CN113149284B - Device and method for reducing ammonia nitrogen in PVDC resin production wastewater - Google Patents
Device and method for reducing ammonia nitrogen in PVDC resin production wastewater Download PDFInfo
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- CN113149284B CN113149284B CN202110480147.5A CN202110480147A CN113149284B CN 113149284 B CN113149284 B CN 113149284B CN 202110480147 A CN202110480147 A CN 202110480147A CN 113149284 B CN113149284 B CN 113149284B
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
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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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
- C02F2103/38—Polymers
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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Abstract
The invention discloses a device and a method for reducing ammonia nitrogen in PVDC resin production wastewater. The method has the advantages that the method can effectively control the ammonia nitrogen content in the final discharged wastewater of the factory to be within the discharge standard, and is more environment-friendly.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a device and a method for reducing ammonia nitrogen in PVDC resin production wastewater.
Background
The waste water discharged by food-grade polyvinylidene chloride resin (PVDC resin for short) produced by companies comes from two aspects of product production and domestic sewage. The waste water generated in the production of the product comes from a vinylidene chloride monomer manufacturing process, a PVDC resin polymerization process and a PVDC resin drying process. Ammonia nitrogen in the factory discharged wastewater is an important index in wastewater discharge, and the current national standard requirement is below 25 mg/L. The ammonia nitrogen in the wastewater discharged by the factory mainly comes from the manufacturing process of the vinylidene chloride monomer and domestic sewage, wherein the ammonia nitrogen content in the wastewater of the manufacturing process of the vinylidene chloride monomer accounts for 90 percent of the ammonia nitrogen content in the total discharged wastewater, and the ammonia nitrogen content in the wastewater discharged by the factory after primary treatment in the factory at present meets the national discharge standard requirement and can be directly discharged. However, when the production of the vinylidene chloride monomer manufacturing process is abnormal, the ammonia nitrogen content in the wastewater discharged by a factory exceeds 25mg/L of the discharge standard, so that the wastewater discharge is stopped suddenly, the production load is reduced when the wastewater is serious, and even the vinylidene chloride monomer manufacturing process is stopped.
Disclosure of Invention
The invention aims to provide a method for reducing ammonia nitrogen in PVDC resin production wastewater.
The technical purpose of the invention is realized by the following technical scheme:
a device for cutting down ammonia nitrogen in PVDC resin production wastewater is characterized in that: comprises an original wastewater storage tank, an aeration tower, a fan, a temporary wastewater storage tank, an ammonia nitrogen detection system and an ammonia nitrogen remover storage tank. The raw wastewater storage tank is communicated with a water inlet at the upper part of the aeration tower through a water inlet pipe; the fan is communicated with an air inlet at the lower part of the aeration tower; the temporary wastewater storage tank is communicated with a water outlet at the bottom of the aeration tower through a water outlet pipe; the ammonia nitrogen remover storage tank is communicated with a liquid inlet at the lower part of the aeration tower; the ammonia nitrogen detection system is respectively communicated with the water inlet pipe and the water outlet pipe.
Preferably, a plurality of spray headers are arranged at the water inlet in the aeration tower.
Preferably, a first ball valve, an ammonia nitrogen remover delivery pump and an ammonia nitrogen remover flow regulating valve are sequentially and respectively arranged between the ammonia nitrogen remover storage tank and the liquid inlet.
Preferably, a silencer is arranged at the air inlet of the fan, and an air inlet valve is arranged between the fan and the silencer.
Preferably, the ammonia nitrogen detection system comprises a first wastewater sampling pump, a second wastewater sampling pump, a sampling switcher and an ammonia nitrogen analyzer. The inlet of the first wastewater sampling pump is communicated with the water inlet pipe; the inlet of the second wastewater sampling pump is communicated with the water outlet pipe; the outlet of the first wastewater sampling pump and the outlet of the second wastewater sampling pump are communicated with one end of the sampling switcher; the other end of the sampling switcher is communicated with an ammonia nitrogen analyzer.
Preferably, the water outlet pipe is provided with a second ball valve between the second wastewater sampling pump and the water outlet pipe communication port and the wastewater temporary storage tank.
