JPS5932999A - Disposal of organic liquid waste - Google Patents

Abstract

PURPOSE:To contrive efficient dephosphorization in parallel with the removal of BOD from organic liquid waste and its nitrification-denitrification, by anaerobically treating a liquid to be treated while adding activated sludge to it, and then simultaneously performing aeration and nitrification using a microbic bed on which nitrifying bacteria are implanted. CONSTITUTION:A liquid 11 to be treated, i.e. organic liquid waste containing BOD, phosphorus and reduced nitrogen compounds such as NH4<+>, is introduced into an anaerobic tank 1, mixed with returned activated sludge 15 and anaerobically treated by agitatively mixing it under a condition substantially free from any of DO and NOX, to discharge phosphorus from the activated sludge and to absorb BOD. Thereafter, the anaerobically treated liquid 12 is introduced into an aeration tank 2 and aerated therein while oxidatively nitrifying NH4<+> into NOX by nitrifying bacteria implanted on a microbic bed 3. Hereon, phosphorus at the site of the solution is absorbed in the sludge again. The aerobically nitrified liquid 13 is then introduced into the final precipitation pool 4 to separate the treated liquid 14. A part of precipitating activated sludge is withdrawn as excess sludge 16, while most of it is circulated as returned activated sludge 15 to the anaerobic tank 1 after agitating it in a denitrification tank 5 for a predetermined time at need to remove NOX.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to 41 organic wastes (Bt
) l)') Containing nitrogen, phosphorus together with -J-n) A method for treating ζ water in organic form, in particular with a phosphorus content of 18'
：、Ii+s+Generating sludge 1・'ko、1. "Te BOD l &> length and nitrification, rumors, (-7〈is B O1
1) Removal and nitrification and denitrification? j' L, -(-1+),
3 yQ Kan (Q゛) Lee'1) ↑ Reluctance to try to leave - I (Denpo +'Q Ryo11 (2 ('u, l-J"i) thing).

Anaerobic-aerobic 1 no, ! (,H975IL fiiJ
Ij2 vko 1+] La' Nori /
Biological Lee developed by J-Jl, *ll + Tsukasa
PI liquid iMi: At the input end, ■) 0 is also No.
In addition, it is also possible to use techniques such as installing a large anaerobic tank. iM draft: MC, J,
L. Harnard: A Review of
Biological PhoSphorus Rem
oval in thtlAct, 1vated Sb
+dgeProcess 1Water SA Vo
l, 2. IFr3. According to A., July 1976), activated sludge with high phosphorus accumulation is produced by this process, and
), it is said that not only nitrogen (+1;/) can be removed with high efficiency. This technology is also being researched in the United States, where it is claimed that bulking can be suppressed by such a process configuration (M, 5pector US
Patent 4.056.465).

The present inventors were also interested in this technology, and investigated its technical effects through indoor experiments using synthetic water and pilot plant-scale experiments using actual sewage. the result,
He acknowledged that several problems were understood and that much improvement was needed to broaden the applicability of this technology. In particular, the fact that favorable operating conditions for phosphorus removal and improvement of sludge sedimentation do not match with ensuring sufficient nitrification even during low water temperature periods was the basis for conceiving the present invention.

In the anaerobic-aerobic method, the phosphorus t removed within the system is equal to the amount of phosphorus contained in activated sludge produced within the system. Therefore, in steady state, the following relationship is obtained: ΔP = φ・ΔX ζ where ΔP: amount of phosphorus removed in the system per day [K9/
day]φ:M■, phosphorus content in VSS [kg-P/k17
-VS S 1llK generated within the lΔX° system MLVS
S M (L9/'l-1) The biggest reason why the anaerobic-aerobic method removes phosphorus better than the normal activated sludge method is that the phosphorus content (φ) is 15 times higher than that of the normal method. -3
It's twice as expensive. This value varies depending on the water quality of the liquid to be treated, but from the viewpoint of operation, it varies depending on the aerated sludge. This aerated sludge ratio is a numerical value defined as follows.

