High-concentration dredging system for bottom mud of rivers and lakes

Abstract

The utility model discloses a high-concentration dredging system for river and lake bottom mud, which comprises a bottom mud conditioning pond, a dredging ship and a mud-water separation pond, the bottom mud conditioning pond is arranged at the upper end of the dredging ship, and a mud inlet of the bottom mud conditioning pond is connected with a pneumatic pump for pumping the river and lake bottom mud through a pipeline; a mud outlet of the bottom mud conditioning pond is communicated with a mud inlet of the mud-water separation pond through a mud conveying flow channel of a connecting pipe, and a water outlet of the mud-water separation pond is communicated with a liquid inlet of the bottom mud conditioning pond through a water conveying flow channel of the connecting pipe. According to the utility model, the bottom mud is pumped through the pneumatic pump, the solid content of the bottom mud reaches 30-50%, and by improving the solid content of the desilting slurry and reducing the total amount of the desilting slurry, the corresponding treatment scales of the subsequent solid-liquid separation unit and the sewage treatment unit are finally reduced, the sewage treatment cost is reduced, and the occupied area is reduced; and the supernate of the mud-water separation tank flows back to the bottom mud conditioning tank to adjust the solid content of the mud to 15-20%, so that the requirement of closed conveying of the pipeline is met.

Description

Technical Field

[0001] The utility model relates to the technical field of river and lake bottom mud desilting, in particular to a high-concentration river and lake bottom mud desilting system. Background Art

[0002] River and lake sediments are the "source" and "sink" of various types of pollution in water bodies. Under certain conditions, they will release deposited pollutants such as nitrogen, phosphorus, heavy metals and polycyclic aromatic hydrocarbons (PAHs) back into the water bodies, posing serious harm to the aquatic ecological environment and threatening human daily drinking water safety.

[0003] Environmental dredging is an important means of managing the sediments of urban rivers and lakes. By dredging the polluted sediments, endogenous pollutants that pollute the water body can be removed. Sediment dredging can completely remove pollutants from the water system, which can greatly reduce the contribution of sediment to the pollution of the overlying water body, and thus solve the secondary pollution caused by endogenous release under biological or physical effects. Dredging technologies include grab dredging, pump suction dredging and cutter suction dredging technologies. Among them, environmental cutter suction dredging technology uses a cutter suction dredger to turn the riverbed mud into slurry through operations such as auger rotation and cutting. Then, under the action of a centrifugal pump, the slurry is transported to a designated location on the shore through a fully enclosed pipeline along the slurry suction pipe for treatment. Due to the high degree of automation of this technology and the fully enclosed mud transportation, it can operate 24 hours a day without interruption. This technology is widely used in the field of environmental dredging. This technology transports mud through closed pipelines. Usually, the solid content of mud is 15-20%. Due to the low solid content and high water content of mud, after the mud and water are separated, the sludge is dehydrated. A large amount of residual water is generated during the whole treatment process, which needs to be treated, occupying a large area and having high treatment costs. How to reduce the amount of dredging and reduce the cost of dredging and sludge treatment is a problem that needs to be solved in the environmental protection dredging industry. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a high-concentration dredging system for river and lake bottom mud, reduce the total amount of dredging mud, and reduce the cost of dredging and sludge treatment.

[0005] According to the utility model, a high-concentration dredging system for river and lake bottom mud is proposed, which includes a bottom mud conditioning tank, a dredging ship and a mud-water separation tank. The bottom mud conditioning tank is arranged at the upper end of the dredging ship, and the mud inlet of the bottom mud conditioning tank is connected to a pneumatic pump for extracting river and lake bottom mud through a pipeline, the mud outlet of the bottom mud conditioning tank is communicated with the mud inlet of the mud-water separation tank through a mud conveying channel of a connecting pipe, a pressure pump is installed on the side of the bottom mud conditioning tank close to the connecting pipe, the water outlet of the mud-water separation tank is communicated with the liquid inlet of the bottom mud conditioning tank through the water conveying channel of the connecting pipe, and a reflux pump is installed at the water outlet of the mud-water separation tank.

[0006] Preferably, the connecting pipe floats on the upper end of the water surface through a buoy, and two groups of mud conveying channels and water conveying channels that do not interfere with each other are arranged inside the connecting pipe.

[0007] Preferably, the sediment conditioning tank is provided with an agitator for agitating water and sediment to reduce the solid content of the internal sludge.

[0008] Preferably, a ventilation pipe for discharging internal gas is installed at the upper end of the sludge conditioning tank.

[0009] Preferably, a sludge concentration meter for monitoring the solid content of the sludge is installed at the inner bottom of the sludge conditioning tank.

[0010] Preferably, a liquid level sensor for monitoring the liquid level is installed at the upper end of the interior of the sludge conditioning tank.

[0011] The beneficial effects of the utility model are:

[0012] (1) The bottom mud is extracted by pneumatic pump, and the solid content of the bottom mud reaches 30-50%. By increasing the solid content of the dredging sludge, the total amount of dredging sludge is reduced, and finally the subsequent solid-liquid separation unit and sewage treatment unit are reduced in size, sewage treatment costs are reduced, and the land area is reduced;

[0013] (2) A bottom mud conditioning tank is set up on the dredging ship to adjust the solid content of the mud to 15-20%. After being pressurized by a pressure pump, the mud is transported to the land mud-water separation tank through a mud pipe to meet the requirements of pipeline closed transportation;

[0014] (3) The supernatant from the mud-water separation tank is returned to the bottom mud conditioning tank to adjust the mud solid content to 15-20%, thereby reducing the water consumption in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the attached picture:

[0016] Figure 1 The utility model is a schematic structural diagram of a high-concentration river and lake bottom mud desilting system.

