Integrated breeding wastewater treatment method and device

Abstract

The wastewater treatment method comprises the following steps: (1) opening a water inlet electromagnetic valve and a water drainage electromagnetic valve, closing an air inlet electromagnetic valve and a pressure relief electromagnetic valve, filling a filler area with biomass filler through a filler hole, enabling to-be-treated breeding wastewater to flow into a tank body through a water inlet pipeline, and discharging the to-be-treated breeding wastewater after the to-be-treated breeding wastewater flows through the filler area; discharging through a drainage pipeline; and (2) closing the water inlet solenoid valve and the water outlet solenoid valve, starting the material stirrer, fully and uniformly mixing the materials in the filling area, performing composting fermentation on the materials in the filling area, opening the discharge port and the material stirrer after the fermentation is completed, and discharging the composted and decomposed materials. According to the integrated breeding wastewater treatment method and equipment, wastewater treatment, liquid fertilizer collection and fermentation composting are integrated, the integrated breeding wastewater treatment method and equipment are applied to small and medium-sized farms, wastewater can be efficiently and rapidly treated at low cost, decomposed materials are produced and returned to the field or serve as raw materials for producing organic fertilizers, and meanwhile resource utilization of biomass ash is achieved.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, and in particular to an integrated aquaculture wastewater treatment method and device. Background Art

[0002] Aquaculture wastewater refers to feces, urine and flushing sewage produced in aquaculture manure. Aquaculture wastewater has the characteristics of poor biodegradability (high COD and low BOD) and high suspended solids SS, and is a type of wastewater that is difficult to treat. The existing treatment method is to use oxidation ponds, MBBR, MBR and other biological methods for treatment and then reuse in farmland, but the above methods still have the following problems: First, the pollutant concentration (COD, BOD, SS) of the treated effluent is still high. The untreated biogas slurry contains a large amount of suspended solids and colloids. Direct return to the field will form a layer of diaphragm on the soil surface to produce crusting, causing secondary pollution, which is easy to affect the soil bulk density, cause soil salinization, and hardening. Second, the use of oxidation ponds, MBBR, MBR and other biological methods has poor filler treatment efficiency. During the operation, sludge expansion and shedding, more foam, and unstable effluent water quality are prone to occur. The treatment process is complicated, the disposal device occupies a large area, the reaction time is long, and the cost is high; Third, the existing aerobic composting reactor has a low degree of automation, poor efficiency, poor fluidity and uniformity of the pile, which is easy to cause local anaerobic and incomplete fermentation of the pile, and multi-stage facilities and equipment will increase the construction, operation and management costs. Therefore, it is urgent to study an integrated aquaculture wastewater treatment method and device with higher pollutant degradation efficiency, more stable system, and simpler and more efficient treatment in production.

[0003] Biomass ash is the ash produced by burning biomass fuels such as straw and wood in biomass power plants. It is the main waste generated in the power generation process of biomass power plants. At present, the treatment method of biomass ash is to directly discard it or use it for paving and brick making. The utilization rate is low and the economic added value is not high. It may also need to bear certain disposal costs, which increases the operating cost of the power plant and reduces the economic benefits. Studies have reported that biomass ash is modified to prepare fillers for wastewater treatment, but the modification effect is not good and the wastewater treatment efficiency is low. It is necessary to study more efficient resource treatment methods for biomass ash. Summary of the invention

[0004] The object of the present invention is to provide an integrated aquaculture wastewater treatment device, comprising a tank body (1), the top of the tank body (1) being fixedly connected with a water inlet pipeline (2) and an exhaust pipeline (9), the water inlet pipeline (2) being fixedly installed with a water inlet solenoid valve (3), and the exhaust pipeline (9) being fixedly installed with a pressure relief solenoid valve (10), a dust removal net (11) and a gas monitor (12);

[0005] The bottom of the tank body (1) is provided with a discharge port (14), the bottom of the tank body (1) is fixedly connected with a drainage pipeline (4) and an air intake pipeline (6), the drainage pipeline (4) is fixedly installed with a drainage solenoid valve (5), the air intake pipeline (6) is fixedly installed with a drainage solenoid valve (7), and the air intake pipeline (6) is externally connected to a blower (8);

[0006] A water distributor (102) is fixedly installed on the top of the tank body (1), a filter material partition (104) is installed on the bottom of the tank body (1), a material mixer (103) is installed at the center of the filter material partition (104), and the upper layer of the filter material partition (104) is a filling area (105), and the filling area (105) is filled with biomass filler.

