A zero-emission river water taking device for industrial production

Abstract

The application relates to a method and device for zero-emission river water taking for industrial production, which comprises the following steps: taking river water to a purifier; flowing the purified water into an industrial pool and then into a circulating pool; recycling and utilizing the water in the circulating pool through a circulating water pollution discharge recovery system; discharging the filter sludge generated by the purifier into a sludge sedimentation tank for collection and sedimentation to form supernatant and sedimentation sludge; returning the supernatant of the sludge sedimentation tank to the purifier, flowing into the industrial pool after purification; conveying the sedimentation sludge of the sludge sedimentation tank to a stacked-screw sludge dewatering machine for dewatering treatment to obtain dewatering clear water and dewatering sludge; conveying the dewatering clear water to the circulating water pollution discharge recovery system for treatment, and then flowing into the circulating pool; and conveying the dewatering sludge to an incinerator for incineration. The method realizes zero-emission of river water taking for industrial production.

Description

Technical Field

[0001] This application relates to the technical field of safe and environmentally friendly comprehensive treatment of river water intake for industrial production, and in particular to a device for zero-discharge river water intake for industrial production. Background Technology

[0002] In production, the use of polluted groundwater resources can severely corrode related machinery and equipment, reducing their lifespan and impacting agricultural production efficiency. Wastewater pollution not only seriously affects industrial and agricultural development but also poses a significant threat to human health; contaminated water enters the human body through drinking or the food chain, ultimately leading to acute or chronic poisoning. Water pollution also harms the aquatic ecosystem, with the harm varying depending on the nature of the pollutants, primarily manifested in eutrophication and disruption of the aquatic ecological balance. With the introduction of a series of environmental protection measures, environmental red lines have become the lifeline for enterprises, making the need for production enterprises to meet environmental standards and achieve zero emissions extremely urgent.

[0003] Currently, river water intake is mainly treated using integrated water purifier equipment. The treatment process is a combination of "vertical flow sedimentation tank + gravity valveless filter". This combined equipment mainly includes a water intake system, pipeline mixer, vertical flow sedimentation tank, gravity valveless automatic backwash filter, dosing device, and water storage tank. It has the advantages of strong resistance to shock loads, low head loss, fully automatic backwashing, low failure rate, stable operation and simple operation and management. It has become a widely adopted treatment method at home and abroad. However, these methods cannot meet the urgent needs of enterprises for zero discharge. Moreover, vertical flow sedimentation tanks and valveless filters require a large amount of sludge to be discharged after a period of operation, which poses a risk of secondary pollution. During the operation of production circulating water, due to evaporation and concentration, production indicators such as concentration ratio, turbidity, chloride ion, total alkalinity and total hardness of circulating water gradually increase. In order to ensure that the circulating water quality meets the standards, a large amount of wastewater needs to be discharged during daily production. Utility Model Content

[0004] To address the shortcomings of existing process combinations, this application proposes a device for zero-discharge river water intake for industrial production, which enables further recycling and treatment of sludge and wastewater generated from river water intake, and deep purification treatment of circulating water discharge, thus achieving the zero-discharge requirement for river water intake in production.

[0005] This application provides a device for zero-discharge river water intake for industrial production, comprising:

[0006] Water purifiers are used to remove suspended solids and impurities from water drawn from rivers and lakes.

[0007] An industrial water tank, connected to the water purifier, is used to hold purified water for industrial production.

[0008] A circulating water tank, and the industrial water tank, are used to hold water that has passed through the industrial water tank;

[0009] A circulating water wastewater recovery system is connected to the circulating water tank to recycle and reuse the water in the circulating water tank.

[0010] A sludge settling tank, connected to the water purifier, is used to collect and settle the filtered sludge produced by the purifier to form a supernatant and settled sludge; the supernatant is returned to the purifier and, after purification by the purifier, flows into the industrial water tank; and

[0011] A screw press sludge dewatering machine is connected to the sludge sedimentation tank and the circulating water sewage recovery system. It is used to dewater the sedimented sludge to obtain dewatered water and dewatered sludge. The dewatered water is transported to the circulating water sewage recovery system for treatment and then flows into the circulating water tank. The dewatered sludge is transported to the incinerator for incineration.

