CN202785919U - Heavy metal polluted sediment processing device for river courses and lakes - Google Patents

Abstract

The utility model provides a heavy metal polluted sediment processing device for river courses and lakes, which comprises a screening cylinder and a sludge dewatering machine, wherein the upper part of the screening cylinder is provided with a sediment inlet; the bottom surface of the screening cylinder is communicated with a feed port of the sludge dewatering machine; a gravel screen, a coarse sand screen and a fine sand screen are sequentially arranged in the screening cylinder from top to bottom; the positions on the side surface of the cylinder, corresponding to the three screens, are respectively provided with a discharge port; the mesh diameters of the gravel screen, the coarse sand screen and the fine sand screen are respectively 10 mm, 2 mm and 0.5 mm; and the gravel screen, the coarse sand screen and the fine sand screen are inclined in the screening cylinder. According to the utility model, sucked and dredged heavy metal polluted sediment from river courses and lakes are directly subjected to stage treatment without being dried, thereby achieving a short treatment period; the screening process is realized completely by means of gravity, and the general solid screening process is not required; the high water content can effectively prevent screen blockage; and the treatment cost is low.

Description

The treatment unit of river and lake heavy metal polluted bed mud

Technical field

The utility model relates to a kind of for the treatment unit to river, lake heavy metal polluted bed mud, belongs to the heavy metal polluted bed mud processing technology field.

Background technology

Heavy metal is the principal pollutant in river, the bottom mud in lake, deposit in the bed mud by effects such as absorption, complexing, precipitations, the simultaneously running balance certain with the water maintenance is when envrionment conditions changes, heavy metal enters water body very easily again, becomes secondary pollution.The heavy metal environmental pollutant are persistent pollutant, in case entered environment just will retain in environment lastingly.Heavy metal in the bed mud can produce water body and pollute, the bottom-dwelling in harm river, and toxicity is very large and can accumulate transmission, the serious threat mankind's living environment and health in food chain.Sediment pollution is the important research content of water pollution, also is one of worldwide outstanding environmental problem.

At present, the method that the removal of heavy metal in the bed mud is mainly adopted has in-situ treatment and dystopy to process.In-situ treatment comprises physics reparation, chemistry reparation and biological restoration three major types.And the original position physics reparation means such as shelter commonly used can raising of water level, and the water body storage capacity is reduced, and does not therefore generally use at water bodys such as river, lakes.The in-situ chemical reparation makes stable the remaining in the settling of pollutent in the water body by add chemical agent in water body, but the chemical agent that adds in the water body can affect water quality after reaching finite concentration.Dystopy is processed bed mud after processing and referring to bed mud in river dredged again, and usually conduct is more thorough, and reparation speed is fast, therefore, for being subject to the more serious river of trade effluent and sanitary sewage impact, it is necessary selection that bed mud is dredged.

Usually, in heavy metal polluted bed mud dystopy treating processes, contaminated bed mud is dredged out from river course or lake, after the mummification, perhaps directly added the heavy metal fixing agent and fix, perhaps drip washing is processed.Chinese patent literature CN102372406A also discloses a kind of " the showering method of heavy metal polluted bed mud ", and the method is mainly by sediment digging and conveying, the antiseepage of reparation district and draining, bed mud modifying agent with microbial strains adds, microorganism and plant combined reparation, wastewater treatment and plant harvesting and incineration disposal unit form; Concrete steps are that addressing and the antiseepage of repairing first the district are processed, adopt again engineering method that heavy metal polluted bed mud is dredged and is transported to and repair the district, then carry out the discharging consolidation process of bed mud, then adding bed mud modifying agent and microbial strains fully mixes with bed mud and cultivates plant, after gathering at last plant and it being burned, be transported to the hazardous waste landfill landfill or be used for the recovery heavy metal element burning ash.The method is processed dystopy and is combined with the plant based technique for in-situ remediation, and adds fixing agent or employing drip washing is compared, and has reduced to a certain extent the processing disposal costs.All there is very large defective in above method: and for heavy metal, it mainly is adsorbed on the less particulate matter surface of particle diameter usually, if the bed mud that dredging is come up all directly adds the processing of heavy metal fixing agent afterwards as dangerous solid wastes disposing, because volume is large, its processing cost is higher; If the direct drip washing of dredging bed mud also can cause treatment unit, medicament, equipment and place waste, and a large amount of leacheates processing disposal costs that produce are also higher.Usually in municipal effluent plant excess sludge treating processes, for satisfying the requirement of composting, also mud is sieved, but its screening process normally carries out behind sludge drying, if river course, lake heavy metal polluted bed mud also sieve processing after mummification, because river course, the common volume of lake pollution bed mud are larger, adopt " first mummification+rear screening " treatment process of municipal effluent plant excess sludge, normally unpractical.

Therefore, demand developing the low investment for river course, lake heavy metal polluted bed mud, the low efficient processing disposal technology of runing old urgently.

Summary of the invention

Carry out the deficiency that the dystopy treatment technology exists for existing to dredging rear heavy metal polluted bed mud, the utility model provides a kind for the treatment of unit of processing thorough, effective river and lake heavy metal polluted bed mud.