[0007] In a preferred technical solution of the present invention, the pore size of the filter material partition (104) is 3-5 mm.

[0008] In a preferred technical solution of the present invention, the particle size of the biomass filler is 4-8 mm.

[0009] In a preferred technical solution of the present invention, the top of the tank body (1) is connected to a multifunctional parameter monitor (106) via a wire.

[0010] In a preferred technical solution of the present invention, a feed / inspection hole (107) is provided on the top of the tank body (1).

[0011] In a preferred technical solution of the present invention, a touch integrated machine (13) is installed on one side of the tank body (1), and the touch integrated machine is connected to the water inlet solenoid valve (3), the pressure relief solenoid valve (10), the gas monitor (12), the material mixer (103), the multi-function parameter monitor (106), the drainage solenoid valve (5), the drainage solenoid valve (7) and the blower (8) through wires, and the start and stop of the solenoid valve and the blower and the display of the monitor indicators can be realized through the touch integrated machine.

[0012] Another object of the present invention is to provide an integrated aquaculture wastewater treatment method, using the integrated aquaculture wastewater treatment device of the present invention, specifically comprising the following steps:

[0013] (1) opening the water inlet solenoid valve (3) and the drainage solenoid valve (5), closing the air inlet solenoid valve (7) and the pressure relief solenoid valve (10), filling the biomass filler into the filler area (105) through the filler hole (107), allowing the aquaculture wastewater to be treated to flow into the tank body (1) through the water inlet pipe (2), and after flowing through the filler area (105), it is discharged through the drainage pipe (4) to obtain treated effluent;

[0014] (2) The water inlet solenoid valve (3) and the water discharge solenoid valve (5) are closed, and the material mixer (103) is turned on. After the materials in the filling area (105) are fully mixed, the moisture content of the materials is adjusted to 60-65%, and the materials in the filling area (105) are composted and fermented. After the fermentation is completed, the discharge port (14) and the material mixer (103) are opened to discharge the decomposed materials to obtain a compost product.

[0015] In the preferred technical scheme of the present invention, the aquaculture wastewater to be treated is: collecting cow dung, cow urine and flushing water produced in a cattle ranch, and obtaining wastewater and waste residue after solid-liquid separation; after the wastewater is treated by hydrolysis, acidification and anaerobic fermentation, it becomes the aquaculture wastewater to be treated.

[0016] In the preferred technical scheme of the present invention, the aquaculture wastewater to be treated has COD 5000-20000 mg / L, BOD 2000-6000 mg / L, total suspended solids SS 7000-15000 mg / L, ammonia nitrogen 400-800 mg / L, total phosphorus 100-500 mg / L, and pH 6-9.

[0017] In a preferred technical solution of the present invention, in the step (1), the volume ratio of the biomass filler to the aquaculture wastewater to be treated is 1:20-40, preferably 1:25-35.

[0018] In the preferred technical solution of the present invention, in the step (1), the flow rate of the wastewater flowing through the packing area (105) is 1-10m 3 / h, preferably 3-5m 3 / h.

[0019] In a preferred technical solution of the present invention, in the step (2), the material in the filler area (105) includes biomass fillers and residues after wastewater is intercepted by the biomass fillers.

[0020] In the preferred technical solution of the present invention, in the step (1), the treated effluent meets the pollutant emission standards for livestock and poultry farming (GB 18596-2001).

[0021] In the preferred technical solution of the present invention, in the step (1), the treated effluent has a COD of less than 400 mg / L, a BOD of less than 150 mg / L, a total suspended solids SS of less than 200 mg / L, ammonia nitrogen of less than 80 mg / L, and a total phosphorus of less than 8 mg / L.

[0022] In the preferred technical solution of the present invention, in the step (2), the fermentation is completed when the moisture content of the material drops below 45%, the temperature drops to room temperature, the material has no odor, and the color changes from light color to brown, dark brown or black.

