Magnesite tailing modified charcoal adsorption and purification device for livestock and poultry breeding wastewater

Abstract

The utility model discloses a magnesite tailing modified charcoal adsorption and purification device for livestock and poultry breeding wastewater, and relates to livestock and poultry breeding wastewater treatment and solid waste resource recycling. The device comprises an adsorption row, two or more adsorption columns of the same stage are arranged in the adsorption row, one end of each adsorption column is communicated with a water distribution pipeline, the other end of each adsorption column is communicated with a water collection pipeline, sealing covers are arranged on the upper portion and the lower portion of each adsorption column respectively, and a filling layer in each adsorption column comprises a non-woven fabric piece, sponge and magnesite tailing modified biochar. The downstream of the water collecting pipeline is connected with a drain pipe, the upstream of the water distributing pipeline is connected with a self-priming water pump, the drain pipe is connected with a water outlet end nitrogen and phosphorus detection probe, and a water inlet pipe of the self-priming water pump is connected with a water inlet end nitrogen and phosphorus detection probe. The device takes magnesite tailing modified biochar as an adsorbent, is economical and environment-friendly, low in operation cost and simple to operate, can perform real-time nitrogen and phosphorus detection at the inlet and the outlet of the device, achieves up-to-standard discharge, and can effectively judge saturation of the adsorbent at the same time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sewage treatment, and relates to livestock and poultry breeding wastewater treatment and solid waste resource recycling, in particular to a magnesite tailing modified biochar adsorption and purification device for livestock and poultry breeding wastewater. BACKGROUND

[0002] Livestock and poultry breeding wastewater is excrement and wastewater produced by flushing in the process of livestock and poultry breeding, and the wastewater contains high concentrations of nitrogen, phosphorus and the like. If the livestock and poultry breeding wastewater is discharged in an open manner, the surface water layer or the underground water layer will be polluted, and the water body in the water area will be eutrophicated. Moreover, if the high-concentration breeding wastewater is directly discharged into the soil without scientific treatment, the soil pores will be blocked, the soil structure will be damaged, and the soil performance will be seriously affected. In order to treat the main pollutants, nitrogen and phosphorus, in the breeding wastewater, currently, there are mainly adsorption, biological and sedimentation methods, among which the adsorption method is an important technical method for denitrification and phosphorus removal due to its simplicity and high efficiency.

[0003] The biochar adsorbent can be applied in the field of water pollution purification due to its characteristics of small density and large specific surface area. The biochar prepared by using biomass waste as raw material can reduce the use cost of the adsorbent. In order to improve the adsorption performance of the original biochar, the biochar is applied to the treatment of high-concentration nitrogen and phosphorus wastewater, and the tailings of magnesite are used to modify the biochar so as to improve the nitrogen and phosphorus recovery rate. In China, the amount of agricultural and forestry waste and magnesite tailings is large and easy to obtain. If they are reasonably disposed, not only the solid waste can be recycled, but also the purpose of "waste treatment with waste" can be achieved.

[0004] However, there are still certain limitations in treating livestock and poultry breeding wastewater by using the biochar adsorption method. After the adsorption saturation, the adsorption medium carries a large amount of pollutants, and how to easily take out the adsorption medium for reasonable treatment to avoid secondary pollution should be considered. With the development of large-scale livestock and poultry breeding industry, a suitable nitrogen and phosphorus adsorption device should be adopted for the breeding wastewater to reduce the operation cost and simplify the operation. The existing adsorption device detects whether the wastewater meets the discharge standard after treatment, and cannot effectively judge whether the adsorbent is saturated.

[0005] It should be noted that the above content belongs to the technical cognition range of the inventor and does not necessarily constitute the prior art. SUMMARY

[0006] To solve the above technical problems, the purpose of the present application is to provide a magnesite tailings modified biochar adsorption and purification device for livestock and poultry breeding wastewater, which uses tailings of magnesite and agricultural and forestry waste as raw materials for denitrification and phosphorus removal of breeding wastewater, is both economical and environmentally friendly, comprehensively utilizes biomass waste and magnesite tailings, and has important significance for realizing resource recycling of large-scale solid waste treatment. The adsorption and purification device with such adsorbent as medium has low operation cost and simple operation, nitrogen and phosphorus can be detected in real time at the inlet and outlet of the device, up to standard discharge can be achieved, and the saturation of the adsorbent can be judged. The saturated biochar carries a large amount of nitrogen and phosphorus, which can be extracted and reused as a slow-release carbon-based nitrogen and phosphorus compound fertilizer.

