CN112499848A - Electric flocculation silicon removal process and system for silicon-containing wastewater - Google Patents
Electric flocculation silicon removal process and system for silicon-containing wastewater Download PDFInfo
- Publication number
- CN112499848A CN112499848A CN202011063029.6A CN202011063029A CN112499848A CN 112499848 A CN112499848 A CN 112499848A CN 202011063029 A CN202011063029 A CN 202011063029A CN 112499848 A CN112499848 A CN 112499848A
- Authority
- CN
- China
- Prior art keywords
- silicon
- tank
- electric flocculation
- water
- sedimentation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to the technical field of silicon-containing wastewater treatment, in particular to an electrocoagulation silicon removal process for silicon-containing wastewater, which comprises the following steps of 1) collecting silicon-containing raw water into a raw water collecting pool, pumping the silicon-containing raw water in the raw water collecting pool into an electrocoagulation device through a gas-liquid mixing pump for electrolytic treatment, and then delivering a water body subjected to electrolytic treatment into a settling pond for standing and layering; 2) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank in the step 1), and sending the supernatant after sedimentation and delamination in the sedimentation tank into an intermediate water tank for secondary sedimentation; 3) and (3) sending the supernatant subjected to secondary sedimentation in the intermediate water tank in the step 2) into a multi-media filter for filtration, and finally desalting the filtered filtrate for recycling. The electric flocculation desiliconization process of the silicon-containing wastewater is simple to operate, does not need to add chemical agents in the treatment process, avoids secondary environmental pollution, has the desiliconization treatment rate of over 99 percent, is suitable for large-scale treatment, and has high practicability.
Description
Technical Field
The invention relates to the technical field of silicon-containing wastewater treatment, in particular to an electric flocculation silicon removal process and system for silicon-containing wastewater.
Background
With the increasing strictness of national environmental protection policies, factory sewage zero discharge becomes necessary, and a zero discharge process is necessary to be matched with a reclaimed water recycling system, reclaimed water recycling is actually to utilize a membrane separation technology to separate harmful substances of wastewater from water, membrane separation is divided into a physical membrane and an ionic membrane, but no matter which type of membrane, the reclaimed water recycling system has certain rigid index ranges for water quality of inlet water, such as conductivity, COD and the like, and if the rigid index ranges exceed the blockage and damage of the easily-caused membrane, the reclaimed water recycling system is seriously paralyzed in a whole line, the method mainly aims at some coal chemical plants, silicon series production enterprises, cloth dyeing factories and the like, because production raw materials or production auxiliary materials contain silicon elements, in the sewage treatment process, because the executed zero discharge standard is adopted, the silicon ions are continuously accumulated in the system and accumulated to a certain degree, the operation of the later-stage membrane is influenced, the discharge of silicon is beyond the standard, when the content of the silicon in sewage is higher than 200mg/l, a formed viscous colloid becomes a super killer of ultrafiltration, reverse osmosis membranes and the like, in order to ensure that a membrane system can normally operate and ensure that water can reach the standard and discharge (generally 80-90 percent of reuse water), a plurality of enterprises adopt electric flocculation to remove silicon in the sewage, and the process of removing the silicon by the electric flocculation is very effective in the effect of removing the silicon, but meets a life bottleneck, namely electrode plate scaling, in the using process. When the scale is formed to a certain degree (the anode and the cathode can be seriously connected together), the electrolytic voltage is increased, the current is not output at all, if no special treatment is carried out, the operation is generally not carried out from the installation to 15 working days, namely, the silicon pollution continues, the reuse of reclaimed water in sewage cannot be carried out, the sewage discharge cannot reach the standard, and the failure of the sewage station to operate means that the production workshop cannot carry out normal production, so enterprises seek a method for practically solving the silicon ion pollution or an effective method and measure for practically operating the electric flocculation.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the electric flocculation silicon removal process for the silicon-containing wastewater, the treatment process is simple to operate, no chemical agent is required to be added in the treatment process, the secondary pollution to the environment is avoided, the silicon removal treatment rate is up to more than 99%, and the process is suitable for large-scale treatment.
The invention aims to provide an electric flocculation silicon removal system for silicon-containing wastewater, which has the advantages of novel structure, simple operation, improved resource reutilization rate of raw water treatment, good solution to the problem of scaling of a plate electrode, no secondary pollution to the environment, high silicon removal treatment rate of over 99 percent and high practicability.
The purpose of the invention is realized by the following technical scheme: an electric flocculation desiliconization process of silicon-containing wastewater, which comprises the following steps:
1) collecting silicon-containing raw water into a raw water collecting pool, pumping the silicon-containing raw water in the raw water collecting pool into a softening device, and removing hardness to ensure that the hardness of the silicon-containing raw water is not higher than 100 mg/L;
2) feeding the water body subjected to hardness removal in the step 1) into an electric flocculation device for electrolysis treatment, and then feeding the water body subjected to electrolysis treatment into a sedimentation tank for standing and layering; the voltage during electrolytic treatment is 22-26v, and the current density is 55-65A/m2The electrolytic treatment time is 20-40 min;
3) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank in the step 2), and sending the supernatant after sedimentation and delamination in the sedimentation tank into an intermediate water tank for secondary sedimentation;
4) and (3) sending the supernatant subjected to secondary sedimentation in the intermediate water tank in the step 3) into a multi-media filter for filtration, and finally desalting the filtered filtrate for recycling.
