CN113415917A - Zero-valent iron wastewater treatment system and treatment method coupled with surface updating device - Google Patents
Zero-valent iron wastewater treatment system and treatment method coupled with surface updating device Download PDFInfo
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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Abstract
The invention relates to a zero-valent iron wastewater treatment system and a treatment method coupled with a surface updating device, wherein the system comprises a filtering device, the surface updating device, a mixed reaction tank filled with zero-valent iron materials, a precipitation separation tank and a slurry buffer tank, wherein the filtering device is arranged at the upstream and is respectively communicated with the surface updating device and the mixed reaction tank, the surface updating device, the mixed reaction tank, the precipitation separation tank and the slurry buffer tank are sequentially arranged and communicated to form a large circulation loop, the mixed reaction tank and the surface updating device are communicated to form a small circulation loop, the surface updating device comprises a shell, a power mechanism and a stirring shaft in transmission connection with the power mechanism, a cavity is arranged in the shell, and a surface updating auxiliary medium and zero-valent iron materials are filled in the cavity. Compared with the prior art, the method can effectively remove the passive film on the surface of the zero-valent iron, maintain the high activity of the zero-valent iron material, improve the reaction utilization rate of the material, and realize the high-efficiency utilization of the zero-valent iron and the high-efficiency removal of pollutants.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a zero-valent iron wastewater treatment system and a zero-valent iron wastewater treatment method coupled with a surface updating device.
Background
Heavy metals and refractory organic matters (such as polychlorinated biphenyl, polycyclic aromatic hydrocarbon, halogenated hydrocarbon, phenols, aniline, nitrobenzene, dyes, surfactants, polymer monomers and the like) in part of industrial wastewater are more, and the utilization of zero-valent iron is a common method for treating the wastewater. For example, patent CN110642451A (a method and apparatus for rapidly degrading azo-containing wastewater) describes a method for treating azo-containing wastewater by using a reaction medium system with magnetic zero-valent iron, wherein the reaction system uniformly mixes magnetized micron zero-valent iron and filling medium for wastewater treatment. Patent CN110451627A (nano iron composite nickel material, its preparation method, application and method for purifying chlorinated organic compound wastewater) introduces a method for treating chlorinated organic compound wastewater by using nano iron composite nickel material. Patent CN109626567A (a method for anaerobic treatment of refractory organic wastewater) introduces a method for treating coke wastewater by using anaerobic zero-valent iron, wherein anaerobic activated sludge, zero-valent metal and transition metal compounds are fully mixed and reacted at a stirring speed of 50-120 r/min. Patent CN110877938A (a method for treating organic arsenic wastewater and stabilizing arsenic) describes a method for treating organic arsenic wastewater by using zero-valent iron, and the zero-valent iron and complex are added and stirred to realize effective separation of inorganic arsenic. The patent CN107200392B (a vulcanization modified Fe-Cu bimetallic material, a preparation method and a method for removing chromium-containing wastewater) introduces a method for treating chromium-containing wastewater by adopting the vulcanization modified Fe-Cu bimetallic material, wherein the vulcanization modified Fe-Cu bimetallic material is added into the chromium-containing wastewater, and the mixture is continuously reacted under the stirring state at the rotating speed of 300-500 r/min for 10-60 min. None of the above patents mention or relate to the treatment of the zero-valent iron material after reaction and the material efficiency improvement measures.
In addition, fixed bed reactors are the primary reaction form of zero-valent iron technology. For example, patent CN108840424A (a mixed material for sewage treatment and a sewage treatment method) describes that zero-valent iron and solid filler are mixed as a fixed bed, wherein the particle size of the zero-valent iron is 0.1mm to 5mm, and the volume ratio of the zero-valent iron to the solid filler is 1:1 to 1:20, an oxidant is added into sewage to be purified, a water body containing the oxidant flows through a filter bed, the sewage to be treated flows through the fixed bed, and the purified water body flows out from an outlet end of the fixed bed. And when the bed body is blocked to a certain degree, the filling material in the fixed bed is cleaned by a back washing method. The fixed bed patent also comprises CN108996564B (an integrated fixed bed reactor for automatically sampling and monitoring parameters in real time and application), and CN104591510B (a treatment process of nonferrous metallurgy ammonia-containing wastewater).