[0007] To achieve the above purpose, the technical scheme of the present application is as follows:

[0008] A magnesite tailings modified biochar adsorption and purification device for livestock and poultry breeding wastewater, comprising an adsorption row, two or more same-stage adsorption columns in the adsorption row, a water distribution pipeline connected to one end of the adsorption column, a water collection pipeline connected to the other end of the adsorption column, a sealing cover arranged at the upper and lower parts of the adsorption column, and a filling layer in the adsorption column, wherein the filling layer comprises non-woven fabric sheets, sponges and magnesite tailings modified biochar.

[0009] Preferably, the magnesite tailings modified biochar is wrapped in a non-woven fabric bag and filled in the middle layer of the interior of the adsorption column, and the upstream and downstream of the interior of the adsorption column are filled with the non-woven fabric sheets and the sponges.

[0010] Preferably, a partition skeleton is arranged between the sealing cover and the filling layer, the partition skeleton limits the non-woven fabric sheets, and the partition skeleton comprises a partition ring and a skeleton, and the skeleton is fixed in the partition ring.

[0011] Preferably, a drainage pipe is connected to the downstream of the water collection pipeline, and a self-priming water pump is connected to the upstream of the water distribution pipeline, and a filter screen is connected to the water inlet pipe of the self-priming water pump.

[0012] Preferably, a water outlet pipe and a water outlet end nitrogen and phosphorus detection probe are connected to the drainage pipe, a water inlet end nitrogen and phosphorus detection probe is also connected to the water inlet pipe of the self-priming water pump, the water outlet end nitrogen and phosphorus detection probe and the water inlet end nitrogen and phosphorus detection probe are connected to a detector through a detection pipe, and the detector and the motor controller of the self-priming water pump are installed in a control box.

[0013] Preferably, a pressure relief valve and a pressure gauge are installed on the water distribution pipeline and the water collection pipeline.

[0014] Preferably, a flow meter is installed on the water distribution pipeline and the water collection pipeline.

[0015] Preferably, a buffer tank is connected between the water outlet pipe of the self-priming water pump and the water distribution pipeline.

[0016] Preferably, the external extension of the adsorption purification device is provided as a box, the box is provided with pipe holes for the water outlet pipe and the water pump inlet pipe to extend out, and the front and rear sides and the side close to the adsorption row of the box are provided with box doors.

[0017] Compared with the prior art, the adsorption purification device has the following beneficial effects:

[0018] The adsorption purification device has the advantages of green environmental protection and low cost, and reduces the operation cost of the adsorption purification device.

[0019] In the adsorption purification device, after the biochar adsorption in the adsorption column is saturated, the non-woven fabric bag wrapped with biochar in the adsorption column can be taken out as a whole, and the biochar after adsorbing nitrogen and phosphorus can be used as carbon-based nitrogen and phosphorus compound slow-release fertilizer, and the carbon content in the soil can be increased and the physical and chemical properties of the soil can be improved due to the fixed carbon.

[0020] The adsorption purification device is provided with an inlet end nitrogen and phosphorus detection probe and an outlet end nitrogen and phosphorus detection probe, can realize real-time nitrogen and phosphorus concentration detection, can effectively judge whether the adsorbent is saturated, and can determine whether the discharge standard is reached according to the outlet nitrogen and phosphorus concentration detection.

[0021] The adsorption purification device is provided with a box, the device integrated into the box does not need to be pre-buried with a pipeline, has small land occupation, and has compact pipeline arrangement, is beneficial to device inspection and maintenance and adsorption column replacement, is provided with a pressure relief valve, a pressure gauge and a flowmeter on the pipeline, can ensure stable pressure of the adsorption purification device, can ensure normal and stable operation of equipment, can realize real-time monitoring of water flow in the device, and can thus optimize the number of adsorption columns. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an adsorption row structure schematic view of the adsorption purification device in the embodiment 1.