A method for reducing ammonia nitrogen in PVDC resin production wastewater is characterized by comprising the following steps: the method comprises the following steps:
s1, the vinylidene chloride monomer process production wastewater stored in an original wastewater storage tank falls to the bottom in the aeration tower from the upper part of the aeration tower in a spraying mode;
s2, opening an air inlet valve and a fan at the moment, fully contacting the wastewater with air blown from the lower part of the aeration tower in the falling process, desorbing related volatile substances in the wastewater, and discharging the wastewater from the top of the aeration tower after the volatile substances escape from the wastewater;
s3, opening a first ball valve, an ammonia nitrogen remover delivery pump and an ammonia nitrogen remover flow regulating valve, delivering an ammonia nitrogen remover to the ammonia nitrogen remover flow regulating valve through the ammonia nitrogen remover delivery pump from an ammonia nitrogen remover storage tank, allowing the ammonia nitrogen remover to enter the wastewater at the bottom of the aeration tower through regulation of the regulating valve at a set flow rate, allowing the ammonia nitrogen remover to react with the ammonia nitrogen in the wastewater to finally convert the ammonia nitrogen in the wastewater into nitrogen, discharging the nitrogen and the air entering from the bottom of the aeration tower from the top of the aeration tower together, reducing the ammonia nitrogen content in the wastewater, and allowing the treated wastewater to enter a wastewater temporary storage tank through a second ball valve and a drain pipe;
s4, starting the ammonia nitrogen detection system, simultaneously sampling the ammonia nitrogen detection system from the water inlet pipe and the water outlet pipe through the sampling pump, analyzing a wastewater sample after the wastewater sample enters the ammonia nitrogen analyzer through the sampling switcher, and closing the ammonia nitrogen detection system after the analysis is finished;
s5, comparing the analysis results of the ammonia nitrogen content in the vinylidene chloride monomer process wastewater at the water inlet pipe and the water outlet pipe, adjusting the flow regulating valve of the ammonia nitrogen remover after calculation, circularly opening the ammonia nitrogen detection system for sampling analysis, and correspondingly adjusting the flow regulating valve of the ammonia nitrogen remover so that the ammonia nitrogen content of the wastewater finally discharged from the vinylidene chloride monomer process is within the control requirement range after the wastewater is treated by the ammonia nitrogen remover.
In conclusion, the invention has the following beneficial effects:
1. the ammonia nitrogen remover is adopted to carry out chemical reaction with ammonia nitrogen in the wastewater, hypochlorous acid is generated in the reaction process, the hypochlorous acid is easily decomposed into harmful gas to escape due to instability of the hypochlorous acid, and after the gas is contacted with wastewater discharged from a vinylidene chloride monomer process sprayed from the upper part of the aeration tower, the harmful gas is absorbed by water and carries out chemical reaction with the ammonia nitrogen in the wastewater, so that the ammonia nitrogen in the wastewater is preliminarily reduced before the wastewater reaches the bottom of the aeration tower, and meanwhile, the decomposed gas of the hypochlorous acid is prevented from being discharged to the atmosphere to pollute the environment.
2. According to the invention, the ammonia nitrogen removal agent flow regulating valve is adjusted by adopting the ammonia nitrogen detection system in a circulating manner, so that the ammonia nitrogen content of the wastewater finally discharged from the vinylidene chloride monomer process is within the control requirement range after the wastewater is treated by the ammonia nitrogen removal agent, the adjusting effect is better, and the effective reduction of the ammonia nitrogen is realized.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings, and the present embodiment is not to be construed as limiting the invention.
The device for reducing ammonia nitrogen in PVDC resin production wastewater as shown in figure 1 comprises an original wastewater storage tank 2, an aeration tower 1, a fan 3, a temporary wastewater storage tank 4, an ammonia nitrogen detection system and an ammonia nitrogen remover storage tank 5. The raw waste water storage tank 2 is communicated with a water inlet at the upper part of the aeration tower 1 through a water inlet pipe 6; the fan 3 is communicated with an air inlet at the lower part of the aeration tower 1; the temporary wastewater storage tank 4 is communicated with a water outlet at the bottom of the aeration tower 1 through a water outlet pipe 7; the ammonia nitrogen remover storage tank 5 is communicated with a liquid inlet at the lower part of the aeration tower 1; the ammonia nitrogen detection system is respectively communicated with the water inlet pipe 6 and the water outlet pipe 7.
