CN214457412U - Processing system of flue gas deacidification waste liquid in hazardous waste incineration workshop - Google Patents
Processing system of flue gas deacidification waste liquid in hazardous waste incineration workshop Download PDFInfo
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- CN214457412U CN214457412U CN202021393538.0U CN202021393538U CN214457412U CN 214457412 U CN214457412 U CN 214457412U CN 202021393538 U CN202021393538 U CN 202021393538U CN 214457412 U CN214457412 U CN 214457412U
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Abstract
The utility model discloses a processing system of flue gas deacidification waste liquid in hazardous waste incineration workshop. The system comprises a fluoride ion removing unit for removing fluoride ions in the waste liquid in a precipitation and filtration combined mode, a metal ion removing unit for removing metal ions contained in filtrate obtained by the fluoride ion removing unit in a precipitation and filtration combined mode, and an evaporation desalting unit for desalting the filtrate obtained by the metal ion removing unit in an evaporation mode; wherein, the fluorine ion removing unit, the metal ion removing unit and the evaporation desalting unit are in butt joint through liquid pipelines, and each pipeline is provided with a conveying pump. The utility model discloses area is little after using, can effectively avoid traditional chemistry three-way box to deposit + filter the various problems that exist in the combination technology, can satisfy the requirement that the incineration plant need do the zero row and handle.
Description
Technical Field
The utility model belongs to the waste water treatment field especially relates to a processing system of hazardous waste incineration workshop flue gas deacidification waste liquid.
Background
With the progress of society in China and the development of economy, the rapid industrial development enriches the material life of people, continuously produces various convenient and novel products, and also causes the generation of a large amount of solid waste and hazardous waste. Unlike typical solid wastes, the special properties of hazardous wastes (such as flammability, corrosiveness, toxicity, etc.) are manifested in their short-term and long-term hazards. In short term, the medicine is toxic and harmful caused by ingestion, absorption by people, skin absorption and eye contact, or dangerous events such as burning, explosion and the like occur; the long-term harm includes human poisoning, carcinogenesis, teratogenicity, mutagenicity, etc. caused by repeated contact.
The incineration technology is a common method for treating the dangerous waste at present, the dangerous waste is decomposed at high temperature after the incineration treatment, germs in the dangerous waste are thoroughly eliminated, the reduction effect is good, and the land is saved. In the hazardous waste incineration treatment system, the flue gas contains a large amount of acid gas. With the increasing strictness of the flue gas emission index, the wet deacidification process is an effective guarantee means for standard emission of the incineration flue gas at present, but the wet deacidification process can generate wastewater with complex composition, and the effective treatment of the deacidification wastewater becomes one of the key points and difficulties for zero emission of the hazardous waste treatment industry. The main pollutants of the waste liquid are COD and fluorine, and simultaneously, the waste liquid contains a certain amount of soluble salt (about 3-5 percent, mainly sulfate or sulfite) and a certain alkalinity (pH value is 9-10).
Most of the current incineration plants adopt the traditional chemical three-header precipitation and filtration (combination of sand filtration, activated carbon filtration and ultrafiltration) combined process for deacidification wastewater. The deacidification wastewater treatment combined process of chemical triple-box precipitation and traditional filtration is poor in adaptability to incineration plants without outer water outlets, PAM needs to be added in the precipitation process to carry out coagulation aiding, when colloid and other suspended matters in wastewater are removed by adopting a hollow fiber ultrafiltration membrane, the ultrafiltration membrane made of PVDF can not operate under the condition of high pH (12) for a long time, the pH value of produced water is higher (12) when heavy metal and scale ions are effectively removed by adopting a coagulation precipitation mode in deacidification wastewater, partial precipitates can be dissolved by adjusting the pH value back, and the PAM added in the precipitation process easily causes great influence on the performance of the membrane.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a processing system of hazardous waste incineration workshop flue gas deacidification waste liquid, it is big to aim at solving "deposit the filtration area that exists among the traditional chemistry three-way box of current deacidification waste water deposit + the filtration (sand filtration, the combination of active carbon filtration and ultrafiltration) combined technology, pH value accommodation is narrow (PVDF hollow fiber milipore filter can't long-term operation under the high pH condition), coagulant aid PAM that the sedimentation process added easily causes great influence to the performance of membrane, milipore filter life is short, go out water unstability scheduling problem.
