A wastewater treatment method and a wastewater treatment system using the same.

Abstract

This invention discloses a wastewater treatment method and a wastewater treatment system using the same, belonging to the field of wastewater treatment technology. It solves a series of problems in traditional wastewater treatment systems, such as slow reaction, low separation and sedimentation efficiency, poor separation effect, and cumbersome and complex process flow. It mainly includes a primary sedimentation tank, a secondary sedimentation tank, and a clear water tank. A flow reaction channel is constructed between the primary sedimentation tank and the enterprise's wastewater discharge outlet, and a water treatment agent solution spraying device is installed on the flow reaction channel. This invention has a unique concept, changing the traditional thinking on stone wastewater treatment. It transforms the mixing of a full tank of wastewater into the mixing of N small portions of wastewater, easily simplifying and fully mixing the wastewater, accelerating the reaction process, achieving high wastewater separation and sedimentation efficiency, thoroughly purifying the wastewater, and saving energy and money. It has significant implications in the field of stone wastewater treatment technology.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology. Specifically, it relates to a wastewater treatment method and system that uses the same concept, which changes the traditional thinking on wastewater treatment in stone processing. It transforms the mixing of a full pool of wastewater into the mixing of N small portions of wastewater, easily simplifying and fully mixing the wastewater, accelerating the reaction process, achieving high efficiency in wastewater separation and sedimentation, thorough and clean wastewater purification, energy saving and economy, reasonable and compact structural design, and high space utilization. Background Technology

[0002] During the cutting and polishing of marble, granite, and other stone materials, a large amount of highly turbid wastewater is generated. The concentration of suspended solids in the wastewater is very high, which is actually marble and granite powder. The powder particles are very small and difficult to filter. It is necessary to add coagulants mainly composed of polyaluminum chloride and flocculants mainly composed of polyacrylamide to accelerate separation and sedimentation. The final sediment is sludge, which is mainly composed of silicon dioxide (SiO2) and calcium carbonate (CaCO3). The sludge is large in quantity and has a certain degree of viscosity.

[0003] When polyacrylamide and polyaluminum chloride are used together, both need to be dissolved first. After dissolution, polyaluminum chloride should be added first, followed by polyacrylamide. Using polyaluminum chloride first neutralizes the charge / destabilizes the colloid to form fine flocs. This reaction step can be understood as the destabilization reaction of stone wastewater. The destabilization reaction time is very short, and it only takes 5-10 seconds for polyaluminum chloride and wastewater to be fully mixed. Then, polyacrylamide is added to further increase the volume of the fine flocs so that they can be fully settled. This reaction step can be understood as the flocculation reaction of stone wastewater. The flocculation reaction time is relatively longer, with the reaction time between polyacrylamide and wastewater being 15-30 minutes.

[0004] The wastewater treatment process described in Chinese patent No. 200810140376.7, entitled "Wastewater Treatment Technology and System for Stone Processing," is the wastewater treatment technology widely used in the stone industry. A detailed description of the traditional wastewater treatment process flow is provided in conjunction with this patent document:

[0005] Traditional wastewater treatment systems consist of a sedimentation tank (equivalent to the "primary sedimentation tank" in this application), a secondary sedimentation tank (equivalent to the "secondary sedimentation tank" in this application), and a clear water tank, arranged sequentially. Both the primary and secondary sedimentation tanks have a sloping surface on one side at their bottom, forming a cone shape to increase the settling area and facilitate the collection and extraction of sludge settled at the bottom. The sludge discharge outlet at the bottom is generally located between the primary and secondary sedimentation tanks. Overflow outlets are provided at the upper ends of the partition walls between the primary and secondary sedimentation tanks, and between the secondary sedimentation tank and the clear water tank, with filters installed at each overflow outlet. Both the primary and secondary sedimentation tanks are equipped with agitators and sludge extraction pipes. These two sludge extraction pipes are connected together and then connected to a centrifugal pump. The centrifugal pump is connected to a filter press, and the clear water produced by the filter press flows back to the clear water tank for reuse via a return pipe. Wastewater from stone processing flows into sedimentation tanks via ditches. To accelerate the settling of suspended solids and increase the particle size of colloids and suspended solids in the wastewater, coagulants and flocculants are added to the wastewater in the sedimentation tanks. During the reaction, to ensure thorough mixing of the coagulants and flocculants with the wastewater, the agitators in the sedimentation tanks and secondary sedimentation tanks must continuously stir the water. Through physical and chemical reactions, the suspended solids in the stone wastewater gradually increase in size and weight, accelerating the settling process and forming sludge at the bottom of the sedimentation tank. As the wastewater volume increases, the upper layer of water is forced to pass through the filter screen at the overflow outlet and overflow into the secondary sedimentation tank for secondary settling. Similarly, sludge forms at the bottom of the secondary sedimentation tank, while the upper layer is relatively clear water. The upper layer of water in the secondary sedimentation tank overflows into a clear water tank, from which the water is either returned to the production workshop for reuse or discharged into a nearby river. The sludge from the sedimentation tank and secondary sedimentation tank is pumped by a centrifugal pump to a filter press for treatment. The clear water produced by the filter press flows back to the clear water tank through the return water pipe for reuse. The stone-sludge cake formed after treatment falls into the dry stone-sludge storage and transportation equipment, or directly into the loading truck for off-site transportation.

