JPS6082191A - Method and device for treating sewage by microorganism - Google Patents

Abstract

PURPOSE:To perform aerobic and anaerobic treatment with one biological reaction vessel by segmenting the central part of the biological reaction vessel by a partition wall to block vessels of which the water surface parts and bottoms are communicated with each other, disposing aerators in the respective vessels and aerating alternately the paired block vessels. CONSTITUTION:Sewage is gradually admitted into a biological reaction vessel 1 and only the block vessel 3 on the left side is aerated after air diffusing cylinders 5, 6 are concealed in the sewage. Aerobic state is created in the vessel 3 and the org. material is decomposed or the ammonia in the sewage is oxidized to a nitric acid by the effect of the microorganisms sticking to a catalyst material 21. If both right and left block vessels 3, 4 are aerated simultaneously for 5-15min at the timing when suspended matter seems to be filled among the particles of the material 21, the particles are rubbed against each other and the sludge sticking thereto is dislodged. The backwashing effect of a filter basin is thus obtd. The operation of a blower 12 is stopped and when the sludge settles in the bottom of a conical-shaped cavity 1a after resting, the excess sludge is discharged.

Description

[Detailed Description of the Invention] Conventionally, aerobic treatment of sewage by microorganisms has been efficient in decomposing organic matter, but even if nitrogen can be oxidized by nitric acid nitrogen extraction, it can be converted into nitrogen gas and released into the atmosphere. However, it lacks the ability to denitrify gas until it is released into the atmosphere, so it has no choice but to rely on anaerobic treatment. This invention performs aerobic and anaerobic treatment in one biological reaction tank, and also aims to clarify the treated water.Next, the 7+J type will be explained with reference to the illustrated embodiment.

Example 1. As shown in Figures 1 and 2, the lower part is a conical cavity 1.
By installing a partition wall 2 vertically in the center of the biological reaction tank l designated as d, with the upper edge at a position slightly below the upper limit water level and the underlined at a position higher than the conical cavity 1a, and both sides of the partition wall 2 reaching the tank walls. ,
It is divided into two tanks 3 and 4 in which the vicinity of the water surface and the bottom are connected to each other.

At the bottoms of both tanks 3 and 4, aeration devices 5 and 6 such as diffuser pipes are installed approximately in the center of both tanks, and at the portions where the air pipes 7 and 8 of each device 5 and 6 come out of the tanks, automatic Air supply valves 9 and 10 are installed that can be opened and closed automatically, and these air supply valves 9. The IO is electrically connected to the control panel 11, and the air pipes 7 and 8 are connected to the blower 12 which can be operated automatically by the control panel 11 so that a timer can be opened and closed individually. Both aeration devices 5 and 6 are constructed so that they can be individually pulled out of the tank and inspected.

Furthermore, a waste water supply pipe 13 is opened directly above the partition wall 2, a treated water outlet 14 is provided at the upper part of the conical cavity 1a, and a drained conical cavity 1 is provided with a treated water outlet 14 at the top of the conical cavity 1a.
A sludge discharge port 15 is arranged at the bottom of the cone a, and control valves 18 and 1 are provided in the liquid feed pipes 16 and 17 led out from the sewage supply pipe 13, the take-out port 14, and the discharge port 15, respectively.
9 and 20 are provided and electrically connected to the control panel 11,
Enables opening/closing control.

On the other hand, in this embodiment, expanded polystyrene particles are used as the contact material 21, and a mesh frame 22 is horizontally extended near the fresh water level to prevent the contact material 21 particles from floating and swelling.

In this way, sewage gradually flows into the biological reaction tank 1, and after the aeration pipes 5 and 6 become hidden, the aeration operation is performed only on the left side of the figure Prg:'. In this case, the contact material 21 tends to be pushed to one side by the air bubbles floating up from the aeration pipe 5, but in both tanks 3 on the left side, it becomes an aerobic state and resists adhesion to the contact material 21. Organic matter is decomposed by the action of microorganisms, and ammonia in wastewater is oxidized to nitric acid. This aeration time varies depending on the location and properties of the wastewater, and may take a cycle of 21 to 23 hours or as short as 1 to 12 hours. Then, through the aeration operation, the wastewater automatically climbs over the upper edge of the partition wall 2 and enters both tanks 4 on the right side, which are not aerated.Here, it becomes anaerobic and flows directly above the partition wall 2 due to the removal of WBI. When some of the sewage flows in, it is used as a carbon source to decompose nitric acid into nitrogen gas and carbon dioxide and release it into the atmosphere.
The wastewater is also subjected to anaerobic digestion. At this time, the alkalinity recovered in the anaerobic section is circulated back to the aerobic section.
It helps to prevent the pH value from decreasing in the aerobic part, and allows rational nitrogen nitrification and denitrification operation. Then, when the treated water valve is opened at an appropriate time, the treated water in the right image tank 4 will quietly fall between the particles of the contact material 21, and floating matter will be captured by the contact material particles as if being filtered. , clear treated water can be extracted.

