JPS5827682A - Treatment of filthy water using active carbon - Google Patents

Abstract

PURPOSE:To efficiently purify water, while making good use of active carbon to absorb COD, by adding the active carbon to water treated in an active sludge process, agitating the treated water while being aerated for a fixed time, coagulation-sedimenting the agitated water, and then discharging the resulting purified water. CONSTITUTION:Raw water of 500ppm BOD and 500ppm COD is introduced into a sedimentation vessel 1, where it is aerated and agitated to perform microbic treatment with active sludge. The purified water of 5ppm BOD and 60ppm COD is introduced into a reaction vessel 2. On the other hand, active carbon which was used during sugar manufacturing is supplied into a cultivation vessel 3, and microbes are cultivated with active sludge under aeration. The regenerated active carbon together with the purified water is introduced into the reaction vessel 2 as shown in the arrow 9. After they are reacted by aeration and agitation, the water is discharged through a coagulating sedimentation vessel 4 as shwon in the arrow 10. This discharged water comes into a state of up to 1ppm BOD and up to 10ppm COD.

Description

Detailed Description of the Invention This invention uses activated carbon in a suspended state, activates the activated carbon by microbially treating the BOD adsorbed on the activated carbon through aeration, and adsorbs the COD contained in the treated water. The present invention relates to a wastewater treatment method using activated carbon, which aims to improve the treatment status of wastewater by effectively using activated carbon.

Conventionally, activated carbon is used to further purify treated water that has been treated with activated sludge, but the purchase cost of activated carbon increases the cost of purification, and there is a desire to reduce the cost.

However, the BOD value in treated water by activated sludge treatment is relatively low (for example, 5 ppm or less), but the COD value is b
Since the amount is around oppm, repurification is performed to bring it below the discharge limit value (
For example, COD/θppm or less) was required. Therefore, by reducing the COD value of treated water from activated sludge treatment, the amount of residual filth can be purified to below the target value.

Since a large amount of organic matter is adsorbed on the activated carbon used in the conventional method, it is thought that if the organic matter is treated with microorganisms, the spent activated carbon can be activated and used effectively.

Therefore, this invention introduces used activated carbon into a microbial culture tank, treats the BOD adsorbed on the activated carbon, activates the adsorption power of the activated carbon, and then mixes it with treated water after microbial treatment, or adds new activated carbon to the activated carbon. If used in a suspended state and the absorbed NBOD is treated with microorganisms, the purpose of adsorption and purification of COD in the treated water can be easily achieved, and by reusing used activated carbon or greatly increasing the service life of new activated carbon. They succeeded in significantly reducing processing costs.

That is, to explain this invention with reference to FIG. 1, treated water obtained by treating raw water with activated sludge is introduced into a reaction tank, and an appropriate amount of recycled activated carbon, which has been activated by microbial treatment such as spent activated carbon, is introduced into the reaction tank. If you introduce it and leave it there for a certain period of time under aeration,
COD in the treated water is adsorbed to the activated part of the regenerated activated carbon, and BOD is also treated with microorganisms, making it possible to obtain purified water in which both BOD and COD are reduced. As described above, according to the present invention, spent activated carbon is treated with microorganisms to activate only the adsorbed BOD portion, and while microbial treatment is continued, COD is adsorbed to the activated portion of regenerated activated carbon and BOD is also reduced. , has characteristics not found in conventional processing methods. However, since used activated carbon can be obtained at a very low price, it has the effect of dramatically reducing the cost required for purifying waste water and improving the purification efficiency by lowering the COD value.

In addition, this invention performs activated sludge treatment on raw water, leads the treated water to a reaction tank, introduces new activated carbon into the reaction tank, suspends it in the treated water and performs an adsorption treatment, and aerates and stirs the activated sludge. y, :BO is adsorbed on the activated carbon.
D is treated with microorganisms to adsorb COD to the activation part.

If the activated carbon is used in this manner until its COD adsorption capacity is saturated, its service life can be significantly increased. Conventionally, activated carbon was filled in a certain place, and the water to be treated passed through it to perform adsorption treatment, and its service life was until the adsorption capacity of activated carbon reached saturation. By simultaneously proceeding with flotation treatment and activation by microorganisms in Step 5, activated carbon can be converted into CO2.
Since it was used exclusively for D adsorption, its service life was significantly increased (for example, by a factor of 2). Therefore, the amount of activated carbon used could be halved and wastewater treatment costs could be reduced.

