CN101560000A - Anti-destabilization flocculent precipitate reversed separating jar - Google Patents

Abstract

The invention provides an anti-disturbance floc precipitation reverse separation tank, which includes a floc energy dissipation diversion area, a spiral separation plate, a floc storage bin and a reverse filter bin, and the floc energy dissipation diversion area includes a water inlet pipe The connected diversion pipe and the cap-shaped diversion cover arranged on its upper part; the spiral separation plate and the tank shell form a descending spiral channel; the floc storage bin is set at the lower part of the tank and connected with the floc drainage pipe; reverse filtration The warehouse is arranged on the upper part of the tank body, a water outlet is arranged on the top, and a filter screen is arranged at the water outlet, and the top of the tank body is communicated with the water outlet pipeline. It is a closed coagulation solid-liquid separation device with small footprint, low investment and operating costs, low pollution, low energy consumption, simple configuration, high solid-liquid separation efficiency, small filter load, and convenient floc collection. Appropriate combination of coagulation agent and coagulation system is suitable for efficient solid-liquid separation and purification of flocculation coagulation sewage treatment methods such as potato/corn starch processing wastewater, chemical wastewater and steelmaking dust removal wastewater.

Description

Anti-disturbance floc sedimentation reverse separation tank

technical field

The invention relates to the technical field of flocculation separation, in particular to an anti-disturbance floc precipitation reverse separation tank.

Background technique

At present, the treatment of high-concentration wastewater such as potato, cassava and corn starch and other agricultural product processing wastewater and chemical and chemical wastewater is relatively difficult and is a worldwide problem. The use of conventional biochemical treatment requires large investment, high operating costs, and poor treatment effects. In the prior art, high-concentration sewage is usually treated by flocculation. Flocculation treatment can be divided into two types: static and dynamic. The traditional static flocculation treatment usually needs to build a large-scale sedimentation tank to match it. Its advantage is low energy consumption, and its disadvantages are: ① The mixing of flocculant and sewage Insufficient strength; ②Sedimentation tank has high infrastructure cost and covers a large area; ③Secondary pollution is easy to occur, especially starch and agricultural product processing wastewater are rich in organic nutrients, and it is easy to breed bacteria if they stay in the sedimentation tank for a long time. Produce a large amount of harmful gas, pollute the surrounding environment. The same problem also occurs in the flocculation, precipitation, separation and extraction of natural medicines, organic materials, etc., and in the traditional tap water purification process. The dynamic flocculation method has the advantages of fast flocculation speed and the shearing effect on the flocs to make the flocs dense. However, the existing technology usually adopts open, co-directional or side-to-side sedimentation filtration treatment. This kind of treatment method, the flocs are easy to concentrate On the filter screen, the filtration load is too heavy, and there are disadvantages such as high energy consumption, inconvenient recovery of flocs, slow settling speed caused by water flow disturbance, easy blockage of device pipelines by flocs, and the quality of effluent water is easily affected by environmental changes. For example, the variable direction and variable speed pulsating water flow type flocculation device and flocculation process with application number 200410059901.4, the semi-circulation jet type flocculation device and flocculation process with application number 200410059903.3, and the equipment and technology for extracting protein from potato starch wastewater with application number 200510053212.7, all An external power system or heating device is required, and the energy consumption is high; the twisted flocculation device with application number 92214473.7 and the bucket grid flocculation device with application number 200720035134.2 use open-air sedimentation tanks, and the water quality is easily affected by environmental changes and will cause pollution; The application number is 98237001.6. The water distribution and flocculation device in the transition section of the reaction tank adopts vertical grid arrangement to reduce the kinetic energy of the flowing water, and cannot recover the flocs enriched at the bottom of the tank, which affects the further adsorption and separation of the pollutants in the sewage by the flocs.

Contents of the invention

The purpose of the present invention is to provide an anti-disturbance floc sedimentation reverse separation tank, which can realize the reverse separation function of floc sedimentation and filtration in the same device, the floc enrichment and sedimentation process is anti-disturbance, and the solid-liquid separation efficiency is high , The filter load is small, and the energy consumption is low.

