CN111285536A - Device and method for recovering nitrogen and phosphorus in residual bait and excrement generated in aquaculture - Google Patents
Device and method for recovering nitrogen and phosphorus in residual bait and excrement generated in aquaculture Download PDFInfo
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- CN111285536A CN111285536A CN201811488377.0A CN201811488377A CN111285536A CN 111285536 A CN111285536 A CN 111285536A CN 201811488377 A CN201811488377 A CN 201811488377A CN 111285536 A CN111285536 A CN 111285536A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- 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
- C02F2101/105—Phosphorus compounds
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- 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
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
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Abstract
The invention relates to the field of aquaculture, and discloses a device and a method for recovering nitrogen and phosphorus in residual bait and excrement. In addition, the method comprises the steps of introducing the liquid to be treated containing the residual bait and the excrement into the device for recovering nitrogen and phosphorus in the residual bait and the excrement for purification, and recycling the water rich in nitrogen and phosphorus obtained after purification. The method and the device can effectively realize the degradation of the residual bait and excrement, and can recycle nitrogen and phosphorus in the residual bait and excrement to the maximum extent.
Description
Technical Field
The invention relates to the field of aquaculture, in particular to a device and a method for recovering nitrogen and phosphorus in residual bait and excrement.
Background
Accumulation and decomposition of residual baits and excrement in the high-density aquaculture process can cause water body pollution, destroy ecological balance, breed pathogenic bacteria and cause aquatic product virus and harm.
In 2013, in 4 months, the American soybean export Association introduced a low-carbon high-efficiency pond circulating flow water fish culture technology into the Chinese market, wherein excrement and residual bait generated in the culture process are sucked into a septic tank in a centralized manner and then are treated and discharged in a centralized manner, so that the influence on water quality is avoided, but in the actual operation and production process, the centralized treatment effect of waste is not obvious, and the sufficient recycling of nitrogen and phosphorus in the residual bait and the excrement cannot be achieved.
Therefore, the problem of low recycling rate of nitrogen and phosphorus in the residual bait and excrement generated in aquaculture needs to be solved in the field.
Disclosure of Invention
The invention aims to solve the problem of low cyclic utilization rate of nitrogen and phosphorus in residual bait and excrement generated by aquaculture in the prior art, and provides a method and a device for recovering nitrogen and phosphorus in residual bait and excrement, which can effectively realize degradation of residual bait and excrement and can maximally recycle nitrogen and phosphorus in residual bait and excrement.
The inventor of the present invention has found in research that the use of the apparatus of the present invention (the combined use of the sedimentation anaerobic tank, the facultative anaerobic tank, the aerobic tank and the activated carbon adsorption tank) can reduce BOD, COD values and heavy metals in purified nitrogen and phosphorus-rich water and recycle nitrogen and phosphorus resources produced by aquaculture while improving the recycling rate of nitrogen and phosphorus in the residual bait produced by aquaculture and excrement, and further can further improve the treatment effect of the residual bait produced by aquaculture and excrement when the combination and the addition amount of specific anaerobic fermentation bacteria, facultative anaerobic microorganisms and aerobic microorganisms are used.
In order to achieve the above objects, the present invention provides, in one aspect, an apparatus for recovering nitrogen and phosphorus from residual baits and excrements, comprising a sedimentation anaerobic tank, a facultative tank, an aerobic tank and an activated carbon adsorption tank which are sequentially communicated, for recovering nitrogen and phosphorus contained in the residual baits and excrements produced by aquaculture.
The invention also provides a method for recovering nitrogen and phosphorus in residual bait and excrement, which comprises the steps of introducing the liquid to be treated containing the residual bait and the excrement into the device for recovering nitrogen and phosphorus in the residual bait and the excrement for purification, and recycling the water rich in nitrogen and phosphorus obtained after purification.
