CN107381969B - A kind of processing system of heavy metal industrial effluent - Google Patents

Abstract

The invention discloses a kind of processing systems of oil-containing heavy metal industrial effluent, inhale reactor, protopectin heavy metal Rotary adsorption pond, aeration nitrification tank, biological denitrificaion pond, sedimentation basin, water purifying tank including sump, coarse rack, microvesicle air supporting mineral oil adsorbent equipment, mineral oil catalysis again neutralizing.The V-type net-shaped drum that make use of equipped with pumpkin peel of the system creativeness is haptoreaction medium, when the waste water containing heavy metal is sufficiently mixed with pumpkin peel, adsorbed the heavy metal ion in waste water by the suction-operated of the water-insoluble protopectin in pericarp membrane, part residue gradually forms sludge material in adsorption tank bottom precipitation.Meanwhile the pumpkin peel in V-type net-shaped drum is as a kind of low value consumptive material, it can be according to Expenditure Levels be used to be replaced.

Description

A treatment system for heavy metal industrial wastewater

technical field

The invention relates to a treatment system for oil-containing heavy metal industrial wastewater, which belongs to the field of wastewater treatment in environmental protection.

Background technique

Heavy metal pollution refers to environmental pollution and ecological damage caused by heavy metals and their compounds, and the degree of harm depends on the concentration and chemical form of heavy metals in the environment, food and organisms. Heavy metal pollution is mainly manifested in water pollution, and partly in the atmosphere and solid waste. Heavy metal pollution is different from the pollution of other organic compounds. Many organic compounds can be purified through the physical, chemical or biological effects of nature itself, so that the hazards can be reduced or eliminated; while heavy metals are enriched and difficult to degrade in the environment.

From the perspective of environmental pollution, the most representative heavy metal pollution is mercury, cadmium, lead, and "metalloids" - arsenic and other heavy metals with significant biological toxicity. , combine with other toxins in the water to produce more toxic organic compounds.

At present, the existing industrial wastewater heavy metal treatment methods include: chemical precipitation, electrolysis, adsorption, membrane separation, ion exchange, etc.

(1) Chemical precipitation method: Dosing a certain chemical substance in industrial wastewater makes it react with certain soluble substances in the wastewater to form insoluble salts and precipitate them. This method is called chemical precipitation method. Traditional chemical precipitation methods include neutralization precipitation, sulfide precipitation and barium salt precipitation.

(2) Electrolysis method: The basic principle of electrolysis is applied to make the heavy metal ions in the wastewater undergo oxidation-reduction reactions on the anode and cathode respectively, so that the heavy metals are enriched, so that the heavy metals in the wastewater can be removed and the heavy metals can be recovered. Electrolytic treatment of heavy metal wastewater has the characteristics of reliable operation, high removal rate of heavy metals, and recyclability. However, due to the large power consumption and high investment costs when the concentration of heavy metals is low, the electrolysis method is only suitable for treating high-concentration heavy metal wastewater.

(3) Adsorption method: Adsorption method is a method of using adsorbents to adsorb heavy metals in wastewater. Traditional adsorbents include natural substances such as activated carbon, zeolite, and clay minerals. Activated carbon has strong adsorption capacity and high removal rate of heavy metals, but it is expensive and has a short service life. In recent years, it has been found that mineral materials have strong adsorption capacity, among which natural zeolite has the strongest adsorption capacity, and is also the earliest mineral material used for heavy metal wastewater treatment.

(4) Membrane separation method: Membrane separation method is to use a special semi-permeable membrane to separate and concentrate the solute and solvent under the action of external pressure without changing the chemical form of the solution. Membrane separation technology has no phase change during the reaction process, high separation efficiency, convenient operation and maintenance, simultaneous separation and concentration, and valuable heavy metals can be recovered. Common membrane technologies include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, liquid membrane, etc.

(5) Ion exchange method: The ion exchange method is used to treat heavy metal wastewater by using the exchangeable ions on the ion exchange resin to undergo exchange reactions with heavy metal ions, thereby removing heavy metal ions in wastewater. Ion exchange technology removes heavy metals in wastewater. The concentration of heavy metal ions in the purified water is much lower than that of the effluent treated by chemical precipitation. By recycling the regenerated solution, heavy metals can be recovered. The performance of ion exchange resin has a great influence on the removal effect of heavy metal ions.

