CN113200632A - Method for denitrifying water body entering estuary - Google Patents
Method for denitrifying water body entering estuary Download PDFInfo
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- CN113200632A CN113200632A CN202110521979.7A CN202110521979A CN113200632A CN 113200632 A CN113200632 A CN 113200632A CN 202110521979 A CN202110521979 A CN 202110521979A CN 113200632 A CN113200632 A CN 113200632A
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- seawater
- water body
- denitrifying
- river
- water
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/12—Halogens or halogen-containing compounds
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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
- C02F2103/08—Seawater, e.g. for desalination
Abstract
The invention relates to the technical field of water treatment, and discloses a method for denitrifying a water body entering a sea mouth from a river, which comprises the following steps: step one, pumping seawater to a sand setting clarification tank for pretreatment; step two, the pretreated seawater enters an electrolysis device, the seawater is ionized through an electrode, and hypochlorous acid and hydrogen are generated under the ionization of the electrode by utilizing chloride in the salt of the seawater; thirdly, performing denitrification treatment on the sewage by using a breakpoint dechlorination method through hypochlorous acid generated by seawater ionization; pressurizing hydrogen generated by seawater ionization, and aerating in the water body subjected to denitrification treatment by a breakpoint dechlorination method to remove residual chlorine; and step five, discharging after the water quality reaches the standard. According to the method for denitrifying the water body flowing into the sea mouth from the river, the seawater is used for ionizing to generate the hypochlorous acid, so that the cost is greatly reduced, the method is suitable for the water body with a large water volume, the denitrification reaction is slightly influenced by the change of the climate temperature, the value of hydrogen is fully utilized, and the method is more environment-friendly.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for denitrifying a water body flowing into a sea mouth from a river.
Background
With the writing of ecological civilization construction into constitutions by China, the requirements of China on environmental protection are higher and higher, the requirements on polluted river treatment are also improved equally, and the five categories are from black and odorous removal to elimination. The requirement is to reach three or four types of surface water, but the main pollution of the existing method for preventing the water quality of the river channel from reaching the standard is ammonia nitrogen. Especially, in the case of a flowing river, the amount of water is huge and the basin is wide, the salt water and the fresh water enter the sea mouth of the river to meet, and the boundary line of the intersection is frequently changed along with the size and the fluctuation of the flood due to factors such as tide and flood season, so that the currently adopted ecological technology is difficult to fix a biological method. For example, it is difficult for aquatic plants and microorganisms in salt water to survive in fresh water, and for aquatic plants and microorganisms in fresh water to survive in salt water. At the junction of salt and fresh water, the water is often the mouth of the river, and the water quality improvement is a difficult point for river control. Therefore, the invention discloses a method for denitrifying a water body flowing into a sea mouth from a river.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for denitrifying a water body flowing into a sea mouth from a river, which has the advantages of low cost, no influence of low temperature, environmental protection and the like, and solves the problems in the background art.
(II) technical scheme
In order to realize the purposes of low cost, no influence of low temperature and more environmental protection, the invention provides the following technical scheme: a method for denitrification of a water body flowing into a sea mouth from a river comprises the following steps:
step one, pumping seawater to a sand setting clarification tank for pretreatment;
step two, the pretreated seawater enters an electrolysis device, the seawater is ionized through an electrode, and hypochlorous acid and hydrogen are generated under the ionization of the electrode by utilizing chloride in the salt of the seawater;
thirdly, performing denitrification treatment on the sewage by using a breakpoint dechlorination method through hypochlorous acid generated by seawater ionization;
pressurizing hydrogen generated by seawater ionization, and aerating in the water body subjected to denitrification treatment by a breakpoint dechlorination method to remove residual chlorine;
and step five, discharging after the water quality reaches the standard.
Preferably, the seawater is pumped to a sand setting clarification tank for pretreatment, and coagulant is added into the seawater in the sand setting clarification tank to remove suspended solids SS and reduce COD and total phosphorus.
Preferably, the coagulant is polyaluminium chloride (PAC) and coagulant aid (PAM).