[0012] Furthermore, the circulating water wastewater recovery system includes:

[0013] An equalization tank is used to hold the wastewater discharged from the circulating water tank, and a submersible mixer is installed in the equalization tank;

[0014] A lime-soda ash reaction tank, connected to the equalization tank, is used to carry the wastewater discharged from the equalization tank and to chemically soften the wastewater by adding lime and soda ash.

[0015] A high-efficiency flocculation sedimentation tank is connected to the lime-soda reaction tank and is used to carry the effluent from the lime-soda reaction tank.

[0016] A multi-media filter, connected to the high-efficiency flocculation sedimentation tank, is used to filter the effluent from the high-efficiency flocculation sedimentation tank.

[0017] An ultrafilter, connected to the multi-media filter, is used to perform ultrafiltration on the effluent from the multi-media filter; and

[0018] The ultrafiltration permeate tank, connected to the ultrafilter, is used to remove dissolved salts from the water before it enters the RO system via the RO feed pump and then enters the circulating water tank. The reverse osmosis concentrate is treated by lime slurry preparation.

[0019] Furthermore, the high-efficiency flocculation sedimentation tank includes a flocculation reaction zone, an inclined tube sedimentation zone, a neutralization tank, and a sludge thickening tank; after the flocculation reaction zone is reacted with added chemicals, the effluent enters the inclined tube sedimentation zone, the effluent from the inclined tube sedimentation zone enters the neutralization tank through a collection trough, and the sludge discharged from the inclined tube sedimentation tank enters the sludge thickening tank.

[0020] Furthermore, the sludge settling tank also includes a submersible sewage pump for transporting the settled sludge to the screw press sludge dewatering machine for dewatering.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] This application combines integrated water purifier technology, automatic recycling of supernatant from sludge sedimentation tank, screw press sludge dewatering, and wastewater purification and reuse technology from circulating water tank. During the wastewater discharge process of the integrated water purifier, the discharged sludge is collected, achieving sludge-water separation. The supernatant after clarification in the sedimentation tank is automatically recycled. The remaining sludge after recycling is fed into a screw press sludge dewatering machine for dewatering. The dewatered sludge is transported to the in-plant incinerator for incineration. The dewatered sludge water is further treated in the circulating water wastewater reuse system and then recycled back to the circulating water tank.

[0023] Wastewater from the production cycle is fully treated through the circulating wastewater system. The reverse osmosis concentrate is returned to the plant for lime slurry preparation, while the reverse osmosis effluent is returned to the circulating water tank as makeup water. Through comprehensive treatment using multiple processes and equipment, all pollutants generated during the production process and from river water intake are treated in a fully quantified and harmless manner, ultimately achieving a safe and environmentally friendly comprehensive treatment method for zero-discharge river water intake. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0026] Figure 1 This is a schematic diagram of the overall framework and process flow of a zero-discharge river water intake device for industrial production according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the overall framework and process of the circulating water sewage recovery system in the embodiments of this application. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0029] In the description of this application, it should be understood that the orientations or positional relationships indicated by terms, etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device, element, module, system, platform, or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The following description of this application is only to be understood as a description of individual embodiments of the technical solutions of this application. Other embodiments are not reflected in the following description, but this does not mean that this application excludes these other embodiments, nor is the technical solution of this application limited to the specific implementations described below, and the protection scope of this application is not limited to the specific implementations described below. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this application.

[0030] It should be noted that if the terms "first," "second," etc., appear in the specification, claims, and accompanying drawings of this application, such descriptions are only used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device that comprises a series of units, modules, or components is not necessarily limited to those explicitly listed, but may include other components not explicitly listed or inherent to such systems, products, or devices.