For realizing above-mentioned object, the technical scheme that the present invention takes is:

An anti-disturbance floc sedimentation reverse separation tank, including a floc energy dissipation diversion area, a spiral separation plate, a floc storage bin and a reverse filter bin, the floc energy dissipation diversion area includes a The guide tube and the cap-shaped guide cover arranged on its top, the guide cover opening is downward, and there is a gap between the guide tube and its nozzle and the guide cover; the spiral separation plate is a The downward spiral spiral plate in the vertical part, the spiral separation plate and the tank shell form a descending spiral channel; the floc storage bin is located at the lower part of the tank body, and its bottom is connected with the flocculation pipeline; the reverse filter bin It is arranged on the upper part of the tank body, the top of which is provided with a water outlet, and a filter screen is arranged at the water outlet, and the top of the tank body is connected with the water outlet pipeline.

The vertical part of the diversion pipe is arranged at the middle and lower part of the tank body, and its longitudinal axis coincides with the longitudinal axis of the tank body. into the windshield.

The ratio of the minimum diameter to the maximum diameter of the vertical part of the draft tube is 1:2-6, and its length is 1/5-1/15 of the tank height.

The spiral separation plate is a continuous downward spiral spiral plate.

The spiral separation plate is arranged in a downward spiral shape by stacking a plurality of sheet plates.

The tank body is provided with an observation mirror.

The filter set at the water outlet of the reverse filter chamber is fixed under a porous bottom plate.

A rotatable scraper is also arranged under the filter screen, a transmission shaft is arranged vertically on the scraper, and the upper end of the transmission shaft is connected with the rotary knob arranged outside the reverse filter chamber.

The upper part of the reverse filter chamber is also connected with a backwashing device.

The anti-disturbance floc sedimentation reverse separation tank provided by the invention is a set of small occupied area, low investment, low operating cost, low pollution, low energy consumption, simple configuration, continuous work, high solid-liquid separation efficiency, and filter screen Closed coagulation-solid-liquid separation device with small load, convenient floc collection and simple operation. The device cooperates with an appropriate combined coagulation agent and coagulation system, and is suitable for efficient solid-liquid separation and purification of flocculation and coagulation wastewater treatment methods such as potato starch processing wastewater, corn starch wastewater, chemical wastewater, and steelmaking dust removal wastewater. For urban sewage treatment, small-scale sewage treatment can be carried out in the center of the urban area or at a relatively concentrated sewage outlet due to its small footprint and no peculiar smell, which greatly reduces the need for a large number of pipelines to mix and concentrate various sewage in the current biochemical sewage treatment. Huge investment in a large number of pipe networks required to transport to sewage treatment plants for unified treatment.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the figure: 1- water inlet pipe, 2- water inlet valve, 3- diversion pipe, 4- diversion cover, 5- spiral separation plate, 6- floc storage bin, 7- water outlet, 8- observation mirror, 9 -scraper, 10-filter, 11-porous bottom plate, 12-rotary knob, 13-pressure gauge 1, 14-transmission shaft, 15-water outlet valve, 16-drainage pipe valve, 17-drainage pipe, 18-reverse Flushing valve, 19-clear water pump, 20-clear water tank, 21-flocculation pipeline valve, 22-flocculation pipeline, 23-pressure gauge two.

Detailed ways

An anti-disturbance floc sedimentation reverse separation tank as shown in Figure 1, its shape is a cylindrical vertical tank, including floc energy dissipation and diversion area, spiral separation plate 5, floc storage bin 6 and reverse filter bin .

