CN103285661A - Solid-liquid separation device for waste water suspended matters - Google Patents

Abstract

The solid-liquid separation device for suspended solids in wastewater disclosed by the present invention comprises a pool body, the pool body is divided into a water inlet pool and a solid-liquid separation tank by a vertical wall, a water inlet is arranged above the water inlet pool, and the bottom of the water inlet pool communicates with the solid-liquid separation tank, In the solid-liquid separation tank, from top to bottom are the clear water layer, the filter layer for blocking suspended solids, the diffusion layer and the sludge layer. The clean water layer is connected to the water outlet. A suspended solids meter is provided in the filter resistance layer, a sludge collection pipe is provided in the sludge layer, and the sludge collection pipe is connected with a sludge pump. The device has the advantages of simple structure, convenient management, large amount of treated water, good solid-liquid separation effect, and high removal rate of suspended solids in wastewater.

Description

Solid-liquid separation device for suspended solids in wastewater

technical field

The invention belongs to the field of sewage treatment and is suitable for a solid-liquid separation device for breeding wastewater such as greenhouse soft-shelled turtles and pig farms and other wastewater with relatively high suspended matter.

Background technique

With the vigorous development of large-scale and intensive aquaculture in my country, aquaculture wastewater such as greenhouse soft-shelled turtles and pig farms has become an important source of water pollution. In a high-density farming environment, the remaining feed, excrement of farming organisms and dead organisms will be continuously deposited in the bottom mud during the breeding process. In order to ensure the soft-shelled turtle breeding environment in the greenhouse and the healthy growth of the soft-shelled turtle body, the method of frequent water changes is currently used to improve the soft-shelled turtle breeding environment. A large amount of sediment enters the water body with the drainage, resulting in a high content of suspended solids in the discharged wastewater. Studies have shown that the removal of suspended solids can effectively reduce the concentration of N, P and COD in water, and it plays an extremely important role in improving the water quality of aquaculture wastewater. Certain methods must be adopted for solid-liquid separation treatment of wastewater.

At present, for the solid-liquid separation process of such sewage suspended matter, more natural precipitation methods are used. The existing sedimentation tanks mainly include flat flow sedimentation tanks, vertical flow sedimentation tanks, radial flow sedimentation tanks and inclined plate sedimentation tanks. Among them, vertical flow sedimentation tanks are widely used because of their small footprint and better treatment effect. However, the vertical flow sedimentation tank is only suitable for treating wastewater with a small volume of water, and has poor adaptability and buffering capacity to water volume changes. During the sedimentation process, most of the fine suspended solids will float up with the air bubbles and cannot be removed. BOD, ammonia nitrogen, suspended solids ( SS) etc. are still higher.

Filtration is also a common method for solid-liquid separation. Existing filtration methods mainly include grid sieve filtration, microporous filtration, membrane filtration and depth filtration. The existing fillers mainly include quartz sand, anthracite particles, magnetite particles and dolomite particles. Generally, the filter tank needs to be composed of a filter layer, a bedding layer, a water distribution system and a drainage tank. The whole process consists of two stages: filtration and backwashing. separate. There are many factors affecting the whole process, such as filter material properties (size, shape, porosity, thickness and surface properties), suspended matter properties (size, shape, concentration, surface properties), air resistance caused by air bubbles generated in the anaerobic process, and backwashing process control. In short, the filtration treatment method is more complicated, and the process is difficult to control, and the filter material needs to be replaced from time to time, so it cannot be applied to the treatment of greenhouse turtle breeding wastewater with large water volume and uncertain water quality.

