse osmosis water outlet and a reverse osmosis concentrated water outlet, the reverse osmosis water outlet of the reverse osmosis membrane system is communicated with the reuse water tank through a pipeline, and the reverse osmosis concentrated water outlet of the reverse osmosis membrane system is communicated with the water inlet of the electrodialysis membrane device through a pipeline.
2. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 1, which is characterized in that: still be equipped with the equalizing basin, be equipped with the aerator in the equalizing basin, the aerator can carry out aeration homogeneity to waste water in the equalizing basin, the delivery port in equalizing basin passes through pipeline and thoughtlessly congeals the pond intercommunication, the milipore filter system still is equipped with and supplies milipore filter to filter remaining dense water exhaust ultrafiltration dense water mouth, ultrafiltration dense water mouth passes through pipeline and equalizing basin intercommunication.
3. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 2, characterized in that: the water inlet of the buffer tank is communicated with the water outlet of the materialized sedimentation tank through a pipeline, and the water outlet of the buffer tank is communicated with the water inlet of the high-calcium denitrification system through a pipeline.
4. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 3, which is characterized in that: the water inlet of the middle water tank is communicated with the silicon-removing and hardness-removing waste water outlet through a pipeline, and the water outlet of the middle water tank is communicated with the water inlet of the sand filter tank through a pipeline.
5. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 4, which is characterized in that: still be equipped with equalizing basin elevator pump, first sludge pump, denitrification elevator pump, calcium mud reflux pump, second sludge pump, third sludge pump, sand filtration intake pump, electrodialysis intake pump and dense water intake pump, the equalizing basin elevator pump can be with the waste water pump after the equalizing in the equalizing basin go into the one-level coagulating basin, waste water flows to the water inlet of second coagulating basin in the one-level coagulating basin delivery port, waste water flows to materialization sedimentation tank in the delivery port of second coagulating basin, waste water through the sedimentation treatment flows into the water inlet of buffer tank in the outlet of materialization sedimentation tank, sludge in the sediment outlet of materialization sedimentation tank passes through in the first sludge pump was gone into the sludge basin, waste water in the buffer tank outlet passes through denitrification elevator pump and goes into high calcium mud separator, calcium mud separator passes through in the calcium mud reflux pump was gone into the one-level coagulating basin, the desilication removes hard sludge discharge port and passes through the third sludge pump in the delivery port of second sludge pump, the intermediate water pump passes through the electrodialysis pump and goes into the dense water pump and goes into the evaporation pump and go into the dense water pump in the ultrafiltration system.
6. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 1, which is characterized in that: the first stirrer, the second stirrer, the third stirrer and the fourth stirrer are respectively used for stirring wastewater in the first-stage coagulation tank, the second-stage coagulation tank, the silicon removal reaction tank and the hardness removal reaction tank.
7. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 1, which is characterized in that: the first dosing device comprises a first dosing pump and a first medicament storage tank, the first dosing pump can pump the neutralizing medicament in the first medicament storage tank into a primary coagulation pond, the second dosing device comprises a second dosing pump and a second medicament storage tank, the second dosing pump can pump the coagulating medicament in the second medicament storage tank into a secondary coagulation pond, the carbon source supply device comprises a third dosing pump and a third medicament storage tank, the third dosing pump can pump the carbon source in the third medicament storage tank into a high-calcium denitrification system, the silicon removing medicament supply device comprises a fourth dosing pump and a fourth medicament storage tank, the fourth dosing pump can pump the silicon removing medicament in the fourth medicament storage tank into a silicon removing reaction pond, the hard removing medicament supply device comprises a fifth dosing pump and a fifth medicament storage tank, and the fifth dosing pump can pump the hard removing medicament in the fifth medicament storage tank into the hard removing reaction pond.
8. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 1, which is characterized in that: the high-calcium denitrification system comprises a denitrification reaction tank, an aerobic tank and a denitrification sedimentation tank which are sequentially communicated along the water flow direction, wherein a carbon source can be added into the denitrification reaction tank by a carbon source supply device, a fifth stirrer for stirring the carbon source and wastewater is further arranged in the denitrification reaction tank, the aerobic tank is also connected with a fan through a pipeline, the fan can supply air into the aerobic tank, and a denitrification sludge discharge port is positioned at the bottom of the lower end of the denitrification sedimentation tank.
9. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 1, which is characterized in that: the ultrafiltration membrane system is internally provided with an ultrafiltration water inlet booster pump, an ultrafiltration water inlet tank, an ultrafiltration water production tank and a precision filter, wherein the ultrafiltration water inlet tank is communicated with a water outlet of the carbon filter tank through a pipeline, the ultrafiltration water inlet booster pump can pump wastewater at a water outlet of the carbon filter tank into the precision filter at a set pressure, a water outlet of the precision filter is connected with a water inlet of the ultrafiltration membrane, the ultrafiltration water production tank is connected with a water production port of the ultrafiltration membrane, and a water outlet of the ultrafiltration water production tank is communicated with a water inlet of the electrodialysis system through a pipeline;
the reverse osmosis membrane system further comprises a reverse osmosis water inlet high-pressure pump, a reverse osmosis water inlet tank, a concentrated water collecting tank and a concentrated water inlet pump, wherein the reverse osmosis water inlet tank is communicated with an electroosmosis water outlet of the electrodialysis system through a pipeline, wastewater in the reverse osmosis water inlet tank is pumped into the reverse osmosis membrane through the reverse osmosis water inlet high-pressure pump at set pressure, the concentrated water collecting tank is communicated with the reverse osmosis concentrated water outlet, the concentrated water collecting tank is communicated with the evaporator through a pipeline, and the concentrated water inlet pump can pump concentrated water in the concentrated water collecting tank into the evaporator.
10. The graphite purification wastewater zero release comprehensive utilization treatment system according to claim 1, which is characterized in that: the evaporator also comprises a crystallizer, a cooling water tank and a cooling water lifting pump, wherein the crystallizer can carry out salt evaporation crystallization on wastewater entering the evaporator to form salt crystals, a steam outlet of the evaporator is communicated with the cooling water tank through a pipeline, the cooling water tank is communicated with the ultrafiltration water production tank through a pipeline, and the cooling water lifting pump can pump cooling water in the cooling water tank into the ultrafiltration water production tank.
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