CN115626733A - Method for purifying and regenerating aquaculture wastewater - Google Patents

Method for purifying and regenerating aquaculture wastewater Download PDF

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CN115626733A
CN115626733A CN202211316112.9A CN202211316112A CN115626733A CN 115626733 A CN115626733 A CN 115626733A CN 202211316112 A CN202211316112 A CN 202211316112A CN 115626733 A CN115626733 A CN 115626733A
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wastewater
phosphorus
adsorption
filtration
adsorption tower
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谢世华
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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
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • 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
    • C02F2101/105—Phosphorus compounds
    • 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
    • C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention discloses a method for purifying and regenerating aquaculture wastewater, and belongs to the fields of resource recycling and environmental protection. The method mainly comprises five main processes of biochemical pond sedimentation and biochemistry of the culture wastewater, sand filtration of a water collecting well, oxidation, a filter and a filtration and adsorption tower, wherein the biochemical sedimentation mainly comprises the steps of removing excrement, COD (chemical oxygen demand), part of BOD (biochemical oxygen demand) ammonia nitrogen and total nitrogen, and converting organophosphorus part in the wastewater into phosphate radical; the oxidation mainly comprises the steps of further removing ammonia nitrogen in the wastewater and further converting organic phosphorus in the wastewater into phosphate radical; the filtration, adsorption and phosphorus removal is to adsorb phosphate radicals in the wastewater on a filter material, so that ammonia nitrogen in the treated water body is less than or equal to 1mg/L, and total phosphorus is less than or equal to 0.2mg/L; when the method is adopted to treat the aquaculture wastewater, the treatment cost is less than or equal to 0.25 yuan/ton, and the method has the advantages that: when the aquaculture wastewater is treated, only the wastewater flows through the filtering adsorption tower, and no special person is needed for operation and management, so that the operation is simple; no sludge is produced; over 90% of phosphorus resource can be recovered by desorbing, eluting and precipitating the phosphorus adsorbed on the adsorption filter material.

Description

Method for purifying and regenerating aquaculture wastewater
Technical Field
The invention belongs to the field of water resource recycling and environmental protection, and relates to a method for purifying and regenerating aquaculture wastewater.
Background
The aquaculture wastewater is a general term for the wastewater produced in the process of seawater and freshwater aquaculture, and its COD Cr About 20 to 80mg/L, BOD 5 About 5-30 mg/L of ammonia nitrogen, about 0.5-10 mg/L of ammonia nitrogen, about 1-15 mg/L of total nitrogen and about 0.5-8 mg/L of total phosphorus, and the main pollutants are COD Cr 、BOD 5 Ammonia nitrogen and total phosphorus. If the aquaculture wastewater is discharged directly to the environment, it will cause COD in the surrounding water and rivers Cr 、BOD 5 Nitrogen and phosphorus exceed standards, and water eutrophication occurs, so the aquaculture wastewater must be purified. COD in aquaculture wastewater Cr 、BOD 5 The treatment methods of ammonia nitrogen and total phosphorus comprise a physical method, a chemical method and a biochemical method. The physical method comprises the treatment technologies of nanofiltration, reverse osmosis, distillation, soil irrigation adsorption, ion exchange and the like; the chemical method comprises ammonia stripping, breakpoint chlorination, incineration, chemical precipitation, catalytic cracking, electrodialysis, electrochemical strong oxidation and other treatment technologies; the biological method comprises treatment technologies such as an activated sludge method, a biofilm method, algae cultivation and aquatic plant breeding (artificial wetland) and the like. Although the activated sludge process, the biofilm process and the artificial wetland are successful in the practice of sewage treatment and are widely applied to various urban sewage treatment and industrial wastewater treatment projects, the application to the aquaculture sewage treatment has no case or lacks of success. Due to COD in aquaculture wastewater Cr 、BOD 5 The carbon-nitrogen ratio is low, the carbon-nitrogen-phosphorus ratio is seriously imbalanced, a biochemical method or an artificial wetland is adopted, the investment is large, the occupied area is large, and a carbon source is continuously added during the operation, so that the treatment cost is high, and the operation effect is poor; when the total phosphorus is removed by adopting a precipitation method, the adding amount of the coagulant is up to 120-300 g/m 3 And a large amount of sludge is generated, the dephosphorization effect is poor, and the cost is up to 0.6 yuan/m 3 The above is not only technically difficult to achieve, but also economically prohibitive; in addition, the aquaculture water consumption is large, the water change is frequent, and if the water is not regenerated and recycled, a large amount of water resources are wastedAnd the water body with ten times of discharge amount is polluted due to the discharge of the breeding sewage. Therefore, with the development of aquaculture industry, an economical and practical sewage purification and regeneration device and method capable of realizing purification and recycling of aquaculture sewage are urgently needed.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for purifying and regenerating aquaculture wastewater.
