JPS622876B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention aims to provide a novel wastewater treatment device that can recover reusable substances from wastewater containing oil, protein, etc., and can also reuse treated water. Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. In the present invention, wastewater to be treated is introduced into a tank 2 in which 60% to 70% of the capacity of the tank contains a flocculent-like flocculant 1 with a specific gravity of 1.0 or less and many uneven surfaces, and the flocculant is suspended. The present invention also relates to an apparatus for implementing the above-mentioned method for treating wastewater. FIG. 1 is an explanatory diagram illustrating the floating state of the aggregate, FIG. 2 is a longitudinal sectional view of the apparatus of the present invention, and FIG. 3 is a plan view of the baffle plate portion of the apparatus of the present invention. 3 shows the device of the present invention. The device of the present invention has the following configuration. That is, inside the vertical cylindrical outer box 3A, an upper chamber 3D, an agglomerate storage chamber 3E, and a lower chamber 3F are formed in order from the top by an upper flocculation prevention net 3B and a lower flocculation prevention net 3C. However, above the side wall of the upper chamber, a drainage water inlet 3G and an oil recovery outlet 3H are provided at a position higher than the water inlet, and an air vent 3I is provided on or near the top plate of the upper chamber. An appropriate number of baffle plates 3J are placed in the upper chamber, an aggregate material 1 with a specific gravity of 1.0 or less is stored in the agglomerate storage chamber, and an appropriate number of baffle plates 3L are placed in the lower chamber. is provided with an outlet 3M for taking out the sediment, and above the lower chamber is provided an outlet 3M for taking out the treated water.
This is a wastewater treatment device characterized by providing nitrogen. The device of the present invention consists of an upper chamber, an agglomerate storage chamber, and a lower chamber, and the side wall of the upper chamber is provided with a drainage water inlet and an oil recovery outlet at a position above the side wall of the upper chamber. Regarding the positional relationship between the drainage water inlet and the oil recovery outlet, as shown in FIG. 2, it is preferable that the drainage water inlet is located at a lower position than the oil recovery outlet. This is because by positioning it in this way, the coarsened oil that rises inside the device can be taken out from the oil recovery outlet quite naturally. Therefore, in the case of the present invention, there is no need to provide a special partition to separate the drainage water inlet and the oil recovery outlet. Air vent 3I is installed on the top plate of the upper chamber of the device of the present invention.
In addition, an appropriate number of baffle plates 3J are arranged in the upper chamber to disturb the flow of water inside the chamber. Although the air vent 3I is provided on the top plate in FIG. 2, there is no particular problem in providing the air vent 3I on the side wall near the top plate. The agglomerate storage chamber of the apparatus of the present invention stores an agglomerate 1 having a specific gravity of 1.0 or less. The storage ratio of aggregate material in this storage chamber is approximately 60 to 70% of the capacity of the storage chamber.
It is preferable to adjust the amount to about % in order to activate the flow state of the flocculant and increase the physical contact with the oil. Further, a suitable number of baffle plates 3L are installed in the lower chamber of the apparatus of the present invention, a sediment outlet 3M is provided at the bottom, and a treated water outlet 3N is provided above the lower chamber. Since the apparatus of the present invention is suitable for processing while floating (flowing) the agglomerate, it is preferable that the specific gravity of the agglomerate applied to the apparatus of the present invention is 1.0 or less. This is because the function of the apparatus of the present invention is best exhibited in the case of an aggregate material having such a specific gravity. Such aggregate materials include polymer foams or porous polymers, and the materials used include synthetic rubber, polyacrylonitrile resin, etc., and specific gravity such as Osman (trademark)
0.75 polymer single cell or polymer porous material can be adopted. As for the shape of the agglomerate, in addition to the above-mentioned confetti-like shape, any shape such as spherical or cylindrical can be used. The size of the agglomerate is not particularly specified, but in order to increase contact with the oil under flow conditions, the device of the present invention uses a diameter of 3.
~5 mm of agglomerate was used. As is clear from the above description, the device of the present invention is a vertical device that treats wastewater by flowing it downward, and the flow of the wastewater of the present invention is as follows. First, wastewater containing oil, protein, etc. discharged from surimi and seafood processing plants is collected from the wastewater water inlet 3 above.
Water is supplied from G to the upper chamber 3D. In this upper chamber, a storage chamber 3E stores the flocculant 1 while the supplied water is disturbed by an appropriate number of baffle plates 3J.
flows down to. In this storage chamber 3E, the flocculant 1 forms a floating (fluid) state as shown in FIG. is adsorbed to and becomes coarse. The oil and the like that have been adsorbed and coarsened by the flocculant 1 are peeled off from the flocculant 1 because the flocculant 1 is in a floating (fluid) state and is disturbed. The stripped oil ascends within the apparatus, while proteins, etc. descend within the apparatus. In this case, the waste water is disturbed by the baffle plate, and the siphon principle is adopted, so the reusable substances are adsorbed and peeled off by the flocculating material and then settle, while the treated water is treated by the siphon principle. It will be discharged from outlet 3N. In other words, the oil in the upper part is discharged from the outlet 3H, and the protein accumulated in the lower part of the lower chamber is discharged from the outlet 3M.
can be taken out and recovered. In addition, 3O
indicates a means for promoting the floating (flowing) movement of the adsorbent as necessary, and indicates an air pipe. Below, the results obtained by operating the apparatus of the present invention shown in FIG. 2 will be described. The wastewater used during this operation was from a surimi factory, which is a seafood processing plant, and contains so-called impurities such as oil and protein listed in the table below, and the amount of these impurities varies depending on the season. It changes a lot. In the table, SS is suspended solids containing surimi, a fine protein in wastewater, and N
-Hex is an abbreviation for n-hexane extracted substance,
This is one of the water quality measurement items that corresponds to the amount of oil in wastewater. This wastewater was temporarily stored in an underground pit serving as a raw water tank, from which it was pumped up by a submersible pump and forcibly supplied into the apparatus of the present invention through the wastewater inlet shown in FIG. 2 in a downward flow. The agglomerate is stored in the agglomerate storage chamber in the device so as to occupy 70% of its volume. As for this agglomeration material, there are 500 spherical polymeric single cell material made of polyacrylonitrile and synthetic rubber, and spherical polymeric porous material made of the same material.
% (by volume) is used, and the specific gravity of this mixture is
It was 0.72. The downward flow of the wastewater supplied from the above-mentioned wastewater inlet is disturbed by the baffle plate in the upper chamber, and the flocculent in the flocculant storage chamber is agitated as shown in Figure 1. The particles repeatedly agglomerated and peeled off on the surface of the agglomerate. Thereafter, the separated oil rose against the downward flow and was taken out from the oil recovery outlet, and the suspended solids were collected from the suspended solids outlet. The results are shown below.

