Feed water pretreatment sludge water recycling system
By using a water pretreatment and sludge wastewater recycling system, the problems of sludge wastewater increasing the burden on the rainwater system and wasting water resources have been solved. This system enables the reuse of sludge wastewater, reduces the burden on the system, and ensures the implementation of environmental protection targets.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-03-13
AI Technical Summary
The sludge from the water pretreatment device is directly discharged into the rainwater pipe network, which increases the burden on the rainwater system, makes it difficult to meet environmental protection standards, and wastes water resources.
A water supply pretreatment sludge water recycling system was designed, including a sludge water collection tank, a pneumatic wastewater lift pump, a sludge thickening tank, and a supernatant return pipe. The turbidity is reduced through flocculation and sedimentation process and the supernatant is returned to the water supply pretreatment device. After sludge thickening, it is discharged into the rainwater pipe network at regular intervals.
It enables the reuse of sludge water, reduces the burden on the rainwater system, saves water resources, ensures compliance with environmental protection standards, and reduces operating costs and employee workload.
Smart Images
Figure CN223990976U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater resource reuse technology, and in particular to a water supply pretreatment sludge water recycling system. Background Technology
[0002] Currently, water pretreatment devices use coagulation and sedimentation processes to reduce turbidity in surface water. The sedimentation tank regularly discharges sludge directly into the rainwater pipe network. This sludge discharge contains a large amount of suspended solids, increasing the burden on the rainwater system and leading to increased pressure on rainwater turbidity reduction and discharge, which is not conducive to meeting the environmental protection standards for external drainage. Utility Model Content
[0003] The purpose of this invention is to provide a water pretreatment sludge discharge water recycling system to solve the aforementioned problems in the prior art.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A water supply pretreatment sludge wastewater recycling system includes a sludge wastewater collection tank, a pneumatic wastewater lift pump, a sludge thickening tank, and a supernatant return pipe. The water supply pretreatment unit is connected to the sludge wastewater collection tank to transport the generated sludge wastewater to the collection tank. The sludge wastewater collection tank is connected to the sludge thickening tank via the pneumatic wastewater lift pump to transport the sludge wastewater to the sludge thickening tank. The sludge thickening tank is connected to the water supply pretreatment unit via the supernatant return pipe to transport the supernatant generated after sludge wastewater thickening and sedimentation back to the water supply pretreatment unit. The sludge thickening tank is connected to a rainwater pipe network to discharge the sludge generated after sludge wastewater thickening and sedimentation into the rainwater pipe network.
[0006] Preferably, a sludge discharge valve is installed on the connecting pipe between the sludge thickening tank and the rainwater pipe network.
[0007] Preferably, the water pretreatment device includes a mixed flocculation sedimentation tank A and a mixed flocculation sedimentation tank B. The South-to-North Water Diversion Water and the Yanma Water are both connected to the mixed flocculation sedimentation tank A and the mixed flocculation sedimentation tank B through pipelines, so as to reduce the turbidity of the South-to-North Water Diversion Water and the Yanma Water to a preset range through the flocculation sedimentation process. The mixed flocculation sedimentation tank A and the mixed flocculation sedimentation tank B are both connected to the sludge discharge water collection tank, so as to transport the sludge discharge water generated therefrom to the sludge discharge water collection tank.
[0008] Preferably, the supernatant return pipe is connected to the mixing flocculation sedimentation tank A to transport the supernatant generated after the sludge discharge water is concentrated and precipitated back to the mixing flocculation sedimentation tank A.
[0009] The beneficial effects of this utility model are: it solves the problems of increased rainwater system treatment burden, adverse environmental protection target implementation and water waste caused by sludge discharge from water pretreatment devices, realizes resource reuse of sludge wastewater, saves water resources, reduces the burden on downstream systems and ensures the implementation of environmental protection targets. Attached Figure Description
[0010] Figure 1 This is a structural diagram of the recycling system in an embodiment of this utility model.