The invention is realized by the following technical scheme: a method for purifying and regenerating aquaculture wastewater comprises the following steps:
(1) And (3) precipitation and biochemistry: the aquaculture wastewater is discharged into a biochemical pond 100, solid particles such as excrement, residual feed and the like in the wastewater are biochemically precipitated, and COD and BOD in the wastewater are oxidized into CO under the action of microorganisms 2 Converting organic phosphorus into inorganic acid radical;
(2) Sand filtration of a water collecting well 200: collecting the culture sewage subjected to biochemical precipitation in a wastewater collecting well 200 with sand filtration, and pumping the culture sewage into a reaction tank/tank 300 by a pump through a wastewater inlet pipe;
(3) And (3) oxidation: adding 20% sodium hydroxide solution according to 100-300 ml/L, adjusting the pH value of the wastewater to 7.5-8.8, synchronously adding 10-12% commercial sodium hypochlorite according to 50-200 ml/L, uniformly mixing, entering a reaction tank/tank 300 for oxidation reaction, and oxidizing ammonia nitrogen in the wastewater into nitrogen;
(4) And (3) filtering: pumping the oxidized wastewater into a filter 400, further filtering to remove tiny solid small particles in the wastewater, then flowing out of a water outlet of the filter 400, and entering a filtering adsorption tower 500;
(5) Filtering, adsorbing and removing phosphorus: the wastewater flows out from top to bottom, phosphate anions in the wastewater are adsorbed by the adsorbent to remove phosphorus in the wastewater, and the clear water after phosphorus removal is measured by a flowmeter through a water outlet of the filtering adsorption tower and then discharged into a natural water body;
after the phosphorus is removed by filtration and adsorption, the total phosphorus in the effluent is less than or equal to 0.1mg/L, and the phosphorus removal rate is 90-99.5%;
(6) Regeneration of the filtering and adsorbing filler: the total phosphorus concentration of the effluent is tracked and detected in time, and when the total phosphorus concentration of the effluent is close to a set value, the wastewater lift pump is closed, and then the water inlet of the filtration adsorption tower and the water outlet of the filtration adsorption tower are closed; opening a backwash liquid inlet of the filtration and adsorption tower, pumping a regeneration liquid (analytic liquid) into the filtration and adsorption tower by using a regeneration liquid conveying pump to reach a liquid level, carrying out backwashing regeneration for 60-90 minutes, eluting phosphate radicals adsorbed in the adsorption filler, and pumping the eluted regeneration liquid into a phosphorus recovery reaction tank (tank) by using a regeneration desorption liquid conveying pump at a backwash liquid outlet of the filtration and adsorption tower; after the desorption is finished, washing the adsorbent with clear water to be neutral, and finishing the regeneration of the adsorption filler;
(7) And (3) recovering phosphorus: adding a phosphorus precipitator into the backwashing desorption liquid pumped into the phosphorus recovery reaction tank (tank) 600, stirring for reaction, reacting phosphate radicals in the recovery liquid with calcium ions to generate calcium phosphate precipitate, injecting the backwashing desorption liquid after reaction into a phosphorus precipitation tank 620, performing precipitation separation, and drying to obtain recovered calcium phosphate;
the adsorption filler of the filtration adsorption tower is iron-based oxyhydroxide phosphorus adsorption special filler, and the bulk density of the adsorption filler is 0.40 kg/m 3 The adsorption capacity is 1 kg/m 3；
The thickness of the adsorption filler filled in the filtration adsorption tower is 1000-2000 mm;
the phosphorus precipitator is a clear saturated calcium hydroxide solution or a 5-25% calcium chloride solution.