The reaction of zero-valent iron and pollutants in water is mostly a solid-liquid interface reaction, and the surface area and the structure of an iron material have great influence on the reaction efficiency. The surface of the zero-valent iron is oxidized to form an oxide film, so that the reaction of the zero-valent iron and pollutants in water is hindered, and the reactivity of the zero-valent iron is reduced. In order to solve the problem, powder particles with higher specific surface area or acid washing measures are generally adopted to pre-clean the zero-valent iron material to remove the oxide film on the surface of the particles. For example, patent CN112169748A (an adsorbent and its preparation method and application) describes the use of powder particles with higher specific surface area for treating thallium-containing wastewater. Patent CN108311117B (a magnetic biochar material for heavy metal wastewater treatment and a preparation method thereof) describes the treatment of heavy metal wastewater by using powder particles with higher specific surface area. Patent CN110918068A (a nano zero-valent iron microgel composite material, a preparation method and a regeneration method thereof) introduces a method for cleaning zero-valent iron by using a hydrochloric acid solution.
However, in practice, neither of the above two measures can solve the problem of surface passivation during the reaction of zero-valent iron, mainly because: (1) the wastewater contains suspended matters, viscous substances and the like, and can be adsorbed on the surface of zero-valent iron to passivate the zero-valent iron; (2) deposition of reaction products such as copper, nickel and arsenic on the surface of the iron particles also results in passivation of the surface of the zero-valent iron. Both of the above two reasons can lead to the surface passivation of the iron particles, so that the residual zero-valent iron on the surface of the iron particles cannot be fully utilized, the reaction efficiency is reduced, and the zero-valent iron is wasted.
Disclosure of Invention
The invention aims to provide a zero-valent iron wastewater treatment system and a zero-valent iron wastewater treatment method coupled with a surface updating device, which can be used for treating complex industrial wastewater, and aims to keep high reaction activity of a zero-valent iron material in a reaction process, reduce invalid material loss caused by surface passivation and passivation of the zero-valent iron material, improve the utilization efficiency of the zero-valent iron material and ensure the effluent quality.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a zero-valent iron effluent disposal system of coupling surface updating device, the system includes filter equipment, surface updating device, fills the mixed reaction tank, precipitation separation pond and the slurry buffer pool that have zero-valent iron material, filter equipment locates the upper reaches, communicates each other with surface updating device and mixed reaction tank respectively, surface updating device, mixed reaction tank, precipitation separation pond and slurry buffer pool set gradually and communicate and form big circulation circuit, communicate between mixed reaction tank and the surface updating device and form little circulation circuit, the surface updating device includes casing, power unit and the (mixing) shaft of being connected with the power unit transmission, be equipped with the cavity in the casing, power unit is located outside the casing, the (mixing) shaft is located the cavity, it has surface updating auxiliary medium and zero-valent iron material to fill in the cavity. The stirring shaft drives the surface updating auxiliary medium to rotate at a high speed, and the surface updating auxiliary medium rotating at the high speed and the zero-valent iron material rub against each other to update the surface of the zero-valent iron material.
The power mechanism comprises a motor and a transmitter in transmission connection with the motor, and the transmitter is in transmission connection with the stirring shaft. The power output by the motor is transmitted to the stirring shaft by the transmitter, so that the stirring shaft runs.
The surface renewal auxiliary medium adopts zirconia balls or iron balls, which are all wear-resistant environment-friendly materials.
The particle size of the surface updating auxiliary medium is between 0.2mm and 10mm, when the particle size of the surface updating auxiliary medium is larger than 10mm, the surface updating capability is reduced too fast, and when the particle size of the surface updating auxiliary medium is smaller than 0.2mm, the medium cost is too high, and the system energy consumption is large.
The filling amount of the surface renewal auxiliary medium is 60-90%, when the filling amount is less than 60%, the renewal effect is not generated, and when the filling amount is more than 90%, the cost and the energy consumption are high.
The zero-valent iron material is selected from one or more of simple substance iron powder, reduced iron powder, cast iron powder, raw iron powder or iron shavings.
The filtering device is selected from one or more of a tubular filter, a sand filter, an activated carbon filter or a fiber filter.
And a stirrer is arranged in the mixing reaction tank, and the rotating speed of the stirrer can be adjusted according to actual conditions.
The selective stirring module is arranged in the slurry buffer pool and can be a stirrer.
And a pump (a lifting pump can be adopted) is arranged between the slurry buffer tank and the surface updating device, and the pump is also communicated with the mixing reaction tank.
