WO2019178841A1 - Intensive dairy farm breeding wastewater drip-irrigation system and operation management method therefor - Google Patents

Abstract

Disclosed are an intensive dairy farm breeding wastewater drip-irrigation system and an operation management method therefor, which relate to the technical field of wastewater treatment. The system comprises a grating (24), a water distribution well (25), animal housings (26), a micronano bubble generation device (27), a water source pre-treatment system, an advanced treatment system and a drip-irrigation pipe network. The water distribution well (25) is connected to water inlets of the animal housings (26) and an inlet of the micronano bubble generation device (27) by means of pipelines, respectively; an outlet of the micronano bubble generation device (27) is connected to a purified water inlet of the advanced treatment system; and sewage outlets of the animal housings (26), the grating (24), an inlet and an outlet of the water source pre-treatment system, and a sewage inlet and outlet of the advanced treatment system are successively connected to an inlet of the drip-irrigation pipe network in sequence. In the method, an advanced treatment method for complicated quality of breeding wastewater and the operation management method for reusing the breeding wastewater in an agricultural irrigation system by means of the drip-irrigation technology are comprehensively taken into consideration during design. The problems, such as the blockage of an irrigation emitter due to the reuse of breeding wastewater in farmland, are effectively solved, the system operates safely and allows safe and effective use of breeding wastewater.

Description

Intensive dairy farm aquaculture wastewater drip irrigation system and operation management method Technical field

The invention relates to the technical field of wastewater treatment, in particular to an intensive dairy farm dred irrigation system and operation management method.

Background technique

Although the rapid development of large-scale and intensive livestock and poultry breeding has effectively promoted agricultural production and the rural economy, it has also caused problems such as serious environmental pollution and increasingly prominent contradiction between water supply and demand. The reuse of aquaculture wastewater for agricultural irrigation provides an effective way for its resource utilization. However, due to the immature treatment process, poor water quality, excessive use or improper methods, the reuse of aquaculture wastewater for farmland irrigation may threaten crops, soil, and The environment is even human health. Drip irrigation technology is considered to be the safest and most effective way to irrigate poor quality water such as aquaculture wastewater because of its controllable quantity and targeted supply. However, the complicated water quality of aquaculture wastewater can easily cause clogging of the emitter, which directly affects the irrigation uniformity of the drip irrigation system. The service life, even in severe cases, can even cause system paralysis. Therefore, how to ensure efficient and safe operation of the aquaculture wastewater drip irrigation system is an important way to ensure the utilization of agricultural resources.

Controlling the water quality characteristics of the drip irrigation system is the most important and direct method to ensure the safe operation of the drip irrigation system and reduce the clogging of the emitter. At present, the advanced treatment methods for aquaculture wastewater include three methods: physicochemical treatment, biological treatment and natural ecosystem treatment. The natural ecosystem treatment method is more economical under the conditions of sufficient land resources, and usually after deep treatment. Non-chlorination disinfection and sterilization are required to ensure that the water quality hygiene standards are met. In addition, in recent years, the energy generated in the emerging micro-nano aeration sterilization is sterilized, and the disinfection efficiency is high and the potential danger is small, which provides a feasible sterilization and disinfection solution for the advanced treatment of the aquaculture wastewater. However, the related patent documents are not disclosed. . At present, there are only a few patent reports on the treatment of farmland wastewater after reuse of farmland wastewater. For example, Zhang Shihui and others of Luoping County Dingmu Breeding Professional Cooperatives disclosed a “Pig Farm Wastewater Treatment System” (ZL205442987U), which proposed a pig farm wastewater treatment system combined with an irrigation area to treat pig farm wastewater. Reuse of liquids on farmland irrigation. For example, Li Shujun of Harbin Jinda Environmental Engineering Co., Ltd. proposed in his patent “Aquaculture Wastewater Treatment Plant and Treatment Method” (CN105800859A) to treat aquaculture wastewater by degrading the roots and surrounding microorganisms of reeds and other surrounding microorganisms. Farmland irrigation. However, the related patents only mention the idea or overall arrangement of agricultural irrigation after treatment of aquaculture wastewater, and there is no water source treatment method for the aquaculture wastewater drip irrigation system, nor its suitable application mode and operation management method.

Based on the gaps in the current intensive dairy farm aquaculture wastewater drip irrigation system and its safe operation method, the present invention is based on the prior art and application process for the serious lack of efficient recycling of agricultural resources in intensive dairy farm aquaculture wastewater. An advanced treatment method for water quality under drip irrigation conditions for intensive dairy farm aquaculture wastewater and a long-term safe operation management method for drip irrigation system are proposed: comprehensive use of grid fouling, anaerobic treatment, land treatment system treatment, micro-nano bubbles Key technologies such as water (ozone) sterilization are used to treat the water source, so that the key water quality characteristics of the water source meet the basic requirements of farmland irrigation water quality; the automatic backwash sand filter + laminated filter grading filtration mode is used to control the water quality characteristic parameters entering the drip irrigation pipe network. In the non-sensitive section of the irrigator blockage; combined with periodic chemical chlorination + capillary flushing mode, reduce the enrichment and growth of plugging materials in the capillary tube and emitter, and ensure the long-term and efficient operation of the drip irrigation system. The method effectively solves the problem that the water quality condition in the irrigation process of farmland waste water reused is easy to cause the drip irrigation system to block, and the safe reuse of the culture wastewater and the efficient operation of the drip irrigation system are ensured.