[0023] In the preferred technical solution of the present invention, in the step (2), when the pressure in the tank increases, or the temperature or humidity is too high, the temperature can be lowered and stirred by turning on the blower (8), the air intake solenoid valve (7), the pressure relief solenoid valve (10) and the material mixer (103).

[0024] In the preferred technical solution of the present invention, in the step (2), the oxygen concentration in the exhaust gas is monitored by a gas monitor (12) to control the ventilation oxygen supply and the oxygen absorption rate, and the appropriate volume concentration value of oxygen in the exhaust gas is 14-17%.

[0025] In the preferred technical solution of the present invention, in the step (2), the gas is filtered through a dust removal net (11) and then discharged from an exhaust pipe (9).

[0026] In the preferred technical solution of the present invention, in the step (2), the compost product meets the technical specifications for composting livestock and poultry manure (NY / T 3442-2019).

[0027] In a preferred technical solution of the present invention, in step (2), the compost product has an organic matter content greater than 30 g / L, a moisture content less than 45%, and a seed germination index (GI) greater than 70%.

[0028] In a preferred technical solution of the present invention, in step (1), the biomass filler is a modified biomass filler, and its preparation method comprises the following steps:

[0029] (1) adding biomass ash into a ball mill, gradually spraying an acetic acid solution with a concentration of 20-30% during the ball milling process, wherein the mass ratio of the acetic acid solution to the biomass ash is 1:30-50, granulating into spherical particles of 5-8 mm, drying, heating from room temperature to 400-500° C. at a rate of 10-15° C. / min, and calcining at 400-500° C. for 1-2 h to obtain biomass ash particles;

[0030] (2) washing the biomass ash particles obtained in step (1) with water, soaking for 24-48 hours and then drying, heating the temperature from room temperature to 800-900° C. at a rate of 10-15° C. / min under nitrogen protection, and calcining at 800-900° C. for 4-6 hours;

[0031] (3) Immerse the biomass ash particles after burning in step (2) in 20% HNO 3 and 20% H 2 SO 4 The mixed solution was ultrasonically treated for 30-60 minutes, stirred, heated, refluxed and oxidized in a water bath at 70-80°C for 3-4 hours, cooled, and repeatedly rinsed with ultrapure water until the pH was neutral, and dried to constant weight;

[0032] (4) The biomass ash particles dried in step (3) are placed in a Fe 2 (NO) 3 The solution is shaken at 100-150 rpm for 12-24 hours, then allowed to stand for 24 hours, the temperature is raised from room temperature to 400-500°C at a heating rate of 10-15°C / min, and calcined at 400-500°C for 3-4 hours to obtain the product.

[0033] In the preferred technical solution of the present invention, in step (1), the ball milling condition is a ball mill drum speed of 30-50 r / min.

[0034] In the preferred technical solution of the present invention, in step (1), the drying condition is drying at 100-105°C.

[0035] In the preferred technical solution of the present invention, in step (3), the 20% HNO 3 and 20% H 2 SO 4 The volume ratio is (1-2):1.

[0036] In the preferred technical solution of the present invention, in step (3), the ultrasonic condition is 20-40kHZ, and the ultrasonic treatment is 30-60min.

[0037] In the preferred technical solution of the present invention, in step (3), the drying condition is drying at 100-105°C.

[0038] The object of the present invention is to provide a modified biomass filler, the preparation method of which comprises the following steps:

[0039] (1) adding biomass ash into a ball mill, gradually spraying an acetic acid solution with a concentration of 20-30% during the ball milling process, wherein the mass ratio of the acetic acid solution to the biomass ash is 1:30-50, granulating into spherical particles of 5-8 mm, drying, heating from room temperature to 400-500° C. at a rate of 10-15° C. / min, and calcining at 400-500° C. for 1-2 h to obtain biomass ash particles;

[0040] (2) washing the biomass ash particles obtained in step (1) with water, soaking for 24-48 hours and then drying, heating the temperature from room temperature to 800-900° C. at a rate of 10-15° C. / min under nitrogen protection, and calcining at 800-900° C. for 4-6 hours;

