CN110002666A - Nitration denitrification circulating water treatment method - Google Patents
Nitration denitrification circulating water treatment method Download PDFInfo
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- CN110002666A CN110002666A CN201910228574.7A CN201910228574A CN110002666A CN 110002666 A CN110002666 A CN 110002666A CN 201910228574 A CN201910228574 A CN 201910228574A CN 110002666 A CN110002666 A CN 110002666A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000006396 nitration reaction Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 15
- 230000001376 precipitating effect Effects 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 206010002660 Anoxia Diseases 0.000 claims abstract description 7
- 241000976983 Anoxia Species 0.000 claims abstract description 7
- 206010021143 Hypoxia Diseases 0.000 claims abstract description 7
- 230000007953 anoxia Effects 0.000 claims abstract description 7
- 238000000926 separation method Methods 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 239000012620 biological material Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 10
- 238000009287 sand filtration Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 230000000737 periodic effect Effects 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000009360 aquaculture Methods 0.000 abstract description 16
- 244000144974 aquaculture Species 0.000 abstract description 16
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 abstract description 10
- 231100000572 poisoning Toxicity 0.000 abstract description 8
- 230000000607 poisoning effect Effects 0.000 abstract description 8
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 abstract description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 244000000010 microbial pathogen Species 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
-
- 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
-
- 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
- C02F2101/166—Nitrites
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses nitration denitrification circulating water treatment methods, comprising the following steps: the water flow being subject to processing passes through the denitrification chamber for being adjusted to anoxia condition；The water flow being subject to processing passes through the nitrification chamber for being adjusted to aerobic environment；The water flow being subject to processing is realized by precipitating chamber and is separated by solid-liquid separation；The water flow being subject to processing realizes that pH value is adjusted by adjusting cavity；The water flow being subject to processing is by disinfection treatment.The utility model has the advantages that water flow passes through the denitrification chamber of anoxia condition, nitrate nitrogen level can be reduced, is conducive to reduce murder by poisoning of the nitrate nitrogen to aquaculture organism.Water flow passes through the nitrification chamber of aerobic conditions, advantageously reduces the ammonia nitrogen and nitrite nitrogen level of high bio-toxicity in aquaculture discharge.Water flow is conducive to reduce turbidity by being separated by solid-liquid separation.Water flow is adjusted by pH value, can improve acid-base property.Water flow is conducive to reduce murder by poisoning of the pathogenic microorganisms to aquaculture organism by disinfection treatment.The present invention relates to method for treating water.
Description
Technical field
The present invention relates to method for treating water, in particular to nitration denitrification circulating water treatment method.
Background technique
As aquaculture is developed from traditional extensive flowing water culture mode to high density, intensive aquaculture model,
The problems such as aquaculture scale and yield are increasingly soaring, and consequent cultivation pollution of area source, the farming disease harms increase is increasingly serious.
Traditional circulating water cultivation water treatment system removes residual bait excrement etc. by physical methods such as mechanical filter, air bearings
After particulate matter, using the metabolism of microorganism by the dissolubilities inorganic nitrogen such as the ammonia nitrogen of high bio-toxicity, nitrite nitrogen
It is converted to low bio-toxicity nitrate nitrogen.The technological deficiency of traditional circulating water cultivation water treatment system is: carbon source lacks, and is
Uniting, denitrification efficiency is low, and nitrate nitrogen constantly accumulates in system, and the nitrate nitrogen of high concentration may generate murder by poisoning to aquaculture organism
Effect.
Using the water treatment system of the intensified anti-nitrated denitrogenation of regular additional carbon, technological deficiency is: carbon source demand amount
Greatly, cost of water treatment is caused to greatly increase.To guarantee economic benefit of aquaculture, finally often nitrate must be solved by changing water
Nitrogen accumulates problem, it is difficult to realize cultivation water circulation use truly.
In aquaculture process, feeds feed and be often discharged into breeding water body in the form of excrement and other metabolites, this
Class solid waste biodegradability is good, can be decomposed by the microorganisms utilization, and the endogenous carbon source as denitrification denitrogenation.
COD (Chemical Oxygen Demand, abbreviation COD), referring to chemically to measure needs in water sample
The amount for the reducing substances to be oxidized, in waste water, wastewater treatment plant effluent and contaminated water, referring to can be by strong oxidizer oxygen
The oxygen equivalent of the substance of change.
Dissolved oxygen (Dissolved Oxygen, abbreviation DO), refers to the amount for being dissolved in oxygen in water, with oxygen in every liter of water
Milligram number indicates.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of nitration denitrification circulating water treatment methods, can pass through anti-nitre
The technical issues of changing and nitrifying to solve nitrate nitrogen accumulation, in conjunction with acid-base accommodation, sand filtration and disinfecting process, to realize aquatic products
Discharge cycle is cultivated to utilize.
