KR100680021B1 - Recycling apparatus for industrial waste water - Google Patents

Abstract

 An industrial wastewater recycling apparatus is provided for feeding wastewater to at least one parallel connected filter cylinder by a pump. It differs from the prior art in that the filtration treatment can be carried out without the use of silica, neutralization grooves, ceramics, filter elements and centrifugal forces. On the other hand, the supply of waste water by the pump depends on the pressure of the filter cylinder for optimum filtration efficiency. On the other hand, the risk of rupture of the filter bag can be avoided. In addition, the supply of waste water by the pump depends on the pressure of the filter cylinder to allow for optimal filtration efficiency and to prevent rupture of the filter bag. In addition, the metal powder in the waste water can be efficiently separated by a multilayer filter bag in the filter cylinder. In addition, the water in the metal powder is removed using auxiliary compressed air, whereby the expensive metal powder can be optimally recovered. Finally, impurity free filtrate can be sent back to the manufacturing process for further reuse.

Description

Industrial wastewater recycling unit {RECYCLING APPARATUS FOR INDUSTRIAL WASTE WATER}

1 is a view schematically showing the structure of the present invention,

2 is a view schematically showing a filter loop of the present invention,

3 is a cross sectional view of a filtration unit according to the invention showing that wastewater is being injected in,

4 is a perspective view of the filter bag in partial cross-section,

5 is an enlarged view of a filter bag of a laminated structure according to the present invention,

6 is a cross-sectional view of the filtration unit according to the invention showing stopping the injection of waste water and starting the injection of air,

7 is a view schematically showing the replacement of the filter bag.

<Explanation of symbols for the main parts of the drawings>

10: wastewater collection container

11: conduit

12: wastewater

13: overflow contact

20: pump

21: suction pipe

22: discharge pipe

23: check valve

24: pressure alarm

25: control valve

30: filter cylinder

31: cylinder body

32: cylinder cover

33: U-shaped mesh groove

34: locking element

35: pressure gauge

40: Filtrate Collection Vessel

50: air compressor

51: air injection pipe

52: control valve

70: filter bag

71: back

72: frame for position setting

80: flexible filter element

121: metal powder

The present invention relates to an industrial wastewater recycling apparatus, and more particularly, to an apparatus configured to recover copper powder contained in wastewater. On the other hand, the filtrate can be fed back to the manufacturing process for further reuse.

Industrial wastewater is of great interest as it relates to the interests of manufacturers and environmental protection bodies. Such wastewater contains toxic substances, so improper treatment of such wastewater will cause serious environmental pollution and endanger human life. In addition, industrial wastewater contains recyclable materials such as copper, gold, nickel and the like. Thus, the disposal of such waste water at will will cause unnecessary losses.

Etching, grinding and other processes are required for the manufacture of printed circuit boards (PCBs), and the wastewater contains copper. Since these metal materials are expensive, all manufacturers are trying to recover them for reuse.

The most common recovery method is to inject wastewater through a web filter element where a layer of silica is attached to reduce the dimensions of the mesh. The metal powder contained in the waste water can be separated by the filter element and accumulate on the filter element, but such metal powder is mixed with silica. Thus, in order to separate them from each other, an additional treatment procedure using, for example, chemicals is required. In this way, the silica will contain heavy metal chemicals, thereby contaminating the environment. In addition, after using the web filter element for a predetermined time, the machine must be shut down for about 30 minutes to refill the silica. Thus, wastewater during the treatment can flow out to rivers or farmland without being treated, which will cause serious environmental disputes and disputes arising between manufacturers and local farmers or residents.

The main object of the present invention is to solve the above problems, and to provide an industrial wastewater recycling apparatus in which industrial wastewater is fed to a filter cylinder connected in parallel by a pump. The supply of waste water by the pump depends on the pressure of the filter cylinder for optimum filtration efficiency. On the other hand, the risk of rupture of the filter bag can be avoided. In addition, safety can be further ensured by using an overflow contact in the pressure alarm of the pump and in the wastewater collection vessel.

Another object of the present invention is to provide an industrial wastewater recycling apparatus for injecting industrial wastewater upwardly from a cylinder cover into a filter bag. In this way, the metal powder is separated by a multilayer filter bag and accumulates therein. Thus, the filtered water passing through the filter bag contains no impurities and can be sent back to the manufacturing process for further reuse. Thus, no waste water is sent to the external environment, thereby preventing the external environment from being contaminated. In addition, this recycling process can reuse resources.