The floc energy dissipation diversion area includes a diversion pipe 3 connected to the water inlet pipe and a hat-shaped diversion cover 4 arranged on its upper part, and the vertical part of the diversion pipe 3 is arranged at the middle and lower part of the tank body, and its The longitudinal axis coincides with the longitudinal axis of the tank body. The vertical part of the diversion pipe 3 is in the shape of a gradually widening trumpet. Its small mouth end is connected with the water inlet pipe 1, and the large mouth end extends into the shroud 4. The water inlet pipe 1 is provided with a water inlet valve. 2. The ratio of the minimum diameter to the maximum diameter of the vertical part of the draft tube 3 is 1:2 to 6, and its length is 1/5 to 1/15 of the height of the tank body. The opening is downward, there is a gap between the nozzle of the nozzle 3 and the nozzle of the nozzle 4, and the distance between the nozzle of the nozzle of the nozzle 3 and the nozzle 4 is 1/ of the diameter of the water outlet of the nozzle 3 Choose between 2 to 1, the diameter of the diversion cover 4 is 2 to 5 times the diameter of the water outlet of the diversion pipe 3, and the height of the diversion cover 4 is 2 to 5 times the diameter of the water outlet of the diversion pipe 3. The solid-liquid mixture enters the diversion cap-shaped cover 4 from the water inlet pipe 1 through the gradually widening trumpet-shaped diversion pipe 3, and the floc energy dissipation diversion area can quickly reduce the fluid flow rate, reduce kinetic energy, and reduce the Brownian of flocs. Movement helps flocs grow and settle.

The spiral separation plate 5 is a downward spiral spiral plate with the vertical part of the draft tube 3 as the axis, and forms a descending spiral channel with the tank shell. The spiral separation plate 5 can be a continuous downward spiral spiral The plate can also be arranged in a spiral shape by stacking multiple sheet-like plates. The inclination angle of the spiral separation plate 5 is 10-60°, and the rotation period is 1-4 weeks. The heavier and denser flocs rely on gravity to move along the The spiral separation plate 5 rolls down into the floc storage bin 6 .

The floc storage bin 6 is arranged at the lower part of the tank body, and its bottom is funnel-shaped, connected to the floc discharge pipeline 22, which is provided with a floc discharge pipeline valve 21, and the floc storage bin 6 is used for temporarily storing flocs. Where there is a body, it can prevent the flow of the upper liquid from disturbing the settlement of the lower flocs. There is also an observation mirror 8 on the tank wall to observe the settlement and accumulation of the flocs. According to the volume of the flocs, the valve 21 of the flocculation pipeline is intermittently opened to release the flocs through the flocculation pipeline 22.

The reverse filter chamber is arranged on the top of the tank body, and the top is provided with a water outlet 7, and the water outlet 7 is provided with a filter screen 10 of more than 300 meshes, and the filter screen 10 is fixed under a porous bottom plate 11, and the porous bottom plate 11 The number and size of the upper holes can be set according to its material, thickness, maximum liquid flow and the condition that the supporting filter screen is not broken. The filter screen 10 and the perforated bottom plate 11 are fixed in the middle by a flange, and the flange is fixed by a plurality of bolts and fast fasteners. The material of filter screen 10 is metal, pottery, cotton fiber, chemical fiber etc. When the material of the filter screen 10 has relatively high hardness, such as metal or ceramics, the porous bottom plate 11 may not be provided. A rotatable scraper 9 is arranged under the filter screen 10, and a transmission shaft 14 is vertically arranged on the scraper 9. The upper end of the transmission shaft 14 is connected with the rotary knob 12 arranged outside the reverse filter chamber, and the rotation of the scraper 9 is driven by rotating the rotary knob 12. . The scraper 9 is close to the filter screen 10 above, and the scraper 9 is made of a certain strength and elastic hard plastic or a composite material or an inlay material of plastic and metal. Smaller flocs float upwards, and the filter screen 10 blocks the fine flocs under the net, and the flocs gradually accumulate to form a downwardly suspended reverse self-filtering layer with a certain thickness and density. The self-filtering part of the floc will continue to increase the volume of the floc through physical adsorption and chemical reaction. With the further accumulation of flocs, the floc sludge that absorbs more pollutants will be separated from the filter screen 10 naturally due to the weight or rotated by the scraper 9, and will be settled by gravity and guided along the spiral separation plate 5. Lead sedimentation to the floc storage bin 24, and the accumulation situation of the floc can be observed from the observation mirror 8. At the same time, the newly entered fine flocs continue to rise, supplementing the downwardly suspended reverse self-filtering layer, so that its thickness and density always reach a dynamic balance. The maintenance of this dynamic balance is regulated by the pressure difference between the upper and lower filter screens The pressure difference adjustment range is between 0.01-0.5 MPa, and the pressure difference between the upper and lower sides of the filter screen 10 can be calculated through the data displayed by the pressure gauge 13 and the pressure gauge 2 23 . The separated and filtered clean water enters the inner cavity of the top cover, and then is discharged through the pipeline and the outlet valve 15, the drain pipe valve 16 and the drain pipe 17, and is directly discharged into the river or reused for farmland irrigation and landscaping. The backwash valve 18 connected to the top cover of the filter chamber is closed.

