CN208250140U - A kind of river and lake pool gushes bed mud deep-graded processing system - Google Patents

Abstract

The utility model relates to a classification treatment system for river and lake bottom mud depth, which mainly solves the problems of indiscrimination and blindness in the current dredging bottom mud treatment and disposal work, and can better realize the reduction and resource utilization goals of bottom mud treatment , and create certain economic benefits. It is characterized in that: the whole system is divided into three modules: sediment transportation, depth classification and mechanical dehydration; the sediment transportation module is composed of dredging cofferdam, sediment mixer and submersible suction pump; the depth classification module is composed of high frequency vibrating screen, high Frequency dehydration screen, primary adjustment tank, primary cyclone, secondary adjustment tank, secondary cyclone and third-level adjustment tank; mechanical dehydration module consists of underflow sedimentation tank, overflow sedimentation tank, stabilizer dissolving device , flocculant dissolving device, high-pressure filter press equipment and tail water treatment equipment; after being treated, the dredged sediment is deeply separated into three parts with different organic matter or heavy metal content, and different resource utilization methods are adopted respectively. While effectively reducing the treatment cost, the full utilization of various beneficial components in the sediment can be realized.

Description

Depth classification treatment system for river and lake bottom sediment

technical field

The utility model relates to the improvement of river and lake bottom mud treatment facilities, in particular to a river and lake bottom mud depth classification treatment system, which belongs to the technical field of environmental protection.

Background technique

The black and smelly water in rivers and lakes not only brings extremely poor sensory experience to residents, but also a prominent water environment problem that directly affects the production and life of the masses. The "Water Pollution Prevention and Control Action Plan" promulgated by the State Council clearly stated that "by 2020, black and odorous water bodies in urban built-up areas at the prefecture level and above will be controlled within 10%, and by 2030, black and odorous water bodies in urban built-up areas will be eliminated in general." sexual target. Sediment, as an important part of the river and lake ecosystem, is not only the central link in the nutrient cycle of the water body, but also the main accumulation pool of nutrients, persistent organic pollutants, and heavy metals. important internal sources. As an important part of the comprehensive pollution control system of river and lake gushing water, sediment treatment is receiving more and more attention.

Sediment dredging can completely remove pollutants from the water system, thereby greatly improving water quality, improving water safety, promoting ecosystem restoration, and avoiding the release of endogenous pollutants to the overlying water body. Wide range of applications. However, the traditional dredging sediment treatment and disposal technology is too extensive, and adopts indiscriminate treatment methods for sediment particles with different particle sizes, different organic matter and heavy metal pollutant contents, resulting in a single outlet for sediment products and a huge output, which causes Deal with a series of problems such as increased energy consumption, waste of renewable resources, occupation of land resources, and increased secondary pollution. Previous studies have shown that organic matter and heavy metal pollutants are mainly concentrated in fine sediment particles, and their content is relatively low in coarse particles with a relatively dense structure. Therefore, different particle sizes of sediment particles correspond to different optimal treatment methods . To sum up, it is of great significance to develop a reduction and classification treatment facility for dredged sediment from rivers and lakes with the content of organic matter or heavy metal pollutants as the main index.

Contents of the invention

In order to solve the technical problems raised in the background technology, the utility model provides a low-cost, stable operation, convenient construction, and flexible operation of river and lake sediment depth classification treatment system.

A river and lake bottom sediment depth classification treatment system, characterized in that:

It consists of dredging cofferdam, sediment mixer, submersible dredge pump, high-frequency vibrating screen, high-frequency dewatering screen, primary adjustment tank, bottom flow outlet of primary cyclone, bottom flow secondary adjustment pool, bottom flow secondary cyclone The flow device, the bottom flow sedimentation tank and the bottom flow high-pressure filter press equipment are connected in series in sequence, and the drug outlets of the flocculant drug dissolving device and the stabilizer drug dissolving device are connected to the drug feeding port of the bottom flow sedimentation tank.

Compared with existing facilities, the utility model has the following beneficial effects:

1. It can separate the original sediment into three parts, and adopt targeted resource utilization methods according to the different organic matter contents, so that various beneficial components in the sediment can be fully recovered, and the economic and social benefits are remarkable improve.

2. The sand and gravel part with low pollutant content in the sediment is treated by simple leaching, which effectively reduces the operating cost of the sediment treatment system.

3. The system occupies a small area, is convenient to move, can operate continuously and stably, has a large amount of sediment treatment, and the dewatered cake can be directly transported outside, thus saving a lot of land resources.

4. The dehydrated cake produced by the system has high stability and low moisture content, which is convenient for transportation. At the same time, the tail water is effectively purified, thus significantly reducing the risk of secondary pollution.

Description of drawings:

Fig. 1 is a schematic diagram of the structure of a river and lake bottom sediment depth classification treatment system.

Detailed ways:

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described.

It consists of dredging cofferdam, sediment mixer, submersible dredge pump, high-frequency vibrating screen, high-frequency dewatering screen, primary adjustment tank, bottom flow outlet of primary cyclone, bottom flow secondary adjustment pool, bottom flow secondary cyclone The flow device, the bottom flow sedimentation tank and the bottom flow high-pressure filter press equipment are connected in series in sequence, and the drug outlets of the flocculant drug dissolving device and the stabilizer drug dissolving device are connected to the drug feeding port of the bottom flow sedimentation tank.