The electric flocculation desiliconization process of the silicon-containing wastewater is simple to operate, chemical agents do not need to be added in the treatment process, secondary environment pollution is avoided, the desiliconization treatment rate is up to more than 99%, and the method is suitable for large-scale treatment. Wherein, the water entering the electric flocculation device in the step 1) needs to be softened firstly, the alkalinity is required to be less than or equal to 100mg/L, so as to prevent the scaling of the electrode plate, when the electric flocculation is adopted for removing silicon, soluble anode ferrite and the like are utilized, after direct current is applied, electrons are lost extremely to form metal cations, a series of hydrolysis, polymerization and oxidation processes are carried out to form a high-activity flocculation and complexing group, the adsorption capacity is extremely strong, calcium and magnesium ions, silicon and suspended impurities in the water are coagulated, precipitated and separated, simultaneously, charged pollutant particles swim in an electric field, and partial charges are neutralized by the electrode to promote destabilization and coagulation; and a voltage of22-26v, current of 5000-6000A and current density of 55-65A/m2The electrolytic treatment time is 20-40min, so that hydroxides such as calcium, magnesium and the like which are not very compact and are attached to the pole plate can fall off when the anode is dissolved, and enter the next-stage coagulating sedimentation along with liquid to open a way and remove, the problem of scaling of the pole plate is well solved, and secondary pollution without environment is avoided.
The other purpose of the invention is realized by the following technical scheme: an electric flocculation desiliconization system of silicon-containing wastewater is used for implementing the treatment system of the electric flocculation desiliconization process of the silicon-containing wastewater, comprises a raw water collecting tank, an electric flocculation device, a sedimentation tank, an intermediate water tank, a multi-media filter and a desalination treatment tank which are communicated in turn according to the treatment and use sequence, the electric flocculation device comprises a tank body, a rectifier, a gas-liquid mixing device, a plurality of partition plates, a plurality of electrode plates and a plurality of leads, the baffle plates are vertically arranged in the cell body and divide the cell body into a plurality of electrode reaction zones, the electrode plates are vertically arranged in the electrode reaction zones, the outlets of the gas-liquid mixing device are arranged at the bottom in the tank body and are uniformly distributed in the electrode reaction area, the rectifier is arranged on one side of the tank body, the electrode plates are communicated with the rectifier through leads, and the gas-liquid mixing device is arranged on the tank body and a middle pipeline of the raw water collecting tank; furthermore, a strong aeration system is arranged in the electrode area, and the strong aeration system adopts a perforated aeration pipe.
According to the electric flocculation silicon removal system for silicon-containing wastewater, silicon-containing raw water can be collected in a centralized manner in the using process, then the silicon-containing raw water is conveyed to an electric flocculation device by a pump for electrolytic treatment, a water body after electrolytic treatment flows into a sedimentation tank, standing is carried out in a natural state, so that a precipitate is formed at the bottom of the sedimentation tank, supernatant subjected to standing and sedimentation treatment is conveyed to an intermediate water tank for secondary sedimentation, the supernatant subjected to secondary sedimentation is conveyed to a multi-media filter for filtration, filtrate is desalted by a desalting treatment tank and then is recycled, and the resource reutilization rate of raw water treatment is improved; in addition, the sludge discharge port at the bottom of the sedimentation tank is opened, the sediment at the lower layer is discharged through the sludge discharge port, post-treatment such as filter pressing is carried out, and then the filter-pressed mud cakes are subjected to outsourcing treatment, so that the effective treatment of sludge waste is realized, and the pollution to the environment is avoided. The water body is treated by the electric flocculation device, the voltage and the current of an electrolytic polar plate are controlled by a rectifier, so that the whole electrolytic treatment process is controlled, meanwhile, the additionally arranged gas-liquid mixing device can enable liquid in the tank to move quickly, a strong aeration system is arranged at an electrode area, silicon oxide generated in an anode area is convenient to diffuse quickly, the silicon oxide is not accumulated in the electrode area, silicon ions far away from the polar plate are promoted to be supplemented to the periphery of the polar plate quickly, or generated iron (aluminum) ions are diffused to a far position quickly to form a copolymer with the silicon ions, so that the silicon ions can be effectively reduced to a design range in a short retention time, and meanwhile, the local saturated crystallization condition of aluminum or iron is also solved; in addition, the measure can also reduce the probability of the formed hydroxides such as calcium, magnesium and the like being attached to the electrode plate, and can wash the attached substances by proper gas stirring to make the substances fall off, thereby being convenient to operate and easy to control, and improving the electrolytic treatment efficiency and effect.
Preferably, the electric flocculation device also comprises a water distribution tank arranged at the bottom in the tank body; the upper end of the clapboard is provided with an overflow port which penetrates through the clapboard. The electric flocculation device is provided with four electrode reaction zones, the flow direction of water in each electrode reaction zone is from top to bottom, a water outlet section is provided with a water distribution runner, and the water distribution runner is communicated with the water distribution groove.
In the invention, liquid in the first-stage electrode reaction zone above two adjacent electrode reaction zones overflows through the overflow port at the upper end of the partition plate, then is drained into the water distribution tank at the lower part, flows out from bottom to top, and then is drained into the next-stage electrode reaction zone from the overflow port overflow tank at the upper end of the other partition plate, so that the electrolytic reaction efficiency of the electric flocculation device can be obviously improved, the problem that the effluent cannot reach the standard due to the short circuit of water flow is prevented, and meanwhile, the electrode reaction zones are set to be in a four-stage baffling mode, so that the water can be ensured to flow through each.