But now heavy metal ions often exist in oily wastewater. The presence of oil in water seriously hinders the removal of heavy metals and reduces the treatment effect of heavy metal ions. Therefore, it is necessary to get rid of the existing treatment technology ideas, open up a new way to deal with heavy metals in industrial wastewater, and then develop a new form of industrial wastewater heavy metal treatment technology.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides a treatment system for industrial wastewater containing oily heavy metals. The system includes a water collection well, a coarse grid, a microbubble air flotation mineral oil adsorption device, and a catalytic heavy metal desorption reaction for mineral oil. tanks, protopectin-heavy metal rotary adsorption tanks, aerated nitrification tanks, biological denitrification tanks, sedimentation tanks, water purification tanks, etc.; among them, industrial wastewater containing oil and heavy metals enters the water collection well through the waste water pipeline, and the outlet of the water collection well is connected through the waste water pipeline Coarse grid, the outlet of the coarse grid is connected to the micro-bubble air flotation mineral oil adsorption device through the waste water pipeline, and the π-allyl nickel compound modified diatomite adsorption membrane in the micro-bubble air flotation mineral oil adsorption device completely absorbs the mineral oil Afterwards, the oil will be grabbed by the stainless steel mechanical arm and sent to the mineral oil catalytic desorption reactor. The heavy oil generated in the mineral oil catalytic desorption reactor will be discharged from the heavy oil discharge port and be recycled and reused. At the same time, the microbubble gas The outlet of the floating mineral oil adsorption device is connected to the original pectin-heavy metal rotary adsorption tank through the wastewater pipeline, and the sludge discharged from the original pectin-heavy metal rotary adsorption tank is transported outside for treatment, while the outlet of the original pectin-heavy metal rotary adsorption tank passes through the waste water The pipeline is connected to the aeration nitrification tank, the outlet of the aeration nitrification tank is connected to the biological denitrification tank through the wastewater pipeline, the outlet of the biological denitrification tank is connected to the sedimentation tank through the wastewater pipeline, and the outlet of the sedimentation tank is connected to the purification tank through the wastewater pipeline, and the purification tank The treated purified effluent is discharged through the waste water pipeline; among them, the micro-bubble air flotation mineral oil adsorption device is made of high-strength glass fiber reinforced plastic, and 9 ultra-fine bubble generators are installed at the bottom of the device. It accommodates a horizontally placed π-allyl nickel compound modified diatomite adsorption membrane, with a water inlet valve on the upper left side and an outlet valve on the bottom right side; the mineral oil catalytic desorption reactor adopts high-strength Made of stainless steel, 5 electric blowers are installed at the bottom, and a set of stainless steel membrane frame is installed inside the device, and 5 pieces of π-allyl nickel compound modified diatomite adsorption membranes to be treated at high temperature are placed vertically on the membrane frame, There is a heavy oil outlet on the right side of the bottom; the waste water that has initially removed large particle size substances through the coarse grid enters the device through the water inlet valve on the upper left side of the micro-bubble air flotation mineral oil adsorption device, and 9 ultra-fine bubble generators start Work, produce ultra-fine bubbles with a diameter of less than 50 μm, the ultra-fine bubbles will entrain the mineral oil molecules in the wastewater and float together, and make them be adsorbed by the π-allyl nickel compound modified diatomite adsorption film above the liquid surface, The π-allyl nickel compound modified diatomite adsorption membrane that completely adsorbs mineral oil is grasped by a stainless steel manipulator, and placed vertically on a stainless steel membrane frame in the mineral oil catalytic reforming desorption reactor, at the bottom of the reactor The 5 electric blowers of the company can produce high-temperature air at 200~250°C. At this temperature and under the catalysis of π-allyl nickel compounds, the C-H bonds in the mineral oil molecules will be temporarily broken and quickly regenerated. The combination is a C-C bond or a C-H bond, and the C-H bond will be broken again, and the C-C bond will not be broken again due to the limited catalytic effect of the π-allyl nickel compound, so mineral oil molecules with shorter carbon chains can gradually synthesized as a carbon chain Longer heavy oil molecules, at the same time, heavy oil molecules will be desorbed from the π-allyl nickel compound modified diatomite adsorption membrane at high temperature, and will be discharged from the heavy oil discharge port on the right side of the bottom of the reactor after converging; protopectin- The heavy metal rotary adsorption pool is made of hard glass fiber reinforced plastic, and the outer layer is painted with waterproof materials. The water inlet valve is installed on the upper left side of the adsorption pool, the electric telescopic rod pushing mud device is installed on the lower left side, and the electric hook claw is installed on the upper right side. The middle part of the right side is equipped with a water outlet valve, and the lower part of the right side is equipped with a sludge discharge port. The middle part of the adsorption tank is fixed with a V-shaped mesh roller by means of a rotating shaft connecting rod, and a lifting hook is installed above the V-shaped mesh roller; microbubble air flotation mineral oil The outlet water of the adsorption device enters the interior of the adsorption tank through the water inlet valve on the left side of the original pectin-heavy metal rotary adsorption tank. The V-shaped mesh drum is fully rotated under the drive of the rotating shaft and connecting rod, so that the wastewater can fully contact with the pumpkin skin and pass through the pumpkin skin. The adsorption of water-insoluble protopectin in the cells makes the heavy metal ions in the wastewater adsorbed, and the wastewater after adsorption treatment is discharged from the adsorption pool through the outlet valve. After the V-shaped mesh roller is saturated near the suction, the electric hook can be operated. Grab the lifting hook above the V-shaped mesh roller, lift the V-shaped mesh roller away from the adsorption tank, and then complete the replacement operation of the pumpkin skin. Use the electric telescopic rod to push the sludge out of the adsorption tank through the sludge outlet, and the pumpkin peel residue replaced by the V-shaped mesh roller is combined with the sludge settled at the bottom of the adsorption tank before being transported outside for treatment.

