CN109796101A - A kind of paraquat waste water high-efficiency, resource utilization treatment process technology - Google Patents
A kind of paraquat waste water high-efficiency, resource utilization treatment process technology Download PDFInfo
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- CN109796101A CN109796101A CN201910137117.7A CN201910137117A CN109796101A CN 109796101 A CN109796101 A CN 109796101A CN 201910137117 A CN201910137117 A CN 201910137117A CN 109796101 A CN109796101 A CN 109796101A
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Abstract
The present invention provides a kind of paraquat waste water high-efficiencies, resource utilization treatment process technology, including waste water prevapourising, pH value adjustment to pre-process；Mixed liquor rectifying, the cooling recovery processing of methanol solution；Ammonia rectifying, ammonium hydroxide cooling cycle utilize three big steps；Treated that waste water cod is less than 3000mg/L for paraquat waste water high-efficiency provided by the invention, resource utilization treatment process, ammonia nitrogen is less than 350mg/L, it can cover for producing workshop section, additionally by recovery process, production workshop section is applied to after methanol, liquefied ammonia can be recycled step by step, its simple process, high-efficient, operating cost is low.
Description
Technical field
The present invention relates to technical field of waste water processing more particularly to a kind of paraquat waste water high-efficiencies, resource utilization processing
Technology.
Background technique
Paraquat, chemical name are 1-1- dimethyl -4-4- bipyridine cation salt, are a kind of quick total weed controls
Agent.A large amount of waste water can be generated during the production of paraquat herbicide, the index of COD and ammonia-nitrogen content is very in waste water
It is high, it is therefore desirable to just to can be carried out discharge after handling waste water.
In existing paraquat wastewater treatment process, paraquat waste water is generating one containing first after evaporation and concentration is handled
The secondary steam condensed water containing high ammonia nitrogen, the method that known waste water containing low boiling point solvent mostly uses greatly rectifying are handled alcohol simultaneously, energy
Low boiling point solvent is effectively removed, the COD of waste water is reduced, but can not efficiently remove ammonia nitrogen, especially the ammonium root of ionic state, waste water
Biodegradability is lower, needs separately to increase the equipment of removal ammonia nitrogen, reduces ammonia nitrogen in waste water, and drops ammonia nitrogen equipment and generally understand ammonium salt as by-product by
Solution can not be utilized directly, need concentrate crystallization again, process is long, low efficiency, and operating cost is higher.In view of the above problems, invention
It is a kind of efficiently, the technique of recycling treatment paraquat waste water is one and compels technical problem to be solved.
Summary of the invention
(1) the technical issues of solving
In order to overcome existing time condensation water containing methanol, ammonia-nitrogen content high disposal technique cannot reduce waste water COD simultaneously simultaneously
And the problem of ammonia nitrogen, the invention provide the processing work of a kind of high COD, high ammonia-nitrogen wastewater efficient process and resource utilization
Skill.
(2) technical solution
The present invention is achieved by the following technical programs:
A kind of paraquat waste water high-efficiency, resource utilization treatment process technology, comprising the following steps:
1) Wastewater Pretreatment: carrying out heating concentration for paraquat waste water, then carry out double evaporation-cooling to the waste water after concentration, and
Lye is added dropwise in the condensed water generated to double evaporation-cooling, control PH is 9~12；
2) mixed liquor rectifying: being transported mixed liquor obtained in step 1 into rectifier unit by delivery pump, and control is boiled again
Device temperature carries out rectifying at 100~105 DEG C, to mixed liquor, and the gas that top generates in distillation process is passed through in condenser system
Cooling recycling obtains methanol solution, from rectifier unit bottom extracted waste water after rectifying, and waste water is directly used in production set
With or be directly discharged into biochemical system；
3) Ammonia recovery: it will be passed through in ammonia absorption system in step 2 by the not liquefied ammonia of condenser system and dilute ammonia is made
Water, then transported weak aqua ammonia into ammonia rectifier unit by delivery pump, then controlling reboiler temperature is 100~120 DEG C, control
Top temperature is 25~35 DEG C of progress liquefied ammonia recycling, while producing bottom liquid from ammonia rectifier unit bottom, and bottom liquid is cold by heat exchanger
But it is passed through in ammonia absorption system and is recycled afterwards.