Summary of the invention

In view of the problems raised in the background art, the present invention provides an intensive dairy farm aquaculture wastewater drip irrigation system, which comprises: a grid, a water distribution well, a barn, a micro-nano bubble generating device, a water source pretreatment system, The deep processing system and the drip irrigation pipe network; the water distribution well is connected to the water inlet of the animal house and the inlet of the micro-nano bubble generating device through the pipeline, and the outlet of the micro-nano bubble generating device is connected with the clean water inlet in the deep processing system, and the livestock house is connected The sewage outlet is connected to the inlet of the water source pretreatment system through the grid; the outlet of the water source pretreatment system, the inlet and outlet of the No. 1 pump, the sewage inlet and outlet of the deep treatment system, the inlet and outlet of the No. 8 pump, and the inlet of the drip irrigation pipe network are sequentially arranged. Connected.

The water source pretreatment system comprises: a first stage sedimentation tank and a sewage pump; the inlet and outlet of the first stage sedimentation tank are respectively the inlet and outlet of the water quality pretreatment system, and the first stage sedimentation tank is connected with a sewage pump leading to the sewage system, and the sedimentation is larger. The coarse particles are discharged through the sewage pump to the primary sedimentation tank.

The deep treatment system comprises: a hydrolysis acidification tank, an anaerobic treatment tank, a secondary sedimentation tank, a land treatment system, a water collection channel, a pretreatment tank, a sand filter, a disinfection tank, a water purification pool, a second pump, No. 3 pump, No. 4 pump, No. 5 pump, No. 6 pump, No. 7 pump, No. 8 pump, No. 9 pump, sludge return pump and micro-nano bubble generating device; the inlet of the hydrolysis acidification tank is the sewage of the deep treatment system At the inlet, the hydrolysis acidification tank is connected to the anaerobic treatment tank through the No. 2 pump, and the anaerobic treatment tank is connected to the second sedimentation tank through the No. 3 pump, and the second sedimentation tank is connected to the land treatment system through the No. 4 pump, the water collecting channel and the land. The slope of the treatment system is connected, and the water collection channel is connected to the pretreatment tank through the fifth pump. The connection pretreatment tank is connected to the sewage inlet of the sand filter through the sixth pump, and the clean water inlet of the sand filter is a deep treatment system. The water purification inlet, the sand filter outlet, the disinfection tank, the seventh pump and the clean water collection tank are connected in series through the pipeline, and the water quality monitoring point is also arranged on the pipeline between the disinfection tank and the clean water collection pool, and the disinfection tank passes No. 9 It is connected to the pretreatment tank; purification purification sump outlet for the export of deep processing system; outer secondary sedimentation tank is also connected to the sludge pumping to the anaerobic treatment tank sludge return pump.

The anaerobic treatment tank is sequentially connected to the driving biogas generator set and the farm lighting facilities to provide the power required for the farm lighting facilities and other electrical equipment.

The drip irrigation pipe network comprises: an adjustable proportional pump, a laminated filter and a drip irrigation belt; the inlet of the drip irrigation system is sequentially connected to the drip irrigation belt through a PVC pipe and a laminated filter; the PVC between the inlet of the drip irrigation system and the laminated filter An adjustable proportional pump is connected in parallel on the pipe.

An intensive dairy farm aquaculture wastewater drip irrigation system intensive dairy farm aquaculture wastewater operation management method, characterized in that the specific steps are divided into:

Step 1. Pretreating the water source for the aquaculture wastewater;

Step 2: performing deep treatment on the pretreated wastewater;

Step 3. Perform secondary filtration on the deep treatment and the primary filtered water source to ensure that the water quality of the drip irrigation operation is qualified;

Step 4. Perform drip irrigation and chlorination.

The water source pretreatment process of the step 1 is: after the culture wastewater enters the first-stage sedimentation tank, the acid-base neutralization and the primary precipitation can be carried out therein, and the precipitated coarse coarse particles are discharged to the primary sedimentation tank through the sewage pump, and are The dirt intercepted by the grid is transported to the harmless treatment field for further processing; and the primary sedimentation tank has the function of water volume regulation and storage.

The deep treatment process of the step 2: the culture wastewater in the first-stage sedimentation tank is lifted by the first pump and then enters the hydrolysis acidification tank, and is hydrolyzed and acidified in the hydrolysis acidification tank. By decomposing the organic matter of macromolecules into small molecular organic matter by hydrolysis of acidified bacteria, the insoluble organic matter is converted into soluble organic matter, which creates favorable conditions for subsequent treatment; the culture wastewater treated by hydrolysis and acidification is filtered and then upgraded by the second pump to The anaerobic treatment tank converts the organic matter in the water into inorganic matter by the metabolism of the hydrogen producing acetogen and the methane bacteria in the anaerobic treatment tank to generate biogas; the culture wastewater after the complete anaerobic treatment is filtered and then The pump is transported to the secondary sedimentation tank. In the secondary sedimentation tank, the precipitation of the activated sludge produced in the previous stage is mainly carried out, and the pH of the water is adjusted at the same time; for the precipitated activated sludge, a part of the sludge is refluxed by the sludge return pump. The oxygen treatment tank is used to make mud cakes for transportation; the aquaculture wastewater is fed by the secondary sedimentation tank or by the No. 4 pump into the land treatment system; the aquaculture wastewater is collected in the water collection channel connected to the slope by the land treatment system.

In the step 3, the second-stage filtration process is performed on the deep-stage treatment and the first-stage filtered water source: the wastewater is re-precipitated in the water collection channel, and the water quality adjustment is performed again; after the sedimentation and water quality adjustment in the water collection channel, The aquaculture wastewater enters the pre-treatment tank through the No. 5 pump, and the aquaculture wastewater is stored in the pre-treatment tank, and is filtered by the sand filter under the lifting of the No. 6 pump. The main purpose is to intercept the large-size particles in the water stream. And other impurities. In the process of primary filtration, the backwashing water source has a water flow pressure difference of 0.15 to 0.20 MPa for backwashing, and the backwashing water source uses a micro-nano bubble generator to generate an ozone source, using backwashing speed and duration according to The degree of pressure difference recovery is determined, the backwashing sewage is discharged to the water collecting channel for sedimentation and water quality adjustment again; the sewage enters the disinfection tank after being filtered by the sand filter for the first stage, and the micro-nano bubble generator is used for the aquaculture wastewater in the disinfection tank. Combined with the ozone source for micro-nano ozone aeration sterilization, the water quality monitoring point is set at the outlet of the disinfection tank. When the water quality qualified water enters the water purification pool through the No. 7 pump, the water quality is unqualified and then returned to the pre-treatment through the No. 9 pump. The water quality is adjusted in the pool, and the adjusted sewage is passed from the clean water collecting tank to the drip irrigation pipe network through the No. 8 pump, and the second filter is carried out through the laminated filter to further remove impurities in the water source.