EVA material (ethylene-vinyl acetate copolymer) was introduced into my country in 1970. It is a new type of environmentally friendly plastic foam material. Because it is non-toxic, harmless, soft, waterproof and elastic, it is the safest, most convenient and high-quality light industry in modern times. raw materials. EVA has the advantages of good cushioning, shock resistance, heat insulation, moisture resistance, and chemical corrosion resistance, and it will not cause a large degree of deformation under high temperature, blisters, and kneading. In addition, the density of EVA material is between 0.91 and 0.93, which can be suspended in water. It does not contain heavy metals and is biodegradable, and will not cause secondary pollution to the environment, and has a wide range of applications.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned solid-liquid separation method (sedimentation and filtration), the present invention provides a simple structure, small footprint, convenient management, high treatment effect, and can treat breeding wastewater such as greenhouse soft-shelled turtles, pig farms and other wastewater High-efficiency solid-liquid separation device for wastewater with high suspended solids.

The purpose of the present invention is achieved by the following technical solutions: the solid-liquid separation device for suspended solids in wastewater, comprising a pool body, which is divided into a water inlet pool and a solid-liquid separation tank by a vertical wall, a water inlet is arranged above the water inlet pool, and the water inlet pool The lower part is connected to the solid-liquid separation tank. From top to bottom, the solid-liquid separation tank is divided into a clear water layer, a filter layer for blocking suspended solids, a diffusion layer and a sludge layer. The clean water layer is connected to the water outlet, and the clear water layer and filter layer A partition with mesh is arranged between them, a suspended solids measuring meter is arranged in the filter resistance layer, and a sludge collecting pipe is arranged in the sludge layer, and the sludge collecting pipe is connected with a sludge pump.

The above-mentioned filter resistance layer is a suspension layer that is processed into a "cross" shape by hydrophobic and inert EVA material, and is tightly combined between individuals in water.

The solid-liquid separation device for treating suspended solids in wastewater is suitable for the solid-liquid separation process of aquaculture wastewater such as greenhouse soft-shell turtles and pig farms and other wastewater with relatively high suspended solids.

The device enters the water tank to receive raw water, and the waste water slowly enters the solid-liquid separation tank.

The use process is divided into two processes: influent filtration and water stop collecting sludge. When the water enters, the wastewater enters from the inlet pool, and when it flows through the diffusion layer, the larger particle pollutants in the wastewater, such as the remaining feed, excrement of breeding organisms and dead organisms, sink to the sludge layer through sedimentation. Smaller particles have poor sedimentation effect and will float up to the filter layer with the water flow or air bubbles. In the filter layer, through the impact with the "cross" shaped EVA material, most of the air bubbles attached to the particles will burst, and the smaller particles will be filtered by the filter layer. Blocking, because the water flow in the filter layer is almost static, the particles larger than the water density sink to the sludge layer under the action of gravity, while the clean water enters the clear water layer through the filter layer and the mesh partition and overflows through the upper outlet . During the water intake process, due to the water pressure and the extrusion of the partition, the "ten" shaped EVA material will continue to rise with the increase of the water intake, and finally the individuals will be closely combined to form a filter layer with extremely small porosity. When the suspended solids (SS) meter monitors that the wastewater SS≧50 in the upper part of the filter resistance layer, the sensor controls the water inflow to stop. After the water inflow stops, the "ten" shaped EVA material and sludge will settle rapidly due to the lower water pressure of the lower layer, and the sludge will be collected by the lower layer collecting pipe, pumped out and discharged by the mud pump. Finally, the solid-liquid separation is completely realized.

The present invention has the following advantages:

(1) The hydrophobic and inert EVA material used is a new type of environmentally friendly plastic foam material, which is processed into a "ten" shape, which is not easy to deform and can be suspended in water.

(2) Due to its special "cross" shape, the EVA material can be closely combined with each other under the pressure of water inlet and the extrusion of the partition, with a small porosity and a strong filtering effect.

(3) A water inlet pool is added before the solid-liquid separation tank, which can buffer the impact of water inlet on the solid-liquid separation process and reduce power consumption.

(4) The suspended solids meter is used to monitor the concentration of suspended solids in the upper part of the filter layer, and the sensor is used to control the water inlet switch through the change of suspended solids concentration, which is convenient for management.

(5) The treatment process is simple, the performance is stable, and the effluent water quality is good. The structure is simple, and when the water level drops when the sludge is sucked, it has a good flushing effect on the filter layer material, and its filtering function can be completely restored, without problems such as clogging.