Furthermore, the original pectin-heavy metal rotary adsorption tank has an effective volume of 340m ³ , a V-shaped mesh drum with a volume of 31m ³ and a hole diameter of 7.5mm. /min.

Furthermore, the micro-bubble air flotation mineral oil adsorption device has an effective volume of 300m ³ , and the ultra-fine bubble generator can generate ultra-fine bubbles with a diameter of less than 50 μm, and the working voltage is 36V.

Furthermore, the area of the π-allyl nickel compound modified diatomite adsorption membrane is 12.6m ² , the content of π-allyl nickel compound is 22.4g/m ² , and the purity of π-allyl nickel compound is 96.2 %.

The advantages of the present invention are:

(1) This system gets rid of the existing principle of heavy metal purification and treatment of industrial wastewater, creatively uses pumpkin peel rich in protopectin and pectinase as the adsorption material for heavy metal ions, and adopts a V-shaped mesh with pumpkin peel The drum is the contact reaction medium. When the wastewater containing heavy metals is fully mixed with the pumpkin peel, the heavy metal ions in the wastewater will be adsorbed by the adsorption of the insoluble protopectin in the peel cells, thereby purifying the industrial wastewater containing heavy metals. Its heavy metal removal efficiency can reach 97.9%

(2) This system gets rid of the existing industrial wastewater mineral oil purification treatment mode, creatively adopts the technical route of combining physical means and chemical methods, and makes full use of the adsorption of modified diatomite and π-allyl nickel The catalytic synthesis of the compound makes the mineral oil in the industrial wastewater be adsorbed and enriched, and a synthesis reaction occurs to generate usable heavy oil, and the removal efficiency of the mineral oil reaches 99.7%. The modified diatomite adsorption membrane used in this system can be regenerated after the thermal desorption process, and can be reused to adsorb mineral oil in wastewater, realizing the reuse of materials and greatly reducing operating costs.

(3) This system recycles pumpkin rind, which is a waste produced in the process of agricultural production, which can realize waste utilization, turn waste into treasure, and significantly reduce the amount of waste generated in agricultural production; at the same time, pumpkin rind is used as a A low-value consumable, which can be replaced according to the usage and consumption, and the replacement cost is low. No toxic chemicals are used, thereby eliminating the risk of introducing new, more harmful contaminants.

(4) The principle of this system is simple and easy to implement, the cost of design and construction is low, and the treatment effect is good, and the cost of operation and maintenance is very low, which is conducive to large-scale promotion and application.

Description of drawings

Figure 1 is a schematic diagram of the device of the present invention.

In the figure: 1-water collection well, 2-coarse grid, 3-microbubble air flotation mineral oil adsorption device, 4-mineral oil catalytic heavy chemical desorption reactor, 5-protopectin-heavy metal rotary adsorption tank, 6-exposure Gas nitrification tank, 7- biological denitrification tank, 8- sedimentation tank, 9- water purification tank

Fig. 2 is a schematic diagram of a microbubble air flotation mineral oil adsorption device and a mineral oil catalytic reforming desorption reactor.