Next, embodiments of the invention will be described.

Example 1 (Fig. 1) BODsoo, CODsoo raw water was introduced into a settling tank as shown by arrow 6, aerated and stirred, and subjected to microbial treatment with activated sludge. ! ;~? Treated water (BODj)
ppm.

CODAOppm) is guided to the reaction tank λ as shown by arrow 7 (
717 days). On the other hand, the activated carbon used during sugar production is supplied to the culture tank 3 as shown by the arrow, microorganisms are cultured using aeration and activated sludge for 11 days, and the recycled activated carbon is transferred to the reaction tank 3 along with the treated water as shown by the arrow. Aeration and stirring were conducted for ~/days, and the mixture was passed through a flocculation sedimentation tank as shown by the arrow 1.
0, the discharged water is below BOD/ppm,
The COD was 10 ppm or less, which was below the high standard value. 5 in the figure is an air pump. The used activated carbon is not limited to the activated carbon used during sugar solution processing during sugar production, but
Activated carbon that adsorbs a large amount of BOD is more effective.

In addition, the recycled activated carbon once activated was 20%
Although it was used for several days, no decrease in purification ability was observed.

Example 2 (Fig. 2) To BOD 60 The raw water of CODSOO is led to the settling tank/in step 5 of arrow 6, aerated and stirred, and subjected to microbial treatment with activated sludge. ! ;～/days, treated water (BOD Oppm,
COD 40 ppm) is introduced into the reaction tank as shown by arrow 7 (inflow at lIm'//day). New activated carbon in the reaction tank
, lI♂ are contained in a floating state. In this case, about 10% of the spent activated carbon remains and retains microorganisms. In this way, the treated water and activated carbon are mixed by supplying air from the reaction tank Cohe Air Pump S to aerate and react for L/day while stirring, and then the mixture is discharged to one place as shown by arrow 10 after passing through the coagulation and sedimentation tank ÷. , Effluent water is BOD/ppm, below, COD#:
It was below lppm, which was below the discharge standard value. In the above example, the same activated carbon was used for tIo days, but B
Both OD and con'z were below standard values.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the invention, and FIG. 2 is a block diagram of another embodiment. /...Sedimentation tank ko...Reaction tank 3...Culture tank t...Coagulant sedimentation tank Diagram 2 procedural amendment (voluntary) March 37, 1927 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office ■, Indication of the case Prior to the Showa era Permit No. 12 Daqtto No. 2 Title of the invention Sewage treatment method using activated carbon 3 Relationship to the case of the person making the amendment Name of patent applicant Seibu General Equipment Co., Ltd. and 7 others 4, Representatives
Rito (Postal code 160) Address 2 Shinanomachi, Shinjuku-ku, Tokyo
No. 9 Tokumei Building Showa Month, Day 6, Claims column and Detailed Description of the Invention column 2 in the specification to be amended Contents of the amendment (1) The scope of the claims is as attached in the attached sheet (2) Specification book/
On the 77th line of the page, rBODJ is called [B()r)]
I am corrected. (3) Replacing the phrase “decreased” on page 3 // line of the specification with “
In the third line of the same page, the phrase ``amount significantly'' has been corrected to ``a significant amount.'' (ri) Delete "high degree" on page 5 // line of the specification. 1 Claims/ Activated sludge, treated water that has undergone microbial treatment with Ko2,
Activated carbon is a wastewater treatment method using activated carbon. A sewage treatment method using activated carbon according to claim 1, which is new activated carbon or activated carbon activated by microbial culture.

Claims (1)

[Scope of Claims] l Activated carbon is mixed into treated water that has undergone microbial treatment using activated sludge, and the water is aerated and stirred for a predetermined period of time to be adsorbed by activated carbon and treated with microorganisms, and then subjected to coagulation and sedimentation treatment before being discharged. Sewage treatment method using activated carbon, characterized in that the activated carbon is fresh activated carbon or activated carbon activated by microbial culture. A sewage treatment method using activated carbon according to claim 1, characterized in that spent activated carbon remains.