CN110563197A - Recycling and reusing treatment system and process for polycrystalline silicon cleaning wastewater - Google Patents
Recycling and reusing treatment system and process for polycrystalline silicon cleaning wastewater Download PDFInfo
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- 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
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- 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
- C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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Abstract
The invention relates to a recycling and reusing treatment system for polysilicon cleaning wastewater, which comprises a wastewater storage tank, a filter press, a filtrate collecting tank, a micro-sand circulating device, a disc filter, a shallow sand filter and a precision filter which are sequentially connected along the feeding direction of the polysilicon cleaning wastewater, wherein an aeration stirring device is arranged in the wastewater storage tank, a pH medicine adding device is connected between the filtrate collecting tank and the micro-sand circulating device, and a chlorine dioxide generator is connected at the outlet of the precision filter. Compared with the prior art, the invention has the advantages of no pollution, continuous water treatment, stable water outlet, simple process flow, lower construction and operation cost, realization of automatic intelligent control, low management and maintenance cost, and excellent environmental protection value and economic advantage.
Description
Technical Field
the invention relates to the technical field of wastewater treatment, in particular to a recycling and reusing treatment system and a recycling and reusing treatment process for polycrystalline silicon cleaning wastewater.
Background
The fresh water resources in China are deficient, and the water environment faces three problems all the time: water resource shortage, uneven space-time distribution and serious pollution. The Chinese ecological environment situation bulletin in 2018 indicates that: in 1935 water quality sections (point positions) monitored by surface water nationwide, the proportion of I to III classes is 71.0 percent, and the proportion of inferior V classes is 6.7 percent. In 1613 water quality sections monitored by Yangtze river, yellow river, Zhujiang river, Songhua river, Huaihe river, Haihe river, Liaohe seven river basin and Zhejian river, northwest river and southwest river, the I category accounts for 5.0%, the II category accounts for 43.0%, the III category accounts for 26.3%, the IV category accounts for 14.4%, the V category accounts for 4.5% and the bad V category accounts for 6.9%. 7 lakes (reservoirs) with class I water quality in 111 important lakes (reservoirs) for monitoring water quality account for 6.3 percent; 34 II accounts for 30.6%; 33 in class III, accounting for 29.7%; 19 IV, accounting for 17.1%; 9V types account for 8.1%; the inferior V types are 9 and account for 8.1 percent. The main pollution indicators are total phosphorus, chemical oxygen demand and permanganate index. Through the gradual improvement of environmental protection departments, water treatment technical workers and various environmental protection laws and regulations, compared with 2017, the fresh water resource pollution condition in 2018 of China is improved, but the per capita water resource occupancy of China is still very poor, and the water body pollution condition is still very serious.
With the increase of global population and the improvement of human living standard, the imbalance and unreasonable of energy structure makes the days of traditional energy exhaustion more and more. Solar energy has become one of the best choices for social development as an available clean energy source. High-purity silicon is used as a raw material for preparing a crystalline silicon solar cell, and the production link is basically realized by utilizing a multi-wire cutting mode, namely, a steel wire running at a high speed carries mortar containing SiC particles to cut a silicon ingot into silicon blocks and cut the silicon blocks into silicon wafers, so that a large amount of water is needed for spraying and washing operation, the silicon blocks and the silicon wafers which are full of the mortar are subjected to pre-cleaning treatment, cleaning wastewater contains a large amount of silicon powder, the concentration of suspended matters is high, and the problems of resource waste and environmental pollution are caused by direct discharge.
From the current treatment process of polysilicon cleaning wastewater, the pretreatment cleaning wastewater treatment process mainly has the following problems: 1. the recovery rate is low, and the waste water is often mixed with high-concentration organic pollution waste water generated by subsequent silicon wafer processing even if the waste water enters a recycling treatment system, so that the pertinence is lacked; 2. the water treatment equipment has various types, the full-automatic intelligent control is difficult to realize, and the operation and maintenance cost is high; 3. the use of a large amount of chemical agents is easy to cause secondary pollution and unstable effluent quality, thereby causing resource waste. Therefore, the method has important significance for further reducing the process cost, improving the quality of the polycrystalline silicon product and saving water resources, and recycling and treating the polycrystalline silicon cleaning wastewater.