【table】

[Table] From the above results, the device of the present invention has SS and n-
It can be efficiently applied even when the amount of hexane extracted material is very small. In other words, it is fully applicable to large changes in SS and n-hexane extracted substances depending on the season. Furthermore, the impurity removal rate is also very high.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a processing method to be realized by the present invention, FIG. 2 is a longitudinal sectional view of the present invention, and FIG. 3 is a plan view of a baffle plate portion. 1... Agglomerate, 2... Container, 3... Processing device,
3A... Outer box, 3B, 3C... Net, 3D... Upper chamber, 3E... Aggregate storage chamber, 3F... Lower chamber, 3
G...Drain water inlet, 3H...Oil recovery outlet, 3
I... Air bleed, 3J, 3L... Baffle plate, 3
M, 3N...Sedimented substance outlet.

Claims (1)

[Claims] 1 Inside the vertical cylindrical outer box, an upper chamber, an aggregate storage chamber, and a lower chamber are formed in order from the top by an upper aggregate floating prevention net and a lower aggregate settling prevention net,
A drainage water inlet and an oil recovery outlet are provided above the side wall of the upper chamber at a higher position than the water inlet, an air vent is provided on or near the top plate of the upper chamber, and an air vent is provided in the upper chamber. An appropriate number of plates are arranged, an aggregate with a specific gravity of 1.0 or less is stored in the above-mentioned aggregate storage chamber, an appropriate number of baffle plates are placed in the lower chamber, and an outlet for taking out the sediment is provided at the bottom. A wastewater treatment device further comprising: a treated water outlet provided above the lower chamber.