[0041] (3) The biomass ash particles after burning in step (2) are immersed in 20% HNO 3 and 20% H 2 SO 4The mixed solution was ultrasonically treated for 30-60 minutes, stirred, heated, refluxed and oxidized in a water bath at 70-80°C for 3-4 hours, cooled, and repeatedly rinsed with ultrapure water until the pH was neutral, and dried to constant weight;

[0042] (4) The biomass ash particles dried in step (3) are placed in a Fe 2 (NO) 3 The solution is shaken at 100-150 rpm for 12-24 hours, then allowed to stand for 24 hours, the temperature is raised from room temperature to 400-500°C at a heating rate of 10-15°C / min, and calcined at 400-500°C for 3-4 hours to obtain the product.

[0043] In the preferred technical solution of the present invention, in step (1), the ball milling condition is a ball mill drum speed of 30-50 r / min.

[0044] In the preferred technical solution of the present invention, in step (1), the drying condition is drying at 100-105°C.

[0045] In the preferred technical solution of the present invention, in step (3), the 20% HNO 3 and 20% H 2 SO 4 The volume ratio is (1-2):1.

[0046] In the preferred technical solution of the present invention, in step (3), the ultrasonic condition is 20-40kHZ, and the ultrasonic treatment is 30-60min.

[0047] In the preferred technical solution of the present invention, in step (3), the drying condition is drying at 100-105°C.

[0048] Another object of the present invention is to provide application of the modified biomass filler of the present invention in water treatment.

[0049] Unless otherwise specified, when the present invention relates to the percentage between liquids, the percentage is volume / volume percentage; when the present invention relates to the percentage between liquids and solids, the percentage is volume / weight percentage; when the present invention relates to the percentage between solids and liquids, the percentage is weight / volume percentage; the rest are weight / weight percentages.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The present invention utilizes biomass ash to prepare modified biomass filler, which can effectively adsorb and intercept pollutants, further reduce pollutants such as SS, COD, nitrogen and phosphorus in wastewater, and improve wastewater treatment efficiency.

[0052] 2. The present invention provides an integrated aquaculture wastewater treatment process and treatment equipment, which integrates wastewater treatment, liquid fertilizer collection and fermentation composting, and is applied to small and medium-sized farms. It can treat wastewater at low cost, efficiently and quickly, and produce decomposed materials to return to the field or as raw materials for producing organic fertilizers. At the same time, it realizes the resource utilization of biomass ash, solves the problem of wastewater treatment in small and medium-sized farms, and realizes waste treatment and resource utilization of biomass ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a structural schematic diagram of the integrated wastewater treatment equipment of the present invention;

[0054] Figure 2 It is a cross-sectional view of the tank structure of the integrated wastewater treatment equipment of the present invention. DETAILED DESCRIPTION

[0055] The present invention is further described below with reference to the embodiments.

[0056] The aquaculture wastewater to be treated is: cow dung, cow urine and flushing water produced in the cattle ranch are collected, and after solid-liquid separation, wastewater and waste residue are obtained; after the wastewater is treated by hydrolysis, acidification and anaerobic fermentation, it is the aquaculture wastewater to be treated, among which COD6620mg / L, BOD 2590mg / L, total suspended solids SS 9700mg / L, ammonia nitrogen 592mg / L, total phosphorus 317mg / L, and pH value is 7.8.

[0057] Biomass ash: the residue after 1000g of biomass waste (including straw, fruits and vegetables, etc.) was incinerated at 900℃ for 30min. The physical and chemical properties are shown in Table 1.

[0058] Table 1 Physical and chemical properties of biomass ash

[0059]

[0060] Example 1 Preparation of modified biomass filler of the present invention

[0061] (1) Adding biomass ash to a ball mill, gradually spraying a 20% acetic acid solution during the ball milling process, wherein the mass ratio of the acetic acid solution to the biomass ash is 1:30, granulating into 5-8 mm spherical particles, drying, heating from room temperature to 500° C. at a rate of 10-15° C. / min, and calcining at 500° C. for 1-2 h to obtain biomass ash particles; the ball mill is a commercially available WM2000 horizontal ball mill, the ball mill drum speed is 35 r / min, the motor power is 18.5 kW, and the processing capacity is 700 L / h.

