JPS5946192A - Suppression of filiform bacteria growth in activated sludge - Google Patents

Abstract

PURPOSE:To selectively suppress the development of filiform bacteria in activated sludge, by charging the amount of chlorine corresponding to 5-60ppm of the amount of inflow filthy water at an arbitrary position of the aeration tank of a microbic oxidizing apparatus having said aeration tank. CONSTITUTION:By the apparatus comprising a tank 16 for sodium hypochlorite, a tank 17 for hydrochloric acid and a measuring tank 18 for supplying the fixed amount of each of them, a mixed liquid (a 12% sodium hypochlorite solution and an 18% hydrochloric acid solution are usually used) is charged through a passageway 19 in the vicinity 5 of the filthy water inflow part of an aeration tank 4. After solid matter is removed in a primary precipitation pool 2, inflow filthy water is charged by fixed quantities in the aeration tank 4. The aeration tank 4 is filled with MLSS in the concentration of 1,000-10,000ppm. Treated water is separated from sludge in a precipitation pool 8. The former is drained outside the apparatus, while the latter is partially returned as returned sludge through a passageway 12 to the aeration tank 4.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for preventing and curing bulking by suppressing filamentous microorganisms in activated lf5 mud. It is something.

As a method for oxidizing organic matter (water), the mud method, the aerated raccoon method, or a hybrid method thereof are commonly used. These turtle people are very easy to remove H (111)
On the other hand, Tomozune.

The volume of sludge increases (swells), resulting in so-called bulking (
■In order to cause ulking)
111 Water content #:l may not be carried out sufficiently or may become ineffective. This bulking is caused by the proliferation of filamentous microorganisms in activated sludge.
This often occurs when wastewater containing all kinds of organic matter is treated using the above method, but especially in the processing of soybeans such as tofu, miso, and soybeans, and in the processing of milk. The reality is that almost all water treatment methods cause bulking, and there is no effective way to improve this problem. In order to carry out the above treatment method in such a bulking state, the only way is to expand the volume of the aeration tank, and even if the aeration tank is expanded, there is no guarantee that the bulking will be improved. Instead, they were having a hard time figuring out how to deal with it.

The present inventor discovered that Sphelotilnus (a cause of bulking)
5phacro (illus), begia toa (Bcgg)
As a result of research into methods for selectively suppressing the growth of filamentous microorganisms such as A. Heading This invention has been completed.

That is, the present invention uses a microbial acid (specific treatment device) having an aeration tank, in which 5 to 60 pp of water is added to an inflow of 7 r5 h
TI) for chlorine equivalent to 1F in an aeration tank.
This product was developed with the aim of selectively suppressing the growth of filamentous (i23) organisms in activated sludge, preventing bulking of Yj ■ 1↑ 11/lj mud, and modifying and curing the bulking of Yj ■ 1↑ 11/lj mud. It is.

The aeration tank referred to in this invention is tl;1 type sludge system, 11
71) Regardless of the base air lagoon method or other methods.
Mixing water and sludge (Sluclgc)
clarion) to decompose YnlR materials, and the apparatus in which the method of this invention is used is a sink for separating mud and treated water, IB5 cya, return tlj mud circuit tongue. It does not matter whether or not there is an IFI, or the difference in aeration methods such as the surface [I\\air force type and the deep layer 1 aeration force type.

Activity related to this invention ↑11t71j Microbial suppression power in mud υ
(IJL) Food, paper manufacturing, alcohol 3: '+
': It is sufficiently effective even when used to drain water from the tongue.

In this invention, the chlorine h1 introduced into the 113 J air tank is in the range of 5 to 60 p+111 for the inflow '/'' J water l, and the required chlorine) i;
, 1+01 of inflow lf5 water) (biochemical oxygen demand, I
+1ncl+c C; II (]XggC11) cIna
nd) Qi, MLSS of aeration tank (5uspcnc
lcd 5oliclsIn Tl+c Mixccl
Liquor) is determined as follows according to the usage etc.