32-Ultrafine bubble generator, 33-Ultrafine bubble, 34-Stainless steel mechanical arm, 35-Rotary ball bearing, 36-Water inlet valve, 37-Water outlet valve; 41-Aerogel felt insulation layer, 42-π -Allyl nickel compound modified diatomite adsorption membrane, 43-stainless steel membrane frame, 44-electric blower, 45-heavy oil outlet

Figure 3 is a schematic diagram of a protopectin-heavy metal spin adsorption cell.

51-FRP tank body, 52-Rotating shaft connecting rod, 53-V-shaped mesh drum, 54-Hook, 55-Inlet valve, 56-Outlet valve, 57-Electric telescopic rod pushing mud device, 58-Sludge discharge Mouth, 59-electric claw.

Detailed ways

As shown in Figure 1, the treatment system for removing heavy metals in industrial wastewater, the system includes a water collection well 1, a coarse grid 2, a microbubble air flotation mineral oil adsorption device 3, a catalytic heavy desorption reactor 4 for mineral oil, and protopectin -Heavy metal rotary adsorption tank 5, aeration nitrification tank 6, biological denitrification tank 7, sedimentation tank 8, water purification tank 9; among them, the industrial wastewater containing oil and heavy metals enters the water collection well 1 through the wastewater pipeline, where centralized collection and preliminary Stable adjustment, the outlet of the water collection well 1 is connected to the coarse grid 2 through the wastewater pipeline, where large-diameter solid matter in the industrial wastewater is removed, and the outlet of the coarse grid 2 is connected to the microbubble air flotation mineral oil adsorption device 3 through the wastewater pipeline, and the micro After the π-allyl nickel compound-modified diatomite adsorption film 42 in the air-bubble flotation mineral oil adsorption device 3 completely absorbs mineral oil, it will be grabbed by the stainless steel mechanical arm 34 and sent to the catalytic re-decomposition of mineral oil. Absorption reactor 4, the heavy oil generated in the desorption reactor 4 for catalytic heavy conversion of mineral oil is discharged from the heavy oil outlet 45 and recycled, and at the same time, the outlet of the microbubble air flotation mineral oil adsorption device 3 is connected to the original pectin -Heavy metal rotary adsorption tank 5, the outlet of protopectin-heavy metal rotary adsorption tank 5 is connected to the aeration nitrification tank 6 through the waste water pipeline, and various nitrogen-containing substances in the wastewater are converted into nitric acid through the process of aerobic aeration here Salt nitrogen, the outlet of the aeration nitrification tank 6 is connected to the biological denitrification tank 7 through the wastewater pipeline, and its function is to decompose and transform the nitrate nitrogen in the wastewater through the biological activity reaction process, thereby removing nitrate nitrogen, and the biological denitrification tank 7 The outlet of the sedimentation tank 8 is connected to the sedimentation tank 8 through the waste water pipeline, and all the remaining insoluble substances in the waste water are removed here. The outlet of the sedimentation tank 8 is connected to the clean water tank 9 through the waste water pipeline, and the outlet of the clean water tank 9 is processed by the system through the waste water pipeline. The purified effluent is discharged outside; among them, the micro-bubble air flotation mineral oil adsorption device 3 is made of high-strength fiberglass, with an effective volume of 300m ³ , and 9 ultra-fine bubble generators 32 are installed at the bottom, which can generate ultra-fine bubbles with a diameter of less than 50 μm. The micro-bubbles 33 can accommodate a horizontally placed π-allyl nickel compound modified diatomite adsorption film 42 on the liquid surface of the device. The area of the adsorption film is 12.6m ² , and the π-allyl nickel compound The content is 22.4g/m ² , the purity of π-allyl nickel compound is 96.2%, the water inlet valve 36 is installed on the upper left side, and the water outlet valve 37 is installed on the bottom right side. Mineral oil catalytic desorption reactor 4 is connected, so it is covered with an airgel felt insulation layer 41, and the top of the airgel felt insulation layer 41 is equipped with a stainless steel mechanical arm 34 and a ball bearing 35; The suction reactor 4 is made of high-strength stainless steel, with a volume of 330m ³ . Five electric blowers 44 are installed at the bottom, which can generate hot air at 200-250°C. A set of stainless steel membrane frame 43 is installed inside the device. Five sheets of π-allyl nickel compound modified diatomite adsorption membranes 42 to be treated at high temperature can be placed vertically, and a heavy oil outlet 45 is provided on the right side of the bottom; Mineral oil industrial waste water enters the interior of the device through the water inlet valve 36 on the upper left side of the micro-bubble air flotation mineral oil adsorption device 3, and 9 ultra-fine bubble generators 32 start to work to generate ultra-fine bubbles 33 with a diameter of less than 50 μm. Bubbles 33 will entrain the mineral oil molecules in the waste water and float up together, and make them be adsorbed by the modified diatomite adsorption film 42 containing π-allyl nickel compound on the liquid surface, completely absorbing the π-allyl containing mineral oil The nickel-based compound modified diatomite adsorption membrane 42 is grasped by the stainless steel mechanical arm 34, and placed vertically on the stainless steel membrane frame 43 in the mineral oil catalytic reforming desorption reactor 4, and the five electric heating drums at the bottom of the reactor The blower 44 starts to work to generate high-temperature air at 200~250°C. Under the catalysis of the π-allyl nickel compound, the CH bond in the mineral oil molecule will be temporarily broken and quickly recombined into a CC bond or a CH bond , and the CH bond will be broken again, and the CC bond will not be broken again due to the limited catalytic effect of the π-allyl nickel compound, so mineral oil molecules with shorter carbon chains can be gradually synthesized into longer carbon chains. heavy oil molecules. At the same time, heavy oil molecules will be desorbed from the π-allyl nickel compound-containing modified diatomite adsorption membrane 42 at high temperature, and after converging, they will be discharged from the heavy oil outlet 45 on the right side of the bottom of the reactor, which can be collected and reused .

