JP3700471B2 - Oil content treatment plant and oil content treatment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil content processing plant and an oil content processing method suitable for use with the oil content processing plant, for example.
[0002]
[Prior art]
In petrochemical factories, oil storage facilities, and other factories that handle oil, the oil permeates into the ground in the site due to dissipation during the operation of oil over time and leakage from damaged parts of the structure. Contamination and groundwater contamination may occur. Therefore, some remedial measures are indispensable when reusing these contaminated sites.
[0003]
This type of purification includes excavating soil that is contaminated with oil, crushing and removing concrete rags that are soaked in oil, transporting them to a managed landfill site, landfilling, etc. For example, there is a method of building a fixed oil treatment facility such as an oil separator facility and performing soil purification using this facility.
[0004]
[Problems to be solved by the invention]
However, in the former landfill method, the acquisition of the site itself becomes a problem due to environmental problems or lack of site. In addition, the latter fixed oil treatment facility is usually a concrete structure, and when it is newly constructed in a place without these facilities, it is necessary not only for labor and time but also to secure a construction site. Yes, once the process is completed, the removal work becomes troublesome. Furthermore, the treatment method by the oil separator facility uses a chemical addition device and then introduces air to float and separate the oil, so that it is difficult to separate the earth and sand from the oil. In addition, although the oil component floating on the upper layer was finally adsorbed by an oil mat or the like, there was a drawback that continuous processing work could not be performed.
[0005]
The present invention solves the above-described problems, and uses an oil component treatment plant and an oil component treatment plant that can be easily installed and removed as temporary equipment, and can continuously perform oil component treatment and muddy water treatment. A suitable oil content processing method is provided.
[0006]
In order to achieve the above object, the oil treatment plant of the present invention comprises a storage tank into which soil and sand mixed with oil are introduced and mixed, and suspension water supplied from the storage tank and various chemicals for separating oil and mud. Into the turbid water mixed with mud that settles in the upper layer, the water layer and the lower layer that are temporarily stored in a stationary state and are oily flocs A stationary tank to be separated, and a water separation tank connected to a lower layer of the stationary tank, and an oil floc is taken out from the upper layer of the stationary tank, and the water layer in the moisture separation tank is neutralized and discharged. and state, and are not to remove process the balance mud, the electrostatic置槽and water separation tank, a pair arranged relative to the chemical treatment bath, one water separating tank to the static置貯cut state, the other water separation Alternate tanks to separate processing And it is characterized in work to Rukoto. Therefore, according to the present invention, each tank can be constructed with a simple structure such as a prefabricated material, so that the installation and removal work after oil removal can be easily performed, and can be diverted depending on the processing place. In addition, the separation tank in the present invention is arranged in a pair with respect to the chemical treatment tank, and by switching one pipe, the one separation tank is placed in a stationary storage state, and the other separation tank is operated alternately in the separation treatment state. Continuous processing is possible.
[0007]
The oil treatment plant of the present invention is a chemical solution in which earth and sand mixed with oil and water are charged and mixed, and suspended water supplied from the storage tank is stored and various chemicals for separating oil and mud are injected and mixed. A stationary tank that separates the turbid water mixed with mud that settles in the treatment tank and the chemical liquid treatment tank connected to the chemical liquid treatment tank and temporarily stores the liquid mixture in a stationary state and becomes an oily floc; And a water separation tank connected to the lower layer of the stationary tank, take out the oil floc from the upper layer of the stationary tank, discharge the neutralized water layer in the moisture separation tank, and remove it as the remaining mud a oil treatment plant is intended to be processed, the chemical processing reservoir comprises a first compartment alkaline agent is introduced mixed with storing the colloid suspension water overflowed from the first compartment, flocculant throw A second compartment to be mixed together to store the aggregate mixture suspended water overflows from the third tank, characterized in that it partitioned into the third compartment polymer flocculant is introduced mixed is there. Thereby , a chemical | medical solution process can be performed sequentially in one tank.