[0023] Figure 2 It is an adsorption column half-section structure schematic view of the adsorption purification device in the embodiment 1.

[0024] Figure 3 It is a partition plate framework structure schematic view of the adsorption purification device in the embodiment 1.

[0025] Figure 4 It is a left view of the adsorption purification device in the embodiment 2.

[0026] Figure 5 It is a front view of the adsorption purification device in the embodiment 2.

[0027] Figure 6A top view of the adsorption purification device in this embodiment 2.

[0028] Figure 7 A structural schematic diagram of the adsorption purification device in this embodiment 2.

[0029] Reference signs: 100. adsorption column, 101. sealing cover, 102. partition skeleton, 1021. partition ring, 1022. skeleton, 103. non-woven fabric sheet, 104. sponge, 105. magnesite tailings modified biochar, 106. adsorption column main body, 200. water distribution pipeline, 201. water distribution main pipe, 202. water distribution branch pipe, 203. water distribution secondary pipe, 204. water distribution main pipe pipe plug, 300. water collection pipeline, 301. water collection main pipe, 302. water collection branch pipe, 303. water collection secondary pipe, 304. water collection main pipe pipe plug, 400. drainage pipe, 401. water outlet pipe, 500. self-priming water pump, 501. water pump inlet pipe, 502. water pump outlet pipe, 600. control box, 601. water inlet end nitrogen and phosphorus detection pipe, 602. water outlet end nitrogen and phosphorus detection pipe, 603. self-priming water pump motor control pipe, 700. buffer water tank, 801. water distribution pipeline pressure gauge, 802. water distribution pipeline pressure relief valve, 803. water collection pipeline pressure gauge, 804. water collection pipeline pressure relief valve, 901. water distribution pipeline flow meter, 902. water collection pipeline flow meter, 110. box body. DETAILED DESCRIPTION

[0030] The utility model will be further described below in combination with embodiments. These embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model. Any non-essential change and replacement made by the person skilled in the art on the basis of the utility model all belong to the range claimed by the utility model.

[0031] In the raw materials used in the following embodiments, the magnesite tailings come from Liaoning sea area, and the corn straw biomass material comes from Jinan, Shandong. The magnesite tailings modified biochar is a modified biochar adsorption material obtained by pyrolysis of magnesite tailings and rice straw under nitrogen atmosphere, and the preparation method can refer to the Chinese invention patent application with the application number 2024114835128 and the invention name of a magnesite tailings modified biochar preparation method suitable for livestock and poultry breeding wastewater treatment. The magnesite tailings modified biochar has strong adsorption performance and more stable physicochemical properties, and can effectively adsorb nitrogen and phosphorus elements in breeding wastewater.