The aeration tower 1 is internally provided with a plurality of spray headers at the water inlet, and the spray headers can spray the production wastewater of the vinylidene chloride monomer process in the original wastewater storage tank 2 in a spraying manner, so that the reaction contact area of the wastewater is increased, and the overall reaction efficiency is increased.
A first ball valve 8, an ammonia nitrogen remover delivery pump 9 and an ammonia nitrogen remover flow regulating valve 10 are sequentially and respectively arranged between the ammonia nitrogen remover storage tank 5 and the liquid inlet; the ammonia nitrogen remover delivery pump 9 can stably feed the ammonia nitrogen remover into the aeration tower 1 through the liquid inlet and react with ammonia nitrogen in the waste liquid. The ammonia nitrogen remover flow regulating valve 10 can regulate the adding amount of the ammonia nitrogen remover and control the ammonia nitrogen content in the wastewater after the reaction to reach the required range. Hypochlorous acid is generated when the ammonia nitrogen remover and ammonia nitrogen in the wastewater are subjected to chemical reaction. Due to the instability of the hypochlorous acid, the hypochlorous acid is extremely easy to decompose into harmful gas to escape, and after the gas is contacted with the wastewater discharged from the vinylidene chloride monomer process sprayed from the upper part of the aeration tower 1, the harmful gas is absorbed by water and chemically reacts with ammonia nitrogen in the wastewater, so that the ammonia nitrogen in the wastewater is preliminarily reduced before the wastewater reaches the bottom of the aeration tower 1, and meanwhile, the decomposed gas of the hypochlorous acid is prevented from being discharged to the atmosphere to pollute the environment.
3 air intakes of fan are provided with silencer 11, are provided with admission valve 12 between fan 3 and the silencer 11, and silencer 11 can reduce 3 noises of fan, the holistic silence ability of hoisting device.
The ammonia nitrogen detection system comprises a first wastewater sampling pump 13, a second wastewater sampling pump 14, a sampling switcher 15 and an ammonia nitrogen analyzer 16. The inlet of the first wastewater sampling pump 13 is communicated with the water inlet pipe 6; the inlet of the second wastewater sampling pump 14 is communicated with the water outlet pipe 7; the outlet of the first wastewater sampling pump 13 and the outlet of the second wastewater sampling pump 14 are communicated with one end of a sampling switcher 15; the other end of the sampling switcher 15 is communicated with an ammonia nitrogen analyzer 16.
The water outlet pipe 7 is provided with a second ball valve 17 between a communication port of the second wastewater sampling pump 14 and the water outlet pipe 7 and the temporary wastewater storage tank 4, and the second ball valve 17 is matched with an ammonia nitrogen detection system so as to realize continuous monitoring of wastewater circulation.
A method for reducing ammonia nitrogen in waste water generated in PVDC resin production comprises the following steps:
s1, the vinylidene chloride monomer process production wastewater stored in an original wastewater storage tank falls to the bottom in the aeration tower from the upper part of the aeration tower in a spraying mode.
And S2, opening the air inlet valve and the fan at the moment, fully contacting the wastewater with air blown from the lower part of the aeration tower in the falling process, desorbing related volatile substances in the wastewater, and discharging the wastewater from the top of the aeration tower after the volatile substances escape from the wastewater.
S3, opening the first ball valve, the ammonia nitrogen remover delivery pump and the ammonia nitrogen remover flow regulating valve, delivering the ammonia nitrogen remover to the ammonia nitrogen remover flow regulating valve through the ammonia nitrogen remover delivery pump from the ammonia nitrogen remover storage tank, allowing the ammonia nitrogen remover to react with the ammonia nitrogen in the wastewater to finally convert the ammonia nitrogen in the wastewater into nitrogen, discharging the nitrogen and the air entering from the bottom of the aeration tower from the top of the aeration tower together, reducing the ammonia nitrogen content in the wastewater, and allowing the treated wastewater to enter a wastewater temporary storage tank through the second ball valve and the drain pipe.