The utility model relates to a realize like this, a processing system of hazardous waste incineration workshop flue gas deacidification waste liquid, this system includes:
a fluoride ion removing unit for removing fluoride ions in the waste liquid in a precipitation and filtration combined mode,
a metal ion removing unit for removing metal ions contained in the filtrate obtained by the fluoride ion removing unit by precipitation-combined filtration, and
an evaporation desalting unit for desalting the filtrate obtained by the metal ion removing unit in an evaporation manner; wherein,
the fluorine ion removing unit, the metal ion removing unit and the evaporation desalting unit are in butt joint through liquid pipelines, and each pipeline is provided with a conveying pump.
Preferably, in the fluoride ion removal unit, the precipitation of fluoride ions is: adding an excess of calcium salt to the waste stream to react the calcium salt with fluoride ions in the waste stream to form a precipitate.
Preferably, in the metal ion removal unit, the metal ions include calcium ions and magnesium ions, and the metal ions are precipitated as: sodium carbonate is added to the filtrate from the fluoride ion removal unit to precipitate calcium carbonate from the calcium salt, while adjusting the pH to 9 to precipitate magnesium hydroxide from the magnesium ions.
Preferably, the fluoride ion removing unit includes: the system comprises a defluorination reaction tank for carrying out a fluorine ion precipitation reaction, a defluorination filter press for filtering a reaction product of the defluorination reaction tank, a defluorination pressure filtration pump for pumping the reaction product of the defluorination reaction tank into the defluorination filter press, and a first filtrate pool for collecting filtrate obtained by the defluorination filter press; wherein,
the top of the defluorination reaction tank is provided with a waste liquid input pipeline, the bottom of the defluorination reaction tank is provided with a reaction product output pipe, the output pipe is provided with a defluorination pressure filtration pump, the end part of the output pipe is butted with a liquid inlet of the defluorination pressure filtration machine, a filtrate output port of the defluorination pressure filtration machine is positioned right above a first filtrate pool, and the first filtrate pool is butted with a metal ion removal unit through a liquid pipeline.
Preferably, the metal ion removing unit includes: the device comprises a metal ion removing reaction tank, a metal ion removing filter press and a second filtrate pool, wherein the metal ion removing reaction tank is used for carrying out calcium ion and magnesium ion precipitation reaction; wherein,
the top of the metal ion removal reaction tank is provided with a filtrate input port, the bottom of the metal ion removal reaction tank is provided with a reaction product output pipe, the output pipe is provided with a metal ion removal filter press pump, the end part of the output pipe is in butt joint with a liquid inlet of the metal ion removal filter press, a filtrate output port of the metal ion removal filter press is positioned right above a second filtrate pool, and the second filtrate pool is in butt joint with an evaporation desalination unit through a liquid path pipeline.
The utility model overcomes the defects of the prior art and provides a deacidification waste liquid treatment system and a method, the utility model utilizes the characteristic that calcium fluoride is slightly soluble in water, excessive calcium salt is added into the waste water, and fluorine in the waste water forms calcium fluoride precipitate which is removed by filter pressing; in addition, because the salt content of the waste water is higher, the COD of the waste water exceeds standard and can not be removed by adopting a biochemical method, the utility model discloses evaporate the desalination treatment to the waste water, and in order to ensure that the evaporation treatment process avoids the rapid scaling of the evaporator, the utility model discloses further remove the calcium treatment with the waste water after defluorination, remove the calcium and use the chemical method to handle, add quantitative sodium carbonate in the waste water, make the calcium salt form calcium carbonate and precipitate, adjust pH value to 9 simultaneously, make magnesium form magnesium hydroxide and precipitate, remove through filter-pressing; the reaction equation is as follows:
Ca2++CO3 2-=CaCO3↓
Mg2++2OH-=Mg(OH)2↓
finally, the utility model discloses the waste water after removing fluorine and calcium carries out evaporation desalination, and fluorine-containing sludge removes the useless landfill of danger and deals with, and calcium-containing sludge removes the harmless processing of plasma smelting furnace, and the evaporation comdenstion water then reuses in the flue gas rapid cooling system who burns the workshop.
