A biological filtration system suitable for pesticide residue wastewater treatment

Abstract

The application relates to the technical field of pesticide residue wastewater treatment, and discloses a biological filtration system suitable for pesticide residue wastewater treatment, which comprises the following components: a photovoltaic component for providing power for the biological filtration system; a control monitoring system for monitoring filtration data and controlling the sewage flow rate of the biological filtration unit; a sewage pool for collecting pesticide residue wastewater; a biological filtration unit adopting a filter box filled with fully mixed and uniform straw, substrate and soil as the filtration unit; and a clean water pool for collecting filtered water after pesticide residue filtration. The biological filtration system can greatly filter and purify pesticide residues in the pesticide residue wastewater, and the degradation rate of imidacloprid at the water outlet after filtration is more than 99%, so that the harm of pesticide residues to the environment and plants can be greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of agricultural wastewater treatment technology, and more specifically to a biological filtration system suitable for treating agricultural wastewater. Background Technology

[0002] Agricultural wastewater refers to water polluted by excessive use or improper treatment of chemical substances such as fertilizers and pesticides during agricultural production. It typically arises after users mix pesticides with water and spray the product, leaving behind residual pesticide residue. Several methods are generally used to address this issue:

[0003] 1. Continue spraying the remaining pesticides until spraying is complete.

[0004] 2. Spray the remaining pesticides onto other crops.

[0005] Plant protection machinery is widely used in the pesticide application stage of agricultural production management. However, the large amount of low-concentration pesticide residue rinsing water and small amount of medium- and high-concentration pesticide residue liquid generated after the application are directly discharged into nearby farmland or water bodies due to the lack of supporting treatment technology and equipment, causing safety hazards and environmental pollution. In reality, continuing to spray pesticides until they are completely applied is not in line with the scientific cultivation of crops. Excessive spraying can significantly affect crop growth and may also lead to pesticide concentration exceeding the standard after harvest. Spraying the remaining pesticides on other crops also presents problems, as some plants do not need to be sprayed or there are still residues after spraying. Often, users illegally dispose of the remaining pesticides. Therefore, this invention provides a biological filtration system suitable for the treatment of pesticide residue wastewater. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the present invention provides a biological filtration system suitable for the treatment of agricultural residue wastewater, so as to solve the problems existing in the background art.

[0007] This invention provides the following technical solution: a biological filtration system suitable for treating pesticide residue wastewater, comprising the following components:

[0008] Photovoltaic modules: used to provide power for biological filtration systems;

[0009] Control and monitoring system: used to monitor filtration data and control the wastewater flow rate of the biological filtration unit;

[0010] Wastewater pond: A water tank used to collect wastewater containing pesticide residues;

[0011] Biological filtration unit: The filtration unit uses a filter box containing a thorough and uniform mixture of straw, substrate, and soil.

[0012] Water purification tank: Used to collect filtered water after removing pesticide residues;

[0013] The specific process is as follows:

[0014] First, the straw is crushed. Simultaneously, finely sieved soil containing peat, perlite, and microbial agents is mixed with the straw and soil to form a biological mixed substrate. This substrate is then placed into the filter box of the biological filtration unit. Temperature and humidity sensors are installed in the filter box to detect changes in temperature and humidity. The results are obtained by comparing the detected temperature and humidity with the subsequent purification effect. The flow rate of wastewater entering the biological filtration unit is adjusted according to the temperature, humidity, and pH value. The pesticide residue removal rate of the purified water can also be adjusted by adjusting the temperature and humidity. The filtered water is then introduced into a water purification tank.

[0015] Furthermore, to improve the filtration effect on pesticide residues, multiple filter boxes can be connected in series during filtration. When connecting them in series, they are stacked. The multiple filter boxes are divided into primary filter boxes, secondary filter boxes, tertiary filter boxes, and so on. During filtration, the wastewater is pumped into the primary filter box located at the top by a water pump. The bottom of the primary filter box is connected to the top of the secondary filter box through a water pipe. The bottom of the secondary filter box is connected to the top of the tertiary filter box, and so on until the last stage is connected to the water purification tank.

