Pretreatment system suitable for river dredging sediment abandoned water

Abstract

The utility model discloses a pretreatment system suitable for river dredging sediment abandoned water, which comprises a physical sedimentation system, a coagulating sedimentation system, a super-magnetic coagulating sedimentation system and an abandoned water return system, and the physical sedimentation system comprises a physical sedimentation tank; the coagulative precipitation system comprises a coagulative precipitation tank, and the coagulative precipitation tank is connected with a bottom mud treater through a bottom mud pipe; the super-magnetic coagulating sedimentation system comprises a flocculation basin, a clarification basin, a magnetic filter and a magnetic drum, the magnetic drum is communicated with a magnetic powder pipe, and the other end of the magnetic powder pipe is communicated with the flocculation basin; a sludge outlet of the clarification tank is communicated with a magnetic drum which is communicated with a sludge treater; the bottom mud treater is communicated with a dehydration water outlet pipe; the other end of the dehydration water outlet pipe is connected with the flocculation basin; the abandoned water backflow system comprises a supernatant pipe communicated with the physical sedimentation tank, and the other end of the supernatant pipe is communicated with the flocculation tank; the magnetic filter is communicated with a magnetic filtration water production pipe, and the other end of the magnetic filtration water production pipe is communicated with the flocculation basin. The device has the characteristics of simple and reliable process, short residence time, economy, feasibility and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of river channel regulation, and more particularly to a pretreatment system suitable for discarded water from river channel dredging. Background Art

[0002] River management projects often generate large amounts of sediment, which has a high water content and results in significant amounts of wastewater. Currently, river dredging sediment is typically simply aired before being landfilled, while wastewater is often simply collected and sedimented before being discharged directly into the river. During the airing process, some pollutants are released from the sludge, exacerbating the pollutants in the wastewater. Without systematic treatment, this can impact the ecological environment near the river.

[0003] Therefore, there is an urgent need for a pretreatment system suitable for river dredging sludge wastewater, which can deeply treat the sludge wastewater before entering the sewage treatment plant. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pretreatment system suitable for river dredging bottom mud and waste water, so as to solve the problems in the background technology.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0006] A pretreatment system suitable for discarded sludge from river dredging comprises a physical sedimentation system, a coagulation sedimentation system, a supermagnetic coagulation sedimentation system and a discarded water return system connected in sequence, wherein the physical sedimentation system comprises a physical sedimentation tank; the coagulation sedimentation system comprises a coagulation sedimentation tank, which is connected to a sludge processor via a sludge pipe; the supermagnetic coagulation sedimentation system comprises a flocculation tank, a clarification tank, a magnetic filter and a magnetic drum connected in sequence, the magnetic drum is connected to a magnetic powder tube, the other end of which is connected to the flocculation tank; the sludge outlet of the clarification tank is connected to the magnetic drum, which is connected to the sludge processor; the sludge processor is connected to a dewatering outlet pipe, the other end of which is connected to the flocculation tank, and the coagulation sedimentation tank is connected to the coagulation sedimentation tank; the discarded water return system comprises a supernatant pipe connected to the physical sedimentation tank, the other end of which is connected to the flocculation tank; the magnetic filter is connected to a magnetic filtration water production pipe, the other end of which is connected to the flocculation tank.

[0007] To further optimize the technical solution, a composite screen machine is set at the front section of the physical sedimentation tank.

[0008] To further optimize the technical solution, the water reflux ratios of the supernatant pipe, dehydration outlet pipe, magnetic filtration water production pipe, and magnetic powder pipe are 20%, 100%, 50%, and 100%, respectively.

[0009] To further optimize the technical solution, the sludge processor includes a homogenization tank, and the outlet of the homogenization tank is connected to the flocculation tank.

[0010] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is as follows.

[0011] This utility model provides a pretreatment system for riverbed sludge wastewater from dredging. It pretreats the wastewater through a physical sedimentation system, a coagulation sedimentation system, a supermagnetic coagulation sedimentation system, and a wastewater return system. The system has a treatment capacity of up to 10,000 tons of wastewater per day, with an effluent pH of 6-9, SS less than 70 mg / L, and phosphate less than 0.5 mg / L, achieving water quality that meets the requirements of general sewage treatment plants. This utility model features a simple and reliable process, a short residence time, and economic feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Among them: 1. Physical sedimentation system, 11. Physical sedimentation tank, 2. Coagulation sedimentation system, 21. Coagulation sedimentation tank, 22. Bottom sludge processor, 23. Dewatering outlet pipe, 3. Supermagnetic coagulation sedimentation system, 31. Flocculation tank, 32. Clarification tank, 33. Magnetic filter, 34. Magnetic drum, 4. Waste water return system, 41. Supernatant pipe, 43. Magnetic filtration water production pipe, 44. Magnetic powder tube. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] A pretreatment system for river dredging sediment wastewater, combined with Figure 1 As shown, it includes a physical sedimentation system 1, a coagulation sedimentation system 2, a supermagnetic coagulation sedimentation system 3, and a waste water return system 4. The physical sedimentation system 1 includes a physical sedimentation tank 11; the coagulation sedimentation system 2 includes a coagulation sedimentation tank 21, a sludge processor 22, and a dewatering outlet pipe 23; the supermagnetic coagulation sedimentation system 3 includes a flocculation tank 31, a clarification tank 32, a magnetic filter 33, and a magnetic drum 34; the waste water return system 4 includes a supernatant pipe 41, a dewatering outlet pipe 23, a magnetic filtration water production pipe 43, and a magnetic powder pipe 44.