Preferably, the plurality of electrode plates are uniformly arranged in the cell body, and the plate distance between every two adjacent electrode plates is 5-6 cm.
The invention needs to strictly control the plate spacing between two adjacent electrode plates to be 5-6cm, is beneficial to the flow circulation of solution, and can solve the problems that the former electrode plate spacing is too small, and aluminum hydroxide precipitates filled between the electrode plates after electrolysis are easy to attach to the periphery of the electrode plates, and can cause short circuit in serious cases.
Preferably, the electrode plate is an aluminum plate or an iron plate, the electrode plate comprises a positive plate and a negative plate, and the time interval of automatic switching of the positive plate and the negative plate is less than or equal to 5 min.
In order to avoid passivation of the electrode plate and prevent scaling, the time interval for automatically switching the positive electrode and the negative electrode for reversing is set in the electric flocculation device to be less than or equal to 5min, so that the scaling phenomenon of the conventional electrode plate can be effectively solved.
Preferably, the gas-liquid mixing device adopts a gas-liquid mixing pump, and the liquid-gas ratio is 1-2: 9.
The gas quantity of the gas-liquid mixing device needs to be strictly controlled to be 0.14-0.18m3The pressure is 0.18-0.22MPa, which can make the liquid in the tank body move quickly, and make the silicon ion far away from the polar plate supplement to the periphery of the polar plate quickly, or make the iron (aluminum) ion diffuse to far away to form copolymer with the silicon ion, and can effectively reduce the silicon ion to the designed range in short retention time, and at the same time, the local saturated crystallization condition of aluminum or iron can be solved, in addition, the probability of the formed hydroxide of calcium, magnesium and the like attached to the polar plate can be reduced, and proper gas stirring can also wash the attached substance to make it fall off.
Preferably, the four electrode reaction areas adopt a down-flow mode, the water level of two adjacent electrode reaction areas is reduced by 8-12cm, and the water distribution groove of each corresponding electrode reaction area is simultaneously reduced by 8-12 cm.
In the invention, in order to ensure that the residence time of each electrode reaction area is the same, the four electrode reaction areas are designed into a down-flow mode, the water level of each stage of electrode reaction area is reduced by 8-12cm, the water distribution area (water distribution tank) at the lower part of the electrode reaction area is simultaneously reduced by 8-12cm, and the reaction time of the electrode plates is controlled to be the same, thereby ensuring the high efficiency of electrolysis.
The invention has the beneficial effects that: the electric flocculation desiliconization process of the silicon-containing wastewater is simple to operate, does not need to add chemical agents in the treatment process, avoids secondary environmental pollution, has the desiliconization treatment rate of over 99 percent, and is suitable for large-scale treatment.
The electric flocculation silicon removal system for silicon-containing wastewater disclosed by the invention is novel in structure and simple to operate, improves the resource reutilization rate of raw water treatment, well solves the problem of scaling of a plate electrode, avoids secondary pollution to the environment, and is high in silicon removal treatment rate up to more than 99% and high in practicability.
Drawings
FIG. 1 is a schematic structural diagram of an electric flocculation silicon removal system of the present invention;
FIG. 2 is a top view of an electroflocculation apparatus of the present invention;
FIG. 3 is an exploded schematic view of an electric flocculation apparatus of the present invention;
fig. 4 is a cross-sectional view of an electroflocculation apparatus of the present invention.
The reference signs are: 1-a raw water collecting tank, 2-an electric flocculation device, 21-a tank body, 22-a rectifier, 23-a gas-liquid mixing device, 24-an aeration pipe, 25-a partition plate, 251-an overflow port, 26-an electrode plate, 27-a lead, 28-a water distribution tank, 3-a sedimentation tank, 4-an intermediate water tank, 5-a multi-media filter, 6-a desalination treatment tank and 7-a softening device.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying fig. 1-4, which are not intended to limit the present invention.
Example 1
1) Collecting raw water containing silicon into a raw water collecting pool 1, pumping the raw water containing silicon in the raw water collecting pool 1 into a softening device 7, and removing hardness to ensure that the hardness of the raw water containing silicon is not higher than 100 mg/L;
2) feeding the water body with hardness removed in the step 1) into an electric flocculation device 2 for electrolysis treatment, and then feeding the water body after electrolysis treatment into a sedimentation tank 3 for standing and layering; the voltage during the electrolytic treatment was 22v, and the current density was 55A/m2The electrolytic treatment time is 20 min;
3) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank 3 in the step 2), and sending the upper layer clear liquid after sedimentation and delamination in the sedimentation tank 3 into the intermediate water tank 4 for secondary sedimentation;
4) and (3) sending the supernatant subjected to secondary sedimentation in the intermediate water tank 4 in the step 3) into a multi-media filter 5 for filtration, and finally desalting the filtered filtrate for recycling.