An overrunning pipe is arranged between the filtering device and the mixing reaction tank, a first pipeline is arranged between the filtering device and the surface updating device, a second pipeline is arranged between the surface updating device and the mixing reaction tank, a third pipeline is arranged between the mixing reaction tank and the precipitation separation tank, a fourth pipeline is arranged between the sedimentation separation tank and the slurry buffer tank, a fifth pipeline is arranged between the slurry buffer tank and the pump, a sixth pipeline is arranged between the pump and the first pipeline, a seventh pipeline is arranged between the pump and the mixing reaction tank, the overrunning pipe is provided with a first valve, the first pipeline is sequentially provided with a second valve and a third valve along the flow direction of the wastewater, the interface of No. six pipelines and No. one pipeline is located between No. two valves and No. three valves, be equipped with No. four valves on No. six pipelines, be equipped with No. five valves on No. seven pipelines. When the wastewater treatment process is intermittent treatment, the method is divided into three conditions: directly feeding filtered wastewater into a mixed reaction tank: when the wastewater is introduced, the third valve is closed, the fifth valve is closed, the first valve is opened, the filtered wastewater directly enters the mixed reaction tank, the fifth valve is opened after the reaction, and the third valve is opened for circulation when water flows out of the mixed reaction tank or the slurry buffer tank to the pump; secondly, the filtered wastewater enters the mixed reaction tank through the surface renewing device: in the treatment process, the third valve is always kept in an open state, and the first valve is closed; thirdly, after the filtered wastewater is shunted, one part of the filtered wastewater enters the mixed reaction tank through the surface updating device, and the other part of the filtered wastewater directly enters the mixed reaction tank: when the wastewater is introduced, the opening degrees of the first valve and the third valve are adjusted according to the split ratio, and when water flows out of the mixed reaction tank or the slurry buffer tank to the pump, the third valve is completely opened for circulation. When the wastewater treatment process is continuous treatment, the third valve is required to be opened all the time, and only in the second case and the third case, only in the third case, the opening of the third valve is not adjusted any more.
The system also comprises a reactant adding device for supplementing zero-valent iron materials to the mixing reaction tank.
A processing method based on the system comprises the following steps: the method comprises the steps that wastewater firstly enters a filtering device to remove suspended matters and fiber substances in the wastewater, the filtered wastewater selectively enters a mixed reaction tank through a surface updating device after yielding water and/or directly enters the mixed reaction tank, the mixed reaction tank contains zero-valent iron materials, the wastewater and the zero-valent iron materials are fully mixed in the mixed reaction tank for reaction, a part of the reacted wastewater effluent is divided and then enters a precipitation separation tank for separation, a part of the reacted wastewater effluent enters the surface updating device for circulation, supernatant obtained in the precipitation separation tank is used as treated wastewater effluent, and obtained concentrated solid slurry enters a slurry buffer tank and then is sent to the surface updating device for circulation.
In the surface updating device, the linear speed of the stirring shaft is 1-3.5 m/s, when the linear speed of the stirring shaft is too low, the surface updating effect is poor, and when the linear speed of the stirring shaft is too high, the energy consumption of the system is too high.
In the surface renewing device, the hydraulic retention time of wastewater in a cavity is 5-3000 min, when the retention time is less than 5min, the renewing effect is not generated, and when the retention time is more than 3000min, the wastewater treatment efficiency is low.
In the surface renewal device, the filling amount of the zero-valent iron material is 0-10% of the total volume of the chamber, and the zero-valent iron material can be added in advance or supplemented by concentrated solid slurry.
In the mixed reaction tank, the concentration of the zero-valent iron material is 0-10 g/L.
The pH value of the inlet water of the whole system is not less than 4.
The sedimentation separation tank adopts gravity sedimentation to realize the separation of the treated wastewater and solid particles.
The invention has the beneficial effects that:
(1) when the zero-valent iron is used for treating wastewater, the reaction with pollutants in water belongs to a solid-liquid interface process, and the surface updating device can remove an oxide film on the surface of the zero-valent iron and continuously provide a fresh surface area for the zero-valent iron material.
(2) The high activity reaction surface of the zero-valent iron material is maintained, so that the reaction activity of the zero-valent iron material and pollutants in the wastewater is ensured, and the material failure caused by surface passivation is reduced.
(3) The high-efficiency utilization of zero-valent iron materials is realized, the reaction effect is improved, and the high-efficiency removal of pollutants is realized.
(4) The treatment effect of the wastewater can be adjusted by adjusting the operation parameters of the surface renewal device, and the like.