[0016] Furthermore, when the sewage in the sewage tank is pumped into the primary filter box by a water pump, the sewage is sprayed onto the surface of the biological mixed substrate using atomizing nozzles. The bottom of the primary filter box is connected to the top of the secondary filter box via a water pipe. Each filter box has an activated carbon interlayer installed at its bottom outlet. The water pipe connecting to the top of the secondary filter box is connected to a diversion pipe for diversion. If the height does not allow for stacking, the filter box is divided into multiple groups. During stacking, a water pump is installed in the previous group to pump the filtered water from the previous group into the bottom of the next group.

[0017] Furthermore, the substrate containing peat, perlite, and microbial agents is mixed with soil and straw in a volume ratio of 1:1:1 to prepare a biological mixed substrate. The substrate containing peat, perlite, and microbial agents has a pH of 5.5-8.5 and an organic matter content of 40%-85%.

[0018] Furthermore, a 10-centimeter gap is left between the top of the biological mixed substrate inside the filter box and the top of the filter box, so that it can be evenly sprayed onto the biological mixed substrate during subsequent spraying.

[0019] Furthermore, the specific connection method is as follows:

[0020] Wastewater is pumped into the primary tank via a water pump. The wastewater is then atomized and evenly sprayed onto the top of the biological mixed substrate within the primary tank via atomizing nozzles. Under gravity, the wastewater is filtered by the biological mixed substrate and then flows through the activated carbon interlayer at the outlet to the secondary tank's distribution pipe for diversion. This ensures that the treated water from the primary tank is evenly distributed on top of the biological mixed substrate in the secondary tank. This process continues. If multiple sets are connected in series, a water pump needs to be installed at the last outlet of the first set to pump the treated wastewater from the first set into the primary tank of the second set. Finally, the wastewater flows into the purification tank, and the entire system is powered by photovoltaic modules.

[0021] The technical effects and advantages of this invention are as follows:

[0022] This invention achieves a significant filtration and purification effect on pesticide residues in agricultural wastewater through a biological filtration system. After filtration, the degradation rate of imidacloprid at the outlet reaches over 99%, which greatly reduces the harm of pesticide residues to the environment and plants. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the biological filtration system of the present invention.

[0024] Figure 2 This is a schematic diagram of the biological filtration system of the present invention.

[0025] Figure 3 This is a schematic diagram of pesticide residues after filtration in an experiment according to the present invention.

[0026] Figure 4 This is a diagram of pesticide residues after secondary filtration in this invention.

[0027] Schematic diagram Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The biological filtration system for treating pesticide residue wastewater involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Reference Figure 1-4 The present invention provides the following technical solution: a biological filtration system suitable for treating pesticide residue wastewater, comprising the following components:

[0030] Photovoltaic modules: used to provide power for biological filtration systems;

[0031] Control and monitoring system: used to monitor filtration data and control the wastewater flow rate of the biological filtration unit;

[0032] Wastewater pond: A water tank used to collect wastewater containing pesticide residues;

[0033] Biological filtration unit: The filter unit is a filter box containing a thorough and uniform mixture of straw, substrate and soil, with a standard 1m*1m*1m cubic PVC box as the carrier for each biological filtration unit.

[0034] Water purification tank: Used to collect filtered water after removing pesticide residues;

[0035] The specific process is as follows:

[0036] First, the straw is crushed. Simultaneously, finely sieved soil containing peat, perlite, and microbial agents is mixed with the straw and soil to form a biological composite substrate. This substrate is then placed into the filter box of the biological filtration unit. Temperature and humidity sensors are installed in the filter box to detect changes in temperature and humidity. The detected temperature and humidity are compared with the subsequent purification effect to obtain results. The flow rate of wastewater entering the biological filtration unit is adjusted based on temperature, humidity, and pH value. Adjusting temperature and humidity can also regulate the pesticide residue removal rate of the purified water during filtration. The filtered water is then introduced into a purification tank, powered by photovoltaic modules. During operation, a control and detection system monitors the temperature chamber. When the flow rate in the chamber is detected to be low, the control system activates the wastewater pump in the wastewater tank, pumping wastewater into the chamber. During filtration, once the sewage volume in the wastewater tank reaches the specified level, the water pump is activated to pump sewage into the tank for filtration. If the temperature is detected to be too high during filtration, the water pump will increase the sewage flow into the tank to lower the temperature. If the temperature decreases, the water pump's injection rate will be reduced to decrease the amount of sewage processed by the tank at any given time, ensuring filtration effectiveness. The pH value is also monitored, and the pumping rate is adjusted accordingly. If the pH value is high, sewage is pumped in. If a large amount of sewage is detected during sewage inflow, pumping is stopped to ensure filtration effectiveness. If the sewage volume is low, pumping continues normally. If the pH value is low, pumping is stopped until the pH value returns to normal. Then, sewage is pumped in again based on the sewage tank's water volume.

