CN111573954A - Pretreatment process of livestock and poultry breeding wastewater - Google Patents
Pretreatment process of livestock and poultry breeding wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 63
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- 239000006247 magnetic powder Substances 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 36
- 238000005345 coagulation Methods 0.000 claims abstract description 34
- 230000015271 coagulation Effects 0.000 claims abstract description 34
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000010802 sludge Substances 0.000 claims abstract description 27
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 18
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- 238000004064 recycling Methods 0.000 claims abstract description 4
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- 238000003756 stirring Methods 0.000 claims description 27
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- 238000004062 sedimentation Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 10
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- 238000009264 composting Methods 0.000 claims description 8
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- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 6
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
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- 238000005054 agglomeration Methods 0.000 claims description 4
- 230000002776 aggregation Effects 0.000 claims description 4
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- 239000000084 colloidal system Substances 0.000 claims description 4
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- 239000006148 magnetic separator Substances 0.000 claims description 4
- 239000012982 microporous membrane Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 4
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 2
- 239000004254 Ammonium phosphate Substances 0.000 claims description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000012670 alkaline solution Substances 0.000 claims description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 2
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- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 2
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- 239000003814 drug Substances 0.000 abstract description 6
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
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- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 2
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- 229940037003 alum Drugs 0.000 description 1
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Classifications
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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
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/28—Ammonium phosphates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/164—Ammonium chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/18—Nitrates of ammonium
- C01C1/185—Preparation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
- C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- 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
- 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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- C02F2101/30—Organic compounds
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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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- C02F2209/14—NH3-N
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Abstract
The invention discloses a pretreatment process of livestock and poultry breeding wastewater, which comprises the following steps: 1) solid-liquid separation: carrying out solid-liquid separation on the livestock and poultry breeding wastewater to remove large-particle suspended matters; 2) magnetic coagulation and precipitation: treating the wastewater after solid-liquid separation to obtain sludge containing magnetic powder and a liquid after magnetic coagulation; 3) and (3) pH adjustment: adjusting the pH of the liquid after magnetic coagulation to 10.5-12; 4) gaseous membrane deamination: ammonia nitrogen in the liquid after magnetic coagulation is absorbed by the ammonia absorption liquid through a gaseous film in a gaseous form; 5) magnetic powder separation and reuse: and (4) carrying out magnetic separation on the sludge containing the magnetic powder to obtain the magnetic powder and the sludge. The invention can synchronously realize the removal of pollutants such as COD, suspended matters, ammonia nitrogen, TP and the like in the wastewater, and is convenient for subsequent biochemical treatment; the pretreatment method has the advantages of low added medicament cost, low toxicity and basically no secondary pollution, generates high-concentration ammonium salt solution, realizes the recycling treatment of the livestock and poultry breeding wastewater, and can reuse magnetic powder after magnetic separation to reduce the sludge amount.
Description
Technical Field
The invention relates to a pretreatment process of livestock and poultry breeding wastewater, belonging to the technical field of pretreatment of wastewater.
Background
In recent years, with the improvement of the living standard of residents, the consumption demand of livestock products is continuously increased, thereby promoting the continuous development of animal husbandry. According to statistics, the total animal husbandry value in 2017 in China exceeds 3.2 trillion, and the total animal husbandry value accounts for nearly 30% of the total agricultural value. However, with the expansion of production scale, the pollution problem of livestock and poultry breeding industry is increasingly prominent, livestock and poultry breeding wastewater becomes the first source of agricultural non-point source pollution in China and is also an important source of environmental pollution in China, if the livestock and poultry breeding wastewater is not properly treated, serious environmental pollution is caused, water bodies become black and smelly or eutrophication, even the safety of underground water environment is threatened, and certain harm is caused to the atmosphere and soil. Therefore, the effective treatment of the livestock and poultry breeding wastewater is urgent.