The overflow outlet of the primary cyclone, the overflow secondary adjustment tank, the overflow secondary cyclone and the overflow third-level adjustment tank are connected in series in sequence, the outlet of the overflow third-level adjustment tank is connected to the dredging cofferdam, and the overflow The overflow outlets of the two secondary cyclones of bottom flow and bottom flow are connected to the overflow sedimentation tank, and the outlet of the overflow sedimentation tank is connected to the overflow high-pressure filter press equipment, the drug outlet of the flocculant drug dissolving device and the stabilizer drug dissolving device Connected to the dosing port of the overflow sedimentation tank.

The high-frequency vibrating screen adopts a linear vibrating screen. All conditioning tanks are equipped with mud agitators and mud pumps. The stabilizer drug dissolving device uses EDTA as a drug. The flocculant drug-dissolving device uses PAM and PAC as agents. All high pressure filter press equipment adopts plate and frame filter press. Tail water treatment equipment uses conventional magnetic separation technology for tail water purification.

The specific implementation process of the above-mentioned system for the depth-grading treatment of river and lake bottom sediment is as follows.

(a) First, carry out laboratory and pilot test research on the basic characteristics of the sediment of the target water body, grasp the particle size distribution of the original sediment and the content of organic matter and heavy metal pollutants in particles of different particle sizes, and determine the classification particle size and Performance parameters of supporting equipment.

(b) Select the range of the river section to be treated, and build dredging cofferdams 1 with materials such as river sediment and other gravels to isolate the river section to be treated from the surrounding waters.

(c) Pump out part of the water in the dredging cofferdam 1, so that the remaining water and bottom mud can be mixed by the bottom mud mixer 2 to form the original mud with a solid content of 3-8%.

(d) The original mud is transported to the high-frequency vibrating screen by the submersible dredge pump, and the sand with a particle size greater than 1mm is screened out after being washed by the stabilizer; the sand on the screen enters the high-frequency dewatering screen 5 for dehydration, and then It is directly transported out of the closed transport vehicle and recycled as building materials.

(e) The mud after removal of sand and gravel enters the primary adjustment tank, and after being evenly stirred by the supporting mud mixer, it is transported to the primary cyclone by the supporting mud pump; the primary cyclone initially separates the mud into organic matter content Lower primary underflow and primary overflow with higher organic matter content.

(f) Bottom flow part: the primary bottom flow enters the secondary adjustment tank. Since the solid content of the primary bottom flow is relatively high, it is necessary to add a part of clean water from the tail water treatment equipment to the secondary adjustment tank to make the mud solid content in the tank Maintain within the range of 3~8%; the primary bottom flow in the secondary adjustment tank is evenly stirred by the supporting mud mixer, and then sent to the secondary cyclone by the supporting mud pump; the secondary cyclone converts the primary bottom flow It is further separated into secondary underflow with lower organic matter content and secondary overflow with organic matter content close to or higher than primary overflow, wherein the secondary underflow enters the underflow sedimentation tank, and the secondary overflow enters the overflow sedimentation tank.

(g) Overflow part: the first-level overflow enters the second-level adjustment tank, and after being evenly stirred by the supporting mud mixer, it is transported to the second-level cyclone by the supporting mud pump; It is further separated into secondary overflow with higher organic matter content and secondary underflow with organic matter content close to that of the original mud. The secondary overflow enters the overflow sedimentation tank, and the secondary underflow enters the tertiary adjustment tank.

(h) After the mud in the overflow three-stage adjustment tank is evenly stirred by the supporting mud mixer, it is transported back to the dredging cofferdam by the supporting mud pump for circular separation.

(i) The stabilizer dissolving device continuously transports the prepared stabilizing agent solution to the high-frequency vibrating screen, underflow sedimentation tank and overflow sedimentation tank; the flocculant dissolving device continuously transports the prepared flocculation agent solution to the underflow sedimentation tank and overflow sedimentation tanks.

(j) In the bottom flow sedimentation tank and the overflow sedimentation tank, the mud particles complete gel breaking, destabilization, agglomeration, coagulation, flocculation and sedimentation, thereby achieving a significant improvement in dehydration performance and preliminary solid-liquid separation.

(k) The concentrated mud from the underflow sedimentation tank and the overflow sedimentation tank enters two high-pressure filter presses for mechanical dehydration, and the dehydrated mud cakes are transported by closed transport vehicles to their respective final disposal sites, which are used as building materials and compost respectively. Raw materials are used as resources.

Claims (2)

1. A river and lake gushing bottom mud depth classification treatment system is characterized in that: it includes a dredging cofferdam, a bottom mud mixer, a submersible dredge pump, a high-frequency vibrating screen, a high-frequency dewatering screen, a primary adjustment tank, a The bottom flow outlet of the first-stage cyclone, the bottom flow secondary adjustment tank, the bottom flow secondary cyclone, the bottom flow sedimentation tank and the bottom flow high-pressure filter equipment are connected in series in sequence, and the drug outlets of the flocculant dissolving device and the stabilizer dissolving device are connected Dosing port in the bottom flow sedimentation tank. 2. The system according to claim 1, characterized in that: the overflow outlet of the primary cyclone, the overflow secondary adjustment tank, the overflow secondary cyclone and the overflow The three-stage adjustment tanks are connected in series in sequence, the outlet of the overflow three-stage adjustment tank is connected to the dredging cofferdam, the overflow outlets of the overflow and underflow two secondary cyclones are connected to the overflow sedimentation tank, and the outlet of the overflow sedimentation tank is connected to the dredging cofferdam. To the overflow high-pressure filter press equipment, the drug outlets of the flocculant drug dissolving device and the stabilizer drug dissolving device are connected to the drug feeding port of the overflow sedimentation tank.