,. =VX- ΔX where θ °Aerated sludge age (days) VX ME and VSS present in the mixed liquid in the aeration tank: (Kp
) ΔX: M LVS S 181 that occurs in the system in one day
'(K9/El) shown in Figure 1 (~darin content (φ)
The relationship between the aerated sludge age and the aerated sludge age (θ) was determined by the present inventors
This is a result of a laboratory experiment using synthetic sewage containing glucose/yeast extract as the main component, but as understood from the relationship diagram, the phosphorus content (φ) is The shorter the time, the bigger the problem, especially when the aerated sludge period is 7 days or less. The amount of MLVSS generated in the system (ΔX
) also tends to increase as the aerated sludge age becomes shorter, and from the viewpoint of phosphorus removal, the aerated sludge age is better than the shorter t.

On the other hand, the settling property of activated sludge is also better as the aerated sludge period is shorter. Figure 1 shows the S of the activated sludge prepared in the above experiment.
The relationship between VI and aerated sludge age is also shown, and as can be understood from this figure, when the aerated sludge age is 51] or higher, the sedimentation properties become extremely good. No. 1 is omitted in this figure. However, when the aerated sludge period reaches 5 days, the activated sludge becomes sedimentary and fz <, i7! ', it also became highly compressible,
It is easily concentrated (in 6 hours) to more than 30 (100~, //).
] Moreover, if the aerated sludge order i) 5 g] or less,
Not only filtration and final sedimentation tanks but also sludge treatment facilities such as thickening tanks can be made phase-resistant.

As mentioned above, from the viewpoint of phosphorus removal and sedimentation of activated sludge, the shorter the aeration period, the better. 1. , Is it all about the driving operation of the scorching aeration sludge order? There's no way I'm superior in ll. The biggest drawback is instability or cessation of nitrification.

Instability or stoppage of nitrification can be achieved by applying the principles of the anaerobic-aerobic method to the circulating nitrification-denitrification method.
For the modified method, the nitrogen removal mechanism I.9.(1) is
(Of course, it is dangerous and fatal, but BOI) Anaerobic form of activated sludge for the purpose of collecting/removing sludge
, C is also not preferable for the L method. (Persimmon air - light air 11, C settles in the final settling tank, and when the live juice sewage sludge vaporizes, phosphorus is released, so the aeration tank C is in good condition./
Even if removal is carried out, the phosphorus content of the treated water remains high. The first 'Iri decision is
Vfr is added to the maximum P precipitation iTo, and NOx OJ is added to the mixed solution.
To /N021) k exist (i'-, i.e., to make the mixture l night ni 11. "t,, 71). In this way, to make i1 portrait", ・keba, N The phenomenon in which O-x acts as a phosphorus release inhibitor and dampens the treated water/concentrate can be prevented. However, in order to achieve stable nitrification using the anaerobic-aerobic method introduced in rrYi, more than one aerated sludge is required, which corresponds to the temperature of the treated solution as described in F. be.

25℃° 5.0 days or more 15℃" 88[1 or more 20℃ + 7.0 days or more 1[')℃: 1688 or more] In this way, the conventional anaerobic-aerobic method is used for long aeration of sludge for nitrification. However, the growth rate of nitrifying bacteria that performs nitrification is very slow, so if you know the sludge aging rate and replace the activated sludge quickly, the nitrifying bacteria will increase in the sludge. This is understood to be due to the fact that it becomes impossible to control the sludge.Especially at low processing liquid temperatures, the aeration of sludge is essential for nitrification.
In view of phosphorus removal and sedimentation properties of activated sludge, the preferable range of aerated sludge is 7.

The purpose of the present invention is to effectively perform the phosphorus removal and sludge settling properties inherent in such conventional anaerobic-aerobic technology.
The objective is to resolve the conflict between F conversion operation status, stable operation status, and operation status 4/l that ensures nitrification.

In other words, (1) ensure stable nitrification even at low processing liquid temperatures, (2) produce activated sludge with a high phosphorus content, (3) produce activated sludge with good settling properties, and (4) prevent sedimentation. The revised anaerobic-θf pneumatic method f=a method, which can minimize phosphorus elution from sludge into treated water, has been introduced in this book. The feature of the invention is that the conventional ρ-anaerobic method allows phosphorus-accumulating microorganisms and nitrifying bacteria to coexist in an active F1 sludge, thereby simultaneously removing phosphorus and nitrification. Changed where I was, nitrification & J, 10 and [7 and 11Y
Inside the tank, nitrifying bacteria are used in the microbial bed installed at the rear of the aeration tank to remove some phosphorus from the aeration sludge ordinance from the perspective of nitrification. From the viewpoint of the sludge settling property and the sludge settling property, it is possible to operate the sludge at a low aeration rate.