S4, the ammonia nitrogen detection system is started, the ammonia nitrogen detection system samples from the water inlet pipe and the water outlet pipe through the sampling pump, the waste water sample is analyzed after entering the ammonia nitrogen analyzer through the sampling switcher, and the ammonia nitrogen detection system is closed after the analysis is completed.
S5, comparing the analysis results of the ammonia nitrogen content in the vinylidene chloride monomer process wastewater at the water inlet pipe and the water outlet pipe, adjusting an ammonia nitrogen remover flow regulating valve after calculation, circularly opening an ammonia nitrogen detection system for sampling analysis, and correspondingly adjusting the ammonia nitrogen remover flow regulating valve to ensure that the ammonia nitrogen content reaches the control requirement range after the wastewater finally discharged from the vinylidene chloride monomer process is treated by the ammonia nitrogen remover.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention.
Claims (7)
1. A device for cutting down ammonia nitrogen in PVDC resin production wastewater is characterized in that: the system comprises an original waste water storage tank, an aeration tower, a fan, a waste water temporary storage tank, an ammonia nitrogen detection system and an ammonia nitrogen remover storage tank, wherein the original waste water storage tank is communicated with a water inlet at the upper part of the aeration tower through a water inlet pipe, the fan is communicated with an air inlet at the lower part of the aeration tower, the waste water temporary storage tank is communicated with a water outlet at the bottom of the aeration tower through a water outlet pipe, the ammonia nitrogen remover storage tank is communicated with a liquid inlet at the lower part of the aeration tower, the ammonia nitrogen detection system is respectively communicated with the water inlet pipe and the water outlet pipe, hypochlorous acid is generated when the ammonia nitrogen remover chemically reacts with the ammonia nitrogen in the waste water, the ammonia nitrogen is easily decomposed into harmful gas to escape due to instability of the hypochlorous acid, and after the gas is contacted with the waste water discharged from a vinylidene chloride monomer process sprayed from the upper part of the aeration tower, the harmful gas is absorbed by water and chemically reacts with the ammonia nitrogen in the waste water before the waste water reaches the bottom of the aeration tower, and meanwhile, the decomposed gas of the preliminary hypochlorous acid is prevented from being discharged to the atmosphere to pollute the environment.
2. The device for reducing ammonia nitrogen in PVDC resin production wastewater according to claim 1, characterized in that: and a plurality of spray heads are arranged at the water inlet inside the aeration tower.
3. The device for reducing ammonia nitrogen in waste water generated in PVDC resin production according to claim 1, wherein: and a first ball valve, an ammonia nitrogen remover delivery pump and an ammonia nitrogen remover flow regulating valve are sequentially and respectively arranged between the ammonia nitrogen remover storage tank and the liquid inlet.
4. The device for reducing ammonia nitrogen in PVDC resin production wastewater according to claim 1, characterized in that: the air inlet of the fan is provided with a silencer, and an air inlet valve is arranged between the fan and the silencer.
5. The device for reducing ammonia nitrogen in PVDC resin production wastewater according to claim 1, characterized in that: the ammonia nitrogen detecting system comprises a first wastewater sampling pump, a second wastewater sampling pump, a sampling switcher and an ammonia nitrogen analyzer, wherein the inlet of the first wastewater sampling pump is communicated with the water inlet pipe, the inlet of the second wastewater sampling pump is communicated with the water outlet pipe, the outlet of the first wastewater sampling pump is communicated with the outlet of the second wastewater sampling pump and communicated with one end of the sampling switcher, and the other end of the sampling switcher is communicated with the ammonia nitrogen analyzer.
6. The device for reducing ammonia nitrogen in PVDC resin production wastewater according to claim 5, characterized in that: and the water outlet pipe is provided with a second ball valve between the second wastewater sampling pump and the water outlet pipe communication port and the wastewater temporary storage tank.