Preferably, the concentration of lye is 32% in the step 1.
Preferably, the transporting rate of delivery pump is 6~7m in the step 23/h。
Preferably, the rectifier unit in the step 2 is that rectifying column or gravity bed are one such.
Preferably, the refrigerant in the condenser system in the step 2 is recirculated water, and controls waste water by adjusting reflux ratio
Rectifying section tower top temperature is 85~95 DEG C.
Preferably, the concentration of methanol solution recycled in the step 2 is 35~45%.
Preferably, the refrigerant of heat exchanger is recirculated water in the step 3.
Preferably, index is that COD content is greater than 50000mg/L before the paraquat wastewater treatment, and ammonia-nitrogen content is greater than
3000mg/L, COD is less than 3000mg/L after rectifying post-processes, and ammonia-nitrogen content is less than 300mg/L.
(3) beneficial effect
1, the present invention adjusts the charging of waste water rectifier unit by the way that liquid alkaline is added dropwise during COD drops in waste water rectifier unit
PH, so that solvent and ammonia nitrogen in waste water is sufficiently volatilized, while removing the solvent in waste water and ammonia nitrogen, then pass through rectifier unit top temperature
The methanol solvate for recycling certain content is adjusted, absorbs the ammonia that low concentration is made in ammonia in gas phase finally by ammonia absorption system
Liquefied ammonia recycling is made into ammonia rectifying column in water, low concentration ammonium hydroxide, and tower bottom Produced Liquid returns ammonia absorption system after cooling and repeats to make
With achieving the purpose that recovery ammonia, treated waste water can directly be applied to production workshop section achievees the purpose that resource utilization；
2, after the present invention treated wastewater treatment, COD is less than 3000mg/L, and ammonia nitrogen is less than 300mg/L, can be directly used for
Production is applied or is directly discharged into biochemical system；
3, the simple process of present invention processing waste water, high-efficient, operating cost is low.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, required attached drawing will be described to embodiment below and will be made
Simply introduce, it should be apparent that, drawings in the following description are only some embodiments of the invention, common for this field
For technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is process flow chart of wastewater treatment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
Every other embodiment obtained, shall fall within the protection scope of the present invention under the premise of creative work.
Embodiment 1:
A kind of paraquat waste water high-efficiency, resource utilization treatment process, its step are as follows:
1t paraquat waste water is subjected to heating and is concentrated into the 45% of original volume, then secondary steaming is carried out to the waste water after concentration
Hair, and it is 32% lye that concentration is added dropwise in the condensed water generated to double evaporation-cooling, controls PH 10 or so；
By delivery pump by the mixed liquor after lye is added dropwise with 6m3The transporting rate of/h is transported into rectifying column, and control is again
When boiling device temperature is 100 DEG C, rectifying is carried out to mixed liquor, the gas that top generates in distillation process is passed through in condenser system,
Refrigerant in middle condenser system is recirculated water, and is 90 DEG C by adjusting reflux ratio to control waste water rectifying section tower top temperature, cooling
Recycling obtains the methanol solution that concentration is 40%, from rectifier unit bottom extracted waste water after rectifying, and waste water is directly used
It applies or is directly discharged into biochemical system in production；
It is passed through in ammonia absorption system in distillation process by the not liquefied ammonia of condenser system and weak aqua ammonia is made, then by defeated
Pump is sent to transport weak aqua ammonia into ammonia rectifier unit, then controlling reboiler temperature is 110 DEG C, and control top temperature is 30 DEG C of progress liquid
Recovery ammonia, while bottom liquid is produced from ammonia rectifier unit bottom, and bottom liquid is passed through into heat exchanger, wherein the refrigerant of heat exchanger is circulation
Water is passed through in ammonia absorption system again after cooling and is recycled.