Through the technical scheme, the water rich in nitrogen and phosphorus can be obtained, the BOD value (biochemical oxygen demand) in the water can be below 5mg/L, and the COD value (chemical oxygen demand) in the water can be below 20mg/L, so that nitrogen and phosphorus in the residual bait and excrement can be recycled.
Drawings
FIG. 1 is a plan view of an apparatus for recovering nitrogen and phosphorus from remnant baits and excrements;
fig. 2 is a front view of the apparatus for recovering nitrogen and phosphorus from the residual baits and excrements.
Description of the reference numerals
1 sedimentation anaerobic tank, 2 facultative tank, 3 aerobic tank, 4 activated carbon adsorption tank
5 inlet 6 stirring paddle 7 sewage outlet 8 first clapboard
9 baffle 10, 11 second baffle, 11 aeration pipe 12 and third baffle
13 outlet of activated carbon adsorption layer 14
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In one aspect, the present invention provides a device for recovering nitrogen and phosphorus from residual bait and excrement produced by aquaculture, as shown in fig. 1 and 2, the device comprises a sedimentation anaerobic tank 1, a facultative tank 2, an aerobic tank 3 and an activated carbon adsorption tank 4 which are sequentially communicated, and is used for recovering nitrogen and phosphorus contained in the residual bait and excrement produced by aquaculture.
In the invention, the sedimentation anaerobic tank 1 is connected with the facultative tank 2 through a first partition plate 8, the facultative tank 2 is connected with the aerobic tank 3 through a second partition plate 10, and the aerobic tank 3 is connected with the activated carbon adsorption tank 4 through a third partition plate 12.
In the invention, the sedimentation anaerobic tank 1 is also provided with a stirring paddle 6, the bottom of the sedimentation anaerobic tank is conical, the center of the bottom is provided with a drain outlet 7, and the drain outlet 7 is preferably funnel-shaped, thereby being more beneficial to discharging sediment.
In the present invention, the facultative tank 2 is further provided with baffles 9, and preferably, the facultative tank 2 comprises at least two baffles 9 which are perpendicular to the flow direction of the fluid in the device and are arranged at intervals, and the different baffles 9 are connected to the two side walls in the facultative tank 2 in a staggered manner, so that the fluid flows in the facultative tank 2 in a zigzag manner.
More preferably, the facultative tank 2 includes at least four baffles 9 (shown in fig. 1) spaced apart and perpendicular to the direction of fluid flow in the apparatus.
In the present invention, the staggered connection (as shown in fig. 1) means that when one baffle plate of the baffle plates 9 is hermetically connected to one of the side walls in the facultative tank 2, another adjacent baffle plate of the baffle plates 9 is hermetically connected to the other side wall in the facultative tank 2, and the other baffle plates are sequentially and respectively connected to the two side walls in the facultative tank 2 according to the connection manner of the two baffle plates.
In the present invention, the length of the baffle 9 is less than the width of the facultative tank 2 and greater than 1/2 of the width of the facultative tank 2, the height of the baffle 9 is equal to the height of the facultative tank 2, and the height of the baffle 9 when the fluid flows is lower than the height of the facultative tank, the bottom of the baffle 9 is in sealed contact with the bottom of the facultative tank, so that the fluid can flow in the baffle 9 in a left-right zigzag manner in the horizontal direction.
In the present invention, the interval between the baffles 9, the material of the baffles 9, and the thickness of the baffles 9 are not particularly limited as long as the fluid can flow in a zigzag manner in the facultative tank 2.
In the invention, the fluid flows in the baffle 9 of the facultative tank in a left-right zigzag mode in the horizontal direction, so that the mixing of the fluid in the facultative tank 9 can be effectively promoted, the impact action of the fluid generated in the baffle 9 is reduced, and the growth of facultative anaerobes and the treatment effect enhancement are facilitated. However, if the fluid flows vertically up and down in the baffle 9, the impact of the fluid on the baffle 9 is large, which is not favorable for growth of facultative anaerobes and affects the fluid treatment effect.
