JPS58202097A - Treatment of ammonia liquor with activated sludge - Google Patents

Abstract

PURPOSE:To recover the malfunctioning of treatment in a very short time, by adding rice bran to an aeration tank for the activated sludge process and recovering oxidation-reduction potential to a specified extent with the increase of an aerating amount in case of said malfunctioning of treatment. CONSTITUTION:On the occasion of the bad condition of treatment in an activated sludge process for treating ammonia liquor formed in the preparation of coke by the carbonization of coal, rice bran is spread to an aeration tank for the activated sludge process. The spreading amount is made different in response to the degree of said bad condition of treatment. In a slight case, rice bran is spread at a ratio of about 10-30g/day by 1m<3> of the aeration tank for about 5 days. In a serious case, it is spread at a ratio of 0.5-1kg/day for about 3-10 days. By this spreading, bubbles in the aeration tank are immediately eliminated, and oxidation-reduction potential (ORP) is concurrently reduced. An aerating amount is increased with said reduction to recover the ORP value within at least 50mV below a proper value. Thus, the decomposition of the rice bran can be smoothly performed, and the recovery of the malfunctioning of treatment can be accelerated.

Description

[Detailed description of the invention] The present invention relates to a rapid lgl treatment method.

Mesui produces about 10 to 15N of coal, which is produced during the dry trade of stone and coke production. Anhydrous water is phenol. Cresol, xylenol, etc., and ammonia compounds, cylindrical compounds, didane compounds, and thiovalent compounds. #Contains unscrupulous compounds such as chloride, CO
D is also 5,000~10,000 1)I)m
and high <, '! *. *It exhibits a brown color and cannot be discharged into public water bodies due to its unrefined state.

This ammonium water treatment is carried out by distillation method etc.
The method of Tsutomi is to practice the principles.

Activated sludge treatment of ammonium water uses phenolic compounds.

Although it is an inexpensive process that decomposes and removes most of the OOD components such as rhodan compounds, it is necessary for activated sludge treatment equipment for municipal sewage, ym. m-line conditions etc. t. I'm just imitating it. However, cheap water is compositionally more complex than municipal sewage, etc.

Cyanide. Because it contains components such as pollutants that combine with the +IA rudder of activated sludge. There are limits to the equipment specifications, management, and operating technology for oily sludge such as S City sewage, but there are limits to its application to oily sludge.

For this reason, compared to the conventional ammonium water activated sludge treatment 1, unexplained treatment failure thresholds are likely to occur, and if treatment failure occurs.
Because the causes, countermeasures, and injury techniques have not been clarified, recovery methods are based on trial and error, and recovery takes 1 to 6 days.
Sometimes people praise the long period of the moon.

Furthermore, one important problem when treatment failure occurs is that in many cases of treatment failure, the decomposability of the rhodan compound decreases and the quality of the treated water becomes sensitive. The iron aggregation t' number θ1 of the rhodan compound 1 in this treated water. It is difficult to remove it even with physical and chemical treatments such as activated sludge treatment, and at present, methods other than activated sludge treatment have not been established to remove it economically and efficiently. In such cases, after activated sludge treatment, iron coagulation precipitation method, activated plate l
Even if a withdrawal processing system such as the IX Bird Method is installed, the rodan compound cannot be removed by passing through the processing equipment.

Bacteria that decomposes this Rodan compound jar (Rodan assimilating bacteria) fJ,
,) Compared to a plane that decomposes enol etc., N-fertilization is slow and slow, and according to the inventor Kenkyu, it is toxic.

If the function of the drug is reduced due to drugs such as P II, these V drugs should be removed.

It has been revealed that it will take up to 60 days. During this period, the Cl0D and rhodan concentrations in the treated water will remain high.

Another important issue is OOD generated from steelworks.
Out of the amount, OOD caused by ammonium water accounts for the highest proportion of approximately 50 to 70%9.If malfunctions occur in the activated sludge treatment of ammonium water and the treatment malfunction continues for a long time, environmental discharge regulations cannot be complied with. There are concerns that it will disappear.

Although the inventors have already established a treatment technology suitable for IIJI burial of ammonium water, they have not always been able to adequately cope with the treatment rate al11. Therefore, in order to improve the conventional method, the present company has completed a technology that allows the activated sludge treatment using ammonium water to recover in a significantly shorter period of time than the conventional method when it becomes malfunctioning.

Shock caused by components that inhibit the function of activated sludge in ammonium water,
The malfunction of activated sludge treatment due to the shock caused by the abnormal pH is due to the fact that the 2 Kutilya (Assimilation III) constituting the activated sludge is killed by these shocks.

In order for the processing disorder to return to the normal processing state, the bacteria that have been reduced by 9 levels due to the shock must first be allowed to proliferate and the normal processing to be carried out to restore the state to the normal state.

Method Company, which restores poorly processed activated sludge to normal condition.
Improve the pH of activated sludge treatment by removing the cause of treatment failure.
The most common method is to control temperature, DO, etc. under appropriate conditions.