Disclosure of Invention
The invention aims to solve the problems and provide a recycling and reusing treatment system and a process for polysilicon cleaning wastewater, which can overcome the water resource waste caused by the existing polysilicon hydraulic flushing link.
the purpose of the invention is realized by the following technical scheme:
the treatment system comprises a wastewater storage tank, a filter press, a filtrate collecting tank, a micro-sand circulating device, a disc filter, a shallow sand filter and a precision filter which are sequentially connected along the feeding direction of polycrystalline silicon cleaning wastewater, wherein an aeration stirring device is arranged in the wastewater storage tank, a pH dosing device is connected between the filtrate collecting tank and the micro-sand circulating device, and an outlet of the precision filter is connected with a chlorine dioxide generator. The micro-sand circulating device can efficiently and quickly remove Suspended Solids (SS) in water, the disc filter, the shallow sand filter and the precision filter can further purify impurities in the water, and the filtering precision of the micro-sand circulating device is sequentially increased to be 100 micrometers, 50 micrometers and 5 micrometers respectively.
Preferably, the aeration stirring device is arranged at the bottom of the waste water storage tank, the ratio of the effective water volume to the ventilation volume is 1 (3-5), and the aeration stirring device plays a role in preventing solid matters from being precipitated and uniformly mixed at the bottom of the storage tank.
Preferably, the filter press adopts a plate-and-frame filter press, the filter cake obtained by separating the washing waste liquid after dead-end filtration is carried out on the filter cloth layer, namely, the silicon powder is collected into a ton bag, the filtrate is collected into a filtrate collecting tank, no filter aid or chemical additive is added in the filter pressing process, the silicon powder and water can be efficiently separated in the pure physical filtration process, and the total recovery rate of the silicon powder is more than 95%.
Preferably, an alkali adding pump is arranged in the pH dosing device, the pH value of the filtrate is adjusted to 7-8, the pH dosing device is designed and selected from a full-automatic intelligent control dosing device, the model is ECH-F-604, the pH value of the effluent of the screw pump can be continuously monitored on line, the pH value is adjusted by controlling the starting and stopping of the alkali adding pump, and the pH value is ensured to be always maintained in the optimal state.
Preferably, the micro-sand circulating device comprises a coagulation area, a flocculation area, a high-speed sedimentation area and a micro-sand water outlet area, wherein a mixing agent is added into the coagulation area, and after rapid mixing and stirring, colloid in the wastewater is destabilized to form precipitable micro-flocs; adding a high-molecular mixing agent and micro-sand in the flocculation area, wherein the micro-sand accelerates the formation of a macromolecular flocculating constituent and increases the weight and the volume of the flocculating constituent, thereby accelerating the sedimentation speed which is more than 10 times of that of a common sedimentation tank; the precipitated sludge is conveyed into a mud-sand separation hydrocyclone, the micro-sand is recycled and returned into an injection groove, and the sludge is completely discharged out of the system. The micro-sand circulating device can integrate a series of processes such as reinforced coagulation, inclined plate sedimentation, micro-sand crystals, cyclone separation and the like, can reach a set treatment state in a short time (usually less than 20 minutes), and is a stable and efficient sedimentation technology.
Preferably, the disc filter adopts a reinforced polyamide shell and a laminated filter element, the filtering precision of the disc filter is 50-100 mu m, waste water passes through the laminated filter element from the outside, and the filtering laminated filter element is tightly pressed together under the action of spring force and liquid force, so that large-particle substances are trapped at the crossed points of the laminated filter element;
The shallow sand filter adopts quartz sand filter filler, a water collector is arranged in the shallow sand filter, the filtering precision of the shallow sand filter is less than 50 mu m, and when water flows through the filler layer, impurities are trapped in the filler layer;
the precision filter adopts the filter core that is made by polypropylene spray-melting, filtration micropore on the filter core is the toper structure, and its filter fineness is less than 5 mu m, and filtration efficiency is high, can hold back mechanical impurity or granule that probably leak in leading pipeline, the equipment, guarantees that water quality of water is stable clean, and the filter core needs regularly to be changed, and the system can be with pressure differential data transmission to total control room to the suggestion maintainer in time change filter core.
Preferably, the disc filter and the shallow sand filter share a backwashing controller, the disc filter and the shallow sand filter are controlled to automatically enter a backwashing state, the backwashing state of each filter is reasonably controlled through time and pressure difference control, the high-efficiency backwashing state of the disc filter can be finished within 20 seconds, the water collector specially designed for the shallow sand filter enables the packing layer to form internal circulation when the packing layer is in the backwashing state, the packing materials are scrubbed mutually, the backwashing efficiency is improved to the maximum extent, and required backwashing water is reduced.
