JPS59382A - Packing material adherering biomembane for waste water disposal - Google Patents

Abstract

PURPOSE:To obtain a pcking material for waste water disposal which can produce treated water stably at all times, by applying microbe-contg. paint onto the surface of a carrier such as plastics. CONSTITUTION:Microbe-contg. paint is applied onto the surface of a carrier such as plastics, sand or anthracite. A product obtd. by purely or mixedly cultivating bacteria, mold, yeast, etc. is used as said microbe, while acryl or epoxy resin paint or the like thereon is used as said paint. Thus, a packing material having adhered microbe immobilized is obtained, biomembranes rapidly adhere to the surface of said packing material at the time of staring the operation of waste water disposal, and the biomembranes rapidly regenerates themselves even when their exfoliation is caused during the operation.

Description

[Detailed description of the invention] In the present invention, microorganisms are attached to a filler in a film form.

Wastewater is treated by contacting it with biofilm. This invention relates to fillers used in biological treatment of wastewater.

Traditionally, there are two types of biofilm treatment methods for wastewater: fixed bed type and fluidized bed type, and the filling material for fixed bed type is plate-shaped, corrugated plate-shaped, or mesh-shaped plastics such as vinyl chloride and polyethylene. Granular materials such as sand and anthracite are used as the filler for the shattered fluidized bed type. These fillers are difficult to adhere to biofilm over a long period of time from the start of wastewater treatment operations.

Furthermore, even if a biofilm is attached, if it is peeled off, it takes a long time for the biofilm to attach again, and the quality of the treated water deteriorates significantly during the period when the biofilm is not attached.

The object of the present invention is to overcome the drawbacks of the prior art.

Our objective is to provide a filler that allows biofilm to adhere quickly at the start of operation, can be quickly regenerated even if the biofilm is detached, and can always produce stable and good quality treated water. This is achieved by immobilizing a microbial inoculum on a microorganism.

Namely, one filler according to the present invention is plastic.

It is characterized by coating the surface of a carrier such as sand or anthracite with a paint containing microorganisms.

The microorganism may be a pure culture or a mixed culture of bacteria, mold, yeast, actinomycetes, algae, and the like.

Paints that can be used in the present invention include acrylic resin paints, epoxy resin paints, acrylimide resin paints, acrylamide resin paints, styrene resin paints, polysaccharide derivative paints, polyurethane resin paints, and vinyl resin paints. etc. are mentioned.

Any paint can be used as long as it solidifies when left at room temperature or is heated to an extent that does not kill microorganisms, and does not release microorganisms into the liquid after solidification.

When microorganisms are mixed in such a paint and applied to the surface of a carrier, and the paint film is solidified, the microorganisms become immobilized and become accommodating.A filler is obtained. A biofilm quickly adheres to the surface of the filler at the start of operation, and even if peeling occurs during operation, the biofilm is quickly regenerated because of the presence of nine types of bacteria.

Next, the present invention will be explained in detail based on examples.

The present invention is not limited to this.

Example l Acrylamide-based resin paint 2 containing acrylamide and N, N/-methylenebisacrylamide, etc. as main components
t, sludge acclimatized with food wastewater from Company N was added so that the M L S S was 500 m9/l, and this paint was applied to a vinyl chloride corrugated plate. The thickness of the paint to be applied is 10 μ to 1
It may be of the order of I+III+. The filler thus obtained was placed in a 3 m3 aeration tank with a filling rate of 60% and an interval of 20
I++++++ was filled. Using this aeration tank, wastewater with a BOD of 500 mg/l was continuously treated for 30 days with a residence time of 6 hours, and the BOD of the treated water was measured. The results are shown in FIG.

During the period pH 7. The treatment was carried out with 3 to 5 m9/l of dissolved ξ element. Until the third day:! ! ,! J. The water quality was poor, but 4
From day 1, the biofilm grew to the extent that it was clearly visible to the naked eye, and good quality treated water was obtained.

As a conventional method, 2000 mg/z of sludge is added as seed sludge to the aeration tank without applying paint containing microorganisms to the filler.
The same wastewater was treated under the same conditions except for the addition of the compound, and the results are shown in FIG. At first, the treated water was cloudy and the water quality fluctuated and was unstable, and biofilm started to form on the 8th day, after which the water quality improved.

Example 2 Purely cultured Bacillus subtilis (BacillLLs sLLbt)
itig) was centrifuged, concentrated, and mixed into an acrylamide resin paint at a concentration of 08 cells/ml. Apply this paint to sand with a diameter of 0.5111111,
It was solidified at 35°C for 30 minutes. The thickness of the paint to be applied is 1
The solidification temperature may be about 0 μ to 1 μm, and the solidification temperature is not limited thereto. This sand was filled in an aeration tank of 1 m3 at a filling rate of 30%, and was made to flow by aeration, and the expansion rate was 5.
0%, BOD 200 m9/1 (DK company production process 凰水) was continuously treated with a residence time of 5 hours. The results after 30 days of boiling are shown in Figure 3. On the second day, the treated water became The breeding was also good.

Conventional methods do not apply paint containing microorganisms to the sand.
Figure 4 shows the results of treating the same wastewater under the same conditions except that sludge was added to the aeration tank at a rate of 2,000 μ/cm. Biofilm started to adhere on the 5th day, after which the water quality improved.

As can be seen from Examples 1 and 2, in the present invention, biofilm quickly adheres to the filler, and even if the biofilm peels off during long-term operation, the inoculum is fixed by the paint, so the biofilm cannot be regenerated. The process was carried out quickly and a consistently good quality of treated water was obtained.

On the other hand, in the conventional method, not only was the biofilm attached slowly, but also the biofilm became too thick during long-term operation and was likely to peel off due to shearing force, resulting in unstable treated water quality.

Although an acrylamide-based resin paint was used in the above examples, similar good results can be obtained by using other paints.

[Brief explanation of the drawing]

(2) Figure 1 is a diagram of the daily change in BOD of treated water when wastewater is subjected to fixed-bed contact aeration treatment using the filler of the present invention.
The figure shows the oral change in BOD of treated water in the case of fixed bed type contact aeration treatment using the conventional method. Figure 3 shows the BOD of treated water in the case of fluidized bed type aeration treatment of wastewater using the filler of the present invention.
Diagram of changes over time. FIG. 4 is a diagram showing the daily change in BOD of treated water in the case of fluidized bed aeration treatment according to the conventional method.

Claims (2)

[Claims] (1) Biofilm-attached light * Paulownia for wastewater treatment, which is characterized by coating the surface of a carrier such as plastic, sand, or anthracite with a paint containing microorganisms. (2) The filler according to claim 1, which uses a paint containing pure cultured microorganisms or mixed cultured microorganisms.