JP2002219360A - Oil remover for oil containing liquid waste and oil removing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil remover capable of stably and effectively removing oil from an oil containing liquid waste and to provide an oil removing method using the same. SOLUTION: The oil remover for an oil containing liquid waste comprises a chemical synthetic fiber of which the thickness is several μm-1 mm and the length is several mm-several cm and a surfactant. The chemical synthetic fiber may be a regenerated fiber regenerated from a plastic waste and the surfactant may be an anionic type or a non ionic type surfactant. Further, the oil removing method from the oil containing liquid waste is characterized by mixing the oil remover for an oil containing liquid waste with the oil containing liquid waste and separating the synthetic fiber having the oil adsorbed therein from the material to be treated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the removal of oil from oil-containing liquid waste, and more particularly to the removal of oil such as organic sludge and garbage generated in the treatment of wastewater such as sewage, human waste and industrial wastewater. The present invention relates to an oil removing agent used for separating oil from waste and an oil removing method using the same.

[0002]

2. Description of the Related Art It is important to treat oil contained in organic sludge, garbage, industrial waste, and the like, which is generated in the treatment of wastewater such as sewage, human waste, and industrial wastewater. If these oil-containing liquid wastes are left as they are, there are problems such as generation of odor due to decomposition of the oil contained therein, deterioration of dehydration performance observed in water content in the dehydration treatment, or scum and inhibition of fermentation treatment in anaerobic fermentation treatment. The oil of the oil-containing liquid waste is mineral oil, animals and plants, or a mixture thereof. As a method for removing the oil from the oil-containing liquid waste, there is a method of removing the oil floating on the liquid surface by allowing it to stand still or separation by a screen. If it is a highly fluid mineral oil, lubricating oil, or the like, the adsorption treatment using a commercially available oil mat is possible.

[0003] As for animal and vegetable oils, biopharmaceuticals containing lipase, which is an oil-degrading enzyme, have been put to practical use for oil flowing into a building pit. Animal and vegetable oils that become solid at room temperature, when the screen is separated, block the screen and significantly reduce the workability of oil removal. Also, the handling of the separated oil is very poor. Further, such a conventional method has the following problems. (1) The screen separation method is intended for solid oils and cannot be applied to emulsified oils or finely dispersed oils. (2) In the screen separation method, there are many problems in blockage of the screen by the target oil, handling of the separated oil, and disposal thereof. (3) It is difficult to treat a large amount of oil-containing liquid waste in a short period of time due to the slow lipolysis reaction of biological products containing lipase.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention provides an oil removing agent capable of removing oil stably and effectively from oil-containing liquid waste, and an oil removing agent using the same. It is an object to provide a method.

[0005]

In order to solve the above problems, according to the present invention, the thickness is several μm to 1 mm and the length is several mm.
This is an oil remover for oil-containing liquid waste consisting of synthetic fibers of up to several cm. In the present invention, the thickness is several μm.
synthetic fiber 10 having a length of m to 1 mm and a length of several mm to several cm
The oil remover for oil-containing liquid waste is composed of 0 parts by weight and 1 to 20 parts by weight of a surfactant. In the oil-containing liquid waste oil remover, as the synthetic fibers, regenerated fibers regenerated from plastic waste can be used, and as the surfactant, an anionic or nonionic surfactant is used. Can be. Further, according to the present invention, the oil-containing liquid waste oil remover described above is mixed with an oil-containing liquid waste, and the oil-containing liquid waste is characterized in that the synthetic fibers having adsorbed oil are separated from the material to be treated. Oil removal method.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The present invention has a thickness of several μm to 1 mm and a length of several mm to
Mix a few cm of synthetic fiber (hereinafter referred to as synthetic fiber) or an oil remover obtained by impregnating the synthetic fiber with a surfactant, and mix the oil remover and oil-containing liquid waste, and absorb the oil with a screen. This is a method for removing oil from oil-containing liquid waste in which separated synthetic fibers are separated from an object to be treated. The oil-containing liquid waste of the present invention is human waste containing animal and vegetable oils and mineral oil, septic tank sludge, excess sludge, inorganic sludge, and other oil-containing liquid waste. The synthetic fiber used in the present invention is a polyester fiber, a polypropylene fiber, an acrylonitrile fiber, a recycled fiber obtained from a PET bottle, or the like discarded from the chemical fiber manufacturing process. The synthetic fiber of the present invention has a thickness of several μm to 1 m.
m, the length is several mm to several cm. Thinner fibers are more convenient for impregnating oil removal performance and various chemicals, but are more difficult to process into fibers. When a commercially available synthetic fiber is used in the present invention, its thickness is preferably 5 μm to 100 μm, and more preferably 5 μm to 15 μm. In addition, the length is preferably several mm to 1 cm in consideration of workability in forming a slurry and separation performance on a screen.