Compare in prior art's shortcoming and not enough, the utility model discloses following beneficial effect has:
(1) the utility model directly adopts a high-pressure filter press to carry out solid-liquid separation, thus reducing the problem of large occupied area of precipitation;
(2) the utility model adopts the process routes of defluorination, filter pressing, decalcification, filter pressing and evaporation, thereby effectively avoiding various problems in the traditional chemical three-header precipitation and filtration combined process;
(3) the utility model discloses the wet process deacidification waste water that the method can effectively handle characteristics such as utensil high salt, heavy metal, metal component are complicated various satisfies the requirement that the factory need be arranged in order to handle of burning.
Drawings
FIG. 1 is the structural schematic diagram of the system for treating flue gas deacidification waste liquid in the hazardous waste incineration plant.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, wherein fig. 1 is a schematic structural diagram of a system for treating flue gas deacidification waste liquid in a hazardous waste incineration plant of the present invention.
The utility model discloses a processing system of hazardous waste incineration workshop flue gas deacidification waste liquid, this system includes: a fluoride ion removing unit 1 for removing fluoride ions in the waste liquid by a precipitation-combined filtration method, a metal ion removing unit 2 for removing metal ions contained in the filtrate obtained by the fluoride ion removing unit 1 by the precipitation-combined filtration method, and an evaporation desalting unit 3 for desalting the filtrate obtained by the metal ion removing unit 2 by an evaporation method; the fluorine ion removing unit 1, the metal ion removing unit 2 and the evaporation desalting unit 3 are in butt joint through liquid pipelines, and a first conveying pump 4 and a second conveying pump 5 are sequentially arranged on each pipeline.
For cooperating the waste liquid input that unit 1 was got rid of to fluorinion the embodiment of the utility model provides an, more specifically, this system still includes waste liquid storage tank 6, and the waste liquid of collecting the storage in this waste liquid storage tank passes through liquid way pipeline butt joint fluorinion and gets rid of unit 1, is equipped with third delivery pump 7 on this liquid way pipeline.
The utility model discloses the technical essential of system lies in to the removal process and the mode of getting rid of relevant ion in the hazardous waste incineration workshop flue gas deacidification waste liquid, wherein, more specifically, in unit 1 is got rid of to fluorinion, the sediment of fluorinion is: adding excess calcium salt to the waste liquid to react the calcium salt with fluoride ions in the waste liquid to form a precipitate; in the metal ion removing unit 2, the metal ions include calcium ions and magnesium ions, and the precipitation of the metal ions is as follows: sodium carbonate was added to the filtrate obtained in the fluoride ion removal unit 1 to precipitate calcium carbonate as a calcium salt, while adjusting pH =9 to precipitate magnesium ions as magnesium hydroxide.
To show the specific embodiment of the system of the present invention more clearly, in the embodiment of the present invention, the fluoride ion removing unit 1 includes: the device comprises a defluorination reaction tank 1-1 for carrying out a fluorine ion precipitation reaction, a defluorination filter press 1-3 for filtering a reaction product of the defluorination reaction tank 1-1, a defluorination pressure filtration pump 1-2 for pumping the reaction product of the defluorination reaction tank 1-1 into the defluorination filter press 1-3, and a first filtrate pool 1-4 for collecting filtrate obtained by the defluorination filter press 1-3; the top of the defluorination reaction tank 1-1 is provided with a waste liquid input pipeline, the bottom of the defluorination reaction tank is provided with a reaction product output pipe, the output pipe is provided with a defluorination pressure filtration pump 1-2, the end part of the output pipe is in butt joint with a liquid inlet of the defluorination pressure filtration machine 1-3, a filtrate output port of the defluorination pressure filtration machine 1-3 is positioned right above a first filtrate pool 1-4, and the first filtrate pool 1-4 is in butt joint with a metal ion removal unit 2 through a liquid path pipeline.
Correspondingly, in the embodiment of the present invention, the metal ion removing unit 2 includes: the device comprises a metal ion removing reaction tank 2-1 for carrying out calcium ion and magnesium ion precipitation reaction, a metal ion removing filter press 2-3 for filtering a reaction product of the metal ion removing reaction tank 2-1, a metal ion removing filter press 2-2 for pumping the reaction product of the metal ion removing reaction tank 2-1 into the metal ion removing filter press 2-3, and a second filtrate pool 2-4 for collecting filtrate obtained by the metal ion removing filter press 2-3; the top of the metal ion removing reaction tank 2-1 is provided with a filtrate inlet, the bottom of the metal ion removing reaction tank is provided with a reaction product outlet pipe, the outlet pipe is provided with a metal ion removing filter press pump 2-2, the end part of the outlet pipe is in butt joint with a liquid inlet of a metal ion removing filter press 2-3, a filtrate outlet of the metal ion removing filter press 2-3 is positioned right above a second filtrate pool, and the second filtrate pool is in butt joint with an evaporation desalination unit 3 through a liquid path pipeline. Specifically, the evaporation desalination unit 3 of the present invention comprises an evaporation tank, a heating device, etc. to achieve the purpose of liquid evaporation.
