CN114368872A - Method for reducing treatment load of cow breeding wastewater - Google Patents
Method for reducing treatment load of cow breeding wastewater Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F—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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention discloses a method for reducing the treatment load of cow breeding wastewater, which comprises the following steps: pretreating wastewater of a dairy farm; carrying out anaerobic fermentation treatment on the pretreated wastewater; carrying out foam separation on the wastewater after anaerobic fermentation to obtain foam and a water body; carrying out two-stage nitrification/denitrification reaction on the separated water body; carrying out oxidation reaction on the water body after biochemical treatment; discharging the water body after the oxidation reaction into an oxidation pond. The invention provides an anaerobic reaction-solid-liquid separation-foam separation-two-stage AO-chemical dephosphorization-oxidation pond combined process which can lead the effluent to be discharged stably and reach the standard, can effectively reduce the foam generation of a biological tank under the conditions of low energy consumption and no use of a chemical defoaming agent, and obviously reduce the operation load of the biological tank, thereby improving the existing livestock and poultry wastewater treatment effect. The treatment method has the advantages of strong impact load resistance, good treatment effect, stable operation and good application prospect.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a method for reducing the treatment load of cow breeding wastewater.
Background
The large-scale livestock and poultry farms can generate a large amount of accumulated waste water every day, and the livestock and poultry breeding pollution becomes one of the main causes of the pollution in China. The cow breeding wastewater is typical livestock breeding wastewater, the wastewater mainly comprises urine, residual excrement, colony house washing water, feed residues and the like, and belongs to high-concentration organic wastewater which is difficult to degrade, the wastewater often contains high-concentration organic matters and difficult-to-degrade substances such as soluble protein, polysaccharide, humic acid, cellulose and the like, and the cow breeding scale, breeding mode, pollution treatment mode and management mode are different, so that the water quality and water quantity change is large. These characteristics result in the characteristics of high pollution and high difficulty in treatment of the livestock and poultry breeding wastewater.
The current wastewater treatment modes mainly comprise three treatment modes of returning to fields, natural treatment and artificial strengthening treatment, wherein the artificial strengthening treatment mode is the most efficient treatment technology at present. The process for treating livestock and poultry breeding wastewater at home and abroad at present is almost the same, and the process roughly comprises the following steps: solid-liquid separation, anaerobic treatment, aerobic treatment and stable pond treatment, wherein the solid-liquid separation technology generally comprises the following steps: centrifuging, filtering, air floating, flocculating, precipitating and other processes; the common anaerobic processes are mainly: an up-flow anaerobic sludge bed (UASB), an Anaerobic Baffled Reactor (ABR), an up-flow sludge bed reactor (USR), an anaerobic biofilter, a two-stage anaerobic digestion method and the like; the aerobic treatment process mainly comprises the following steps: oxidation ditch, Sequencing Batch Reactor (SBR), rotating biological disk, biological contact oxidation, anaerobic/Aerobic (AO), and two-stage AO, etc. However, in the actual treatment process, effluent of the anaerobic process often contains a large amount of surfactants and surface active substances such as starch, protein, grease and the like, and the molecular structure of the effluent is shown to contain polar-nonpolar groups, namely, amphiphilic molecules. Under the condition of aeration, one end of a non-polar group extends into the air bubble, and the polar group is selectively adsorbed by the hydrophilic substance, so that the surface of the hydrophilic substance is converted into a hydrophobic substance to be adhered to an air bubble water film, a water body can generate a plurality of foams after entering an aerobic treatment process, the common amount of the foams is large and stable, and the foams overflow from the pool body can cause serious pollution to the external pool wall of external equipment, so that the operation condition is worsened, and the normal maintenance is influenced. The biological foam can be frozen in winter, and is difficult to clean; in summer, the wind will drift, forming bad smell and seriously affecting the surrounding environment.