It is still another object of the present invention to provide an industrial wastewater recycling apparatus in which the filter bag is manufactured by a crevice-free connection. In this way, the filter bag can rupture, preventing wastewater from leaking through the filter bag during the filtration process. This allows the recovered filtrate to be returned to the manufacturing process for further use.

The above and other objects and objects of the present invention will be apparent from the following detailed description and the accompanying drawings.

First, referring to FIG. 1 and FIG. 2, an embodiment of an industrial wastewater recycling apparatus is provided with a wastewater collection vessel 10 and a pump 20.

The wastewater collection vessel 10 is adapted to receive wastewater generated in the manufacturing process and discharged through the conduit 11. The process is particularly concerned with etching or grinding processes for printed circuit boards. Wastewater produced in the process contains powders of copper or other metals.

The pump 20 has a suction pipe 21 extending laterally from the suction port of the pump 20 and connected to the wastewater collection vessel 10. The pump 20 also has a discharge pipe 22 extending upwardly from the discharge port of the pump 20 and connected to the plurality of filter cylinders 30. In this way, wastewater 12 can be sent into filter cylinder 30 to remove metal powder from wastewater 12 and convert the wastewater 12 into clean filtered water 42. Thereafter, the filtrate 42 may be fed to the filtrate collecting vessel 40 through the corresponding collecting pipe 41.

The suction pipe 21 of the pump 20 is provided with a check valve 23 to prevent waste water from flowing back in the suction pipe 21. On the other hand, optionally, a pressure alarm 24 is disposed in the discharge port of the pump 20 to stop the operation of the pump 20 when the discharge pressure of the pump 20 exceeds a preset value. Thus, the safety in the filtration process can be further ensured. In addition, the discharge pipe 22 is provided with a control valve 25 in the filter cylinder 30.

As shown in FIG. 3, the filter cylinder 30 includes a cylinder body 31 and a cylinder cover 32. A U-shaped mesh groove 33 having an opening upward is disposed in the cylinder body 31. The U-shaped mesh groove 33 has a support rim 312 formed thereon that supports the filter bag 70 having an opening upwards at an appropriate position. As shown in FIG. 4, the filter bag 70 includes a bag 71 and a positioning frame 72. The bag 71 is made of cloth stacked to form the flexible filter element 80. After forming the bag 71, the connecting surface 711 is created by thermal welding rather than by conventional sewing treatment. In this way, the bag 71 does not have a sewing gap, ensuring a better filtration effect and preventing it from breaking in the sewing area. The bag 71 is thermally welded to the positioning frame 72 at the top thereof. The positioning frame 72 may be made of plastic material. Positioning frame 72 has a frame rim 721 mounted on top of support rim 312 shown in FIG. Thus, the entire filter bag 70 is disposed in the U-shaped mesh groove 33 at appropriate intervals to filter the incoming wastewater 12. The U-shaped mesh groove 33 has the property of steel and is suitable for positioning. As shown in FIG. 4, two handles 722 are formed on the inner rim of the filter bag 70.

Referring again to FIG. 3, the cylinder cover 32 is secured to the top of the cylinder body 31 by at least a locking element 34. The locking element 34 consists of a screw 341 and a corresponding nut 342 which are widely used in pressure vessels. The screw 341 has a screw head pivotably attached to the protruding ear portion 343 on the side of the cylinder body 31. When the ring-shaped nut 342 is released, the cylinder cover 32 becomes pivotable by the screw 341 in the protruding ear portion 343. This belongs to the prior art, and will not be further described herein. One important feature of the present invention is that an extension 321 is formed at the front end of the cylinder cover 32, and the extension 321 forms an arcuate injection passage 322 to which the injection pipe 311 is connected. There is an inner wall. The lower end of the inlet pipe 311 is connected to the outlet pipe 22 of the pump 20. A control valve 25 is arranged between the inlet pipe 311 and the outlet pipe 22.

In addition, the air injection pipe 51 is connected to the injection pipe 311 of the filter cylinder 30. As shown in FIG. 2, the air compressor 50 provides compressed air to flow through the air injection pipe 51. A control valve 52 is mounted to each air injection pipe 51.