The invention has the following beneficial effects:
1. the oxidation pond is mainly used for removing COD and BOD in a water body through oxidation and simultaneously precipitating and separating excrement and residual feed in sewage; the chemical strong oxidation mainly removes ammonia nitrogen in the wastewater and converts organic phosphorus in the wastewater into phosphate radical; the adsorption is to adsorb phosphate radicals in the wastewater on the filter material, so that the ammonia nitrogen in the treated water body is less than or equal to 1mg/L, and the total phosphorus is less than or equal to 0.1mg/L, and the desorption is to elute the filler after the adsorption is saturated, so that the adsorption function of the adsorption filler is recovered;
2. the purified effluent has high water quality and can be recycled: when the method is adopted to purify and regenerate the aquaculture wastewater, the quality of the purified effluent reaches the water quality of the earth surface III in the environmental quality Standard of surface Water (GB 3838-2002), and the effluent can be recycled as the aquaculture water;
3. the purification cost is low: when the method is adopted to purify and regenerate the aquaculture wastewater, the treatment cost is less than or equal to 0.25 yuan/ton, the treatment cost is low, and the purified water reaches the recycling standard and is used for recycling, and the cost is half lower than the cost for buying water, so that the recycling of water resources is greatly realized, and the cost of aquaculture water is reduced;
4. realizes the recovery of phosphorus resources, and has no sludge: in the purification process, phosphorus is adsorbed on a special filler for phosphorus adsorption, after saturation, the phosphorus is eluted and regenerated by using 0.5-1% of sodium hydroxide solution, the phosphorus is transferred into the sodium hydroxide solution, saturated lime water or calcium chloride is added into the sodium hydroxide solution, and phosphate radicals and calcium ions generate calcium phosphate precipitate, so that phosphorus resources are recovered, and the whole process has no sludge.
5. The operation is simple: when the invention is adopted to purify, regenerate and recycle the aquaculture wastewater, the whole process adopts PLC and artificial intelligence control, no special person is needed to operate and manage, and the operation is simple;
6. realizing the recycling of phosphorus resources: the phosphorus adsorbed on the adsorption filter material is desorbed and eluted, saturated lime water or calcium chloride is added into the desorption liquid, phosphate radicals and calcium ions generate calcium phosphate precipitate, and more than 90% of phosphorus resources can be recovered.
