JPH0398602A - Manufacture of water treatment agent and granulated material for water treatment - Google Patents

Abstract

PURPOSE:To obtain water treatment agent for combined water treatment aimed at deodorizing effects and reduction of BOD, SV and moisture content by forming a granulated material based on dry distillate of brown coal of specific grain diameter. CONSTITUTION:One kind or more than two kinds of converter slug, blast furnace slug, fly ash, activated coal, bone coal, zeolite, mine waste, tuff-lava, loam are mixed, depending on necessity, at 40wt.% or less, based on dry distillate of brown coal with 210mum or less of grain diameter. Then 5 to 35 pts.wt. of purified water is added to 100 pts.wt. of the mixture, and this mixture is molded under pressure to obtain granulated forms with 0.2 to 0.5kgf/cm<2> of tensile strength and 15mm or less of grain diameter. The obnoxious odor of treated water can be eliminated and BOD, SV and moisture content can be decreased, with the use of this granulated material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water treatment agent for treating treated water such as sewage and a method for producing granules for water treatment.

Problems to be solved by conventional techniques and inventions Conventional water treatment agents for treating treated water such as sewage and sewage include, for example, polymer flocculants, sulfuric acid clay, ferric chloride, slaked lime, etc. Alternatively, it is known that they are mixed as necessary.

However, since each of them has only a single action and effect, it was not possible to expect a complex action and effect.

On the other hand, coals such as bituminous coal and anthracite cannot be expected to be effective in removing the bad odor generated from sludge.
Since there is a problem with dispersibility in water, there is no track record of its use as a treatment agent.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a water treatment agent and a method for producing granules for water treatment, which can achieve a deodorizing effect and reduce, for example, BOD, SV, water content, etc., and perform complex water treatment. With the goal.

Means for Solving the Problems> The water treatment agent according to the present invention for achieving the above object is characterized in that it is made of carbonized lignite and has a particle size of 210 μm or less; The composition of the method for producing granules for treatment is carbonized brown coal, or if necessary, one or more of converter slivers, blast furnace slivers, fly ash, activated carbon, bone charcoal, zeolite, shirasu, tuff, and Kanto loam. 5 to 35 parts of fresh water per 100 parts by weight of the mixture
After adding and mixing parts by weight, pressure molding is performed to obtain a tensile strength of 0.2 to 0. It is characterized by obtaining a granulated molded product of 5 kgf/cd.

The present invention will be explained in detail below.

In the present invention, the carbonized product of lignite (hereinafter referred to as "char") refers to lignite at a temperature of 300 to 800°C, preferably 500 to 700°C.
The particle size is 210 μm or less, preferably 88 μm, with a sieve residue of 10
% or less.

Table 1 below shows the analytical values for "brown coal" and "char".

Unlike general activated carbon, this char has a unique structure and a different pore distribution, so it has a high deodorizing effect and can further reduce BOD, SV, water content, etc.

In addition, the main component of char is one or two types of subcomponents such as converter ash, blast furnace ash, fly ash, activated carbon, bone charcoal, zeolite, whitebait, tuff, Kanto loam, etc., as necessary. The above components are mixed in an amount of 40% by weight or less to improve deodorizing performance and the like.

By using a water treatment agent obtained by adding the above-mentioned char and subcomponents as necessary, and mixing or passing it through the treatment process, the bad odor generated by treated water such as sewage can be significantly removed. I can do it. Further, it is possible to improve the transparency of treated water, reduce the BOD value and the sv value of generated sludge, and reduce the water content of dehydrated sludge.

In addition, the granulated material made by granulating char and subcomponents to a particle size of 15 m or less can be used as a deodorizing device to deodorize various parts of the treatment plant, and then can be reused as a water treatment agent.
The deodorizing effect can be utilized more effectively.

The granulation method according to the present invention is as follows.

The method for producing granulated coal using the carbonized brown coal (maximum particle size of 2 cm or less) described above is based on the method of producing granulated coal using carbonized coal (maximum particle size of 2 mm or less) using char or, if necessary, converter sinter, blast furnace sliver, fly ash, activated carbon, bone charcoal, zeolite, shirasu, 5 to 3 parts of fresh water per 100 parts by weight of a mixture of one or more types of tough and Kanto loam
After adding 5 parts by weight and mixing uniformly, the compressive force on the pressurized surface was adjusted to 100 kgf/cd to 10
The granules are granulated in the range of 0.00 kgf/c+/, dried, and the moisture content of the granulated product is maintained at about 0 to 30 parts by weight, preferably about 0 to 15 parts by weight, and the tensile strength is maintained at about 0.00 to 15 parts by weight. 2 kgf/cd ~0.
A granulated molded body having a weight of 5 kgf/c+j is obtained.