[0006] This shows that traditional stone wastewater treatment processes have the following main shortcomings:

[0007] 1. The wastewater flowing out of the enterprise's wastewater outlet enters the sedimentation tank through ditches before the coagulant and flocculant are added. During this period of wastewater flow, the wastewater is not fully utilized, which slows down the wastewater treatment reaction process and reduces the efficiency of wastewater separation and sedimentation.

[0008] 2. As is well known to industry technicians, coagulants and flocculants cannot be added simultaneously. Simultaneous addition will cause a direct flocculation reaction, resulting in a poor visual effect and failing to truly separate sludge from wastewater. Therefore, coagulants must be added first, and the flocculant added only after a few seconds of reaction. To reduce input costs and floor space, traditionally, coagulants and flocculants react in a primary sedimentation tank. The issue of not being able to add coagulants and flocculants simultaneously can only be controlled through the process flow. Specifically, after adding coagulants to the primary sedimentation tank, a large agitator continuously stirs the mixture (the primary sedimentation tank is large, so even with a large agitator, the stirring speed is not fast; therefore, the destabilization reaction time is currently controlled at 15-20 seconds). After several seconds, flocculant solvent is added, and the large agitator continues stirring. The purpose of stirring is to ensure thorough mixing of the flocculant and wastewater. The flocculation stage reaction time is relatively long; after 25 minutes of reaction, coagulants are added to the primary sedimentation tank again, and this cycle of adding coagulants and flocculants is repeated alternately. It is evident that the two reaction processes need to be carried out in separate time periods and require constant switching, and cannot be carried out simultaneously. The separation and precipitation speed is slow, the efficiency is low, the separation effect is poor, the process control is cumbersome and complex, the probability of error is high, and the manual labor intensity is very high.

[0009] 3. In traditional primary sedimentation tanks, wastewater continuously flows in during the reaction process. This results in some unmixed wastewater flowing from the overflow outlet of the primary sedimentation tank into the secondary sedimentation tank. To minimize this, traditional secondary sedimentation tanks are designed with large agitators, similar to those in primary sedimentation tanks. Medium-sized stone processing enterprises typically operate their stone-making equipment (such as stone-making machines) for an average of 20 hours per day. Wastewater treatment is carried out concurrently with production, so each large agitator also operates for an average of 20 hours per day. Over the years, the electrical energy consumed by two large agitators is undoubtedly substantial. Besides high energy consumption, the maintenance costs of large agitators are also high.

[0010] 4. From the timeliness of feeding and the inability of destabilization and flocculation reactions to occur simultaneously, it can be seen that traditional sewage treatment methods have reaction lag problems. The lag at each stage will inevitably lead to the water entering the clear water tank being incompletely purified, and poor sewage treatment effect is inevitable. Summary of the Invention

[0011] The purpose of this invention is to address the shortcomings of existing technologies by providing a uniquely conceived wastewater treatment method and system that changes the traditional approach to wastewater treatment in the stone industry. This method transforms the mixing of a full pool of wastewater into the mixing of N smaller portions of wastewater, easily simplifying and maximizing wastewater mixing, accelerating the reaction process, achieving high efficiency in wastewater separation and sedimentation, thorough and clean wastewater purification, energy saving and economy, and a reasonable and compact structural design with high space utilization.

[0012] This invention is achieved through the following technical solution:

[0013] A wastewater treatment method, characterized by comprising the following steps:

[0014] S1. Construct a primary sedimentation tank, a secondary sedimentation tank, and a clear water tank. The primary sedimentation tank is connected to the secondary sedimentation tank, and the secondary sedimentation tank is connected to the clear water tank.

[0015] S2. A flow reaction channel is constructed between the primary sedimentation tank and the enterprise's wastewater discharge outlet, and a water treatment agent solution spraying device is installed on the flow reaction channel.

[0016] Preferably, in step S2, the flow reaction channel is erected above the primary sedimentation tank, and the effluent from the flow reaction channel falls into the sludge discharge area of ​​the primary sedimentation tank; the flow reaction channel includes at least one branch reaction channel with multiple S-shaped bends, the front part of the branch reaction channel is the first stage reaction channel, and the rear part is the second stage reaction channel.

[0017] A spraying device is installed on the first stage reaction ditch to evenly spray the agent towards the sewage inlet of the first stage reaction ditch;

[0018] The stage two reaction ditch is equipped with a second agent spraying device that sprays the agent evenly towards the sewage inlet of the stage two reaction ditch. Behind the spraying of the second agent spraying device, there is also a curved track shovel device that plays a role in clearing and obstructing the flow.

[0019] The wastewater discharged from the enterprise's wastewater outlet is wastewater from stone processing. The agent sprayed by the first agent spraying device is a coagulant, and the agent sprayed by the second agent spraying device is a flocculant.

[0020] Preferably, the coagulant is polyaluminum chloride and the flocculant is polyacrylamide; the number of branch reaction channels is two, and the two branch reaction channels are symmetrically arranged; a flow-blocking plate is also provided behind the spray device of the agent shown to prevent flow.

[0021] Preferably, the curved track removal device includes a sliding contact line conductive rail fixed to the outer wall of the stage two reaction ditch and maintaining the same direction as the flow trajectory of the stage two reaction ditch; a gear track fixed to both sides of the stage two reaction ditch and maintaining the same direction as the flow trajectory of the stage two reaction ditch; and a sliding track fixed to both sides of the stage two reaction ditch and maintaining the same direction as the flow trajectory of the stage two reaction ditch.