[0008]
Further, the oil content treatment method of the present invention is an oil content treatment method using the above oil content treatment plant , the step of colloiding the suspension water mixed with the oil content, and agglomerating the colloidal suspension water, the specific gravity difference of each Is characterized by comprising a step of separating oil, water and turbid water into three layers and a step of separating and collecting each separated layer. Therefore, according to the method of the present invention, compared with the conventional method using an oil separator, since air is not used, it is possible to separate and collect earth and sand and water.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, FIG. 1 shows a schematic procedure of the method of the present invention. In the method of the present invention, building waste materials such as soil containing sand containing oil, or concrete galvanized by crushing, and raw water in which water is suspended are placed in a tank, and then slaked lime is added as an alkaline agent, followed by a stirring operation. By doing so, the pH is raised to 10 or more to make a colloidal material.
[0010]
Next, a flocculant (PAC: polyaluminum chloride, hereinafter referred to as PAC) is added to the colloidal treatment liquid and stirred, so that solids in the suspension are obtained by neutralization of charge and physicochemical adsorption. Aggregate the minutes. Thereafter, a polymer flocculant such as Cliff Rock (trade name), sodium polyacrylate, polyacrylamide is added and stirred to increase the particle size by strengthening the binding force of oil or solid floc. .
[0011]
After the above treatment, the treatment liquid is allowed to stand to float the oil floc, and solids, that is, earth and sand or crushed concrete components are precipitated and separated. After separation, the oil in the upper layer is separated and recovered. Further, the precipitate and water are further precipitated to separate them. The separated water is neutralized by pH treatment and discharged into a drain. In addition, the sediment that has settled in the tank is drained by draining the tank after the water is discharged. Since the soil after treatment has the same properties as ordinary construction residual soil, it can be used as landfill sand.
[0012]
FIG. 2 is a plan view and a side view of the oil processing plant for embodying the above procedure, and FIG. 3 is a detailed flow sheet of the processing plant. In this figure, this treatment plant is temporarily installed in a construction site such as the above-mentioned factory ruins where oil has permeated, and a suspension of excavated soil and water mixed with oil is introduced. Are stored in the storage tank 1, the chemical treatment tank 2 disposed downstream of the storage tank 1, the pair of stationary tanks 3 disposed downstream of the chemical treatment tank 2, and the downstream of each stationary tank 3. The arranged water separation tank 4, the buffer tank 5 arranged downstream of each water separation tank 4, and the collection tank 6 arranged in the vicinity of the buffer tank 5 and collecting the oil content floc separated in the stationary tank 3. And a flock collection frame 7, which are continuously and linearly connected from the upstream side to the downstream side via piping.
[0013]
In addition to the above, the oil processing plant according to the present embodiment includes a chemical solution addition such as the PCA tank 8, the polymer high-concentration tank 9, the dilution tank 10, the storage tank 11, the dilute sulfuric acid tank 12, and the slaked lime metering device 13. Peripheral devices and power supply for the control, and the control panel 14 are arranged.
[0014]
The above tanks and devices are prefabricated as shown in FIGS. 1 and 2 and can be separated from each other by connecting and disassembling the pipes. Easy to assemble. Further, when the processing is completed, the pipes can be removed and removed separately, and can be diverted to a place that requires this type of processing.
[0015]
As shown in FIG. 3, the processing suspension charged into the storage tank 1 flows downstream from the lower side of the partition provided at the center, and enters the chemical processing tank 2 through the piping. The chemical treatment tank 2 is partitioned from the upstream side to the downstream side by the three partition dam plates 15, and each of them sequentially flows from the upstream side to the downstream side by overflowing the partition dam plate 15.
[0016]
In the first compartment located upstream, slaked lime is charged through the slaked lime quantitative charging device 15 and stirred and mixed by the stirring pump P, and the liquid property is adjusted to pH 10 or more, so that it becomes colloidal. Next, PAC is introduced into the second compartment, and is similarly stirred and mixed by the stirring pump. Further, a polymer flocculant is charged into the third compartment, and mixed and stirred by the stirring pump P.
[0017]
The suspension treated with the above chemical solution is introduced into the stationary tank 3 from the fourth section through a pipe, and temporarily stored in a substantially stationary state, whereby the suspension treated with the chemical solution is an upper layer. It is separated into an oily floc and a suspension containing water and earth and sand. A partition weir plate 16 is disposed in the center of the stationary tank, and a liquid containing a large amount of surface oil floc overflowing from the upstream side sequentially enters the downstream compartment and accumulates with the oil floc floating on the surface. The
[0018]
Further, a recovery plate 17 is disposed near the liquid level in the downstream section, and the oil component flock is supplied to the recovery tank 6 and the flock recovery frame 7 side through the recovery plate 17 and recovered there. Reference numeral 18 denotes an oil sheet for adsorbing oil that floats on the water surface in the downstream section. Furthermore, the lower layer side of the downstream section is connected to the water separation tank 4 through a pipe, and suspended water mixed with earth and sand collected in the lower layer is supplied to the water separation tank 4.