7. A method for reducing ammonia nitrogen in PVDC resin production wastewater is characterized by comprising the following steps: the method comprises the following steps:
s1, the vinylidene chloride monomer process production wastewater stored in an original wastewater storage tank falls to the bottom in the aeration tower from the upper part of the aeration tower in a spraying mode;
s2, opening an air inlet valve and a fan at the moment, fully contacting the wastewater with air blown from the lower part of the aeration tower in the falling process, desorbing related volatile substances in the wastewater, and discharging the wastewater from the top of the aeration tower after the volatile substances escape from the wastewater;
s3, opening a first ball valve, an ammonia nitrogen remover delivery pump and an ammonia nitrogen remover flow regulating valve, delivering an ammonia nitrogen remover to the ammonia nitrogen remover flow regulating valve through the ammonia nitrogen remover delivery pump from an ammonia nitrogen remover storage tank, allowing the ammonia nitrogen remover to enter the wastewater at the bottom of the aeration tower through regulation of the regulating valve at a set flow rate, allowing the ammonia nitrogen remover to react with the ammonia nitrogen in the wastewater to finally convert the ammonia nitrogen in the wastewater into nitrogen, discharging the nitrogen and the air entering from the bottom of the aeration tower from the top of the aeration tower together, reducing the ammonia nitrogen content in the wastewater, and allowing the treated wastewater to enter a wastewater temporary storage tank through a second ball valve and a drain pipe;
s4, starting an ammonia nitrogen detection system, simultaneously sampling the ammonia nitrogen detection system from a water inlet pipe and a water outlet pipe through a sampling pump, analyzing a wastewater sample after the wastewater sample enters an ammonia nitrogen analyzer through a sampling switcher, and closing the ammonia nitrogen detection system after the analysis is finished;
s5, comparing the analysis results of the ammonia nitrogen content in the vinylidene chloride monomer process wastewater at the water inlet pipe and the water outlet pipe, adjusting the flow regulating valve of the ammonia nitrogen remover after calculation, circularly opening the ammonia nitrogen detection system for sampling analysis, and correspondingly adjusting the flow regulating valve of the ammonia nitrogen remover so that the ammonia nitrogen content of the wastewater finally discharged from the vinylidene chloride monomer process is within the control requirement range after the wastewater is treated by the ammonia nitrogen remover.
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Citations (5)
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| CN106396184A (en) * | 2016-11-17 | 2017-02-15 | 上海晶宇环境工程股份有限公司 | Ammonia stripping process and device for high-ammonia-nitrogen wastewater |
| CN211999002U (en) * | 2020-03-09 | 2020-11-24 | 上海浩为环境工程有限公司 | Automatic dosing control system for breakpoint chlorine, deamination and denitrification |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106554132B (en) * | 2016-10-12 | 2017-12-22 | 南京大学 | A kind of the sewage deep nitrogen rejection facility and its operation method of high pollutant carrying capacity low energy consumption |
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- 2021-04-30 CN CN202110480147.5A patent/CN113149284B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100839891B1 (en) * | 2007-07-03 | 2008-06-26 | (주)범한엔지니어링 종합건축사 사무소 | Apparatus for treatment bank filtered water including nitrate nitrogen |
| CN201276469Y (en) * | 2008-03-25 | 2009-07-22 | 中国科学院广州地球化学研究所 | Apparatus for processing difficult biochemical treatment ammonia nitrogen wastewater by break-point chlorination |
| CN102060399A (en) * | 2010-11-30 | 2011-05-18 | 常州大学 | Ammonia nitrogen removing device assisting organic compound denitrifier in treating high concentration ammonia nitrogen wastewater |
| CN106396184A (en) * | 2016-11-17 | 2017-02-15 | 上海晶宇环境工程股份有限公司 | Ammonia stripping process and device for high-ammonia-nitrogen wastewater |
| CN211999002U (en) * | 2020-03-09 | 2020-11-24 | 上海浩为环境工程有限公司 | Automatic dosing control system for breakpoint chlorine, deamination and denitrification |
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