During the drip irrigation operation in the step 4, the qualified irrigation water source after the treatment enters the drip irrigation belt for drip irrigation operation; in the step of performing the chlorination washing process in step 4, the adjustable proportion in the drip irrigation pipe network is required to be firstly passed. After adding the sodium hypochlorite solution to the water of the PVC pipe, the second filter is carried out through the laminated filter and enters the drip irrigation belt for chlorination and rinsing; the time of each chlorination is determined according to the residual chlorine concentration, and the capillary of the drip irrigation belt is washed. The flow rate at the end is 0.4-0.6 m/s, the active ingredient of the sodium hypochlorite solution is Cl ^- , and the frequency of chlorination is gradually increased according to the cumulative operation of the drip irrigation system.

The beneficial effects of the invention are:

1) Propose a new and complete water quality treatment and operation management method for intensive dairy farm drip irrigation system. In the design process, the method comprehensively considers the advanced treatment method of the complex water quality of the aquaculture wastewater and the operation management method of the drip irrigation system after the agricultural irrigation.

2) Based on the "Emission Standards for Livestock and Poultry Industry Pollutants", comprehensive consideration of the "Water Quality Standards for Farmland Irrigation" and "Technical Specifications for Micro-irrigation Engineering" for the water quality requirements of drip irrigation, and the comprehensive treatment method for intensive dairy farm aquaculture wastewater is proposed. It mainly includes key technologies such as grid fouling, deep pool aeration, land treatment system purification, micro-nano aeration sterilization, etc., and determines the core parameter control threshold in each key technical process.

3) Determine the key parameter combination mode of sand filter filter layer thickness, particle size grading and filtration speed suitable for intensive dairy farm aquaculture wastewater drip irrigation system, as well as the effective content of micro-nano bubbles and backwashing flow rate during backwashing process. Parameter thresholds and combination modes such as time and frequency, and then determine the configuration method of the classification filter system for sand filter + laminated filter under optimal parameters.

4) Proposed chemical chlorination (including residual chlorine concentration, duration, treatment frequency) + capillary rinsing (flushing flow rate, duration, treatment frequency) and other key parameter thresholds for aquaculture wastewater drip irrigation system, and established aquaculture wastewater drip irrigation system Block the operation method.

5) The intensive dairy farm drip irrigation system proposed by the invention is a long-term and high-efficiency operation mode, which effectively solves the problems of irrigator clogging, efficient system operation and safe utilization of aquaculture wastewater caused by farmland wastewater reuse farmland.

6) Applying the intensive dairy farm drip irrigation system and management operation method proposed by the invention, collecting 260 intensive dairy farm aquaculture wastewater for resource utilization, ensuring safe operation of the drip irrigation system for more than 350 hours.

DRAWINGS

1 is a schematic diagram of a system arrangement of an embodiment of an intensive dairy farm aquaculture wastewater drip irrigation system and operation management method according to the present invention;

2 is a flow chart of the advanced treatment of the quality of the aquaculture wastewater in the embodiment of the present invention;

In the figure: 1-first sedimentation tank, 2-hydrolysis acidification tank, 3-anaerobic treatment tank, 4-second sedimentation tank, 5-land treatment system, 6-water collection channel, 7-pretreatment tank, 8- Sand filter, 9-disinfecting tank, 10-water water collecting tank, 11-laminated filter, 12-drip belt, 13-first pump, 14-second pump, 15-third pump, 16-four Pump, 17-fith pump, 18-six pump, 19-seven pump, 20-eight pump, 21-ninth pump, 22-sewage pump, 23-sludge return pump, 24-grid, 25- distribution well, 26-barn, 27-micro-nano bubble generator, 28-water quality checkpoint, 29-adjustable proportional pump.

detailed description

Hereinafter, an embodiment of an intensive dairy farm aquaculture wastewater drip irrigation system and an operation management method according to the present invention will be further described with reference to the accompanying drawings.

As shown in Fig. 1, the system of the drip irrigation system of the present invention comprises a primary sedimentation tank 1, a hydrolysis acidification tank 2, an anaerobic treatment tank 3, a secondary sedimentation tank 4, a land treatment system 5, a water collection channel 6, and a pretreatment. Pool 7, sand filter 8, disinfection tank 9, clean water collection tank 10, laminated filter 11, drip irrigation belt 12, first pump 13, second pump 14, third pump 15, fourth pump 16, five No. 17, No. 6 pump 18, No. 7 pump 19, No. 8 pump 20, No. 9 pump 21, sewage pump 22, sludge return pump 23, grille 24, water distribution well 25, barn 26 and micro-nano bubble generation The device 27, the water quality detecting point 28 and the adjustable proportional pump 29;

The intensive dairy farm consists of a number of barns 26; the water distribution wells 25 are respectively connected to the water inlet of the barn 26 and the inlet of the micro-nano bubble generating device 27 via a pipe, and the net of the micro-nano bubble generating device 27 and the depth processing system The water inlets are connected, and the sewage outlet of the livestock house 26 is connected to the inlet of the water source pretreatment system through the grill 24; the outlet of the water source pretreatment system, the inlet and outlet of the first pump 13, the sewage inlet of the advanced treatment system, and the outlet of the advanced treatment system. The outlet of the eighth pump 20 and the inlet of the drip irrigation pipe network are sequentially connected;

The gap between adjacent grids in the grid 24 is 10~40mm (the middle grid is 20mm), the grid 24 is generally 45°-75° (60°), and the grating grid flow rate is generally 0.6-1.0. m / s (take 0.8m / s), the water depth before the gate is generally 0.2m;

The water quality pretreatment system comprises: a primary sedimentation tank 1 and a sewage pump 22; the inlet and outlet of the primary sedimentation tank 1 are respectively an inlet and outlet of the water quality pretreatment system, and the primary sedimentation tank 1 is also connected with a sewage pump 22 leading to the sewage system, and sedimentation The larger coarse particles that have passed down are discharged through the sewage pump 22 to the primary sedimentation tank 1.

