CN111547932A - Treatment system for removing heavy metal components from solidified fly ash leachate and use method - Google Patents
Treatment system for removing heavy metal components from solidified fly ash leachate and use method Download PDFInfo
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- CN111547932A CN111547932A CN202010244436.0A CN202010244436A CN111547932A CN 111547932 A CN111547932 A CN 111547932A CN 202010244436 A CN202010244436 A CN 202010244436A CN 111547932 A CN111547932 A CN 111547932A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
Abstract
The utility model provides a processing system that solidification flying ash leachate removes heavy metal composition, is including equalizing basin, leachate stoste MVR evaporation system and the evaporation condensate processing system that is used for adjusting the leachate, leachate stoste MVR evaporation system includes MVR evaporation crystallizer, evaporation condensate processing system includes hydrolysis unit, membrane bioreactor, ozone oxidation device and active carbon filter equipment, the process that evaporation condensate processing system adopted is for hydrolysising the comdenstion water through hydrolysis unit earlier, then reduces the C0D content and the ammonia nitrogen content of leachate through membrane bioreactor, ozone oxidation device and active carbon filter equipment.
Description
Technical Field
The invention relates to the technical field of treatment of solidified fly ash leachate, in particular to a treatment system for removing heavy metal components from solidified fly ash leachate and a using method thereof.
Background
Along with the continuous improvement of living standards of people, domestic garbage is more and more, the treatment mode of the domestic garbage comprises direct landfill and landfill after the treatment of solidified fly ash percolate generated after incineration by garbage incineration, in the prior art, the treatment method of the percolate is an anaerobic treatment method, an MBR (membrane bioreactor) and a membrane system, and the most representative processes comprise anaerobic treatment, MBR, NF (roll-up nanofiltration), RO (roll-up reverse osmosis) and anaerobic treatment, MBR and DTRO (single-stage disc-tube reverse osmosis), but the solidified fly ash generated by domestic garbage incineration is unstable due to high COD; high salinity and great difficulty in biochemical treatment; contains other heavy metals and other components, and has biochemical poisoning risk; the ammonia nitrogen and total nitrogen data are unstable, and the discharge of the solidified fly ash leachate after heavy metal treatment by the conventional treatment system is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a treatment system for removing heavy metal components from solidified fly ash leachate, which is effectively suitable for treating the solidified fly ash leachate after domestic garbage incineration to reach the standard, and a use method thereof.
The technical scheme of the invention is as follows: the utility model provides a processing system that solidification flying ash leachate removes heavy metal composition, is including equalizing basin, leachate stoste MVR evaporation system and the evaporation condensate processing system that is used for adjusting the leachate, leachate stoste MVR evaporation system includes MVR evaporation crystallizer, evaporation condensate processing system includes hydrolysis unit, membrane bioreactor, ozone oxidation device and active carbon filter equipment, the process that evaporation condensate processing system adopted is for hydrolysising the comdenstion water through hydrolysis unit earlier, then reduces the C0D content and the ammonia nitrogen content of leachate through membrane bioreactor, ozone oxidation device and active carbon filter equipment.
By adopting the technical scheme, as the leachate stock solution MVR evaporation system and the evaporation condensate treatment system are adopted, the leachate stock solution MVR evaporation system comprises an MVR evaporation crystallizer and can carry out evaporation crystallization work on the leachate stock solution, because the evaporation condensate treatment system comprises a hydrolysis device, a membrane bioreactor, an ozone oxidation device and an active carbon filtration device, and adopts the hydrolysis + MBR + ozone oxidation + active carbon filtration process, when condensed water enters the evaporation condensate treatment system, the condensed water is firstly hydrolyzed by the hydrolysis device, then the COD content and the ammonia nitrogen content can be reduced by the membrane bioreactor and the ozone oxidation device, the active carbon adsorption device can ensure that the subsequent effluent can reach the discharge standard when the water quality at the front section fluctuates, therefore, the system can be effectively suitable for treating the solidified fly ash percolate after the household garbage is burnt to reach the standard.
The invention further comprises the following steps: the percolate stock solution MVR evaporation system further comprises a pretreatment device, and sulfuric acid used for preventing the percolate stock solution MVR evaporation system from scaling is arranged in the pretreatment device.
By adopting the technical scheme, the pretreatment aims at removing easy-scaling calcium carbonate and reducing the total hardness, and scaling is prevented from being formed after entering an evaporator; the adopted principle is as follows: h2SO4 + 2Ca (HCO3)2 = 2CaCO3 ↓ + CaSO4 ↓ CO2 ↓ + 2H2O, calcium carbonate was precipitated, and a part of calcium sulfate was also precipitated.