Description of the drawings:
FIG. 1 is a block diagram of the process of the present invention;
FIG. 2 is a schematic structural view of a biochemical pond according to the present invention;
FIG. 3 is a schematic view of the sump well structure of the present invention;
FIG. 4 is a schematic diagram of the adsorption and desorption of phosphorus by filtration;
FIG. 5 is a water quality meter for sewage treatment in example 1 of the present invention;
FIG. 6 is a water quality meter of the biochemical pond for the eel culture sewage according to the embodiment 1;
FIG. 7 is a water quality meter of the chemical oxidation tank oxidation water inlet and outlet indexes of the eel culture sewage in the embodiment 1 of the invention;
FIG. 8 is a water quality meter of the eel aquaculture sewage according to the invention, which is provided with the water inlet and outlet indexes of filter adsorption dephosphorization;
FIG. 9 is a water quality table showing the water inlet index and the water outlet standard-reaching index of the litopenaeus vannamei aquaculture sewage in example 2 of the present invention;
FIG. 10 is a water quality meter of water inlet and outlet indexes of a biochemical pond for penaeus vannamei boone culture sewage in embodiment 2 of the invention;
FIG. 11 is a water quality table of oxidation water inlet and outlet indexes of a chemical oxidation tank for Penaeus vannamei Boone aquaculture sewage in example 2 of the present invention;
FIG. 12 is a water inlet index water quality meter of bullfrog culture sewage to be treated in example 3 of the present invention;
FIG. 13 is a water quality table of water inlet and outlet indexes of bullfrog culture sewage in example 3 of the present invention;
FIG. 14 is a water quality meter of the biochemical pond inlet and outlet water index of the bullfrog breeding sewage in embodiment 3 of the invention;
FIG. 15 is a water quality meter of oxidation water inlet and outlet indexes of a chemical oxidation tank for bullfrog culture sewage in example 3 of the invention;
FIG. 16 is a water quality meter of water inlet and outlet indexes for filtering, adsorbing and removing phosphorus of bullfrog culture sewage in embodiment 3 of the invention.
The specific implementation mode is as follows:
a method for purifying and regenerating aquaculture wastewater,
the method comprises the following steps:
(1) And (3) precipitation and biochemistry: the aquaculture wastewater is discharged into a biochemical pond 100, solid particles such as excrement, residual feed and the like in the wastewater are biochemically precipitated, and COD and BOD in the wastewater are oxidized into CO under the action of microorganisms 2 Converting organic phosphorus into inorganic acid radical;
(2) Sand filtration of a water collecting well 200: collecting the biochemically precipitated aquaculture sewage in a wastewater collection well 200 with sand filtration, and pumping the aquaculture sewage into a reaction tank/tank 300 through a wastewater inlet pipe by a pump;
(3) And (3) oxidation: adding 20% sodium hydroxide solution according to 100-300 ml/L, adjusting the pH value of the wastewater to 7.5-8.8, synchronously adding 10-12% commercial sodium hypochlorite according to 50-200 ml/L, uniformly mixing, entering a reaction tank/tank 300 for oxidation reaction, and oxidizing ammonia nitrogen in the wastewater into nitrogen;
NH 4 + + NaClO —→ NH 2 Cl + H 2 O + Na + (monochloramine)
NH 2 Cl + NaClO —→ NHCl 2 + H 2 O + Na + (Dichloroamine)
2NH 2 Cl +NaClO—→ N 2 ↑+ 3HCl + H 2 O+Na + (denitrogenation main reaction one)
The general reaction formula is as follows:
2NH 4 + + 3NaClO —→N 2 ↑+ 3HCl + H 2 O+3Na +
(4) And (3) filtering: pumping the oxidized wastewater into a filter 400, further filtering to remove tiny solid small particles in the wastewater, then flowing out of a water outlet of the filter 400, and entering a filtering adsorption tower 500;
(5) Filtering, adsorbing and removing phosphorus: the wastewater flows out from top to bottom, phosphate anions in the wastewater are adsorbed by the adsorbent to remove phosphorus in the wastewater, and the clear water after phosphorus removal is measured by a flowmeter through a water outlet of the filtering adsorption tower and then discharged into a natural water body;
after the filtration, adsorption and dephosphorization are carried out, the total phosphorus in the effluent is less than or equal to 0.1mg/L, and the phosphorus removal rate is 90-99.5%;
reaction formula (adsorption reaction):