[0062] (2) The biomass ash particles obtained in step (1) were washed with water, soaked for 24 hours, dried in a 105°C forced air drying oven, and placed in a tubular furnace at N 2 The samples were fired at 900°C for 4 h at a temperature increase rate of 10°C / min under atmosphere protection.

[0063] (3) Immerse the biomass ash particles after burning in step (2) in 20% HNO 3 and 20% H 2 SO 4 Mixed solution (HNO 3 Solution and H 2 SO 4 The volume ratio of the solution was 2:1), ultrasonic treatment was carried out at 20 kHz for 30 min, stirring, heating, reflux and oxidation were carried out in a water bath at 80°C for 3 h, and after cooling, the solution was repeatedly rinsed with ultrapure water until the pH was neutral, and dried in a forced air drying oven at 105°C for 24 h to constant weight;

[0064] (4) The biomass ash particles dried in step (3) were placed in a Fe 2 (NO) 3 The solution was shaken at 150 rpm for 24 hours, then allowed to stand for 24 hours, the temperature was raised from room temperature to 500°C at a rate of 10°C / min, and calcined at 500°C for 3 hours to obtain a modified biomass filler.

[0065] Example 2 Preparation of modified biomass filler of the present invention

[0066] (1) Adding biomass ash to a ball mill, gradually spraying a 20% acetic acid solution during the ball milling process, wherein the mass ratio of the acetic acid solution to the biomass ash is 1:30, granulating into 5-8 mm spherical particles, drying, heating from room temperature to 500° C. at a rate of 10-15° C. / min, and calcining at 500° C. for 1-2 h to obtain biomass ash particles; the ball mill is a commercially available WM2000 horizontal ball mill, the ball mill drum speed is 35 r / min, the motor power is 18.5 kW, and the processing capacity is 700 L / h.

[0067] (2) The biomass ash particles obtained in step (1) were washed with water, soaked for 24 hours, dried in a 105°C forced air drying oven, and placed in a tubular furnace at N 2 The samples were fired at 900°C for 4 h at a temperature increase rate of 10°C / min under atmosphere protection.

[0068] (3) Immerse the biomass ash particles after burning in step (2) in 20% HNO 3 and 20% H 2 SO 4 Mixed solution (HNO 3 Solution and H2 SO 4 The volume ratio of the solution was 2:1), ultrasonic treatment was carried out at 20 kHz for 30 min, stirring, heating, reflux and oxidation were carried out in a water bath at 80°C for 3 h, and after cooling, the solution was repeatedly rinsed with ultrapure water until the pH was neutral, and dried in a forced air drying oven at 105°C for 24 h to constant weight;

[0069] (4) The biomass ash particles dried in step (3) were placed in a Fe 2 (NO) 3 The solution was shaken at 150 rpm for 24 hours, then allowed to stand for 24 hours, the temperature was raised from room temperature to 500°C at a rate of 10°C / min, and calcined at 500°C for 3 hours to obtain a modified biomass filler.

[0070] Example 3 Preparation of modified biomass filler of the present invention

[0071] (1) Adding biomass ash to a ball mill, gradually spraying a 20% acetic acid solution during the ball milling process, wherein the mass ratio of the acetic acid solution to the biomass ash is 1:30, granulating into 5-8 mm spherical particles, drying, heating from room temperature to 500° C. at a rate of 10-15° C. / min, and calcining at 500° C. for 1-2 h to obtain biomass ash particles; the ball mill is a commercially available WM2000 horizontal ball mill, the ball mill drum speed is 35 r / min, the motor power is 18.5 kW, and the processing capacity is 700 L / h.

[0072] (2) The biomass ash particles obtained in step (1) were washed with water, soaked for 24 hours, dried in a 105°C forced air drying oven, and placed in a tubular furnace at N 2 The samples were fired at 900°C for 4 h at a temperature increase rate of 10°C / min under atmosphere protection.