Preferably, the chlorine dioxide generator is provided with an adjustable chlorine dioxide adding device, the adding amount of chlorine dioxide in the reuse water is controlled to be 1-2mg/L, the residual chlorine in the process effluent can be continuously monitored on line, and the adding amount of chlorine dioxide is reduced while the disinfection effect of the reuse water is ensured. The effective content of the chlorine dioxide generator is more than 80%, the raw materials are sodium chlorate (industrial first-grade product, the content is more than or equal to 99%) and hydrochloric acid (industrial first-grade product, the concentration is more than or equal to 31%), and the components of the produced composite disinfectant are mainly chlorine dioxide (about 70%) and auxiliary chlorine (about 30%). The total conversion rate of raw materials of the chlorine dioxide generator is more than or equal to 90 percent, and the energy consumption is low.
Preferably, the cleaning wastewater in the wastewater storage tank is pumped to a filter press through a sludge screw pump, the sludge screw pump is provided with a constant-pressure variable-frequency control system so as to reduce impact on filter pressing equipment, and the filtrate in the filtrate collection tank is pumped to a micro-sand circulating device through a lifting pump.
preferably, the system adopts a programmable process control system to control each process of the reuse water treatment, process parameters of each section are introduced into a control system of a control room to carry out centralized monitoring, and detection of various parameters of the production process, such as temperature, pressure, flow, liquid level, chemical analysis and the like, is completed by the control system.
A process for recycling and reusing a treatment system by adopting polysilicon cleaning wastewater is characterized by comprising the following steps:
(a) Pretreatment: aerating and filter-pressing the polysilicon cleaning wastewater obtained from the polysilicon cleaning system, and separating filter cakes and filtrate obtained after filter-pressing;
(b) Deep treatment: adopting a micro-sand circulating device, a disc filter, a shallow sand filter and a precision filter which are sequentially connected in series along the feeding direction of the polysilicon cleaning wastewater, and carrying out multiple filtration treatment on the filtrate obtained by the pretreatment to obtain crude water;
(c) And (3) post-treatment: and (4) sterilizing the crude water obtained by the advanced treatment, and refluxing the crude water into a polysilicon cleaning system after the crude water reaches the water quality standard of reuse water.
The recycling treatment process can well perform resource treatment on the polysilicon cleaning wastewater, and the removal rate of the wastewater containing a large amount of silicon powder and other suspended solids is more than 98%. The pretreatment adopts a separation process of plate-and-frame filter pressing, no chemical agent is required to be added, and no secondary pollution is caused. Four water treatment devices are selected for the subsequent advanced treatment process and are used in series, the process compactness is high, and effluent can flow back to the polysilicon hydraulic flushing system for reuse after being disinfected. The recovery treatment process can continuously perform water treatment, has stable water outlet, simple process flow, lower construction and operation cost, low management and maintenance cost, and excellent environmental protection value and economic advantage, and can realize automatic intelligent control.
Drawings
FIG. 1 is a schematic flow chart of a process for recycling and reusing polysilicon cleaning wastewater.
FIG. 2 is a schematic view of a structure of a recycling and reusing treatment system for polysilicon cleaning wastewater.
FIG. 3 is a schematic view of the top view of the polysilicon cleaning wastewater recycling and reusing treatment system.
1-a blower, 2-a sludge screw pump, 3-a filter press, 4-a filtrate lift pump, 5-a pH dosing device, 6-a coagulation dosing device, 7-a flocculation dosing device, 8-a circulation lift pump, 9-a chlorine dioxide generator, 10-a disc filter, 11-a shallow sand filter, 12-a precision filter, 13-a back flush controller, 14-a wastewater storage tank, 15-a filtrate collection tank, 16-a micro-sand device coagulation area, 17-a micro-sand device flocculation area, 18-a micro-sand device high-speed sedimentation area, 19-a micro-sand device water outlet area, 20-a polycrystalline silicon cleaning system, 21-an aeration stirring device, 22-a water outlet lift pump and 23-an automatic intelligent control device.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
example 1
A treatment system for recycling and reusing polycrystalline silicon cleaning wastewater can refer to figures 2 and 3, and comprises a wastewater storage tank 14, a filter press 3, a filtrate collecting tank 15, a micro-sand circulating device, a disc filter 10, a shallow sand filter 11 and a precision filter 12 which are sequentially connected along the feeding direction of polycrystalline silicon cleaning wastewater, wherein an aeration stirring device 21 is arranged in the wastewater storage tank 14, the aeration stirring device 21 is connected with an air blower 1, a pH medicine adding device 5 is connected between the filtrate collecting tank and the micro-sand circulating device, and a chlorine dioxide generator 9 is connected at the outlet of the precision filter 12.
the ratio of the effective water volume of the aeration stirring device to the ventilation volume is 1 (3-5).