The defoaming means used in the current production generally include physical methods and chemical methods. The physical defoaming method comprises a water jetting method, an air jetting method, a mechanical stirring method, a centrifugal method and the like, and the chemical method generally refers to adding a chemical defoaming agent. However, the operation effect of the defoaming methods is not ideal, and is mainly reflected in the following aspects:
the defoaming effect of the water jetting method is unstable because the effectiveness of the water jetting method has a direct relation with water quality, if the water body of the aerobic pool is used as the jet water, a certain effect is achieved in the initial stage, but along with the accumulation of surface active substances in the water body, the water jetting method can not eliminate the foam, but can severely disturb the water body and stimulate the generation of a large amount of foam; if the water body of the anaerobic tank is used as jet water, the carbon oxidation and denitrification processes of the sewage treatment process can be changed, and the subsequent carbon source shortage or the sewage denitrification effect is poor; if external water is used, the treatment capacity of the sewage treatment system can be obviously increased, the sewage treatment effect is influenced, the water consumption is large, and the water consumption cost and the treatment cost are increased.
The air-jet method and the mechanical stirring defoaming method rely on the shearing force generated by the impact and rotation of foam to realize the defoaming purpose, the defoaming capability of the methods is limited, the methods are often effective on the foam caused by low-concentration surface active substances, and the defoaming effect is greatly reduced after the surface active substances are accumulated.
The centrifugal method is to make liquid form vortex through high-speed centrifugation, the density of foam is small, and the foam is concentrated at the center of the vortex and then separated from the liquid, but the defoaming method has high energy consumption and generally needs to be used together with an auxiliary chemical defoaming method. In addition, a phenomenon of large accumulation of surface active substances also exists in the operation process, and foam is often not effectively controlled, so that the foam accumulation influences the stability of the system, and even overflows from the reactor.
The chemical defoaming method generally means that chemical defoaming agents such as organic silicon and the like are added into a biological pool to change the tension of the liquid surface and promote the foam to be unstable so as to defoam. Although the defoaming effect of the chemical defoaming method is more obvious than that of the general physical method, the chemical method often influences the property of liquid and increases new pollution, even organic silicon and other substances interfere the activated sludge to form flocs, and the contact of the activated sludge and a water body is influenced, so that the subsequent biological treatment process is influenced.
Through detection and analysis, the main components of the livestock and poultry wastewater foam are soluble protein, polypeptide, polysaccharide, amino acid and other substances which are in cross-linking combination with the soluble protein and the polypeptide. The substances are organic matters which are easy to biodegrade, the substances are separated from the water body, and the quality separation treatment is the key for solving the problem of foaming of the biological pond.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for reducing the treatment load of the dairy cow breeding wastewater.
The invention adopts the following technical scheme.
A method for reducing the treatment load of cow breeding wastewater comprises the following steps:
s1, pretreating wastewater of a dairy farm;
s2, carrying out anaerobic fermentation treatment on the pretreated wastewater;
s3, performing foam separation on the wastewater after anaerobic fermentation to obtain foam and a water body;
s4, carrying out two-stage nitrification/denitrification reaction on the separated water body;
s5, carrying out oxidation reaction on the water body after biochemical treatment;
and S6, discharging the water body after the oxidation reaction into an oxidation pond.
Further, in step S1, the preprocessing method includes: and removing suspended solids and feces in the wastewater by adopting a 5-20 mm grid or a solid-liquid separator, and then performing precipitation treatment to remove suspended matters with specific gravity larger than that of water.
Further, in step S2, the anaerobic reactor is hydraulically stayed for 15-35 days, and the temperature is maintained at 20-40 ℃.
Further, in step S2, after the anaerobic reaction, the product is sent to a 50-200 mesh centrifugal solid-liquid separator to obtain separated solid and liquid, and the liquid is subjected to a foam separation operation.
Further, the solid obtained after pretreatment and the solid obtained after anaerobic reaction centrifugation are used for manufacturing livestock bedding or aerobic composting.
Further, in the step S3, the foam separation is multi-stage bubbling separation, the gas-water ratio of the separation is 20-55, the temperature is 5-40 ℃, the separation time is 1-5 hours, the pH of the reaction system is controlled at 5-8, and the concentrated solution accounts for 15% -25%.
Further, in step S3, the separated foam is subjected to anaerobic fermentation reaction in step S2 or enters the oxidation pond in step S6 or is used for preparing liquid fertilizer.
Further, the water body is subjected to two-stage nitrification/denitrification reaction and then subjected to precipitation treatment to obtain the water body and sludge, and the sludge is subjected to biogas manure treatment.
Further, in step S5, the oxidizing agent used in the oxidation reaction is selected from ozone or photocatalytic hydroxyl radical.