The livestock and poultry breeding wastewater has the characteristics of high COD, high suspended matters, high ammonia nitrogen and the like, is not beneficial to the growth and the propagation of microorganisms, is difficult to adopt biological treatment if not subjected to pretreatment, and can only adopt a physicochemical method for treatment, so that the treatment cost is higher. Therefore, the pretreatment of the livestock and poultry breeding wastewater has important significance for reducing the treatment cost and improving the effluent quality.
Most of livestock and poultry breeding wastewater is pretreated by coagulating sedimentation, but if the livestock and poultry breeding wastewater is pretreated by coagulating sedimentation only, the coagulation effect is poor because the livestock and poultry wastewater contains a large amount of organic matters and suspended matters, and the coagulation needs to be enhanced. In addition, ammonia nitrogen cannot be effectively removed only by adopting coagulation sedimentation, ammonia nitrogen is subsequently removed by combining other technologies, if technologies such as stripping and the like are adopted, the treatment cost is high, and the national policy requirement for resourceful treatment of livestock and poultry breeding feces is not met; if the biological method is directly adopted to treat ammonia nitrogen, the treatment effect is poor because the ammonia nitrogen concentration is high and is not beneficial to the growth of related strains. For phosphorus removal, if only a biological method is adopted for phosphorus removal, the effect is poor; chemical precipitation is adopted for dephosphorization, the dosage of the medicament is large, and the generated sludge needs subsequent treatment and has higher cost; the crystallization method (struvite method) is adopted for dephosphorization, so that the yield of struvite is low and the cost is high.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a pretreatment method of livestock and poultry breeding wastewater, which can synchronously remove pollutants such as COD, suspended matters, ammonia nitrogen, TP and the like in the wastewater, greatly reduce the suspended matters, ammonia nitrogen and TP in the wastewater and greatly reduce the production load of subsequent biochemical treatment; the pretreatment method has the advantages of low added medicament cost, low toxicity and no secondary pollution basically, generates high-concentration ammonium salt solution, realizes the recycling treatment of the livestock and poultry breeding wastewater, simultaneously adopts magnetic coagulation to play a role in removing suspended matters, is beneficial to dephosphorization, can reduce the dosage of the medicament, and can also recycle magnetic powder after magnetic separation, reduce the sludge amount and be beneficial to reducing the cost.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a pretreatment process of livestock and poultry breeding wastewater comprises the following steps:
(1) solid-liquid separation: carrying out solid-liquid separation on the livestock and poultry breeding wastewater to remove large-particle suspended matters, using solid obtained after the solid-liquid separation for producing organic fertilizer through composting, and carrying out the next process on the wastewater obtained after the solid-liquid separation;
(2) magnetic coagulation and precipitation: a) firstly, adding magnetic powder and a coagulant into the wastewater after solid-liquid separation, and forming micro flocs by utilizing the magnetic powder and the coagulant to adsorb colloid and small-particle suspended matters through rapid stirring reaction; b) adding coagulant aid, reducing stirring speed, and continuously stirring to uniformly mix the coagulant aid; c) continuously reducing the stirring speed and stirring to ensure that the coagulant aid is fully contacted with the flocs to accelerate the agglomeration of the flocs; d) obtaining sludge containing magnetic powder and magnetic coagulated liquid after precipitation treatment;
(3) and (3) pH adjustment: adjusting the pH value of the liquid after magnetic coagulation to 10.5-12 to make ammonia nitrogen in the liquid after magnetic coagulation be volatile NH3The form exists;
(4) gaseous membrane deamination: the magnetic coagulated liquid and the ammonia absorption liquid reversely flow on two sides of the gaseous film, and ammonia nitrogen in the magnetic coagulated liquid is absorbed by the ammonia absorption liquid through the gaseous film in a gaseous form to obtain an ammonium salt solution;
(5) magnetic powder separation and reuse: and (3) carrying out magnetic separation on the sludge containing magnetic powder generated by the magnetic coagulation sedimentation to obtain magnetic powder and sludge, returning the magnetic powder to the step (2) for recycling, and carrying out coordinated composting on the sludge and the solid obtained after the solid-liquid separation in the step (1) to produce the organic fertilizer.