- In other words, the basic facility configuration is the same as the conventional aerobic method, but inside the aeration tank or at the rear of the aeration tank there is a fixed bed such as Hanikano, a rotating disk, etc. The mixed liquid flowing out from the previous treatment process such as anaerobic treatment and denitrification treatment is treated as a 1. In parallel, the method of arranging a microbial bed in the aeration tank is different from the conventional activated sludge method, as in 7. However, with this technology, the BOD of the liquid to be treated flows into the aeration tank. BOI) more oxidizing bacteria adhere, forming a microbial bed (BOI) as E droplets.
At the point where the rate of increase of
ot, or 1.2 Akira Kikura's 14 go, 11, liquid to be treated 130
Most of D is anaerobically adsorbed to the activated sludge that accumulates in the tit anaerobic tank, so K is absorbed into the mixed liquid flowing into the aeration tank.
BOI) Oxidizing bacteria can be utilized.
"is relative to the nitrifying bacteria h1 at a ratio of 1-./, p noi:
(It turns out. Then, in 5 minutes, h1/- to the anaerobic tank 7.-fl.
1. In comparison with the conventional activated sludge method, the present invention has a more stable nitrification power II.
l R'+) K: :l 7>.

J? , +, 1t7), t: For the eel mechanism, conventional anaerobic-preferring, t, l, (l small lI material bed of 11.4 u L
, In the present invention, the aerated sludge period is t"j (T is also '〃sif'lr, and the aeration is possible. operation and complete nitrification.
4. Each implementation of the invention? J b'Y 'a: 'A'
? I will clarify.

The second example is B C) i) Removal, phosphorus removal and?
This is a case where the main purpose is to convert il' into I7. BOD,
l) Reduced nitrogen compounds such as No. 5j and N84 are also
Cover ■ 1 ((1st line) 1) Both O and Noma are good in terms of length T1
I don't like the existence of 7. , (-Re-Ware Iko ni Spear 1h Le') / Accumulative growth 41 things,
Sot7> 4111] The f・I inner sun is converted into soluble phosphorus. BOI) dog iiB part Oko 1 activated sludge 1 (non-oxidizing = 1)
11 times, 41 times ψ1 is accumulated as 1, thus I7 is 11 formed it'A- Anaerobically treated mixed liquid 1
2 'JTF aeration ('Fl 2 (C, ', I'F
#1, ζ Trowel 'Ki lzodokoro' 111 all received. This aeration process absorbs phosphorus present on the solution side while oxidizing the organic matter present in the activated sludge 6.1. Storage o'll [
In order to achieve this accumulation efficiency distribution, the aerated sludge period defined above should be relatively short, preferably <1 to 7 days. It is preferable to make one. Such a short aeration sludge period operation does not permit the presence of nitrifying bacteria in the activated sludge flocs, especially at low temperatures, but in the present invention, the presence of nitrifying bacteria on the microbial bed 3 installed in the aeration tank 2 is eliminated. Compensates for bacteria removal.

The example in FIG. 2 shows an example in which a fixed bed is used as the microbial bed 3, but in such fixed microbial bed configurations H and l-,
Chicob-like plastics with a large surface area and less clutter are preferred. When installing all of these, it is necessary to take measures to prevent the activated sludge in the mixed solution from settling. A fixed microbial bed (
Using a rotating microbial bed, such as a KBi1 disc,
To reduce such construction restrictions. Another method is to suspend the mixed liquid in a plastic hole, etc., which has approximately the same specific gravity as the mixed liquid. However, in this case, it is necessary to take measures such as installing a screen or the like at the outflow end of the aeration tank 2 to collect this suspended microbial bed and returning it to the inflow end of the aeration tank 2 or (to the central part of the 5th floor). 3. Using any of these microbial bed techniques, if appropriate conditions such as A system is formed,
Anaerobically treated mixture f1. NN4 &, J included in I2
Oxidized to N.

The aerated nitrification process produced in this way! lj mixed i
t3 is led to the final settling tank 4. Here, the treated liquid 1
4 and precipitated activated sludge. In the case of the present invention, the bulking problem hardly occurs, so the water area load of the final settling tank 4 is quite large, 1 L. In particular, if the aeration sludge order is to be 5 days or less, is it 4 on? /(m″・[1) water area load is also possible.Principles of anaerobic-aerobic method Complete Ishikawa 1
~ If such a short aeration period is used in the conventional modified activated sludge method, nitrification will always stop at temperatures below 20°C.
, as a result if3. A phenomenon was observed in which the settled sludge in the final settling tank 4 eluted phosphorus.