In the present invention, the aerobic tank 3 is further provided with an aeration pipe 11, the aeration pipe 11 is located at the bottom of the aerobic tank 3 to provide sufficient oxygen for aerobic microorganisms, the time for aeration of the aeration pipe 11 is not particularly limited as long as the oxygen content in the aerobic tank is 1500-3000mg/L, for example, the aeration time per day is 3-5 h.
In the invention, a first filler is also arranged in the sedimentation anaerobic tank, a second filler is also arranged in the facultative tank, and a third filler is also arranged in the aerobic tank.
In the invention, the first filler can be loaded with anaerobic fermentation bacteria, the second carrier can be loaded with facultative anaerobic microorganisms, and the third filler can be loaded with aerobic microorganisms.
In the present invention, the types of the first filler, the second filler and the third filler are not particularly limited, and may be conventional, for example, the first filler, the second filler and the third filler may each be at least one selected from the group consisting of a composite filler, a three-dimensional elastic filler, a porous suspension sphere filler and an active biological filler.
In the present invention, the nutrient medium of the first, second and third filling may be a fluid in the device, for example, waste water from aquaculture containing residual bait and manure.
In the invention, at least two active carbon adsorption layers 13 (distributed at intervals up and down) are arranged in the active carbon adsorption tank 4, the active carbon adsorption layers 13 are parallel to the bottom of the active carbon adsorption tank 4, active carbon is arranged on the active carbon adsorption layers 13, and the particle size of the active carbon is 1-5 mm.
The invention provides a method for recovering nitrogen and phosphorus in residual bait and excrement and urine, which comprises the steps of introducing water containing the residual bait and the excrement and urine into the device for recovering the nitrogen and the phosphorus in the residual bait and the excrement and urine for purification, and recycling the water rich in the nitrogen and the phosphorus obtained after purification.
In the invention, the method for recovering nitrogen and phosphorus in the residual bait and excrement further comprises the following steps:
(1) introducing the liquid to be treated containing the residual bait and the excrement into a precipitation anaerobic tank 1, and carrying out hydrolytic acidification pretreatment by anaerobic fermentation bacteria to obtain a treated liquid-I;
(2) introducing the treatment liquid-I into a facultative tank 2, and carrying out denitrification and degradation reaction by facultative anaerobes to obtain a treatment liquid-II;
(3) introducing the treatment liquid-II into an aerobic tank 3, and carrying out biochemical reaction by aerobic microorganisms to obtain treatment liquid-III;
(4) and (3) introducing the treatment solution-III into an activated carbon adsorption tank 4, and performing activated carbon adsorption to obtain water rich in nitrogen and phosphorus for recycling.
In the present invention, the liquid to be treated is aquaculture water containing residual baits and excrements, wherein the dry matter content of the residual baits and the excrements can be 0.01 to 10 wt%.
In the present invention, the amount of the anaerobic fermentation bacteria added is preferably 0.5 to 1%, more preferably 0.6 to 0.8% of the volume of the sedimentation anaerobic tank 1.
In the present invention, the amount of the facultative anaerobic microorganisms added is preferably 0.1 to 1%, more preferably 0.6 to 0.8%, of the volume of the facultative tank 2.
In the present invention, the amount of the aerobic microorganisms added is preferably 0.1 to 0.3%, more preferably 0.15 to 0.25% of the volume of the aerobic tank 3.
In the present invention, the amount of the added activated carbon is preferably 20 to 70%, more preferably 40 to 60%, of the volume of the activated carbon adsorption tank 4.
In the present invention, the thickness of the activated carbon on the activated carbon adsorption layer 13 may be 0.5 to 3.6m, preferably 1.0 to 2.0 m.
In the invention, the anaerobic fermentation bacteria can be added into the sedimentation anaerobic tank 1 in a mode of taking a first filler as a carrier, the first filler can be suspended in the sedimentation anaerobic tank 1, and the anaerobic fermentation bacteria are fully contacted with water containing residual baits and excrement under the action of the stirring paddle 6.