[0022] It also includes a scraping body equipped with a protective cover, which is powered by a sliding contact line current collector that is slidably electrically connected to the conductive rail of the sliding contact line; the scraping body includes a support plate that slides along the sliding rail, and a scraper assembly that scrapes sludge and blocks water flow is fixedly provided at the lower end of the support plate. A controller and a power assembly are fixedly provided above the support plate. The power assembly is driven by a drive shaft, and gear disks that mesh with the gear track are fixed at both ends of the drive shaft.

[0023] Preferably, each of the sliding tracks has sliding grooves on both sides; and each of the support plates has a slider assembly that straddles the sliding track and is adapted to the sliding grooves on both sides.

[0024] Preferably, each slider assembly has two rows of slider groups, each row of slider groups has two roller sliders, and the roller sliders are connected to the support plate via a connecting shaft.

[0025] Preferably, the scraper assembly includes a front scraper and a rear scraper, both equipped with comb teeth. The rear scraper is located behind the front scraper, and the comb teeth of the front scraper and the rear scraper are arranged alternately. Both the front and rear scrapers have drainage holes on their blade surfaces. The front scraper is fixedly connected to the front end face of a vertical plate fixed on a support plate via a polyurethane block, and the rear scraper is fixedly connected to the rear end face of the vertical plate via a polyurethane block.

[0026] Preferably, the agent spraying device includes a high-pressure spray gun equipped with a pressure regulating valve. The inlet of the high-pressure spray gun is connected to the agent tank via an agent pipeline. The high-pressure gas inlet of the high-pressure spray gun is connected to the high-pressure gas chamber via a gas pipeline. The outlet of the high-pressure spray gun is connected to an atomizing nozzle. The high-pressure spray gun is fixedly supported by a horizontal support plate. The horizontal support plate adopts an adjustable angle structure and is connected to a vertical support fixed on the stage-one reaction ditch.

[0027] The second agent spraying device includes a high-pressure spray gun 2 equipped with a pressure regulating valve. The inlet of the high-pressure spray gun 2 is connected to the agent tank 2 via the agent pipeline 2. The high-pressure gas inlet of the high-pressure spray gun 2 is connected to the high-pressure gas chamber 2 via the gas pipeline 2. The outlet of the high-pressure spray gun 2 is connected to an atomizing nozzle. The high-pressure spray gun 2 is fixedly supported by a horizontal support plate 2. The horizontal support plate 2 adopts an adjustable angle structure and is connected to the vertical support 2 on the stage 2 reaction ditch.

[0028] Preferably, the primary sedimentation tank is located in an area relatively far from the enterprise's wastewater discharge outlet. The secondary sedimentation tank and the clear water tank are arranged sequentially from the primary sedimentation tank to the enterprise's wastewater discharge outlet. A flow reaction ditch is erected above the primary sedimentation tank, the secondary sedimentation tank, and the clear water tank. The primary sedimentation tank is connected to the secondary sedimentation tank via an overflow outlet, and the secondary sedimentation tank is connected to the clear water tank via an overflow outlet. The primary and secondary sedimentation tanks are both square tanks, and the clear water tank is L-shaped. The outer contours of the primary sedimentation tank, the secondary sedimentation tank, and the clear water tank are square. The clear water from the clear water tank is returned to the enterprise's production and processing area or discharged into a river via a return pipe.

[0029] A wastewater treatment system that applies the wastewater treatment method described above.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] This invention transforms the mixing of a full pool of wastewater into the mixing of N smaller portions of wastewater. During wastewater flow, the reagent is sprayed evenly in a mist onto each smaller portion. The natural flow of the wastewater allows for rapid and thorough mixing of the wastewater and reagent, with the mixing reaction occurring during the wastewater flow itself, thus advancing the entire wastewater treatment process. Besides fully utilizing the wastewater flow time to shorten the reaction time, this invention also achieves simultaneous destabilization and flocculation reactions, further reducing reaction time and significantly improving the efficiency of wastewater separation and sedimentation in stone processing. The destabilization and flocculation reactions are essentially carried out in two independent reaction vessels, without increasing the plant's footprint. This eliminates the need for traditional, cumbersome process switching, significantly reducing worker workload and error rates. All reactions are natural, smooth, and seamless. It easily simplifies, advances, and fully integrates the two reaction stages of wastewater mixing, resulting in high wastewater separation and sedimentation efficiency and thorough wastewater purification.

[0032] This invention utilizes the energy carried by the natural flow of sewage, eliminating the need to consume other power sources such as large stirring paddles, making it highly energy-efficient, economical, and sustainable.

[0033] The invention features a reasonable and compact spatial layout, high space utilization, easy system construction and implementation, no high-cost large-scale equipment investment, low implementation cost, and simple and economical daily system maintenance. It has strong social and economic benefits and is of great significance in the field of wastewater treatment technology, especially in the field of stone wastewater treatment technology. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the system structure of the present invention.

[0035] Figure 2 This is the present invention. Figure 1Enlarged view of point A in the middle.

[0036] Figure 3 This is the present invention. Figure 1 Enlarged view of section B in the middle.

[0037] Figure 4 This is a schematic diagram of the structure at the location of the spray device for the medicine of the present invention.

[0038] Figure 5 This is a schematic diagram of the structure of the spray device for the second agent and the curved track removal device of the present invention (the protective cover is not hidden).

[0039] Figure 6 This is a schematic diagram of the structure of the spray device for the second agent and the curved track removal device of the present invention (protective cover is hidden).

[0040] Figure 7 This is a schematic diagram of the front view structure of the shovel body of the curved track shovel device of the present invention.