Embodiment 2:
A kind of paraquat waste water high-efficiency, resource utilization treatment process, its step are as follows:
1t paraquat waste water is subjected to heating and is concentrated into the 45% of original volume, then secondary steaming is carried out to the waste water after concentration
Hair, and it is 32% lye that concentration is added dropwise in the condensed water generated to double evaporation-cooling, controls PH 12 or so；
By delivery pump by the mixed liquor after lye is added dropwise with 6m3The transporting rate of/h is transported into rectifying column, and control is again
When boiling device temperature is 100 DEG C, rectifying is carried out to mixed liquor, the gas that top generates in distillation process is passed through in condenser system,
Refrigerant in middle condenser system is recirculated water, and is 90 DEG C by adjusting reflux ratio to control waste water rectifying section tower top temperature, cooling
Recycling obtains the methanol solution that concentration is 42%, from rectifier unit bottom extracted waste water after rectifying, and waste water is directly used
It applies or is directly discharged into biochemical system in production；
It is passed through in ammonia absorption system in distillation process by the not liquefied ammonia of condenser system and weak aqua ammonia is made, then by defeated
Pump is sent to transport weak aqua ammonia into ammonia rectifier unit, then controlling reboiler temperature is 110 DEG C, and control top temperature is 30 DEG C of progress liquid
Recovery ammonia, while bottom liquid is produced from ammonia rectifier unit bottom, and bottom liquid is passed through into heat exchanger, wherein the refrigerant of heat exchanger is circulation
Water is passed through in ammonia absorption system again after cooling and is recycled.
Embodiment 3:
A kind of paraquat waste water high-efficiency, resource utilization treatment process, its step are as follows:
1t paraquat waste water is subjected to heating and is concentrated into the 45% of original volume, then secondary steaming is carried out to the waste water after concentration
Hair, and it is 32% lye that concentration is added dropwise in the condensed water generated to double evaporation-cooling, controls PH 11 or so；
By delivery pump by the mixed liquor after lye is added dropwise with 7m3The transporting rate of/h is transported into rectifying column, and control is again
When boiling device temperature is 105 DEG C, rectifying is carried out to mixed liquor, the gas that top generates in distillation process is passed through in condenser system,
Refrigerant in middle condenser system is recirculated water, and is 95 DEG C by adjusting reflux ratio to control waste water rectifying section tower top temperature, cooling
Recycling obtains the methanol solution that concentration is 37%, from rectifier unit bottom extracted waste water after rectifying, and waste water is directly used
It applies or is directly discharged into biochemical system in production；
It is passed through in ammonia absorption system in distillation process by the not liquefied ammonia of condenser system and weak aqua ammonia is made, then by defeated
Pump is sent to transport weak aqua ammonia into ammonia rectifier unit, then controlling reboiler temperature is 115 DEG C, and control top temperature is 25 DEG C of progress liquid
Recovery ammonia, while bottom liquid is produced from ammonia rectifier unit bottom, and bottom liquid is passed through into heat exchanger, wherein the refrigerant of heat exchanger is circulation
Water is passed through in ammonia absorption system again after cooling and is recycled.