[0031] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] In some embodiments, such as Figure 1As shown, this application provides a method and apparatus for zero-discharge river water intake for industrial production. The apparatus 1 for zero-discharge river water intake for industrial production includes a water purifier 11 for removing suspended solids and impurities from the river water after intake; an industrial water tank 12 connected to the water purifier 11 for holding the purified water for industrial production; a circulating water tank 13 connected to the industrial water tank 12 for holding the water that has passed through the industrial water tank; a circulating water wastewater recovery system 16 connected to the circulating water tank 13 for recycling the water in the circulating water tank 13; and a sludge sedimentation tank 14 connected to the water purifier 11. A connection is provided for collecting and settling the filtered sludge generated by the purifier 11 to form a supernatant and settled sludge; the supernatant is returned to the purifier 11 and, after being purified by the purifier 11, flows into the industrial water tank 12; and a screw press sludge dewatering machine 15 is connected to the sludge settling tank 14 and the circulating water discharge and recovery system 16, for dewatering the settled sludge to obtain dewatered water and dewatered sludge; the dewatered water is transported to the circulating water discharge and recovery system 16 for treatment and then flows into the circulating water tank 13; the dewatered sludge is transported to the incinerator for incineration. The sludge settling tank 14 also includes a submersible sewage pump (not shown) for transporting the settled sludge to the screw press sludge dewatering machine 15 for dewatering.

[0033] In some embodiments, such as Figure 2 As shown, the circulating water wastewater recovery system 16 includes:

[0034] The regulating tank 161 is used to carry the wastewater discharged from the circulating water tank 13, and a submersible mixer is installed in the regulating tank 161;

[0035] The lime-soda ash reaction tank 162 is connected to the equalization tank 161 and is used to carry the wastewater discharged from the equalization tank 161, and to chemically soften the wastewater by adding lime and soda ash.

[0036] A high-efficiency flocculation sedimentation tank 163 is connected to the lime-soda ash reaction tank 162 and is used to carry the effluent from the lime-soda ash reaction tank 162. The high-efficiency flocculation sedimentation tank 163 includes a flocculation reaction zone 1631, an inclined tube sedimentation zone 1632, a neutralization tank 1633, and a sludge thickening tank 1634. After the flocculation reaction zone 1631 is reacted with added chemicals, the effluent enters the inclined tube sedimentation zone 1632. The effluent from the inclined tube sedimentation zone 1632 enters the neutralization tank 1633 through a water collection trough. The sludge discharged from the inclined tube sedimentation tank 1632 enters the sludge thickening tank 1634.

[0037] A multi-media filter 164 is connected to the high-efficiency flocculation sedimentation tank 163 and is used to filter the effluent from the high-efficiency flocculation sedimentation tank 163.

[0038] Ultrafilter 165, connected to the multi-media filter 164, is used to perform ultrafiltration on the effluent from the multi-media filter 164; and

[0039] The ultrafiltration permeate tank 166 is connected to the ultrafiltration 165 and is used to enter the RO system through the RO feed pump to remove dissolved salts in the water before entering the circulating water tank 13. The reverse osmosis concentrate is treated by lime slurry preparation.

[0040] In some embodiments, such as Figure 1-2 As shown, a method for zero-discharge river water intake for industrial production includes:

[0041] Water is drawn from the river and fed into the purifier 11, which is used to remove suspended solids and impurities from the water.

[0042] Surface water from rivers and other sources is pumped into an integrated water purifier for treatment, removing suspended solids and impurities to reduce turbidity. The final effluent from the integrated water purifier has a turbidity of ≤5 NTU and is collected in an industrial water storage tank. During this process, suspended sludge and colloidal particles accumulate within the integrated water purifier. Therefore, the sludge discharge valve needs to periodically drain the sludge into a sludge sedimentation tank to ensure normal operation. This sludge is a mixture with a water content exceeding 98%. Specifically, surface water from rivers and other sources is pumped to an 80 m³... 3 The integrated water purifier processes approximately 1200 m³ of water from rivers. 3 / d, its sewage discharge is approximately 180-220 m³ / d. 3 / d, single discharge volume ≤23 m³ 3 The turbidity of the effluent from the integrated water purifier is ≤5 NTU, and the effluent is collected in an industrial water storage tank.

[0043] The purified water flows into the industrial water tank 12 and then into the circulating water tank 13;

[0044] The water in the circulating water tank 13 is recycled and reused through the circulating water sewage recovery system 16;

[0045] The filtered sludge produced by the purifier 11 is discharged into the sludge sedimentation tank 14 for collection and sedimentation to form supernatant and settled sludge.