[0041] Figure 8 This is a schematic diagram of the three-dimensional structure of the main body of the curved track removal device of the present invention. Figure 1 .

[0042] Figure 9 This is a schematic diagram of the left-side view of the main body of the curved track removal device of the present invention.

[0043] Figure 10 This is a schematic diagram of the three-dimensional structure of the main body of the curved track removal device of the present invention. Figure 2 .

[0044] Figure 11 This is a partial three-dimensional structural diagram of the assembled agent two spray device, curved track shovel device and stage two reaction ditch of the present invention.

[0045] In the diagram: 1. Primary sedimentation tank; 11. Sewage outlet; 12. Overflow outlet; 2. Secondary sedimentation tank; 3. Clear water tank; 4. Enterprise production and processing area; 41. Enterprise sewage discharge outlet; 42. Combination channel; 421. Dividing line; 5. Branch reaction ditch; 51. Stage 1 reaction ditch; 52. Stage 2 reaction ditch; 6. Chemical spraying device; 61. High-pressure spray gun; 62. Chemical pipeline; 63. Chemical tank; 64. Gas pipeline; 65. High-pressure gas chamber; 66. Horizontal support plate; 67. Vertical support; 68. Baffle plate; 7. Chemical spraying device; 71. High-pressure spray gun; 72. Chemical pipeline; 73. Chemical tank; 74. 75. Gas pipeline II; 76. High-pressure gas chamber II; 77. Horizontal support plate II; 78. Vertical support II; 89. Curved track removal device; 80. Sliding contact line conductive rail; 81. Gear rail; 82. Sliding rail; 83. Protective cover; 84. Sliding contact line current collector; 855. Support plate; 86. Scraper assembly; 87. Front scraper; 88. Rear scraper; 89. Drain hole; 80. Controller; 81. Power assembly; 82. Drive shaft; 83. Gear disk; 84. Polyurethane block; 855. Vertical plate; 86. Slider assembly; 87. Roller slider; 88. Connecting shaft; 89. Vertical electric rail support; 100. Return pipe. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings:

[0047] To enable readers to better understand the design intent of this invention, the technical solutions described below are further described in conjunction with embodiments. It should be noted that the directional terms that may appear in the following paragraphs, including but not limited to "up," "down," "left," "right," "front," and "back," are based on the visual orientation shown in the accompanying drawings and should not be considered as limitations on the scope of protection or technical solutions of this invention. Their purpose is merely to facilitate a better understanding of the technical solutions described in this invention by those skilled in the art.

[0048] In the description of this specification, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1

[0049] like Figure 1 As shown, a wastewater treatment method includes the following steps:

[0050] S1. Construct a primary sedimentation tank 1, a secondary sedimentation tank 2, and a clear water tank 3. Similar to traditional sewage treatment systems, the sludge in the primary sedimentation tank 1 and the secondary sedimentation tank 2 is discharged from the lower discharge outlet 11. Overflow outlets 12 are provided at the upper end of the partition wall between the primary sedimentation tank 1 and the secondary sedimentation tank 2, and at the upper end of the partition wall between the secondary sedimentation tank 2 and the clear water tank 3. Filter screens are installed at the overflow outlets 12. The primary sedimentation tank 1 and the secondary sedimentation tank 2 are connected through the overflow outlets, and the secondary sedimentation tank 2 is connected to the clear water tank 3. The water in the clear water tank 3 can be recycled or directly discharged into a nearby river.

[0051] S2. A flow reaction channel is constructed between the primary sedimentation tank 1 and the enterprise wastewater discharge outlet 41. The wastewater discharged from the enterprise wastewater discharge outlet 41 refers to wastewater from stone processing. A water treatment agent solution spraying device is installed on the flow reaction channel. Specifically, the flow reaction channel is constructed above the primary sedimentation tank 1, and the effluent from the flow reaction channel falls into the sludge discharge area of ​​the primary sedimentation tank 1. Constructing it above the primary sedimentation tank minimizes the occupation of the factory area and, on the other hand, controls the end of the flow reaction channel to face the sludge discharge area of ​​the primary sedimentation tank 1, facilitating rapid sludge discharge and improving sewage discharge efficiency. In this embodiment, the flow reaction channel includes at least one branch reaction channel 5 with multiple S-shaped bends. The front section of the branch reaction channel 5 is the first-stage reaction channel 51, and the rear section is the second-stage reaction channel 52. A first-stage reaction channel 51 is equipped with a first-stage spray device 6 that sprays a chemical agent evenly towards the sewage inlet of the first-stage reaction channel. The chemical agent sprayed by the first-stage spray device 6 is a coagulant. A second-stage reaction channel 52 is equipped with a second-stage spray device 7 that sprays a chemical agent evenly towards the sewage inlet of the second-stage reaction channel. Behind the spray of the second-stage spray device 7, a curved track removal device 8 is provided to remove and obstruct the flow. The chemical agent sprayed by the second-stage spray device 7 is a flocculant.