Further, in the step S6, the retention time of the water in the oxidation pond is 30-60 days.
The present invention obtains the following advantageous effects.
1. Reduce pollution load, improve system stability: the main components of the livestock and poultry wastewater foam are soluble protein, polypeptide, polysaccharide, amino acid and other substances which are cross-linked with the soluble protein and the polypeptide, substances with surface activity (such as protein) are separated from a water body in a bubbling mode, meanwhile, some easily degradable organic matters (such as polypeptide, polysaccharide and lipid substances) are separated from the water body, and quality-based treatment is the key for solving the problem of foaming of a biological pond, so that the pollution load of a biological treatment process can be effectively reduced, and the stability of a sewage treatment system is improved;
2. reducing foam and ensuring normal operation of biochemical treatment process: the sewage containing surface active substances such as soluble protein, polypeptide and the like can generate a lot of foams after entering a biological treatment process, the foams are generally large in amount and very stable, and if the sewage is not treated in time, the sewage treatment process can be seriously influenced. The method can reduce the foam of the biological system, thereby ensuring the normal operation of the biochemical treatment process;
3. the concentrated liquid fertilizer is produced, the cost is low, and the efficiency is high: the livestock and poultry breeding wastewater after anaerobic treatment contains a large amount of soluble protein, polysaccharide, humic acid, cellulose and the like, foams have the functions of trapping and concentrating the substances, and defoaming solution after foam coalescence contains high-concentration protein and polysaccharide, and also contains 17 amino acids, various types of humic acid, polybasic organic acid, various relatively healthy plant growth regulators, B vitamins and other organic matters which have the effects of promoting the growth of crops and inhibiting the occurrence of plant diseases and insect pests. Organic matters are removed at this stage, the content of foaming substances is reduced, the stability of a subsequent biochemical system is improved, the recycling of the cow breeding wastewater is fully realized, and the method has important significance for energy conservation, consumption reduction and even increase of benefit.
Drawings
FIG. 1 is a flow diagram of a wastewater treatment process of the present invention intended to show the reflux of a foam separation concentrate to an anaerobic reaction process;
FIG. 2 is a flow diagram of the wastewater treatment process of the present invention aimed at showing the direct immersion of the foam separation concentrate into the lagoon;
FIG. 3 is a flow chart of the wastewater treatment process of the present invention for indicating that the foam separation concentrate can be used as a liquid fertilizer raw material.
Detailed Description
The present invention will be further described with reference to examples.
The invention provides an anaerobic reaction-solid-liquid separation-foam separation-two-stage AO-chemical dephosphorization-oxidation pond combined process which can lead the effluent to be stably discharged after reaching the standard, effectively reduces the foam of a biological pond under the conditions of low energy consumption and no use of a chemical defoaming agent, obviously reduces the operation load of the biological pond, and has strong shock load resistance, good treatment effect and stable operation. The specific process flow is as follows:
1. the SS concentration of the breeding wastewater is high, a certain pretreatment measure is needed before the breeding wastewater enters an anaerobic system, a coarse grid and a special cow dung wastewater solid-liquid separator are adopted to remove suspended solids and dung residues, then suspended matters heavier than water are separated from the water by a precipitation method, and the dung residues generated by the grid/solid-liquid separator, a primary sedimentation tank and a solid-liquid separation/centrifugal process can be dried and then can be recycled as livestock bedding or aerobic compost.
2. The anaerobic reaction/CSTR/IC reactor has strong impact resistance: the sludge on the upper part of the sludge bed is in a suspended state and is beneficial to the degradation of organic matters by means of the rising motion of the methane generated in the processes of water flow and fermentation without a mixing and stirring device; SS in the anaerobic reactor inlet water needs to be properly controlled to prevent the influence on the treatment effect. The effluent needs to be treated by solid-liquid separation means such as centrifugation and the like, solid matters in the sewage are further filtered, and the filtered matters can be recycled as fertilizer after being dried.