[0046] Based on the equipment's wastewater discharge volume, a sufficiently large sludge sedimentation tank will be constructed to collect the wastewater from the integrated water purifier for further treatment. Specifically, based on the equipment's wastewater discharge volume, a 140 m³ sedimentation tank will be constructed. 3 The sludge sedimentation tank is a collection tank where wastewater undergoes sludge-water separation for further treatment.

[0047] The supernatant from the sludge sedimentation tank 14 is returned to the purifier 11, and after being purified by the purifier 11, it flows into the industrial water tank 12.

[0048] The system uses a self-priming pump to control the water level in the sludge sedimentation tank. Through a high, medium and low level automatic control electrical system, when the integrated water purifier discharges wastewater, the automatic system enters a delay waiting command. After the wastewater clarifies, the supernatant pump is activated to reprocess the supernatant from the sludge tank through the integrated water purifier before reusing it to the industrial water tank.

[0049] The settled sludge from the sludge sedimentation tank 14 is transported to the screw press sludge dewatering machine 15 for dewatering treatment to obtain dewatered clean water and dewatered sludge.

[0050] The desludge-removed clean water is transported to the circulating water sewage recovery system 16 for treatment, and then flows into the circulating water pool 13 after treatment.

[0051] The sludge-removed water is treated by ultrafiltration membrane in the circulating water wastewater recovery system and then reused in the circulating water tank. The treatment process of the circulating water wastewater recovery system is a circulating wastewater re-purification system consisting of "equalization tank + softening + sedimentation + multi-media filtration + ultrafiltration + reverse osmosis". The clean water is reused in the circulating water tank, and the concentrate is returned to lime slurry preparation. The total hardness of the softening reaction system is less than 50 mg / L, and the recovery rate of the reverse osmosis system is ≥75% of the reverse osmosis system feed water volume. The system requires a desalination rate ≥97% and a chloride ion removal rate ≥90%.

[0052] The dewatered sludge is then transported to an incinerator for incineration.

[0053] After the supernatant from the sludge sedimentation tank is recycled, the settled sludge is transported to a screw press sludge dewatering machine for dewatering via a submersible sewage pump; the dewatered sludge after treatment by the screw press sludge dewatering machine has a moisture content of ≤80%.

[0054] The sludge sedimentation tank of this application is used to collect sludge discharged from the integrated water purifier, including both automatic and manual discharge from the integrated water purifier, achieving full-volume sedimentation. When the sludge sedimentation tank reaches a high water level, the automatic supernatant recycling system is activated. At this time, the automatic control electrical system is turned on, and the time relay starts timing. Based on the sludge sedimentation time, which is generally one hour, the sludge can be completely settled. After the time relay activates, the return water pump starts working. The clarified supernatant from the sludge sedimentation tank is pumped back to the integrated water purifier for further purification before being discharged back into the industrial water storage tank. This process ensures full recycling of the wastewater discharged from the integrated water purifier, achieving water conservation and eliminating the environmental risks caused by wastewater overflow. Specifically, it can be 80m³. 3 An integrated water purifier with a capacity of approximately 1200 m³ / h, capable of drawing water from rivers and lakes. 3 / h, its sewage discharge is approximately 180-220 m³ / h. 3 / h, through the automatic recycling device of the supernatant in the sludge sedimentation tank, energy-saving recovery of 150-190m³ is achieved. 3 / h of supernatant, with approximately 30m³ of residual sludge. 3 / h is received and processed by sludge dewatering treatment, and the integrated water purifier reduces the pollution source by about 83% (1 - recovery amount / discharge amount * 100%).

[0055] Sludge dewatering treatment includes submersible sewage pumps, screw press sludge dewatering machines, and PAM dosing systems. Before using the screw press sludge dewatering machine, the pH value of the sludge to be treated must be confirmed; it should not be lower than 7. The dosage is approximately 1-2 kg of high-molecular-weight flocculant powder (cationic polyacrylamide with a molecular weight of not less than 12 million) per ton of clean water. Visual inspection is required; the prepared liquid should be slightly viscous and form threads, with minimal undissolved reagent. The reagent ratio per ton of sludge is approximately 0.15%-0.3%. Specifically, the remaining sludge in the sedimentation tank is approximately 30 m³. 3 / d, the sludge is transported to a screw press sludge dewatering machine for desludge treatment via a submersible sewage pump. The total amount of sludge cake discharged is about 1 ton, and the sludge moisture content is ≤80%. After treatment, the sewage discharge source of the integrated purifier is reduced by 99.5% (1 - total amount of discharged sludge cake / sewage discharge * 100%), at which point the sewage discharge source of the integrated purifier remains at 0.5%.