For this reason, in the modified anaerobic-aerobic activated sludge method (l'L), t
2. Retention of settled sludge in the final settling tank 4; 9 required strict control. However, in the case of the present invention, in which nitrification can always be ensured, phosphorus release can be prevented by the presence of NOx, so the control over the final settling tank can be considerably relaxed.

Most of the activated sludge settled in the final settling tank 4 is sent to the anaerobic tank 1 at the end of the treatment system 111 as returned activated sludge 15 by the return pump 10. In this case, if there is a risk that Noma may remain in the settled sludge pulled out from the final settling tank 4 to the extent that it destroys the anaerobic state of the anaerobic tank 1, a denitrification tank 5 is installed in the middle of the return sludge route. It is desirable to carry out denitrification here. Of course, the denitrification tank 5 contains methanol, acetic acid, or a desorbed liquid from sludge digestion.

Alternatively, denitrification can be promoted by adding a portion of the liquid to be treated 11, but in many cases, the purpose can be achieved simply by stirring for a certain period of time in a state in which not much oxygen is introduced into the solution. The final settling tank 4 has sufficient control of the settled sludge to keep the residual NOx in the settled sludge to less than 9 cents! If possible, the denitrification tank 5 is not necessary. In addition, in the example in FIG. 2, a part of the settled sludge is pulled out as surplus activated sludge 16,
The method for discharging the surplus activated sludge 1 (3) is not limited to this, and it may also be withdrawn as a mixed liquid 16' from the aeration tank 2 by a withdrawal pump 9, as shown by the broken line.

Next, the example in FIG. 3 covers the present invention with 41? '+cyclic 4
This is the case when applied to a modified 1'+ denitrification method. j(OD,
The liquid 11 to be treated with aLr containing reducing nitrogen compounds such as PO2'- and NH'+ is led to an anaerobic tank IK, where it is mixed with active slurry and subjected to anaerobic treatment. The anaerobically treated mixed liquid 12i, i is guided to the denitrification tank 17, where it is fed to the subsequent aeration tank 2.
The circulating mixture containing No. 18 and 11 are combined and subjected to denitrification treatment. This denitrification treatment H (activated pollution remaining in the mixed liquid during the process)
Through the denitrification reaction using the intracellular organic matter formed during the anaerobic treatment process and the B OI3 remaining in the solution as hydrogen donors, the circulating mixed liquid is oxidized. 18f' (contains God) 1. N2+N:
l! It is converted to O etc. and also exists on the solution side■
) At least a portion of 04 is ingested into the whole cell.

Accumulates as endophosphorus. In this way, BOD on the solution side and ■〕04 are reduced, but the denitrified mixed @ liquid 13' in which N1-f, : remains unoxidized is sent to the subsequent aeration tank 2. .

The function of the distraction tank 2 is the same as in the example in Figure 2, but the third
In the illustrated example, a rotating microbial bed is used as the microbial bed 3 installed in the nuisance tank 2. In addition to a rotating disk, a rotating body wrapped in a net or the like can also be used as the rotating microbial bed.

The NIT-:CJ contained in the denitrified mixed liquid 13' is oxidized to NOx mainly by the action of nitrifying bacteria living in the sulfur on the surface of the microbial bed 3. On the other hand, in parallel with this nitrification action, the activated sludge in the mixed solution oxidizes the intracellular substances that could not be oxidized during the denitrification process, conjugates with it, and releases uningested PO4 from the solution into the cells. Ingested 17,
Accumulates as intracellular phosphorus.

The thus generated nitrified and pre-mixed −・
1ff (v; 1g) The circulation pump 8 sends the circulating mixed liquid 18 to the denitrification tank 17 in the previous stage, and the remainder is sent as the settling tank supply mixed liquid 19 to the IiQ final settling tank 4Vl. Although the amount of nitrogen contained in the combined liquid 19 is much smaller than the amount of nitrogen contained in the liquid to be treated IJ, a considerable amount of NO'X-N still remains, and a higher rate of nitrogen removal is possible. If desired, the denitrification tank 17 is added before being led to the final settling tank 4.
C, in which a separate denitrification tank is provided and the denitrification section llT11 is performed, can also be considered as a natural technique, but it is omitted in the example of FIG. The sedimentation tank supply mixed liquid 19 led to the final settling tank 4 is sent to a solid-liquid separation plant, and the remainder is discharged from the system as surplus activated sludge 1G.