The deep treatment system includes: a hydrolysis acidification tank 2, an anaerobic treatment tank 3, a secondary sedimentation tank 4, a land treatment system 5, a water collection channel 6, a pretreatment tank 7, a sand filter 8, a disinfection tank 9, and a water purification set. Pool 10, No. 2 pump 14, No. 3 pump 15, No. 4 pump 16, No. 5 pump 17, No. 6 pump 18, No. 7 pump 19, No. 9 pump 21 and sludge return pump 23; Hydrolysis acidification tank 2 inlet For the sewage inlet of the deep treatment system, the hydrolysis acidification tank 2 is connected to the anaerobic treatment tank 3 through the second pump 14, and the anaerobic treatment tank 3 is connected to the secondary sedimentation tank 4 through the third pump 15, and the secondary sedimentation tank 4 passes through four. The pump 16 is connected to the land processing system 5, the water collecting channel 6 is connected to the slope of the land processing system 5, and the water collecting channel 6 is connected to the pretreatment tank 7 through the fifth pump 17, and the pretreatment tank 7 is connected to the sixth pump 18 Connected to the sewage inlet of the sand filter 8, the clean water inlet of the sand filter 8 is the clean water inlet of the deep treatment system, the outlet of the sand filter 8, the disinfection tank 9, the seventh pump 19 and the clean water collection tank 10 is connected in series through the pipeline, and a water quality monitoring point 28 is also arranged on the pipeline between the disinfection tank 9 and the clean water collection tank 10, the disinfection tank 9 is connected to the pretreatment tank 7 through the No. 9 pump 21; the purified water outlet of the purified water collection tank 10 is the outlet of the deep treatment system; and the second sedimentation tank 4 is connected with the sewage which is pumped to the anaerobic treatment tank 3. Mud return pump 23;

The anaerobic treatment tank 3 is sequentially connected to drive the biogas generator set and the farm lighting facilities to provide farm lighting facilities and other electrical equipment;

The land treatment system 5 is a diffuse flow treatment system with a slope of 4%, and perennial alfalfa is planted within the treatment system;

The length, width and height of the pretreatment tank 7 are 3m, 4m, 5m respectively, the working water level is set to 2 meters, the design water level is set to 3 meters, the highest safe water level is set to 4.5 meters, and the lowest safe water level is set to 1 m;

In this embodiment, the sand filter 8 is a multi-tank joint operation mode, which enables continuous operation of the system and backwashing of the sand filter.

The drip irrigation pipe network comprises: an adjustable proportional pump 29, a lamination filter 11 and a drip irrigation belt 12; the inlet of the drip irrigation system is sequentially connected to the drip irrigation belt 12 by a PVC pipe and a lamination filter 11; the inlet of the drip irrigation system and the laminated filter 11 adjustable PVC pumps are connected in parallel with adjustable proportional pump 29; laminated filter 11 is used for secondary filtration, filtering fertilizer residue or dregs, adjustable proportional pump 29 for fertilization, dosing and chlorination; The outlet of the filter 11 is connected to a drip tape 12 which is used for drip irrigation operations.

In this embodiment, the maximum allowable displacement per day is 60m ³ , that is, the daily processing capacity is 60m ³ , and the system continues to operate, so the hourly processing capacity should be 2.5m ³ /h;

As shown in FIG. 2, the working process of the embodiment of the present invention meets the requirements of the water quality of the drip irrigation pipe network according to the "Water Quality Standard for Farmland Irrigation" and the "Technical Specification for Micro-irrigation Engineering", and the specific steps are as follows:

Step 1. Water source pretreatment of aquaculture wastewater:

The treatment process mainly includes a first-stage sedimentation tank 1; the aquaculture wastewater flows into the filter collection tank 1 through the grid 24, and the grid 24 intercepts the large-sized debris, and the impurities are collected through the sewage pipe; the aquaculture wastewater enters the first stage. After the sedimentation tank 1, the acid-base neutralization and primary precipitation can be carried out therein, and the precipitated coarse coarse particles are discharged to the primary sedimentation tank 1 through the sewage pump 21, and are transported to the harmless soil together with the dirt intercepted by the grid 24. The treatment field is further processed. In addition, the primary sedimentation tank 1 also has a function of water volume regulation and storage to some extent. Here, the grid 24 is obliquely placed in the filter pool 1, the gap of the grid is selected from 10 to 40 mm (middle grid) (take 20 mm), and the angle of the grid 24 is generally 45 to 75 (take 60). The gate-to-gate flow rate is generally 0.6 to 1.0 m/s (0.8 m/s), and the water depth before the gate is generally 0.2 m.

Step 2. Deep treatment of the pretreated wastewater:

The treatment process mainly flows through the hydrolysis acidification tank 2, the anaerobic treatment tank 3, the secondary sedimentation tank 4, the land treatment system 5, the water collection channel 6, the pretreatment tank 7, the sand filter 8, the disinfection tank 9, the purified water. Pool 10.