Fe-OOH+H 2 PO 4 - = Fe-O-HPO 4 - +H 2 O
(6) Regeneration of the filtering and adsorbing filler: the total phosphorus concentration of the effluent is tracked and detected in time, and when the total phosphorus concentration of the effluent is close to a set value, the wastewater lift pump is closed, and then the water inlet of the filtration and adsorption tower and the water outlet of the filtration and adsorption tower are closed; opening a backwash liquid inlet of the filtration and adsorption tower, pumping a regeneration liquid (analytic liquid) into the filtration and adsorption tower by using a regeneration liquid conveying pump to reach a liquid level, carrying out backwashing regeneration for 60-90 minutes, eluting phosphate radicals adsorbed in the adsorption filler, and pumping the eluted regeneration liquid into a phosphorus recovery reaction tank (tank) by using a regeneration desorption liquid conveying pump at a backwash liquid outlet of the filtration and adsorption tower; after the desorption is finished, washing the adsorbent with clear water to be neutral, and finishing the regeneration of the adsorption filler;
reaction formula (desorption reaction):
Fe-O-HPO 4 - +3OH - = Fe-OOH+PO 4 3- +OH - +H 2 O
(7) And (3) recovering phosphorus: adding a phosphorus precipitator into the backwashing desorption liquid pumped into the phosphorus recovery reaction tank (tank) 600, stirring for reaction, reacting phosphate radicals in the recovery liquid with calcium ions to generate calcium phosphate precipitate, injecting the backwashing desorption liquid after reaction into a phosphorus precipitation tank 620, performing precipitation separation, and drying to obtain recovered calcium phosphate;
reaction formula (precipitation crystallization reaction):
PO 4 3- +3/2Ca(OH) 2 = 1/2Ca 3 （PO 4 ） 2 +3OH -
the principle of phosphorus removal of the culture wastewater is as follows:
the reaction equations of adsorption, desorption and phosphorus resource recovery are as follows:
removing phosphorus from sewage (adsorption reaction)
Fe-OOH+H 2 PO 4 - = Fe-O-HPO 4 - +H 2 O
Regeneration of the adsorbent (desorption reaction)
Fe-O-HPO 4 - +3OH - = Fe-OOH+PO 4 3- +OH - +H 2 O
Phosphorus resource recovery (flocculation crystallization reaction)
PO 4 3- +3/2Ca(OH) 2 = 1/2Ca 3 （PO 4 ） 2 +3OH -
The adsorption filler of the filtration adsorption tower is iron-based oxyhydroxide phosphorus adsorption special filler, and the bulk density of the adsorption filler is 0.40 kg/m 3 The adsorption capacity is 1 kg/m 3；
The thickness of the adsorption filler filled in the filtration adsorption tower is 1000-2000 mm;
the phosphorus precipitator is a clear saturated calcium hydroxide solution or a 5-25% calcium chloride solution.
Example 1
The purification and regeneration method of the eel culture wastewater of 500 tons/day comprises the following steps:
referring to fig. 1 to 4, the method for purifying and regenerating aquaculture wastewater provided by the embodiment comprises the steps of directly discharging the eel aquaculture wastewater into a biochemical pond 100, naturally precipitating and oxidizing excrement and residual feed discharged by eels in the wastewater in the biochemical pond for 4 to 10 hours, and obtaining COD (chemical oxygen demand) in the wastewater Cr 、BOD 5 Is oxidized into carbon dioxide by microorganisms in the water body, simultaneously oxidizes ammonia nitrogen into nitrate, and oxidizes and decomposes a large amount of phosphorus-containing organic matters in the wastewater into inorganic phosphate;
in this embodiment, the water inlet index and the effluent standard index of the eel culture wastewater to be treated are shown in figure 5.
In the method for purifying and regenerating the aquaculture wastewater, the eel aquaculture wastewater is collected and discharged into the biochemical pond 100, precipitated and biochemically treated, and then enters the water collecting well 200 with sand filtration, and the indexes of the eel aquaculture wastewater pollutants after the biochemical treatment in the biochemical pond are shown in the attached figure 6;
after the precipitation and the biochemistry, the eel breeding wastewater enters a water collecting well 200 with a sand filter, is pumped into a reaction tank (tank) 300 by a wastewater lifting pump, is added with 10 to 12 percent of commodity sodium hypochlorite according to the adding amount of 100ml/L, is uniformly mixed by a pipeline mixer, and enters the reaction tank (tank) 300 for oxidation reaction.