The filter press adopts a plate and frame filter press.
An alkali adding pump is arranged in the pH medicine adding device, and the pH of the filtrate is adjusted to 7-8.
the micro-sand circulating device comprises a micro-sand device coagulation area 16, a micro-sand device flocculation area 17, a micro-sand device high-speed sedimentation area 18 and a micro-sand device water outlet area 19, wherein the micro-sand device coagulation area 16 is provided with a coagulation medicine adding device 6 for adding a mixing agent, and the micro-sand device flocculation area 17 is provided with a flocculation medicine adding device 7 for adding a high-molecular mixing agent and micro-sand. The high-speed settling zone 18 of the micro-sand device can also return liquid to the coagulation zone 16 of the micro-sand device through the circulating lift pump 8. The outlet area 19 of the micro-sand device leads the outlet water into the polysilicon cleaning system 20 through an outlet lift pump 22.
The disc filter adopts a reinforced polyamide shell and a laminated filter element; the shallow sand filter adopts quartz sand filter filler, and a water collector is arranged inside the shallow sand filter; the precise filter adopts a filter element made of polypropylene by spray melting, and the filtering micropores on the filter element are in a conical structure.
The disc filter and the shallow sand filter share a backwashing controller 13, and the disc filter and the shallow sand filter are controlled to automatically enter a backwashing state.
The chlorine dioxide generator is provided with an adjustable chlorine dioxide adding device, and the adding amount of the chlorine dioxide in the reuse water is controlled to be 1-2 mg/L.
Cleaning wastewater in the wastewater storage tank 14 is sent to the filter press 3 through the sludge screw pump 2 (matched with a constant-pressure variable-frequency control system), and filtrate in the filtrate collection tank 15 is sent to the micro-sand circulating device through the filtrate lifting pump 4.
The system can also be provided with an automatic intelligent control device 23.
As shown in fig. 1, a process for recycling and reusing polysilicon cleaning wastewater, which comprises the following steps:
(a) Pretreatment: aerating and primarily filtering the polysilicon cleaning wastewater obtained from the polysilicon cleaning system, and separating a filter cake and a filtrate obtained after primary filtering;
(b) Deep treatment: adopting a micro-sand circulating device, a disc filter, a shallow sand filter and a precision filter which are sequentially connected in series along the feeding direction of the polysilicon cleaning wastewater, and carrying out multiple filtration treatment on the filtrate obtained by the pretreatment to obtain crude water;
(c) And (3) post-treatment: and (4) sterilizing the crude water obtained by the advanced treatment, and returning the crude water to the polysilicon cleaning system after the crude water reaches the water quality standard of the reuse water.
By adopting the recycling and reusing treatment process and system for polycrystalline silicon cleaning wastewater, the daily discharge amount of the polycrystalline silicon cleaning wastewater is 600m3The method comprises the following steps of carrying out recycling treatment on polycrystalline silicon cleaning wastewater by a certain new energy development limited company in Jiangsu, wherein initial cleaning water is derived from municipal tap water, and the implementation steps are as follows:
(1) The recycling treatment system runs automatically and intelligently for 24 hours all day, and the wastewater treatment capacity is 25m3h is used as the reference value. The cleaning wastewater is firstly collected into the wastewater storage tank, the system can be effectively prevented from being impacted by flow and water quality, and the effective volume of the wastewater storage tank is 50m3The hydraulic retention time is 2 hours, and meanwhile, the bottom of the waste water storage tank is provided with an aeration stirring device, the gas-water ratio is 1:3, and the air consumption is 1.25m3And/min, the waste water can be uniformly mixed, and the water in the storage tank can be effectively prevented from precipitating.
(2) The sludge screw pump 2 is used for conveying the cleaning wastewater to the filter press, and the pump is provided with a frequency converter for flexible starting and stopping, so that the device has the functions of overheating, short circuit, open-phase protection and frequency conversion speed regulation, and the impact on the device is reduced. Two 230m plate-and-frame filter presses are selected for design2the membrane type filter press is provided with a belt conveyor for centralized conveying, and the wastewater enters a filter cloth layerand (4) filtering at a dead end, conveying a filter cake to a ton bag, and collecting filtrate to a collecting tank.