(]) rJ (month) is 5001) T) Ill, aeration 4
hi cr) MLS S is 35001) pan (
This condition is called the standard σt1a degree. ), the required amount of chlorine is in the range of 5 to 20 ppm.

That is, depending on the degree of bulking, the above range 11J''1
Increase the input chlorine by 1m by 11. If it is simply to prevent bulking, 5 to 1 ppm is sufficient, but to improve bulking, it is necessary to further increase the amount. If the concentration is excluded, the limit of the required amount of chlorine is determined approximately according to the following equation.

C: Upper limit of input chlorine 11 [, pp+n], C-
, fi OX: inflow/fl water (7) I((,)l)
['p pan], X-,: U000Y
: MLSS [pp+n],
'l' -1・1 0,00
0 In this case, as in (1), depending on the bulking state of '/fjNIL! 75 - Determine jl, ma, 1'i' + thrown chlorine), : in the range of January 1 of 60-C.

The chlorine used in this invention is not a body chlorine gas scale, but a substance containing effective chlorine, such as sodium chlorate, sarang, advanced saran, etc. In this case, using a mixed solution of sodium chlorate and hydrochloric acid instead of chlorine gas has the advantage of providing good results in terms of effectiveness, ease of use, and cost. Understood.

Moreover, it is best when the mixing ratio of chloric acid and hydrochloric acid is 1 to 3 to 1 as a blunt TI. The reason why replacing chlorine scum with a mixed solution of chloric acid and hydrochloric acid gives the best results is not necessarily clear, but if only chlorine gas is introduced, The gas will be consumed immediately, and the gas will be scattered in the air, and the next i1
1 + Chloric Acid Natriuno, (same as sarang, quotient 1 rizarashi powder) alone, a) Effect J (, 1 element < 1!
, 18 degrees is considered to be 1゛1-too much. ,
Therefore, if the ratio of chloric acid and hydrochloric acid is given by
11(, ”, 1! →(”, 4: 1-N a Cl
i 11120, the following I++: chloric acid and chlorine are
11. The best yarn for r. This meant that the Song dynasty was also not included.

Next, microbial oxidation treatment equipment 1 that implements wood 411 light! Skin fat (drawing a bribe) 1 (I will explain it next.

Figure 1 shows an example of the story ↑/1/ri9 method)
! 'I.

This is a schematic diagram (inside view), and in the diagram, 1 is 1Ill person)
In the water flow path, 2 is the first settling basin. This I (the first sedimentation IN) is collected in l mountain 2, and 1 J l is removed by flow path 3.
A certain amount of water (i, l, -4) is poured into the aeration tank 4. This 113.4 Qi J: Hlji 4 is divided into 4 rooms as a whole, and the inflow 〆rj water input 11 from the nearby 5 as shown by the arrow /lj water is fli! + ring 11) After the ring air is removed, the lr final sediment is overflowed with a small stream of 117.
- and then flows into the final sedimentation tank 8. 1 In the aeration tank 4 (dMl, 8s is J, OOO-] (1, (
10U l1pln 117)'l'J-a Te11,
'11. J Bukosano 1 is here. Then, in the sedimentation tank 8, the treated water and sludge Q; Aeration i; “'7io is stored;; leopard white 1
j After self-digestion, 115. Qi J: +il
,・4・＼” Hayashi is sent to JJ as 1rjl himself. In addition, some of the l'r mud in route i, -; and remove it from the device.

In addition, Figure 2 is a schematic diagram (inside view) of +1!! showing an example of an aerated lagoonka type solo., - j↓, 1
If &;i: /+ii, by path 3 jA7. personllj
Water or 1 aeration),, put into Hjlj4, constant 111
Jl! , l After applying 112, 11'), j Stop taking care - 51 hours and let it stand for 7t # and treated water, min ν) 1
After 1.1 liters of water have passed, the gate 15 is opened and the 1.1 clear water is poured out of the apparatus.