The invention further comprises the following steps: MVR evaporative crystallizer includes forced circulation evaporimeter, comdenstion water pre-heater, salt hydroextractor, crystallization separator, discharge pump and buffer tank, the comdenstion water pre-heater is connected with the forced circulation evaporimeter, the forced circulation evaporimeter is connected with the crystallization separator, the crystallization separator is connected with the discharge pump, the discharge pump is connected with the buffer tank, the buffer tank is connected with the salt hydroextractor, the high enriched mother liquor that the salt hydroextractor produced after carrying out dehydration work to the comdenstion water flows back to the forced circulation evaporimeter.
Adopt above-mentioned technical scheme, MVR evaporative crystallizer's work flow is for letting the comdenstion water get into the comdenstion water pre-heater heating earlier, then the comdenstion water after will preheating gets into the forced circulation evaporimeter and carries out the evaporation crystallization work, then isolate the heavy metal crystallization through the crystal separation ware, rethread discharge pump is with condensation water indentation buffer tank, carry out the desalination work through the salt hydroextractor with the material in the buffer tank again, the high concentration mother liquor that the salt hydroextractor produced after carrying out the dehydration work to the comdenstion water flows back to the forced circulation evaporimeter and is reprocessed, can guarantee like this that solidification flying dust leachate discharges up to standard through the play water after current processing system heavy metal handles.
The invention further comprises the following steps: the system for treating the heavy metal components in the solidified fly ash leachate also comprises an automatic control system, wherein the automatic control system comprises an industrial personal computer, a PLC (programmable logic controller) and a plurality of signal sensors, the industrial personal computer and the PLC are respectively and electrically connected with a leachate stock solution MVR evaporation system, the signal sensors and an evaporation condensate treatment system, and the signal sensors are respectively connected to components in the leachate stock solution MVR evaporation system and the evaporation condensate treatment system and used for collecting the operation parameters of the components in the treatment system for removing the heavy metal components in the solidified fly ash leachate.
By adopting the technical scheme, the real-time monitoring center of the MVR evaporation system is formed by the industrial personal computer and the PLC. The signal sensor is used for acquiring the operating parameters of various components in real time, so that accurate control is realized. Such as the rotation speed of a motor (pump, etc.), the opening and closing and regulation of valves (pneumatic, electric, etc.), the control and regulation of the flow rate, temperature and pressure of fluid, etc., so that the system works to reach a dynamic balance state, which is the key of the design of an MVR evaporation system, and the stable work of the system depends on the precise control of an automatic control system
The invention further comprises the following steps: the treatment system for removing heavy metal components from the solidified fly ash leachate also comprises a heat source treatment system, wherein the heat source treatment system comprises a steam compressor, a forced circulation heater, a heat exchanger and a forced circulation evaporator, and the steam compressor is respectively connected with the forced circulation heater, the heat exchanger and the forced circulation evaporator.
Adopt above-mentioned technical scheme, go into the forced circulation heater through vapor compressor with vapor compression, the rethread forced circulation heater carries out the circulation heating to steam, and the rethread forced circulation evaporimeter carries out separation work to secondary steam, compresses into the heat exchanger with secondary steam through vapor compressor again and carries out the heat transfer, plays the overheated problem of in-process equipment that prevents this system work.
The use method of the treatment system for removing heavy metal components in the solidified fly ash percolate comprises the following steps: s1, pumping the percolate stock solution into a percolate stock solution MVR evaporation system through a lift pump; s2, pretreating the front section of the leachate stock solution by a pretreatment device, wherein the pretreatment process comprises the steps of firstly adding sulfuric acid into the leachate stock solution to adjust the pH value to 5-6; and S3, performing a desalination process in the MVR evaporation crystallizer to evaporate condensed water and a mixed solution of high-salt and high-concentration mother liquor.
By adopting the technical scheme, after the treatment by the process, the stable data of COD content, salt content, ammonia nitrogen content and total nitrogen content can be ensured, and the effluent after the subsequent treatment of the solidified fly ash leachate of the solidified fly ash landfill can reach the discharge standard.
The invention further comprises the following steps: the speed of the percolate stock solution pumped into the percolate stock solution MVR evaporation system through the lift pump is 2 tons/hour, the water yield of condensed water of the MVR evaporation crystallizer is 1.8 tons/hour, the discharge amount of a mixed solution of high salt and high-concentration mother solution is 200 kg/hour-220 kg/hour, after the mixed solution is treated by the membrane bioreactor, the ozone oxidation device and the active carbon filtering device, the content of C0D in the condensed water is less than 100ppm, and the content of ammonia nitrogen is less than 25 ppm.