(3) The filtrate is conveyed to a micro-sand circulating device by a lifting pump for advanced treatment, and the water quality of the inlet water of the device is as follows: SS is less than or equal to 500mg/L, turbidity is less than or equal to 50NTU, and the pH value of inlet water is adjusted to 7-8. After three main links of coagulation, flocculation and high-speed sedimentation, the SS of the effluent of the device is less than 200 mg/L.
(4) The effluent of the micro-sand circulating device enters a disc filter, and the filter element of the disc filter performs water purification through the surface interception and concentration condensation effects, so that the filtering effect is greatly improved, and the SS (suspended solid) of the effluent of the disc filter is less than 70 mg/L.
(5) the outlet water of the disc filter enters a shallow sand filter, and the inlet water passes through a water distributor at the upper part of the device and reaches a packing layer in the filter in a state close to advection. The bottom of the shallow sand filter adopts a water collector of a tree-shaped water collecting and distributing device, and filtered water is uniformly collected and flows out. The equipment can filter at a high flow rate, a good filtering effect is achieved, and SS (suspended solid) of the device effluent is less than 10 mg/L. In the filter set, the backwashing process is alternately carried out, and the continuous water outlet can be ensured by automatically switching between the working state and the backwashing state.
(6) The outlet water of the shallow sand filter enters a precision filter, 25 filter elements are arranged in the precision filter, the water yield of each filter element is 1.0-1.2t/h, and the water yield of each filter element is ensured to be more than 25m3The SS of the effluent is less than 5 mg/L.
(7) The filtered clean water is disinfected by a chlorine dioxide generator, the adding amount of the effective chlorine is set to be 1.0mg/L, and the disinfected clean water reaches the standard of reuse water.
The treatment process for recycling and reusing the polysilicon cleaning water in the photovoltaic industry is reliable in technology, high in intelligence, simple to operate and stable in effluent quality, and the treated cleaning water flows back to a polysilicon pre-cleaning system.
Example 2
By adopting the recycling and reusing treatment process and system for the polysilicon cleaning wastewater as described in example 1, the daily discharge amount of the polysilicon cleaning wastewater is 600m3The new energy development Limited company of Jiangsu carries out the recycling of the polysilicon cleaning wastewaterWith the treatment, the initial wash water was derived from municipal tap water, and the steps were performed:
(1) The recycling treatment system runs automatically and intelligently for 24 hours all day, and the wastewater treatment capacity is 25m3H is used as the reference value. The cleaning wastewater is firstly collected into a wastewater storage tank, the system can be effectively prevented from being impacted by flow and water quality, the effective volume of the wastewater storage tank is 50m3, the hydraulic retention time is 2h, meanwhile, an aeration stirring device is arranged at the bottom of the wastewater storage tank, the gas-water ratio is 1:5, and the air consumption is 1.25m3And/min, the waste water can be uniformly mixed, and the water in the storage tank can be effectively prevented from precipitating.
(2) The sludge screw pump is used for conveying the cleaning wastewater to the filter press, and the pump is provided with the frequency converter for flexible starting and stopping, so that the device has the functions of overheating, short circuit, open-phase protection and frequency conversion speed regulation, and the impact on the device is reduced. Two 230m plate-and-frame filter presses are selected for design2The membrane type filter press is provided with a belt conveyor for centralized conveying, wastewater enters a filter cloth layer for dead-end filtration, a filter cake is conveyed to a ton bag, and filtrate is collected to a collecting tank.
(3) The filtrate is conveyed to a micro-sand circulating device by a lifting pump for advanced treatment, and the water quality of the inlet water of the device is as follows: SS is less than or equal to 500mg/L, turbidity is less than or equal to 50NTU, and the pH value of inlet water is adjusted to 7-8. After three main links of coagulation, flocculation and high-speed sedimentation, the SS of the effluent of the device is less than 200 mg/L.
(4) The effluent of the micro-sand circulating device enters a disc filter, and the filter element of the disc filter performs water purification through the surface interception and concentration condensation effects, so that the filtering effect is greatly improved, and the SS (suspended solid) of the effluent of the disc filter is less than 70 mg/L.
(5) The outlet water of the disc filter enters a shallow sand filter, and the inlet water passes through a water distributor at the upper part of the device and reaches a packing layer in the filter in a state close to advection. The bottom of the shallow sand filter adopts a water collector of a tree-shaped water collecting and distributing device, and filtered water is uniformly collected and flows out. The equipment can filter at a high flow rate, a good filtering effect is achieved, and SS (suspended solid) of the device effluent is less than 10 mg/L. In the filter set, the backwashing process is alternately carried out, and the continuous water outlet can be ensured by automatically switching between the working state and the backwashing state.