[0032] Embodiment 1

[0033] A magnesite tailings modified biochar adsorption purification device for livestock and poultry breeding wastewater, referring to Figure 1, including an adsorption row, which has two or more adsorption columns 100 of the same level. The number of adsorption columns in the adsorption row can be set according to the wastewater capacity and the degree of pollution. The adsorption row in this embodiment is provided with four adsorption columns 100, and the four adsorption columns 100 are connected in parallel at the same level. The water inlet end of the adsorption column 100 is connected to the water distribution pipe 200, and the water outlet end of the adsorption column 100 is connected to the water collection pipe 300. The pipelines of aquaculture wastewater treatment equipment should be reasonably arranged according to the geological conditions of the aquaculture site, the type of sewage and the degree of pollution. The cross-sectional size of the pipeline should be designed according to the flow rate and take into account the needs of long-term development. In this embodiment, the water distribution pipeline 200 includes a main water distribution pipe 201 connected to each adsorption column 100, each water distribution branch pipe 203 connected to the main water distribution pipe 201, and each water distribution secondary pipe 203 connected in sequence. One of the secondary water distribution pipes 203 is connected to one end of the main water distribution pipe 201, and the other end of the main water distribution pipe 201 is connected to the main water distribution pipe plug 204. Among the connected secondary water distribution pipes 203, two connected secondary water distribution pipes 203 can be tightly connected by a threaded elbow. The water distribution branch pipe 202 is connected to the water inlet end of the adsorption column 100 in a one-to-one correspondence. In this embodiment, four adsorption columns 100 are provided. The joint on each adsorption column 100 is connected to the corresponding water distribution branch pipe 202. The main water distribution pipe 201 is connected to each water distribution branch pipe 202 via a compression reducing tee or a socket-type internal thread tee. The water collection pipe 300 here includes a water collection main pipe 301 connected to the adsorption column 100, each water collection branch pipe 302 connected to the water collection main pipe 301, and each water collection sub-pipe 303 connected in sequence, wherein one water collection sub-pipe 303 is connected to the water collection main pipe 301, and the other end of the water collection main pipe 301 is connected to the water collection main pipe plug 304. Among the water collection sub-pipes 303 connected in sequence, the two connected water collection sub-pipes 303 can be closely connected through threaded elbows, the water collection branch pipes 302 are connected to the water outlet ends of the adsorption column 100 in a one-to-one correspondence, the joint at the water outlet end of each adsorption column 100 is connected to the corresponding water collection branch pipe 302, and the water collection main pipe 301 is connected to each water collection branch pipe 302 through a compression reducing tee or a socket-type internal thread tee.

[0034] refer to Figure 2In the embodiment, the upper and lower parts of the adsorption column 100 are respectively provided with sealing covers 101, i.e., the water outlet end and the water inlet end of the adsorption column 100 are respectively provided with the sealing covers 101. The sealing covers 101 are screwed on the adsorption column body 106, and a sealing ring is additionally arranged between the sealing cover 101 and the adsorption column body 106. The filling layer in the adsorption column 100 includes a non-woven fabric sheet 103, a sponge 104 and magnesite tailings modified biochar 105. Moreover, the adsorption column 100 is sequentially filled from top to bottom with the non-woven fabric sheet 103, the sponge 104, the magnesite tailings modified biochar 105, the sponge 104 and the non-woven fabric sheet 103. The filter layer is provided with a large effective filtration area, high pollutant capacity and strong deep adsorption capacity. The non-woven fabric sheet 103 is a polyester fiber non-woven fabric, the sponge 104 is a polyurethane filter sponge, and the magnesite tailings modified biochar 105 is a powder-shaped biochar wrapped in a non-woven fabric bag. The non-woven fabric bag wrapping the magnesite tailings modified biochar is filled in the middle layer of the adsorption column 100. In order to facilitate the removal of the non-woven fabric bag, a rope belt is arranged on the non-woven fabric bag for pulling out from the adsorption column body 106. A partition skeleton 102 is arranged between the sealing cover 101 and the upper part of the filling layer. The partition skeleton 102 includes a partition ring 1021 and a skeleton 1022, and the skeleton 1022 is fixed in the partition ring 1021. The non-woven fabric sheet 103 is limited in the partition skeleton 102. The non-woven fabric sheet 103 can intercept suspended solids, solid particles and the like in the water flow, so as to preliminarily purify the water flow and then flow through other parts of the filter layer. At the same time, the non-woven fabric sheet 103 can reduce the water flow impact, so that the water flow uniformly passes through the sponge 104 and the magnesite tailings modified biochar 105. Figure 3 The partition skeleton 102 includes a partition ring 1021 and a skeleton 1022, and the skeleton 1022 is fixed in the partition ring 1021. The non-woven fabric sheet 103 is limited in the partition skeleton 102. The non-woven fabric sheet 103 can intercept suspended solids, solid particles and the like in the water flow, so as to preliminarily purify the water flow and then flow through other parts of the filter layer. At the same time, the non-woven fabric sheet 103 can reduce the water flow impact, so that the water flow uniformly passes through the sponge 104 and the magnesite tailings modified biochar 105.

