CN111675439A - High-efficient beasts and birds are bred effluent disposal system - Google Patents
High-efficient beasts and birds are bred effluent disposal system Download PDFInfo
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- CN111675439A CN111675439A CN202010566406.1A CN202010566406A CN111675439A CN 111675439 A CN111675439 A CN 111675439A CN 202010566406 A CN202010566406 A CN 202010566406A CN 111675439 A CN111675439 A CN 111675439A
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention discloses a high-efficiency livestock and poultry breeding wastewater treatment system, and belongs to the field of environmental protection. This system includes catch basin, air supporting pond, UASB reactor, aeration filter and high-efficient nitrogen and phosphorus removal reactor, and the output of grid ditch links to each other with the catch basin, the output of catch basin bottom loop through air supporting pond, UASB reactor, aeration filter, high-efficient nitrogen and phosphorus removal reactor, membrane biological filter and link to each other with the clean water basin. The invention provides a high-efficiency livestock and poultry breeding wastewater treatment system, which can effectively remove COD (chemical oxygen demand) and ammonia nitrogen and reduce total nitrogen and total phosphorus at the same time.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a high-efficiency livestock and poultry breeding wastewater treatment system.
Background
In recent years, the livestock and poultry industry in China has developed at a high speed, but most of wastewater generated by livestock and poultry breeding and large-scale livestock and poultry industry has become one of the main sources of water pollution. If the livestock and poultry wastewater is discharged from the open air, the livestock and poultry wastewater can not only cause serious damage to surface water and underground water, but also seriously affect the ecological system of the farmland and destroy the ecological environment. The problem of environmental pollution caused by the discharge of livestock and poultry breeding wastewater becomes one of the important bottlenecks restricting the healthy development of livestock and poultry breeding industry and the ecological civilization construction in China.
The technology commonly used in China at present takes pretreatment, regeneration treatment and final advanced treatment as basic treatment processes, wherein the pretreatment mainly comprises physicochemical treatment, mainly adsorption, flocculation precipitation, Fenton oxidation and the like, and the biochemical treatment mainly comprises biological treatment, mainly anaerobic biological treatment and aerobic biological treatment. At present, the process of combining anaerobic treatment and aerobic treatment is commonly used, benite and the like adopt the combined process of anaerobic SBR and aerobic SBR to treat the pig farm breeding wastewater, the average removal rate of total organic carbon in the test reaches 85%, the removal rate of ammonia nitrogen reaches 97%, the removal rate of total nitrogen is only 58.5%, the effect is not ideal, aerobic SBR effluent needs to flow back to the anaerobic SBR, the hydraulic retention time reaches 22-30 days, the removal effect of the total nitrogen by the conventional method is not good, and the long HRT causes the large floor area of equipment. Through the first pollution source general investigation, the COD discharge amount of a pig farm in China reaches 30 percent of the total amount of agricultural sources, nitrogen accounts for 30 percent, and phosphorus accounts for more than 40 percent.
The prior art has the following defects:
(1) because the pollutants in the wastewater are gradually reduced by a multi-stage physical, chemical and biological method, and the solid-liquid-gas separation is continuously carried out, the prior art is complex in process;
(2) the existing process is mainly realized by a multi-stage AO process, denitrifying bacteria and phosphorus accumulating bacteria compete for a carbon source in the AO process to cause the inhibition of the growth of the bacteria, and the denitrification and dephosphorization effects are unstable;
(3) PAC and PAM are added in a large amount, so that the wastewater treatment cost is improved;
(4) as the prior art AO mainly applies an activated sludge method, the retention time is long, and the occupied area of the structure is large.
Disclosure of Invention
The invention aims to provide a high-efficiency livestock and poultry breeding wastewater treatment system aiming at the problems in the prior art.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a high-efficient beasts and birds are bred effluent disposal system, this system includes catch basin, air supporting pond, UASB reactor, aeration filter and high-efficient nitrogen and phosphorus removal reactor, and the output of grid ditch links to each other with the catch basin, the output of catch basin bottom loop through air supporting pond, UASB reactor, aeration filter, high-efficient nitrogen and phosphorus removal reactor, membrane biological filter and clear water basin and link to each other.