The culture wastewater in the first-stage sedimentation tank 1 is lifted by the first pump 13 and then enters the hydrolysis acidification tank 2, and is hydrolyzed and acidified in the hydrolysis acidification tank 2. By the action of hydrolyzing acidified bacteria, the organic matter of macromolecules is degraded into small molecular organic matter, and the insoluble organic matter is converted into soluble organic matter, which creates favorable conditions for subsequent processing. The cultured wastewater treated by hydrolysis and acidification is filtered and then upgraded to the anaerobic treatment tank 3 by the second pump 14, and the organic matter in the water is converted into inorganic by the metabolism of the hydrogen producing acetogen and the methane bacteria in the anaerobic treatment tank 3. Material, produce biogas. The biogas produced after desulfurization can be used to drive biogas generators to generate electricity for use in farm lighting facilities and other electrical equipment.

After the complete anaerobic treatment, the culture wastewater is filtered and sent by the No. 3 pump 15 to the secondary sedimentation tank 4. In the secondary sedimentation tank 4, the precipitation of the activated sludge produced in the previous stage is mainly carried out, and the pH adjustment of the water is performed at the same time. . The pH of the water body is maintained at 6.0 to 8.0. For the precipitated activated sludge, a part is returned to the anaerobic treatment tank 2 via the sludge return pump 23, and the other part is made into a mud cake. The aquaculture wastewater is fed by the secondary sedimentation tank 4 or by the fourth pump 16 into the land treatment system 5. Here, the surface flow treatment system is selected, perennial grasses are planted within the treatment system, and the aquaculture wastewater is controlledly dosed, so that the water flow can be fully purified during the slow flow along the slope, and the slope is generally 2% to 6%. At this stage, the water quality is provided while providing nutrients for grass growth. Perennial pasture can be used for livestock and poultry farming, reducing some of the farm's expenditure. The aquaculture wastewater passes through the land treatment system 5 and is collected in a water collection channel 6 connected to the slope foot.

Step 3. Perform second-stage filtration on the deep-processed and first-stage filtered water source to ensure that the water quality of the drip irrigation operation is qualified;

In this step, a method for securing the drip irrigation system of the embodiment of the present invention is described.

The sedimentation is carried out again in the water collecting channel 6, and the water quality adjustment is performed again. After the sedimentation and water quality adjustment in the water collecting channel 6, the aquaculture wastewater enters the pretreatment tank 7 through the fifth pump 17, and is subjected to primary filtration through the sand filter 8 under the lift of the sixth pump 18. The sand filter 8 selects the multi-tank joint operation mode to achieve continuous operation of the system and backwashing of the sand filter. When the system is running, the inlet pressure of the sand filter 8 is set to 0.3 MPa, and the filtration flow rate is 0.05 m/s. When the pressure difference between the inlet and outlet of the sand filter 8 reaches 0.15 MPa, the backwashing is started, and the backwashing is started. The micro-nano bubble water with dissolved oxygen is 4.0 mg/L, the backwashing flow rate is 0.02 m/s, and when the pressure difference falls back to 0.05 MPa, the backwashing sewage is discharged to the pretreatment tank for sedimentation and water quality adjustment.

The aquaculture wastewater is stored in the pretreatment tank 7 and subjected to primary filtration through the sand filter 8 under the lift of the sixth pump 18. The sand filter 8 selects the multi-tank joint operation mode to achieve continuous operation of the system and backwashing of the sand filter. Generally, the diameter of the single tank of the sand filter is 0.6 to 1.2 m, the thickness of the filter layer in the tank is 40 to 70 cm, and the filter material is selected from quartz sand having an effective particle diameter of 0.4 to 1.2 mm. During operation, the inlet pressure of the sand filter should be greater than or equal to 0.6 MPa, and the filtration flow rate should be 5 to 17 m ³ /h, that is, the flow rate is 0.03 to 0.09 m/s (calculated as a single can diameter of 1.0 m). Backwashing is performed when the pressure difference between the inlet and outlet is 0.15 to 0.20 MPa, and the backwashing is performed by a micro-nano bubble generator 27 combined with an ozone source having a dissolved oxygen of 4.0 to 6.0 mg/L of micro-nano bubble water. The backwashing flow rate is generally 0.005 to 0.025 m/s. When the pressure difference falls back to 0.05 MPa, the backwashed sewage is discharged to the water collecting channel for sedimentation and water quality adjustment.

The pre-treatment tank 7 sets the design water level, the highest safe water level and the lowest safe water level. When the water quality is continuously unqualified, the pre-treatment tank 7 will continue to operate continuously, and the water level will continuously rise. If the water level is higher than the design water level and the highest safe water level is not reached. , gradually reduce the amount of water treatment per hour to slow the influent water, if the water level reaches a safe water level, suspend the processing system for troubleshooting. In addition, when the water level is lower than the minimum safe water level, the water is stopped, and when the water level returns above the minimum working water level, the water is recovered.

After passing through the first stage filtration of the sand filter 8, the water enters the disinfection tank 9. In the disinfection tank 9, the micro-nano bubble generator 27 is combined with the ozone source for microbial ozone aeration sterilization in the disinfection tank 9, each time for 30 minutes, ozone The concentration is maintained at 50 to 100 mg/L. Water quality monitoring point 27 is set at the outlet of the disinfection tank. When the water quality qualified water enters the clean water collecting tank 10 through the No. 7 pump 19, the water quality is unqualified, and the water is adjusted by the No. 9 pump 21 to return to the pretreatment tank 7 for water quality adjustment. Ensure that the water entering the clean water collection tank 10 meets the standards of Farmland Irrigation Water Quality Standard (GB5084-2005), namely COD _cr ≤150mg/L, BOD ₅ ≤80mg/L, TP≤8mg/L, TSS≤100mg/L, NH ₃ -N ≤ ₃₀ mg / L, pH value of 6 ~ 8, fecal coliform 10000 / L, aphid eggs 2 / L.