Used technical solution to solve above-mentioned technical problem:
Nitration denitrification circulating water treatment method, comprising the following steps:
The water flow being subject to processing passes through the denitrification chamber for being adjusted to anoxia condition；
The water flow being subject to processing passes through the nitrification chamber for being adjusted to aerobic environment；
The water flow being subject to processing is realized by precipitating chamber and is separated by solid-liquid separation；
The water flow being subject to processing realizes that pH value is adjusted by adjusting cavity；
The water flow being subject to processing is by disinfection treatment.
As an improvement, denitrification chamber decompose using in the water flow being subject to processing residual bait or excrement as the carbon of anti-nitration reaction
Source.
As an improvement, denitrification is intracavitary to be filled with biological material, denitrification chamber it is decomposable using biological material as
The carbon source of anti-nitration reaction.
As an improvement, periodically the substance of discharge precipitating chamber bottom deposit, tap-off cycle are three hours to eight hours.
As an improvement, acid unit and the alkalinity of adjusting is arranged in adjusting cavity adjusts unit, adjusts in unit and set in acidity
Acidic buffer is set, is adjusted in unit in alkalinity and alkaline buffer is set, by injecting acidic buffer into the water flow being subject to processing
Liquid and alkaline buffer adjust pH value.
Metering pump is respectively set on unit and alkalinity adjusting unit as an improvement, adjusting in acidity.
As an improvement, being irradiated using ultra violet sterilizer to the water flow being subject to processing in disinfection treatment step.
As an improvement, carry out sand filtration processing before the processing that carries out disinfection, sand filtration processing include make the water flow that is subject to processing by
It is lower to pass through water filtering cap, sand filter and grit interception unit toward Shangdi.
As an improvement, carrying out periodic flushing cleaning to sand filter, cleaning frequency is to carry out once for every two days to five days.
The utility model has the advantages that water flow passes through the denitrification chamber of anoxia condition, nitrate nitrogen level can be reduced, is conducive to reduce nitric acid
Murder by poisoning of the salt nitrogen to aquaculture organism.Water flow passes through the nitrification chamber of aerobic conditions, advantageously reduces high biology in aquaculture discharge
The ammonia nitrogen and nitrite nitrogen level of toxicity.Water flow is conducive to reduce turbidity by being separated by solid-liquid separation.Water flow passes through pH value tune
Section, can improve acid-base property.Water flow is conducive to reduce murder by poisoning of the pathogenic microorganisms to aquaculture organism by disinfection treatment.
Detailed description of the invention
Following further describes the present invention with reference to the drawings:
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the denitrification chamber of the embodiment of the present invention and the arrangement schematic diagram of nitrification chamber；
Fig. 3 is the denitrification chamber of the embodiment of the present invention and the stereoscopic schematic diagram of nitrification chamber；
Fig. 4 is the denitrification chamber of the embodiment of the present invention and the schematical top view of nitrification chamber；
Fig. 5 is the structural schematic diagram of the adjusting cavity of the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of the sand filter of the embodiment of the present invention.
Specific embodiment
Referring to figs. 1 to 6, nitration denitrification circulating water treatment method, comprising the following steps:
The water flow being subject to processing passes through the denitrification chamber 1 for being adjusted to anoxia condition；
The water flow being subject to processing passes through the nitrification chamber 2 for being adjusted to aerobic environment；
The water flow being subject to processing is realized by precipitating chamber 3 and is separated by solid-liquid separation；
The water flow being subject to processing realizes that pH value is adjusted by adjusting cavity 4；
The water flow being subject to processing is by disinfection treatment.
Water flow passes through the denitrification chamber 1 of anoxia condition, can reduce nitrate nitrogen level, is conducive to reduce nitrate nitrogen to feeding
Grow the murder by poisoning of biology.Water flow passes through the nitrification chamber 2 of aerobic conditions, advantageously reduces the ammonia of high bio-toxicity in aquaculture discharge
Nitrogen and nitrite nitrogen level.Water flow is conducive to reduce turbidity by being separated by solid-liquid separation.Water flow is adjusted by pH value, can be changed
Kind acid-base property.Water flow is conducive to reduce murder by poisoning of the pathogenic microorganisms to aquaculture organism by disinfection treatment.
Preferably, denitrification chamber 1 decompose using in the water flow being subject to processing residual bait or excrement as anti-nitration reaction
Carbon source.
Using be subject to processing aquaculture discharge in residual bait and excrement as endogenous carbon source, may advantageously facilitate denitrification
It reacts and reduces nitrate nitrogen level, to reduce the murder by poisoning to aquaculture organism.
Preferably, in denitrification chamber 1 be filled with biological material, denitrification chamber 1 decompose using biological material as
The carbon source of anti-nitration reaction.
The biological material of the present embodiment can be decomposed gradually, can be used as the slow-release supplementary carbon source of anti-nitration reaction.
The biological material of the present embodiment is rice husk, stalk or other organic-biological materials in the prior art.Pass through
Use biological material as the carbon source of anti-nitration reaction, biological material can be changed into organic fertilizer, is conducive to improve life
The utilization rate of material.The filling rate of biological material is the 50% to 80% of 1 volume of denitrification chamber, and filling rate appropriate has
Help improve denitrification effect.