Referring to fig. 1-4, an electrocoagulation silicon removal system for silicon-containing wastewater, which is a treatment system for implementing the above-mentioned electrocoagulation silicon removal process for silicon-containing wastewater, and comprises a raw water collection tank 1, an electrocoagulation device 2, a sedimentation tank 3, an intermediate water tank 4, a multi-media filter 5 and a desalination treatment tank 5 which are sequentially communicated according to a treatment use order, wherein the electrocoagulation device 2 comprises a tank body 21, a rectifier 22, a gas-liquid mixing device 23, an aeration pipe 24, a plurality of partition plates 25, a plurality of electrode plates 26 and a plurality of leads 27, the partition plates 25 are vertically arranged in the tank body 21 and divide the interior of the tank body 21 into a plurality of electrode reaction zones, the electrode plates 26 are vertically arranged in the electrode reaction zones, outlets of the gas-liquid mixing device 23 are arranged at the bottom of the tank body 21 and uniformly distributed in the electrode reaction zones, the rectifier 22 is arranged at one side, the electrode plates 26 are communicated with the rectifier 22 through leads 27, and the gas-liquid mixing device 23 is arranged on the middle pipelines of the tank body 21 and the raw water collecting tank 1; further, a strong aeration system using perforated aeration tubes 24 is disposed in the electrode zone.
The electric flocculation device 2 is provided with four electrode reaction zones, the flow direction of water in each electrode reaction zone is from top to bottom, and a water outlet section is provided with a water distribution channel (not shown), and the water distribution channel is communicated with the water distribution tank 28.
The plurality of electrode plates 26 are uniformly arranged in the tank body 21, and the plate interval between every two adjacent electrode plates 26 is 5 cm.
The electrode plate 26 is made of an aluminum plate or an iron plate; the electrode plate 26 comprises a positive plate and a negative plate, and the time interval of automatic switching of the positive plate and the negative plate is less than or equal to 5 min.
The gas isThe liquid mixing device 23 adopts a gas-liquid mixing pump, the liquid-gas ratio is 1-2:9, and the gas quantity is 0.14m3Min, air pressure 0.18 MPa.
The four electrode reaction areas adopt a down-flow mode, the water level of two adjacent electrode reaction areas is reduced by 8cm, and the water distribution groove 28 of each corresponding electrode reaction area is simultaneously reduced by 8 cm.
Example 2
An electric flocculation desiliconization process of silicon-containing wastewater, which comprises the following steps:
1) collecting raw water containing silicon into a raw water collecting pool 1, pumping the raw water containing silicon in the raw water collecting pool 1 into a softening device 7, and removing hardness to ensure that the hardness of the raw water containing silicon is not higher than 100 mg/L;
2) feeding the water body with hardness removed in the step 1) into an electric flocculation device 2 for electrolysis treatment, and then feeding the water body after electrolysis treatment into a sedimentation tank 3 for standing and layering; the voltage during the electrolytic treatment was 23v, and the current density was 58A/m2The electrolytic treatment time is 25 min;
3) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank 3 in the step 2), and sending the upper layer clear liquid after sedimentation and delamination in the sedimentation tank 3 into the intermediate water tank 4 for secondary sedimentation;
4) and (3) sending the supernatant subjected to secondary sedimentation in the intermediate water tank 4 in the step 3) into a multi-media filter 5 for filtration, and finally desalting the filtered filtrate for recycling.
An electrocoagulation silicon-removing system for silicon-containing wastewater, which is used for implementing the treatment system of the electrocoagulation silicon-removing process for silicon-containing wastewater, and comprises a raw water collecting tank 1, an electrocoagulation device 2, a sedimentation tank 3, an intermediate water tank 4, a multi-media filter 5 and a desalination treatment tank 5 which are sequentially communicated according to the treatment use sequence, wherein the electrocoagulation device 2 comprises a tank body 21, a rectifier 22, a gas-liquid mixing device 23, an aeration pipe 24, a plurality of partition plates 25, a plurality of electrode plates 26 and a plurality of leads 27, the partition plates 25 are vertically arranged in the tank body 21 and divide the tank body 21 into a plurality of electrode reaction zones, the electrode plates 26 are vertically arranged in the electrode reaction zones, outlets of the gas-liquid mixing device 23 are arranged at the bottom in the tank body 21 and are uniformly distributed in the electrode reaction zones, the rectifier 22 is arranged at one side of the tank body 21, and the electrode plates 26 are communicated with the rectifier 22 through, the gas-liquid mixing device 23 is arranged on the middle pipeline of the tank body 21 and the raw water collecting tank 1; further, a strong aeration system using perforated aeration tubes 24 is disposed in the electrode zone.
The electric flocculation device 2 also comprises a water distribution tank 28 arranged at the bottom in the tank body 21; the upper end of the partition 25 is provided with an overflow opening 251 which penetrates through the partition 25.
The electric flocculation device 2 is provided with four electrode reaction zones, the flow direction of water in each electrode reaction zone is from top to bottom, a water outlet section is provided with a water distribution channel, and the water distribution channel is communicated with the water distribution tank 28.
The electrode plates 26 are uniformly arranged in the groove body 21, and the plate distance between every two adjacent electrode plates 26 is 5.25 cm.
The plurality of electrode plates 26 are made of aluminum plates or iron plates; the electrode plate 26 comprises a positive plate and a negative plate, and the time interval of automatic switching of the positive plate and the negative plate is less than or equal to 5 min.
The gas-liquid mixing device 23 adopts a gas-liquid mixing pump, the liquid-gas ratio is 1-2:9, and the gas quantity is 0.15m3Min, air pressure 0.19 MPa.
The four electrode reaction areas adopt a down-flow mode, the water level of two adjacent electrode reaction areas is reduced by 9cm, and the water distribution groove 28 of each corresponding electrode reaction area is simultaneously reduced by 9 cm.