[0052] The working principle of this embodiment is as follows: After the wastewater from the stone processing plant flows out from the wastewater discharge outlet 41, it enters the branch reaction channel 5. Both the first-stage reaction channel 51 and the second-stage reaction channel 52 are equipped with multiple S-bends. The reaction that occurs in the first-stage reaction channel 51 is the destabilization reaction of the stone processing wastewater. At the wastewater inlet of the first-stage reaction channel 51, a chemical spraying device 6 evenly sprays coagulant onto each small portion of wastewater. Then, the water flow changes direction by colliding multiple times in the S-bends of the first-stage reaction channel 51. The sprayed coagulant solution and the flowing wastewater are fully mixed, and fine flocs are produced in a very short time (5s-10s). Because the flocs are small, no sedimentation occurs in this stage. The end of the first-stage reaction channel 51 is the inlet of the second-stage reaction channel 52. The reaction that occurs in the second-stage reaction channel 52 is the flocculation reaction of the stone processing wastewater. At the entrance of the second-stage reaction ditch 52, the second-stage spray device 7 evenly sprays flocculant onto the wastewater, causing the fine flocs in the stone wastewater to grow larger. The second-stage spray device 7 itself evenly sprays the flocculant solution onto each small branch of wastewater. Then, the water flow changes direction multiple times by colliding within the S-bend of the second-stage reaction ditch 52. The sprayed flocculant solution is thoroughly mixed with the flowing wastewater. Although mixed, the flocculation reaction time is longer than the destabilization reaction time. The faster-reacting flocs will grow large within the second-stage reaction ditch 52, while the slower-reacting ones need to enter the primary sedimentation tank 1 to continue the reaction. The sediment of the stone wastewater is a slurry mainly composed of silica and calcium carbonate powder, which has a certain viscosity. After a period of use, slurry will slowly accumulate at the bottom of the second-stage reaction ditch 52. Therefore, in this embodiment, a curved track scraping device 8 is designed in the stage two reaction ditch 52 to remove and obstruct the flow. The curved track scraping device 8 is located behind the spray of the agent two spraying device 7. On the one hand, the curved track scraping device 8 removes the mud in the stage two reaction ditch 52. On the other hand, when the curved track scraping device 8 is not working, the scraper that is blocked in the stage two reaction ditch 52 can block the water flow. The scraper causes the water flow direction to change suddenly, which promotes more thorough mixing of flocculant solution and sewage and faster reaction speed, thus accelerating flocculation and sedimentation.

[0053] This embodiment transforms the mixing of a full pool of wastewater into the mixing of N smaller portions of wastewater. During wastewater flow, the reagent is sprayed evenly in a mist onto each smaller portion. The natural flow of wastewater allows for rapid and thorough mixing of the wastewater and reagent, and the mixing reaction occurs during the wastewater flow process, thus advancing the entire wastewater treatment process. In addition to fully utilizing the wastewater flow time to shorten the reaction time, this embodiment also achieves simultaneous destabilization and flocculation reactions, further shortening the reaction time and significantly improving the efficiency of stone wastewater separation and sedimentation. The destabilization and flocculation reactions are essentially carried out in two independent reaction vessels, without increasing the plant area. There is no need for the traditional cumbersome process switching, significantly reducing the labor intensity and error rate of workers. All reactions are natural, smooth, and completed in one go. It easily simplifies, advances, and fully achieves wastewater mixing in the two reaction stages, resulting in high wastewater separation and sedimentation efficiency and thorough wastewater purification.

[0054] This embodiment utilizes the energy carried by the natural flow of sewage, eliminating the need to consume other power sources such as large stirring paddles, making it very energy-efficient and economical, and with strong sustainable development capabilities.

[0055] This embodiment features a reasonable and compact spatial layout, high space utilization, easy system construction and implementation, no high-cost large-scale equipment investment, low implementation cost, and simple and economical daily system maintenance. It has strong social and economic benefits and is of great significance in the field of wastewater treatment technology, especially in the field of stone wastewater treatment technology.

[0056] Example 2

[0057] Based on Example 1, the present invention continues to describe in detail the technical features involved therein and the functions and roles of these technical features in the present invention, so as to help those skilled in the art to fully understand the technical solution of the present invention and reproduce it.

[0058] like Figures 1 to 11 As shown, a wastewater treatment method includes the following steps:

[0059] S1. Construct a primary sedimentation tank 1, a secondary sedimentation tank 2, and a clear water tank 3. The sludge in the primary sedimentation tank 1 and the secondary sedimentation tank 2 is discharged from the lower sewage outlet 11. Overflow outlets 12 are provided at the upper ends of the partition walls between the primary sedimentation tank 1 and the secondary sedimentation tank 2, and at the upper ends of the partition walls between the secondary sedimentation tank 2 and the clear water tank 3. Filter screens are installed at each overflow outlet 12. The primary sedimentation tank 1 and the secondary sedimentation tank 2 are connected through the overflow outlets, and the secondary sedimentation tank 2 is connected to the clear water tank 3. The water in the clear water tank 3 can be recycled or directly discharged into a nearby river. In this embodiment, the primary sedimentation tank 1 is located in an area relatively far from the enterprise's sewage discharge outlet 41. The secondary sedimentation tank 2 and the clear water tank 3 are arranged sequentially from the primary sedimentation tank 1 to the enterprise's sewage discharge outlet 41. The primary sedimentation tank 1 and the secondary sedimentation tank 2 are both square tanks, while the clear water tank 3 is L-shaped. The outer contours of the primary sedimentation tank 1, the secondary sedimentation tank 2, and the clear water tank 3 are square. The clear water from the clear water tank 3 is returned to the enterprise's production and processing area 4 or discharged into a river via a return pipe 9.