1 to 3, when the pump 20 discharges the waste water 12 through the discharge pipe 22 and injects it into the arcuate injection passage 322 through the injection pipe 311, the waste water ( 12 passes upward through arcuate injection passage 322 and is deflected into filter bag 70. In this way, the wastewater 12 is dispersed and falls into the filter bag 70, which is not injected vigorously against the filter bag 70 in the form of a water jet. Thus, the pressure can be evenly distributed. At the same time, the metal powder 121 contained in the waste water 12 will be more uniformly attached to the inner surface of the bag 71. As shown in FIGS. 4 and 5, the bag 71 is made of stacked paper to form the flexible filter element 80. According to a test report made by the Chinese textile industry research institute, the flexible filter element 80 belongs to one type of nonwoven fabric. In order to improve the air permeability of the flexible filter element 80 to the extent that the density of the filter element can block the permeation of the metal powder 121, the flexible filter element 80 is made of polypropylene in each layer. It is produced by a laminate of five layers. As shown in FIG. 5, the first layer 81 has a thickness of 0.22 mm, the second layer 82 has a thickness of 3.1 mm, and the third layer 83 and the fourth layer 84 have a thickness. 0.24 mm, and the fifth layer 85 is 0.37 mm thick. This kind of flexible filter element 80 made of polypropylene can achieve air permeability of 4.6 kW / cm 2 / sec at a pressure of 125 kPa and a surface area of 3.8 cm. The number in air permeability means that the pores of the flexible filter element 80 of the present invention are finer than the conventional filter element to which silica is attached. In other words, the flexible filter element 80 of the present invention exhibits better filtration effects than conventional filter elements with silica. According to a water quality test report conducted at Yuan Ze University's Environmental Science Center in Taiwan, the turbidity of the original wastewater corresponds to 420 NTU and the copper content is 516 mg / l. The wastewater filtered by a conventional filter element with silica has a turbidity of 1.3 NTU and a copper content of 1.17 mg / l, while the wastewater filtered by the flexible filter element 80 according to the invention has a turbidity of 1.1 NTU. And a copper content of 0.60 mg / l. It is superior to water filtered by conventional filter elements with silica in both turbidity and copper content. In addition, the hydrogen ion concentration index (pH) is 7.2, approximating the neutral pH value of 7. According to the above data, it can be concluded that the filtration effect of the present invention is not worse than the filtration effect of the filter element with silica. Most importantly, the present invention does not have a difficult post-treatment process.

In addition, the present invention is characterized in that the filtration process and safety can be controlled not only by the internal pressure of the filter cylinder 30 and the pump 20 but also by the water level of the wastewater collection vessel 10.

As shown in FIG. 6, if the pressure gauge 35 rises to a predetermined pressure value, this means that the metal powder in the filter bag 70 reaches a certain amount and the filter bag 70 needs to be replaced. . Otherwise, the filtration efficiency will be lowered. Therefore, the control valve 25 of the discharge pipe 22 can be shut off, and the cylinder cover 32 can be opened to remove the filter bag 70. Since the metal powder 121 attached to the inside of the filter bag 70 still contains water, an auxiliary air pressure device must be installed. As shown in FIG. 2, the air compressor 50 supplies the compressed air to be flowed into the injection pipe 311 of the filter cylinder 30 to the air injection pipe 51. In addition, a control valve 52 is mounted to the air injection pipe 51. Before opening the cylinder cover 32, an air injection control valve 52 is opened to inject compressed air into the filter bag 70. Therefore, moisture contained in the metal powder 121 may be discharged from the filter bag 70. In this way, the metal powder 121 will optimally accumulate at the bottom of the filter bag 70.

Thereafter, as shown in FIG. 7, the control valve 52 can be closed, and then the cylinder cover 32 can be opened. The filter bag 70 can be removed from the filter cylinder 30 by squeezing the handle 722 with a finger for easy and convenient exchange. On the other hand, the wastewater treatment operation of the other parallel connected filter cylinders 30 will not be affected while exchanging the filter bag 70 of one filter cylinder 30.

Referring again to FIGS. 1 and 2, the internal pressure of the filter cylinder 30 can be detected not only by the pressure gauge 35 but also by the pressure alarm 24. When the pressure reaches a certain level, the operation of the pump 20 automatically stops, thereby avoiding the continuous supply of waste water 12 into the filter cylinder 30. In addition, when the water level of the wastewater collection vessel 10 reaches a predetermined level, the overflow contact 13 sends a signal to the control box 60 to remind the operator to clean the filter cylinder 30. Or generate an optical signal. The control box 60 is provided on one side of the machine table 90, and has several necessary control buttons 61. As shown in FIG. Since the control box 60 is a conventional apparatus, it will not be described further herein.