However, activated sludge is a collection of various bacteria, and it is thought that the properties of each bacteria are quite different. For example, as explained above, the growth rate mu of Rodan assimilating bacteria is very slow, for example, about 1/4 of that of Tumakuchiria, which decomposes phenolic compounds. Therefore, it is necessary to accelerate the growth rate of bacteria that have a slow growth rate, such as Rodan Assimilation IIO, in order to quickly restore the malfunction of activated sludge treatment using ammonium chloride.

In the conventional waste recovery method, the activated sludge treatment conditions are 1. Control DO etc. and bacterium pH.

However, in this method, in order to recover from the processing failure, as explained earlier, the growth of KA bacteria, especially Rodan assimilation, is promoted and the treatment failure is short-term. We conducted research on ways to recover.

in general,/? Bacterial traces of pitaquin, metal salts.

It is known that the presence of enzymes and the like promotes moderate growth.The inventors focused on this point.

As a result of adding vitamins, gold salt, enzymes, etc. to the aeration tank of T-ammonium water activated sludge treatment, the growth rate of bacteria was determined.
If we take Rodan assimilating bacteria as an example, it is an additive-free environment.

It was found that the proliferation rate was promoted by about 2 to 5 times compared to that in the case where From these results, it is considered that when @-type sludge treatment O malfunction occurs, the malfunction can be recovered in a short period of time by adding vitamins, element 11, metal salts, etc.

Then, a malfunction actually occurred, and as a result of the addition of JLK to the activated sludge treatment, Tsumugi was able to recover from the poor decomposition of the rhodan compound.

The conventional method took 20 to 60 days, but by adding vitamine, gold salt, yeast, etc., the disease recovered in 7 to 10 days.

However, if this method is applied to processing problems in actual equipment, it will cause a huge amount of trouble.
It requires a bitine, #cumulative, etc., and its cost is long, making it difficult to put it into practical use. Therefore, the inventors investigated alternatives to pimemin, rice flour, etc., which are suitable for women and can be obtained in large quantities, and found that they are optimal for use in rice feeding and rice bran.

As shown in Table 1, rice bran contains many types of pita nuts, minerals, nutritional bulk, etc.'1. In addition to the components listed in Table 1-1, oleic acid and linole H are also included.

Noel Aten III! Glycerin ester of nato0J11 fatty acid.

Contains squalene, sterine, etc. These #i Table 10 ingredients and Jiig-like have the effect of promoting bacterial growth.

Table-! Example of rice bran component (100 f) The method of using this rice bran to recover from defects in aqueous activated sludge treatment is extremely simple. In other words, it is good to spray rice bran once in the aeration tank of activated sludge treatment. , -ki m1m/to 9 US X force tlEI
K10~30ft for about 5 days 8, and if the processing is uneven, 500~1,0 per day (10fmlt3 days~8)
Spraying is good for about 10 days.

The bubbles in the aeration tank disappear immediately due to rice spraying, and at the same time, the ORP decreases.

The degree of decrease in ORF varies depending on the amount of rice bran added, but it decreases by about 1'o to 200 mV. This 01L
The decrease in P suggests that the activated sludge is decomposing rice bran. However, in order to further promote the decomposition of rice bran by activated sludge and to quickly recover from processing failures, it is necessary to suppress the large decrease in ORP. A good way to do this is to restore the 0RPt to the appropriate value by increasing the amount of aeration. However, if a large amount of rice bran is added, it may be difficult to restore the 0RPt to the appropriate value. Therefore, if the amount of aeration is increased (by increasing the amount of aeration), the decomposition of rice bran will be reduced in most cases if it is restored to at least 450 mV below the appropriate value. Proceed to.

It was found that it can promote recovery from processing disorders.

Next, a method for recovering activated sludge by adding rice bran will be explained using an example.

Using two experimental activated sludge treatment equipment of the same scale and treatment conditions, activated sludge treatment of ammonium water was carried out under the conditions shown in Table 2. In order to cause i1M to occur, the aeration tank OpH was lowered from 7.0 to 4.5, and this state was maintained for 12 hours. As a result of this pHV, the oxygen consumption rate of the activated sludge decreased by approximately 90 to 95x4 compared to normal conditions, the COD increased rapidly as shown in Figure 1, and the rhodan compound increased as shown in Figure 2. teeth.

It almost stopped disassembling and became completely unwell.

In the figure, 300 tons of rice bran per day was added for 3 days from the 12th to the 14th.
I17J Minpu t,, 罎iqso's onp +150~20
0JJ] The progress when the control tube was buried at 7.0±12 for VK and RIH is shown. On the other hand, in Figure 1 B, the pH of the aeration tank was set to 7.0±0.2 without spraying rice bran. ORP'1200 Sat 1
In addition, in activated sludge treatment, if rice bran is destroyed, the ORP of the aeration tank will be +50 to - from the set value (+200 mV). 50
It drops to 111Y, but with aeration kcD Masakura 30R
Control and management were performed within the range of Pf: +tso to 200 uiv.

