JPH0713497U - Wastewater treatment equipment - Google Patents

Abstract

(57) [Summary] [Purpose] Alkaline organic wastewater can be installed in a relatively small installation area, and alkaline neutralization can be done easily, and maintenance is easy because daily maintenance is unnecessary. Furthermore, the neutralization of alkalinity can be performed with high safety. [Structure] A pretreatment tank such as a pH adjusting tank 2 or a flow rate adjusting tank 9 and a biological treatment tank 4 are provided in the tank main body 1 with the pretreatment tank upstream, and an air diffuser 8a is provided in the pretreatment tank. The air diffuser 8a is installed and connected to the upper space 3a of the biological treatment apparatus 3 via a blower 7a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wastewater treatment device for purifying alkaline organic wastewater discharged from milking line washing water, drinking water production line, food washing bottle line and the like.

[0002]

[Prior art]

 In order to purify alkaline organic wastewater by using biological treatment methods such as activated sludge method and catalytic oxidation method, pH adjustment must be performed before biological treatment in order to prevent the activity of treated microorganisms from decreasing due to its alkalinity. There is a need to do. As a conventional general method, there is a method in which a pH adjusting tank, a PH sensor, a PH adjuster, a chemical tank, and a chemical injection pump are provided, and an acidic chemical such as sulfuric acid or hydrochloric acid is added until a predetermined pH is reached. There is also a method of installing a carbon dioxide gas cylinder, introducing the carbon dioxide gas into a pH adjusting tank, and adjusting the PH with the carbon dioxide gas.

[0003]

[Problems to be solved by the device]

 The method using an acidic chemical requires various devices and equipment for pH adjustment, as exemplified in the previous section, and requires maintenance such as calibration of the PH sensor and replenishment of chemicals. Furthermore, since the acidic chemicals that are commonly used are deleterious substances, etc., dangers during use and storage are predicted. Even with the method using a carbon dioxide gas cylinder, safety management as high-pressure gas and regular gas replenishment are required.

The present invention has been made in view of the above, and requires only a relatively small installation area for the purification of alkaline organic wastewater, has a simple configuration for neutralizing alkaline, and does not require daily maintenance. It is an object of the present invention to provide a wastewater purification device that is easy to maintain and manage, and that can perform alkaline neutralization with high safety.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the wastewater purifying apparatus according to the present invention includes a pretreatment tank such as a pH adjusting tank 2 or a flow rate adjusting tank 9 and a biological treatment tank 3 in the tank main body 1 upstream of the pretreatment tank. The air diffuser 8a is installed inside the pretreatment tank, and the air diffuser 8a is connected to the upper space 3a of the biological treatment apparatus 3 via a blower 7a.

[0006]

[Work]

 The treatment gas containing carbon dioxide generated in the biological treatment tank 3 is diffused in the treated water in the pretreatment tank, whereby the alkalinity in the treated water is neutralized.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which a PH adjusting tank 2 and a biological treatment tank 3 are provided in a tank body 1 with the PH adjusting tank 2 on the upstream side. An inflow port 4 is provided on the side and an outflow port 5 is provided on the biological treatment tank 3 side, and both tanks 2 and 3 are partitioned by an overflow wall 6.

At the bottom of both tanks 2 and 3, diffusers 8a and 8b connected to blowers 7a and 7b are installed. The inlet side of the blower 7b connected to the air diffuser 8b on the biological treatment tank 3 side is open to the atmosphere, but the inlet side of the blower 7a connected to the air diffuser 8a on the PH adjusting tank 2 side is the biological treatment tank. 3 is connected to the upper space 3a.

In the above-mentioned configuration, the wastewater to be treated flows into the pH adjusting tank 2, then flows into the biological treatment tank 3 over the overflow wall 6, where it is biologically treated and discharged from the outlet 5. At this time, in the biological treatment tank 3, the treatment gas containing carbon dioxide in the upper space 3a of the biological treatment tank 3 is aerated by air bubbles from the aeration device 8b, and is oxidized by microorganisms to oxidize organic substances and also to synthesize and oxidize cellular substances. Occurs. Then, the treated gas is diffused by the blower 7a on the PH adjusting tank 2 side by the diffuser 8a on the PH adjusting tank 2 side, and is brought into contact with the waste water to be treated flowing into the PH adjusting tank 2.

Since the treated gas generated in the biological treatment tank 3 contains carbon dioxide, it easily dissolves in alkaline wastewater, and by dissolving it in this wastewater, the pH of this is changed to the acidic side. Be neutralized. The concentration of carbon dioxide in the treated gas at this time can be roughly estimated from the amount of organic substances flowing into the biological treatment tank 3, the concentration of microorganisms in the tank, the aeration intensity, and the like.