Further, in the step (1), the ammonia nitrogen concentration of the livestock and poultry breeding wastewater is 1000-5000 mg/L, and the TP concentration is 40-80 mg/L.
Further, in the step (1), solid-liquid separation is performed by using a mechanical grid, a screw stack machine or a solid-liquid separator, preferably a solid-liquid separator.
Further, in the step (2), the magnetic powder added for magnetic coagulation precipitation is black ferroferric oxide particles, the added coagulant is selected from one or more of ferric salt, aluminum salt, polyferric oxide and polyaluminium, and the coagulant aid is polyacrylamide, preferably anionic polyacrylamide.
Further, in the step (2), the adding amount of the magnetic powder in the magnetic coagulation sedimentation is 1-10 g/L, the adding amount of the coagulant is 100-1000 mg/L, and the adding amount of the coagulant aid is 2-20 mg/L.
Further, in the step (2), in the magnetic coagulation sedimentation process:
a) the rotation speed of the medium stirring is 180-300r/min, the time is 1-5min, preferably the rotation speed is 210r/min, and the stirring time is 4 min;
b) the rotation speed of the medium stirring is 90-150r/min, the time is 2-10min, preferably the rotation speed is 120r/min, and the stirring time is 6 min;
c) the rotation speed of the medium stirring is 60-120r/min, the time is 10-40min, preferably the rotation speed is 90r/min, and the stirring time is 20 min;
d) the time for the middle precipitation treatment is 20-40min, preferably 30 min.
The inventor finds that the magnetic coagulation sedimentation process is mainly divided into three stages, namely a mixing stage, a flocculation reaction stage and a sedimentation stage. The mixing stage is a mixing and dispersing stage formed after the magnetic powder and the coagulant are added, and the magnetic powder and the coagulant must be quickly and uniformly diffused into the wastewater to create good hydrolysis and polymerization conditions and increase the collision chance of the coagulant, the magnetic powder and pollutants in the wastewater, so that the mixing stage is quickly and violently stirred and is completed in a short time. The flocculation reaction stage is a floc generation and growth stage, and firstly, the coagulant aid is required to be rapidly dispersed and is rapidly mixed with the coagulant, the magnetic powder and pollutants in the wastewater; secondly, after the coagulant aid is rapidly dispersed, large flocs with good settling property are formed by flocculation through the actions of adsorption bridging, adsorption electric neutralization, double electric layers compression and the like between the coagulant aid and the coagulant aid, but if the stirring is too violent, the action between the coagulant aid and the coagulant aid is destroyed, the flocs are not easy to grow, so that the stirring cannot be too violent, and the large flocs are prevented from being broken and being not beneficial to the formation of alum flocs. Therefore, the stirring speed is further reduced to prevent the flocs from growing up and to break the formed alumen ustum. The final precipitation stage is mainly that the agglomerated large flocs are precipitated under the action of gravity and separated from the wastewater, so the process needs to be kept still and is not suitable for stirring.
Further, in the step (3), the pH of the liquid after magnetic coagulation is adjusted by adding alkaline solution sodium hydroxide or potassium hydroxide.
Further, in the step (4), the ammonia absorption liquid is a sulfuric acid, hydrochloric acid, nitric acid or phosphoric acid solution.
Further, in the step (4), the gaseous membrane is a hollow fiber hydrophobic microporous membrane.
Further, in the step (4), the ammonium salt solution is ammonium sulfate, ammonium chloride, ammonium nitrate or ammonium phosphate solution, and the ammonium salt solution is used for producing solid ammonium salt.
Further, in the step (5), the magnetic separation is to send the sludge containing magnetic powder into a high-shear machine through a delivery pump to carry out high-speed stirring and shearing, so as to realize the separation of the magnetic powder and the sludge, and then the magnetic powder is recovered through a magnetic separator.