The technical scheme of the invention is as follows: the grid ditch in be equipped with the thin grid of machinery, the thin grid of machinery is that the grating width is 0.5 ~ 1.5mm, the grid interval is 3 ~ 8mm, and the thin grid inclination of machinery is 70 ~ 80. Solid suspended matters, gravels, wastes and other impurities with larger particle sizes in the wastewater of livestock and poultry farms are screened out by using a mechanical grid, and the feces and wastewater after the wastewater is filtered by a grid channel enters a water collecting tank for temporary storage.
The technical scheme of the invention is as follows: the air floatation tank is provided with a dissolved air tank and an air compressor connected with the dissolved air tank. The dissolved air tank receives air output by an air compressor, the pressure of the dissolved air tank is controlled, the air is compressed, the dissolved air is introduced into a contact zone through a dissolved air releaser and contacts with sewage in the contact zone, the contact time is controlled to be 5 minutes, then the dissolved air enters a separation zone to separate animal and vegetable oil, the retention time of the separation zone is 20 minutes, and the action principle of the dissolved air tank is a technology that compressed air is introduced into oil-containing sewage to generate micro bubbles in the water, so that floating oil, dispersed oil or suspended particles in the water with the particle size of 0.25-25 mu m in the sewage are attached to the bubbles and float to the water surface along with the bubbles to be recovered. Can reduce COD and ammonia nitrogen concentration, simultaneously remove a large amount of SS and oils, and the effluent enters the lower part of the UASB reactor.
The technical scheme of the invention is as follows: the bottom of the UASB reactor is connected with an outer sieve type solid-liquid separator. The upper part of the UASB reactor is provided with a three-phase separator, and the gas output end of the three-phase separator is connected with a methane tank, a dehydration and purification device and a steam boiler in sequence.
The technical scheme of the invention is as follows: the UASB reactor three-phase separator is connected with a methane tank, and the tank body is provided with a heat-preservation jacket which is provided with a thermometer, an air inlet pipe and an air outlet. The methane tank is provided with a pressure gauge, gases such as methane generated by anaerobic digestion and the like are collected through the methane tank, the volume of the gases in the methane tank is concerned through the pressure gauge, the gases are periodically dehydrated, adsorbed, purified and collected, and the collected methane gases can be used for heating a boiler when the temperature is low, so that the efficient operation of the reactor is kept. In UASB reactors, wastewater is introduced into the bottom of the reactor as uniformly as possible and the wastewater passes upward through a sludge bed containing granular sludge or flocculent sludge. The anaerobic reaction occurs during contact between the wastewater and the sludge particles. Biogas (mainly methane and carbon dioxide) produced under anaerobic conditions causes internal circulation, which facilitates the formation and maintenance of granular sludge. The temperature of the reactor is maintained between 30 and 40 ℃, the pH value is controlled between 6 and 8, a large amount of organic matters and SS are removed through anaerobic decomposition for 72 hours, and the flow of the circulating pump is set to be twice of that of the water inlet pump. The effluent of the UASB reactor enters an aeration biological filter, and the lower layer biogas residue is periodically discharged to an inclined screen type solid-liquid separator. The inclined screen type solid-liquid separator is connected with the lower part of the UASB reactor, the adding amount of PAC with the adding concentration of 10% is 2mL/L, the adding amount of PAM with the concentration of 2 per mill is 1mL/L, the lower biogas residue is periodically subjected to solid-liquid separation, solids are collected and transported outwards, and liquid flows back to the front end of the aeration tank.
The technical scheme of the invention is as follows: the Biological Aerated Filter (BAF) is a contact filter, the BAF has the functions of biological oxidation degradation and filtration on wastewater, and is beneficial to removing a large amount of COD, ammonia nitrogen and SS, the filter is divided into a water distribution area, a filling area, a clear water area, a water distribution system, an aeration system and a back flushing system, and the operation modes of lower water inlet and upper water outlet are used. The water distribution area and the water distribution system mainly play a role in enabling the reactor to uniformly feed water, and the water distributor uses a long-handle filter head and is uniformly distributed on a water distribution plate. The aeration system is arranged above the water distribution system, the aeration pipe is aerated by adopting a phi 65mm micropore aeration hole, the Roots blower is used for aeration, and the dissolved oxygen in the pool is controlled to be 4-5 mg/L by controlling the frequency of the motor and the opening degree of the control valve. The filler zone supporting layer uses cobblestones to play a role in supporting the filler, and the biological filler uses light ceramic particles to provide attachment points for the growth of microorganisms. The backwashing system is supplied with water after treatment collected in the clear water tank, the backwashing system is supplied with air by using a Roots blower, the water washing is carried out for 10 minutes, the air/water combined flushing is carried out for 10 minutes, the backwashing period is 24 hours, the pH value of the supplied water is preferably 6-9, the temperature is 10-40 ℃, and the retention time is 12 hours.