The original pectin-heavy metal rotary adsorption tank 5 is made of hard fiberglass, and the outer layer is painted with waterproof material. The upper left side of the adsorption tank is equipped with a water inlet valve 55, and the lower left side is equipped with an electric telescopic rod pushing mud device 57. An electric hook 59 is installed on the top, a water outlet valve 56 is installed in the middle of the right side, and a sludge discharge port 58 is arranged on the lower right side. A lifting hook 54 is installed above the 53; the industrial waste water after the pH adjustment treatment (the pH value after treatment is 7.5~8.5) enters the interior of the adsorption pool through the water inlet valve 55 on the left side of the protopectin-heavy metal rotary adsorption pool 5, V The type mesh drum 53 is fully rotated under the drive of the rotating shaft connecting rod 52, so that the wastewater is fully contacted with the pumpkin skin, and the heavy metal ions in the wastewater are adsorbed through the adsorption of the non-water-soluble protopectin in the pumpkin skin cells. The treated wastewater is discharged from the adsorption pool through the water outlet valve 56. After the V-shaped mesh drum 53 is saturated near the suction, the electric hook 59 can be operated to grab the lifting hook 54 above the V-shaped mesh drum 53, and the V-shaped mesh drum 53 53 lifts away from the adsorption tank, and then completes the replacement operation of the pumpkin skin. At the same time, part of the pumpkin skin residue settles at the bottom of the adsorption tank and gradually forms sludge. The electric telescopic rod pusher 57 can be used to discharge the adsorption tank through the sludge discharge port 58 , the pumpkin peel residue replaced by the V-shaped mesh drum 53 is combined with the sludge material deposited at the bottom of the adsorption tank and then transported outside for treatment.

The industrial wastewater treated by this system has a heavy metal removal efficiency of 97.9%.

Claims (1)