Embodiment 4:
A kind of paraquat waste water high-efficiency, resource utilization treatment process, its step are as follows:
1t paraquat waste water is subjected to heating and is concentrated into the 40% of original volume, then secondary steaming is carried out to the waste water after concentration
Hair, and it is 32% lye that concentration is added dropwise in the condensed water generated to double evaporation-cooling, controls PH 9 or so；
By delivery pump by the mixed liquor after lye is added dropwise with 6m3The transporting rate of/h is transported into rectifying column, and control is again
When boiling device temperature is 105 DEG C, rectifying is carried out to mixed liquor, the gas that top generates in distillation process is passed through in condenser system,
Refrigerant in middle condenser system is recirculated water, and is 85 DEG C by adjusting reflux ratio to control waste water rectifying section tower top temperature, cooling
Recycling obtains the methanol solution that concentration is 43%, from rectifier unit bottom extracted waste water after rectifying, and waste water is directly used
It applies or is directly discharged into biochemical system in production；
It is passed through in ammonia absorption system in distillation process by the not liquefied ammonia of condenser system and weak aqua ammonia is made, then by defeated
Pump is sent to transport weak aqua ammonia into ammonia rectifier unit, then controlling reboiler temperature is 105 DEG C, and control top temperature is 25 DEG C of progress liquid
Recovery ammonia, while bottom liquid is produced from ammonia rectifier unit bottom, and bottom liquid is passed through into heat exchanger, wherein the refrigerant of heat exchanger is circulation
Water is passed through in ammonia absorption system again after cooling and is recycled.
Embodiment 5:
A kind of paraquat waste water high-efficiency, resource utilization treatment process, its step are as follows:
1t paraquat waste water is subjected to heating and is concentrated into the 45% of original volume, then secondary steaming is carried out to the waste water after concentration
Hair, and it is 32% lye that concentration is added dropwise in the condensed water generated to double evaporation-cooling, controls PH 10 or so；
By delivery pump by the mixed liquor after lye is added dropwise with 6m3The transporting rate of/h is transported into rectifying column, and control is again
When boiling device temperature is 100 DEG C, rectifying is carried out to mixed liquor, the gas that top generates in distillation process is passed through in condenser system,
Refrigerant in middle condenser system is recirculated water, and is 85 DEG C by adjusting reflux ratio to control waste water rectifying section tower top temperature, cooling
Recycling obtains the methanol solution that concentration is 42%, from rectifier unit bottom extracted waste water after rectifying, and waste water is directly used
It applies or is directly discharged into biochemical system in production；
It is passed through in ammonia absorption system in distillation process by the not liquefied ammonia of condenser system and weak aqua ammonia is made, then by defeated
Pump is sent to transport weak aqua ammonia into ammonia rectifier unit, then controlling reboiler temperature is 105 DEG C, and control top temperature is 25 DEG C of progress liquid
Recovery ammonia, while bottom liquid is produced from ammonia rectifier unit bottom, and bottom liquid is passed through into heat exchanger, wherein the refrigerant of heat exchanger is circulation
Water is passed through in ammonia absorption system again after cooling and is recycled.
Embodiment 6:
A kind of paraquat waste water high-efficiency, resource utilization treatment process, its step are as follows:
1t paraquat waste water is subjected to heating and is concentrated into the 40% of original volume, then secondary steaming is carried out to the waste water after concentration
Hair, and it is 32% lye that concentration is added dropwise in the condensed water generated to double evaporation-cooling, controls PH 10 or so；
By delivery pump by the mixed liquor after lye is added dropwise with 6m3The transporting rate of/h is transported into rectifying column, and control is again
When boiling device temperature is 105 DEG C, rectifying is carried out to mixed liquor, the gas that top generates in distillation process is passed through in condenser system,
Refrigerant in middle condenser system is recirculated water, and is 90 DEG C by adjusting reflux ratio to control waste water rectifying section tower top temperature, cooling
Recycling obtains the methanol solution that concentration is 38%, from rectifier unit bottom extracted waste water after rectifying, and waste water is directly used
It applies or is directly discharged into biochemical system in production；
It is passed through in ammonia absorption system in distillation process by the not liquefied ammonia of condenser system and weak aqua ammonia is made, then by defeated
Pump is sent to transport weak aqua ammonia into ammonia rectifier unit, then controlling reboiler temperature is 120 DEG C, and control top temperature is 25 DEG C of progress liquid
Recovery ammonia, while bottom liquid is produced from ammonia rectifier unit bottom, and bottom liquid is passed through into heat exchanger, wherein the refrigerant of heat exchanger is circulation
Water is passed through in ammonia absorption system again after cooling and is recycled.