The indexes of the pollutants in the chemically oxidized eel culture wastewater are shown in figure 7;
as can be seen from the attached figure 7, the reaction tank (tank) 300 of the eel culture wastewater treatment system can oxidize ammonia nitrogen in sewage from 3mg/L to less than 0.5mg/L, and the total phosphorus concentration is unchanged after the oxidation treatment.
The eel culture wastewater after oxidation treatment flows into a filter 400, and flows into a phosphorus filtering and adsorbing tower 500 after filtration, and the flow rate is 21m 3 The index of the effluent after filtration and adsorption is shown in figure 8.
The total phosphorus concentration of the effluent is tracked and detected in time, when the total phosphorus concentration of the effluent is close to a set value, the wastewater lift pump is closed firstly, and then the water inlet of the filtration adsorption tower and the water outlet of the filtration adsorption tower are closed; opening a backwash liquid inlet of the filtration and adsorption tower, pumping a regeneration liquid (analytic liquid) into the filtration and adsorption tower by using a regeneration liquid conveying pump to reach a liquid level, carrying out backwashing regeneration for 60-90 minutes, eluting phosphate radicals adsorbed in the adsorption filler, and pumping the eluted regeneration liquid into a phosphorus recovery reaction tank (tank) by using a regeneration desorption liquid conveying pump at a backwash liquid outlet of the filtration and adsorption tower; after the desorption is finished, washing the adsorbent with clear water to be neutral, and finishing the regeneration of the adsorption filler;
adding a phosphorus precipitator into the backwashing desorption liquid pumped into the phosphorus recovery reaction tank (tank) 600, stirring for reaction, reacting phosphate radicals in the recovery liquid with calcium ions to generate calcium phosphate precipitate, injecting the backwashing desorption liquid after reaction into a phosphorus precipitation tank, performing precipitation separation, and drying to obtain the recovered calcium phosphate.
As shown in the attached figure 9, after the eel culture wastewater is treated by the steps of biochemistry, chemical strong oxidation, precise filtration, filtration adsorption and the like, the ammonia nitrogen and the total phosphorus in the effluent are less than or equal to 0.5mg/L and less than or equal to 0.2mg/L, and the indexes of the ammonia nitrogen and the total phosphorus in the effluent meet the indexes of class III water corresponding to the environmental quality standard of surface water (GB 3838-2002) Table 1.
Example 2
The method for purifying and regenerating the 1000 ton/day penaeus vannamei boone culture wastewater comprises the following steps:
referring to fig. 1 to 4, the method for purifying and regenerating wastewater of penaeus vannamei boone provided in this embodiment sequentially includes two steps of oxidation and filtration adsorption, specifically:
the eel breeding wastewater is collected and discharged into the biochemical pond 100, and is precipitated and biochemical.
The effect of the biochemical precipitation on removing the pollutant indexes of the litopenaeus vannamei culture wastewater is shown in the attached figure 15.
As shown in the attached drawing 10, the chemical strong oxidation device 300 of the penaeus vannamei culture wastewater treatment system can biochemically oxidize COD in wastewater from 80mg/L to below 20mg/L, oxidize ammonia nitrogen from 10mg/L to less than 3mg/L, and biochemically oxidize total phosphorus concentration from 1.5mg/L to below 1 mg/L.
The wastewater after biochemical precipitation enters a water collecting well 200 with sand filtration, the litopenaeus vannamei aquaculture wastewater is pumped into a reaction tank (tank) 300 by a wastewater lift pump, 10-12% of commercial sodium hypochlorite is added according to the proportion of 120ml/L, the sodium hypochlorite is uniformly mixed by a pipeline mixer, and the mixed wastewater enters the reaction tank (tank) 300 for oxidation reaction.
The indexes of the oxidized penaeus vannamei boone culture wastewater pollutants are shown in the attached figure 11.