[0060] S2. A flow reaction channel is constructed between the primary sedimentation tank 1 and the enterprise wastewater discharge outlet 41. The wastewater discharged from the enterprise wastewater discharge outlet 41 refers to wastewater from stone processing. A water treatment agent solution spraying device is installed on the flow reaction channel. In this embodiment, the flow reaction channel, primary sedimentation tank 1, secondary sedimentation tank 2, and clear water tank 3 are all equipped with patrol paths for easy daily maintenance. In this embodiment, the flow reaction channel is not only constructed above the primary sedimentation tank 1, but also above the secondary sedimentation tank 2 and the clear water tank 3. The effluent from the flow reaction channel falls into the sludge discharge area of ​​the primary sedimentation tank. Constructing it above the primary sedimentation tank minimizes the occupation of the factory area and also controls the end of the flow reaction channel to face the sludge discharge area of ​​the primary sedimentation tank 1, facilitating rapid sludge discharge and improving sewage discharge efficiency. In this embodiment, the circulating reaction channel includes two branch reaction channels 5. Wastewater flows out from the enterprise's wastewater discharge outlet 41 and enters the confluence channel 42. It then flows into the two branch reaction channels 5 through the dividing line 421 of the confluence channel 42. The two branch reaction channels 5 are symmetrically arranged. The front section of the branch reaction channel 5 is the first-stage reaction channel 51, and the rear section is the second-stage reaction channel 52. A chemical spraying device 6 is installed on the first-stage reaction channel 51 to uniformly spray the chemical agent towards the wastewater inlet of the first-stage reaction channel. The chemical agent sprayed by the chemical spraying device 6 is a coagulant, which is polyaluminum chloride. In this embodiment, a flow-blocking plate 68 is also provided behind the spraying device 6 to block the flow. The flow-blocking plate 68 can be added or not as needed. The flow-blocking plate 68 blocks the flow and changes the flow direction of the water to ensure that the sprayed coagulant solution is fully mixed with the flowing wastewater. The second stage reaction ditch 52 is equipped with a second agent spraying device 7 that sprays the agent evenly towards the sewage inlet of the second stage reaction ditch. Behind the spraying of the second agent spraying device 7, there is also a curved track shovel device 8 that plays a role in clearing and obstructing the flow. The agent sprayed by the second agent spraying device 7 is a flocculant, and the flocculant is polyacrylamide.

[0061] The curved track removal device 8 in this embodiment includes a sliding contact line conductive rail 81 fixed on the outer wall of the second stage reaction ditch 52 and maintaining the same direction as the flow trajectory of the second stage reaction ditch 52. The sliding contact line conductive rail 81 is fixed to the outer wall of the second stage reaction ditch 52 in a suspended state through a vertical electric rail bracket 87; a gear track 82 fixed on both sides of the second stage reaction ditch 52 and maintaining the same direction as the flow trajectory of the second stage reaction ditch 52; and a sliding track 83 fixed on both sides of the second stage reaction ditch 52 and maintaining the same direction as the flow trajectory of the second stage reaction ditch 52.

[0062] The curved track shovel removal device 8 also includes a shovel removal body equipped with a protective cover 84, which is preferably enclosed to protect the components inside the curved track shovel removal device 8. The shovel removal body is powered by a sliding contact line current collector 851 that is slidably electrically connected to the sliding contact line conductive rail 81. The shovel removal body includes a support plate 852 that slides along the sliding rail 83. A scraper assembly 853 for scraping sludge and blocking water flow is fixedly installed at the lower end of the support plate 852. A controller 854 and a power assembly 855 are fixedly installed above the support plate 852. The power assembly 855 is driven by a drive shaft 856, and gear disks 857 that mesh with the gear rail 82 are fixed at both ends of the drive shaft 856. The power assembly 855 specifically includes a motor, a reducer, etc. Both the power assembly 855 and the controller 854 are powered by the sliding contact line current collector 851. The flocs in the second-stage reaction ditch 52 are large in volume and easily settle. Furthermore, the sediment from the stone wastewater itself has a certain viscosity, requiring regular removal of the sludge from the second-stage reaction ditch 52, typically every 5-7 days. The curved track shovel device 8, in addition to removing the sludge, also acts as a flow obstructor. When no removal is needed, the shovel body of the curved track shovel device 8 remains within the second-stage reaction ditch 52, abruptly changing the direction of water flow to ensure thorough mixing of the flocculant and wastewater. During removal, the curved track shovel device 8 reciprocates within the second-stage reaction ditch 52. The number of reciprocations of the curved track shovel device 8 can be set by the controller 854 according to actual needs. The movement range of the curved track shovel device 8 can be limited using existing technologies such as position sensors or limit switches; these are existing technologies and will not be elaborated upon here to avoid unnecessary detail. The curved track scraping device in this embodiment has a reasonable and ingenious structural design, low cost, and is easy to implement. When it is necessary to remove mud, it will perform a stable and reliable curved scraping motion. When it is not necessary to remove mud, it will act as a flow-blocking tool to ensure that the agent and sewage in the stage two reaction ditch 52 are fully mixed. In addition, the curved track scraping device 8 does not need to operate frequently, has low energy consumption, and is energy-saving and economical.

[0063] The operation of the curved track shovel device 8 is as follows: A DC power supply, typically 12V-24V, is connected to the sliding contact line conductive rail 81, selected based on the power requirements of the power assembly and controller. The sliding contact line conductive rail 81 on each stage two reaction ditch 52 can be designed on only one side. The sliding contact line conductive rail 81 provides power to the power assembly 855 and controller 854 via the sliding contact line current collector 851. After being energized, the power assembly 855 drives the transmission shaft 856 to rotate. The rotation of the transmission shaft 856 drives the gear disk 857 to roll on the gear track 82, thereby driving the slider assembly 86 to slide along the sliding track 83. This allows the shovel body to slide along the stage two reaction ditch 52. The scraper assembly 853 of the shovel body scrapes the sludge settled in the stage two reaction ditch 52 into the primary sedimentation tank 1, where it falls into the sludge discharge area.