Filler in the nitrification chamber 2 of the present embodiment is fixed Combination filler, and filling rate is the 50% of the volume of nitrification chamber 2
To 80%, horizontal dissolved oxygen (DO) is 2mg/L to 6mg/L.
Preferably, periodically the substance of discharge precipitating 3 bottom deposit of chamber, tap-off cycle are three hours to eight hours.
The bottom of the precipitating chamber 3 of the present embodiment is equipped with solenoid valve, can realize periodically discharge precipitating chamber 3 by controlling solenoid valve
Interior deposited material.
Preferably, acid unit 6 and the alkalinity of adjusting is arranged in adjusting cavity 4 adjusts unit 5, unit 6 is adjusted in acidity
Interior setting acidic buffer adjusts in unit 5 in alkalinity and alkaline buffer is arranged, acid by injecting into the water flow being subject to processing
Buffer and alkaline buffer adjust pH value.
The pH value of the water flow being subject to processing of the present embodiment is adjusted to pH7.0 between pH8.5.
Metering pump 7 is respectively set on unit 6 and alkalinity adjusting unit 5 preferably, adjusting in acidity.
Metering pump 7 may respectively be acid unit 6 and the alkalinity adjusting unit 5 of adjusting and provide power, and accurately calculate respectively sour
Property buffer and alkaline buffer dosage, be conducive to improve acid-base accommodation precision.
Preferably, being irradiated using ultra violet sterilizer 8 to the water flow being subject to processing in disinfection treatment step.
The disinfectant measure of the present embodiment is ultraviolet light.Other disinfections in the prior art also can be used in disinfection treatment step
Measure replaces.
Preferably, carry out sand filtration processing before the processing that carries out disinfection, sand filtration processing include make the water flow that is subject to processing by
It is lower to pass through water filtering cap 10, sand filter 9 and grit interception unit 11 toward Shangdi.
9 filled by filtration of sand filter of the present embodiment is casting bed.Other filtering schemes in the prior art also can be used in filtering ponds 9
Instead of.
Preferably, carrying out periodic flushing cleaning to sand filter 9, cleaning frequency is to carry out once for every two days to five days.
Periodic cleaning sand filter 9 it is even hardened to be beneficial to prevent the blocking of sand filter 9, it is ensured that sand filtration treatment efficiency.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned embodiment party
Formula, technical field those of ordinary skill within the scope of knowledge, can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (9)
1. nitration denitrification circulating water treatment method, it is characterised in that the following steps are included:
The water flow being subject to processing passes through the denitrification chamber for being adjusted to anoxia condition；
The water flow being subject to processing passes through the nitrification chamber for being adjusted to aerobic environment；
The water flow being subject to processing is realized by precipitating chamber and is separated by solid-liquid separation；
The water flow being subject to processing realizes that pH value is adjusted by adjusting cavity；
The water flow being subject to processing is by disinfection treatment.
2. nitration denitrification circulating water treatment method according to claim 1, it is characterised in that: the denitrification chamber decomposes
Using in the water flow being subject to processing residual bait or excrement as the carbon source of anti-nitration reaction.
3. nitration denitrification circulating water treatment method according to claim 1, it is characterised in that: the denitrification is intracavitary to be filled out
Filled with biological material, the denitrification chamber is decomposable using biological material as the carbon source of anti-nitration reaction.
4. nitration denitrification circulating water treatment method according to claim 1, it is characterised in that: the precipitating is periodically discharged
The substance of chamber bottom deposit, tap-off cycle are three hours to eight hours.
5. nitration denitrification circulating water treatment method according to claim 1, it is characterised in that: set in the adjusting cavity
It sets acid adjusting unit and alkalinity adjusts unit, acidic buffer is set in the acid adjusting unit, is adjusted in the alkalinity
It saves and alkaline buffer is set in unit, by injecting the acidic buffer and the alkaline buffer into the water flow being subject to processing
To adjust pH value.
6. nitration denitrification circulating water treatment method according to claim 5, it is characterised in that: single in the acid adjusting
The first and described alkalinity, which is adjusted, is respectively set metering pump on unit.
7. nitration denitrification circulating water treatment method according to claim 1, it is characterised in that: walked in the disinfection treatment
The water flow being subject to processing is irradiated using ultra violet sterilizer in rapid.
8. according to claim 1 to nitration denitrification circulating water treatment method described in 7 any one, it is characterised in that: into
Sand filtration processing is carried out before the row disinfection treatment, sand filtration processing is including making the water flow being subject to processing from lower to upper by drainage
Cap, sand filter and grit interception unit.
9. nitration denitrification circulating water treatment method according to claim 8, it is characterised in that: carried out to the sand filter
Periodic flushing cleaning, cleaning frequency are to carry out once for every two days to five days.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114956457A (en) * | 2022-05-26 | 2022-08-30 | 泉州南京大学环保产业研究院 | Industrial aquaculture circulating water denitrification process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956457A (en) * | 2022-05-26 | 2022-08-30 | 泉州南京大学环保产业研究院 | Industrial aquaculture circulating water denitrification process |
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Application publication date: 20190712 |