[0056] After treatment using a screw press sludge dewatering machine, the integrated water purifier's discharge rate is only 0.5%, with only about 1 ton / day of sludge. The remaining sludge is then transported back to the plant's incinerator for incineration. After the dewatered sludge is returned to the incinerator for incineration, the wastewater source has achieved zero emissions.

[0057] In some embodiments, the processing of the circulating water wastewater recovery system 16 includes:

[0058] The wastewater discharged from the circulating water tank 13 enters the equalization tank 161, and a submersible mixer is installed in the equalization tank 161;

[0059] Wastewater discharged from equalization tank 161 is pumped into lime-soda ash reaction tank 162 by a wastewater lift pump, and lime and soda ash are added to chemically soften the wastewater. Wastewater discharged from equalization tank 161 is pumped into lime-soda ash reaction tank. Lime and soda ash can be added sequentially as needed to chemically soften the influent. By adjusting the concentration and amount of lime, the pH of reaction tank 1 is ensured to be around 11 (empirical value), preferably 10-12. The specific value is based on the appearance of white suspended matter (calcium carbonate) in reaction tank 1.

[0060] The effluent from the lime-soda ash reaction tank 162 flows into the high-efficiency flocculation sedimentation tank 163, where chemicals are added. After reacting in the flocculation reaction zone 1631, it enters the inclined tube sedimentation zone 1632. The effluent from the inclined tube sedimentation zone 1632 flows through a collection trough into the neutralization tank 1633. The sludge discharged from the inclined tube sedimentation tank 1632 enters the sludge thickening tank 1634. The effluent from the lime-soda ash reaction tank 162 flows by gravity into the high-efficiency flocculation sedimentation tank 163, where PAC (or polyferric sulfate) and PAM are added. The high-efficiency flocculation sedimentation tank has functions such as flocculation reaction, sedimentation, and sludge discharge. After the influent is treated with chemicals, it reacts in the flocculation reaction zone and then enters the inclined tube sedimentation zone. The effluent from the sedimentation zone flows through a collection trough into the neutralization tank, and the sludge discharged from the sedimentation tank enters the sludge thickening tank.

[0061] Hydrochloric acid is added to the neutralization tank 1633 to adjust the pH value;

[0062] The effluent from the neutralization tank 1633 is pumped to the multi-media filter 164 for filtration. The effluent from the neutralization tank 1633 is pumped to the multi-media filter 164 for filtration, effectively removing suspended solids, colloids, organic matter and other impurities remaining in the water from the previous reaction unit. The backwash water from the multi-media filter is returned to the equalization tank.

[0063] The effluent from the multi-media filter 164 enters the ultrafiltration unit 165; the effluent from the multi-media filter enters the ultrafiltration system to further remove impurities such as suspended solids, colloids, turbidity, organic matter, and bacteria; the ultrafiltration membrane flushing water and chemical cleaning water are discharged to the equalization tank.

[0064] The effluent from ultrafiltration unit 165 is temporarily stored in ultrafiltration permeate tank 166, then enters the RO system via RO feed pump to remove dissolved salts before entering the circulating water tank. The ultrafiltration effluent, after being temporarily stored in the ultrafiltration permeate tank, enters the RO system via RO feed pump to remove dissolved salts, etc., and its permeate meets the effluent quality standards, then is used for circulating water cooling makeup. The reverse osmosis concentrate is recycled within the plant area as water for lime slurry preparation. Reverse osmosis membrane flushing water is discharged into the equalization tank, and the chemically treated water is neutralized before being discharged into the equalization tank.

[0065] All low-concentration wastewater and sewage generated on-site can be collected and transported to the circulating water wastewater reuse system for treatment. The effluent quality meets the requirements for circulating water makeup water, as shown in Table 1 below, and all effluent is returned to the circulating water pool. At this point, all sewage, sludge, and sludge removal water generated from river water intake are completely consumed within the production plant. Through comprehensive treatment using various processes and equipment, a zero-discharge approach is achieved: a comprehensive and safe environmentally friendly treatment method for river water intake.

