JP3246195U - Demonstration equipment for organic wastewater treatment - Google Patents

Abstract

[Problem] To provide a demonstration device that can handle actual wastewater containing fluctuating components that cannot be clearly confirmed in laboratory treatment tests by extracting wastewater, in order to confirm the suitability of ozone oxidation treatment, which promotes the decomposition treatment of excess activated sludge, in organic wastewater treatment facilities at existing food processing plants and the like. [Solution] The system is equipped with an adjustment tank 1 and an aeration tank 2 each having a sewage receiving capacity of 50 to 65 liters, a settling tank 3 and a return sludge tank 4 corresponding to the volumes of the adjustment tank and aeration tank, an ozone generator 8 and a blower 7 with a specified output, an aeration tank 2 is provided with an aeration pipe 22 connected to the blower, an ozone releaser 42 is provided in the sludge return tank, an adjustment tank pump 5 is interposed between the adjustment tank and the aeration tank, a return sludge pump 6 is provided between the return sludge tank and the aeration tank, the aeration tank and the settling tank are connected in the middle by a transfer pipe 21, an overflow weir 34 and a discharge pipe 31 connected to the overflow weir are attached to the settling tank, and a sludge transfer pipe 32 is provided at the lower end to connect the various tanks. [Selected drawing] Figure 1

Description

This invention relates to a demonstration device for improving existing equipment that treats organic wastewater.

The activated sludge method, in which the organic matter contained in organic sewage is decomposed by aerobic microorganisms in an aeration tank, is widely used as a means of treating wastewater from sewage and food factories. Due to the discharge of substances, it is currently difficult to deal with the situation using existing wastewater treatment technologies. In addition, sludge (bacterial cells) that cannot be decomposed in the above treatment process remains as surplus sludge. The above-mentioned surplus activated sludge is discharged from the treatment equipment, dehydrated, and then disposed of by disposal such as landfill, incineration, composting, etc. In addition, the volume of the surplus activated sludge is reduced using ozone.

The sludge (excess sludge) produced by biological treatment is produced by bacterial cells and can be decomposed in an aeration tank, but since the cell membranes of the bacterial cells are difficult to decompose, it takes a long time to decompose in the aeration tank. It turns out. Therefore, it has been proposed to bring the cell walls into contact with ozone to decompose and modify the cell walls to make them easily degradable, and then decompose them in an aeration tank (Patent Documents 1 and 2).

Further, the means for reducing the volume of surplus sludge using ozone disclosed in Patent Documents 1 and 2 above draws surplus sludge from a sludge settling tank (discharge tank) to a surplus sludge tank, performs ozone treatment, and then returns it to the aeration treatment line. are doing.

Japanese Patent Application Publication No. 2005-305222. Japanese Patent Application Publication No. 2011-131179.

In existing facilities that use the activated sludge method, it is difficult to treat persistent substances, and surplus activated sludge is disposed of as described above, but as the cost of disposal is increasing, surplus activated sludge It is necessary to reduce the volume of sludge. When constructing an ozone oxidation treatment facility as a facility to improve the treatment capacity for persistent substances and reduce the volume of surplus activated sludge, it is necessary to design equipment that corresponds to the situation of organic sewage in the existing facility.

In general, when designing a facility, the organic wastewater of the facility is pumped out (obtaining sample water), the sample water is ozonated in a laboratory facility, and the suitability and effectiveness of the ozonation treatment is confirmed. However, verification testing by acquiring sample water can only confirm the short-term ozone reaction caused by the sample water, and does not necessarily correspond to the actual situation of wastewater treatment, such as the suitability of ozone treatment in existing treatment facilities and the installation of ozone treatment equipment. I haven't.

Therefore, the present invention proposes a demonstration device for organic sewage treatment to be used in existing facilities.

The demonstration device for organic sewage treatment according to claim 1 of the present invention comprises an adjustment tank and an aeration tank each having a sewage receiving volume of 50 to 65 liters, and a settling tank corresponding to the volume of the adjustment tank and the aeration tank. and a return sludge tank, an ozone generator and a blower with a predetermined output, the aeration tank is equipped with an aeration pipe connected to the blower, the return sludge tank is equipped with an ozone release part, and an adjustment tank is installed between the adjustment tank and the aeration tank. A sludge return pump was installed between the return sludge tank and the aeration tank, and the middle part of the aeration tank and settling tank was connected with an advection pipe, and the settling tank was communicated with the overflow weir and the overflow weir. This system is characterized in that a discharge pipe is attached and a sludge transfer pipe communicating with a return sludge tank is provided at the lower end to connect each tank.

Since it is composed of small, transportable tanks, it can be installed at any desired location, making it ideal for existing treatment facilities for organic sewage, especially for deteriorating treated water quality due to increased loads and reducing the volume of excess sludge. This device is installed near a treatment facility that does not have any existing facilities, and continuously purifies the discharged wastewater to be treated.The treatment status is compared with the treatment status of existing facilities, and ozone treatment improves the quality of treated water and reduces excess sludge. It is possible to confirm the capacity and the optimum ozone supply amount in ozone treatment for the wastewater.