The method of crushing synthetic fibers into a slurry is as follows.
An existing pulper or mechanical stirrer can be used.
0.1% by weight of a commercially available surfactant per synthetic fiber weight
By adding below, it can be easily dispersed in the liquid by a mechanical stirrer. An organic polymer flocculant or an inorganic flocculant can be used in the oil separation step. Synthetic fibers can be slurried with treated water or sludge itself, which is easily obtained in industrial pumping and sewage facilities. Further, the synthetic fiber and the regenerated fiber of the present invention can be directly added to the oil-containing liquid waste. A commercially available screen such as a wedge wire or a berth screen can be used. There is no restriction on the size of the opening, and any shape can be used as long as it can drain the water effectively. If the oil-containing liquid waste has a high sludge concentration or solid concentration of 5% or more and cannot be separated by a screen, a commercially available dehydrator or concentrator can be used. They are belt press type and screw press type,
Both centrifugation and filter press type can be used.

[0008] Recycled fibers are synthetic fibers regenerated from plastic waste. Recent container and package recycling methods are improving methods for collecting and recycling plastic waste, particularly PET bottles. Reduction of environmental load,
As the use of recycled products is promoted by the public and private sectors, the use of synthetic fibers, which are recycled products from waste, as dehydration aids is desirable for the reuse of waste. Next, an oil removing agent in which the synthetic fiber of the present invention is impregnated with a surfactant and a method of removing oil from oil-containing liquid waste will be described. To adsorb the oil, a hydrophobic substance is good, but it cannot be dispersed in the liquid and remains floating on the liquid surface, and the oil does not sufficiently contact with the oil, making it difficult to remove the oil. Surfactants that have a strong affinity for oil and have an affinity for water are suitable for removing oil from liquid.

As the surfactant, commercially available anionic and nonionic surfactants can be used, and as the surfactant of the present invention, non-on surfactants are preferable. As the anionic surfactant, an aliphatic carboxylic acid such as palmitic acid, oleic acid and lauric acid, or an alkali ether carboxylic acid type anionic surfactant having a polyoxyethylene chain and a polyoxymethylene chain can be used. As the nonionic surfactant, polyoxyethylene type polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, and polyhydric alcohol ester ether can be suitably used. Polyhydric alcohol ester ethers include polyoxyethylene sorbitan oleate and polyoxyethylene oleate.

As a method of impregnating a synthetic fiber with a surfactant, the synthetic fiber can be immersed in a surfactant aqueous solution or a surfactant itself. The water content of the synthetic fiber is about 20 parts by weight of water with respect to 100 parts by weight of the synthetic fiber.
The surfactant content of the synthetic fiber is preferably 1 to 20 parts by weight of the surfactant based on 100 parts by weight of the synthetic fiber. If the surfactant content of the synthetic fiber exceeds 20 parts by weight, even if the water content of the synthetic fiber is at the upper limit or the raw surfactant solution itself is impregnated at more than 20 parts by weight, the surplus surfactant is used. Will emulsify the oil from the oil-containing liquid waste,
This results in inhibiting oil adsorption on the synthetic fibers, which is not preferable. On the other hand, if the amount is less than 1 part by weight, the effect of adsorbing oil on the synthetic fibers is low and not practical.