[0073] (3) Immerse the biomass ash particles after burning in step (2) in 20% HNO 3 and 20% H 2 SO 4 Mixed solution (HNO 3 Solution and H 2 SO 4 The volume ratio of the solution was 2:1), ultrasonic treatment was carried out at 20 kHz for 30 min, stirring, heating, reflux and oxidation were carried out in a water bath at 80°C for 3 h, and after cooling, the solution was repeatedly rinsed with ultrapure water until the pH was neutral, and dried in a forced air drying oven at 105°C for 24 h to constant weight;

[0074] (4) The biomass ash particles dried in step (3) were placed in a Fe 2 (NO) 3The solution was shaken at 150 rpm for 24 hours, then allowed to stand for 24 hours, and the temperature was raised from room temperature to 500°C at a rate of 10°C / min, and then calcined at 500°C for 3 hours to obtain a modified biomass filler.

[0075] Biomass ash is added into a ball mill, and an acetic acid solution with a concentration of 20% is gradually sprayed into the ball mill during the ball milling process, wherein the mass ratio of the acetic acid solution to the biomass ash is 1:30, and granulation is performed to form spherical particles of 5-8 mm, which are then dried, and the temperature is increased from room temperature to 500° C. at a temperature increase program of 10-15° C. / min, and the biomass ash particles are calcined at 500° C. for 1-2 hours to obtain biomass ash particles. The ball mill is a commercially available WM2000 horizontal ball mill, and the ball mill has a grinding drum speed of 35 r / min, a motor power of 18.5 kW, and a processing capacity of 700 L / h.

[0076] Example 4 Integrated aquaculture wastewater treatment reactor of the present invention

[0077] The integrated aquaculture wastewater treatment reactor of the present invention is shown in Figure 1-2 , comprising a tank body (1);

[0078] The top of the tank body (1) is fixedly connected with a water inlet pipeline (2) and an exhaust pipeline (9); the water inlet pipeline (2) is fixedly installed with a water inlet solenoid valve (3); and the exhaust pipeline (9) is fixedly installed with a pressure relief solenoid valve (10), a dust removal net (11) and a gas monitor (12);

[0079] A water distributor (102) is fixedly installed on the top of the tank body (1), a filter material partition (104) is installed on the bottom of the tank body (1), and a material mixer (103) is installed at the center of the filter material partition (104).

[0080] The top of the tank body (1) is connected to a multifunctional parameter monitor (106) via a wire;

[0081] The bottom of the tank body (1) is fixedly connected with a drainage pipeline (4) and an air intake pipeline (6); the drainage pipeline (4) is fixedly installed with a drainage solenoid valve (5); the air intake pipeline (6) is fixedly installed with a drainage solenoid valve (7); and the air intake pipeline (6) is externally connected with a blower (8);

[0082] The top of the tank body (1) is provided with a feed / inspection hole (107), and the bottom of the tank body (1) is provided with a discharge port (14);

[0083] A touch integrated machine (13) is installed on one side of the tank body (1), and the touch integrated machine is connected to the water inlet solenoid valve (3), the pressure relief solenoid valve (10), the gas monitor (12), the material mixer (103), the multifunctional parameter monitor (106), the drainage solenoid valve (5), the drainage solenoid valve (7) and the blower (8) through wires. The solenoid valve and the blower can be started and stopped, and the indicators of the monitor can be displayed through the touch integrated machine.

[0084] The tank body (1) contains biomass filler, which is filled into the tank body (105) through the filler hole (107), and a filter material partition (104) with a hole diameter of 3 mm is installed at the bottom of the tank body. The upper layer of the filter material partition (104) is the filler area (105).

[0085] Example 5 Integrated aquaculture wastewater treatment process of the present invention

[0086] The modified biomass filler of Example 1 was loaded into the reactor of Example 4. The total volume of the reactor was 10 m 3 , the packing volume is 5m 3 .

[0087] Open the water inlet solenoid valve (3) and the drain solenoid valve (5), close the air inlet solenoid valve (7) and the pressure relief solenoid valve (10), and transfer 175m 3 The aquaculture wastewater to be treated flows into the tank through the water inlet pipe (2) at a rate of 3m 3 / h flow rate through the packing area (105), adsorbing and intercepting suspended solids and colloids, and the treated water is discharged through the drainage pipe (4). After all the treated wastewater flows through the packing area, the effluent quality of the drainage pipe (4) is tested, as shown in Table 2, and meets the pollutant emission standard for livestock and poultry breeding industry (GB 18596-2001), and can be directly returned to the field for use.