The beneficial results of the invention are as follows:
the pretreatment process provided by the invention realizes synchronous removal of pollutants such as COD, suspended matters, ammonia nitrogen and TP in the wastewater, greatly reduces the suspended matters, ammonia nitrogen and TP in the wastewater, and greatly reduces the production load of subsequent biochemical treatment. The invention adopts the added magnetic powder to carry out reinforced coagulation, the added magnetic powder is quickly combined with a coagulant, pollutants and the like into a whole to form a magnetic complex, then the characteristics of large specific gravity of the magnetic powder are utilized to achieve the effects of quickly settling and shortening the settling time, and meanwhile, the magnetic powder not only can play a role of removing suspended matters in a reinforced way, but also can remove phosphorus in a reinforced way and reduce the adding amount of a medicament; in addition, the magnetic powder can be recycled after magnetic separation, so that the sludge amount is reduced, and the cost is reduced; the gaseous membrane deamination process is simple, and high-concentration ammonium salt solution is generated while ammonia nitrogen in the wastewater is removed, so that resource utilization of the ammonia nitrogen is realized. The invention not only has low cost and low toxicity of the added medicament and basically does not cause secondary pollution, but also generates high-concentration ammonium salt solution which can be used for preparing solid ammonium salt for use or sale, thereby generating benefit and reducing the treatment cost.
Drawings
FIG. 1 is a schematic flow chart of the pretreatment process of livestock and poultry breeding wastewater.
Detailed Description
In order to make the technical means, creation features, working procedures and using methods of the present invention easily understood and appreciated, the contents of the present invention will be further described with reference to the following embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A pretreatment process of livestock and poultry breeding wastewater comprises the following steps:
(1) solid-liquid separation: taking 1000mL of livestock and poultry breeding wastewater with the COD concentration of 7000mg/L, the ammonia nitrogen concentration of 1000mg/L, the TP concentration of 50mg/L and the SS concentration of 1000mg/L, carrying out solid-liquid separation by a solid-liquid separator to remove large-particle suspended matters, using solid obtained after the solid-liquid separation for composting to produce organic fertilizer, and carrying out the next process on the wastewater obtained after the solid-liquid separation;
(2) magnetic coagulation and precipitation: a) firstly, 8g/L ferroferric oxide and 500mg/L PAC are added into the wastewater after solid-liquid separation, and are stirred for 4min at 210r/min to react and form micro floc by utilizing the ferroferric oxide, PAC adsorption colloid and small particle suspended matters; b) adding 10mg/L PAM, and stirring at 120r/min for 6min to uniformly mix PAM; c) then stirring for 20min at 90r/min to ensure that PAM is fully contacted with the micro flocs to accelerate the agglomeration of the micro flocs; d) standing and precipitating for 30min to obtain sludge containing ferroferric oxide and magnetic coagulated liquid;
(3) and (3) pH adjustment: adjusting the pH value of the magnetically coagulated liquid to 11 by using a sodium hydroxide solution to enable ammonia nitrogen in the magnetically coagulated liquid to be volatile NH3The form exists;
(4) gaseous membrane deamination: the method comprises the following steps of (1) enabling magnetic coagulation liquid and ammonia absorption liquid sulfuric acid after pH adjustment to reversely flow on two sides of a mesoporous fiber hydrophobic microporous membrane, enabling ammonia nitrogen in the magnetic coagulation liquid to be absorbed by the sulfuric acid through a gaseous membrane in a gaseous form to obtain a high-concentration ammonium sulfate solution, wherein the ammonium sulfate solution is used for producing solid ammonium salt, and enabling treated wastewater to enter biochemical treatment after pH adjustment;
(5) magnetic powder separation and reuse: and (3) the sludge generated by the magnetic coagulation sedimentation enters a high shear machine through a pipeline to be stirred and sheared at a high speed, so that the ferroferric oxide is separated from the sludge, then the ferroferric oxide is recovered through a magnetic separator, the ferroferric oxide returns to the step (2) to be recycled, and the sludge and the solid obtained after the solid-liquid separation in the step (1) are subjected to coordinated composting to produce the organic fertilizer.