By adopting the technical scheme, after the leachate treatment process is added, the problems of high salinity, high COD (1500-.
The invention further comprises the following steps: the method also comprises a heat source treatment process, wherein the heat source treatment process comprises the following steps: s1, compressing the vapor pressure into the forced circulation heater by the vapor compressor for preheating; s2, preheating to generate secondary steam, and separating the secondary steam by a forced circulation evaporator; and S3, compressing the separated secondary steam into a heat exchanger through a steam compressor to perform heat exchange work.
By adopting the technical scheme, after the heat source treatment process is carried out by the heat source treatment system, the problem of overheating of equipment in the working process of the system can be effectively prevented.
Drawings
FIG. 1 is a flow chart of a treatment system for removing heavy metal components from a solidified fly ash leachate according to an embodiment of the present invention.
Fig. 2 is a process flow diagram of a leachate stock solution MVR evaporative crystallization system in a treatment system for removing heavy metal components from a solidified fly ash leachate and a use method according to an embodiment of the present invention.
FIG. 3 is a process flow diagram of a heat source treatment system in the treatment system and the use method for removing heavy metal components from the solidified fly ash leachate according to the embodiment of the invention.
Detailed Description
As shown in fig. 1-3, a treatment system for removing heavy metal components from a solidified fly ash leachate comprises a regulating reservoir for regulating the leachate, a leachate stock solution MVR evaporation system and an evaporation condensate treatment system, wherein the leachate stock solution MVR evaporation system comprises an MVR evaporation crystallizer, the evaporation condensate treatment system comprises a hydrolysis device, a membrane bioreactor, an ozone oxidation device and an active carbon filtration device, and the evaporation condensate treatment system adopts a process that condensed water is hydrolyzed by the hydrolysis device, and then the content of C0D and the content of ammonia nitrogen in the leachate are reduced by the membrane bioreactor, the ozone oxidation device and the active carbon filtration device.
Because leachate stoste MVR evaporation system and evaporation condensate processing system have been adopted, leachate stoste MVR evaporation system includes MVR evaporation crystallizer and can carry out the evaporation crystallization work to leachate stoste, because evaporation condensate processing system includes hydrolysis unit, membrane bioreactor, ozone oxidation device and active carbon filter equipment, adopt and hydrolyze + MBR + ozone oxidation + active carbon filtration technology, after the comdenstion water gets into evaporation condensate processing system, at first hydrolyze through hydrolysis unit, then can reach the purpose that reduces COD content and ammonia nitrogen content through membrane bioreactor and ozone oxidation unit, can guarantee that follow-up water can reach emission standard when anterior segment quality of water fluctuates through active carbon adsorption device, therefore this system can be effectively applicable to and makes domestic waste burn the postcure flying dust treatment up to standard.
The percolate stock solution MVR evaporation system further comprises a pretreatment device, and sulfuric acid used for preventing the percolate stock solution MVR evaporation system from scaling is arranged in the pretreatment device.
The pretreatment is adopted for removing calcium carbonate easy to scale and reducing the total hardness, and scale formation after entering an evaporator is prevented; the adopted principle is as follows: h2SO4 + 2Ca (HCO3)2 = 2CaCO3 ↓ + CaSO4 ↓ CO2 ↓ + 2H2O, calcium carbonate was precipitated, and a part of calcium sulfate was also precipitated.
MVR evaporative crystallizer includes forced circulation evaporimeter, comdenstion water pre-heater, salt hydroextractor, crystallization separator, discharge pump and buffer tank, the comdenstion water pre-heater is connected with the forced circulation evaporimeter, the forced circulation evaporimeter is connected with the crystallization separator, the crystallization separator is connected with the discharge pump, the discharge pump is connected with the buffer tank, the buffer tank is connected with the salt hydroextractor, the high enriched mother liquor that the salt hydroextractor produced after carrying out dehydration work to the comdenstion water flows back to the forced circulation evaporimeter.