The example shown in FIG. 4 is also an embodiment of the present invention applied to a modified circulating nitrification-denitrification method including denitrification. The configuration of the main facility is almost the same as the example shown in Figure 3, but it is characterized by the use of a floating microbial bed 3 made of a chemically synthesized product such as Plus Deck. This microorganism bed 3 is contained in the mixed liquid in the air pollution tank 2.
Nitrifying bacteria on the surface perform nitrification. A screen 6 is provided at the outlet of the sedimentation tank supply mixed liquid 19 flowing out from the baffle tank 2 to the final sedimentation tank 4Vl to prevent the microorganism bed 3 from flowing out to the final sedimentation tank 4. In addition, a screen 7 for collecting and circulating the microorganism bed is provided in the circulation path of the circulating mixed liquid 18, and the circulating mixed liquid 18 is transferred to the de-9ization tank 1'.
The microbial bed 3 contained therein is recovered before being led to the air filter 7 and returned to the inlet end of the turbidity tank 2. In this case, the circulation pump 8 that circulates the circulating mixed liquid 18 is used to avoid crushing the microorganism bed 3 or peeling off the nitrifying bacteria slime on the surface of the food floor. It is preferable to use a pump with a -1 diameter and a lifting culm.

In this embodiment, most of the precipitated activated sludge is separated and precipitated with 91' final sedimentation oil, 4, and sent to the denitrification tank 17 instead of the anaerobic tank 1 as return activated sludge 15. (In 7, a part of the denitrified mixed liquid 13' is circulated into the anaerobic tank 1 from the terminal of the denitrifying tank 17 as the anaerobic tank seeded activated sludge 20.) This type of fluid flow allows the N0 length to remain in the returned activated sludge 15, which makes it easier to prevent phosphorus elution from the settled activated sludge to the treatment liquid 14, and furthermore, the anaerobic tank 1 U1[
- Destroy the state (absence of DO and NOx) and do not do so. 4. The example in Figure 5 is another embodiment of the present invention applied to a modified cyclic nitrification-denitrification process. The feature of this example is that the gastrointestinal tract treatment and the nitrification treatment are performed in separate reaction vessels.
That is, the sedimentation treatment is carried out in the treatment tank 2 for 10 minutes, and there the treatment is carried out in the treatment tank 2. (
- The remaining part is supplied to the nitrification tank 4, and the remaining part is sent to the nitrification tank 22.

In this embodiment, the nitrification tank 22v is a fluidized reaction tank. That is, the nitrification tank 22 internal t・stiffness, jl sand,
, 1! , 2 Light, granular activated carbon or other fluid granular microorganism bed 3 is stored, and nitrifying bacteria are attached to the surface of this granular microorganism bed 3. Air and the nitrification tank supply mixed liquid 21 are supplied from the bottom part and come into contact with the stream 3; At this contact point, the nitrification tank (11, NH contained in the heated mixture 21,
: is oxidized as NO'x' =\. The nitrified mixed liquid thus produced flows out from the tank 17, but the microorganism bed 3 is retained in the tank due to its own carbon content.

The nitrified mixed liquid flowing out is sent to the denitrification tank 17-\ as a circulating mixed liquid 18.

In this embodiment, the nitrification treatment and the nitrification treatment are separated, and the sedimentation tank supply mixture 19 flows out from the culm of the nitrification treatment, so NOx is added thereto. It's less compared to that. If, for this reason, the Vl final settling tank,
If the 7th phosphorus concentration in the treated liquid 14 is increased by elution from the precipitated activated sludge separated in step 4, a part of the nitrified mixed liquid is used as the auxiliary mixed liquid 23 to supply the settling tank to the final settling tank 4. All you have to do is supply it to

The example in FIG. 6 is a modification of the example in FIG. 4, in which the granular microorganism bed 3 is allowed to migrate not only in the air pollution tank 2 but also in the denitrification tank 17. The microbial bed 3, such as zeolite, granular activated carbon or powdered activated carbon, is prepared by adding microorganisms from the sedimentation tank feed mixture 19.
It is recovered by the V-bed recovery device 7'.