And (3) detecting the wastewater treated in the step (4), wherein the COD concentration of the effluent is 1036mg/L, the ammonia nitrogen concentration is 44mg/L, the TP concentration is 3.8mg/L, and the SS concentration is 79mg/L, namely the COD removal rate of the effluent is 85.2%, the ammonia nitrogen removal rate is 95.6%, the TP removal rate is 92.4%, and the SS removal rate is 92.1% after the livestock and poultry breeding wastewater is pretreated by the process.
Comparative example 1
A pretreatment process of livestock and poultry breeding wastewater comprises the following steps:
(1) solid-liquid separation: taking 1000mL of livestock and poultry breeding wastewater with the COD concentration of 7000mg/L, the ammonia nitrogen concentration of 1000mg/L, the TP concentration of 50mg/L and the SS concentration of 1000mg/L, carrying out solid-liquid separation by a solid-liquid separator to remove large-particle suspended matters, using solid obtained after the solid-liquid separation for composting to produce organic fertilizer, and carrying out the next process on the wastewater obtained after the solid-liquid separation;
(2) magnetic coagulation and precipitation: a) firstly, 8g/L ferroferric oxide and 500mg/L PAC are added into the wastewater after solid-liquid separation, and are stirred for 4min at 210r/min to react and form micro floc by utilizing the ferroferric oxide, PAC adsorption colloid and small particle suspended matters; b) adding 10mg/L PAM, and stirring at 210r/min for 6min to uniformly mix the PAM; c) continuing stirring at 210r/min for 20min to make PAM fully contact with the micro flocs to accelerate the agglomeration of the micro flocs; d) standing and precipitating for 30min to obtain sludge containing ferroferric oxide and magnetic coagulated liquid;
(3) and (3) pH adjustment: adjusting the pH value of the magnetically coagulated liquid to 11 by using a sodium hydroxide solution to enable ammonia nitrogen in the magnetically coagulated liquid to be volatile NH3The form exists;
(4) gaseous membrane deamination: the method comprises the following steps of (1) enabling magnetic coagulation liquid and ammonia absorption liquid sulfuric acid after pH adjustment to reversely flow on two sides of a mesoporous fiber hydrophobic microporous membrane, enabling ammonia nitrogen in the magnetic coagulation liquid to be absorbed by the sulfuric acid through a gaseous membrane in a gaseous form to obtain a high-concentration ammonium sulfate solution, wherein the ammonium sulfate solution is used for producing solid ammonium salt, and enabling treated wastewater to enter biochemical treatment after pH adjustment;
(5) magnetic powder separation and reuse: and (3) the sludge generated by the magnetic coagulation sedimentation enters a high shear machine through a pipeline to be stirred and sheared at a high speed, so that the ferroferric oxide is separated from the sludge, then the ferroferric oxide is recovered through a magnetic separator, the ferroferric oxide returns to the step (2) to be recycled, and the sludge and the solid obtained after the solid-liquid separation in the step (1) are subjected to coordinated composting to produce the organic fertilizer.
And (3) detecting the wastewater treated in the step (4), wherein the COD concentration of the effluent is 2069mg/L, the ammonia nitrogen concentration is 72mg/L, the TP concentration is 9.9mg/L, and the SS concentration is 180mg/L, namely the COD removal rate of the effluent is 70.4%, the ammonia nitrogen removal rate is 92.8%, the TP removal rate is 80.2%, and the SS removal rate is 82% after the livestock and poultry breeding wastewater is pretreated by the process.