Here, the tensile strength of the granulated compact is 0.2 to 0.5 kgf.
/cd is specified when the tensile strength is 0.2kgf/a
This is because if it is less than I1, it will turn into powder during handling during transportation, storage, etc., increasing the risk of dust generation and explosion, or causing bridging phenomenon in the container, making it difficult to extract. In addition, if the tensile strength exceeds 0.5 kgf/cIl, the dispersibility in water will deteriorate rapidly, and the various functions of pulverized coal will be impaired. This is because you will not be able to perform.

The pressure force on the pressure surface should be 100 to 1000 kgf/c.
Although d varies depending on the particle size distribution of pulverized coal,
Tensile strength of the above granulated coal (0.2 to 0.5 kgf/ai
This is because the compressive force is such that r).

By the method of the present invention, pulverized coal is granulated by simply humidifying the pulverized coal without using a binder at the same time, and the granulated coal has sufficient hardness to keep pulverization within a safe range due to the impact of pulverization during transportation and storage. When using this method, granulated charcoal can be obtained which has the property of being easily and uniformly dispersed and suspended in water.

Test examples showing the effects of the present invention will be described below.

Test Example 1 A carbonized product obtained by carbonizing lignite at 600 to 650°C for 8 hours.
Composition I was prepared using an 8 μm sieve with a residual content of 10% or less, and various tests shown in Table 2 were conducted.

Composition Isoz amount % to converter furnace 15% by weight and water content 3
% of Kanto loam is added to form a mixture of 5% by weight and the composition ■
The test was conducted in the same manner.

15% by weight of fly ash and 5% by weight of Kanto loam with a water content of 3% are added to 80% by weight of Composition I to form a mixture,
A similar test was conducted using composition (2).

For comparison, similar tests were conducted using bituminous coal, anthracite coal, and beet.

The test results are shown in Table 2.

Table 2 As shown in Table 2, Composition I-I has sedimentation properties, deodorization properties,
It was found that B was significantly superior to conventional water treatment agents such as bituminous coal in terms of dehydration properties, water quality of separated water, and dispersibility in water.

Test Example 2 Dispersibility test of granulated coal using char 15 parts by weight of water was added to 100 parts of char (88 μm sieve residue of 10% or less) and the mixture was homogenized using a compression granulator. Granulation by changing the diameter (φ15m, length 11.
5 na to 13.1 + m), and the tensile strength and dispersibility of the granules were determined.

The results are shown in Table 3.

Table 3 Note 11O: 4 points ○: 3 points: 2 Δ: 1 ×: 0 Total of each evaluation point Test example 3 Dispersibility test of granulated coal made by adding and mixing bituminous coal to char - 80 parts by weight To a mixture of 20 parts by weight of bituminous coal (88 μm sieve residue of 10% or less), add 1 part of water.
5 parts by weight was added and the homogenized product was granulated by changing the pressure using a compression granulator (φ15 m, length 1 1.5 yes ~ 1
3. 1 m) Similarly to Test Example 2, the tensile strength and dispersibility of the granules were determined.

The results are shown in Table 4.

Table 4 Next, a preferred embodiment of the present invention will be described.

Practical Example In order to clarify the effect of adding the water treatment agent of the present invention in the sewage treatment process, sewage collected at a sewage treatment plant (B
OD 150■/l) and return sludge (SS concentration 70
A batch water treatment test was conducted using 00■/j).

A schematic diagram of the experimental apparatus is shown in FIG. In the figure, 1 is a feed tank in which sewage to be treated is stored.

2 is a feed pump which pumps up the treated sewage and guides it through a valve 3 to each of six transparent vinyl chloride pipes 4 each having an inner diameter of 200 cm and a length of 3500 cm.

5 is a drain valve which draws out the sludge separated in each of the transparent vinyl chloride tubes 4. 6 is a compressor, and the compressed air pressurized here is released from the bottom of each transparent vinyl chloride tube 4 in the form of bubbles from a diffuser bulb 7. 8 is a flow meter, and 9 is a check valve, which is placed in the middle of the line connecting the compressor 6 and the diffuser bulb 7.

To draw out the water separated from the transparent vinyl chloride pipe, for example, a number of valves are installed at predetermined intervals on the side of the transparent vinyl chloride pipe, and if necessary, the specified valves are opened to take out the liquid inside. Make it.

In this experimental device, the feed tank 1, the bomb 2, and the compressor 6 are common, and six transparent vinyl chloride pipes 4 are used each, so that six experiments can be performed at the same time.

Using the above equipment, (1) sand settling process test, (
2) Initial settling process test, (3) Aeration process test,
(4) Perform each experiment of final sedimentation process test and {5} dehydration process test, and based on the results, determine the BOD of treated water,
I was looking for depth.

The methods for each of these tests were as follows.