Next, the next II+! used to implement the present invention! 16 is a tank for sodium chlorate, 17 is a tank of hydrochloric acid, and 18 is a constant F1 (ij sombe) for supplying each constant: 1:
)1.
Missing song salt go? , acid b[·li-1-), 12% solution and hydrochloric acid 1
8% solution is used, 2) is the flow path 19kt-, J
:S11) l air i'j"j 4 '/) 7") Water inflow l 11・l' h 5 K input) l Z+, 1
．． Una・）C is here.

At this t: 1, add chlorine t: 1: + +
St ii: II), ・) /, C), fly in 211H4, (:・) is fine, but the song 'Hata &:lt
+i7, person lI, add water j] i, i, IJ5, pour in water. Inflow ff, water input 11 I・I', Ji S &:
I:re1)k11'White increases to the most people i and j111'l'L'r 1. Q:/, :c, so J'fll'l-
,'! '; Insert i, lever f, I +i to make thread-like
Of things! This suppresses η'1 by 11'1. .

ShikaI, soil 1r:, the highest 1% E'Q +l+lQ is mountain-a-rI't Luker 戊<? 1 layer At+; mud force type, l'l'l'I'l '/'r mud'f -y I
f)-', F21S')No11. ', , /〒k(
2 &, l, 1 tbsp for adding chlorine, final sedimentation I1. Q oil inflow 11 a, t, li 6 - forces may be good in some cases.

Here ＼ When chlorine is added, II) 4 contents in tank 4!
1 white powder, 1r of chlorine and 1r without much aeration (
T Shero lll + 8-\Y9 people do - C1 Chlorine fly 1
Since there is almost no 1t and the 1 & corner east of ρ and salt, +, ; are divided into 1 and γ, there are very many cases where bulking is severe (thready / l14).
＋'i l JJ, 1 go) may be effective. Same (1・111jll+, return chlorine l'; There is also a case of IJ, j where ll'l is attached to the person. In this case, ←
t ny′<(Since chlorine is immersed in cell 1111,
Without settling tank 8 or Ir, 1. /U: # iya8
Ka':) IB, 4 Air tank 4 ・＼, 4 Connect) L Tail+! A, j)"2' Jt1 Kiyama 11) C Kishi 1
．． 110 soil/cI (1,'' material transport 11 + %lii
, 1. ', because I'm going to put it in Pa 1 Zo 11, llj mud and salt,) 2's connection) Illll! Gari'ni l S)ni'i J
i: It has the effect of being helpful. 1 actual h [1j example 1 active t
/Ilsul) For processing of 1 force type; Example (1) using 1□°1
Equipment 11! Abbreviation ll1l, ti air tank volume: 1i', 8 (1(l nj
' is 20 (I'm, 1' -, ill' is in the first tank A, etc. l<, +l1Ii is connected] 1, the content of the 1st tank: 11, 1 fl m “11 +1i,, Kitsuno style (11, Water 1 country, <Ki) 1 style,.

(2) 7I! c Hitoshijireno 1 (milk 'i'-1
11 Mizu and 1,) 11. Mayu 11 Mizunoichi, r'7-C approx. 1
Ll fl Ll +,,,”+l+y, If)
I));l,ip'J! 'i 0 (+ ++1
On.