[0037] Furthermore, to improve the filtration effect on pesticide residues, multiple filter boxes can be connected in series during filtration. When connecting them in series, they are stacked. The multiple filter boxes are divided into primary filter boxes, secondary filter boxes, tertiary filter boxes, and so on. During filtration, the wastewater is pumped into the primary filter box located at the top by a water pump. The bottom of the primary filter box is connected to the top of the secondary filter box through a water pipe. The bottom of the secondary filter box is connected to the top of the tertiary filter box, and so on until the last stage is connected to the water purification tank.

[0038] Furthermore, when the sewage in the sewage tank is pumped into the primary filter box by a water pump, the sewage is sprayed onto the surface of the biological mixed substrate using atomizing nozzles. The bottom of the primary filter box is connected to the top of the secondary filter box via a water pipe. Each filter box has an activated carbon interlayer installed at its bottom outlet. The water pipe connecting to the top of the secondary filter box is connected to a diversion pipe for diversion. If the height does not allow for stacking, the filter box is divided into multiple groups. During stacking, a water pump is installed in the previous group to pump the filtered water from the previous group into the bottom of the next group.

[0039] Furthermore, the substrate containing peat, perlite, and microbial agents is mixed with soil and straw in a volume ratio of 1:1:1 to prepare a biological mixed substrate. The substrate containing peat, perlite, and microbial agents has a pH of 5.5-8.5 and an organic matter content of 40%-85%.

[0040] Furthermore, a 10-centimeter gap is left between the top of the biological mixed substrate inside the filter box and the top of the filter box, so that it can be evenly sprayed onto the biological mixed substrate during subsequent spraying.

[0041] Furthermore, the specific connection method is as follows:

[0042] Wastewater is pumped into the primary tank via a water pump. The wastewater is then atomized and evenly sprayed onto the top of the biological mixed substrate within the primary tank by atomizing nozzles. Under gravity, the wastewater is filtered by the biological mixed substrate and then flows through the activated carbon interlayer at the outlet to the diversion pipe of the secondary tank for distribution. This ensures that the treated water from the primary tank is evenly distributed on top of the biological mixed substrate in the secondary tank. This process is repeated. If multiple sets are connected in series, a water pump needs to be installed at the last outlet of the first set to pump the wastewater treated by the first set into the primary tank of the second set. Finally, the wastewater flows into the clean water tank, and the entire system is powered by photovoltaic modules.

[0043] The experiment was designed by extracting and analyzing wastewater containing imidacloprid pesticide residues from the orchard application process, as well as the filtered purified water. To improve accuracy, a set of experiments was provided:

[0044] Control group: Wastewater with pesticide residues, imidacloprid content 2.8 mg / L;

[0045] Experimental group 1: 10ml of secondary filtered water;

[0046] Experimental group 2: 10ml of secondary filtered water;

[0047] Experimental group 3: 10ml of secondary filtered water;

[0048] Experimental group 4: 10ml of four-stage filtered water;

[0049] Experimental group 5: 10ml of four-stage filtered water;

[0050] Experimental group 6: 10ml of four-stage filtered water;

[0051] The pesticide residue levels were tested. The secondary filtration system used two connected chambers, and the quaternary filtration system used four connected chambers. Pesticide residues in the filtered water within each chamber were also tested. The results are as follows:

[0052]

[0053]

[0054] As shown above, the biological filtration unit effectively filters pesticide residues in the wastewater, and it was found that increasing the size of the chamber can enhance the filtration effect. To verify the experimental results, a secondary experiment was conducted using wastewater with different concentrations of pesticide residues.