3. The foam separation method is a technique for separating components based on the difference in surface activity between different components in a liquid. The surface active substances which are easy to foam in the livestock wastewater mainly comprise soluble proteins, polypeptides, and polysaccharides, amino acids and other substances which are cross-linked with the soluble proteins and polypeptides, and the substances with surface activity are separated from the water body in a bubbling mode, and meanwhile, some organic substances (such as polypeptides, polysaccharides and lipid substances) which are easy to degrade are separated from the water body, so that the pollution load of a biological treatment process is effectively reduced, and the stability of a sewage treatment system is improved. The separated foam can be naturally broken and digested after 1-2 hours to form concentrated liquid, the easily degradable organic matters (such as polypeptide, polysaccharide and lipid substances) in the liquid have a large proportion and are easily biodegradable, and three directions are provided:
(1) and then the organic matters are refluxed to an anaerobic reactor or anaerobic fermentation equipment, and the organic matters are further degraded by the rising motion of the water flow and the methane generated in the fermentation process (as shown in figure 1).
(2) The wastewater passes through the biochemical treatment unit and directly reaches a terminal oxidation pond, and the retention time of water in the oxidation pond is 30-60 days, and the wastewater is subjected to sufficient biological oxidation degradation (as shown in figure 2).
(3) The foam digestion solution reaching a certain concentration can be used as a raw material for preparing the liquid fertilizer through treatment such as filtration (as shown in figure 3).
4. Two-stage AO, is a nitrification/denitrification process. The preposed anoxic pond utilizes nitrate nitrogen in the reflux mixed liquor and organic matters in the raw sewage to carry out denitrification, after the effluent enters the preposed aerobic pond, the organic matters are oxidized, the nitrogen-containing organic matters are ammoniated, ammonia nitrogen is nitrified, and simultaneously the preposed denitrification generates N2The aerobic pool is released by aeration stripping. The effluent of the front aerobic tank enters a rear anoxic tank for endogenous denitrification, and the generated N2And aerating and stripping in the post-aerobic tank, and simultaneously nitrifying the ammonia nitrogen generated by endogenous metabolism in the post-aerobic tank. Through the carbon oxidation-nitrification-denitrification processes for many times, most of organic matters and ammonia nitrogen in the wastewater are converted into inorganic matters to be removed from the water, and a small part of the organic matters and ammonia nitrogen are converted into cell matters, and the cell matters are discharged out of the system through periodic sludge discharge. The denitrification rate of the process can reach 90-95%.
5. And (3) concentrating and conditioning residual sludge generated in the subsequent sedimentation tank, then dehydrating the residual sludge in a sludge dehydrator, and returning the dehydrated sludge as biogas manure to the field.
6. The effluent water in the wastewater after biochemical treatment decolors colored substances in the wastewater through a strong oxidant (ozone and photocatalytic hydroxyl free radicals), and simultaneously can kill most pathogenic microorganisms in the wastewater, so that the pathogenic microorganisms are prevented from entering the environment.
7. The oxidation pond belongs to a land treatment system for sewage, generally consists of bacteria, algae, various microorganisms and the like, and all parts act together to form a complex natural biological treatment system. The sewage is further treated and purified in a physicochemical and biological way through adsorption, precipitation, microbial degradation and other ways in the ecological system, so that the energy conservation and emission reduction of the sewage are effectively realized. The effluent can be discharged after reaching standards or recycled to wash cowsheds and the like.
The invention is realized by the following process steps and process conditions:
(1) firstly, filtering forage scraps, animal hairs and the like with large particle sizes from the wastewater of a dairy farm by a 5-20 mm grid/solid-liquid separator, preliminarily removing silt and organic matters with large specific gravity from the wastewater by a primary sedimentation tank, conveying the wastewater to an anaerobic reactor through a pipeline, fully degrading the organic matters after anaerobic fermentation treatment of the anaerobic reactor, wherein the generated biogas can be used as a sewage treatment system for heating, and the redundant biogas can be comprehensively utilized as clean energy;
(2) feeding waste inside the anaerobic reactor into a 50-200 mesh centrifugal solid-liquid separator to obtain separated solid and liquid, wherein the solid is used as a composting material, and the liquid enters subsequent organisms;
(3) the hydraulic retention time of the anaerobic reactor is 15-35 days, and the temperature is maintained at 25-40 ℃;
(4) the foam separation equipment adopts multistage bubbling separation, the gas-water ratio of separation is 20-50, the temperature is 5-40 ℃, the separation time is 1-5 h, the pH of a reaction system is controlled at 5-8, and the concentrated solution accounts for 15-20%.