Description of drawings

The figure is a schematic diagram of the structure of the present invention.

In the figure: 1 water inlet, 2 water inlet tank, 3 tank body, 4 sedimentation layer, 5 diffusion layer, 6 filter resistance layer, 7 clear water layer, 8 water outlet, 9 sludge collection pipe, 10 mud pump, 11 partition , 12 suspended solids meter.

Detailed ways

Referring to Fig. 1, the solid-liquid separation device of the wastewater suspended matter of the present invention comprises a tank body 3, which is divided into a water inlet pool 2 and a solid-liquid separation tank by a vertical wall in the pool body 3, and a water inlet 1 is arranged above the water inlet pool 2, and a water inlet pool 2. The lower part is connected to the solid-liquid separation tank. From top to bottom, the solid-liquid separation tank is divided into a clear water layer 7, a filter layer 6 for blocking suspended solids, a diffusion layer 5 and a sludge layer 4. The clear water layer 7 is connected to the water outlet 8 , between the clear water layer 7 and the filter resistance layer 6, a partition plate 11 with a mesh is arranged, a suspended solids meter 12 is arranged in the filter resistance layer 6, and a sludge collection pipe 9 is provided on the sludge layer 4, and the sludge collection pipe 9 links to each other with dredge pump 10.

The filter resistance layer 6 is a suspension layer that is processed into a "cross" shape by hydrophobic and inert EVA material, and is closely combined with individuals in water. It has a strong filtering effect on suspended solids.

The use process is divided into two processes: influent filtration and water stop collecting sludge. When the water enters, the waste water enters from the water inlet pool 2, and when it flows through the diffusion layer 5, the larger particle pollutants in the waste water such as the remaining feed, excrement of breeding organisms and dead organisms sink to the sludge layer 4 through sedimentation . Smaller particles have poor sedimentation effect and will float up to the filter layer 6 with the water flow or air bubbles. In the filter layer 6, through the impact with the EVA material, most of the air bubbles attached to the particles are broken, and the smaller particles are blocked by the filter layer. The water flow in the filter resistance layer 6 is almost static, and the particles with a density greater than water sink to the sludge layer 4 under the action of gravity, while the clean water enters the clean water layer 7 through the filter resistance layer 6 and the mesh partition 11 and passes through the upper outlet. Spout overflows. During the water intake process, due to the water intake pressure and the extrusion of the partition, the EVA material will continue to rise with the increase of the intake water, and finally the individuals will be closely combined to form a filter layer with extremely small porosity. When the suspended solids meter 12 monitors that the wastewater SS≧50 in the upper part of the filter resistance layer, the water inflow is controlled by the sensor to stop. After the water inflow stops, the EVA material and the sludge will settle rapidly due to the lower water pressure, and the sludge will be collected by the lower collecting pipe 9, pumped out by the mud pump 10 and discharged. Finally, the solid-liquid separation is completely realized.

Claims (2)

1. The solid-liquid separation device for suspended solids in wastewater, which is characterized in that it includes a pool body (3), and the pool body (3) is divided into a water inlet pool (2) and a solid-liquid separation tank by a vertical wall, and the top of the water inlet pool (2) is set The water inlet (1), the bottom of the water inlet pool (2) is connected with the solid-liquid separation tank, and the solid-liquid separation tank is divided into a clear water layer (7), a filter layer (6) for blocking suspended solids, and a diffusion layer ( 5) and the sludge layer (4), the clean water layer (7) is connected to the water outlet (8), and a partition plate (11) with mesh is set between the clean water layer (7) and the filter resistance layer (6). A suspended solids meter (12) is provided in the resistance layer (6), and a sludge collection pipe (9) is provided in the sludge layer (4), and the sludge collection pipe (9) is connected to the sludge pump (10). 2. The solid-liquid separation device for suspended matter in wastewater according to claim 1, characterized in that the filter resistance layer (6) is a suspension layer that is processed into a "cross" shape by hydrophobic and inert EVA, and is tightly combined between individuals in the water.

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