Therefore, as a demonstration test of the ozone effect on organic wastewater to be treated, since wastewater to be treated is not always discharged with a constant content of components, a portion of the wastewater to be treated was pumped out from the facility and transported to the experimental facility. Naturally, when confirming the ozone effect using water, there is an element of uncertainty in the contained components, but when using this equipment, wastewater to be treated that is continuously discharged from the facility is continuously received and ozone treatment is performed. This method performs purification treatment including:

Furthermore, the demonstration device for organic sewage treatment according to claim 2 of the present invention further includes an ozone discharge part and a blower connected to an ozone generator at appropriate positions below each of the adjustment tank, aeration tank, and return sludge tank. It is equipped with connected air diffuser pipes. Therefore, it is possible to confirm not only the effect of ozone treatment on the decomposition treatment of surplus activated sludge, but also the effect of ozone treatment on purification of sewage to be treated and on sludge during sewage treatment.

As mentioned above, the structure of the present invention is that the ozone treatment mechanism is built into the organic wastewater purification facility and the corresponding treatment equipment to make it more compact and easy to transport and install. The ozone treatment effect can be confirmed and used as a basis for designing facilities for facility improvement (adding an ozone treatment mechanism to existing facilities).

FIG. FIG. 3 is a front view of the same embodiment. The same plan view. Volume table for each layer.

Next, an embodiment of the present invention will be described. The demonstration device shown in the embodiment is composed of an adjustment tank 1, an aeration tank 2, a sedimentation tank 3, and a return sludge tank 4, and is equipped with an adjustment tank pump 5 and a return sludge pump 6 for forced circulation during wastewater treatment, as well as a blower (air pump) 7 for aeration treatment and an ozone generator 8 for ozone treatment.

The adjustment tank 1 has an actual capacity (corresponding capacity during treatment) of about 53 liters, and has a wire mesh 11 on the top surface that receives the wastewater to be treated (organic wastewater) A, and an aeration pipe 12 and an air diffuser pipe 12 on the bottom. An ozone discharge section 13 is provided, and a water level sensor 14 and a regulating tank pump 5 for pressure-feeding regulating tank water B in the regulating tank 1 to the aeration tank 2 are attached.

The aeration tank 2 has an actual capacity of about 61 liters, has a wire mesh 24 at the top, an advection pipe 21 in the middle to send the aeration tank water (aerated water) C to the settling tank 3, and a convection pipe 21 at the bottom. A diffuser pipe 22 and an ozone discharge part 23 are provided, and a return sludge pump 6 for returning return sludge tank water F from a return sludge tank 4 is attached.

The sedimentation tank 3 has a cylindrical shape with an actual capacity of about 16 liters, has a central cylindrical part 33 disposed at the center of the interior, connects the advection pipe 21 at the upper and lower intermediate points, and carries purified supernatant water (purified water) upward. ) An overflow weir 34 for receiving E and a discharge pipe 31 communicating with the overflow weir 34 are provided.

Further, the sedimentation tank 3 has an inverted conical shape at the lower end, and communicates with the return sludge tank 4 at the center of the lower end, so that the lower layer water D containing the sludge (excess activated sludge and difficult-to-decompose substances) remaining in the sedimentation tank 3 is formed. A sludge advection pipe 32 is provided to introduce the sludge into the return sludge tank 4. Furthermore, it is provided with a rotating lever 35a that rotates close to the inverted conical slope of the sedimentation tank 3, and a manual handle 35b that drives the rotating lever 35a.

The return sludge tank 4 has an actual capacity of about 10 liters and is connected to the outlet of the sludge transfer pipe 32 and the return sludge pump 6, and is provided with an aeration pipe 41 and an ozone release section 42 at the bottom.

Blower 7 has a capacity of 60 liters per minute and is connected to the aeration pipes 12, 22, and 41 of each tank to release air into each tank. A flow control valve (not shown) is installed in the supply line (stainless steel pipe) to each aeration pipe 12, 22, and 41.

The ozone generator 8 is composed of an oxygen generator and an ozone generator, and is connected to the ozone dischargers 13, 23, and 42 of each tank.

In addition, this device has predetermined equipment built into three trolleys A, B, and C, making it easy to install. A regulating tank 1 is installed in truck A, an aeration tank 2 is installed in truck B, and a settling tank 3, a return sludge tank 4, and a blower 7 are installed in truck C.

Therefore, this demonstration device can be easily installed by placing the carts A, B, and C at the intended installation location within an existing organic wastewater treatment facility, placing the ozone generator 8 nearby, assembling a pipeline configuration using stainless steel pipes, tubes, and flow path adjustment valves, connecting a designated power source, and arranging a control panel (not shown) that controls each operation.

To operate this device, the adjustment tank water from the existing wastewater treatment facility is injected into the adjustment tank 1, and the aeration tank water from the existing treatment tank is similarly injected into the aeration tank 2, settling tank 3, and return sludge tank 4. The adjustment tank pump 5 and the return sludge pump 6 are operated, the blower 7 and the ozone generator 8 are operated to adjust the amount of air released (aeration amount) and the amount of ozone released in each tank 1, 2, and 4, and then The demonstration device is operated by injecting organic wastewater (sewage to be treated) A, which is being purified at the treatment facility, into the adjustment tank 1.