The technical scheme of the invention is as follows: the high-efficiency denitrification and dephosphorization reactor comprises a water distribution area, a filler area, a clear water area and a backwashing system, wherein the running modes of lower water inlet and upper water outlet are adopted, the water distribution area and the water distribution system mainly play a role in enabling the reactor to uniformly feed water, and the water distributor uses a long-handle filter head and is uniformly distributed on a water distribution plate. Cobblestones are used in the bearing layer of the packing layer, pyrite and volcanic rock are used as biological fillers, and the preparation proportion is 3: 1, the lower layer is pyrite, and the upper layer is volcanic rock. The pyrite is used as a filler, so that the total nitrogen and the total phosphorus can be removed simultaneously, and the volcanic rock can further filter precipitates generated by the reaction. The residence time of the reactor is 24 hours, the backwashing system uses a water pump to carry out single water backwashing, the backwashing period is 24 hours, and the water washing time is 30 minutes.
The membrane biofilter comprises an aeration system, a membrane component, a membrane cleaning system and a reflux system, and as the membrane biofilter completely separates hydraulic retention time from sludge age, the sludge concentration is high, the sludge discharge period is long, the interception rate of suspended solid particles is high, and the removal effect of COD, ammonia nitrogen and SS is further improved. The MBR aeration system adopts a perforated aeration pipe for aeration, utilizes a Roots blower as a gas supply source, controls the dissolved oxygen to be 2-4 mg/L and controls the membrane flux to be 0.29m3/m2D, the retention time is 4 hours, and the effluent enters a clean water tank. The reflux system is lifted by a sewage pump, and the reflux ratio is controlled to be 200%. The membrane module adopts a hollow fiber ultrafiltration membrane (Singapore Meineng), and the membrane is washed once by using sodium hypochlorite in 3 months.
The clean water tank is a final water outlet storage container, is in a direct drainage state under the normal condition, and provides a water source for backwashing reclaimed water backflushing when the reactor needs backwashing.
The invention has the beneficial effects that:
the invention aims to provide a high-efficiency livestock and poultry breeding wastewater treatment system for solving the problems of complex process, large reagent dosage, unstable denitrification and dephosphorization effect, long retention time and the like in the prior art, and the system can effectively remove COD (chemical oxygen demand) and ammonia nitrogen and reduce total nitrogen and total phosphorus.
Drawings
FIG. 1 is a schematic view of the high-efficiency livestock and poultry breeding wastewater treatment system of the invention.
Wherein: the device comprises a grid channel 1, a water collecting tank 2, an air compressor 3, a dissolved air tank 4, an air flotation tank 5, a steam boiler 6, a dehydration and purification 7, a methane tank 8, a UASB reactor 9, an aeration filter tank 10, a fan 11, a high-efficiency denitrification and dephosphorization reactor 12, a membrane biofilter 13, a fan 14, a clean water tank 15, an outer sieve type solid-liquid separator 16, a vehicle transportation treatment 17 and an 18-position three-phase separator.
Detailed Description
The invention is further illustrated by the following examples, without limiting the scope of the invention:
as shown in figure 1, a high-efficient beasts and birds are bred effluent disposal system, this system includes catch basin 2, air supporting pond 5, UASB reactor 9, aeration filter 10 and high-efficient nitrogen and phosphorus removal reactor 12, and the output of grid ditch 1 links to each other with catch basin 2, the output of catch basin bottom loop through air supporting pond 5, UASB reactor 9, aeration filter 10, high-efficient nitrogen and phosphorus removal reactor 12, membrane biological filter 13 and link to each other with clean water basin 15.