Example 3
An electric flocculation desiliconization process of silicon-containing wastewater, which comprises the following steps:
1) collecting raw water containing silicon into a raw water collecting pool 1, pumping the raw water containing silicon in the raw water collecting pool 1 into a softening device 7, and removing hardness to ensure that the hardness of the raw water containing silicon is not higher than 100 mg/L;
2) feeding the water body with hardness removed in the step 1) into an electric flocculation device 2 for electrolysis treatment, and then feeding the water body after electrolysis treatment into a sedimentation tank 3 for standing and layering; the voltage during the electrolytic treatment was 24v, and the current density was 605A/m2The electrolytic treatment time is 30 min;
3) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank 3 in the step 2), and sending the upper layer clear liquid after sedimentation and delamination in the sedimentation tank 3 into the intermediate water tank 4 for secondary sedimentation;
4) and (3) sending the supernatant subjected to secondary sedimentation in the intermediate water tank 4 in the step 3) into a multi-media filter 5 for filtration, and finally desalting the filtered filtrate for recycling.
An electrocoagulation silicon-removing system for silicon-containing wastewater, which is used for implementing the treatment system of the electrocoagulation silicon-removing process for silicon-containing wastewater, and comprises a raw water collecting tank 1, an electrocoagulation device 2, a sedimentation tank 3, an intermediate water tank 4, a multi-media filter 5 and a desalination treatment tank 5 which are sequentially communicated according to the treatment use sequence, wherein the electrocoagulation device 2 comprises a tank body 21, a rectifier 22, a gas-liquid mixing device 23, an aeration pipe 24, a plurality of partition plates 25, a plurality of electrode plates 26 and a plurality of leads 27, the partition plates 25 are vertically arranged in the tank body 21 and divide the tank body 21 into a plurality of electrode reaction zones, the electrode plates 26 are vertically arranged in the electrode reaction zones, outlets of the gas-liquid mixing device 23 are arranged at the bottom in the tank body 21 and are uniformly distributed in the electrode reaction zones, the rectifier 22 is arranged at one side of the tank body 21, and the electrode plates 26 are communicated with the rectifier 22 through, the gas-liquid mixing device 23 is arranged on the middle pipeline of the tank body 21 and the raw water collecting tank 1; further, a strong aeration system using perforated aeration tubes 24 is disposed in the electrode zone.
The electric flocculation device 2 also comprises a water distribution tank 28 arranged at the bottom in the tank body 21; the upper end of the partition 25 is provided with an overflow opening 251 which penetrates through the partition 25.
The electric flocculation device 2 is provided with four electrode reaction zones, the flow direction of water in each electrode reaction zone is from top to bottom, a water outlet section of each electrode reaction zone is provided with a water distribution channel, and the water distribution channels are communicated with the water distribution tank 28.
The plurality of electrode plates 26 are uniformly arranged in the tank body 21, and the plate interval between every two adjacent electrode plates 26 is 5.5 cm.
The electrode plate 26 is made of an aluminum plate or an iron plate; the electrode plate 26 comprises a positive plate and a negative plate, and the time interval of automatic switching of the positive plate and the negative plate is less than or equal to 5 min.
The gas-liquid mixing device 23 adopts a gas-liquid mixing pump, the liquid-gas ratio is 1-2:9, and the gas quantity is 0.16m3Min, air pressure 0.20 MPa.
The four electrode reaction areas adopt a down-flow mode, the water level of two adjacent electrode reaction areas is reduced by 10cm, and the water distribution groove 28 of each corresponding electrode reaction area is simultaneously reduced by 10 cm.
Example 4
An electric flocculation desiliconization process of silicon-containing wastewater, which comprises the following steps:
1) collecting raw water containing silicon into a raw water collecting pool 1, pumping the raw water containing silicon in the raw water collecting pool 1 into a softening device 7, and removing hardness to ensure that the hardness of the raw water containing silicon is not higher than 100 mg/L;
2) feeding the water body with hardness removed in the step 1) into an electric flocculation device 2 for electrolysis treatment, and then feeding the water body after electrolysis treatment into a sedimentation tank 3 for standing and layering; the voltage during the electrolytic treatment was 25v, and the current density was 63A/m2The electrolytic treatment time is 35 min;
3) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank 3 in the step 2), and sending the upper layer clear liquid after sedimentation and delamination in the sedimentation tank 3 into the intermediate water tank 4 for secondary sedimentation;
4) and (3) sending the supernatant subjected to secondary sedimentation in the intermediate water tank 4 in the step 3) into a multi-media filter 5 for filtration, and finally desalting the filtered filtrate for recycling.
An electrocoagulation silicon-removing system for silicon-containing wastewater, which is used for implementing the treatment system of the electrocoagulation silicon-removing process for silicon-containing wastewater, and comprises a raw water collecting tank 1, an electrocoagulation device 2, a sedimentation tank 3, an intermediate water tank 4, a multi-media filter 5 and a desalination treatment tank 5 which are sequentially communicated according to the treatment use sequence, wherein the electrocoagulation device 2 comprises a tank body 21, a rectifier 22, a gas-liquid mixing device 23, an aeration pipe 24, a plurality of partition plates 25, a plurality of electrode plates 26 and a plurality of leads 27, the partition plates 25 are vertically arranged in the tank body 21 and divide the tank body 21 into a plurality of electrode reaction zones, the electrode plates 26 are vertically arranged in the electrode reaction zones, outlets of the gas-liquid mixing device 23 are arranged at the bottom in the tank body 21 and are uniformly distributed in the electrode reaction zones, the rectifier 22 is arranged at one side of the tank body 21, and the electrode plates 26 are communicated with the rectifier 22 through, the gas-liquid mixing device 23 is arranged on the middle pipeline of the tank body 21 and the raw water collecting tank 1; further, a strong aeration system using perforated aeration tubes 24 is disposed in the electrode zone.