As this recovery vessel, a liquid-Reikron or a sedimentation tank with a high flow rate is appropriate. In this example, the circulation of the nitrified mixed liquid 13 to the denitrification tank 17 also serves as the return of the microorganism bed 3. That is, the microorganism bed collector 7'
The microbial bed 3 iJ collected in If BOD uptake by sludge is almost complete, it will not undermine the dominance of nitrifying bacteria in microbial bed settlement, and p /
If wastewater with a relatively high BOD ratio is mixed with Bp liquid [7, the microbial bed 3 shown in the example in Fig. 4] is directly transferred to the air pollution tank 2.
There is nothing inferior in the effect of the branch 4tk that returns to this.

I mentioned above-1. L sea urchin of the present invention is placed in the anaerobic tank or after the anaerobic tank in the flff-old anaerobic method.
1.Installing the nitrifying bacteria in the reaction tank VC/Installing a biological bed 1, and bringing the mixed solution into contact with the microbial bed (1)
-5L-・-4, stable nitrification is maintained even at low water temperatures, and as a result, by selecting an appropriate air pollution sludge ratio, the efficiency of phosphorus removal and sedimentation concentration is improved. Illusion 1? 1.Next, as an example of the present invention, the results of a laboratory experiment will be compared with the conventional method to clarify the effects of the present invention. Make it.

(Comparative Example-1) Synthesis consisting of glucose, meat extract, and inorganic salt - [Using water, a supplementary test was conducted using a modified conventional circulating nitrification and denitrification method.

The flow of the experimental facility is equivalent to Figure 4, Example 1, and the scale of each facility is as follows.

Anaerobic tank 2.20t, aeration tank 500, denitrification tank 6.60/, final sedimentation tank 167, final sedimentation f
111. All facilities except for 13 were installed in a constant temperature water tank (liquid temperature: 13°C σ).

The treated liquid column is 28.51. , / El is the amount of returned sludge, amount of circulating mixed liquid, and amount of activated sludge inoculated in the anaerobic tank, respectively.
The amount of liquid to be treated was 08 times, 25 times, and 1.1 times. Suburban sludge was controlled by drawing out 1.5 t/8 of the mixed liquid from the turbidity tank on about 32 days. As a result, the M of the aeration tank mixture was
LVSS concentration is 5300~/l, SS flowing into the processing solution
The amount of sludge including
/l″The phosphorus content in C1 sludge is 0.0651-P/7-
It was VSS.

-・30 minute SVT value V is 35 to 48 ml'/f/
7) The sludge concentration obtained by standing for 24 hours was 30,500 mq/l.

As shown in Table 1, 0-P was completely removed in the nuisance tank, but 0-P in the treatment solution was removed from the 0-P in the nuisance tank supernatant.
It was slightly taller than the turret. This is thought to be due to the elution of 0-P from the settled sludge in the final settling tank. Other Buba nitrification did not occur at all, and the feral element removal rate remained at 42.

Table 1 Comparative Example-1 The treatment of the experiment was completed (old) because there was no nitrification at all in the experiment of Comparative Example-1. Do/Add one wave of treatment liquid: 1)5
t/+3 and -1 Other flow rates are also low FA. Mixed oil to be drawn from the air tank" 1 is 0.4 z
, / rl and (7, so that the air pollution sludge order is 10.3 tE
3, and the MIIVSSm degree in the anomaly tank was 560 (
l m9//-, including SS flowing into the treated water.
) 1 mud volume is 24OrJP-VSS//: Tona-) f
c.

As shown in Table 2, 1 (so, nitrification, 1 is 1.1 completely?
However, from the point of view of nitrogen removal, the treatment results were satisfactory (
7) However, the phosphorus content e in the sludge was only 0.041 f-P/r-VSS, and therefore the phosphorus removal rate was less than 53 points. The sedimentation properties of frozen activated sludge also gradually worsened, and the 30-minute SVI value reached 22 (1-1).
It became 270ml/y. At this time, the concentration of concentrated sludge left standing for 24 hours was 2]500 to 1/l.

Comparative example 1 operated under the sludge ordinance as shown in 1-1 below.
Although a high phosphorus removal rate and excellent sludge sedimentation and concentration properties were obtained in the experiment, nitrification did not occur at all, and nitrogen removal was only incomplete. On the other hand, when the length of time was increased to the extent that nitrification could occur, both the marin removal rate (VC) and the sedimentation and concentration properties of the sludge deteriorated.