TABLE 1 Water quality of Inlet and outlet water in example 1 and comparative example 1
Claims (11)
1. A pretreatment process of livestock and poultry breeding wastewater is characterized by comprising the following steps:
(1) solid-liquid separation: carrying out solid-liquid separation on the livestock and poultry breeding wastewater to remove large-particle suspended matters, using solid obtained after the solid-liquid separation for producing organic fertilizer through composting, and carrying out the next process on the wastewater obtained after the solid-liquid separation;
(2) magnetic coagulation and precipitation: a) firstly, adding magnetic powder and a coagulant into the wastewater after solid-liquid separation, and forming micro flocs by utilizing the magnetic powder and the coagulant to adsorb colloid and small-particle suspended matters through rapid stirring reaction; b) adding coagulant aid, reducing stirring speed, and continuously stirring to uniformly mix the coagulant aid; c) continuously reducing the stirring speed and stirring to ensure that the coagulant aid is fully contacted with the flocs to accelerate the agglomeration of the flocs; d) obtaining sludge containing magnetic powder and magnetic coagulated liquid after precipitation treatment;
(3) and (3) pH adjustment: adjusting the pH value of the liquid after magnetic coagulation to 10.5-12 to make ammonia nitrogen in the liquid after magnetic coagulation be volatile NH3The form exists;
(4) gaseous membrane deamination: the magnetic coagulated liquid and the ammonia absorption liquid reversely flow on two sides of the gaseous film, and ammonia nitrogen in the magnetic coagulated liquid is absorbed by the ammonia absorption liquid through the gaseous film in a gaseous form to obtain an ammonium salt solution;
(5) magnetic powder separation and reuse: and (3) carrying out magnetic separation on the sludge containing magnetic powder generated by the magnetic coagulation sedimentation to obtain magnetic powder and sludge, returning the magnetic powder to the step (2) for recycling, and carrying out coordinated composting on the sludge and the solid obtained after the solid-liquid separation in the step (1) to produce the organic fertilizer.
2. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (1), the ammonia nitrogen concentration of the livestock and poultry breeding wastewater is 1000-5000 mg/L, and the TP concentration is 40-80 mg/L.
3. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (1), solid-liquid separation is carried out by adopting a mechanical grating, a screw stacking machine or a solid-liquid separator.
4. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (2), the magnetic powder added for magnetic coagulation precipitation is black ferroferric oxide particles, the added coagulant is selected from one or more of ferric salt, aluminum salt, polyferric oxide and polyaluminium, and the coagulant aid is polyacrylamide.
5. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (2), the adding amount of the magnetic powder in the magnetic coagulation sedimentation is 1-10 g/L, the adding amount of the coagulant is 100-1000 mg/L, and the adding amount of the coagulant aid is 2-20 mg/L.
6. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (2), in the magnetic coagulation sedimentation process:
a) the rotation speed of the medium stirring is 180-300r/min, and the time is 1-5 min;
b) the rotation speed of the medium stirring is 90-150r/min, and the time is 2-10 min;
c) the rotation speed of the medium stirring is 60-120r/min, and the time is 10-40 min;
d) the treatment time of the medium precipitation is 20-40 min.
7. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (3), the pH of the liquid after magnetic coagulation is adjusted by adding alkaline solution sodium hydroxide or potassium hydroxide.
8. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (4), the ammonia absorption liquid is sulfuric acid, hydrochloric acid, nitric acid or phosphoric acid solution.
9. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (4), the gaseous membrane is a hollow fiber hydrophobic microporous membrane.
10. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (4), the ammonium salt solution is ammonium sulfate, ammonium chloride, ammonium nitrate or ammonium phosphate solution, and the ammonium salt solution is used for producing solid ammonium salt.
11. The livestock and poultry breeding wastewater pretreatment process according to claim 1, characterized in that: in the step (5), the magnetic separation is to send the sludge containing magnetic powder into a high-shear machine through a delivery pump to carry out high-speed stirring and shearing, so as to realize the separation of the magnetic powder and the sludge, and then to recycle the magnetic powder through a magnetic separator.
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| CN112390453A (en) * | 2020-11-25 | 2021-02-23 | 上海交通大学 | Modified magnetic Fe3O4Powder, method for the production thereof and use thereof |
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