Example 1
The water quality indexes of the breeding wastewater of a certain cow measured in 25 days in 2021 and 4 months are as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 47600 | 35400 | 1820 | 3300 | 460 | 10 |
This example employed the treatment process shown in FIG. 1
(1) Firstly, filtering forage scraps, animal hairs and the like with large particle sizes from the wastewater of a dairy farm by a 5-20 mm grid/solid-liquid separator, preliminarily removing silt and organic matters with large specific gravity from the wastewater by a primary sedimentation tank, and conveying the wastewater to an anaerobic reactor through a pipeline;
(2) organic matters are fully degraded after anaerobic fermentation treatment of the anaerobic reactor, the generated methane can be used as a sewage treatment system for heating, and the redundant methane can be used as clean energy for comprehensive utilization; feeding waste materials in the anaerobic reactor into a 60-200-mesh centrifugal solid-liquid separator to obtain separated solid and liquid, wherein the solid is used as a composting material, and the liquid enters a subsequent treatment process;
(3) the hydraulic retention time of the anaerobic reactor is 20 to 30 days, and the temperature is maintained at 20 to 40 ℃;
the effluent quality of the anaerobic reactor at 21 days 5 and 2021 is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 28040 | 24200 | 2180 | 3800 | 420 | 10 |
(4) The foam separation equipment is used for multi-stage bubbling separation, the gas-water ratio of separation is 20-50, the temperature is 5-40 ℃, the separation time is 1-5 h, the pH of a reaction system is controlled at 5-8, and the concentrated solution accounts for 15-20%;
the quality of the effluent of the concentrated solution of the foam separation equipment in 2021, 5 months and 21 days is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 37360 | 60520 | 2593 | 10700 | 480 | 10.5 |
The water quality of the effluent pool of the foam separation equipment is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 17360 | 7250 | 1693 | 6500 | 380 | 5 |
(5) Biological reactions
Through the oxidation-nitrification-denitrification process of the two-stage biological pond, most of organic matters and ammonia nitrogen in the wastewater are converted into inorganic matters to be removed from the water, and a small part of the organic matters and ammonia nitrogen are converted into cell matters, and the cell matters are discharged out of the system through periodic sludge discharge. The process control parameters are as follows:
(6) oxidation pond
The effluent quality of the oxidation pond in 2021, 6 months and 12 days is as follows:
| COD(mg/L) | NH3-N(mg/L) | SS(mg/L) | TP(mg/L) |
| 150 | 23 | 45 | 40 |
example 2
The water quality indexes of the breeding wastewater of a certain cow in 2021, 5 and 18 months are as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 48600 | 34240 | 1820 | 3540 | 380 | 9 |
This example employed the treatment process shown in FIG. 2
(1) Filtering wastewater of a dairy farm by a 5-20 mm grid/solid-liquid separator;
(2) feeding waste materials in the anaerobic reactor into a 50-200-mesh centrifugal solid-liquid separator to obtain separated solids serving as compost materials, and feeding liquid into a subsequent treatment process;
(3) the hydraulic retention time of the anaerobic reactor is 15-35 days, and the temperature is maintained at 25-40 ℃;
the effluent quality of the anaerobic reactor at 6 months and 21 days in 2021 is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 27600 | 23400 | 2260 | 3700 | 420 | 9.5 |
(4) The foam separation equipment adopts multistage bubbling separation, the gas-water ratio of separation is 30-55, the temperature is 30-40 ℃, the separation time is 2-4 h, the pH of a reaction system is controlled at 6-8, and the concentrated solution accounts for 15-25%.