[0066] Table 1

[0067] project pH value water temperature Turbidity suspended matter COD <![CDATA[Calcium hardness + total alkalinity (calculated as CaCO3)]]> Total Fe <![CDATA[Cl - ]]> Free chlorine unit -- ℃ NTU mg / L mg / L mg / L mg / L mg / L mg / L Influent water quality 7.5～8.8 20-35 ≤25 ≤100 ≤80 ≤2200 ≤1.25 ≤150 ≤0.5 effluent water quality 6.0～9.0 20-35 ≤1 / / ≤20 / ≤10 ≤0.05

[0068] This application presents a comprehensive treatment solution that combines integrated water purifier technology, automatic recycling technology for supernatant from sludge sedimentation tanks, screw press sludge dewatering facilities, and wastewater purification and reuse technology from circulating water tanks. This solution achieves full-scale, harmless treatment of pollution sources generated during the production process and in the production area, ultimately realizing a safe and environmentally friendly comprehensive treatment method for zero-discharge river water intake.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-described embodiments are merely illustrative of several implementation methods of this application and are only used to illustrate the technical solutions of this application, not to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application. For those skilled in the art, several variations and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

Claims

1. A device for zero-discharge river water intake for industrial production, characterized in that, include: Water purifiers are used to remove suspended solids and impurities from water drawn from rivers and lakes. An industrial water tank, connected to the water purifier, is used to hold purified water for industrial production. A circulating water tank, and the industrial water tank, are used to hold water that has passed through the industrial water tank; A circulating water wastewater recovery system is connected to the circulating water tank to recycle and reuse the water in the circulating water tank. A sludge sedimentation tank, connected to the water purifier, is used to collect and settle the filter sludge produced by the water purifier to form supernatant and settled sludge; the supernatant is returned to the water purifier and, after being purified by the water purifier, flows into the industrial water tank; as well as A screw press sludge dewatering machine is connected to the sludge sedimentation tank and the circulating water sewage recovery system. It is used to dewater the sedimented sludge to obtain dewatered water and dewatered sludge. The dewatered water is transported to the circulating water sewage recovery system for treatment and then flows into the circulating water tank. The dewatered sludge is transported to the incinerator for incineration.

2. The device for zero-discharge river water intake for industrial production according to claim 1, characterized in that, The circulating water wastewater recovery system includes: An equalization tank is used to hold the wastewater discharged from the circulating water tank, and a submersible mixer is installed in the equalization tank; A lime-soda ash reaction tank, connected to the equalization tank, is used to carry the wastewater discharged from the equalization tank and to chemically soften the wastewater by adding lime and soda ash. A high-efficiency flocculation sedimentation tank is connected to the lime-soda reaction tank and is used to carry the effluent from the lime-soda reaction tank. A multi-media filter, connected to the high-efficiency flocculation sedimentation tank, is used to filter the effluent from the high-efficiency flocculation sedimentation tank. An ultrafilter, connected to the multi-media filter, is used to perform ultrafiltration on the effluent from the multi-media filter; and The ultrafiltration permeate tank, connected to the ultrafilter, is used to remove dissolved salts from the water before it enters the RO system via the RO feed pump and then enters the circulating water tank. The reverse osmosis concentrate is treated by lime slurry preparation.

3. The device for zero-discharge river water intake for industrial production according to claim 2, characterized in that, The high-efficiency flocculation sedimentation tank includes a flocculation reaction zone, an inclined tube sedimentation zone, a neutralization tank, and a sludge thickening tank. After the flocculation reaction zone is treated with added chemicals, the effluent enters the inclined tube sedimentation zone. The effluent from the inclined tube sedimentation zone enters the neutralization tank through a collection trough. The sludge discharged from the inclined tube sedimentation zone enters the sludge thickening tank.

4. The device for zero-discharge river water intake for industrial production according to claim 3, characterized in that: The sludge settling tank also includes a submersible sewage pump for transporting the settled sludge to the screw press sludge dewatering machine for dewatering.

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