Drawings
FIG. 1 is a schematic view of a wastewater treatment system coupled to a surface renewal device;
FIG. 2 is a schematic structural diagram of a surface renewal device;
FIG. 3 is a wastewater treatment system employed in comparative example 1;
FIG. 4 is a graph showing the results of treating nickel-containing wastewater in example 1 and comparative example 1.
In the figure: 1-a filtration device; 2-a surface renewal device; 201-a motor; 202-a transmitter; 203-a stirring shaft; 204-a chamber; 205-surface renewal auxiliary medium; 206-a housing; 207-zero valent iron material; 3-a mixed reaction tank; 301-a stirrer; 4-a sedimentation separation tank; 5-slurry buffer pool; 6-a reactant feeding device; 7-a pump; 801-overrunning tube; a pipeline No. 802-; 803-pipeline No. two; 804-pipe number three; 805-pipe number four; 806-pipeline five; 807-number six pipe; 808-seventh pipeline; 901-valve number one; 902-valve number two; 903-valve III; 904-valve number four; 905-five valves.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The utility model provides a zero-valent iron effluent disposal system of coupling surface updating device, including filter equipment, the surface updating device, it has the mixed reaction tank of zero-valent iron material to fill, the sedimentation separation pond, the slurry buffer tank and throw the feeder apparatus to the reactant of mixing the reaction tank and replenishing zero-valent iron material, filter equipment locates the upstream, communicate with surface updating device and mixed reaction tank each other respectively, the surface updating device, mix the reaction tank, sedimentation separation tank and slurry buffer tank set gradually and communicate and form the major cycle return circuit, communicate and form the minor cycle return circuit between mixed reaction tank and the surface updating device. The filter device selects one or more of a tubular filter, a sand filter, an active carbon filter or a fiber filter, a stirrer is arranged in the mixed reaction tank, a selective stirring module is arranged in the slurry buffer tank, a pump is arranged between the slurry buffer tank and the surface updating device, and the pump is also communicated with the mixed reaction tank. The zero-valent iron material is selected from one or more of simple substance iron powder, reduced iron powder, cast iron powder, raw iron powder or iron shavings.
The surface updating device comprises a shell, a power mechanism and a stirring shaft in transmission connection with the power mechanism, a cavity is arranged in the shell, the power mechanism is located outside the shell, the power mechanism comprises a motor and a transmitter in transmission connection with the motor, the transmitter is in transmission connection with the stirring shaft, the stirring shaft is located in the cavity, a surface updating auxiliary medium and a zero-valent iron material are filled in the cavity, the surface updating auxiliary medium adopts zirconia balls or iron balls, the particle size of the surface updating auxiliary medium is 0.2-10 mm, and the filling amount of the surface updating auxiliary medium is 60-90%.
Be equipped with between filter equipment and the mixed reaction tank and surmount the pipe, be equipped with the pipeline No. one between filter equipment and the surface renewal device, be equipped with the pipeline No. two between surface renewal device and the mixed reaction tank, be equipped with the pipeline No. three between mixed reaction tank and the sedimentation tank, be equipped with the pipeline No. four between sedimentation tank and the slurry buffer pool, be equipped with the pipeline No. five between slurry buffer pool and the pump, be equipped with the pipeline No. six between pump and the pipeline No. one, be equipped with the pipeline No. seven between pump and the mixed reaction tank, surmount and be equipped with the valve No. one on the pipe, be equipped with the valve No. two valves and No. three valves along the flow direction of waste water on the pipeline No. one in proper order, the interface of pipeline No. six and pipeline is located between valve No. two and the valve No. three valves, be equipped.
A processing method based on the system comprises the following steps: the wastewater firstly enters a filtering device to remove suspended matters and fiber substances in the wastewater, the filtered wastewater is selectively fed into a mixed reaction tank through a surface updating device after yielding water and/or directly fed into the mixed reaction tank, the mixed reaction tank contains zero-valent iron materials, the wastewater and the zero-valent iron materials are fully mixed in the mixed reaction tank for reaction, part of the reacted wastewater is split and fed into a precipitation separation tank for separation, part of the reacted wastewater enters a surface updating device for circulation, supernatant obtained in the precipitation separation tank is taken as treated wastewater to flow out of a system, and the obtained concentrated solid slurry enters a slurry buffer tank and then is fed into the surface updating device for circulation. The pH value of the inlet water of the whole system is not less than 4. In the surface renewing device, the linear speed of a stirring shaft is 1-3.5 m/s, the hydraulic retention time of wastewater in a cavity is 5-3000 min, and the filling amount of a zero-valent iron material is 0-10% of the total volume of the cavity; in the mixed reaction tank, the concentration of the zero-valent iron material is 0-10 g/L.