(6) The outlet water of the shallow sand filter enters a precision filter, 25 filter elements are arranged in the precision filter, the water yield of a single filter element is 1.0-1.2t/h, the water yield of a single design is ensured to be more than 25m3/h, and the SS of the outlet water is less than 5 mg/L.
(7) the filtered clean water is disinfected by a chlorine dioxide generator, the adding amount of the effective chlorine is set to be 2.0mg/L, and the disinfected clean water reaches the standard of reuse water.
the treatment process for recycling and reusing the polysilicon cleaning water in the photovoltaic industry is reliable in technology, high in intelligence, simple to operate and stable in effluent quality, and the treated cleaning water flows back to a polysilicon pre-cleaning system.
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 treatment system is characterized by comprising a wastewater storage tank, a filter press, a filtrate collecting tank, a micro-sand circulating device, a disc filter, a shallow sand filter and a precision filter which are sequentially connected along the feeding direction of polycrystalline silicon cleaning wastewater, wherein an aeration stirring device is arranged in the wastewater storage tank, a pH dosing device is connected between the filtrate collecting tank and the micro-sand circulating device, and a chlorine dioxide generator is connected at the outlet of the precision filter.
2. The system for recycling and reusing treatment of polysilicon cleaning wastewater as recited in claim 1, wherein the ratio of the effective water volume to the aeration rate of said aeration stirring device is 1 (3-5).
3. The polysilicon cleaning wastewater recycling and reusing treatment system as claimed in claim 1, wherein the filter press is a plate and frame filter press.
4. The system for recycling and reusing treatment of polysilicon cleaning wastewater as recited in claim 1, wherein an alkali adding pump is disposed in the pH adding device, and the pH of the filtrate is adjusted to 7-8.
5. The polysilicon cleaning wastewater recycling and reusing treatment system according to claim 1, wherein the micro-sand circulation device comprises a coagulation zone, a flocculation zone, a high-speed sedimentation zone and a micro-sand water outlet zone, wherein a mixing agent is added to the coagulation zone, and a polymer mixing agent and micro-sand are added to the flocculation zone.
6. The polysilicon cleaning wastewater recycling and reusing treatment system according to claim 1, wherein the disc filter employs a reinforced polyamide housing and a laminated filter element;
The shallow sand filter adopts quartz sand filter filler, and a water collector is arranged inside the shallow sand filter;
the precision filter adopts a filter element made of polypropylene by spray melting, and the filtering micropores on the filter element are of a conical structure.
7. The polysilicon cleaning wastewater recycling and reusing treatment system as claimed in claim 1, wherein the disc filter and the shallow sand filter share a backwash controller to control the filter to automatically enter a backwash state.
8. The system for recycling and reusing treatment of polysilicon cleaning wastewater according to claim 1, wherein the chlorine dioxide generator is provided with an adjustable chlorine dioxide feeding device, and the feeding amount of chlorine dioxide in the reused water is controlled to be 1-2 mg/L.
9. The system as claimed in claim 1, wherein the cleaning wastewater in the wastewater storage tank is pumped to a filter press by a sludge screw, and the filtrate in the filtrate collection tank is pumped to a micro-sand circulation device by a lifting pump.
10. A process for adopting the polysilicon cleaning wastewater recycling and reusing treatment system according to any one of claims 1 to 9, which comprises the following steps:
(a) Pretreatment: aerating and filter-pressing the polysilicon cleaning wastewater obtained from the polysilicon cleaning system, and separating filter cakes and filtrate obtained after filter-pressing;
(b) Deep treatment: adopting a micro-sand circulating device, a disc filter, a shallow sand filter and a precision filter which are sequentially connected in series along the feeding direction of the polysilicon cleaning wastewater, and carrying out multiple filtration treatment on the filtrate obtained by the pretreatment to obtain crude water;
(c) And (3) post-treatment: and (4) sterilizing the crude water obtained by the advanced treatment, and refluxing the crude water into a polysilicon cleaning system after the crude water reaches the water quality standard of reuse water.
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| CN111606436A (en) * | 2020-06-03 | 2020-09-01 | 浙江天地环保科技股份有限公司 | Denitration catalyst regeneration wastewater pretreatment system and method |
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