As a result, as shown in Figures 1 and 2, it was found that the period required for 00D and #IIf of the rhodan compound to recover before the pH shock in the treated water of the pH-treated Sootsukuki area was longer than the period required for the rice bran to be sprayed. While the case recovered after about 7 days after spraying, it took about 35 days for Yanghe, who did not spray rice bran.

It has become clear from Nire et al. that spraying rice bran on an activated sludge treatment tank with malfunctioning treatment and maintaining an appropriate 01'LP value is extremely effective in recovering from poor treatment.

In addition, other young fruits sprayed with rice bran are shown in Figures 3 and 4.
- Mirror quality of activated sludge in the air tank (ML88).

It shows properties such as sedimentation (SV,..., 8V1), but when rice bran is sprayed (Kyochunin), it is about 5.00011
1m>111(2) MLS8 becomes about 10.0m after about 7 days. O
OOPpj1mK increased to 8V, a measure of sedimentation.
1 had a pH of about 110 at the time of oxidation, but
After spraying rice bran, it decreased to about 55 at about 108 days, and the sedimentation property of activated sludge improved significantly.

On the other hand, if rice bran is not sprayed (B in the figure), even if the unreasonableness caused by %pm shock is recovered, ML88 increases and +3V
No effects such as a decrease in 1 are observed.

In this way, it has been found that in addition to shortening the recovery period for rice bran spraying and treatment failures, it is also significantly effective in improving activated sludge O proliferation and settling properties.

In addition, as a TGLN method for treatment failure, water-resistant liquid t-activated sludge of ferric chloride is used in addition to rice bran spraying in the air tank! & How to add ferric chloride, which can be added to the weir.

- It may be applied directly to the air tank, or ferric chloride may be added to the raw water to be supplied to the air tank for activated sludge treatment.Further, as a method for adding ferric chloride, It can be added to the center fel of the sludge settling tank of activated sludge treatment equipment.This method improves the settling properties of activated sludge in the sludge settling tank, and also aerates iron salts along with the activated sludge returned to the air tank. Since it is returned to the tank, the iron salt has the effect of promoting bacterial smoke-enhancing action.

In addition, by adding ferric chloride, the PM of the m-air tank can be adjusted to the appropriate value (
If the pH is lower than 7.0 ± 0.5), use an alkaline agent such as calcium hydroxide in an aeration tank, supply lll1 raw water,
Good for adjusting GIH by adding it to the center fel of activated sludge settling tank.

As explained above, the present invention uses a simple method for temporarily adding rice bran to the activated sludge tank in the activated sludge treatment of ammonium chloride water and maintaining the KORP value appropriately. I can do it later.

[Brief explanation of the drawing]

Figure 1 shows the OOD of activated sludge treated water, and Figure 2 shows the OOD of activated sludge treated water.
This shows the changes over time in the Sedan compound. A is when rice bran is sprayed, and B is when rice bran is not sprayed. Figure 3 shows activated sludge in m-air tank 411.44 shows 8V
1 are shown respectively. Agent: Patent attorney Masamitsu Akizawa and 2 others”<t +tn
June 22, 1980 Director General of the Japan Patent Office 1 = 4' - Indication of Patent Application No. 79132 3, Person making the amendment' 4 Relationship with the note Applicant Address (Residence) Tokyo 2-6-3 Otemachi, Chiyoda-ku Name (665) Nippon Steel Corporation 4.
Address: 5 Taiyo Building, 12-1, Nihonkukabu-cho, Chuo-ku, Tokyo
, Mli), @ 6 Date: Showa Year, Month, Day (Shipping) 11 - Zetsubuyamadori in The statement of contents of the amendment is amended as follows. (1) Delete "for example" on page 5, line 13. (2) On page 6, line 15, ``I discovered that.'' is corrected to ``It became clear that.'' (3) In Table 1 on page 8, replace “Inorganic (2)” with
Correct it to "inorganic (rnν)". (4) Page 13, Table 2, 3rd line from the bottom, r (svtl
lo) Delete J. t17 I'll September 1980 Z, Commissioner of the Japan Patent Office, 1 "IY I'" (Representation of Patent Application No. 79132, Ammonium Water Activated Sludge Treatment Method 3, Relationship with 14 Amendments by Persons Making Amendments) Address: 2-6-3 Otemachi, Chiyoda-ku, Tokyo Name (665) Nippon Steel Corporation 4, Agent Address: Honkatocho, Chuo-ku, Tokyo No. 12 No. 1 Taiyo Building Sode 11 - Order 5, Date of □ August 31, 1982 (shipped) 6, Number of inventions increased by amendment None.
Content 1, lines 2 to 7 on page 14 of the specification are corrected as follows. This is a diagram. 2. Figures 1 to 4 of the drawings are corrected as shown in the attached sheet.

Claims (1)

[Claims] (1) Treatment rate wI4W in ammonium O activated sludge treatment
In addition to adding rice bran to the aeration process for activated sludge treatment, the addition of rice bran caused a drop in the potential (oa).
In response to p), increase sales of %-Kiou 50RP
A method for treating activated sludge with ammonium sludge, characterized in that the treatment is carried out by returning the ammonium sludge once to within 450 μm IIV, which is at least below the appropriate value.