Example 1
As shown in figure 1, a zero-valent iron wastewater treatment system coupled with a surface renewing device comprises a filtering device 1, a surface renewing device 2, a mixed reaction tank 3 filled with zero-valent iron materials, a precipitation separation tank 4, a slurry buffer tank 5, a pump 7 (adopting a lift pump) and a reactant adding device 6, wherein the filtering device 1 is arranged at the upstream and is respectively communicated with the surface renewing device 2 and the mixed reaction tank 3, the surface renewing device 2, the mixed reaction tank 3, the precipitation separation tank 4, the slurry buffer tank 5 and the pump 7 are sequentially arranged and communicated to form a large circulation loop, the mixed reaction tank 3, the pump 7 and the surface renewing device 2 are communicated to form a small circulation loop, the reactant adding device 6 is only communicated with the mixed reaction tank 3, the filtering device 1 selects one or more of a tubular filter, a sand filter, an activated carbon filter or a fiber filter, a stirrer 301 is arranged in the mixed reaction tank 3, a selective stirring module is arranged in the slurry buffer pool 5, an overrun pipe 801 is arranged between the filtering device 1 and the mixing reaction pool 3, a first pipeline 802 is arranged between the filtering device 1 and the surface updating device 2, a second pipeline 803 is arranged between the surface updating device 2 and the mixing reaction pool 3, a third pipeline 804 is arranged between the mixing reaction pool 3 and the precipitation separation pool 4, a fourth pipeline 805 is arranged between the precipitation separation pool 4 and the slurry buffer pool 5, a fifth pipeline 806 is arranged between the slurry buffer pool 5 and the pump 7, a sixth pipeline 807 is arranged between the pump 7 and the first pipeline 802, a seventh pipeline 808 is arranged between the pump 7 and the mixing reaction pool 3, a first valve 901 is arranged on the overrun pipe 801, a second valve 902 and a third valve 903 are sequentially arranged on the first pipeline 802 along the flow direction of wastewater, and the interface of the sixth pipeline 807 and the first pipeline 802 is positioned between the second valve 902 and the third valve 903, no. six pipelines 807 are provided with a No. four valve 904, and No. seven pipelines 808 are provided with a No. five valve 905.
As shown in fig. 2 (the left figure is an overall view of the surface renewal device, and the right figure is an enlarged view of a partial position in the chamber), the surface renewal device 2 comprises a housing 206, a motor 201, a transmitter 202 in transmission connection with the motor 201, and a stirring shaft 203 in transmission connection with the transmitter 202, a chamber 204 is arranged in the housing 206, the motor 201 and the transmitter 202 are both positioned outside the housing 206, the stirring shaft 203 is positioned in the chamber 204, the chamber 204 is filled with a surface renewal auxiliary medium 205 and a zero-valent iron material 207 (the zero-valent iron material in the right drawing of fig. 2 is granular), the surface renewal auxiliary medium 205 is zirconia balls or iron balls, the particle size of the surface renewal auxiliary medium 205 is between 0.2mm and 10mm, the filling amount of the surface renewal auxiliary medium 205 is 60-90%, and the zero-valent iron material 207 is selected from one or more mixtures of simple substance iron powder, reduced iron powder, cast iron powder, raw iron powder or iron shavings.
A treatment method based on the wastewater treatment system comprises the following steps: the wastewater firstly enters a filtering device 1 to remove suspended matters and fiber substances in the wastewater, the filtered wastewater is selectively fed into a mixed reaction tank 3 through a surface renewal device 2 after yielding water and/or directly fed into the mixed reaction tank 3, the mixed reaction tank 3 contains zero-valent iron materials, the wastewater and the zero-valent iron materials are fully mixed in the mixed reaction tank 3 for reaction, a part of the reacted wastewater is split and fed into a precipitation separation tank 4 for separation, a part of the reacted wastewater enters the surface renewal device 2 for circulation, supernatant obtained in the precipitation separation tank 4 is taken as treated wastewater to flow out of a system, and the obtained concentrated solid slurry enters a slurry buffer tank 5 and then is fed into the surface renewal device 2 for circulation.