The qualified water source of the irrigation water is filtered by the water purification pool 10 through the eighth pump 20 into the laminating filter 11 in the drip irrigation pipe network for secondary filtration, and the secondary filtered sewage is passed through the PVC pipe to the laminated filter 11 to The drip tape 12 is irrigated; the lamination filter 11 selects 120 mesh, thereby ensuring a higher turbidity removal rate with relatively low pressure loss.

Step 4. Perform drip irrigation and chlorination:

In this step, a guarantee method for long-term operation of the drip irrigation system of the embodiment of the present invention is described;

When the drip irrigation operation is carried out, the qualified irrigation water source is discharged from the lamination filter 11 and enters the drip irrigation belt 12 for drip irrigation of the farmland; the drip irrigation belt 12 selects the irrigation device with a flow rate of 2.0 L of the drip irrigation belt; In addition to the grade filter unit, the drip irrigation belt is periodically chlorinated with the system operation.

During the chlorination process, the sodium hypochlorite solution is added to the water of the PVC pipe by the adjustable proportional pump 29 in the drip irrigation pipe network, and then the secondary filter is filtered by the lamination filter 11 and enters the drip irrigation zone 12 for chlorination. And flushing; the time of each chlorination rinse is determined according to the residual chlorine concentration, the active component of the sodium hypochlorite solution is Cl ^- , the frequency of chlorination washing is gradually increased according to the cumulative operation of the drip irrigation system; the chlorination process is realized by the parallel adjustable proportional pump 29, The chlorination time is 1 to 3 hours, the concentration is 0.8 to 2.5 mg/L, and the residual chlorine value of the irrigation system is controlled to be 2.5 mg/L. At the time of rinsing, the flow rate of the capillary end of the drip irrigation belt 12 is 0.4 to 0.6 m/s, the rinsing time is 5 to 10 minutes, and the rinsing frequency is 1 time/1 to 2 weeks.

In summary, the reuse of aquaculture wastewater by the combined treatment mode of “pretreatment-deep treatment-secondary filtration-continuous guarantee” not only realizes the recycling of aquaculture wastewater, but also effectively controls the problem of clogging of farmland reuse drip irrigation system, ensuring The system is running safely.

The operation management method of the embodiment of the present invention must meet the following conditions:

(1) Design criteria for wastewater treatment in draught irrigation systems for intensive dairy farm aquaculture wastewater:

A total of 260 adult cows are farmed in dairy farms. According to the “Emission Standards for Pollutants in Livestock and Poultry Industry” (GB18596-2001), the farm is a Class I scale of intensive livestock and poultry farms. The maximum allowable displacement of the dry manure process is 17m ³ / hundred heads per day (winter), 20m ³ / hundred heads per day (summer). Take summer as an example, the maximum allowable displacement per day of the farm is 60m ³ , that is, the daily processing capacity is 60m ³ , and the system continues to operate, so the hourly processing capacity should be 2.5m ³ /h.

(2) Confirmation of water quality of influent water:

Refer to the "Technical Specifications for Livestock and Poultry Farming Pollution Control Engineering" (HJ497-2009), and design the influent water quality as shown in Table 1 below.

Table 1 Design Influent Water Quality Index (Unit: mg/L, except pH)

Note: The influent water quality can be designed according to the measured value of the farm.

(3) Confirmation of water quality of effluent:

The effluent water quality should meet the "Irrigation Water Quality Standards for Farmland" (GB5084-2005) and the Sanitary Hygiene Standards (GB7959-2012), and the effluent is used for perennial alfalfa irrigation. The water quality of the designed effluent is shown in Table 2 below.

Table 2 Designed water quality indicators

(4) Advanced treatment of water quality:

As shown in Fig. 2, the aquaculture wastewater flows through the grid 24 into the primary sedimentation tank 1, and primary precipitation is carried out in the primary sedimentation tank 1. The precipitated and blocked larger solid particles are transported to the harmless treatment field for further processing.

The precipitated aquaculture wastewater clear solution is subjected to subsequent deep treatment, and is lifted by the first pump 13 into the hydrolysis acidification tank 2, and hydrolyzed and acidified in the hydrolysis acidification tank to create favorable conditions for subsequent treatment. The cultured wastewater subjected to hydrolysis and acidification is filtered and then upgraded by the second pump 14 to the anaerobic treatment tank 3, and the organic matter in the water is converted into inorganic matter in the anaerobic treatment tank 3 to generate biogas. At the same time, the produced biogas can be used to drive the biogas generator set to generate electricity for the farm lighting facilities and other electrical equipment. The anaerobic treated aquaculture wastewater is transported by the No. 3 pump 15 to the secondary sedimentation tank 4. In the secondary sedimentation tank 4, the precipitation of the activated sludge produced in the previous stage is mainly carried out, and the pH adjustment of the water is performed at the same time. Keep the pH of the water at 8.0. For the precipitated activated sludge, a part is returned to the anaerobic treatment tank 2 via the sludge return pump 23, and the other part is made into a mud cake.

The aquaculture wastewater is fed by the secondary sedimentation tank 4 or by the fourth pump 16 into the land treatment system 5. Here, the surface flow processing system is selected, and the slope is selected as 4%. Perennial alfalfa is planted within the processing system. The water flows through the land treatment system, and under the action of soil filtration, interception, physicochemical adsorption, chemical decomposition, biological oxidation, and biological absorption, transformation, degradation and biosynthesis, the effective nutrients in the aquaculture wastewater can be removed and these nutrients can be removed. It is concentrated in the surface layer of the soil; it can block and retain the suspended matter and chemical substances in the aquaculture wastewater that are larger than the pore size of the soil; it can absorb, replace, complex and precipitate the ions in the aquaculture wastewater to purify the water. After passing through the land treatment system 5, the culture wastewater is collected in the water collection channel 6 connected to the slope foot, and is re-precipitated in the water collection channel 6, and the water quality is adjusted again.