[0088] Table 2 Results of effluent quality test

[0089]

[0090] Note: — indicates not detected.

[0091] The water inlet solenoid valve (3) and the water discharge solenoid valve (5) are closed, and the material mixer (103) is turned on to fully mix the materials in the packing area at a stirring speed of 50 rpm. Then, the air inlet solenoid valve (7), the pressure relief solenoid valve (10) and the blower (8) are turned on to adjust the moisture content of the compost material to 60-65%, and the air inlet solenoid valve (7) and the pressure relief solenoid valve (10) are closed to carry out composting fermentation.

[0092] During the composting process, the temperature is controlled at 50-60°C. The temperature can be lowered and stirred by turning on the blower (8), the air intake solenoid valve (7), the pressure relief solenoid valve (10) and the material mixer (103). The gas is filtered through a dust removal net and then discharged. The oxygen supply and oxygen absorption rate of the ventilation are controlled by monitoring the oxygen concentration in the exhaust gas through a gas monitor (12). The suitable volume concentration value of oxygen in the exhaust gas is 14-17%. When the moisture content of the composting material drops below 45% and the temperature drops to room temperature, the discharge port (14) is opened to obtain a compost product. The technical indicators are shown in Table 3. The compost product has no odor and meets the technical specifications for composting livestock and poultry manure (NY / T 3442-2019), and can be directly returned to the field for use.

[0093] Table 3 Composting product technical indicators

[0094]

[0095]

[0096] Note: — indicates not detected.

[0097] Example 6

[0098] The biomass ash particles of Comparative Example 1 were loaded into the reactor of Example 4. The packing volume was 5 m 3 .

[0099] Open the water inlet solenoid valve (3) and the drain solenoid valve (5), close the air inlet solenoid valve (7) and the pressure relief solenoid valve (10), and transfer 175m 3 The aquaculture wastewater to be treated flows into the tank through the water inlet pipe (2) at a rate of 3m 3 / h flows through the packing area (105), adsorbs and intercepts suspended solids and colloids, and the treated water is discharged through the drainage pipe (4). After all the wastewater to be treated flows through the packing area, the effluent quality of the drainage pipe (4) is tested, which contains COD 3687.34mg / L, total suspended solids SS271.60mg / L, BOD 1898.47mg / L, ammonia nitrogen 165.76mg / L, and total phosphorus 27.55mg / L. The discharge standard of the "Pollutant Emission Standard for Livestock and Poultry Breeding Industry" (GB18596-2001) is not met.

[0100] surface

[0101]

[0102]

[0103] The above description of the specific embodiments of the present invention does not limit the present invention. Those skilled in the art may make various changes or modifications based on the present invention. As long as they do not depart from the spirit of the present invention, they should all fall within the scope of protection of the claims of the present invention.

Claims

1. An integrated aquaculture wastewater treatment device, comprising a tank body (1), the top of which is fixedly connected with a water inlet pipeline (2) and an exhaust pipeline (9), the water inlet pipeline (2) is fixedly installed with a water inlet solenoid valve (3), and the exhaust pipeline (9) is fixedly installed with a pressure relief solenoid valve (10), a dust removal net (11) and a gas monitor (12); The bottom of the tank body (1) is provided with a discharge port (14), the bottom of the tank body (1) is fixedly connected with a drainage pipeline (4) and an air intake pipeline (6), the drainage pipeline (4) is fixedly installed with a drainage solenoid valve (5), the air intake pipeline (6) is fixedly installed with a drainage solenoid valve (7), and the air intake pipeline (6) is externally connected to a blower (8); A water distributor (102) is fixedly installed on the top of the tank body (1). A filter material partition (104) is installed at the inner bottom, a material mixer (103) is installed at the center of the filter material partition (104), and the upper layer of the filter material partition (104) is a filler area (105), and the filler area (105) is filled with biomass filler.