[0064] In this embodiment, each sliding track 83 has sliding grooves on both sides; each side of the support plate 852 has a slider assembly 86 that straddles the sliding track 83 and matches the sliding grooves. Each slider assembly 86 has two rows of slider groups, and each row of slider groups has two roller sliders 861. The roller sliders 861 are connected to the support plate 852 via a connecting shaft 862. The structural design is stable and reliable. The straddling structure design allows the shovel to move stably and freely no matter how curved the curve.

[0065] In this embodiment, the scraper assembly 853 includes a front scraper 8531 and a rear scraper 8532, both equipped with comb teeth. The rear scraper 8532 is located behind the front scraper 8531, and the comb teeth of the front scraper 8531 and the rear scraper 8532 are arranged alternately. Both the front scraper 8531 and the rear scraper 8532 have drainage holes 8533 on their blade surfaces. The front scraper 8531 is fixedly connected to the front end face of the vertical plate 859 fixed on the support plate 852 via a polyurethane block 858, and the rear scraper 8532 is fixedly connected to the rear end face of the vertical plate 859 via a polyurethane block 858. The polyurethane block 858 has a certain buffering effect, preventing the scraper assembly 853 from being suddenly impacted by thick mud in the reverse direction, which would affect the meshing assembly between the gear disk 857 and the gear track 82. The flow obstruction of the curved track shovel device 8 is achieved through the scraper assembly. The double scraper comb tooth design can not only clean the sludge, but also leave gaps to facilitate the flow of water. The gap space between the front and rear scrapers, the gap space between the comb teeth, and the drain hole 8533 all play the role of clearing the water flow and preventing the scraper assembly 853 from generating large waves during the pushing process.

[0066] In this embodiment, the agent spraying device 6 includes a high-pressure spray gun 61 equipped with a pressure regulating valve. The inlet of the high-pressure spray gun 61 is connected to the agent tank 63 via the agent pipeline 62. The high-pressure gas inlet of the high-pressure spray gun 61 is connected to the high-pressure gas chamber 65 via the gas pipeline 64. The outlet of the high-pressure spray gun 61 is connected to the atomizing nozzle. The high-pressure spray gun 61 is fixedly supported by a transverse support plate 66. The transverse support plate 66 adopts an adjustable angle structure and is connected to a vertical support 67 fixed on the stage-1 reaction ditch 51. The second agent spraying device 7 includes a high-pressure spray gun 71 equipped with a pressure regulating valve. The inlet of the high-pressure spray gun 71 is connected to the agent tank 73 via the agent pipeline 72. The high-pressure gas inlet of the high-pressure spray gun 71 is connected to the high-pressure gas chamber 75 via the gas pipeline 74. The outlet of the high-pressure spray gun 71 is connected to an atomizing nozzle. The high-pressure spray gun 71 is fixedly supported by a horizontal support plate 76, which is connected to a vertical support 77 on the stage two reaction ditch 52 using an adjustable angle structure. The agent spraying device is a mature existing technology. The atomizing nozzle can be a straight nozzle with an adjustable atomization area or a flat nozzle. The adjustable angle structure is used to adjust the spray angle of the atomizing nozzle. The structural design is diverse. In this embodiment, the angle adjustment is achieved by opening waist-shaped holes on the vertical support 67 and the vertical support 77, which is simple and practical.

[0067] This embodiment transforms the mixing of a full tank of wastewater into the mixing of N smaller portions of wastewater. During the wastewater flow, the agent is sprayed evenly in a mist onto each smaller portion. The natural flow of the wastewater allows the wastewater and agent to mix quickly and thoroughly, and the mixing reaction occurs during the wastewater flow process, thus advancing the entire wastewater treatment process. In this way, wastewater mixing is easily simplified, advanced, and thorough, resulting in high wastewater separation and sedimentation efficiency and clean and thorough wastewater purification.

[0068] This embodiment utilizes the energy carried by the natural flow of sewage, eliminating the need to consume other power sources such as large stirring paddles, making it very energy-efficient and economical, and with strong sustainable development capabilities.

[0069] In addition to making full use of the sewage flow time to shorten the reaction time, this embodiment also achieves the simultaneous occurrence of destabilization reaction and flocculation reaction during the process, further shortening the reaction time and significantly improving the separation and sedimentation efficiency of stone wastewater. The destabilization reaction and flocculation reaction are essentially carried out in two independent reaction vessels, and are achieved without increasing the plant area. There is no need for the traditional cumbersome and complicated process switching, which greatly reduces the labor intensity and error rate of workers. All reactions are natural, smooth and completed in one go.

[0070] This embodiment features a reasonable and compact spatial layout, high space utilization, easy system construction and implementation, no high-cost large-scale equipment investment, low implementation cost, and simple and economical daily system maintenance. It has strong social and economic benefits and is of great significance in the field of wastewater treatment technology, especially in the field of stone wastewater treatment technology.

[0071] Example 3

[0072] A wastewater treatment system is provided, wherein the wastewater treatment system of this embodiment applies the wastewater treatment method described in Embodiment 1 or Embodiment 2.