[0035] After the aquaculture wastewater is pretreated by solid-liquid separation, the water sample enters the adsorption column 100 from the water distribution pipeline 200, and then flows out from the water collection pipeline 300 after being filtered and adsorbed by the adsorption column 100. When the magnesite tailings modified biochar in the adsorption column 100 is saturated, the non-woven fabric bag wrapping the magnesite tailings modified biochar in the adsorption column 100 can be taken out as a whole. The biochar after adsorbing nitrogen and phosphorus can be used as a carbon-based nitrogen and phosphorus compound slow-release fertilizer for soil fertilization.

[0036] Example 2

[0037] Reference Figures 4 to 6The difference between the present embodiment and embodiment 1 is that in the present embodiment, the downstream of the water collecting pipe 300 is connected with a drain pipe 400, and the upstream of the water distribution pipe 200 is connected with a self-priming water pump 500, and the water inlet pipe 501 of the self-priming water pump 500 is connected with a filter screen. Here, the water inlet direction in the pipe is upstream, and the water outlet direction is downstream. The aquaculture wastewater is first pumped into the filter sedimentation tank for solid-liquid separation, and the sludge and fecal residue are precipitated, and the pretreated wastewater is then pumped into the water distribution pipe 200 by the self-priming water pump 500. The filter screen on the water pump inlet pipe 501 of the self-priming water pump 500 filters the suspended impurities, and the wastewater uniformly enters the adsorption column from the water distribution pipe 200. In the present embodiment, the wastewater flows from bottom to top through each level of the adsorption column 100, and after being filtered and adsorbed by the adsorption column 100, the wastewater flows out from the water collecting pipe 300 to the drain pipe 400.

[0038] In the present embodiment, the drain pipe 400 is connected with a water outlet pipe 401 and a nitrogen and phosphorus detection probe at the water outlet end, and the water pump outlet pipe 502 of the self-priming water pump 500 is connected with the water distribution pipe 200 through a buffer tank 700. The buffer tank 700 is connected with a nitrogen and phosphorus detection probe at the water inlet end, the nitrogen and phosphorus detection probe at the water outlet end is connected to the detector through a nitrogen and phosphorus detection pipe 602 at the water outlet end, the nitrogen and phosphorus detection probe at the water inlet end is connected to the detector through a nitrogen and phosphorus detection pipe 601 at the water inlet end, and the detector and the motor controller of the self-priming water pump 500 are installed in the control box 600. Since the wastewater treatment is a dynamic flow, the inlet water quality and flow rate are constantly changing, and the buffer tank 700 between the water pump outlet pipe 502 of the self-priming water pump 500 and the water distribution pipe 200 has a buffering effect, so that the nitrogen and phosphorus concentration is relatively stable. The nitrogen and phosphorus detection probe at the water inlet end is screwed on the upper part of the buffer tank 700, and after installation, the detection probe is embedded in the inside of the buffer tank 700; the nitrogen and phosphorus detection probe at the water outlet end is screwed downstream of the drain pipe 400, and the detection probe is embedded in the inside of the drain pipe 400, and the inlet and outlet water circuits ensure that the nitrogen and phosphorus detector provides real-time water samples, and the nitrogen and phosphorus detection data at the inlet and outlet provide data support for the water quality treatment process scheme, ensure that the outlet water quality meets the discharge standard, and provide a reference basis for whether the adsorption column is saturated. The water quality meeting the standard can be connected to the water outlet pipe 401 through the drain pipe 400 and then connected to the nearest drainage system.

[0039] The water distribution pipeline 200 in this embodiment is provided with a water distribution pipeline pressure relief valve 802 and a water distribution pipeline pressure gauge 801, and the water collection pipeline 300 is provided with a water collection pipeline pressure relief valve 804 and a water collection pipeline pressure gauge 803, so as to ensure the stable pressure in the pipeline and the stable operation of the entire device. Here, the pressure relief pipeline is arranged on the water distribution sub-pipeline 203 at a suitable position to reduce vibration and impact and protect the pressure gauge. The water distribution pipeline 200 is provided with a water inlet pipeline flow meter 901, and the water collection pipeline 300 is provided with a water collection pipeline flow meter 902, which has high accuracy in measuring instantaneous flow and can monitor the flow change in real time to guide the improvement of the adsorption and purification device in this embodiment. The water inlet pipeline flow meter 901 and the water collection pipeline flow meter 902 in this embodiment are vertically installed panel type flow meters, and the inlet and outlet connectors and fixing screw holes are arranged on the back of the flow meter body. In order to facilitate observation and operation, the installation height of the above-mentioned pressure relief valve, pressure gauge and flow meter is close to the ground clearance of the control box 600.