The embodiment specifically includes: the system and the method are adopted to treat 5000mL of nickel-containing wastewater with the nickel ion concentration of 1000mg/L, the pH value of the nickel-containing wastewater is 4.7, the concentration of Suspended Solid (SS) is 100mg/L, 20g of simple substance iron powder (micron-sized) is taken as a zero-valent iron material, the particle size is 8 mu m, the material is filled in the surface updating device 2, and meanwhile, the parameters of the surface updating device 2 are as follows: the linear velocity of the stirring shaft 203 is 3.14m/s, the surface updating auxiliary medium 205 is zirconia balls with the grain diameter of 0.2mm, the filling amount of the zirconia balls is 80 percent of the total volume of the chamber 204, and the retention time of the wastewater is 10 min. The method comprises the following specific steps:
after nickel-containing wastewater is filtered by a filtering device 1 (adopting activated carbon for filtration), the concentration of Suspended Solid (SS) is reduced from 100mg/L to 20mg/L and then directly enters a mixed reaction tank 3, 20g of elemental iron powder is added into the mixed reaction tank 3 by a reactant adding device 6, the rotation speed of a stirrer is 500rpm, the wastewater and micron iron powder are fully mixed and reacted in the mixed reaction tank 3, part of effluent after reaction enters a precipitation separation tank 4 for gravity settling, the other part of effluent is directly pumped into a surface renewal device 2 by a pump 7 for circulation (the flow distribution ratio is limited by controlling the flow velocity of a fourth pipeline 805), the flow velocity of the fourth pipeline 805 is controlled to be not less than 1m/s in the flow distribution process, supernatant in the precipitation separation tank 4 is taken as treated wastewater to flow out of a system, concentrated solid slurry enters a slurry buffer tank 5 and is sent to the surface renewal device 2 by the pump 7 for circulation, the water discharged from the surface renewing device 2 enters a mixing reaction tank 3 to be mixed and reacted with the waste water and the micron iron powder, and then the operations are repeated.
The nickel ion concentration of the water sample discharged from the precipitation separation tank 4 at the time points of 0h, 0.5h, 1h, 2h, 3h, 4h, 5h and 6h is measured, and the result is shown in fig. 4. The result shows that the concentration of nickel ions is reduced to 220mg/L from the initial 1000mg/L, and the removal amount of the nickel ions in the nickel ion wastewater can reach 780mg/L by adopting the wastewater treatment system of the coupling surface updating device.
Comparative example 1
The wastewater treatment system shown in FIG. 3 was used, and the parameters, flow and the like were the same as those in example 1 except that the surface renewal apparatus was not used and only simple mechanical stirring was carried out using a mechanical stirring reactor. The nickel ion concentration in the precipitation separation tank 4 was measured by taking water samples at time points of 0h, 0.5h, 1h, 2h, 3h, 4h, 5h, and 6h, respectively, and the results are shown in fig. 4. The results show that only a small amount of nickel ions can be removed by simple mechanical stirring without using a surface renewal device, and the concentration of the nickel ions in the nickel-containing wastewater is reduced from the initial 1000mg/L to 865mg/L, namely, the removal amount is only 135 mg/L.
Comparing example 1 with comparative example 1, it can be seen that there is a significant difference between the treatment effect of the nickel ion solution by coupling the surface renewal device in the wastewater treatment system and by performing only simple mechanical agitation, and the treatment efficiency of the nickel ion wastewater can be greatly improved by coupling the surface renewal device in the wastewater treatment system.
Example 2
In actual operation, in addition to the operation parameters of the surface renewal device, the wastewater treatment system coupled with the surface renewal device is used for wastewater treatment, wherein the wastewater is nickel-containing wastewater with the nickel ion concentration of 1000mg/L and the volume of 5000 mL: the linear velocity of the stirring shaft is 3.5m/s, zirconia balls with the particle size of 10mm are adopted as the surface updating auxiliary medium, the filling amount of the zirconia balls is 60%, and the rest parameters and the wastewater treatment flow are the same as those in the embodiment 1 except that the wastewater retention time is 5 min. The nickel ion concentration of the effluent from the precipitation separation tank 4 after 6h treatment was determined and the result showed that the nickel ion concentration was reduced from the initial 1000mg/L to 565mg/L, i.e. the removal was 435 mg/L.