[0011] In the diagram: 1-South-to-North Water Diversion Water, 2-Yanma Water, 3-Mixed Flocculation Sedimentation Tank A, 4-Mixed Flocculation Sedimentation Tank B, 5-Sludge Discharge Water, 6-Sludge Discharge Water Collection Tank, 7-Pneumatic Wastewater Lifting Pump, 8-Sludge Thickening Tank, 9-Supernatant Return Pipe, 10-Sludge Discharge Valve, 11-Rainwater Pipeline. Detailed Implementation
[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.
[0013] like Figure 1 As shown in this embodiment, a water supply pretreatment sludge wastewater recycling system is provided, including a sludge wastewater collection tank 6, a pneumatic wastewater lift pump 7, a sludge thickening tank 8, and a supernatant return pipe 9. The water supply pretreatment device is connected to the sludge wastewater collection tank 6 and has transported the sludge wastewater 5 it generates to the sludge wastewater collection tank 6. The sludge wastewater collection tank 6 is connected to the sludge thickening tank 8 via the pneumatic wastewater lift pump 7 to transport the sludge wastewater 5 to the sludge thickening tank 8. The sludge thickening tank 8 is connected to the water supply pretreatment device via the supernatant return pipe 9 to transport the supernatant generated after the sludge wastewater 5 is concentrated and settled back to the water supply pretreatment device. The sludge thickening tank 8 is connected to the rainwater pipe network 11 to discharge the sludge generated after the sludge wastewater 5 is concentrated and settled into the rainwater pipe network 11.
[0014] A sludge discharge valve 10 is installed on the connecting pipe between the sludge thickening tank 8 and the rainwater pipe network 11. The sludge discharge valve 10 is automatically opened and closed by a PLC control system, thereby intermittently discharging the sludge generated after thickening and sedimentation into the rainwater pipe network 11.
[0015] In this embodiment, the water pretreatment device includes a mixed flocculation sedimentation tank A3 and a mixed flocculation sedimentation tank B4. Water from the South-to-North Water Diversion Project 1 and water from Yanma 2 are both connected to the mixed flocculation sedimentation tanks A3 and B4 via pipelines to reduce the turbidity of the water to a preset range through a flocculation sedimentation process. Both the mixed flocculation sedimentation tanks A3 and B4 are connected to the sludge discharge collection tank 6 to transport the generated sludge discharge water 5 to the sludge discharge collection tank 6. The supernatant return pipe 9 is connected to the mixed flocculation sedimentation tank A3 to return the supernatant generated after the sludge discharge water 5 has been concentrated and precipitated to the mixed flocculation sedimentation tank A3.
[0016] In this embodiment, the original water pretreatment sludge disposal process is as follows: the water pretreatment device uses mixed flocculation sedimentation tank A3 and mixed flocculation sedimentation tank B4 to reduce the turbidity of South-to-North Water Diversion Water 1 and Yanma Water 2 to below 3 NTU for production use. While reducing turbidity, the sludge at the bottom of mixed flocculation sedimentation tank A3 and mixed flocculation sedimentation tank B4 needs to be discharged regularly, with a sludge discharge volume of approximately 40 m³. 3 The discharged mud and water mixture directly enters the rainwater pipe network 11, causing waste, increasing the turbidity of the rainwater pipe network 11, increasing the operating load of the external drainage treatment device, and affecting the quality of the external drainage water.
[0017] To recycle and reuse sludge discharge water, a sludge discharge water recycling system was constructed. This system is an auxiliary device to the water pretreatment unit, which employs a coagulation sedimentation process. The influent source is surface water from the Yanma Reservoir. The sedimentation tanks are a two-unit complex, with a total treatment capacity of approximately 1400 m³. 3 / h, each group is equipped with 9 sludge discharge pipes, which can be controlled by PLC to discharge sludge at timed intervals, with a sludge discharge capacity of approximately 40m³. 3 / h.