2. In the device as described in claim 1, a touch all-in-one machine (13) is installed on one side of the tank body (1), and the touch all-in-one machine is connected to the water inlet solenoid valve (3), the pressure relief solenoid valve (10), the gas monitor (12), the material mixer (103), the multi-function parameter monitor (106), the drain solenoid valve (5), the drain solenoid valve (7) and the blower (8) through wires, and the start and stop of the solenoid valve and the blower and the display of the monitor indicators can be realized through the touch all-in-one machine.

3. An integrated aquaculture wastewater treatment method, using the integrated aquaculture wastewater treatment device as described in any one of claims 1-2, specifically comprising the following steps: (1) Open the water inlet solenoid valve (3) and the drainage solenoid valve (5), close the air inlet solenoid valve (7) and the pressure relief solenoid valve (10), fill the biomass filler into the filler area (105) through the filler hole (107), and let the aquaculture wastewater to be treated flow into the tank body (1) through the water inlet pipe (2). After passing through the packing area (105), the water is discharged through the drainage pipe (4) to obtain treated effluent; (2) Close the water inlet solenoid valve (3) and the drain solenoid valve (5), start the material mixer (103), fully mix the materials in the packing area (105), adjust the moisture content of the materials to 60-65%, and compost the materials in the packing area (105). After the fermentation is completed, The material discharge port (14) and the material mixer (103) are opened to discharge the decomposed materials to obtain a compost product.

4. The method according to claim 3, wherein the aquaculture wastewater to be treated is: collecting cow dung, cow urine and flushing water produced in a cattle ranch, and obtaining wastewater and waste residue after solid-liquid separation; the wastewater is subjected to hydrolysis, acidification and anaerobic fermentation treatment to obtain the aquaculture wastewater to be treated.

5. The method according to any one of claims 3 to 4, wherein the aquaculture wastewater to be treated has a COD of 5000-20000 mg / L, a BOD of 2000-6000 mg / L, a total suspended solids SS of 7000-15000 mg / L, ammonia nitrogen of 400-800 mg / L, a total phosphorus of 100-500 mg / L, and a pH of 6-9.

6. The method according to any one of claims 3 to 5, wherein in step (1), the treated effluent has a COD of less than 400 mg / L, a BOD of less than 150 mg / L, a total suspended solids (SS) of less than 200 mg / L, ammonia nitrogen of less than 80 mg / L, and a total phosphorus of less than 8 mg / L.

7. The method according to any one of claims 3 to 6, wherein in step (2), the compost product has an organic matter content greater than 30 g / L, a moisture content less than 45%, and a seed germination index (GI) greater than 70%.

8. The method according to any one of claims 3 to 6, wherein the biomass filler is a modified biomass filler.

9. A modified biomass filler, the preparation method of which comprises the following steps: (1) adding biomass ash into a ball mill, gradually spraying an acetic acid solution with a concentration of 20-30% during the ball milling process, wherein the mass ratio of the acetic acid solution to the biomass ash is 1:30-50, granulating into spherical particles of 5-8 mm, drying, heating from room temperature to 400-500° C. at a rate of 10-15° C. / min, and calcining at 400-500° C. for 1-2 h to obtain biomass ash particles; (2) washing the biomass ash particles obtained in step (1) with water, soaking for 24-48 hours and then drying, heating the temperature from room temperature to 800-900° C. at a rate of 10-15° C. / min under nitrogen protection, and calcining at 800-900° C. for 4-6 hours; (3) immersing the biomass ash particles fired in step (2) in a mixed solution of 20% HNO3 and 20% H2SO4, ultrasonically treating for 30-60 min, stirring, heating, refluxing and oxidizing in a 70-80°C water bath for 3-4 h, cooling, and repeatedly rinsing with ultrapure water until the pH is neutral, and drying to constant weight; (4) placing the biomass ash particles dried in step (3) in a Fe2(NO)3 solution at a mass ratio of 1:10-20, shaking at 100-150 rpm for 12-24 hours, then standing for 24 hours, heating from room temperature to 400-500°C at a heating rate of 10-15°C / min, and calcining at 400-500°C for 3-4 hours to obtain the product.

10. Use of the modified biomass filler according to claim 9 in water treatment.

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