[0017] In the figure: 1- bottom mud, 2- air pump, 3- bottom mud conditioning tank, 4- dredging boat, 5- pressure pump, 6- mud conveying channel, 7- mud-water separation tank, 8- return pump, 9- water conveying channel, 10- float, 11- ventilation pipe, 12- liquid level sensor, 13- sludge concentration meter. DETAILED DESCRIPTION

[0018] Reference Figure 1A high-concentration dredging system for river and lake sediments comprises a sediment conditioning tank 3, a dredging ship 4 and a mud-water separation tank 7. The sediment conditioning tank 3 is arranged at the upper end of the dredging ship 4. The sediment inlet of the sediment conditioning tank 3 is connected to a pneumatic pump 2 for extracting river and lake sediment 1 through a pipeline. The sediment outlet of the sediment conditioning tank 3 is communicated with the sediment inlet of the mud-water separation tank 7 through a mud conveying channel 6 of a connecting pipe. A pressure pump 5 is installed on the side of the sediment conditioning tank 3 close to the connecting pipe. The water outlet of the mud-water separation tank 7 is communicated with the liquid inlet of the sediment conditioning tank 3 through a water conveying channel 9 of the connecting pipe. A reflux pump 8 is installed at the water outlet of the mud-water separation tank 7.

[0019] The connecting pipe floats on the upper end of the water surface through a float 10, and two groups of mud conveying channels 6 and water conveying channels 9 which do not interfere with each other are arranged inside the connecting pipe.

[0020] The interior of the sediment conditioning tank 3 is provided with an agitator for agitating water and sediment to reduce the solid content of the internal sludge.

[0021] A vent pipe 11 is installed at the upper end of the bottom mud conditioning tank 3 to discharge the internal gas.

[0022] A sludge concentration meter 13 for monitoring the solid content of the sludge is installed at the inner bottom of the sludge conditioning tank 3 .

[0023] A liquid level sensor 12 for monitoring the liquid level is installed at the upper end of the bottom mud conditioning tank 3 .

[0024] During operation, the pneumatic pump 2 is started to pump the river and lake bottom mud into the bottom mud conditioning tank 3, the reflux pump 8 is operated to inject water into the bottom mud conditioning tank 3, and the solid content of the mud is adjusted to 15-20%, and the booster pump 5 is operated, and the mud conditioned in the bottom mud conditioning tank 3 is transported to the mud-water separation tank 7 by the mud conveying channel 6 of the connecting pipe, and the mud is allowed to stand in the mud-water separation tank 7, and the upper clear liquid in the mud-water separation tank 7 is pumped back into the bottom mud conditioning tank 3 through the reflux pump 8 for recycling, thereby reducing the water consumption in the system, and at the same time, the sludge concentration meter 13 and the liquid level sensor 12 are used to monitor the solid content and liquid level of the mud in the bottom mud conditioning tank 3 in real time. The sludge concentration meter 13 and the liquid level sensor 12 in this system are both existing mature products, and do not involve structural improvements.

Claims

1. A high-concentration dredging system for river and lake sediments. Features: The invention comprises a sediment conditioning tank (3), a dredging vessel (4) and a mud-water separation tank (7). The sediment conditioning tank (3) is arranged at the upper end of the dredging vessel (4). The sediment inlet of the sediment conditioning tank (3) is connected to a pneumatic pump (2) for extracting river and lake sediment (1) through a pipeline. The sediment outlet of the sediment conditioning tank (3) is connected to the sediment inlet of the mud-water separation tank (7) through a mud conveying channel (6) of a connecting pipe. A pressure pump (5) is installed on the side of the sediment conditioning tank (3) close to the connecting pipe. The water outlet of the mud-water separation tank (7) is connected to the liquid inlet of the sediment conditioning tank (3) through a water conveying channel (9) of a connecting pipe. A reflux pump (8) is installed at the water outlet of the mud-water separation tank (7).

2. A high-concentration river and lake sediment desilting system according to claim 1, Features: The connecting pipe floats on the upper end of the water surface via a float (10), and two groups of mud conveying channels (6) and water conveying channels (9) which do not interfere with each other are arranged inside the connecting pipe.

3. A high-concentration river and lake sediment desilting system according to claim 1, Features: The bottom mud conditioning tank (3) is provided with a stirrer for stirring water and bottom mud so as to reduce the solid content of the mud inside.

4. A high-concentration river and lake sediment desilting system according to claim 1, Features: A vent pipe (11) for discharging internal gas is installed at the upper end of the bottom mud conditioning tank (3).

5. A high-concentration river and lake sediment desilting system according to claim 1, Features: A sludge concentration meter (13) for monitoring the solid content of the sludge is installed at the inner bottom of the sludge conditioning tank (3).

6. A high-concentration river and lake sediment desilting system according to claim 1, Features: A liquid level sensor (12) for monitoring the liquid level is installed at the upper end of the interior of the sediment conditioning tank (3).

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