Based on the techniques described above, the wastewater 12 can be fed to all of the filter cylinders 30 connected in parallel by the pump 20. Wastewater 12 passes through filter bag 70 in an upward injection manner. Meanwhile, the metal powder 121 contained in the wastewater 12 may be efficiently accumulated in the filter bag 70 by the fine pore structure of the filter bag 70. In this way, a precise filtration effect can be achieved. In addition, the water in the filtrate collection vessel 40 meets the requirements for water originally used in the manufacturing process. As a result, the filtrate 42 can be sent back by the other pump 44 via the return pipe 43 to the process for reuse. In this way, water resources can be recycled for environmental protection and efficient use.

The recycling apparatus according to the invention was originally designed for application in the PCB industry. However, it can also be used for conventional wastewater treatment. The entire recycling apparatus can be installed on the machine table 90 and is compact and does not take up much space. In terms of safety and practicality, the recycling apparatus according to the invention has significant economic advantages.

Of course, many modifications and variations can be made in the above-described embodiments of the invention without departing from the scope of the invention. Accordingly, to promote technical development and usefulness, the present invention is disclosed and intended to be limited only by the appended claims.

According to the industrial wastewater recycling apparatus of the present invention, the metal powder in the wastewater can be efficiently separated by a multilayer filter bag in the filter cylinder. In addition, the expensive metal powder can be optimally recovered by removing the moisture in the metal powder using auxiliary compressed air. Finally, impurity free filtrate can be sent back to the manufacturing process for further reuse.

Claims (9)

a) a wastewater collection vessel configured to collect wastewater discharged by the manufacturing process; b) a pump having a suction pipe extending transversely from the suction port and connected to said wastewater collection vessel, and a discharge pipe extending upward from the discharge port; c) at least one filter cylinder having a cylinder body and a cylinder cover, wherein the cylinder body has a U-shaped mesh groove with an opening pointing upwards, the U-shaped mesh groove having an upward position at an appropriate position thereon; A support rim is formed to support the filter bag with an opening opening, the filter bag consisting of a bag and a positioning frame, the bag having multiple layers of deposition laminated by thermal welding to form a flexible filter element. Wherein the bag is thermally welded to the positioning frame at the top thereof, the positioning frame has a frame rim mounted on top of the support rim, and the cylinder cover is mounted to at least one locking element. It is fixed to the upper portion of the cylinder body, the cylinder cover is formed with an extension at its front end, The filter has an inner wall forming an arcuate inlet passage to which the inlet pipe is connected, the lower end of the inlet pipe being connected to the outlet pipe of the pump and a control valve disposed between the inlet pipe and the outlet pipe; d) a filtrate collecting vessel disposed below the collecting pipe at the bottom end of the filter cylinder to collect the filtered water passing through the filter cylinder Industrial wastewater recycling apparatus comprising a. The industrial wastewater recycling apparatus according to claim 1, wherein the suction pipe of the pump is equipped with a check valve. The industrial wastewater recycling apparatus of claim 1, wherein the discharge port of the pump is equipped with a pressure alarm. 2. The industrial wastewater recycling apparatus of claim 1, wherein the filtrate collection vessel comprises a pump for draining filtrate back to the manufacturing process for reuse. The industrial wastewater recycling apparatus according to claim 1, wherein the number of filter cylinders is two or more, and an injection pipe disposed next to each filter cylinder is connected in parallel to the discharge pipe of the pump. The air injection pipe is connected to the injection pipe of the filter cylinder, compressed air is supplied to the air injection pipe by an air compressor, and the air injection pipe is equipped with a control valve. Industrial wastewater recycling unit. The industrial wastewater recycling apparatus according to claim 1, wherein two opposite handles are formed on an inner wall of the frame for positioning the filter bag. 2. The industrial wastewater recycling apparatus of claim 1, wherein the filter bag functions as a filter element made by stacking five layers of polypropylene. The industrial wastewater recycling apparatus of claim 1, wherein an overflow contact is disposed in the wastewater collection container.

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