The anti-disturbance floc sedimentation reverse separation tank also includes a backwashing device, which is connected to the upper part of the reverse filter chamber. The backwashing device is composed of a clean water tank 20, a clean water pump 19, a backwash valve 18, a water outlet valve 15, a liquid discharge pipe valve 16, a water inlet valve 2, a flocculation discharge pipe valve 21 and connecting pipes. If you want to backwash the anti-disturbance floc sedimentation reverse separation tank, you can turn on the clean water pump 19, the backwash valve 18 and the flocculation pipeline valve 21, close the water inlet valve 2 and the water outlet valve 15, and carry out backwashing for 5 to 10 minutes That's it.

What has been described above are only specific embodiments of the present invention. It should be pointed out that for those skilled in the art, under the technical enlightenment provided by the present invention, other equivalent modifications and improvements should be regarded as the protection scope of the present invention.

Claims (9)

1. An anti-disturbance floc reverse sedimentation separation tank, characterized in that it includes a floc energy dissipation and diversion area, a spiral separation plate, a floc storage bin and a reverse filter bin, and the floc energy dissipation and diversion The area includes a diversion pipe connected to the water inlet pipe and a cap-shaped diversion cover arranged on its upper part, the diversion cover opening is downward, and there is a gap between the diversion pipe and its nozzle and the diversion cover; the spiral separation The plate is a downward spiral spiral plate surrounding the vertical part of the draft tube. The spiral separation plate and the tank shell form a descending spiral channel; the floc storage bin is located at the bottom of the tank, and its bottom is connected to the floc discharge pipe The reverse filter chamber is set on the upper part of the tank body, the top of which is provided with a water outlet, and a filter screen is set at the water outlet, and the top of the tank body is connected with the water outlet pipeline. 2. The anti-disturbance floc reverse sedimentation separation tank according to claim 1, characterized in that: the vertical part of the diversion pipe is arranged in the middle and lower part of the tank body, and its longitudinal axis coincides with the longitudinal axis of the tank body, The vertical part of the diversion pipe is gradually widened and trumpet-shaped, and its small mouth end is connected with the water inlet pipe, and its large mouth end extends into the diversion cover. 3. The anti-disturbance floc reverse sedimentation separation tank according to claim 2, characterized in that: the ratio of the minimum diameter to the maximum diameter of the vertical part of the diversion pipe is 1:2-6, and the length of the diversion pipe It is 1/5~1/15 of the tank height. 4. The anti-disturbance floc reverse sedimentation separation tank according to claim 1, characterized in that: the spiral separation plate is a continuous downward spiral spiral plate. 5. The anti-disturbance floc reverse sedimentation separation tank according to claim 1, characterized in that: the spiral separation plate is arranged in a downward spiral spiral by a plurality of sheet-like plates. 6. The anti-disturbance floc reverse sedimentation separation tank according to claim 1, characterized in that: the tank body is also provided with an observation mirror. 7. The anti-disturbance floc reverse sedimentation separation tank according to claim 1, characterized in that: the filter set at the water outlet of the reverse filter chamber is fixed under a porous bottom plate. 8. The anti-disturbance floc reverse sedimentation separation tank according to claim 1 or 7, characterized in that: a rotatable scraper is provided under the filter screen, a transmission shaft is vertically arranged on the scraper, and the upper end of the transmission shaft is connected to the The rotary knob arranged outside the reverse filter chamber is connected. 9. The anti-disturbance floc reverse sedimentation and separation tank according to claim 1, characterized in that: the upper part of the reverse filter chamber is also connected with a backwashing device.

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