At this time, since the acidic component of the treated gas is mainly carbon dioxide, which is a weak acid, and its concentration is low, even if a large amount of generated gas is used for neutralization for a long time, the alkaline wastewater PH does not exceed neutral and becomes strongly acidic. Therefore, even without the PH adjustment mechanism required in the prior art, that is, without the PH sensor and the PH adjuster, the PH does not drop too much and does not adversely affect the biological treatment in the subsequent stage.

FIG. 2 shows a second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the flow rate adjusting tank is provided upstream of the biological treatment tank 3 instead of the PH adjusting tank 2. 9 is provided. The flow rate adjusting tank 9 is provided with a pump 10 for sending the wastewater therein to the biological treatment tank 3 and an air diffuser 8a similar to the PH adjusting tank 2 described above. In this embodiment, PH adjustment is performed in the flow rate adjusting tank 9.

FIGS. 3 and 4 show a modification of the first embodiment shown in FIG. 1. What is shown in FIG. 3 is an auxiliary tank 11 on the downstream side of the tank body 1 shown in FIG. The multi-stage biological treatment tank 12 is connected via the above, and the upper space 12a of this multi-stage biological treatment tank 12 is connected to the blower 7a on the PH adjusting tank 2 side. With this configuration, other organic wastewater can join the auxiliary tank 11 on the way, and the organic wastewater with a higher concentration can flow into the auxiliary tank 11 to cause the dioxide in the gas generated in the multi-stage biological treatment tank 12 to flow. The concentration of acidic gas such as carbon can be increased, and the neutralizing action in the pH adjusting tank 2 can be more effectively performed. On the other hand, in the one shown in FIG. It is directly connected to the biological treatment tank 3 in an integrated manner.

FIGS. 5 and 6 show a modification of the second embodiment shown in FIG. 2, in which the auxiliary tank 11 is provided downstream of the tank body 1 shown in FIG. The multi-stage biological treatment tank 12 'is connected via the above, and the upper space 12b' of this multi-stage biological treatment tank 12 'is connected to the blower 7a on the PH adjusting tank 2 side. On the other hand, the structure shown in FIG. 6 has a structure in which a multi-stage biological treatment tank 12 'is directly connected to the biological treatment tank 3 on the side of the tank main body 1 in an integrated manner.

FIGS. 7 and 8 show the configuration of the apparatus shown in FIGS. 5 and 6 in which the arrangement of each part is changed. As a result of treating the washing wastewater of the milking line with the apparatus of each of the above-mentioned examples, the wastewater PH can be neutralized from about 10 to 7 to 8, and as a result, the biological treatment proceeds smoothly, and the final wastewater BOD (biochemical Oxygen demand) was as good as 10-15 ppm.

[0016]

[Effect of device]

 According to the present invention, the installation area of the alkaline organic waste water is relatively small, the alkaline neutralization is simple, and the daily maintenance is not required, and the maintenance is easy. Neutralization can be performed with high safety.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a first embodiment of the present invention.

FIG. 2 is a structural explanatory view showing a second embodiment of the present invention.

FIG. 3 is a structural explanatory view showing a modified example of the first embodiment of the present invention.

FIG. 4 is a structural explanatory view showing another modification of the first embodiment of the present invention.

FIG. 5 is a structural explanatory view showing a modified example of the second embodiment of the present invention.

FIG. 6 is a structural explanatory view showing another modification of the second embodiment of the present invention.

FIG. 7 is a plan view showing a configuration of the apparatus shown in FIG. 5 in which the arrangement of each part is changed.

FIG. 8 is a plan view showing a configuration of the apparatus shown in FIG. 6 in which the arrangement of each part is changed.

[Explanation of symbols]

1 ... Tank main body, 2 ... PH adjusting tank, 3 ... Biological treatment tank, 3a,
12a, 12a '... Upper space, 4 ... Inlet, 5 ... Outlet, 6 ... Overflow wall, 7a, 7b ... Blower, 8a, 8b ... Vaporizer, 9 ... Flow rate adjusting tank, 10 ... Pump, 11 ... Auxiliary Tank, 12 ... Multi-stage biological treatment tank.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hajime Tanabe Hajime Tanabe 1-chome, Kita 3-jo Nishi 1-chome, Chuo-ku, Sapporo, Hokkaido Within Daido Hokusan Co., Ltd. Daido Hokusan Co., Ltd. (72) Inventor Masami Yamamoto 1-6-3 Ohashi, Meguro-ku, Tokyo Komatsu Kasei Co., Ltd. (72) Inventor Yuji Suzuki 2082 Junwell, Ichihara-shi, Chiba Komatsu Kasei Co., Ltd. Chiba factory

Claims (1)

[Scope of utility model registration request] 1. A pretreatment stage such as a pH adjustment bath 2 or a flow rate adjustment bath 9 and a biological treatment bath 3 are provided in the bath main body 1 with the pretreatment stage upstream, and air is diffused in the pretreatment stage. Device 8
A wastewater treatment equipment is characterized in that a is installed and the air diffuser 8a is connected to the upper space 3a of the biological treatment equipment 3 via a blower 7a.