Purification of organic sewage (sewage to be treated) A in the demonstration device involves setting and adjusting the amount of water to be treated in the adjustment tank 1, and pumping a predetermined amount (for example, 30 cc/min or 50 cc/min) into the aeration tank 2 with the adjustment tank pump 5. /min) of adjustment tank water B is transferred. The adjustment tank 1 receives wastewater A to be treated as detected by a water level sensor 14. In addition, since the wastewater A to be treated remains in the adjustment tank 1, aeration treatment and ozone treatment are performed. In particular, ozone treatment sterilizes and purifies and makes difficult-to-decompose substances easier to decompose.

In the aeration tank 2, aeration treatment and ozone treatment are performed, and the aerated water (aeration tank water) C flows into the settling tank 3 through the advection pipe 21.

In the settling tank 3, the aeration tank water C flows into the central tube 33 through the transfer pipe 21 and flows into the settling tank 3 from the lower opening of the central tube 33, so that the aerated water (aeration tank water) C flows downward in the central tube 33, promoting the settling of sludge. As a result, the sludge settles due to the settling separation action, and the supernatant water (purified water) E in the settling tank 3 flows into the overflow weir 34 and is discharged to the outside from the discharge pipe 31 as purified water E.

The settled sludge at the bottom of the settling tank 3 is appropriately stirred by the rotary lever 35a, and it is possible to prevent sludge floating, bad odor, etc., which is a denitrification phenomenon caused by solidification. At the same time, the return sludge pump 6 performs circulation among the return sludge tank 4, aeration tank 2, and settling tank 3 without any hindrance.

The bottom water D containing the settled sludge at the bottom of the settling tank 3 is sent to the return sludge tank 4 through the sludge transfer pipe 32 installed at the bottom of the settling tank 3. Further activation treatment and ozone treatment are also carried out in the return sludge tank 4, while the return sludge tank water F containing the excess activated sludge and hard-to-decompose substances is sent to the aeration tank 2 by the return sludge pump 6, where the sludge and hard-to-decompose substances are decomposed.

In particular, in the above treatment process, aeration treatment and ozone treatment (decomposition of organic matter and sludge by ozone) are performed in the adjustment tank 1, aeration tank 2, and return sludge tank 4, respectively. Rather than spot-extracting and confirming the ozone treatment effect on (sewage), it is possible to confirm the ozone treatment effect in actual purification treatment.

In addition, since ozone treatment and aeration treatment are performed in each treatment process (purification treatment in adjustment tank 1, aeration tank 2, and return sludge tank 4), it is important to know which treatment process and what treatment conditions (aeration amount and ozone This demonstration device will also be able to confirm whether the emission amount (emission amount) is appropriate for the purification treatment of organic wastewater at the treatment facility, and provide optimal improvement design data for applying ozone treatment at the treatment facility.

1 Adjustment tank 11 Wire mesh 12 Aeration pipe 13 Ozone release part 14 Water level sensor 2 Aeration tank 21 Advection pipe 22 Aeration pipe 23 Ozone release part 24 Wire mesh 3 Sedimentation tank 31 Discharge pipe 32 Sludge advection pipe 33 Central cylinder part 34 Overflow weir 35a Rotation Lever 35b Manual handle 4 Return sludge tank 41 Aeration tube 42 Ozone discharge section 5 Adjustment tank pump 6 Return sludge pump 7 Blower 8 Ozone generation section A Sewage to be treated (organic sewage)
B Adjustment tank water C Aeration tank water (aerated water)
D Lower water E Supernatant water (purified water)
F Return sludge tank water

Claims (3)

Equipped with an adjustment tank and an aeration tank having a sewage receiving volume of 50 to 65 liters, a settling tank and a return sludge tank corresponding to the volumes of the adjustment tank and aeration tank, an ozone generator and a blower with a predetermined output,
An aeration pipe connected to a blower is installed in the aeration tank, an ozone release section is installed in the return sludge tank, and an adjustment tank pump is installed between the adjustment tank and the aeration tank, and sludge is returned between the return sludge tank and the aeration tank. A pump is provided, the aeration tank and the settling tank are connected in the middle by an advection pipe, and the settling tank is provided with an overflow weir and a discharge pipe that communicates with the overflow weir, and a sludge advection pipe that communicates with the return sludge tank at the lower end. This is a demonstration device for organic sewage treatment that is constructed by connecting each tank. The organic wastewater treatment demonstration device according to claim 1, which is provided with an ozone release section connected to an ozone generator and an aeration pipe connected to a blower at appropriate positions below each of the adjustment tank, aeration tank, and return sludge tank. A central cylindrical part is disposed in the center of the settling tank, an advection pipe is connected to the central cylindrical part, and the lower part of the settling tank is formed into an inverted conical shape, and the sludge scraper rotates along the lower end surface. 3. The demonstration device for organic sewage treatment according to claim 1 or 2, further comprising a rotating lever for shifting.