The utility model discloses in the practical application process of system, the utility model discloses the concrete working process of system does:
(1) collecting the flue gas deacidification waste liquid of the hazardous waste incineration workshop in a waste liquid storage tank 6, and conveying the waste liquid into a defluorination reaction tank 1-1 in a fluoride ion removal unit 1 through a liquid path pipeline matched with a third conveying pump 7;
(2) in order to facilitate the reaction, the defluorination reaction tank 1-1 has a stirring function, the stirring function is started, excessive calcium salt is added into the defluorination reaction tank 1-1, the addition of the calcium salt is determined according to the fluorine content of the wastewater, specifically, a lime milk solution with the mass concentration of 10% is added into the wastewater according to the proportion of F: Ca =1:2.5, so that the fluorine ions form calcium fluoride precipitates, and solid calcium chloride is added to supplement the calcium ions after the pH of the wastewater reaches 9, and the reaction time is 15-20 min to generate the precipitates;
meanwhile, in order to promote the separation of the precipitate and the reaction liquid, a coagulant (PAC) and a flocculant (PAM) can be added into the defluorination reaction tank 1-1, wherein the coagulant PAC (100-200 ppm) is added for reaction for 5-10 min, and the flocculant PAM (0.5-1 per mill) is added for reaction for 5 min;
adding calcium salt, PAC, PAM and reacting in a defluorination reaction tank 1-1 for 30min, and stopping stirring after the reaction is finished;
starting a defluorination pressure filtration pump 1-2 to convey reaction products in a defluorination reaction tank 1-1 to a defluorination pressure filtration machine 1-3, wherein the defluorination pressure filtration conditions of the defluorination pressure filtration machine 1-3 are as follows: the mud feeding time is 40-60 min, the mud feeding pressure is 0.6-1.2 MPa, the squeezing time is 30-50 min, the squeezing pressure is 1.4-1.6 MPa, and the discharging time is 8-15 min;
calcium fluoride precipitate is separated from liquid by the defluorination filter press 1-3, waste liquid after filter pressing is collected in a first filtrate tank 1-4, precipitate is collected in a first sludge tank 8, and when the water content of sludge is lower than 60%, the precipitate can be stored in a sludge hopper and packed by ton bags or directly loaded on a car for outward transportation. In the embodiment of the utility model, the defluorination reaction tank 1-1 can be pumped into the defluorination filter press 1-3 without standing and precipitating after the defluorination reaction is finished, so that the treatment period can be effectively shortened, and the treatment efficiency is improved;
(3) the filtrate in the first filtrate tank 1-4 is conveyed to a metal ion removal reaction tank 2-1 through a first conveying pump 4, in order to facilitate the reaction, the metal ion removal reaction tank 2-1 has a stirring function, the stirring function is started, and according to the calcium content of the wastewater, according to the Ca: CO3 2+According to the proportion of =1:1.2 (the medicine adding proportion is verified in debugging), 10% of sodium carbonate solution is added into the wastewater, so that calcium salt forms calcium carbonate precipitate; simultaneously adjusting the pH value to 9 to ensure that magnesium forms magnesium hydroxide precipitate; the reaction time is 15-20 min;
meanwhile, in order to promote the separation of the precipitate and the reaction liquid, coagulant and flocculant (PAC, PAM) are added into the reaction liquid, wherein the coagulant PAC (100-200 ppm) is added for reaction for 5-10 min, and the flocculant PAM (0.5-1 per thousand) is added for reaction for 5 min;
adding calcium salt, PAC, PAM and reacting in a metal ion removing reaction tank 2-1 for 30min, and stopping the stirrer after the reaction;
starting the metal ion removing filter-press pump 2-2 to convey the reaction product in the metal ion removing reaction tank 2-1 to the metal ion removing filter-press 2-3, wherein the filter-press conditions are as follows: the mud feeding time is 40-60 min, the mud feeding pressure is 0.6-1.2 MPa, the squeezing time is 30-50 min, the squeezing pressure is 1.4-1.6 MPa, and the discharging time is 8-15 min;
calcium carbonate precipitate and magnesium hydroxide precipitate are separated from liquid by the metal ion filter press 2-3, the waste liquid after filter pressing is collected in a second filtrate tank, the precipitate is collected in a second sludge tank 9, and when the water content of the sludge is lower than 60%, the precipitate can be stored in a sludge hopper and packed by ton bags or directly loaded and transported. The embodiment of the utility model provides an in, remove metal ion retort 2-1 and accomplish and remove the metal ion reaction after the process that need not the precipitate of stewing can pump go into except that metal ion pressure filter 2-3, can effectually shorten processing cycle, promoted treatment effeciency.