In the present invention, the facultative anaerobic microorganisms may be introduced into the facultative tank 2 in such a manner that the second filler, which may be suspended in the facultative tank 2 and/or fixed to the surface of the baffle plate 9 (the surface perpendicular to the fluid flow direction), is used as a carrier, and preferably, the second filler is fixed to the surface of the baffle plate 9 so that the treatment liquid-I can sufficiently contact the facultative anaerobic microorganisms when passing through the baffle plate 9.
In the present invention, the aerobic microorganisms may be added to the aerobic tank 3 in a manner that a third filler is used as a carrier, and the third filler may be suspended in the aerobic tank 3.
In the invention, in the step (1), the liquid to be treated containing the residual bait and the excrement is introduced into a precipitation anaerobic tank 1 through an inlet 5, the residual bait and macromolecular organic matters (such as polysaccharide, starch, cellulose and hydrocarbon) in the excrement are hydrolyzed and acidified into micromolecular organic compounds, carbon dioxide and hydrogen by using anaerobic fermentation bacteria, and the hydrolyzed and acidified liquid is precipitated to obtain a treated liquid I and a solid precipitate, wherein the treated liquid I is introduced into a facultative tank 2 through a first partition plate 8, the solid precipitate is discharged out of the precipitation anaerobic tank 1 through a sewage discharge outlet 7, so that the COD (chemical oxygen demand) value in the precipitation anaerobic tank 1 is reduced to be below 20mg/L (meeting the fishery water discharge standard), and the BOD value (biochemical oxygen demand) is reduced to be below 5mg/L (meeting the standard of surface water III).
In the present invention, in the step (2), the treatment liquid-I flows in the facultative tank 2 in a baffled manner, and the contact area and the contact time of the small molecule organic compound in the treatment liquid-I with the facultative anaerobic microorganisms can be increased, thereby increasing the degradation of the small molecule organic compound.
In the invention, the small molecular organic compound in the treatment liquid-I can be used as a carbon source, a nitrogen source, a phosphorus source and an energy source of the facultative anaerobe, and the facultative anaerobe can perform denitrification and degradation reaction on the small molecular organic compound to remove part of nitrate nitrogen and phosphate in the treatment liquid-I to obtain the treatment liquid-II.
In the invention, the treatment liquid-II is introduced into the aerobic tank 3 through the second partition plate 10, and after biochemical reaction with aerobic microorganisms, part of toxic nitrite is converted into nitrate to obtain the treatment liquid-III, wherein an aeration pipe 11 arranged at the bottom of the aerobic tank 3 provides sufficient oxygen for the aerobic microorganisms.
In the invention, the treatment solution-III also contains heavy metals such as Cu, Zn and Fe, the treatment solution-III is introduced into the activated carbon adsorption tank 4 through the third partition plate 12, the activated carbon can further adsorb heavy metal ions in the treatment solution-III to obtain purified water rich in nitrogen and phosphorus, and the purified water rich in nitrogen and phosphorus is discharged through the outlet 14 at the bottom of the activated carbon adsorption tank 4 and recycled.
In the present invention, the anaerobic fermentative bacteria may be at least one selected from the group consisting of Clostridium, Bacteroides, Vibrio butyricum, Z., and Bifidobacterium, preferably the genus Bifidobacterium.
Preferably, the bifidobacterium is selected from at least one of bifidobacterium, bifidobacterium bifidum, bifidobacterium longum and bifidobacterium breve, lactobacillus acidophilus, lactobacillus casei, streptococcus thermophilus and lactobacillus bulgaricus.
In the invention, based on 100 parts by weight of bifidobacterium, the content of the lactobacillus acidophilus is 1-60 parts by weight, preferably 5-50 parts by weight, the content of the lactobacillus casei is 5-80 parts by weight, preferably 10-40 parts by weight, the content of the streptococcus thermophilus is 1-30 parts by weight, preferably 5-25 parts by weight, and the content of the lactobacillus bulgaricus is 10-50 parts by weight, preferably 10-30 parts by weight.