Example 3
In actual operation, in addition to the operation parameters of the surface renewal device, the wastewater treatment system coupled with the surface renewal device is used for wastewater treatment, wherein the wastewater is nickel-containing wastewater with the nickel ion concentration of 1000mg/L and the volume of 5000 mL: the linear velocity of the stirring shaft is 1m/s, the surface renewal auxiliary medium adopts zirconia balls with the grain diameter of 0.2mm, the filling amount of the zirconia balls is 90 percent, and the rest parameters and the wastewater treatment flow are the same as those in the embodiment 1 except that the retention time of wastewater is 3000 min. The nickel ion concentration of the effluent from the precipitation separation tank 4 after 6 hours of treatment was measured and showed that the nickel ion concentration was reduced from the initial 1000mg/L to 187mg/L, i.e., the removal amount was 813 mg/L.
Comparing examples 1, 2, and 3, it was found that the removal rate of nickel ions can be adjusted by adjusting parameters in the surface renewal apparatus.
Example 4
The wastewater treatment system coupled with the surface renewal device is used for wastewater treatment, the wastewater is nickel-containing wastewater with the nickel ion concentration of 1000mg/L and the volume of 5000mL, and in the actual operation, the rest parameters and the wastewater treatment flow are the same as those of the embodiment 1 except that the nickel-containing wastewater passes through the filtering device 1 (adopting activated carbon for filtration), then passes through the surface renewal device 2 and then enters the mixed reaction tank 3. The nickel ion concentration of the effluent of the precipitation separation tank 4 after 6 hours of treatment is measured, and the result shows that the nickel ion concentration is reduced from the initial 1000mg/L to 248mg/L, namely the removal amount is 752 mg/L.
Example 5
In the actual operation, the wastewater treatment system coupled with the surface renewing apparatus is used for wastewater treatment, the wastewater is nickel-containing wastewater with a nickel ion concentration of 1000mg/L and a volume of 5000L, and the rest parameters and wastewater treatment flow are the same as those of example 1 except that after the nickel-containing wastewater passes through the filtering apparatus 1 (adopting activated carbon for filtering), the wastewater is divided into the surface renewing apparatus 2 and the mixing reaction tank 3 (the flow rate of the second pipeline 803 is controlled to limit the flow rate), and the flow rate of the second pipeline 803 is controlled to be 50L/s. The nickel ion concentration of the effluent of the precipitation separation tank 4 after 6 hours of treatment was measured, and the result showed that the nickel ion concentration was reduced from the initial 1000mg/L to 173mg/L, i.e., the removal amount was 827 mg/L.
Example 6
The wastewater treatment system based on the coupling surface updating device in example 1 is used for wastewater treatment, the wastewater is chloroform wastewater with chloroform concentration of 10mg/L, the flow rate of the chloroform wastewater is 400mL/h, and in actual operation, except for the difference that 50g of micron iron powder is added into the mixed reaction tank 3 by the reactant adding device 6, the other parameters and the wastewater treatment flow are the same as those in example 1. The chloroform concentration of the effluent of the precipitation separation tank 4 after 50 hours of treatment is measured, and the result shows that the dechlorination efficiency of the chloroform in the chloroform wastewater is 50 percent.
Example 7
The wastewater treatment system coupled with the surface updating device is used for wastewater treatment, the wastewater is nickel-containing wastewater with the nickel ion concentration of 1000mg/L and the volume of 5000mL, and in the actual operation, the parameters and the wastewater treatment process are the same as those in the embodiment 1 except that 20g of reduced iron powder is added into the mixing reaction tank 3 by the reactant adding device 6. The nickel ion concentration of the effluent of the precipitation separation tank 4 after 6 hours of treatment is measured, and the result shows that the nickel ion concentration is reduced from the initial 1000mg/L to 354mg/L, namely the removal amount is 646 mg/L.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The zero-valent iron wastewater treatment system coupled with the surface updating device is characterized by comprising a filtering device (1), the surface updating device (2), a mixed reaction tank (3) filled with a zero-valent iron material, a precipitation separation tank (4) and a slurry buffer tank (5), wherein the filtering device (1) is arranged at the upstream and is respectively communicated with the surface updating device (2) and the mixed reaction tank (3), the surface updating device (2), the mixed reaction tank (3), the precipitation separation tank (4) and the slurry buffer tank (5) are sequentially arranged and communicated to form a large circulation loop, a small circulation loop is formed by communicating the mixed reaction tank (3) and the surface updating device (2), the surface updating device (2) comprises a shell (206), a power mechanism and a stirring shaft (203) in transmission connection with the power mechanism, a cavity (204) is arranged in the shell (206), the power mechanism is located outside the shell (206), the stirring shaft (203) is located in the cavity (204), and the cavity (204) is filled with a surface updating auxiliary medium (205) and a zero-valent iron material.