(4) The filtrate in the second filtrate tank is conveyed to the evaporation desalting unit 3 through the second conveying pump 5 to complete the desalting treatment of the waste liquid, and calcium and magnesium ions are removed from the waste liquid, so that the problem that an evaporator is easy to scale in the evaporation desalting process can be effectively avoided.
The system of the utility model directly adopts the high-pressure filter press to carry out solid-liquid separation, reduces the problem of large occupied area of precipitation, and in addition, the system of the utility model adopts the process routes of defluorination, filter pressing, decalcification, filter pressing and evaporation, thereby effectively avoiding various problems existing in the traditional chemical three-header precipitation and filtration combined process; finally, the utility model discloses the system can effectively handle the wet process deacidification waste water that possesses characteristics such as high salt, heavy metal, metal component are complicated various, satisfies the requirement that the factory need be the zero row and handles of burning.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The utility model provides a processing system of hazardous waste incineration workshop flue gas deacidification waste liquid which characterized in that, this system includes: a fluoride ion removing unit for removing fluoride ions in the waste liquid in a precipitation-combined filtration mode, a metal ion removing unit for removing metal ions contained in the filtrate obtained by the fluoride ion removing unit in the precipitation-combined filtration mode, and an evaporation desalting unit for desalting the filtrate obtained by the metal ion removing unit in an evaporation mode; the fluorine ion removing unit, the metal ion removing unit and the evaporation desalting unit are in butt joint through liquid pipelines, and each pipeline is provided with a conveying pump.
2. The processing system of claim 1, wherein the fluoride ion removal unit comprises: the system comprises a defluorination reaction tank for carrying out a fluorine ion precipitation reaction, a defluorination filter press for filtering a reaction product of the defluorination reaction tank, a defluorination pressure filtration pump for pumping the reaction product of the defluorination reaction tank into the defluorination filter press, and a first filtrate pool for collecting filtrate obtained by the defluorination filter press; the top of the defluorination reaction tank is provided with a waste liquid input pipeline, the bottom of the defluorination reaction tank is provided with a reaction product output pipe, the output pipe is provided with a defluorination pressure filtration pump, the end part of the output pipe is in butt joint with a liquid inlet of the defluorination pressure filtration machine, a filtrate output port of the defluorination pressure filtration machine is positioned right above a first filtrate pool, and the first filtrate pool is in butt joint with a metal ion removal unit through a liquid path pipeline.
3. The processing system of claim 1, wherein the metal ion removal unit comprises: the device comprises a metal ion removing reaction tank, a metal ion removing filter press and a second filtrate pool, wherein the metal ion removing reaction tank is used for carrying out calcium ion and magnesium ion precipitation reaction; the top of the metal ion removal reaction tank is provided with a filtrate input port, the bottom of the metal ion removal reaction tank is provided with a reaction product output pipe, the output pipe is provided with a metal ion removal filter press pump, the end part of the output pipe is in butt joint with a liquid inlet of the metal ion removal filter press, a filtrate output port of the metal ion removal filter press is positioned right above a second filtrate pool, and the second filtrate pool is in butt joint with an evaporation desalination unit through a liquid path pipeline.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112194296A (en) * | 2020-07-15 | 2021-01-08 | 广州中科建禹环保有限公司 | Treatment system and method for flue gas deacidification waste liquid of hazardous waste incineration workshop |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112194296A (en) * | 2020-07-15 | 2021-01-08 | 广州中科建禹环保有限公司 | Treatment system and method for flue gas deacidification waste liquid of hazardous waste incineration workshop |
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