Cooling apparatus of regulating tank

A regulating tank includes a tank member having an annular wall to receive wastewater. A circular pipe is connected to the tank member. A draining device drains the wastewater in the tank member to the circular pipe. A plurality of nozzles connected to the circular pipe to eject the wastewater in the circular pipe back to the tank member. When the wastewater is ejected by the nozzles, a temperature of the wastewater is reduced, and dissolved oxygen of the wastewater is increased.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates to a wastewater treatment system, and more particularly to a cooling apparatus of a regulating tank.

2. Description of Related Art

Recycling of papers is getting more and more important in present days since shortage of natural resource is more and more serious. In order to separate fibers in waste paper and remove ink from fibers, it needs specified chemical solutions and water in aforesaid processes. As a result, it generates large amount of wastewater in the process of paper recycling.

Treatments of wastewater in paper recycling including coagulation process, biochemical process, and chemical process. Bacteria, such as anaerobic bacteria and aerobic bacteria, are used in biochemical process. Environment is deeply effects the works of bacteria, such as temperature and pH value of water. Typically, high temperature is bad for bacteria, and water temperature always increases in wastewater treatment. A conventional solution is adding chemical solution to help the works of bacteria instead of lowering the temperature. It only has limited effect.

BRIEF SUMMARY OF THE INVENTION

In view of the above, the primary objective of the present invention is to provide a regulating tank, which may lower water temperature and increase dissolved oxygen to help the works of aerobic bacteria in biochemical process.

In order to achieve the objective of the present invention, a regulating tank includes a tank member having an annular wall to receive wastewater; a circular pipe connected to the tank member; a draining device for draining the wastewater in the tank member to the circular pipe; and a plurality of nozzles connected to the circular pipe to eject the wastewater in the circular pipe back to the tank member.

In an embodiment, the draining device includes a water pump and a guiding pipe; the water pump pumps the wastewater in the tank member, and the guiding pipe has opposite ends connected to the water pump and the circular pipe.

In an embodiment, each of the nozzles is provided with a controller to open and close the nozzle by control.

In an embodiment, the regulating tank further includes a first overflow weir on an interior side of the annular wall of the tank member.

In an embodiment, the regulating tank further includes a first pump and a first return pipe; the first pump pumps the wastewater in the tank member, and the first return pipe has an end connected to the first pump and an opposite end associated with the first overflow weir.

In an embodiment, the second overflow weir is provided with a plurality of stop plates; the stop plates are separated from each other to form a flowing gap between each two of the neighboring stop plates.

In an embodiment, the regulating tank further includes a second overflow weir having a plurality of terminals associated with the first overflow weir to communicate the second overflow weir with the first overflow weir.

In an embodiment, the regulating tank further includes a second return pipe having an end connected to the circular pipe and an opposite end associated with the second overflow weir.

In an embodiment, the second overflow weir is provided with a plurality of stop plates; the stop plates are separated from each other to form a flowing gap between each two of the neighboring stop plates.

In an embodiment, the regulating tank further includes a frame connected to the tank member, wherein the second overflow weir is connected to the frame to be positioned over the tank member.

DETAILED DESCRIPTION OF THE INVENTION

A wastewater treatment system of the preferred embodiment of the present invention includes a primary settling tank and a regulating tank connected to the primary settling tank through pipes. In the present embodiment, the primary settling tank is higher than regulating tank, so that wastewater flows to regulating tank from the primary settling tank by gravity.

As shown inFIG. 1, the regulating tank includes a tank member10. The tank member10has an annular wall12and a bottom to enclose a chamber14therein to receive the wastewater from the primary settling tank.

A circular pipe20is fixed to a top edge of the annular wall12of the tank member10. A draining device30having a first pump32and a first guiding pipe34. The first guiding pipe34has opposite ends connected to the first pump32and the circular pipe20. The first pump32pumps the wastewater in the tank member10to the circular pipe20through the first guiding pipe34.

A plurality of nozzles40are connected to the circular pipe20with specified angles to eject the wastewater in the circular pipe20into the tank member10.

The first pump32pumps the wastewater in the tank member10to the circular pipe20through the first guiding pipe34, and then the nozzles40eject the wastewater into the tank member10to create a water circulation and disturb the wastewater in the tank member10. When the wastewater is ejected by the nozzles40, a temperature of the wastewater is reduced, and a dissolved oxygen of the wastewater is increased.

As shown inFIG. 2, each of the nozzles40is provided with a controller42, and the controllers42controls the nozzles40to open and closed to control the time and quantity of the wastewater ejected by the nozzles42.

As shown inFIG. 3, the regulating tank further includes a first overflow weir50on an interior side of the annular wall12. The wastewater from the primary settling tank flows to the first overflow weir50, and then flows to the chamber14of the tank member10. The regulating tank further includes a water pump52and a first return pipe54. The water pump52pumps the wastewater in the chamber14to the first overflow weir16through the first return pipe24.

The first overflow weir50is provided with a plurality of stop plates56. The stop plates56are separated from each other to form a flowing gap58between each two of the neighboring stop plates56. The wastewater flows back to the tank member10through the flowing gaps58of the first overflow weir50.

As shown inFIG. 4, the regulating tank further includes a second overflow weir60, which has a plurality of terminals62communicated with the first overflow weir50. As a result, the wastewater may flow from the first overflow weir50to the second overflow weir60. As shown inFIG. 5, a second return pipe62has an end connected to the circular pipe20and an opposite end associated with the second overflow weir60. As a result, the water pump32pumps the wastewater to the circular pipe20, and the wastewater in the circular pipe20may flows back to the tank member10through the second return pipe62and the second overflow weir60in sequence.

As shown inFIGS. 4 and 5, the wastewater flows to second overflow weir60via the draining device30and the second return pipe62, and then the wastewater flows back the tank member10from the second overflow weir60. It may reduce the temperature of the wastewater and increase the dissolved oxygen of the wastewater.

As shown inFIG. 6, the second overflow weir60is provided with a plurality of stop plates64. The stop plates64are separated from each other to form a flowing gap66between each two of the neighboring stop plates64. The wastewater flows back to the tank member10through the flowing gaps66of the second overflow weir60. The regulating tank further includes a frame70has ends connected to the tank member10. The frame70is above the second overflow weir60and connected to the second overflow weir60. The frame70has a cross shape as the second overflow weir60, and four ends of the frame70are fixed to the tank member10to make the frame70cross over the tank member10. The second overflow weir60is hung under the frame70to position the second overflow weir60over the tank member10.

The second return pipe62is provided with a control valve53to open or close the second return pipe62. It may control the time and quantity of the wastewater flows out of the second return pipe62.

In conclusion, the wastewater in the tank member10disturbed by the nozzles52, and the first and the second overflow weir50,60. When the wastewater is exposed in the air, it may reduce the temperature of the wastewater and increase the dissolved oxygen of the wastewater. It is helpful to the works of aerobic bacteria.