2. The zero-valent iron wastewater treatment system coupled with the surface renewal device, according to claim 1, wherein the power mechanism comprises a motor (201) and a transmitter (202) in transmission connection with the motor (201), and the transmitter (202) is in transmission connection with the stirring shaft (203).
3. The zero-valent iron wastewater treatment system coupled with the surface renewal device according to claim 1, wherein the surface renewal auxiliary medium (205) is zirconia balls or iron balls, the particle size of the surface renewal auxiliary medium (205) is between 0.2mm and 10mm, and the filling amount of the surface renewal auxiliary medium (205) is between 60 mm and 90%.
4. The zero-valent iron wastewater treatment system coupled with a surface renewal device of claim 1, wherein the zero-valent iron material is selected from one or more mixtures of elemental iron powder, reduced iron powder, cast iron powder, raw iron powder or iron shavings.
5. The zero-valent iron wastewater treatment system coupled with a surface renewal device of claim 1, wherein the filtration device (1) selects one or more of a tube filter, a sand filter, an activated carbon filter or a fiber filter;
a stirrer (301) is arranged in the mixing reaction tank (3);
and a selective stirring module is arranged in the slurry buffer tank (5).
6. The zero-valent iron wastewater treatment system coupled with the surface renewal device according to claim 1, wherein a pump (7) is arranged between the slurry buffer tank (5) and the surface renewal device (2), and the pump (7) is also communicated with the mixing reaction tank (3).
7. The zero-valent iron wastewater treatment system coupled with the surface renewal device, according to claim 6, wherein an overtaking pipe (801) is arranged between the filtering device (1) and the mixing reaction tank (3), a first pipeline (802) is arranged between the filtering device (1) and the surface renewal device (2), a second pipeline (803) is arranged between the surface renewal device (2) and the mixing reaction tank (3), a third pipeline (804) is arranged between the mixing reaction tank (3) and the precipitation separation tank (4), a fourth pipeline (805) is arranged between the precipitation separation tank (4) and the slurry buffer tank (5), a fifth pipeline (806) is arranged between the slurry buffer tank (5) and the pump (7), a sixth pipeline (807) is arranged between the pump (7) and the first pipeline (802), and a seventh pipeline (808) is arranged between the pump (7) and the mixing reaction tank (3), the overrunning pipe (801) is provided with a first valve (901), the first pipeline (802) is sequentially provided with a second valve (902) and a third valve (903) along the flow direction of wastewater, the interface of the sixth pipeline (807) and the first pipeline (802) is positioned between the second valve (902) and the third valve (903), the sixth pipeline (807) is provided with a fourth valve (904), and the seventh pipeline (808) is provided with a fifth valve (905).
8. The zero-valent iron wastewater treatment system coupled with the surface renewal device according to claim 1, further comprising a reactant dosing device (6) for supplementing zero-valent iron material to the mixing reaction tank (3).
9. A processing method based on the system according to any one of claims 1 to 8, characterized in that the steps of the processing method are specifically: the method comprises the steps that wastewater firstly enters a filtering device (1) to remove suspended matters and fiber substances in the wastewater, the filtered wastewater is discharged and then selectively enters a mixed reaction tank (3) through a surface updating device (2) and/or directly enters the mixed reaction tank (3), the mixed reaction tank (3) contains zero-valent iron materials, the wastewater and the zero-valent iron materials are fully mixed in the mixed reaction tank (3) to react, a part of the reacted wastewater is discharged and shunted and then enters a precipitation separation tank (4) to be separated, a part of the reacted wastewater enters the surface updating device (2) to be circulated, supernatant obtained in the precipitation separation tank (4) is used as treated wastewater to flow out of a system, and the obtained concentrated solid slurry enters a slurry buffer tank (5) and then is sent to the surface updating device (2) to be circulated.
10. The method for treating the zero-valent iron wastewater treatment system based on the coupling surface renewal device as claimed in claim 9, wherein the pH of the inlet water of the system is not less than 4;
in the surface updating device (2), the linear speed of the stirring shaft (203) is 1-3.5 m/s, and the hydraulic retention time of the wastewater in the chamber (204) is 5-3000 min;
and the sedimentation separation tank (4) realizes separation by adopting gravity sedimentation.
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