In the present invention, the facultative anaerobic microorganism is at least one selected from the group consisting of denitrifying bacillus, escherichia coli, bacillus licheniformis, bacillus megaterium, clostridium, stewartia, and firefly aerothrix.
Preferably, the facultative anaerobic microorganism is a composite facultative anaerobic microorganism of denitrifying bacillus, escherichia coli, bacillus licheniformis, bacillus megaterium, and clostridium.
In the invention, based on 100 parts by weight of denitrifying bacillus, the content of the escherichia coli is 5-40 parts by weight, preferably 10-30 parts by weight, the content of the bacillus licheniformis is 20-80 parts by weight, preferably 30-60 parts by weight, the content of the bacillus megaterium is 1-30 parts by weight, preferably 5-25 parts by weight, and the content of the clostridium is 5-70 parts by weight, preferably 10-60 parts by weight.
In the present invention, the aerobic microorganism may be at least one selected from the group consisting of chemoautotrophic bacteria, acetic acid bacteria, bacillus subtilis, nitrite bacteria, nitrate bacteria, and nitrogen-fixing bacteria.
Preferably, the aerobic microorganism is a composite aerobic microorganism of autotrophic bacteria, acetic acid bacteria, nitrite bacteria, nitrate bacteria and azotobacter.
In the invention, based on 100 parts by weight of nitrite bacteria, the content of autotrophic bacteria is 20-60 parts by weight, preferably 25-40 parts by weight, the content of acetic acid bacteria is 1-30 parts by weight, preferably 5-20 parts by weight, the content of nitrite bacteria is 10-40 parts by weight, preferably 15-35 parts by weight, the content of nitrate bacteria is 20-50 parts by weight, preferably 25-40 parts by weight, and the content of azotobacter is 1-70 parts by weight, preferably 10-40 parts by weight.
In the present invention, the sources of the anaerobic fermentation bacteria, the facultative anaerobes, and the aerobes are not particularly limited, and may be commercially available or obtained by culturing according to a conventional technique.
The present invention will be described in detail below by way of examples.
In the following examples of the present invention,
BOD parameter passes through HJ 505 plus 2009 water quality five-day Biochemical Oxygen Demand (BOD)5) The measurement of the dilution and inoculation method (1) is carried out by a dilution method;
COD parameters are measured by a method of a dichromate determination method for chemical oxygen demand of water quality GB 11914 and 1989;
the total phosphorus content parameter is measured by the method of GB/T11893-1989 ammonium molybdate spectrophotometry for measuring total phosphorus in water;
the total nitrogen content parameter is measured by the method of GB/T11894-1989 method for measuring the total nitrogen of water quality by alkaline potassium persulfate digestion ultraviolet spectrophotometry;
the iron content parameter is measured by the method of GB/T11911-1989 flame atomic spectrophotometry for measuring the water quality of iron and manganese;
the copper content parameter is measured by the method of GB/T7474-1987 sodium diethyldithiocarbamate spectrophotometry for measuring copper in water;
the zinc content parameter is measured by the method of GB/T7472-1987 Dithiohydrazone spectrophotometry for measuring zinc in water.