[0011]

EXAMPLES The present invention will be described in detail below, but the present invention is not limited thereto. Example 1 A mixture of 100 parts of combined-type septic tank sludge and 1 part of margarine and 1 part of corn oil mixed with a juicer mixer was used as a simulated oil-containing liquid waste. Table 1 shows the properties.

[Table 1]

To 2 liters of the simulated oil-impregnated liquid waste, a predetermined amount of PET regenerated fiber and polyacrylonitrile fiber (unimpregnated fiber, thickness of 10 μm to 500 μm, length of 10 mm to 15 mm) of various shapes is added, and a juicer is added. The mixture was mixed at 300 rpm for 5 minutes, immediately placed in a cylindrical container having an inner diameter of 100 mm and a metal mesh with an opening of 1.18 mm at the bottom thereof, and the outflow of the separated solution and the hexane extract substance concentration of the separated solution were measured. PET recycled fiber is used to wash, crush and pelletize PET bottles collected in the city,
This was melted and spun at 260 ° C. Cool down,
The wound long fiber is cut into 10 mm to 15 mm. Polyacrylonitrile is obtained by cutting and loosening waste from the production of acrylic products to about 10 mm.
Table 2 shows the results. PET with a thickness of 5 to 15 μm, based on the screen separation performance and the removal rate of hexane extractables
The oil adsorption of the recycled fiber was good. In particular, drainage and separation of sludge were good.

[0013]

[Table 2]

Example 2 PET regenerated fiber and polyacrylonitrile fiber impregnated with various chemicals were added to the simulated oil-impregnated liquid waste of Example 1 in an amount of 1% as dry weight of unimpregnated fiber per liquid amount.
The same test was performed. 5 to 15 μm in thickness, 10 to 15 in length
mm recycled PET fiber (Examples 2-1 to 2-6) and polyacrylonitrile (Examples 2-7 to 2-12) with sodium lauryl sulfate as an anionic surfactant and polyoxyethylene as a nonionic surfactant The oil adsorbent was prepared by impregnation with lauryl ether. A predetermined amount of sodium lauryl sulfate and water are added to PET fiber, and after kneading,
What was dried for hours was used. Further, a predetermined amount of polyoxyethylene lauryl ether is added to PET fiber,
The mixture was kneaded at ５０50 ° C. and impregnated into PET fibers. Table 3 shows the results.

[0015]

[Table 3]

Comparative Example 1 A crushed waste paper from newsprint and peat moss having a fiber length of about 10 mm were added to the simulated oil-containing liquid waste of Example 1;
The same test as in Example 1 was performed. Tap water and newsprint or tap water and peat moss were disintegrated with a mixer and used as a 5% aqueous solution for the test. Table 4 shows the results. The peat moss and peat moss had a low oil removal effect.

[0017]

[Table 4]

[0018]

The present invention has the following effects by applying synthetic fibers or regenerated fibers alone or synthetic fibers or regenerated fibers impregnated with chemicals to oil removal of oil-containing liquid waste. (1) Efficient oil removal is possible with a simple method. (2) Disposal of separated oil is easy and workability is improved. (3) The blockage of the screen can be eliminated, and the processing amount and workability can be improved.

Claims (5)

[Claims] 1. A thickness of several μm to 1 mm and a length of several mm to
Oil remover for oil-containing liquid waste consisting of several cm of synthetic fibers. 2. A thickness of several μm to 1 mm and a length of several mm to
100 parts by weight of synthetic fibers of several cm and surfactant 1
20 parts by weight of an oil remover for oil-containing liquid waste. 3. The oil remover for an oil-containing liquid waste according to claim 1, wherein the synthetic fiber is a recycled fiber made from plastic waste. 4. The oil remover for oil-containing liquid waste according to claim 2, wherein the surfactant is an anionic or nonionic surfactant. 5. An oil-containing liquid waste oil remover according to claim 1, which is mixed with an oil-containing liquid waste,
A method for removing oil from an oil-containing liquid waste, wherein the synthetic fiber having adsorbed oil is separated from an object to be treated.