(1) Sand sedimentation process test Fill the feed tank 1 with the above sewage, open the valve 3 and operate the feed pump 2, and supply the sewage into the transparent PVC pipe, which is located at a height of 3000 m. An operation of overflowing from the outlet 10 and circulating it back into the feed tank 21 through a return pipe (not shown) is performed.
This was carried out for 10 minutes in advance to obtain a uniform suspension. Thereafter, the valve 3 was closed and the mixture was allowed to stand for 20 minutes.

In this state, the supernatant liquid inside the tube was collected from each unillustrated sampling port of the transparent vinyl chloride w4, and this was used as the settling tank treated water.

The amount of treated water collected was 901 each. On the other hand, the drain valves 5 connected to the lower parts of the transparent vinyl chloride pipes 4 are opened, and the vinyl vl4
The slurry at the bottom of the tank was extracted and used as the sediment treatment residue.

(2) Initial sedimentation process The treated sand water was poured into each vinyl chloride pipe 4 and allowed to stand for 2 hours. Thereafter, the supernatant liquid inside the transparent vinyl chloride pipe 4 was collected from a collection port (not shown), and this was used as the initial precipitation treated water. The amount of treated water collected was 851 in each tube.

On the other hand, the drain valves 5 connected to the lower parts of the transparent vinyl chloride pipes 4 were opened to draw out the slurry from the lower parts of the vinyl pipes 4, and this was used as the initial precipitation treatment residue.

(3) Add 30% by volume of the return sludge collected at the M City treatment plant to the initial settling water of the aeration process, and pump this onto each of transparent vinyl chloride 1! Until I reached the exit.

Thereafter, the compressor 6 was operated to send air from the diffuser bulbs 7 provided at the bottom of each transparent vinyl chloride Iw4 so that the dissolved oxygen in the tubes was 3 to 5 cm/I, and aeration was carried out for 4 hours.

(4) Final sedimentation process After aeration in the aeration process, valve 3 was closed and left as it was for 2 hours. This supernatant liquid was collected and used as final sedimentation treated water.

i! on the bottom of the PVC pipe! ! The compressed slurry was drawn out by opening the valve, and was used as a final sedimentation treatment residue.

(5) Dehydration process The treatment residues produced in each process are mixed, and the cationic polymer flocculant Kayafloc C-
566 (Yakon Kayaku ■ trade name) was added at a concentration of 200 mg/j, and a dehydration test was conducted using a belt press type filtration test device.

The performance of the water treatment agent according to this example and bituminous coal, anthracite, etc. was tested using the above experimental method.

For comparison, the particle size of each water treatment agent was unified to 88 μm, with a sieve residue of 10% or less.

Namely, 100% carbonized distillate of brown coal (Example ■), 80% by weight carbonized brown coal, 15% weight of converter slag, 5% weight of Kanto loam (Example ■), 80% carbonized distillate of brown coal, fly ash. 15% by weight, Kanto loam 5% by weight (Example ■),
100% bituminous coal (Comparative Example 1), 100% anthracite (Comparative Example 1), and 100% beet (Comparative Example -) were added to the sewage to be treated at 401 lIg/I at the same time as the settling process started. After supplying so that
It was supplied at 40 mg/j at the same time as the start of aeration in the aeration process.

In the above series of experiments, the BOD of supernatant water after the final settling process (final settling water) {il! The odor concentration of the gas sampled from each transparent vinyl chloride pipe in each process was measured using the three-point comparison odor bag method (Tokyo Metropolitan Pollution Prevention Ordinance Notification No. 238).

The results are shown in Table 5.

Table 5 4 Effects of the Invention> As described above in detail with the test examples and examples, the present invention has the effect of being able to remove the bad odor of the water to be treated and reduce the BOD, SV, and water content. Qin.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the experimental apparatus used in this example. In the drawing, 1 is the feed tank, 2 is a feed pump, 3 is a valve, 4 is vinyl chloride official. 5 is the drain valve, 6 is the compressor 7 is a diffuser balloon, 8 is a flow meter, 9 is a check valve.

Claims (1)

[Scope of Claims] 1) A water treatment agent comprising carbonized brown coal and having a particle size of 210 μm or less. 2) The water treatment agent according to claim 1, optionally containing 40% by weight of one or more of converter slag, blast furnace slag, fly ash, activated carbon, bone charcoal, zeolite, whitebait, tuff, and Kanto loam. % or less of water treatment agents. 3) The water treatment agent according to claim 1 or 2, characterized in that the particle size of the granules is 15 mm or less. 4) 100 parts by weight of carbonized brown coal, or a mixture of one or more of converter ash, blast furnace ash, fly ash, activated carbon, bone charcoal, zeolite, shirasu, tuff, and Kanto loam as required. On the other hand, after adding and mixing 5 to 35 parts by weight of fresh water, pressure molding is performed, and the tensile strength is 0.2 to 0.
．． A method for producing a granulated product for water treatment, characterized by obtaining a granulated molded product of 5 kgf/cm^2.