JPS5943204B2 - Manufacturing method of polyacrylamide solid flocculant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a solid flocculant by solidifying polyacrylamide.

In the past, large amounts of muddy water were generated upstream of rivers due to civil engineering and construction work, causing pollution downstream due to foamy water, which was particularly detrimental to fish farming, drinking water, and bathing in the summer.

In response to this, in recent years, devices have been introduced to regulate such river pollution, and various methods for treating polluted water have come into use.

A typical treatment method is to make a dilute aqueous solution of a polyacrylamide-based polymer flocculant and mix it with muddy water to flocculate clay, silt, fine soil, etc. in the muddy water and form large particles (flocculate). ), a method of sedimentation is being implemented.

However, the method for using polyacrylamide-based polymer flocculants is to mix polyacrylamide powder with water.
．． 0.05 to 1.0%, and add 1 to 3 p of this to muddy water.
Since it is added in the pm range, a device for dissolving the powder,
A storage tank that temporarily stores the dissolved solution requires various equipment such as a drip tank and drip device to maintain a constant water pressure for addition, and also requires a constant supervisor to manage the dissolution and addition of powder. This required a large amount of expense.

The applicant of this application has discovered that the above-mentioned solution method has the above-mentioned drawbacks, and as a way to eliminate these drawbacks, the present applicant uses a flocculant in the form of a solid, which has not been considered at all in the past.
With the expectation that it would be possible to omit the various equipment and personnel required in the past with a relatively simple device that would allow the daily required amount to be poured into muddy water at once, the
No. 10081 proposed a solid flocculant based on solidification of polyethylene oxide.

However, unlike polyethylene oxide, polyacrylamide, which is most widely used as a flocculant for muddy water, cannot be solidified by heat treatment, so I had given up on research at the time of the previous application, but this time I suddenly had an idea. The present invention was achieved based on the discovery that polyacrylamide can also be solidified by adding a small amount of water.

That is, in the present invention, a thin layer of polyacrylamide powder used as a coagulant is made to absorb approximately twice the same amount of water, thereby imparting some adhesive force to the particle surface of the polyacrylamide powder. This is a method for producing a polyacrylamide solid flocculant, which is made by allowing particles to adhere to each other.

The present invention will be explained in more detail by referring to examples.

Polyacrylamide for muddy water treatment includes nonionic, anionic, and cationic types, and these come in several types, including polyacrylamide itself and slightly modified polyacrylamide through partial hydrolysis. Commercially available products include Sunfloc (trade name, manufactured by Sanyo Chemical Industries, Ltd.) and Aronfloc (trade name, manufactured by Toagosei Chemical Co., Ltd.).
There are Konan Flock (trade name, manufactured by Konan Kagaku Kogyo), Sunpoly (trade name, manufactured by Sankyo Kasei Kogyo), and so on.

To solidify these polyacrylamide-based flocculant powders, polyacrylamide powder is placed in a flat-bottomed container to a thickness of 2 to 5 mm, and water is gently added to the spread.

Pouring methods include using a tool such as a watering pot, or gradually pouring water from the lower layer of the container to allow the polyacrylamide powder particles to absorb the water.

The amount of water required to solidify polyacrylamide is preferably about 1 to 2 times the weight of polyacrylamide.

As described above, when water is added to polyacrylamide powder, the polyacrylamide powder particles absorb water, generate adhesive force, and adhere to each other.

This is cut into a certain size to complete the solid flocculant.

If there is an excess of water during this solidification, the adhesive force may be too strong and the cut pieces may stick together even if cut as described above. In this case, coat the cut pieces with new polyacrylamide powder. It becomes a solid flocculant that does not adhere to each other.

In order to use the solid flocculant of the present invention configured as described above, the flow rate of the muddy river or the like to be treated and the gold mud ratio are investigated in advance, and the soil particles in the muddy water are flocculated and settled. Measure in advance the amount of flocculant added to make the transparency 80% or more (measured with a photoelectric colorimeter 600 mμ),
Predict the amount of flocculant for the flow rate of muddy water.

In order to treat the muddy water that has been investigated in advance in this way, to settle soil particles, etc., and to flow clear water downstream, the muddy water is pumped up with a pump, etc., and the discharge port of this pump is filled with a solid flocculant. A cylindrical dissolving device is connected to the slurry, and the muddy water is passed through the cylindrical dissolving device, brought into contact with a solid flocculant, and then discharged into a river via a sedimentation basin or the like, if necessary.

The method of using the solid flocculant of the present invention and its effects will now be explained in more detail.

The solid flocculant of the present invention is manufactured as described above and installed in a cylindrical melting device after taking measures to prevent spillage, such as filling a mesh pipe capsule, and then pumped up by a water pump. introducing the muddy water into the dissolving device and bringing it into contact with the solid flocculant of the present invention filled in the dissolving device,
The solid flocculant is gradually dissolved by the sweeping force of the muddy water.

The flocculant thus dissolved comes into contact with soil particles in the muddy water in the flow path downstream of the dissolving device and in the sedimentation basin.
Due to the action of the flocculant, soil particles are flocculated to form so-called flocs, which settle in a settling pond.

Therefore, the supernatant liquid flowing out from the sedimentation tank has a predetermined (transparency of 80
%) The water becomes clear and transparent and is discharged into rivers, etc.

The amount of solid flocculant to be introduced into the dissolving device is determined based on the amount predicted in the preliminary test described above, taking into account the total flow rate within a certain working time and adding a slight amount of loss.

The composition of the solid flocculant of the present invention is that polyethylene oxide or the like may be mixed with the above-mentioned polyacrylamide or a partial hydrolyzate of polyacrylamide in order to improve the transparency of the supernatant liquid, and in this case, polyacrylamide is also used. It shall be included in the system flocculant.

Since the present invention is a polyacrylamide solid flocculant as described above, it exhibits superior effects compared to conventional flocculants used in the form of a solution.

That is, as mentioned above, the solid flocculant of the present invention can flocculate and settle soil particles in muddy water by simply adding the required amount of flocculant into an extremely simple device, so it is possible to flocculate soil particles etc. in muddy water, instead of the solution form that was conventionally used. Unlike flocculants, there is no need for complicated equipment such as special powder dissolving equipment, dissolved liquid storage equipment, drip tanks, drip equipment, etc., and the equipment and equipment are extremely low cost, especially operating costs. The muddy water treatment method using the flocculant of the present invention is advantageous because it is an extremely simple operation that requires only the addition of a solid flocculant 15 to 30 minutes before the start of work, and a manager who operates and manages the equipment is not required. It is extremely economical compared to the conventional tti.

Claims (1)

[Claims] 1 Lay out a thin layer of polyacrylamide powder used as a flocculant, absorb about twice the same amount of water, and give the polyacrylamide powder particle surface some adhesive strength to make the particles stick to each other. A method for producing a polyacrylamide solid flocculant made by bonding together.