[0040] Reference Figure 7 The adsorption and purification device in this embodiment can be integrated and installed in the equipment treatment box body 110, the box body 110 is provided with pipe holes for the water outlet pipe 401 and the water pump inlet pipe 501 to extend out, and the front and rear sides and the side close to the adsorption row of the box body 110 are provided with box doors to facilitate device maintenance and adsorption column 100 replacement. The device is integrated into the box body 110 without the need for pre-buried pipelines, the device has small floor area and compact pipeline arrangement, and the box body 110 can protect the components in the adsorption and purification device and avoid the adverse effects of environmental factors on the mechanical and electrical properties of the device, which is beneficial to preventive maintenance and regular inspection.

Claims

1. A biochar adsorption purification device for livestock and poultry breeding wastewater using magnesite tailings modified, characterized by: It includes an adsorption row, which has two or more adsorption columns of the same level. One end of the adsorption column is connected to the water distribution pipe, and the other end of the adsorption column is connected to the water collection pipe. Sealing covers are respectively provided at the upper and lower parts of the adsorption column. The filling layer inside the adsorption column includes non-woven fabric sheets, sponges and dolomite tailings modified biochar.

2. The magnesite tailings modified biochar adsorption purification device for livestock and poultry breeding wastewater according to claim 1, characterized in that: The magnesite tailings modified biochar is wrapped in a non-woven bag and filled in the inner middle layer of the adsorption column. The upstream and downstream of the adsorption column are filled with the non-woven sheet and the sponge.

3. The magnesite tailings modified biochar adsorption purification device for livestock and poultry breeding wastewater according to claim 2, characterized in that: A partition frame is provided between the sealing cover and the filling layer, the partition frame limits the non-woven fabric sheet, the partition frame comprises a partition ring and a frame, and the frame is fixed in the partition ring.

4. The magnesite tailings modified biochar adsorption purification device for livestock and poultry breeding wastewater according to claim 3, characterized in that: The downstream of the water collection pipe is connected to a drainage pipe, the upstream of the water distribution pipe is connected to a self-priming water pump, and the water inlet pipe of the self-priming water pump is connected to a filter screen.

5. The magnesite tailings modified biochar adsorption purification device for livestock and poultry breeding wastewater according to claim 4, characterized in that: The drain pipe is connected to a water outlet pipe and a nitrogen and phosphorus detection probe at the water outlet end. The water inlet pipe of the self-priming water pump is also connected to a nitrogen and phosphorus detection probe at the water inlet end. The nitrogen and phosphorus detection probe at the water outlet end and the nitrogen and phosphorus detection probe at the water inlet end are connected to a detector via a detection pipe. The detector and the motor controller of the self-priming water pump are both installed in a control box.

6. The magnesite tailings modified biochar adsorption purification device for livestock and poultry breeding wastewater according to claim 5, characterized in that: The water distribution pipe and the water collection pipe are equipped with a pressure relief valve and a pressure gauge.

7. The biochar adsorption purification device for livestock and poultry breeding wastewater using magnesite tailings modified according to claim 6, characterized in that: Flow meters are installed on the water distribution pipe and the water collection pipe.

8. The biochar adsorption purification device for livestock and poultry breeding wastewater using magnesite tailings modified according to claim 7, characterized in that: A buffer water tank is connected between the water outlet pipe of the self-priming water pump and the water distribution pipe.

9. The biochar adsorption purification device for livestock and poultry breeding wastewater using magnesite tailings modified according to claim 8, characterized in that: The external extension of the adsorption purification device is set as a box body, the box body is provided with pipe holes for the water outlet pipe and the water pump inlet pipe to extend out, and the front and rear sides of the box body and the side close to the adsorption row are all provided with box doors.

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