Preferably, the chloride in the salt of seawater comprises sodium chloride, potassium chloride and magnesium chloride.
Preferably, the electrodes include a positive electrode and a negative electrode, and are connected to the positive electrode and the negative electrode of the rectifier transformer through wires or bus bars, respectively.
The invention is mainly applied to river treatment, water quality improvement, aquaculture wastewater treatment or seawater desalination.
Compared with the prior art, the invention provides a method for denitrifying a water body entering a sea mouth from a river, which has the following beneficial effects:
1. the method for denitrifying the estuary water body adopts local materials, directly extracts and ionizes by using seawater to generate hypochlorous acid, and uses chloride in the seawater to replace chloride in salt, thereby greatly reducing the cost and being suitable for the large-water-volume water body.
2. According to the method for removing nitrogen from the water body flowing into the sea mouth from the river, ammonia nitrogen is removed from sewage by a hypo-ammonia breakpoint chlorine removal method generated by seawater electrode electrolysis, so that the inferior five types of water are eliminated, the influence of low temperature on nitrification and denitrification is compensated when a biological method is in a low-temperature state, and further the influence of climate temperature on denitrification reaction is small.
3. According to the method for removing nitrogen from the water body flowing into the sea mouth from the river, hydrogen generated by electrolysis of the seawater electrode is injected into the water body after nitrogen removal to remove residual chlorine from the water, so that the water body is safer and cleaner and more environment-friendly, and the value of hydrogen is fully utilized.
Drawings
FIG. 1 is a schematic flow chart of the process steps of the present invention;
FIG. 2 is a schematic view of a process flow of the present invention;
fig. 3 is a schematic structural diagram of a device for rapidly lifting the water quality of a river channel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a method for denitrification of water entering the sea mouth from a river comprises the following steps:
step one, pumping seawater to a sand setting clarification tank for pretreatment;
step two, the pretreated seawater enters an electrolysis device, the seawater is ionized through an electrode, and hypochlorous acid and hydrogen are generated under the ionization of the electrode by utilizing chloride in the salt of the seawater;
thirdly, performing denitrification treatment on the sewage by using a breakpoint dechlorination method through hypochlorous acid generated by seawater ionization;
pressurizing hydrogen generated by seawater ionization, and aerating in the water body subjected to denitrification treatment by a breakpoint dechlorination method to remove residual chlorine;
and step five, discharging after the water quality reaches the standard.
Furthermore, the step of pumping the seawater to the grit clarification tank for pretreatment is to add a coagulant into the seawater in the grit clarification tank to remove suspended solids SS and reduce COD and total phosphorus.
Further, the coagulant is polyaluminium chloride (PAC) and a coagulant aid (PAM).
Further, the chloride in the seawater salt comprises sodium chloride, potassium chloride and magnesium chloride.
Further, the electrodes include positive and negative electrodes, and are connected to the positive and negative electrodes of the rectifier transformer through wires or bus bars, respectively.
Example 1
As shown in figure 2, in the method for removing nitrogen from the estuary water body, when the aquaculture wastewater with salinity is treated, chloride in the aquaculture wastewater with salinity is directly utilized for ionization, so that hypochlorous acid is generated, the generated hypochlorous acid is mixed with the original aquaculture wastewater to perform the nitrogen removal by a breakpoint chlorine removal method, and the generated hydrogen is used for aerating the treated wastewater to remove residual chlorine.