Table 2 Comparative Example - Treated products of 2 experiments (Example) After obtaining the knowledge regarding the conventional modified cyclic nitrification and denitrification method as described above, the experiment of the present invention was carried out using 7t, 1, and microbial bed. 1-/C is PVC 1゛-,,--- with inner diameter 12+yyy+
-y with 7tc- spring, and put this in the turbulence tank.
, - All the liquid phases, such as the Ichigami processing liquid fl, which was installed so that the flow inside the tube would not stop, were the same as those in Comparative Example-1.
After the change in operation, nitrification stopped immediately, but gradually recovered after 3 weeks. 7. After 4 weeks, the same treatment results as Comparative Example 1 were obtained. 1, subsequent treatments All grade point averages are shown in Table 3. , at this time the sludge order was 3
In 3 days, the MLVSS concentration of the air pollution tank mixture was 5050~/
It was l. Sludge including SS flowing into the treatment liquid h1
Table 3 Example: The treatment result of the experiment was 285 m9-VSS/l, and the phosphorus content was 0.
069y-PI3-VSS. There is almost no phosphorus released in the final sedimentation tank, so the phosphorus removal rate is comparative.
It was slightly higher than in case 1.

The improvement in sludge sedimentation and concentration is faster than the nitrification rate.
Three weeks after the change in operation, the SVI value was 50 m (below 1), and finally stabilized at 37 to 45 m1/l.
In addition, the 24-hour static @ thickened sludge concentration at this time was 32,000.
In order to investigate the enrichment factor of the microbial bed for nitrification, the microbial bed was gently removed at the end of the experiment and the deterioration of nitrification was observed. On the next day, 22~/'L of NH3-N remained in the treated water, and from this it was estimated that at least 78 L of nitrifying bacteria was attached to the microorganism bed.

The above results are summarized as shown in Table 4. From now on, we will proceed to the present invention. (1) The nitrification reaction proceeds smoothly, (2) The phosphorus content in the activated sludge is high. , (3) the activated sludge has good settling properties, (4) there is almost no phosphorus elution from the settled sludge into the treated water, and (5) the removal rate of BOD, 1'N, 0-P is 1. ), and many advantages such as i) Ira hru (ii).

4th garment

[Brief explanation of the drawing]

FIG. 1 is a t-graph showing the results of basic experiments of the present invention, and FIGS. 2 to 6 are sheet C showing different embodiments of the present invention. 1- Anaerobic tank, 2... Anaerobic tank, 3 - i Yugyumonodoko, 4
・・Final sedimentation tank 1.5, 17・・Denitrification tank, 6, 7 Screen, 7′・Microbial bed collector, 8・Circulation pump, 9・Extraction, pump,】〇−Return pump,】1・-Liquid to be treated, 12・Anaerobic part 1M) Situation ls, M, 13・Ki 1 A 1 Portion treated mixture i'? L 13'... Denitrification treated mixed liquid, ] 4... Place (Liquid 11, 15. Returned activated sludge,
16. Surplus activated sludge, 16'-. Mixed liquid, 18, 1
8'--Circulating mixed liquid, ]9-U, 'Oil supply mixed liquid, 2
〇-Anaerobic tank seeding activated sludge, 21...Nitrification tank supply mixed liquid,
22-4 t'i conversion tank, 23... Sedimentation tank supply i''lIi auxiliary mixed liquid.
``Taku ten mother-in-law mountain J mo - times patent attorney 1000
l-+E Twist 0 (Sun) ---

Claims (1)

[Claims] 1. Do activated sludge and liquid to be treated substantially exist in both DO and NO? In a method in which the anaerobic treatment solution is subjected to explosive treatment by mixing and stirring under conditions of When the liquid comes into contact with the nitrifying bacteria, it is brought into contact with the material floor.
A treatment fly for organic waste liquid characterized by carrying out 1.
, 2. The anaerobic treatment liquid is subjected to the nitrification treatment. The treatment method according to claim 1, wherein the denitrification treatment is carried out by mixing L7 with the nitrification treatment solution obtained by the method, and the resulting denitrification treatment solution is treated by the aeration treatment T culm. MLVSS of the mixed liquid in the two aerated culms and M I , V generated in the -jlj treated culm.
Ratio to S S 1j'+ (Ki 1'fA fj mudrei)
Cuff F3 or below, good! tL < k: L 5 tL or less F
Claim 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 2, 3, 3, 3, 3, 3, 3, 3, 4, 3, 3, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 or 3 2.