1. A treatment system for heavy metal industrial waste water, characterized in that the system comprises a water collection well, a coarse grid, a microbubble air flotation mineral oil adsorption device, a catalytic heavy metal desorption reactor for mineral oil, and a former pectin-heavy metal rotary adsorption tanks, aeration nitrification tanks, biological denitrification tanks, sedimentation tanks, and water purification tanks; among them, industrial wastewater containing oil and heavy metals enters the collection well through the wastewater pipeline, and the outlet of the collection well is connected to the coarse grid through the wastewater pipeline, and the outlet of the coarse grid passes through The wastewater pipeline is connected to the micro-bubble air flotation mineral oil adsorption device. The π-allyl nickel compound modified diatomite adsorption film in the micro-bubble air flotation mineral oil adsorption device will be grasped by the stainless steel mechanical arm after completely absorbing the mineral oil. And it is sent to the mineral oil catalytic desorption reactor. The heavy oil generated in the mineral oil catalytic desorption reactor is discharged from the heavy oil discharge port and recycled. At the same time, the outlet of the microbubble air flotation mineral oil adsorption device passes through the waste water pipeline. Connect the original pectin-heavy metal rotary adsorption tank, and the sludge discharged from the original pectin-heavy metal rotary adsorption tank is transported outside for treatment. At the same time, the outlet of the original pectin-heavy metal rotary adsorption tank is connected to the aeration nitrification tank through the waste water pipeline for aeration and nitrification The outlet of the pool is connected to the biological denitrification tank through the wastewater pipeline, the outlet of the biological denitrification tank is connected to the sedimentation tank through the wastewater pipeline, the outlet of the sedimentation tank is connected to the clean water tank through the waste water pipeline, and the outlet of the clean water tank is connected to the purified water through the waste water pipeline. The water is purified and discharged; among them, the micro-bubble air flotation mineral oil adsorption device is made of high-strength glass fiber reinforced plastic, with an effective volume of 300m ³ , and 9 ultra-fine bubble generators are installed at the bottom, which can generate ultra-fine bubbles with a diameter of less than 50μm. The voltage is 36V, and a horizontally placed π-allyl nickel compound modified diatomite adsorption film is placed above the liquid surface of the device, with a water inlet valve on the upper left side and an outlet valve on the bottom right side; The oil catalytic heavy chemical desorption reactor is made of high-strength stainless steel, with 5 electric blowers installed at the bottom, and a set of stainless steel membrane frame installed inside the device, and 5 sheets of π-allyl to be treated at high temperature are placed vertically on the membrane frame. The nickel compound modified diatomite adsorption membrane has a heavy oil discharge port on the right side of the bottom; the wastewater that has passed through the coarse grid to initially remove large particle size substances enters the device through the water inlet valve on the upper left side of the microbubble air flotation mineral oil adsorption device Inside, 9 ultra-fine bubble generators start working to generate ultra-fine bubbles with a diameter of less than 50 μm. The ultra-fine bubbles will entrain the mineral oil molecules in the wastewater and float up together, and make them be absorbed by the π-allyl nickel above the liquid surface. The compound modified diatomite adsorption membrane is adsorbed, and the π-allyl nickel compound modified diatomite adsorption membrane that completely absorbs mineral oil is grasped by a stainless steel manipulator and placed vertically in the mineral oil catalytic reforming desorption reactor On the stainless steel membrane frame in the reactor, 5 electric blowers at the bottom of the reactor can generate high-temperature air at 200-250°C. At this temperature and under the catalysis of the π-allyl nickel compound, the CH in the mineral oil molecule The bond will be broken briefly and quickly recombine into a CC bond or a CH bond, while the CH bond will be broken again, and the CC bond will not be broken again due to the limited catalytic effect of the π-allyl nickel compound, so This makes the mineral oil molecules with shorter carbon chains gradually synthesize into heavy oil molecules with longer carbon chains. At the same time, the heavy oil molecules will desorb from the π-allyl nickel compound modified diatomite adsorption film at high temperature, and then gather from The heavy oil outlet on the right side of the bottom of the reactor is discharged; the original pectin-heavy metal rotary adsorption tank is made of hard glass fiber reinforced plastic, and the outer layer is painted with waterproof materials. Telescopic rod mud pushing device, electric hook claws are installed on the upper right side, water outlet valve is installed on the middle part of the right side, sludge discharge port is installed on the lower right side, and a V-shaped mesh roller is fixed in the middle part of the adsorption pool by means of a rotating shaft connecting rod. There is a lifting hook on the top of the mesh drum; the outlet water of the microbubble air flotation mineral oil adsorption device enters the interior of the adsorption pool through the water inlet valve on the left side of the original pectin-heavy metal rotary adsorption pool, and the V-shaped mesh drum is driven by the rotating shaft and connecting rod. Rotate fully to make the wastewater fully contact with the pumpkin skin, and the heavy metal ions in the wastewater are adsorbed through the adsorption of the non-water-soluble protopectin in the cells of the pumpkin skin, and the wastewater after adsorption treatment is discharged from the adsorption pool through the outlet valve, V After the V-shaped mesh roller is saturated near the suction area, operate the electric claw to grab the lifting hook above the V-shaped mesh roller, lift the V-shaped mesh roller from the adsorption pool, and then complete the replacement operation of the pumpkin skin. At the same time, part of the pumpkin peel The residue settles at the bottom of the adsorption tank and gradually forms sludge, which is discharged out of the adsorption tank through the sludge outlet by using the electric telescopic rod pusher. The pumpkin peel residue replaced by the V-shaped mesh roller and the sludge deposited at the bottom of the adsorption tank Sinotrans handling after merger; The area of the π-allyl nickel compound modified diatomite adsorption membrane is 12.6m ² , the content of π-allyl nickel compound is 22.4g/m ² , and the purity of π-allyl nickel compound is 96.2%.