After that, when it seems that the particles of the contact material 21 are filled with floating matter, both the left and right tanks 3 and 4 are heated at the same time for 5 to 15 minutes.
If the air is aired all at once for about one minute, the particles will rub against each other due to the water flow moving with the rising air bubbles, and the fallen sludge will fall off, providing a backwashing effect for the filter basin, so the operation of the blower 12 will be stopped. 1. Let stand for 10 minutes to 2 hours. When the sludge suspended in the liquid settles to the bottom of the conical cavity 1a, the excess sludge is strained to be discharged. Therefore, the standing period and f
During the mud pumping period Q, the blower operation is not stopped. Next, as shown in FIG. 2, both tanks 4 on the right side are aerated and sewage treatment is performed in the same manner.

The above is the mode of treatment operation, and the opening and closing of the valley pipe valve can be automatically controlled by a timer once the quality of the wastewater is determined.

Example 2. In the case of this example shown in FIGS. 3 and 4, the reaction tank etc. are the same as in Example 1, but the contact moon 21 is not made into granules, and an inclined plate device with protruding ray fins and a honeycomb material are used. A fixed precipitation separation device 21a' such as y is used as a fixed contact material. Therefore, in the case of this example, the solid-liquid separation operation based on the contact phase is not a filtration effect but a precipitation effect. Other processing operations and effects are as in Example 1. In the figure, Example 1 is similar to the case of
Please give the same reference numerals and explanations to the same or equivalent parts as ゜? 1 omitted.

Example 3 In this example, as shown in Fig. 5, a plurality of biological reactors 1, 1, .
Only the solid first generation distribution tank 22 is provided separately. In this case, the movement of liquid between reactors in series is due to the difference in water level. In this example as well, Example 1. The same or equivalent parts are given the same reference numerals and their explanations are omitted.

Since this invention is carried out as described above, (1) oxidative decomposition of organic matter and nitrogen, etc. and denitrification can be performed simultaneously.

2) When floating lachrymal material is used during the contact period, solid-liquid separation becomes biological filtration in the anaerobic section, resulting in clear treated water.

3) When using floating lr materials, backwashing of offshore materials can be easily performed.

4) Even in the case of catalytic oxidation with one blast of air on the entire floor, there is no problem in pulling up the diffuser cylinder in the &Ilf air section on one side, so maintenance and inspection of the diffuser can be performed.

5) The inflow of sewage naturally flows to the anaerobic part due to the aeration flow, and the alkali content regenerated in the anaerobic part is recycled to the aerobic part, so nitrification and denitrification of desired elements can be carried out rationally. Benefits arise.

[Brief explanation of drawings]

1 and 2 are vertical cross-sectional views showing the working order of the first embodiment of this invention, FIG. 3 (at to Iel are operation example diagrams showing the second embodiment, and FIG. Fig. 5 is a vertical sectional view of the apparatus of the example, and Fig. 5 is a layout diagram of the third embodiment. 21 It is a contact material. Patent applicant Suido Kiko Co., Ltd. - Jλ continuation 111 official text (method) March 8, 1980 Ll Commissioner of the Patent Office,; 1 Kazuo Sugi 1, Indication of case 1988, Purpose'1 Application No. 190935 2, Title of invention Sewage treatment method and device using microorganisms 3, amended; Subject (as shown in the attached sheet) ('7, contents of amendment) 1) In the specification, ``and Figure 4'' in line 5 of the 8th summer was corrected as follows: ``through Figure 5'' 2) Line 15 of the same page Correct ``Figure 5'' in the following line [Figure 6 J 3) Correct ``indicates'' in line 11 on page 10 as follows: ``Status diagram of each work stage in Figure 4'' is Figure 3 (Q)
4) "Figure 4" on the same page should be corrected as follows and "Figure 5" 5) "Figure 5" in line 12 of the same page should be corrected as follows. “Figure 6” The drawing is corrected as shown in the attached sheet.

Claims (1)

[Claims] 1. In a sewage biological treatment method that uses both aerobic and anaerobic microbial treatment, water is supplied from directly above the wall of one section by alternately aerating both tanks for a certain period of time in the center of the biological reaction tank. In the aeration section, organic matter is oxidized and nitrogen compounds are nitrified through aerobic treatment in the presence of a contact material, while in the anaerobic section on the aeration stop side, some of the organic matter in the inflowing sewage is reduced and desorbed as a carbon source. In addition to performing nitrogen treatment and anaerobic biological treatment,
A sewage treatment method using microorganisms that is characterized by a series of steps including, in addition to image processing, appropriate standing, solid-liquid separation, sludge discharge, and treated water discharge operations. 2. A sewage biological treatment device that performs aerobic and anaerobic microbial treatment by interposing contact materials in the tank: 1. - 7. A partition wall is hung in the center of the biological reaction tank to raise the reaction tank to the water surface. The tank is divided into a pair of tanks with optical communication between the top and bottom, and each tank is equipped with an aeration device connected to the blower via an air supply valve that enables intermittent operation. A sewage supply port is provided directly above the wall of one compartment, and a sludge discharge port and a treated water intake port are provided in the tank body.By alternately aerating both tanks for a certain period of time, the aeration section A sewage treatment device is characterized in that an aerobic treatment is performed in the anaerobic section on the aeration stop side, and an anaerobic treatment is performed in the anaerobic section on the aeration stop side.