[0073] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. All equivalent variations and modifications made in accordance with the shape, structure, features, and spirit of the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A wastewater treatment method, characterized in that, Includes the following steps: S1. Construct a primary sedimentation tank, a secondary sedimentation tank, and a clear water tank. The primary sedimentation tank is connected to the secondary sedimentation tank, and the secondary sedimentation tank is connected to the clear water tank. S2. Construct a flow reaction channel between the primary sedimentation tank and the enterprise's wastewater discharge outlet, and install a water treatment agent solution spraying device on the flow reaction channel; In step S2, the flow reaction channel is erected above the primary sedimentation tank, and the effluent from the flow reaction channel falls into the sludge discharge area of ​​the primary sedimentation tank. The flow reaction channel includes at least one branch reaction channel with multiple S-shaped bends. The first part of the branch reaction channel is the first stage reaction channel, where the reaction occurring is the destabilization reaction of the stone wastewater. The second part is the second stage reaction channel, where the reaction occurring is the flocculation reaction of the stone wastewater. A spraying device is installed on the first stage reaction ditch to evenly spray the agent towards the sewage inlet of the first stage reaction ditch; The second-stage reaction ditch is equipped with a second-stage spray device that evenly sprays chemicals towards the sewage inlet of the second-stage reaction ditch. Behind the second-stage spray device, a curved track shovel device is installed to remove and obstruct the flow. The curved track shovel device includes a sliding contact line conductive rail fixed to the outer wall of the second-stage reaction ditch and aligned with the flow path of the second-stage reaction ditch; a gear track fixed to both sides of the second-stage reaction ditch and aligned with the flow path of the second-stage reaction ditch; and a sliding track fixed to both sides of the second-stage reaction ditch and aligned with the flow path of the second-stage reaction ditch. It also includes a shovel body with a protective cover, powered by a sliding contact line current collector that is electrically connected to the sliding contact line conductive rail. The shovel body includes a support plate that slides along the sliding track. A scraper assembly for scraping sludge and obstructing water flow is fixed at the lower end of the support plate. A controller and a power assembly are fixed above the support plate. The power assembly is connected to a drive shaft, and gear discs that mesh with the gear tracks are fixed at both ends of the drive shaft. The wastewater discharged from the enterprise's wastewater outlet is wastewater from stone processing. The agent sprayed by the first agent spraying device is a coagulant, and the agent sprayed by the second agent spraying device is a flocculant.

2. The wastewater treatment method according to claim 1, characterized in that: The coagulant is polyaluminum chloride, and the flocculant is polyacrylamide; there are two branch reaction channels, which are symmetrically arranged; a flow-blocking plate is also provided behind the spray device of the agent shown to prevent flow.

3. The wastewater treatment method according to claim 1, characterized in that: Each of the sliding tracks has sliding grooves on both sides; each of the support plates has a slider assembly that straddles the sliding track and is adapted to the sliding grooves on both sides.

4. The wastewater treatment method according to claim 3, characterized in that: Each slider assembly has two rows of slider groups, and each row of slider groups has two roller sliders, which are connected to the support plate via a connecting shaft.

5. The wastewater treatment method according to claim 1, characterized in that: The scraper assembly includes a front scraper and a rear scraper, both equipped with comb teeth. The rear scraper is located behind the front scraper, and the comb teeth of the front scraper and the rear scraper are arranged alternately. Both the front and rear scrapers have drainage holes on their blade surfaces. The front scraper is fixedly connected to the front end face of a vertical plate fixed on a support plate via a polyurethane block, and the rear scraper is fixedly connected to the rear end face of the vertical plate via a polyurethane block.

6. The wastewater treatment method according to claim 1, characterized in that: The agent spraying device includes a high-pressure spray gun equipped with a pressure regulating valve. The inlet of the high-pressure spray gun is connected to the agent tank via an agent pipeline. The high-pressure gas inlet of the high-pressure spray gun is connected to the high-pressure gas chamber via a gas pipeline. The outlet of the high-pressure spray gun is connected to an atomizing nozzle. The high-pressure spray gun is fixedly supported by a horizontal support plate. The horizontal support plate adopts an adjustable angle structure and is connected to a vertical support fixed on the stage-one reaction ditch. The second agent spraying device includes a high-pressure spray gun 2 equipped with a pressure regulating valve. The inlet of the high-pressure spray gun 2 is connected to the agent tank 2 via the agent pipeline 2. The high-pressure gas inlet of the high-pressure spray gun 2 is connected to the high-pressure gas chamber 2 via the gas pipeline 2. The outlet of the high-pressure spray gun 2 is connected to an atomizing nozzle. The high-pressure spray gun 2 is fixedly supported by a horizontal support plate 2. The horizontal support plate 2 adopts an adjustable angle structure and is connected to the vertical support 2 on the stage 2 reaction ditch.

7. The wastewater treatment method according to claim 1, characterized in that: The primary sedimentation tank is located in an area relatively far from the enterprise's wastewater discharge outlet. The secondary sedimentation tank and the clear water tank are sequentially arranged from the primary sedimentation tank to the enterprise's wastewater discharge outlet. A flow reaction channel is constructed above the primary sedimentation tank, the secondary sedimentation tank, and the clear water tank. The primary sedimentation tank is connected to the secondary sedimentation tank via an overflow outlet, and the secondary sedimentation tank is connected to the clear water tank via an overflow outlet. Both the primary and secondary sedimentation tanks are square, while the clear water tank is L-shaped. The outer contours of the primary, secondary, and clear water tanks are square. The clear water from the clear water tank is returned to the enterprise's production and processing area via a return pipe or discharged into a river.

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