The treatment unit of river and lake heavy metal polluted bed mud of the present utility model, by the following technical solutions:

This treatment unit, comprise screening cylindrical shell and sludge dewatering equipment, the top of screening cylindrical shell is provided with the bed mud import, the bottom surface of screening cylindrical shell is communicated with the opening for feed of sludge dewatering equipment, be disposed with from top to bottom rock screen subnetting, coarse sand Screening Network and fine-screen shaker subnetting in the screening cylindrical shell, corresponding three Screening Network places, the side of cylindrical shell are provided with respectively discharge port, the mesh diameter of rock screen subnetting, coarse sand Screening Network and fine-screen shaker subnetting is respectively 10mm, 2mm and 0.5mm, and rock screen subnetting, coarse sand Screening Network and fine-screen shaker subnetting are inclined in the screening cylindrical shell.

The bed mud that the utility model will twist the river and lake heavy metal contamination of inhaling dredging directly carries out stage treatment, need not mummification, treatment cycle is short, screening process relies on utilize gravity to realize fully, need not as (shaking-sieving, the water body screening of solid screening process, the additive decrementation energy), and higher water ratio can effectively prevent clogging of screen.After screening, it is significantly less to process the bed mud amount of disposing as dangerous solid waste, can reduce the heavy metal polluted bed mud of about 60%-90% and process disposal costs.Saving equipment and investment significantly reduce the ﹠ Mud cost.

Description of drawings

Fig. 1 is the structural representation of the treatment unit of the utility model river and lake heavy metal polluted bed mud.

Wherein: 1, screening cylindrical shell, 2, the bed mud import, 3, the rock screen subnetting, 4, the rubble discharge port, 5, the coarse sand Screening Network, 6, the coarse sand discharge port, 7, the fine-screen shaker subnetting, 8, the fine sand discharge port, 9, sludge dewatering equipment.

Embodiment

Fig. 1 has provided the structure of the treatment unit of the river and lake heavy metal polluted bed mud in the utility model, mainly comprise screening cylindrical shell 1 and sludge dewatering equipment 9, the top of screening cylindrical shell 1 is provided with bed mud import 2, and the bottom surface of screening cylindrical shell 1 is communicated with the opening for feed of sludge dewatering equipment 9.Be disposed with from top to bottom rock screen subnetting 3, coarse sand Screening Network 5 and fine-screen shaker subnetting 7 in the screening cylindrical shell 1, corresponding three Screening Network places, the side of cylindrical shell 1 are provided with respectively rubble discharge port 4, coarse sand discharge port 6 and fine sand discharge port 8.All inclined with respect to the axis of screening cylindrical shell 1 in screening cylindrical shell 1 to rock screen subnetting 3, coarse sand Screening Network 5 and fine-screen shaker subnetting 7, be beneficial to like this solid particulate by discharging by deadweight in the screening cylindrical shell 1.The angle of inclination is not more than 30 degree.For each discharge port is not disturbed, coarse sand Screening Network 5 is different from the vergence direction of rock screen subnetting 3 and fine-screen shaker subnetting 7.The mesh of rock screen subnetting 3 is 10mm, and the mesh diameter of coarse sand Screening Network 5 is 2mm, and the mesh diameter of fine-screen shaker subnetting 7 is 0.5mm.

The treatment unit of above-mentioned river and lake heavy metal polluted bed mud is as described below to the treating processes of heavy metal polluted bed mud.

Directly be transported in the treatment unit shown in Figure 1 on bank by pipeline from river course or lake by the bed mud of strand suction sand dredger with heavy metal contamination, bed mud is entered by the bed mud import 2 on screening cylindrical shell 1 top, then successively fallen by rock screen subnetting 3, coarse sand Screening Network 5 and fine-screen shaker subnetting 7, each Screening Network vibrator thereon drives lower vibration, and bed mud is sieved.Particle diameter is tackled by rock screen subnetting 3 greater than the rubble of 10mm, and is discharged by rubble discharge port 4 corresponding to rock screen subnetting 3 places.Particle diameter is that the coarse sand of 2mm-10mm is tackled by coarse sand Screening Network 5, and is discharged by discharge port corresponding to coarse sand Screening Network 5 places.Particle diameter is that the fine sand of 0.5mm-2mm is tackled by fine-screen shaker subnetting 7, and is discharged by discharge port corresponding to fine-screen shaker subnetting 7 places.Contain in the sludge dewatering equipment 9 that enters bottom of device after particle diameter is fallen by fine-screen shaker subnetting 7 less than the mixed solution of 0.5mm clay and carry out processed, discharge particle diameters less than the clay of 0.5mm and dehydration liquid by sludge dewatering equipment 9 after processing.Add the heavy metal adsorption medicament in dehydration liquid, by the sedimentation removal heavy metal, supernatant liquor enters water body, delivers to dangerous Solid Waste Landfills after the throw out dehydration and disposes.The solids such as clay, fine sand, coarse sand and rubble to the different-grain diameter that sieves out carry out respectively subsequent disposal.

Claims (1)

1. the treatment unit of a river and lake heavy metal polluted bed mud, comprise screening cylindrical shell and sludge dewatering equipment, it is characterized in that: the top of screening cylindrical shell is provided with the bed mud import, the bottom surface of screening cylindrical shell is communicated with the opening for feed of sludge dewatering equipment, be disposed with from top to bottom the rock screen subnetting in the screening cylindrical shell, coarse sand Screening Network and fine-screen shaker subnetting, corresponding three Screening Network places, the side of cylindrical shell are provided with respectively discharge port, the rock screen subnetting, the mesh diameter of coarse sand Screening Network and fine-screen shaker subnetting is respectively 10mm, 2mm and 0.5mm, the rock screen subnetting, coarse sand Screening Network and fine-screen shaker subnetting are inclined in the screening cylindrical shell.