JPH0410881Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention is applicable to various oil-water mixtures, especially urban sewage,
The present invention relates to an oil adsorbent suitable for removing oil contained in industrial wastewater.

BACKGROUND ART Conventionally, activated carbon has been used as an adsorbent for oil droplets dispersed in water. However, the ability of activated carbon to adsorb oil droplets is not very good, and it is considered that oil-absorbing rubber powder may be used. Norbornene rubber, which is obtained by ring-opening polymerization of norbornene and is a typical oil-absorbing rubber, has high compatibility with petroleum oils due to its composition and is insoluble in water, so it can be easily absorbed in water. It has excellent properties as an oil droplet collector. Compared to activated carbon and inorganic mineral adsorbents, norbornene rubber has extremely high oil adsorption ability. Moreover, the adsorption rate is comparable to that of other adsorbents. The only way to use oil-absorbing rubber powder for oil absorption is to remove it to collect oil on the water surface, but the method for using it to collect oil droplets dispersed in water has not yet been established. do not have.

Problems that the invention aims to solve Norbornene rubber has extremely superior oil adsorption ability compared to activated carbon, etc., but it is compatible with petroleum oils and absorbs oil and turns into a gel. For example, if you fill a treatment tank with norbornene-based rubber powder and introduce oil-containing water to be treated, this may cause clogging on the inlet side or uneven flow. There is a drawback that it cannot be used.

Measures to Solve the Problems In view of the above drawbacks, the inventors of the present invention have considered using norbornene rubber powder as a typical oil-absorbing rubber to prevent clogging due to gelation of the powder particles. If the rubber powder is fixed on a carrier sheet, this sheet is placed in a packed bed, and the sheets are isolated using a spacer, etc., this isolated space is secured as a passage for treated water, and the excellent properties of oil-absorbing rubber powder are achieved. This led to the completion of the present invention.

The oil adsorbent according to the present invention is characterized in that norbornene rubber powder is fixed to at least one side of an oil-resistant carrier sheet via an adhesive.

A partially enlarged sectional view of the oil adsorbent according to the present invention is shown in FIG. Norbornene rubber particles 3 are fixed on the agent layer. As the carrier sheet made of a polymeric material, among commonly used sheets such as rubber sheets and plastic sheets, a sheet made of a material with excellent oil resistance or a sheet whose surface has been treated with oil resistance is preferably used. A rubber latex having good compatibility with norbornene rubber is coated on one side of the sheet by coating, spraying, etc., and norbornene rubber particles are attached thereon and heated and dried to fix the particles. Of course, the adhesive may be a resin emulsion other than rubber.

Norbornene rubber is usually a powder with a particle size of 1 mm or less, and an average of 0.3 to 0.4 mm. It is dispersed on the surface by spreading or spraying, and is adhered to the surface in a dot pattern. The excess is brushed off, and the adhesive is applied. Cure and fix. The powdered rubber may be fixed to one side of the carrier sheet as in the above embodiment, or may be fixed to both sides.

Function As an application example of the present invention, for example, as shown in FIG. Alternatively, the sheets can be hung in the treatment tank at appropriate intervals, and the space between the sheets is used as a flow path for the water to be treated (see Figure B), or the sheets can be separated using an appropriate spacer. Methods such as filling a filling tank can be adopted.

Effects of the invention To give an example of the adsorption of norbornene-based rubber, kerosene was dispersed in water to make treated water with a concentration of 100 ppm, and 100 mg of rubber was added to 250 ml of this treated water, and the oil absorption was tested. Residual oil concentration 10ppm,
At a removal rate of 90% and a concentration of 10 ppm, the adsorption equivalent (the number of grams of oil adsorbed to 1 gram of adsorbent) is 0.1 g/g.
It was hot. On the other hand, the oil absorption equivalent of activated carbon at 10 ppm is 0.024 g/g, which is four times better than activated carbon.

By configuring such norbornene-based rubber as the oil adsorbent of the present invention, it can be used as a filler for wastewater treatment equipment and effectively remove oil from water to be treated. Furthermore, oil in water or on the water surface can be effectively removed by administering and spreading the oil adsorbent of the present invention. Furthermore, since the oil adsorbent of the present invention is in the form of a sheet, it can be rolled up and handled, making it easy to handle.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged sectional view of the oil adsorbent according to the present invention, and FIGS. 2A and 2B are longitudinal sectional views of a water treatment tank to which the oil adsorbent of the present invention is applied, respectively. DESCRIPTION OF SYMBOLS 1... Carrier sheet, 2... Adhesive layer, 3... Rubber particles, 4... Oil adsorption material.

Claims (1)

[Scope of utility model registration request] An oil adsorbent made by adhering norbornene rubber powder to at least one side of an oil-resistant carrier sheet via an adhesive.