As can be seen from the attached figure 11, the chemical strong oxidation device 300 of the penaeus vannamei culture wastewater treatment system can oxidize ammonia nitrogen in wastewater from 10mg/L to less than 0.5mg/L, and the total phosphorus concentration after oxidation treatment is unchanged.
The oxidized penaeus vannamei boone culture wastewater flows into a filter 400, is filtered and flows into a phosphorus filtering and adsorbing tower 500, and the flow rate is 42m 3 The index of the effluent after filtration and adsorption is shown in figure 12.
As shown in the attached figure 12, after the litopenaeus vannamei aquaculture wastewater is treated by five steps of biochemical precipitation, sand filtration of a water collecting well, oxidation, filtration and filtration adsorption, the ammonia nitrogen and the total phosphorus in the effluent are less than or equal to 0.5mg/L and less than or equal to 0.2mg/L, and the indexes of the ammonia nitrogen and the total phosphorus in the effluent meet the indexes of class III water corresponding to the environmental quality standard of surface water (GB 3838-2002) Table 1. The regeneration of the filtration and adsorption column and the recovery of phosphorus were carried out as in example 1 and will not be described.
Example 3
Method for breeding bullfrog with 500 ton/day of wastewater
Referring to fig. 1 to 4, in the method for purifying and regenerating bullfrog wastewater provided in this embodiment, the water inlet index and the water outlet standard index of the bullfrog breeding wastewater to be treated are shown in fig. 13.
The bullfrog breeding wastewater is collected and discharged into a biochemical pond 100, enters a water collecting well 200 with sand filtration after being precipitated and biochemically, and enters the water collecting well 200 with sand filtration after being precipitated and biochemically.
The indexes of the bullfrog breeding wastewater pollutants after biochemical treatment in biochemical pond are shown in figure 14.
As can be seen from FIG. 14, the biochemical pond 100 of the bullfrog cultivation wastewater treatment system can oxidize COD in wastewater from 80mg/L to less than 30mg/L, ammonia nitrogen from 10mg/L to less than 3mg/L, and total phosphorus concentration after biochemical treatment of precipitation is oxidized from 3mg/L to less than 1.5mg/L.
After biochemical treatment, the bullfrog breeding wastewater is pumped into a reaction tank (tank) 300 by using a wastewater lifting pump, 10 to 12 percent of commodity sodium hypochlorite is added according to the proportion of 100ml/L, and the mixture is uniformly mixed by a pipeline mixer and enters a reaction tank (tank) 110 for oxidation reaction.
The indexes of the pollutants in the bullfrog breeding wastewater after chemical oxidation are shown in figure 15.
As can be seen from FIG. 15, the oxidation of the chemical oxidation device 300 of the bullfrog culture wastewater treatment system can oxidize COD in wastewater from 30mg/L to less than 20mg/L, oxidize ammonia nitrogen from 3mg/L to less than 0.5mg/L, and maintain the total phosphorus concentration unchanged after the chemical oxidation treatment.
The bullfrog culture wastewater after the chemical oxidation treatment flows into a filter 400, and flows into a phosphorus filtering and adsorbing tower 500 after being filtered, and the flow rate is 21m 3 The index of the effluent after filtration and adsorption is shown in figure 16.