MVR evaporative crystallizer's work flow gets into the comdenstion water pre-heater heating for letting the comdenstion water earlier, then the comdenstion water after will preheating gets into the forced circulation evaporimeter and carries out the evaporation crystallization work, then isolate the heavy metal crystallization through the crystallization separator, rethread discharge pump is with condensation water pressure indentation buffer tank, the material in the buffer tank carries out the desalination work through the salt hydroextractor again, the salt hydroextractor carries out the high-concentration mother liquor that produces behind the dehydration work to the comdenstion water and flows back to the forced circulation evaporimeter and reprocess, can guarantee like this that solidification flying dust leachate discharges up to standard through the play water after current processing system heavy metal handles.
The system for treating the heavy metal components in the solidified fly ash leachate also comprises an automatic control system, wherein the automatic control system comprises an industrial personal computer, a PLC (programmable logic controller) and a plurality of signal sensors, the industrial personal computer and the PLC are respectively and electrically connected with a leachate stock solution MVR evaporation system, the signal sensors and an evaporation condensate treatment system, and the signal sensors are respectively connected to components in the leachate stock solution MVR evaporation system and the evaporation condensate treatment system and used for collecting the operation parameters of the components in the treatment system for removing the heavy metal components in the solidified fly ash leachate.
And a real-time monitoring center of the MVR evaporation system is formed by the industrial personal computer and the PLC. The signal sensor is used for acquiring the operating parameters of various components in real time, so that accurate control is realized. Such as the rotation speed of a motor (pump, etc.), the opening and closing and regulation of valves (pneumatic, electric, etc.), the control and regulation of the flow rate, temperature and pressure of fluid, etc., so that the system works to reach a dynamic balance state, which is the key of the design of an MVR evaporation system, and the stable work of the system depends on the precise control of an automatic control system
The treatment system for removing heavy metal components from the solidified fly ash leachate also comprises a heat source treatment system, wherein the heat source treatment system comprises a steam compressor, a forced circulation heater, a heat exchanger and a forced circulation evaporator, and the steam compressor is respectively connected with the forced circulation heater, the heat exchanger and the forced circulation evaporator.
Go into the forced circulation heater through vapor compressor with vapor compression, the rethread forced circulation heater carries out circulation heating to steam, and the rethread forced circulation evaporimeter carries out separation work to the flash steam, compresses into the heat exchanger with the flash steam through vapor compressor again and carries out the heat transfer, plays the overheated problem of in-process equipment that prevents this system work.
The use method of the treatment system for removing heavy metal components in the solidified fly ash percolate comprises the following steps: s1, pumping the percolate stock solution into a percolate stock solution MVR evaporation system through a lift pump; s2, pretreating the front section of the leachate stock solution by a pretreatment device, wherein the pretreatment process comprises the steps of firstly adding sulfuric acid into the leachate stock solution to adjust the pH value to 5-6; and S3, performing a desalination process in the MVR evaporation crystallizer to evaporate condensed water and a mixed solution of high-salt and high-concentration mother liquor.
After the treatment by the process, the stable data of COD content, salt content, ammonia nitrogen content and total nitrogen content can be ensured, and the effluent of the solidified fly ash leachate of the solidified fly ash landfill after the subsequent treatment can reach the discharge standard.
The speed of the percolate stock solution pumped into the percolate stock solution MVR evaporation system through the lift pump is 2 tons/hour, the water yield of condensed water of the MVR evaporation crystallizer is 1.8 tons/hour, the discharge amount of a mixed solution of high salt and high-concentration mother solution is 200 kg/hour-220 kg/hour, after the mixed solution is treated by the membrane bioreactor, the ozone oxidation device and the active carbon filtering device, the content of C0D in the condensed water is less than 100ppm, and the content of ammonia nitrogen is less than 25 ppm.
After the leachate treatment process is added, the problems of high salinity, high COD (1500-.
The method also comprises a heat source treatment process, wherein the heat source treatment process comprises the following steps: s1, compressing the vapor pressure into the forced circulation heater by the vapor compressor for preheating; s2, preheating to generate secondary steam, and separating the secondary steam by a forced circulation evaporator; and S3, compressing the separated secondary steam into a heat exchanger through a steam compressor to perform heat exchange work.
After the heat source treatment process is carried out by the heat source treatment system, the problem of overheating of equipment in the working process of the system can be effectively prevented.
Claims (8)
1. The utility model provides a processing system that solidification flying ash leachate removes heavy metal composition which characterized in that: including equalizing basin, leachate stoste MVR evaporation system and the evaporation condensate processing system that is used for adjusting the leachate, leachate stoste MVR evaporation system includes MVR evaporation crystallizer, evaporation condensate processing system includes hydrolysis unit, membrane bioreactor, ozone oxidation device and active carbon filter equipment, the technology that evaporation condensate processing system adopted is for hydrolysising the comdenstion water through hydrolysis unit earlier, then reduces C0D content and the ammonia nitrogen content of leachate through membrane bioreactor, ozone oxidation device and active carbon filter equipment.
