JPH04354592A - Sewage treatment equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to improvements in sewage treatment equipment.

0002

[Prior Art] Conventionally, sewage treatment equipment includes a sedimentation separation tank or an anaerobic filter bed tank into which raw sewage flows, a contact aeration tank into which the sewage is advected from the sedimentation separation tank or the anaerobic filter bed tank, and a contact aeration tank into which the sewage is advected. A sewage treatment device is known that includes a sedimentation tank in which the wastewater is advected and a disinfection tank in which the sewage is finally disinfected and discharged to the outside. By the way, since the inside of these sewage treatment equipment is partitioned into multiple tanks, they tend to be large in size.In order to eliminate these drawbacks, a ceramic membrane module or a glass or plastic membrane module made of glass or plastic 0.1-6 is installed inside the contact aeration tank.
A sewage treatment system has been proposed that is equipped with a separation membrane module consisting of microporous tubes with a 0-micron opening, so that treated water can be filtered and suctioned and discharged directly to the outside, making it possible to omit a settling tank (for example, No. 2-63657).

0003

[Problems with the prior art] However, the treated water that is sequentially transferred in the above-mentioned sewage treatment equipment usually has a one-way flow, so suspended matter such as exfoliated sludge generated in each tank is directly advected to the next tank. However, it tends to eventually accumulate in the separation membrane module. Therefore, this causes the separation membrane module to become clogged, which requires early cleaning and the like, resulting in troublesome maintenance.

[0004] However, there are sewage treatment systems that are configured to return the peeled sludge generated when backwashing of the contact material is carried out in the contact aeration tank to the previous treatment tank, but this return is limited to the time of backwashing. There was a problem that suspended sludge generated during normal treatment could not be efficiently returned.

[0005]

SUMMARY OF THE INVENTION In view of the above drawbacks, the present invention provides a sewage treatment apparatus having a structure in which treated water is filtered and discharged by a separation membrane module, which reduces the frequency of clogging of the separation membrane module, and improves sewage purification efficiency. The purpose of this invention is to provide a wastewater treatment device that has particularly excellent denitrification effects.

[0006]

[Means for Solving the Problems] That is, the sewage treatment apparatus of the present invention comprises a sedimentation separation tank or an anaerobic filter bed tank and a contact aeration tank, into which raw sewage water is sequentially advected, and the above-mentioned sediment is removed from the contact aeration tank. A sewage return pipe is provided to constantly or periodically return sewage to the separation tank or anaerobic filter bed tank, and a suction type membrane separator equipped with a backwashing device and a suction pump are installed in the contact aeration tank. The advection ports of the treated water in each of the sedimentation separation tanks or the anaerobic filter bed tank and the contact aeration tank have a width in the vertical vertical direction, and the entire volume of the sewage treatment equipment corresponding to the width is the flow rate adjustment space. It is characterized by being a product.

[0007]

[Example] Next, an example of the present invention will be described. FIG. 1 is a sectional view of an embodiment of the invention.

The sewage treatment apparatus A of the present invention consists of a sedimentation separation tank or an anaerobic filter bed tank 1 (in the illustrated example, an anaerobic filter bed tank first chamber 1A and a second chamber 1B) into which raw sewage water flows, and then treated water. The system consists of a contact aeration tank 2 in which sewage is advected, and the sewage is constantly transported from the contact aeration tank 2 to the sedimentation separation tank or the anaerobic filter bed tank 1 (the illustrated example is the anaerobic filter bed tank first chamber 1A), or controlled by a timer 3A. A sewage return pipe 3 is provided to periodically return the sewage.
In addition, a suction type membrane separator 5 equipped with a backwashing device 4 and a suction pump 6 are installed in the contact aeration tank 2. The advection ports 7, 7 have a width d in the vertical up-down direction, and the volume of the entire inside of the sewage treatment apparatus (the shaded area in the figure) corresponding to this width d is configured as the empty space for flow rate adjustment.

In the above embodiment, the membrane module of the membrane separator 5 is a ceramic membrane module or a separation membrane module made of glass or plastic microporous tubes with an opening of 0.1 to 60 microns. Membrane modules having a diameter of preferably 0.5 to 20 microns are used. Further, 3B in the figure indicates a flow rate adjustment box, which is provided for the purpose of controlling the amount of water to be returned, and is configured so that surplus water is returned to the contact aeration tank 2 through a droplet 3C provided in the flow rate adjustment box 3B. . Backwash device 4
consists of an air supply pipe 4B equipped with a blower 4A, and when the need arises to clean the membrane separator 5, air is supplied and clogging is eliminated by the ejected air. Further, in the figure, 8 and 9 indicate a filter medium, and 10 indicates a contact material.

0010

[Function] In the sewage treatment apparatus A of the present invention, coarse solids are removed from the raw sewage water that flows into the first chamber 1A of the anaerobic filter bed tank, and while a certain degree of anaerobic treatment is performed here, the anaerobic filter in the next tank is It is advected to the second floor tank chamber 1B. Anaerobic treatment is further performed in this second chamber 1B of the anaerobic filter bed tank, and then aeration is carried out by advection to contact aeration tank 2, where aerobic treatment is performed. After this aerobic treatment is performed, solid matter and the like are filtered out by the membrane separator 5, and only the treated water is discharged to the outside by the suction pump 6. In the above treatment process, exfoliated sludge is generated in the second chamber 1B of the anaerobic filter bed tank or the contact aeration tank 2, but these floating substances are removed from the anaerobic filter bed tank by the sewage return pipe 3 that operates constantly or periodically. It is returned to the first room 1A.

Furthermore, since the nitrifying solution is supplied to the first chamber 1A of the anaerobic filter bed tank together with suspended matter such as exfoliated sludge, nitrification and denitrification can be carried out efficiently in the anaerobic treatment tank. Further, since the advection ports 7, 7 of each tank have a width d in the vertical up-down direction, the treated water surface can move up and down within this width, and therefore this becomes an empty space for adjusting the flow rate.

0012

Effects of the Invention As explained above, this invention returns sewage from the final treatment tank to the previous tank at all times or periodically, regardless of backwashing, so that suspended sludge in the contact aeration tank 2 does not accumulate, and clogging of the membrane module is effectively prevented. In addition, since the upper space of the septic tank is used for flow rate adjustment, even if there is a temporary increase in sewage generation, it will be absorbed, preventing short-paths of treated sewage in each tank, and ensuring complete sewage treatment. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the invention.

[Explanation of symbols]

A Sewage treatment device 1 Sedimentation separation tank or anaerobic filter bed tank 2 Contact aeration tank 3 Sewage return pipe 3A Flow rate adjustment box 4 Backwash device 5 Suction type membrane separation device 6 Suction pump 7 Advection port d Vertical width of the advection port

Claims (1)

[Claims] Claim 1: Consisting of a sedimentation separation tank or an anaerobic filter bed tank and a contact aeration tank to which raw sewage water is sequentially advected, sewage is constantly or periodically transferred from the contact aeration tank to the sedimentation separation tank or the anaerobic filter bed tank. A suction type membrane separator equipped with a backwashing device and a suction pump are provided in the contact aeration tank, and the contact aeration tank is provided with a suction type membrane separator equipped with a backwashing device and a suction pump, which makes contact with each of the sedimentation separation tanks or anaerobic filter bed tanks. A sewage treatment device characterized in that a treated water advection port in an aeration tank has a width in a vertical up-down direction, and a volume of the entire interior of the sewage treatment device corresponding to the width is used as a flow rate adjustment empty space.