[0016] The physical sedimentation system 1, the coagulation sedimentation system 2, the supermagnetic coagulation sedimentation system 3 and the waste water return system 4 are connected in sequence.

[0017] The physical sedimentation system 1 includes a physical sedimentation tank 11 . A composite screen machine is provided at the front section of the physical sedimentation tank 11 to remove impurities in the water and achieve solid-liquid separation.

[0018] The coagulation and sedimentation system 2 includes a coagulation and sedimentation tank 21, which is connected to a sediment processor 22 via a sediment pipe. The sediment processor 22 includes a homogenization tank. A high-powered mud pump pumps settled sludge into the homogenization tank, where chemicals are added and stirred to rapidly separate the sludge and water and agglomerate soil particles. The outlet of the homogenization tank is connected to a flocculation tank 31.

[0019] The super magnetic coagulation and sedimentation system 3 includes a flocculation tank 31, a clarification tank 32, a magnetic filter 33, and a magnetic drum 34, which are connected in sequence. The magnetic drum 34 is connected to a magnetic powder tube 44, the other end of which is connected to the flocculation tank 31. The sludge outlet of the clarification tank 32 is connected to the magnetic drum 34, which is in turn connected to the sludge processor. The sludge processor 22 is connected to a dewatering outlet pipe 23, the other end of which is connected to the flocculation tank 31. The coagulation and sedimentation tank 21 is also connected to the coagulation and sedimentation tank.

[0020] The magnetic powder in the magnetic powder tube 44 is flocculated and combined with the pollutants to form a high-density floc and increase the specific gravity of the floc, which can enhance the flocculation effect and improve the sedimentation efficiency. At the same time, the magnetic powder can be recycled through the magnetic drum 34.

[0021] The residence time of the entire process is very short. The magnetic powder and flocculant added to the super magnetic coagulation sedimentation system 3 have a good adsorption effect on TP, bacteria, viruses, oil and various tiny particles. Therefore, the removal effect of such pollutants is better than that of traditional processes.

[0022] The wastewater return system 4 includes a supernatant pipe 41 connected to the physical sedimentation tank 11, the other end of which is connected to the flocculation tank 31. A magnetic filtration water production pipe 43 is connected to the magnetic filter 33, the other end of which is connected to the flocculation tank 31. The water return ratios of the supernatant pipe 41, the dewatering outlet pipe 23, the magnetic filtration water production pipe 43, and the magnetic powder pipe 44 are 20%, 100%, 50%, and 100%, respectively.

[0023] In practical use, this utility model first passes the wastewater from the sludge through a physical sedimentation tank to remove impurities. A certain amount of coagulant (such as aluminum salts, iron salts, and polymer compounds) is then added to the coagulation and sedimentation tank. Through flocculation and sedimentation, the remaining water meets discharge standards, primarily removing SS and colloidal substances from the wastewater. Magnetic powder is added to the flocculation tank, where it flocculates and binds with the pollutants. This addition enhances the flocculation effect and improves sedimentation efficiency. The magnetic powder can also be recycled through magnetic tubes and drums. The entire process has a very short residence time. The magnetic powder and flocculant added to the system effectively adsorb TP, bacteria, viruses, oil, and various small particles. Suspended solids are then removed through a clarification tank, followed by a magnetic filter to remove magnetic substances from the water. Testing has shown that this pretreatment system can treat 10,000 tons of wastewater from the sludge daily, with an effluent pH of 6-9, SS less than 70 mg / L, and phosphate less than 0.5 mg / L, meeting the requirements for advanced treatment.

Claims

1. A pretreatment system for river dredging sediment wastewater, characterized by: The invention comprises a physical precipitation system (1), a coagulation precipitation system (2), a supermagnetic coagulation precipitation system (3) and a waste water return system (4) connected in sequence, wherein the physical precipitation system (1) comprises a physical precipitation tank (11); the coagulation precipitation system (2) comprises a coagulation precipitation tank (21), and the coagulation precipitation tank (21) is connected to a bottom sediment processor (22) via a bottom sediment pipe; the supermagnetic coagulation precipitation system (3) comprises a flocculation tank (31), a clarification tank (32), a magnetic filter (33), and a magnetic drum (34) connected in sequence, wherein the magnetic drum (34) is connected to a magnetic powder tube (44), and the other end of the magnetic powder tube (44) is connected to the flocculation tank (31); The sludge outlet of the clarifier (32) is connected to the magnetic drum (34), and the magnetic drum (34) is connected to the sludge processor; the bottom sludge processor (22) is connected to a dewatering outlet pipe (23), the other end of the dewatering outlet pipe (23) is connected to the flocculation tank (31), and the coagulation sedimentation tank (21) is connected to the coagulation sedimentation tank (21); the waste water return system (4) includes a supernatant pipe (41) connected to the physical sedimentation tank (11), and the other end of the supernatant pipe (41) is connected to the flocculation tank (31); the magnetic filter (33) is connected to a magnetic filtration water production pipe (43), and the other end of the magnetic filtration water production pipe (43) is connected to the flocculation tank (31).

2. A pretreatment system for waste water from river dredging according to claim 1, characterized in that: A composite screen machine is provided at the front section of the physical sedimentation tank (11).

3. A pretreatment system for waste water from river dredging according to claim 2, characterized in that: The water reflux ratios of the supernatant pipe (41), the dehydration outlet pipe (23), the magnetic filtration water production pipe (43), and the magnetic powder pipe (44) are 20%, 100%, 50%, and 100%, respectively.

4. A pretreatment system for waste water from river dredging according to claim 3, characterized in that: The bottom mud processor (22) comprises a homogenizing tank, and the outlet of the homogenizing tank is connected to the flocculation tank (31).

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