Example 1
(1) Introducing a liquid to be treated containing residual bait and excrement into a precipitation anaerobic tank 1 (shown in figure 1), wherein the introduction amount is 528L/min, and performing hydrolytic acidification pretreatment by using bifidobacterium (the components and the content are shown in table 1) to obtain a treatment liquid I, wherein the addition amount of the bifidobacterium (taking a three-dimensional elastic filler as a carrier) accounts for 0.6% of the volume of the precipitation anaerobic tank 1;
(2) introducing the treatment liquid-I into a facultative tank 2 (the number of baffles is 10), and carrying out denitrification and degradation reaction by facultative anaerobes (the components and the content are shown in Table 1) to obtain a treatment liquid-II, wherein the adding amount of the facultative anaerobes (taking the combined filler as a carrier) accounts for 0.6% of the volume of the facultative tank 2 (the combined filler is fixed on the surfaces of the baffles, and the combined filler is fixed on both surfaces of each baffle);
(3) introducing the treatment liquid-II into an aerobic tank 3, and carrying out biochemical reaction by aerobic microorganisms (the components and the content are shown in table 1) to obtain treatment liquid-III, wherein the adding amount of the aerobic microorganisms (taking active biological fillers as carriers) accounts for 0.15% of the volume of the aerobic tank 3;
(4) and (3) introducing the treatment solution-III into an activated carbon adsorption tank 4, and adsorbing by activated carbon, wherein the adding amount of the activated carbon accounts for 40% of the volume of the activated carbon adsorption tank 4 (the activated carbon adsorption layers are two, and the thickness of each layer is 1.5m), so as to obtain water rich in nitrogen and phosphorus and recycle the water.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 2
(1) Introducing a liquid to be treated containing residual bait and excrement into a precipitation anaerobic tank 1 (shown in figure 1), wherein the introduction amount is 528L/min, and performing hydrolytic acidification pretreatment by using bifidobacterium (the components and the content are shown in table 1) to obtain a treatment liquid I, wherein the adding amount of the bifidobacterium (taking porous suspension ball filler as a carrier) accounts for 0.8% of the volume of the precipitation anaerobic tank 1;
(2) introducing the treatment liquid-I into a facultative tank 2 (the number of baffles is 6), and carrying out denitrification and degradation reaction by facultative anaerobes (the components and the content are shown in Table 1) to obtain a treatment liquid-II, wherein the adding amount of the facultative anaerobes (the combined filler is used as a carrier) accounts for 0.7% of the volume of the facultative tank 2 (the combined filler is fixed on the surfaces of the baffles, and the combined filler is fixed on both surfaces of each baffle);
(3) introducing the treatment liquid-II into an aerobic tank 3, and carrying out biochemical reaction by aerobic microorganisms (the components and the content are shown in table 1) to obtain treatment liquid-III, wherein the adding amount of the aerobic microorganisms (taking active biological fillers as carriers) accounts for 0.2% of the volume of the aerobic tank 3;
(4) and (3) introducing the treatment solution-III into an activated carbon adsorption tank 4, and adsorbing by activated carbon, wherein the adding amount of the activated carbon accounts for 60% of the volume of the activated carbon adsorption tank 4 (the activated carbon adsorption layer is three layers, and the thickness of each layer is 1m), so as to obtain water rich in nitrogen and phosphorus and recycle the water.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 3
(1) Introducing a liquid to be treated containing residual bait and excrement into a precipitation anaerobic tank 1 (shown in figure 1), wherein the introduction amount is 528L/min, and performing hydrolytic acidification pretreatment by using bifidobacterium (the components and the content are shown in table 1) to obtain a treatment liquid I, wherein the addition amount of the bifidobacterium (taking a three-dimensional elastic filler as a carrier) accounts for 0.7% of the volume of the precipitation anaerobic tank 1;
(2) introducing the treatment liquid-I into a facultative tank 2 (the number of baffles is 4), and carrying out denitrification and degradation reaction by facultative anaerobes (the components and the content are shown in Table 1) to obtain a treatment liquid-II, wherein the adding amount of the facultative anaerobes (taking the combined filler as a carrier) accounts for 0.8% of the volume of the facultative tank 2 (the combined filler is fixed on the surfaces of the baffles, and the combined filler is fixed on both surfaces of each baffle);
(3) introducing the treatment liquid-II into an aerobic tank 3, and carrying out biochemical reaction by aerobic microorganisms (the components and the content are shown in table 1) to obtain a treatment liquid-III, wherein the adding amount of the aerobic microorganisms (taking active biological fillers as carriers) accounts for 0.25 percent of the volume of the aerobic tank 3;