As shown in the attached figure 16, after the bullfrog breeding wastewater is treated by five steps of precipitation biochemistry, chemical strong oxidation, precise filtration and filtration adsorption, the COD of the effluent water Cr The content of ammonia nitrogen is less than or equal to 20mg/L, the content of ammonia nitrogen is less than or equal to 0.5mg/L, the content of total phosphorus is less than or equal to 0.2mg/L, and the indexes of ammonia nitrogen and total phosphorus in effluent meet the indexes of class III water corresponding to the environmental quality standard of surface water (GB 3838-2002) table 1.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (4)

1. A method for purifying and regenerating aquaculture wastewater is characterized by comprising the following steps:
the method comprises the following steps:
(1) And (3) precipitation and biochemistry: discharging the aquaculture wastewater into a biochemical pond, and biochemically precipitating feces and residual feed in the wastewaterSolid particles such as materials, and the like, and simultaneously oxidize COD and BOD in the wastewater into CO through the action of microorganisms 2 Converting the organic phosphorus into inorganic acid radical;
(2) Sand filtration of a water collecting well 200: collecting the biochemically precipitated breeding sewage in a collecting well with wastewater and sand filtration, and pumping the breeding sewage into a reaction tank/tank by a pump through a wastewater inlet pipe;
(3) And (3) oxidation: adding 20% sodium hydroxide solution according to 100-300 ml/L, adjusting the pH value of the wastewater to 7.5-8.8, synchronously adding 10-12% commercial sodium hypochlorite according to 50-200 ml/L, uniformly mixing, entering a reaction tank for oxidation reaction, and oxidizing ammonia nitrogen in the wastewater into nitrogen;
(4) And (3) filtering: pumping the oxidized wastewater into a filter, further filtering to remove tiny solid small particles in the wastewater, then flowing out of a water outlet of the filter, and entering a filtering adsorption tower;
(5) Filtering, adsorbing and removing phosphorus: the wastewater flows out from top to bottom, phosphate anions in the wastewater are adsorbed by the adsorbent to remove phosphorus in the wastewater, and the clear water after phosphorus removal is measured by a flowmeter through a water outlet of the filtering adsorption tower and then discharged into a natural water body;
after the phosphorus is removed by filtration and adsorption, the total phosphorus in the effluent is less than or equal to 0.1mg/L, and the phosphorus removal rate is 90-99.5%;
(6) Regeneration of the filtering and adsorbing filler: the total phosphorus concentration of the effluent is tracked and detected in time, and when the total phosphorus concentration of the effluent is close to a set value, the wastewater lift pump is closed, and then the water inlet of the filtration adsorption tower and the water outlet of the filtration adsorption tower are closed; opening a backwash liquid inlet of the filtration and adsorption tower, pumping a regeneration liquid (analytic liquid) into the filtration and adsorption tower by using a regeneration liquid conveying pump to reach a liquid level, carrying out backwashing regeneration for 60-90 minutes, eluting phosphate radicals adsorbed in the adsorption filler, and pumping the eluted regeneration liquid into a phosphorus recovery reaction tank (tank) by using a regeneration desorption liquid conveying pump at a backwash liquid outlet of the filtration and adsorption tower; after the desorption is finished, washing the adsorbent with clear water to be neutral, and finishing the regeneration of the adsorption filler;
(7) And (3) recovering phosphorus: adding a phosphorus precipitator into the backwashing desorption liquid pumped into the phosphorus recovery reaction tank (pot), stirring for reaction, reacting phosphate radicals in the recovery liquid with calcium ions to generate calcium phosphate precipitate, injecting the backwashing desorption liquid after reaction into a phosphorus precipitation tank 620, separating the precipitate, and drying to obtain the recovered calcium phosphate.
2. The method for purifying and regenerating aquaculture wastewater as claimed in claim 1, wherein the method comprises the following steps: the adsorption filler of the filtration adsorption tower is iron-based oxyhydroxide phosphorus adsorption special filler, and the bulk density of the adsorption filler is 0.40 kg/m 3 The adsorption capacity is 1 kg/m 3 。
3. The method for purifying and regenerating aquaculture wastewater as claimed in claim 1, wherein the method comprises the following steps: the thickness of the adsorption filler filled in the filtration adsorption tower is 1000-2000 mm.
4. The method for purifying and regenerating aquaculture wastewater as claimed in claim 1, wherein the method comprises the following steps: the phosphorus precipitator is a clear saturated calcium hydroxide solution or a 5-25% calcium chloride solution.
CN202211316112.9A 2022-10-26 2022-10-26 Method for purifying and regenerating aquaculture wastewater Pending CN115626733A (en)

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