The electric flocculation device 2 also comprises a water distribution tank 28 arranged at the bottom in the tank body 21; the upper end of the partition 25 is provided with an overflow opening 251 which penetrates through the partition 25.
The electric flocculation device 2 is provided with four electrode reaction zones, the flow direction of water in each electrode reaction zone is from top to bottom, a water outlet section is provided with a water distribution channel, and the water distribution channel is communicated with the water distribution tank 28.
The plurality of electrode plates 26 are uniformly arranged in the tank body 21, and the plate distance between every two adjacent electrode plates 26 is 5.75 cm.
The electrode plate 26 is made of an aluminum plate or an iron plate; the electrode plate 26 comprises a positive plate and a negative plate, and the time interval of automatic switching of the positive plate and the negative plate is less than or equal to 5 min.
The gas-liquid mixing device 23 adopts a gas-liquid mixing pump, the liquid-gas ratio is 1-2:9, and the gas quantity is 0.17m3Min, air pressure 0.21 MPa.
The four electrode reaction areas adopt a down-flow mode, the water level of two adjacent electrode reaction areas is reduced by 11cm, and the water distribution groove 28 of each corresponding electrode reaction area is simultaneously reduced by 11 cm.
Example 5
An electric flocculation desiliconization process of silicon-containing wastewater, which comprises the following steps:
1) collecting raw water containing silicon into a raw water collecting pool 1, pumping the raw water containing silicon in the raw water collecting pool 1 into a softening device 7, and removing hardness to ensure that the hardness of the raw water containing silicon is not higher than 100 mg/L;
2) feeding the water body with hardness removed in the step 1) into an electric flocculation device 2 for electrolysis treatment, and then feeding the water body after electrolysis treatment into a sedimentation tank 3 for standing and layering; the voltage during the electrolytic treatment was 26v, and the current density was 65A/m2The electrolytic treatment time is 40 min;
3) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank 3 in the step 2), and sending the upper layer clear liquid after sedimentation and delamination in the sedimentation tank 3 into the intermediate water tank 4 for secondary sedimentation;
sending the supernatant subjected to secondary sedimentation in the intermediate water tank 4 in the step 3) into a multi-media filter 5 for filtration, and finally desalting the filtered filtrate and recycling the filtrate to obtain an electrocoagulation silicon removal system for silicon-containing wastewater, wherein the electrocoagulation silicon removal system for implementing the silicon-containing wastewater electrocoagulation silicon removal process comprises a raw water collecting tank 1, an electrocoagulation device 2, a sedimentation tank 3, an intermediate water tank 4, a multi-media filter 5 and a desalting treatment tank 5 which are sequentially communicated according to the treatment and use sequence, the electrocoagulation device 2 comprises a tank body 21, a rectifier 22, a gas-liquid mixing device 23, an aeration pipe 24, a plurality of partition plates 25, a plurality of electrode plates 26 and a plurality of leads 27, the partition plates 25 are vertically arranged in the tank body 21 and divide the tank body 21 into a plurality of electrode reaction zones, the electrode plates 26 are vertically arranged in the electrode reaction zones, outlets of the gas-liquid mixing device 23 are arranged at the bottom in the tank body 21 and are uniformly distributed in the electrode reaction zone, the rectifier 22 is arranged at one side of the tank body 21, the electrode plates 26 are communicated with the rectifier 22 through leads 27, and the gas-liquid mixing device 23 is arranged on a pipeline between the tank body 21 and the raw water collecting tank 1; further, a strong aeration system using perforated aeration tubes 24 is disposed in the electrode zone.
The electric flocculation device 2 also comprises a water distribution tank 28 arranged at the bottom in the tank body 21; the upper end of the partition 25 is provided with an overflow opening 251 which penetrates through the partition 25.
The electric flocculation device 2 is provided with four electrode reaction zones, the flow direction of water in each electrode reaction zone is from top to bottom, a water outlet section is provided with a water distribution channel, and the water distribution channel is communicated with the water distribution tank 28.
The electrode plates 26 are uniformly arranged in the groove body 21, and the plate distance between every two adjacent electrode plates 26 is 6 cm.
The electrode plate 26 is made of an aluminum plate or an iron plate; the electrode plate 26 comprises a positive plate and a negative plate, and the time interval of automatic switching of the positive plate and the negative plate is less than or equal to 5 min.
The gas-liquid mixing device 23 adopts a gas-liquid mixing pump, the liquid-gas ratio is 1-2:9, and the gas quantity is 0.18m3Min, air pressure 0.22 MPa.
The four electrode reaction areas adopt a down-flow mode, the water level of two adjacent electrode reaction areas is reduced by 12cm, and the water distribution groove 28 of each corresponding electrode reaction area is simultaneously reduced by 12cm
Comparative example 1
This comparative example differs from example 1 above in that: the current density in the electrolytic treatment was 65/m2。
Other technical features of this comparative example are the same as those of example 1, and will not be described again.