(:Ll lr; li's 1 / child MLss's borrowing is 2 D tl tl ■) 111, Ken<;7':,, then filamentous fungi (1,!:L with Begino'Tono' and River, The convexity of u+:ll/', ) is drawn in the shape of IL of -;! &r L,,Platinum" I -> When I put it, I pull the thread I I 1
, pump into the female cylinder of 1e and between Hll1l:'+
'r1 place °C also all <l':FIJ'SVtsuo-L
l, SVI 61, jlii 'LI-unable (u
l/1. /, +impossibility) de-)/[0 (4) J4+i elementary immersion and conclusion 1]! Using 12% sodium hypochlorite and 18% hydrochloric acid at a mixing ratio of 3=·l, a mixed solution of sodium hypochlorite and hydrochloric acid was initially applied to the inflowing sewage using the liquid-forming device r1°. 15 pprn of chlorine was added to the vicinity of the influent sewage 1], and the amount of added salt was reduced as the number of filamentous bacteria decreased.Chlorine was added continuously for 24 hours. When microscopically examined over time, the length of filamentous bacteria became shorter from around the 10th day, and the amount of filamentous fungi decreased noticeably from around the 20th day.In the first month, the sludge was mainly composed of Zoogloea. None, the number of fixed f'1ν j vehicle stops increased. Part 1 (Chlorine f'll was added to "A")
There is no growth of filamentous fungi, no, ss
Even if the amount increases, it is still extremely sedimentary. ill+t'
I no longer have to worry about l1M's glee overflow.

Example 2 An example using an aeration-type treatment device (1) Approximate outline of the device 1 The capacity of the aeration tank 11) is 21) 00 m, and only one tank is used.
Surface aeration method. 115I ki++! J time is 18 hours 7' city 1y.

(2) Inflow of sewage for 1 person (-1,j rot) 1 no 1 water is approximately 8001/
City y, +1 (month) is approximately 1. (100ppm.

(:3+ iri mud situation Mr, 5sal is 6000 ppm, microscopic examination shows that filamentous fungi are densely planted, 5V50 == 1 (1 (1, SVI j'
J, '1il')': L'i'no de-)'.

(4) Injecting chlorine into the inflow water using the same method as in Example 1 was started from 25 pl) m.

Changes in sludge over time are as follows.

Testing over time・The results were noticeable from around the 40th day.
Even though the MLS8 increased, the sedimentation properties became very good, and no bulking occurred even after reducing the chlorine content.

As mentioned above, according to the activated sludge filamentous bacteria suppressing power method according to the present invention, by simply adding chlorine to the aeration tank white,
Not only can bulking be improved, but bulking can be completely prevented simply by successively adding chlorine from the river; However, chlorine may cause other pollution1, and since chlorine has oxidation properties,1 aeration,
The self-extinguishment of the mud can be completed quickly, and the labor and cost of the mud can be reduced by f'ii'.
+ρ111. The effect that can be achieved is 1.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the /J<zu example of the li': 7'r mud method, and EB82 is a schematic diagram of the example of It is a small schematic diagram. 1... jA of inflow lfj water:, i1'8.2... Maximum i percent conversion 7..j + h ton, 3... flow, path, 4... aeration Tank, 5...Inflow water input 11, 6...iI
a end sinking Ill jlJL /, ii, person l 1i・]
J! i,7 ”'h'J,i%:,,,CSQ t
1! t i'ljl, peoplell.

Claims (1)

[Claims] 1.1 Microbial acids in the aeration tank (in specific treatment equipment,
A method for inhibiting filamentous microorganisms in activated tυ mud, characterized by introducing an amount of chlorine equivalent to 5 to 60 ppm based on the amount of inflowing sewage into one point in one aeration unit. 11. The method for inhibiting filamentous microorganisms in activated sludge according to claim 1, wherein the aeration tank is of an activated sludge type. 1. The method for inhibiting filamentous microorganisms in activated sludge according to claim 1, wherein the aeration tank is of an aeration lagoon (aeration oxidation pond) type. 1. Claim 1 characterized in that the place where chlorine is introduced is near the inflow sewage input 1-1; A method for suppressing filamentous microorganisms in X-measured sludge. (2) A method for inhibiting filamentous microorganisms in activated sludge according to claim 1, in which the chlorine to be added is a gas; 1111 method for controlling filamentous microorganisms in activated sludge as described in Section 1 of IIJ Permit 31'l. 49. The inhibitory power of filamentous microorganisms in activated sludge according to claim 1, wherein the ratio of sodium hypochlorite and hydrochloric acid is 1 to 37 J as pure substances.