Example 2
As shown in figure 3, the method for removing nitrogen from water body entering the sea mouth by river gushing comprises the steps of stacking a dosing coagulation device and an air flotation or biochemical system to form a riverway water quality rapid lifting device, pumping seawater (salt water) from a seawater (salt water) storage tank into an electrolytic tank, respectively connecting a positive electrode and a negative electrode of a rectifier transformer to electrolyze the seawater (salt water) in the electrolytic tank, feeding a hypochlorous acid solution generated by electrolysis into a mixing chamber, simultaneously adding a coagulant aid into the mixing chamber by PAC dosing and PAM dosing, pumping river water from the riverway into the mixing chamber by a lifting pump to react with the hypochlorous acid solution and the coagulant aid for nitrogen removal, precipitating the generated flocculate by inclined plate precipitation, aerating the denitrified water body by a pressurizing fan by using hydrogen generated by electrolysis, taking out residual chlorine, and discharging the residual chlorine into the riverway again through a water outlet.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for denitrifying a water body flowing into a sea mouth from a river is characterized by comprising the following steps:
step one, pumping seawater to a sand setting clarification tank for pretreatment;
step two, the pretreated seawater enters an electrolysis device, the seawater is ionized through an electrode, and hypochlorous acid and hydrogen are generated under the ionization of the electrode by utilizing chloride in the salt of the seawater;
thirdly, performing denitrification treatment on the sewage by using a breakpoint dechlorination method through hypochlorous acid generated by seawater ionization;
pressurizing hydrogen generated by seawater ionization, and aerating in the water body subjected to denitrification treatment by a breakpoint dechlorination method to remove residual chlorine;
and step five, discharging after the water quality reaches the standard.
2. The method for denitrifying the water body gushed into the sea mouth of the river according to claim 1, wherein the method comprises the following steps: the step of pumping seawater to a sand setting clarification tank for pretreatment is to add a coagulant into the seawater in the sand setting clarification tank to remove suspended solids SS and reduce COD and total phosphorus.
3. The method for denitrifying the water body gushed into the sea mouth of the river as claimed in claim 2, wherein: the coagulant is polyaluminium chloride PAC and coagulant aid PAM.
4. The method for denitrifying the water body gushed into the sea mouth of the river according to claim 1, wherein the method comprises the following steps: the chloride in the seawater salt comprises sodium chloride, potassium chloride and magnesium chloride.
5. The method for denitrifying the water body gushed into the sea mouth of the river according to claim 1, wherein the method comprises the following steps: the electrodes comprise positive electrodes and negative electrodes, and are respectively connected with the positive electrodes and the negative electrodes of the rectifier transformer through leads or buses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110521979.7A CN113200632A (en) | 2021-05-13 | 2021-05-13 | Method for denitrifying water body entering estuary |
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| CN202110521979.7A CN113200632A (en) | 2021-05-13 | 2021-05-13 | Method for denitrifying water body entering estuary |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102105406A (en) * | 2008-07-24 | 2011-06-22 | 三星重工业(株) | Apparatus and method for treating ballast water |
| EP2657193A2 (en) * | 2012-04-24 | 2013-10-30 | Dinotec GmbH Wassertechnologie und Schwimmbadtechnik | Electrolysis assembly and method for operating the same |
| CN106746053A (en) * | 2017-01-17 | 2017-05-31 | 青岛双瑞海洋环境工程股份有限公司 | Sewage from Ships denitrifying method and system |
| CN107001077A (en) * | 2014-10-10 | 2017-08-01 | Xogen科技有限公司 | system and method for the oxidation of ammonia |
| CN107381892A (en) * | 2017-09-09 | 2017-11-24 | 南通意特化工有限公司 | A kind of handling process of high-concentration ammonia nitrogenous wastewater |
-
2021
- 2021-05-13 CN CN202110521979.7A patent/CN113200632A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102105406A (en) * | 2008-07-24 | 2011-06-22 | 三星重工业(株) | Apparatus and method for treating ballast water |
| EP2657193A2 (en) * | 2012-04-24 | 2013-10-30 | Dinotec GmbH Wassertechnologie und Schwimmbadtechnik | Electrolysis assembly and method for operating the same |
| CN107001077A (en) * | 2014-10-10 | 2017-08-01 | Xogen科技有限公司 | system and method for the oxidation of ammonia |
| CN106746053A (en) * | 2017-01-17 | 2017-05-31 | 青岛双瑞海洋环境工程股份有限公司 | Sewage from Ships denitrifying method and system |
| CN107381892A (en) * | 2017-09-09 | 2017-11-24 | 南通意特化工有限公司 | A kind of handling process of high-concentration ammonia nitrogenous wastewater |
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