2. The system for removing heavy metal components from a solidified fly ash leachate according to claim 1, wherein the system comprises: the percolate stock solution MVR evaporation system further comprises a pretreatment device, and sulfuric acid used for preventing the percolate stock solution MVR evaporation system from scaling is arranged in the pretreatment device.
3. The system for removing heavy metal components from a solidified fly ash leachate according to claim 1, wherein the system comprises: MVR evaporative crystallizer includes forced circulation evaporimeter, comdenstion water pre-heater, salt hydroextractor, crystallization separator, discharge pump and buffer tank, the comdenstion water pre-heater is connected with the forced circulation evaporimeter, the forced circulation evaporimeter is connected with the crystallization separator, the crystallization separator is connected with the discharge pump, the discharge pump is connected with the buffer tank, the buffer tank is connected with the salt hydroextractor, the high enriched mother liquor that the salt hydroextractor produced after carrying out dehydration work to the comdenstion water flows back to the forced circulation evaporimeter.
4. The system for removing heavy metal components from a solidified fly ash leachate according to claim 1, wherein the system comprises: the system for treating the heavy metal components in the solidified fly ash leachate also comprises an automatic control system, wherein the automatic control system comprises an industrial personal computer, a PLC (programmable logic controller) and a plurality of signal sensors, the industrial personal computer and the PLC are respectively and electrically connected with a leachate stock solution MVR evaporation system, the signal sensors and an evaporation condensate treatment system, and the signal sensors are respectively connected to components in the leachate stock solution MVR evaporation system and the evaporation condensate treatment system and used for collecting the operation parameters of the components in the treatment system for removing the heavy metal components in the solidified fly ash leachate.
5. The system for removing heavy metal components from a solidified fly ash leachate according to claim 1, wherein the system comprises: the treatment system for removing heavy metal components from the solidified fly ash leachate also comprises a heat source treatment system, wherein the heat source treatment system comprises a steam compressor, a forced circulation heater, a heat exchanger and a forced circulation evaporator, and the steam compressor is respectively connected with the forced circulation heater, the heat exchanger and the forced circulation evaporator.
6. The use method of the treatment system for removing heavy metal components in the solidified fly ash leachate is characterized by comprising the following steps: the method comprises the following steps: s1, pumping the percolate stock solution into a percolate stock solution MVR evaporation system through a lift pump; s2, pretreating the front section of the leachate stock solution by a pretreatment device, wherein the pretreatment process comprises the steps of firstly adding sulfuric acid into the leachate stock solution to adjust the pH value to 5-6; and S3, performing a desalination process in the MVR evaporation crystallizer to evaporate condensed water and a mixed solution of high-salt and high-concentration mother liquor.
7. The use method of the treatment system for removing heavy metal components in the solidified fly ash leachate according to claim 5, wherein the treatment system comprises: the speed of the percolate stock solution pumped into the percolate stock solution MVR evaporation system through the lift pump is 2 tons/hour, the water yield of condensed water of the MVR evaporation crystallizer is 1.8 tons/hour, the discharge amount of a mixed solution of high salt and high-concentration mother solution is 200 kg/hour-220 kg/hour, after the mixed solution is treated by the membrane bioreactor, the ozone oxidation device and the active carbon filtering device, the content of C0D in the condensed water is less than 100ppm, and the content of ammonia nitrogen is less than 25 ppm.
8. The use method of the treatment system for removing heavy metal components in the solidified fly ash leachate according to claim 5, wherein the treatment system comprises: the method also comprises a heat source treatment process, wherein the heat source treatment process comprises the following steps: s1, compressing the vapor pressure into the forced circulation heater by the vapor compressor for preheating; s2, preheating to generate secondary steam, and separating the secondary steam by a forced circulation evaporator; and S3, compressing the separated secondary steam into a heat exchanger through a steam compressor to perform heat exchange work.
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| CN112960860A (en) * | 2021-02-23 | 2021-06-15 | 无锡江丰资源再生有限公司 | Treatment process for flue gas desulfurization wastewater by resource utilization of copper-containing waste |
| CN112960860B (en) * | 2021-02-23 | 2022-04-26 | 无锡江丰资源再生有限公司 | Treatment process for flue gas desulfurization wastewater by resource utilization of copper-containing waste |
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