[0055] Control group: Wastewater with pesticide residues, imidacloprid content 8.4 mg / L;

[0056] Experimental group 1: 10ml of secondary filtered water;

[0057] Experimental group 2: 10ml of secondary filtered water;

[0058] Experimental group 3: 10ml of secondary filtered water;

[0059] Experimental group 4: 10ml of four-stage filtered water;

[0060] Experimental group 5: 10ml of four-stage filtered water;

[0061] Experimental group 6: 10ml of four-stage filtered water;

[0062]

[0063] In summary, the biological filtration system of this invention achieves a significant filtration and purification effect on pesticide residues in agricultural wastewater, with a degradation rate of over 99% for imidacloprid at the outlet after filtration.

[0064] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0065] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0066] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A biofiltration system suitable for the treatment of pesticide residue contaminated water, characterised in that: The components include: photovoltaic components: for providing power for the biological filtration system; control monitoring system: for monitoring filtration data, and controlling the sewage flow rate of the biological filtration unit; sewage pool: for collecting pesticide residue sewage; biological filtration unit: by using a filter box filled with straw, substrate, and soil mixed evenly as a filter unit; clean water pool: for collecting filtered water after filtering pesticide residues; The specific process is as follows: First, the straw is crushed, and the soil after fine screening, the substrate containing peat, perlite and microbial inoculant, are mixed with the straw and soil to form a biological mixed substrate, which is loaded into the filter box of the biological filtration unit. At the same time, a temperature and humidity sensor is installed in the filter box to detect the change of temperature and humidity in the filter box. The results are obtained by comparing the detected temperature and humidity with the later purification effect. The flow rate of sewage into the biological filtration unit is adjusted according to the temperature and humidity and pH value. The removal rate of pesticide residues in the purified water during filtration can also be adjusted by adjusting the temperature and humidity, and the filtered water is introduced into the clean water pool.

2. The biological filtration system for treating pesticide residue contaminated wastewater according to claim 1, characterized in that: To improve the effect of filtering pesticide residues, multiple filter boxes can be connected in series. When connected in series, they are stacked. According to the number of filter boxes, they are divided into first-level filter boxes, second-level filter boxes, third-level filter boxes, and so on. During filtration, sewage is pumped into the first-level filter box at the top end by a water pump. The bottom end of the first-level filter box is connected to the top end of the second-level filter box through a water pipe. The bottom end of the second-level filter box is connected to the top end of the third-level filter box, and so on, until the last level is connected to the clean water pool.

3. The biological filtration system for treating pesticide residue contaminated wastewater according to claim 1, characterized in that: When the sewage in the sewage pool is pumped into the first-level filter box by the water pump, the sewage is sprayed on the surface of the biological mixed substrate by the atomizing nozzle. The bottom end of the first-level filter box is connected to the top end of the second-level filter box through a water pipe. An activated carbon interlayer is installed at the water outlet of the bottom end of each filter box. The water pipe connected to the top end of the second-level filter box is connected with a shunt pipe for shunting. If the height does not allow when stacking, it is divided into multiple groups for stacking. When stacking, a water pump is installed in the previous group to pump the filtered water into the bottom end of the next group.

4. The biological filtration system for treating pesticide residue contaminated wastewater according to claim 1, characterized in that: The substrate containing peat, perlite and microbial inoculant is mixed with soil and straw in a volume ratio of 1:1:1 to prepare the biological mixed substrate. The substrate containing peat, perlite and microbial inoculant has a pH of 5.5-8.5 and an organic matter content of 40%-85%.

5. The biological filtration system for treating pesticide residue-contaminated wastewater according to claim 1, wherein: The top of the biological mixed substrate in the filter box is 10 cm away from the top end of the filter box, which facilitates uniform spraying on the biological mixed substrate during later spraying.

6. The biological filtration system for treating pesticide residue-contaminated wastewater according to claim 1, wherein: The specific connection method is: The sewage pool pumps the sewage into the primary box by the water pump, and the sewage is atomized and uniformly sprayed on the top of the biological mixed substrate in the primary box by the atomizing nozzle. After being filtered by the biological mixed substrate under the gravity, the sewage passes through the activated carbon interlayer at the water outlet, flows to the shunt pipe of the secondary box for shunting, so that the treated water filtered by the primary filter is uniformly on the top of the biological mixed substrate of the secondary box. In this way, if a plurality of groups are connected in series, a water pump needs to be arranged at the water outlet of the last group to pump the sewage treated by the first group of boxes into the primary box of the second group, and finally flows into the clean water pool. The photovoltaic module supplies power to the whole system.

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