(4) and (3) introducing the treatment solution-III into an activated carbon adsorption tank 4, and adsorbing by activated carbon, wherein the adding amount of the activated carbon accounts for 50% of the volume of the activated carbon adsorption tank 4 (the activated carbon adsorption layer is divided into two layers, and the thickness of each layer is 1m), so as to obtain water rich in nitrogen and phosphorus and recycle the water.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 4
The liquid to be treated containing the residual baits and excrements was treated in the same manner as in example 1 except that the stirring paddle 6 was not provided in the precipitation anaerobic tank 1.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 5
A liquid to be treated containing both residual baits and excrements was treated in the same manner as in example 1 except that the number of baffles in the facultative tank 2 was three.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 6
The liquid to be treated containing the remnant feeds and excrements was treated in the same manner as in example 1, except that the aeration pipe 11 was not provided in the aerobic tank 3.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 7
A liquid to be treated containing a residual bait and excrements was treated in the same manner as in example 1, except that the activated carbon adsorption layer 13 in the activated carbon adsorption cell 4 was a single layer having a thickness of 2.0 m.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 8
The liquid to be treated containing the remnant feed and excrements was treated in the same manner as in example 1 except that the Bifidobacterium was added in an amount of 0.5% by volume of the sedimentary anaerobic tank 1.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 9
A liquid to be treated containing a remnant and excrements was treated in the same manner as in example 1, except that the amount of the facultative anaerobic microorganisms added was 0.1% by volume of the facultative tank 2.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 10
The liquid to be treated containing the residual baits and excrements was treated in the same manner as in example 1 except that the amount of the aerobic microorganisms added was 0.1% by volume of the aerobic tank 2.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 11
The liquid to be treated containing the residual baits and excrements was treated in the same manner as in example 1 except that the combined packing was suspended in the facultative anaerobic tank 2.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 12
The liquid to be treated containing the residual bait and feces was treated in the same manner as in example 1, except that the content of the bacterial species in the genus Bifidobacterium was adjusted as shown in Table 1.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 13
A liquid to be treated containing a residual bait and feces was treated in the same manner as in example 1, except that the content of the bacterial species in the facultative anaerobic microorganisms was adjusted as shown in Table 1.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 14
A liquid to be treated containing a residual bait and feces was treated in the same manner as in example 1 except that the seed content of aerobic microorganisms was adjusted.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 15
The liquid to be treated containing the remnant bait and feces was treated in the same manner as in example 1 except that the length of the baffle was equal to 1/2 of the width of the facultative tank.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 16
A liquid to be treated containing residual baits and excrements was treated in the same manner as in example 1 except that the concentration of the residual baits and excrements in the liquid to be treated was 15% by weight.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Example 17
The liquid to be treated containing the residual bait and the feces was treated in the same manner as in example 1 except that the anaerobically fermenting bacteria were bifidobacteria.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Comparative example 1
A liquid to be treated containing residual baits and excrements was treated in the same manner as in example 1 except that the baffle 9 was not provided in the facultative tank 2.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Comparative example 2
A liquid to be treated containing residual baits and excrements was treated in the same manner as in example 1 except that the apparatus for recovering nitrogen and phosphorus from the residual baits and excrements did not include the activated carbon adsorption tank 4.
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
Comparative example 3
The liquid to be treated containing the remnant bait and feces was treated in the same manner as in example 1 except that the baffle 9 in the facultative tank was replaced with an ABR baffle plate (number of compartments: 4).
The COD, BOD, total nitrogen and total phosphorus contents of the liquid to be treated and the water rich in nitrogen and phosphorus were determined, and the results are shown in tables 2 and 3, respectively.