[0018] After the water supply pretreatment sludge recycling system is built and put into operation: the water supply pretreatment unit uses mixed flocculation sedimentation tank A3 and mixed flocculation sedimentation tank B4 to reduce the turbidity of South-to-North Water Diversion Water 1 and Yanma Water 2 to below 3 NTU through flocculation sedimentation process for production use. While reducing turbidity, the sludge at the bottom of mixed flocculation sedimentation tanks A3 and B4 needs to be discharged regularly, with a sludge discharge volume of approximately 40 m³. 3 The discharged mud-water mixture enters the sludge collection tank 6. A pneumatic wastewater lift pump 7 then pumps the sludge 5 to the sludge thickening tank 8. In the sludge thickening tank 8, the sludge 5 is concentrated and settled by a central rotating scraper. The supernatant then flows back by gravity to the inlet of the mixing flocculation sedimentation tank A3. The supernatant recovery rate is >95%, reducing raw water consumption. A PLC system controls the sludge discharge valve 10 to intermittently discharge the concentrated sludge into the rainwater pipe network 11, where it is then collected along with other production wastewater and sent to an external drainage treatment device for further processing.
[0019] By constructing a water supply pretreatment and sludge wastewater recycling system, approximately 288,000 m³ of water can be saved annually. 3 This will save approximately 691,200 yuan in water costs. It can reduce the operating load of the external wastewater treatment equipment, decrease operating pressure, reduce operating costs and employee workload, and facilitate the achievement of environmental protection standards for external wastewater. It also reduces the total amount of raw water used and water consumption per unit of product, creating favorable conditions for the improvement and certification of energy and quality management systems.
[0020] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:
[0021] This utility model provides a water supply pretreatment sludge discharge water recycling system, which solves the problems of increased rainwater system treatment burden, adverse environmental protection target implementation and water waste caused by sludge discharge water from water supply pretreatment devices. It realizes the resource reuse of sludge discharge wastewater, saves water resources, reduces the burden on downstream systems and ensures the implementation of environmental protection targets.
[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A water supply pretreatment sludge water recycling system, characterized by: The sludge water collecting tank, the pneumatic wastewater lifting pump, the sludge concentration tank and the supernatant backflow pipe; the water pretreatment device is connected with the sludge water collecting tank, and the sludge water generated by the water pretreatment device is transported to the sludge water collecting tank; the sludge water collecting tank is connected with the sludge concentration tank through the pneumatic wastewater lifting pump, so as to transport the sludge water to the sludge concentration tank; the sludge concentration tank is connected with the water pretreatment device through the supernatant backflow pipe, so as to transport the supernatant generated after the sludge water is concentrated and precipitated back to the water pretreatment device; The sludge concentration tank is connected with the rainwater pipe network, so as to discharge the sludge generated after the sludge water is concentrated and precipitated into the rainwater pipe network.
2. The water pretreatment sludge water recycling system according to claim 1, characterized by: A sludge valve is arranged on the connecting pipeline between the sludge concentration tank and the rainwater pipe network.
3. The water pretreatment sludge water recycling system of claim 1, wherein: A central rotating sludge scraper is arranged in the sludge concentration tank.
4. The water pretreatment sludge water recycling system of claim 1, wherein: The water pretreatment device comprises a mixed flocculation and precipitation tank A and a mixed flocculation and precipitation tank B, and the South-to-North Water Diversion water and the Yannan water are connected with the mixed flocculation and precipitation tank A and the mixed flocculation and precipitation tank B through pipelines, so as to reduce the turbidity of the South-to-North Water Diversion water and the Yannan water to a preset range through the slow flocculation and precipitation process; the mixed flocculation and precipitation tank A and the mixed flocculation and precipitation tank B are connected with the sludge water collecting tank, so as to transport the sludge water generated by the mixed flocculation and precipitation tank A and the mixed flocculation and precipitation tank B to the sludge water collecting tank.
5. The water pretreatment sludge water recycling system of claim 4, wherein: The supernatant backflow pipe is connected with the mixed flocculation and precipitation tank A, so as to transport the supernatant generated after the sludge water is concentrated and precipitated back to the mixed flocculation and precipitation tank A.