The quality of the outlet water of the concentrated solution of the foam separation equipment in 2021, 6 months and 22 days is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 38480 | 61250 | 1560 | 9200 | 580 | 10 |
The water quality of the effluent pool of the foam separation equipment is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 14340 | 7360 | 1430 | 4680 | 320 | 5 |
(5) Biological reactions
The process control parameters are as follows after the oxidation-nitrification-denitrification process of the two-stage biological pond:
(6) effluent of oxidation pond
The quality of effluent of the oxidation pond is as follows in 2021 year, 6 month and 21 day:
| COD(mg/L) | NH3-N(mg/L) | SS(mg/L) | TP(mg/L) |
| 220 | 30 | 35 | 68 |
example 3
The water quality indexes of the breeding wastewater of a certain cow in 2021, 4 months and 15 days are as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 46800 | 34100 | 1840 | 3600 | 420 | 10 |
This example employed the treatment process shown in FIG. 3
(1) Firstly, passing the wastewater of a dairy farm through a 5-20 mm grid/solid-liquid separator, and conveying the liquid to an anaerobic reactor through a pipeline;
(2) feeding the discharged material in the anaerobic reactor into a 50-200 mesh centrifugal solid-liquid separator to obtain separated solid and liquid, wherein the solid is used as a composting material, and the liquid enters a subsequent treatment process;
(3) the hydraulic retention time of the anaerobic reactor is 25-35 days, and the temperature is maintained at 35-40 ℃;
the effluent quality of the anaerobic reactor at 21 days 5 and 2021 is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 24800 | 25600 | 2050 | 3600 | 410 | 9 |
(4) The foam separation equipment is used for multi-stage bubbling separation, the gas-water ratio of separation is 20-50, the temperature is 5-40 ℃, the separation time is 4-5 h, the pH of a reaction system is controlled at 7-8, and the concentrated solution accounts for 15% -25%;
the quality of the effluent of the concentrated solution of the foam separation equipment in 2021, 5 months and 21 days is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 36800 | 58400 | 1450 | 6400 | 540 | 11 |
(5) Biological reactions
The sludge is periodically discharged out of the system through the oxidation-nitrification-denitrification processes of the two-stage biological pond. The quality of inlet water of the biological pond in 5 and 21 months in 2021 is as follows:
| COD(mg/L) | SS(mg/L) | NH3-N(mg/L) | TN(mg/L) | TP(mg/L) | viscosity (mPa. S) |
| 17800 | 13600 | 1300 | 2100 | 290 | 6 |
The process control parameters are as follows:
(6) effluent of oxidation pond
The quality of the effluent of the oxidation pond is as follows in 2021, 6 months and 26 days:
| COD(mg/L) | NH3-N(mg/L) | SS(mg/L) | TP(mg/L) |
| 140 | 23 | 30 | 65 |
the embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A method for reducing the treatment load of cow breeding wastewater is characterized by comprising the following steps: the method comprises the following steps:
s1, pretreating wastewater of a dairy farm;
s2, carrying out anaerobic fermentation treatment on the pretreated wastewater;
s3, performing foam separation on the wastewater after anaerobic fermentation to obtain foam and a water body;
s4, carrying out two-stage nitrification/denitrification reaction on the separated water body;
s5, carrying out oxidation reaction on the water body after biochemical treatment;
and S6, discharging the water body after the oxidation reaction into an oxidation pond.
2. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: in step S1, the preprocessing method includes: and removing suspended solids and feces in the wastewater by adopting a 5-20 mm grid or a solid-liquid separator, and then performing precipitation treatment to remove suspended matters with specific gravity larger than that of water.
3. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: in step S2, the hydraulic retention time of the anaerobic reactor is 15-35 days, and the temperature is maintained at 20-40 ℃.
4. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: in step S2, after the anaerobic reaction, the product is sent to a 50-200 mesh centrifugal solid-liquid separator to obtain separated solid and liquid, and the liquid is subjected to foam separation.
5. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 4, wherein the method comprises the following steps: and (3) carrying out livestock bedding making or aerobic composting treatment on the solid matters obtained after pretreatment and the solid matters obtained after anaerobic reaction centrifugation.
6. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: in the step S3, the foam separation is multi-stage bubbling separation, the gas-water ratio of the separation is 20-55, the temperature is 5-40 ℃, the separation time is 1-5 h, the pH of the reaction system is controlled at 5-8, and the concentrated solution accounts for 15% -25%.
7. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: in step S3, the separated foam is subjected to anaerobic fermentation reaction in step S2 or enters the oxidation pond in step S6 or is used for preparing liquid fertilizer.
8. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: and carrying out two-stage nitrification/denitrification reaction on the water body, then carrying out precipitation treatment to obtain the water body and sludge, and carrying out biogas manure treatment on the sludge.
9. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: in step S5, the oxidizing agent used in the oxidation reaction is selected from ozone or photocatalytic hydroxyl radical.
10. The method for reducing the treatment load of the dairy cow breeding wastewater according to claim 1, wherein the method comprises the following steps: in the step S6, the retention time of the water in the oxidation pond is 30-60 days.
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