(5) Water source pretreatment of drip irrigation pipe network:

The inlet pressure of the sand filter 8 is set to 0.3 MPa, and the filtration flow rate is 0.05 m/s. When the pressure difference between the inlet and outlet of the sand filter reaches 0.15 MPa, backwashing is started, and the backwashing uses dissolved oxygen to 4.0. The micro/nano bubble water of mg/L has a backwashing flow rate of 0.02 m/s. When the pressure difference falls back to 0.05 MPa, the backwashing sewage is discharged to the pretreatment tank 7 for sedimentation and water quality adjustment.

The culture wastewater passes through the sand filter 8 and enters the disinfection tank 9 for micro-nano ozone aeration sterilization. The ozone concentration is maintained at 50 mg/L for 30 minutes each time. A water quality monitoring point 28 is arranged at the outlet of the disinfection tank 9. When the water quality qualified water enters the clean water collecting tank 10 through the No. 7 pump 19, if the water quality is unqualified, the water is adjusted through the No. 9 valve 21 to the pretreatment tank 7 for water quality adjustment. To ensure that the water entering the clean water collection tank 10 meets the standards of the Farmland Irrigation Water Quality Standard, namely COD _cr ≤150mg/L, BOD ₅ ≤80mg/L, TP≤8mg/L, TSS≤100mg/L, NH ₃ - N ≤ 30 mg / L, pH value of 6 ~ 8, 10,000 coliforms / L, and 2 eggs / locust eggs.

(6) Drip irrigation pipe network anti-blocking safety, operation mechanism

The working pressure of the drip irrigation belt 12 is generally set to 0.6 to 1.0 MPa. Considering the system requirements and soil conditions, the drip irrigation belt 12 can select the drip irrigation belt of the slice emitter with a flow rate of 1.2 to 2.0L. Due to the narrow internal flow passage of the emitter in the drip irrigation belt of the slice emitter, the clogging is easy to occur. Therefore, after the system is operated for a certain period of time, the drip irrigation belt 12 is chlorinated and rinsed by the adjustable proportional pump 29 to ensure the uniformity of the system irrigation. And running security. Normally, the chlorination time is 3 h, the concentration is 0.8 mg/L, and the residual chlorine value of the irrigation system is controlled to be 2.5 mg/L. After chlorination, the pipe flushing flow rate was 0.45 m/s, the flushing time was 10 min, and the flushing frequency was 1 time/2 weeks. Under the operation guarantee mechanism, the clogging material in the drip irrigation belt can be effectively removed, the clogging risk of the irrigator can be reduced, and the system can be safely operated for more than 350 hours.

Claims (10)

1. An intensive dairy farm aquaculture wastewater drip irrigation system, characterized by comprising: a grid (24), a water distribution well (25), a barn (26), a micro-nano bubble generating device (27), a water source pretreatment system, and a depth The treatment system and the drip irrigation pipe network; the water distribution well (25) is respectively connected to the water inlet of the livestock house (26) and the inlet of the micro-nano bubble generating device (27) through the pipeline, and the outlet and deep treatment of the micro-nano bubble generating device (27) The clean water inlet in the system is connected, and the sewage outlet of the livestock house (26) is connected to the inlet of the water source pretreatment system through the grille (24); the outlet of the water source pretreatment system, the inlet and outlet of the first pump (13), and the deep treatment The sewage inlet and outlet of the system, the inlet and outlet of the No. 8 pump (20) and the inlet of the drip irrigation pipe network are sequentially connected in sequence.
2. The intensive dairy farm aquaculture wastewater drip irrigation system according to claim 1, wherein the water source pretreatment system comprises: a primary sedimentation tank (1) and a sewage pump (22); a primary sedimentation tank (1) The entrance and exit of the water quality pretreatment system are respectively the inlet and outlet of the water quality pretreatment system. The first stage sedimentation tank (1) is connected with a sewage pump (22) leading to the sewage system, and the larger coarse particles precipitated are discharged to the first stage sediment through the sewage pump (22). Pool (1).
3. The intensive dairy farm aquaculture wastewater drip irrigation system according to claim 1, wherein the deep treatment system comprises: a hydrolysis acidification tank (2), an anaerobic treatment tank (3), and a secondary sedimentation tank (4) ), land treatment system (5), water collection channel (6), pretreatment tank (7), sand filter (8), disinfection tank (9), clean water collection tank (10), No. 2 pump (14 ), No. 3 pump (15), No. 4 pump (16), No. 5 pump (17), No. 6 pump (18), No. 7 pump (19), No. 8 pump (20), No. 9 pump (21) , sludge return pump (23) and micro-nano bubble generating device (27); the inlet of the hydrolysis acidification tank (2) is the sewage inlet of the deep treatment system, the hydrolysis acidification tank (2) passes the No. 2 pump (14) and anaerobic The treatment tank (3) is connected, the anaerobic treatment tank (3) is connected to the secondary sedimentation tank (4) through the third pump (15), and the secondary sedimentation tank (4) is passed through the fourth pump (16) and the land treatment system ( 5) Connected, the water collection channel (6) is connected to the slope of the land treatment system (5), and the water collection channel (6) is connected to the pretreatment tank (7) through the fifth pump (17), and is connected to the pretreatment tank (7). ) connected to the sewage inlet of the sand filter (8) through the sixth pump (18), the clean water of the sand filter (8) For the clean water inlet of the deep treatment system, the outlet of the sand filter (8), the disinfection tank (9), the seventh pump (19) and the clean water collection tank (10) are connected in series through the pipeline, in the disinfection tank (9) There is also a water quality monitoring point (28) on the pipeline between the water purification pool (10), and the disinfection tank (9) is connected to the pretreatment tank (7) through the No. 9 pump (21); the water purification pool (10) The clean water outlet is the outlet of the deep treatment system; the secondary sedimentation tank (4) is also connected with a sludge return pump (23) for pumping the sludge to the anaerobic treatment tank (3).
4. The intensive dairy farm aquaculture wastewater drip irrigation system according to claim 3, wherein the anaerobic treatment tank (3) is sequentially connected with the driving biogas generating unit and the farm lighting facility to provide farm lighting facilities. And the power required by other electrical equipment.
5. The intensive dairy farm aquaculture wastewater drip irrigation system according to claim 1, wherein the drip irrigation pipe network comprises: an adjustable proportional pump (29), a laminated filter (11) and a drip irrigation belt (12) The inlet of the drip irrigation system is sequentially connected to the drip irrigation belt (12) through a PVC pipe and a lamination filter (11); an adjustable proportional pump is connected in parallel with the PVC pipe between the inlet of the drip irrigation system and the laminated filter (11) (29) ).
6. An intensive dairy farm aquaculture wastewater drip irrigation system according to claim 1, wherein the specific steps are as follows:

   Step 1. Pretreating the water source for the aquaculture wastewater;

   Step 2: performing deep treatment on the pretreated wastewater;

   Step 3. Perform secondary filtration on the deep treatment and the primary filtered water source to ensure that the water quality of the drip irrigation operation is qualified;

   Step 4. Perform drip irrigation and chlorination.
7. The method for managing intensive dairy farm aquaculture wastewater according to claim 6, characterized in that the water source pretreatment process of the step 1 is: after the culture wastewater enters the primary sedimentation tank (1), the acid and alkali can be carried out therein. Neutralization and primary precipitation, the larger coarse particles precipitated are discharged to the primary sedimentation tank (1) through the sewage pump (21), and transported to the harmless treatment field together with the dirt intercepted by the grid (24). Further treatment; and the primary sedimentation tank (1) has the function of water volume regulation and storage.
8. The method for managing intensive dairy farm aquaculture wastewater according to claim 6, characterized in that the deep treatment process of the step 2: the aquaculture wastewater in the primary sedimentation tank (1) is passed through a No. 1 pump ( 13) After upgrading, enter the hydrolysis acidification tank (2), and carry out hydrolysis and acidification in the hydrolysis acidification tank (2). The organic matter of macromolecules is degraded into small molecular organic substances by the action of hydrolyzed acidifying bacteria, and the insoluble organic matter is converted into soluble organic matter, which creates favorable conditions for subsequent treatment; the aquaculture wastewater treated by hydrolysis and acidification is filtered and then pumped by No. 2 (14) Raising to the anaerobic treatment tank (3), in the anaerobic treatment tank (3) through the metabolism of hydrogen producing acetogen and methane bacteria, the organic matter in the water is converted into inorganic matter, producing biogas; after complete anaerobic treatment After the filtered wastewater is filtered, it is sent to the secondary sedimentation tank (4) by the No. 3 pump (15). In the secondary sedimentation tank (4), the precipitation of the activated sludge produced in the previous stage is mainly carried out, and the pH of the water is simultaneously performed. Adjustment; for the precipitated activated sludge, part of the sludge is returned to the anaerobic treatment tank (2) through the sludge return pump (23), and the other part is made into the mud cake; the aquaculture wastewater is self-flowed by the secondary sedimentation tank (4) or The pump (16) enters the land treatment system (5); the aquaculture wastewater is collected in the water collection channel (6) connected to the slope by the land treatment system (5).
9. The method for managing and managing the intensive dairy farm aquaculture wastewater according to claim 6, wherein the step 3 is combined with the first-stage filtration of the deep-treated water source, and then the second-stage filtration and the third-stage filtration. Filtration process: the wastewater is re-precipitated in the water collection channel (6), and the water quality is adjusted again; after the sedimentation and water quality adjustment in the water collection channel (6), the aquaculture wastewater enters the pre-treatment through the fifth pump (17). The pool (7), the aquaculture wastewater is stored in the pretreatment tank (7), and is filtered by the sand filter (8) under the lifting of the No. 6 pump (18). During the primary filtration process, Backwashing is carried out when the water flow pressure difference in the sand filter (8) reaches 0.15 to 0.20 MPa, and the backwash water source uses the ozone source jointly generated by the micro/nano bubble generator (27), and uses the backwashing speed and duration according to the pressure difference. The degree of recovery is determined, the backwashing sewage is discharged to the water collecting channel (6), and the sedimentation and water quality adjustment are performed again; the sewage enters the disinfection tank (9) after being filtered by the sand filter (8), and in the disinfection tank (9) Micro-nano bubbles for aquaculture wastewater The generator (27) is combined with the ozone source for micro-nano ozone aeration sterilization, and a water quality monitoring point (27) is set at the outlet of the disinfection tank. When the water quality qualified water enters the clean water collection tank (10) through the seventh pump (19) If the water quality is unqualified, it will be returned to the pretreatment tank (7) through the No. 9 pump (21) for water quality adjustment. The adjusted sewage will enter the laminated filter from the clean water collection tank (10) through the No. 8 pump (20). 11) Perform secondary filtration.
10. The method for managing intensive dairy farm aquaculture wastewater according to claim 6, wherein during the drip irrigation operation in the step 4, the qualified irrigation water source after the treatment enters the drip irrigation belt (12) for drip irrigation. During the chlorination process of step 4, the sodium hypochlorite solution is added to the water of the PVC pipe by the adjustable proportional pump (29) in the drip irrigation pipe network, and then the laminated filter (11) is used. The second filtration and entering the drip irrigation belt (12) for chlorination and rinsing; the time of each chlorination rinsing is determined according to the residual chlorine concentration, and the flow rate of the drip irrigation belt (12) at the end of the rinsing is 0.4-0.6 m/s, and the sodium hypochlorite solution is effective. The composition is Cl-, and the frequency of chlorination is gradually increased according to the cumulative operation of the drip irrigation system.

Images