[0019]
The water separation tank 4 is divided into two compartments by a perforated plate 19, a pH meter 20 is arranged in the upstream compartment, a stirrer 21 is arranged in the downstream compartment, and dilute sulfuric acid is supplied from the dilute sulfuric acid tank 12. The liquid is neutralized. By this neutralization, the earth and sand are coagulated from the suspended state and deposited on the bottom of the tank. Further, the supernatant, that is, the neutralized water is discharged to the outside through the buffer tank 5. The buffer tank 5 is also provided with a partition weir plate 22 and a pH meter 23 to perform a final check immediately before discharge.
[0020]
Moreover, the neutralization process in the above-mentioned water separation tank 4 and the soil removal work of the mud accumulated at the bottom have not been carried out in a batch manner. Is made into two systems, and while one batch processing is being performed, the piping is switched to the other side, thereby enabling continuous operation.
[0021]
【The invention's effect】
As is apparent from the above description, the oil treatment plant according to the present invention can be easily installed and removed as a temporary facility, and can perform oil treatment and muddy water treatment continuously. In the oil treatment method of the present invention, since the suspension is not stirred by air, moisture and mud can be separated and recovered after oil separation.
[Brief description of the drawings]
FIG. 1 is a flowchart showing an outline of a processing procedure of a method of the present invention.
FIG. 2 is a plan view and a side view of an oil content processing plant of the present invention to which the processing procedure is applied.
FIG. 3 is a detailed flow sheet of the processing plant.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage tank 2 Chemical treatment tank 3 Stationary tank 4 Moisture separation tank 8 PAC tank 9 High polymer concentration tank 10 Dilution tank 11 Storage tank 12 Dilute sulfuric acid tank 13 Slaked lime fixed quantity supply apparatus

Claims (3)

A storage tank into which soil and sand mixed with oil are mixed, a chemical treatment tank for storing suspension water supplied from the storage tank and injecting and mixing various chemicals for oil and mud separation, and a connection to the chemical treatment tank The liquid mixture that has been treated with chemicals is temporarily stored in a stationary state and is separated into muddy water mixed with mud that settles in an upper layer, an aqueous layer, and a lower layer that become oily flocs, and connected to a lower layer of the stationary tank A water separation tank,
Wherein from the upper layer of the electrostatic置槽extraction of oil flocs, and released by neutralizing the aqueous layer of the water separation tank state, and are not to remove process the balance mud,
The electrostatic置槽and water separation tank, a pair arranged relative to the chemical treatment bath, one water separating tank to the static置貯distillation conditions, that you run alternately the other water separation tank for the separation processing state A characteristic oil processing plant. A storage tank into which soil and sand mixed with oil are mixed, a chemical treatment tank for storing suspension water supplied from the storage tank and injecting and mixing various chemicals for oil and mud separation, and a connection to the chemical treatment tank The liquid mixture that has been treated with chemicals is temporarily stored in a stationary state and is separated into muddy water mixed with mud that settles in an upper layer, an aqueous layer, and a lower layer that become oily flocs, and connected to a lower layer of the stationary tank A water separation tank,
An oil content processing plant that takes out the oil floc from the upper layer of the stationary tank, neutralizes and discharges the water layer in the water separation tank, and removes it as a residual mud,
The chemical treatment storage tank includes a first section into which an alkaline agent is charged and mixed, a second section into which a coagulant is charged and mixed while storing colloidal suspension water overflowed from the first section, and a third storage tank. The oil content processing plant is characterized in that the agglomerate mixed suspension water overflowing from the tank is stored and partitioned into a third section into which the polymer flocculant is charged and mixed. An oil content processing method using the oil content processing plant according to claim 1 or 2,
Colloidalization of oil-mixed sediment suspension water, agglomeration of colloidal suspension water and separation into three layers of oil, moisture and turbid water by each specific gravity difference, and separation of each separated layer An oil content processing method comprising a step of collecting and processing.

Images