TABLE 1
TABLE 2
TABLE 3
As can be seen from the results in Table 1, the device and the method for recovering the total nitrogen and the total phosphorus in the residual baits and the excrements in the invention have obviously better effect on the liquid to be treated containing the residual baits and the excrements, and the BOD value, the COD value and the heavy metal content of the obtained water rich in nitrogen and phosphorus are obviously reduced, wherein the content of the total nitrogen is more than 10mg/L, and the content of the total phosphorus is more than 1.5mg/L, so that the aim of recycling can be achieved.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The utility model provides a retrieve device of nitrogen and phosphorus in incomplete bait that aquaculture produced and excrement and urine, the device is including the sediment anaerobism pond, facultative anaerobic pond, good oxygen pond and the active carbon adsorption pond that communicate in proper order for retrieve nitrogen and phosphorus that contain in the incomplete bait that aquaculture produced and excrement and urine.
2. The apparatus of claim 1, wherein the facultative tank includes at least two baffles spaced apart from and perpendicular to the direction of fluid flow in the apparatus, different baffles being connected alternately to the side walls of the interior of the facultative tank to cause the fluid to flow in a zigzag manner in the facultative tank.
3. The apparatus of claim 1 wherein the length of the baffle is less than the width of the facultative tank and greater than 1/2 of the width of the facultative tank, and the height of the baffle is equal to the height of the facultative tank.
4. The device as claimed in claim 1, wherein the top of the sedimentation anaerobic tank is provided with a stirring paddle, and the bottom center is provided with a sewage draining outlet.
5. The device of claim 1, wherein at least two activated carbon adsorption layers are arranged in the activated carbon adsorption tank, and the activated carbon adsorption layers are parallel to the bottom of the activated carbon adsorption tank.
6. A method for recovering nitrogen and phosphorus from residual baits and excrements produced in aquaculture, which comprises introducing a liquid to be treated containing the residual baits and the excrements into the device for recovering nitrogen and phosphorus from the residual baits and the excrements produced in aquaculture, according to any one of claims 1 to 5, purifying the liquid, and recycling the water rich in nitrogen and phosphorus obtained after purification.
7. The method of claim 6, wherein the method further comprises the steps of:
(1) introducing the liquid to be treated containing the residual bait and the excrement into a precipitation anaerobic tank, and carrying out hydrolytic acidification pretreatment by anaerobic fermentation bacteria to obtain a treated liquid-I;
(2) introducing the treatment liquid-I into a facultative tank, and carrying out denitrification and degradation reaction by facultative anaerobes to obtain a treatment liquid-II;
(3) introducing the treatment liquid-II into an aerobic tank, and performing biochemical reaction by aerobic microorganisms to obtain treatment liquid-III;
(4) and (3) introducing the treatment solution-III into an activated carbon adsorption tank, and performing activated carbon adsorption to obtain water rich in nitrogen and phosphorus for recycling.
8. The method of claim 7, wherein,
the adding amount of the anaerobic fermentation bacteria accounts for 0.5-1%, preferably 0.6-0.8% of the volume of the sedimentation anaerobic tank;
the adding amount of the facultative anaerobe accounts for 0.1-1%, preferably 0.6-0.8% of the volume of the facultative tank;
the adding amount of the aerobic microorganisms accounts for 0.1-0.3 percent of the volume of the aerobic pool, and preferably 0.15-0.25 percent.
9. The method of claim 7, wherein the anaerobic fermentation bacteria are added to the sedimentation anaerobic tank in a manner that the first filler is used as a carrier, the facultative anaerobic microorganisms are fixed to the surface of the baffle plate in a manner that the second filler is used as a carrier, and the facultative anaerobic microorganisms are added to the facultative tank, and the aerobic microorganisms are added to the aerobic tank in a manner that the third filler is used as a carrier.
10. The method of claim 7, wherein,
the anaerobic fermentation bacteria are selected from at least one of the genera Clostridium, Bacteroides, Vibrio butyricum, Z.mutilans, A.fusobacterium and Bifidobacterium.
The facultative anaerobe is at least one selected from denitrifying bacillus, escherichia coli, bacillus licheniformis, bacillus megaterium, clostridium, stewartia and firefly aerothrix.
The aerobic microorganism is at least one of chemoautotrophic bacteria, acetic acid bacteria, bacillus subtilis, nitrite bacteria, nitrate bacteria and azotobacter.
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