The grid ditch in be equipped with the thin grid of machinery, the thin grid of machinery is that the grating width is 0.5 ~ 1.5mm, the grid interval is 3 ~ 8mm, and the thin grid inclination of machinery is 70 ~ 80.
The air flotation tank 5 is provided with a dissolved air tank 4 and an air compressor 3 connected with the dissolved air tank 4 in a matching way.
The bottom of the UASB reactor 9 is connected with an external sieve type solid-liquid separator 16.
The upper part of the UASB reactor 9 is provided with a three-phase separator 18, and the gas output end of the three-phase separator 18 is connected with the methane tank 8, the dehydration and purification device 7 and the steam boiler 6 in sequence.
Under the condition of a laboratory, the water quality condition of the wastewater is artificially prepared: the COD is 30000mg/L, the ammonia nitrogen is 3000mg/L, the total nitrogen is 3500mg/L, the total phosphorus is 40mg/L, and the animal and vegetable oil is 600 mg/L.
The experimental process is simulated, 50L of simulated wastewater has the flow of 10ml/min, sewage is firstly filtered by a filter screen, then the sewage passes through a small-scale air floatation device, an air compressor is started, an air inlet valve of a dissolved air tank is opened, compressed air is pressed into a pressurized container, the pressure reaches 0.4Mpa of a table, the air inlet valve is closed and kept for 12min, then a releaser is started, so that the water passing through the dissolved air enters an air floatation tank to be mixed with raw water, and the retention time is 0.5 h. And then the effluent enters a UASB reactor, is subjected to light-tight culture at 32 ℃ for 48 hours in a constant temperature incubator, the reacted fermentation broth enters an aeration filter, stays for 48 hours, the effluent enters a high-efficiency denitrification and dephosphorization reaction column, stays for 24 hours, and finally the effluent enters a small-sized membrane bioreactor and is controlled by a diaphragm pump to flow back to the high-efficiency denitrification reaction column, and the stay time is 6 hours. The COD of the final effluent is 296 +/-19 mg/L, the ammonia nitrogen is 31.7 +/-3.9 mg/L, the total nitrogen is 68.4 +/-1.5 mg/L, the total phosphorus is 3.1 +/-0.4 mg/L, and the animal and vegetable oil is 71 +/-3 mg/L.
The same pretreatment + anaerobism + two-stage AO + precipitation + simulated oxidation pond was used for the test to produce a of the same volume a.
Claims (5)
1. The utility model provides a high-efficient beasts and birds are bred effluent disposal system which characterized in that: the system comprises a water collecting tank (2), an air flotation tank (5), an UASB reactor (9), an aeration filter tank (10) and a high-efficiency denitrification and dephosphorization reactor (12), wherein the output end of a grid canal (1) is connected with the water collecting tank (2), and the output end of the bottom of the water collecting tank is sequentially connected with the air flotation tank (5), the UASB reactor (9), the aeration filter tank (10), the high-efficiency denitrification and dephosphorization reactor (12), a membrane biological filter tank (13) and a clean water tank (15).
2. The high-efficiency livestock and poultry breeding wastewater treatment system according to claim 1, which is characterized in that: the grid ditch in be equipped with the thin grid of machinery, the thin grid of machinery is that the grating width is 0.5 ~ 1.5mm, the grid interval is 3 ~ 8mm, and the thin grid inclination of machinery is 70 ~ 80.
3. The high-efficiency livestock and poultry breeding wastewater treatment system according to claim 1, which is characterized in that: the air flotation tank (5) is provided with a dissolved air tank (4) and an air compressor (3) connected with the dissolved air tank (4).
4. The high-efficiency livestock and poultry breeding wastewater treatment system according to claim 1, which is characterized in that: the bottom of the UASB reactor (9) is connected with an external sieve type solid-liquid separator (16).
5. The high-efficiency livestock and poultry breeding wastewater treatment system according to claim 1, which is characterized in that: the upper part of the UASB reactor (9) is provided with a three-phase separator (18), and the gas output end of the three-phase separator (18) is connected with a methane tank (8), a dehydration and purification device (7) and a steam boiler (6) in sequence.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116282488A (en) * | 2022-09-27 | 2023-06-23 | 南京华创环境技术研究院有限公司 | An airlift reactor for deep nitrogen and phosphorus removal |
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