Before treatment, COD therein is greater than 50000mg/L to the withered waste water of medium-height grass of the present invention, ammonia-nitrogen content is greater than 3000mg/L.
The concentration and volume of the methanol solution recycled into embodiment 6 to embodiment 1 measure, while to every group of implementation
The data record that treated paraquat waste water COD, ammonia-nitrogen content are detected, and will obtained in example, obtains table 1:
Table 1
From the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to aforementioned implementation
Invention is explained in detail for example, those skilled in the art should understand that: it still can be to aforementioned each reality
Technical solution documented by example is applied to modify or equivalent replacement of some of the technical features；And these modification or
Person's replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of paraquat waste water high-efficiency, resource utilization treatment process technology, which comprises the following steps:
1) Wastewater Pretreatment: carrying out heating concentration for paraquat waste water, then carries out double evaporation-cooling to the waste water after concentration, and to two
Lye is added dropwise in the condensed water that secondary evaporation generates, control PH is 9~12；
2) mixed liquor rectifying: being transported mixed liquor obtained in step 1 into rectifier unit by delivery pump, controls reboiler temperature
Degree carries out rectifying at 100~105 DEG C, to mixed liquor, and the gas that top generates in distillation process is passed through in condenser system cooling
Recycling obtain methanol solution, from rectifier unit bottom extracted waste water after rectifying, and by waste water be directly used in production apply or
Person is directly discharged into biochemical system；
3) Ammonia recovery: will be passed through in ammonia absorption system by the not liquefied ammonia of condenser system in step 2 and weak aqua ammonia is made, then
Weak aqua ammonia is transported into ammonia rectifier unit by delivery pump, then controlling reboiler temperature is 100~120 DEG C, control top temperature
For 25~35 DEG C of progress liquefied ammonia recycling, while bottom liquid is produced from ammonia rectifier unit bottom, and by bottom liquid after heat exchanger is cooling
It is passed through in ammonia absorption system and is recycled.
2. paraquat waste water high-efficiency according to claim 1, resource utilization treatment process technology, which is characterized in that institute
The concentration for stating lye in step 1 is 32%.
3. paraquat waste water high-efficiency according to claim 1, resource utilization treatment process technology, which is characterized in that institute
The transporting rate for stating delivery pump in step 2 is 6~7m3/h。
4. paraquat waste water high-efficiency according to claim 1, resource utilization treatment process technology, which is characterized in that institute
Stating the rectifier unit in step 2 is that rectifying column or gravity bed are one such.
5. paraquat waste water high-efficiency according to claim 1, resource utilization treatment process technology, which is characterized in that institute
Stating the refrigerant in the condenser system in step 2 is recirculated water, and is by adjusting reflux ratio control waste water rectifying section tower top temperature
85~95 DEG C.
6. paraquat waste water high-efficiency according to claim 1, resource utilization treatment process technology, which is characterized in that institute
Stating the concentration of methanol solution recycled in step 2 is 35~45%.
7. paraquat waste water high-efficiency according to claim 1, resource utilization treatment process technology, which is characterized in that institute
The refrigerant for stating heat exchanger in step 3 is recirculated water.
8. paraquat waste water high-efficiency according to claim 1, resource utilization treatment process technology, which is characterized in that institute
Index is that COD content is greater than 50000mg/L before stating paraquat wastewater treatment, and ammonia-nitrogen content is greater than 3000mg/L, after rectifying
COD is less than 3000mg/L after processing, and ammonia-nitrogen content is less than 300mg/L.
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2019
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| CN1415396A (en) * | 2001-10-30 | 2003-05-07 | 浙江工业大学 | Deflection of jet type revolving bed equipment in hyper gravity field |
| CN101628767A (en) * | 2009-08-14 | 2010-01-20 | 山东科信生物化学有限公司 | Waste water integrated treatment method of paraquat produced by cyanamideprocess |
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