Comparative example 2
This comparative example differs from example 3 above in that: the plate pitch of the electrode plates 26 was 1.5 cm.
Other technical features of this comparative example are the same as those of example 3, and will not be described again.
Comparative example 3
This comparative example differs from example 5 above in that: the time interval between the automatic switching of the positive plate and the negative plate during the electrolytic treatment was 60 min.
Other technical features of this comparative example are the same as those of example 5, and will not be described again.
Comparative example 4
This comparative example differs from example 5 above in that: the electrolytic treatment was carried out without providing the gas-liquid mixing device 23 for gas-stirring the bath solution.
Other technical features of this comparative example are the same as those of example 5, and will not be described again.
According to GB/T12149-2007 determination of silicon in industrial circulating cooling water and boiler water, the silicon content of water bodies before and after treatment of examples 1, 3 and 5 of the present invention and comparative examples 1-4 was measured, the silicon content in silicon-containing wastewater, the silicon content in recovered water after treatment, the silicon removal rate before and after treatment, and the scaling in an electrocoagulation device were calculated, and the test results are shown in Table 1:
TABLE 1
According to the test data, the silicon-containing wastewater is treated by adopting the silicon-removing treatment process and the silicon-removing treatment system, the current density and the voltage of the electric flocculation device in the electrolysis process, the plate interval of the electrode plates, the time interval of automatic switching of the positive plate and the negative plate and the aeration stirring operation are strictly controlled, the silicon-removing rate is high, the silicon-containing wastewater is obviously removed, no chemical additive is required to be added in the process, the secondary pollution of the chemical additive to the water body is avoided, and the treated water body can be recycled and reused, so that the silicon-containing wastewater can be suitable for large-scale treatment.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (10)
1. An electric flocculation desiliconization process of silicon-containing wastewater, which is characterized in that: the method comprises the following steps:
1) collecting silicon-containing raw water into a raw water collecting pool, pumping the silicon-containing raw water in the raw water collecting pool into a softening device, and removing hardness to ensure that the hardness of the silicon-containing raw water is not higher than 100 mg/L;
2) feeding the water body subjected to hardness removal in the step 1) into an electric flocculation device for electrolysis treatment, and then feeding the water body subjected to electrolysis treatment into a sedimentation tank for standing and layering;
3) discharging the lower layer sediment after sedimentation and delamination in the sedimentation tank in the step 2), and sending the supernatant after sedimentation and delamination in the sedimentation tank into an intermediate water tank for secondary sedimentation;
4) and (3) sending the supernatant subjected to secondary sedimentation in the intermediate water tank in the step 3) into a multi-media filter for filtration, and finally desalting the filtered filtrate for recycling.
2. The electric flocculation desiliconization process of silicon-containing wastewater according to claim 1, characterized in that: the voltage during the electrolytic treatment in the step 2) is 22-26v, the current is 5000-6000A, and the current density is 55-65A/m2The electrolytic treatment time is 20-40 min.
3. The utility model provides an electric flocculation desiliconization system of siliceous waste water which characterized in that: the electric flocculation silicon removal system is used for treating silicon-containing wastewater, and comprises a raw water collecting tank, an electric flocculation device, a sedimentation tank, an intermediate water tank, a multi-media filter and a desalination treatment tank which are sequentially communicated according to the treatment and use sequence, the electric flocculation device comprises a tank body, a rectifier, a gas-liquid mixing device, a plurality of partition plates, a plurality of electrode plates and a plurality of leads, the baffle plates are vertically arranged in the cell body and divide the cell body into a plurality of electrode reaction zones, the electrode plates are vertically arranged in the electrode reaction zones, the outlets of the gas-liquid mixing device are arranged at the bottom in the tank body and are uniformly distributed in the electrode reaction area, the rectifier set up in one side of cell body, the plate electrode all through the wire with the rectifier intercommunication, gas-liquid mixing device set up in on the middle pipeline of cell body and raw water collecting pit.
4. The system for the electric flocculation silicon removal of the silicon-containing wastewater according to claim 3, wherein: the electric flocculation device also comprises a water distribution groove arranged at the bottom in the tank body.
5. The system for the electric flocculation silicon removal of the silicon-containing wastewater according to claim 3, wherein: the plurality of electrode plates are uniformly arranged in the cell body, and the plate distance between every two adjacent electrode plates is 5-6 cm.
6. The system for the electric flocculation silicon removal of the silicon-containing wastewater according to claim 3, wherein: the electrode plate is made of aluminum plates or iron plates.
7. The system for the electric flocculation silicon removal of the silicon-containing wastewater according to claim 3, wherein: the electrode plate comprises a positive plate and a negative plate, and the time interval of automatic switching of the positive plate and the negative plate is less than or equal to 5 min.
8. The system for the electric flocculation silicon removal of the silicon-containing wastewater according to claim 3, wherein: the gas-liquid mixing device adopts a gas-liquid mixing pump, and the liquid-gas ratio is 1-2: 9.
9. The system for the electric flocculation silicon removal of the silicon-containing wastewater according to claim 4, wherein: the electric flocculation device is provided with four electrode reaction zones, the flow direction of water in each electrode reaction zone is from top to bottom, a water outlet section of each electrode reaction zone is provided with a water distribution channel, and the water distribution channels are communicated with the water distribution grooves.
10. The system for the electric flocculation silicon removal of the silicon-containing wastewater according to claim 9, wherein: the four electrode reaction areas adopt a down-flow mode, the water level of two adjacent electrode reaction areas is reduced by 8-12cm, and the water distribution groove of each corresponding electrode reaction area is simultaneously reduced by 8-12 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011063029.6A CN112499848A (en) | 2020-09-30 | 2020-09-30 | Electric flocculation silicon removal process and system for silicon-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011063029.6A CN112499848A (en) | 2020-09-30 | 2020-09-30 | Electric flocculation silicon removal process and system for silicon-containing wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112499848A true CN112499848A (en) | 2021-03-16 |
Family
ID=74953574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011063029.6A Pending CN112499848A (en) | 2020-09-30 | 2020-09-30 | Electric flocculation silicon removal process and system for silicon-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112499848A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328973A (en) * | 2011-07-29 | 2012-01-25 | 周义斌 | High-efficiency electrocoagulation processor and intelligent electric control device thereof |
| CN102730888A (en) * | 2012-06-28 | 2012-10-17 | 北京京润新技术发展有限责任公司 | High hardness and high turbidity industry wastewater treatment method |
| US20150053619A1 (en) * | 2013-08-21 | 2015-02-26 | Baker Hughes Incorporated | Process for Hardness and Boron Removal |
| CN109354134A (en) * | 2018-10-24 | 2019-02-19 | 东莞市三人行环境科技有限公司 | A kind of method of electric flocculation removal anodic oxidation Determinating Chromaticity of Dyeing Effluent |
| CN110723849A (en) * | 2019-11-21 | 2020-01-24 | 东莞市三人行环境科技有限公司 | Silicon-containing wastewater silicon removal treatment process and system |
| CN111635066A (en) * | 2020-04-30 | 2020-09-08 | 安徽进化硅纳米材料科技有限公司 | Method and device for recovering soluble silicon in silicon-containing wastewater |
-
2020
- 2020-09-30 CN CN202011063029.6A patent/CN112499848A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328973A (en) * | 2011-07-29 | 2012-01-25 | 周义斌 | High-efficiency electrocoagulation processor and intelligent electric control device thereof |
| CN102730888A (en) * | 2012-06-28 | 2012-10-17 | 北京京润新技术发展有限责任公司 | High hardness and high turbidity industry wastewater treatment method |
| US20150053619A1 (en) * | 2013-08-21 | 2015-02-26 | Baker Hughes Incorporated | Process for Hardness and Boron Removal |
| CN109354134A (en) * | 2018-10-24 | 2019-02-19 | 东莞市三人行环境科技有限公司 | A kind of method of electric flocculation removal anodic oxidation Determinating Chromaticity of Dyeing Effluent |
| CN110723849A (en) * | 2019-11-21 | 2020-01-24 | 东莞市三人行环境科技有限公司 | Silicon-containing wastewater silicon removal treatment process and system |
| CN111635066A (en) * | 2020-04-30 | 2020-09-08 | 安徽进化硅纳米材料科技有限公司 | Method and device for recovering soluble silicon in silicon-containing wastewater |
Non-Patent Citations (1)
| Title |
|---|
| 李本高等: "《现代工业水处理技术与应用》", 30 June 2004, 北京：中国石化出版社, pages: 385 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101844844B (en) | Device for treating high-concentration electroplating wastewater and application thereof | |
| CN107522327B (en) | Electric flocculation-precipitation-advanced oxidation integrated papermaking wastewater treatment device | |
| CN102115286A (en) | Treatment method for recycling coking wastewater and assembled treatment system | |
| CN205133286U (en) | Full automatic processing equipment of nickeliferous waste water of high concentration | |
| CN210528679U (en) | Mine water resourceful treatment recycling system | |
| CN111087095A (en) | Method for preparing high-quality drinking water | |
| CN111704281A (en) | Device and method for quickly treating and recycling car washing wastewater | |
| CN202107588U (en) | Circulation cooling water on-line purifier | |
| CN211004911U (en) | Modular copper-containing effluent treatment plant of high concentration | |
| CN210855500U (en) | Sewage treatment and recycling system | |
| CN116655172A (en) | Reverse osmosis-based electric power light sewage and wastewater treatment system and process | |
| CN107055772A (en) | A kind of anaerobic organism decalcification system and decalcification method | |
| CN112499848A (en) | Electric flocculation silicon removal process and system for silicon-containing wastewater | |
| CN111018203B (en) | Nickel-containing heavy metal wastewater resource recovery device | |
| CN211226709U (en) | Zero discharge system of desulfurization waste water | |
| CN210855619U (en) | Contain salt organic waste water electrocatalytic oxidation coupling preprocessing device | |
| CN201665596U (en) | Pretreatment device for coking wastewater recycling and combined treatment system | |
| CN111573972A (en) | Grinding ultrasonic cleaning wastewater zero-discharge recycling or standard-reaching treatment system and process | |
| CN209740890U (en) | Cutting fluid integration processing apparatus | |
| CN102923888A (en) | Method for electrochemical treatment of PVC centrifugation mother liquor and pretreatment system | |
| CN104909505A (en) | Treatment system applied to industrial desalination | |
| CN215161876U (en) | High-efficient recycling system of passivation waste water | |
| CN218290685U (en) | Sewage zero discharge system of sulfur acid production device | |
| CN210001702U (en) | electric flocculation-slow decarburization combined system for circulating water sewage of thermal power plant | |
| CN210795944U (en) | Wastewater softening processor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |