JP5216338B2 - Flocculant - Google Patents

Description

  The present invention is a coagulant that produces agglomeration and sedimentation in a small amount of wastewater from construction sites, domestic wastewater from factories and households using food materials, and is also compliant with environmental standards (BOD and COD). About.

  Traditionally, wastewater from construction sites and domestic wastewater from factories and households that use food materials are discharged into sewage, etc., regardless of environmental regulations, and depend on treatment by public institutions. Is the current situation.

  In particular, wastewater containing soil sludge from the construction site and domestic wastewater using food materials include wastewater from factories such as a noodle factory, rice tofu soup from households, wastewater containing potato starch and the like.

For this reason, various flocculants are commercially available, but depending on the type of drainage, the effect is not fully utilized and problems remain. For example, as in Patent Document 1.
JP 2005-118675 A

  Therefore, the present invention uses a flocculating agent in a smaller amount than a commercial product, and the flocculated sediment is a chemical substance that can be treated with garbage, and the effluent after treatment does not protect the global environment in accordance with environmental standards. It is to develop a flocculant that can be contemplated.

In order to achieve the object of the present invention, the following means are adopted.
The flocculant of this invention comprises 1 to 8 weight percent natural organic acid, 40 to 55 weight percent ammonium aluminum sulfate, 7 to 10 weight percent sodium aluminum sulfate, and 8 acrylamide polymers having an average molecular weight of 9 to 10 million. -15% by weight and sodium carbonate containing 20-25% by weight (pH adjustment value is set around 6.5-7.5).

  The natural organic acid used in the present invention is selected from citric acid, lactic acid, and iron lactate.

  According to the flocculant of the present invention, when used for wastewater in many fields, the fee for using the flocculant is less than that of conventional products, and the precipitate after aggregation is a chemical substance that can be treated with garbage, and the wastewater after treatment Also has excellent effects such as being in line with environmental standards (BOD and COD).

  Hereinafter, a preferred embodiment of the present invention will be described in detail. The natural organic acid is 1 to 3 weight percent, the ammonium aluminum sulfate is 40 to 55 weight percent, the sodium aluminum sulfate is 7 to 10 weight percent, and the average molecular weight is 9 million. Consists of flocculants characterized by containing 8-15 weight percent of -10 million acrylamide polymers and 20-25 weight percent of sodium carbonate (pH adjustment values set around 6.5-7.5) It is what is done.

Next, an embodiment of the present invention (flocculating agent A) will be described in detail.
Iron lactate 2.27
Ammonium sulfate 52.27
Sodium aluminum sulfate 9.09
Acrylamide polymer 13.64
Sodium carbonate 22.73
It is comprised from. [Unit is weight percent]

Further, another embodiment of the present invention (flocculating agent B) will be described in detail.
Citric acid 2.27
Ammonium sulfate 52.27
Sodium aluminum sulfate 9.09
Acrylamide polymer 13.64
Sodium carbonate 22.73
It is comprised from. [Unit is weight percent]

Next, explaining the results of soil sludge treatment,
The effects of the flocculant (A) of the present invention, the flocculant of the present invention (B), and a commercially available product were compared in a simulated soil sludge drainage 200 ml (hereinafter referred to as ml).
As a result, although 800 mg was required for the commercial product, if 200 mg was added to the flocculant (A) of the present invention and about 300 mg was added to the flocculant (B) of the present invention, agglomeration and precipitation occurred. As for the permeability of the supernatant aqueous solution, a better permeation result was obtained with the flocculant (A) of the present invention.

Next, explaining the results of wastewater treatment including starch,
As the efficacy test of the flocculant (A) of the present invention, which is a simulated treatment agent, 10 g / l of starch starch and 2
Trial production of 0g / l waste water, 200mg of the flocculant (A) of the present invention for each 200ml
And 300 mg was added and the aggregation state was observed.
As a result, good coagulation precipitation was observed under any conditions.
Then, as an ability test of the flocculant (A) of the present invention, when the addition amount with respect to 10 g / l of starch wastewater was determined, it was found that the minimum addition amount was 40 mg.

Next, explaining the results of the rice tofu drainage treatment,
The usual method of cutting was performed on 4 rice grains, and 200 ml of the waste water washed the second time was used.
As the flocculant, the flocculant (A) of the present invention and a commercial product were added to compare the efficacy.
As a result, in the flocculant (A) of the present invention, it was found that the aggregation started when 170 mg was added, and the aggregation was almost completed at 250 mg.
Eventually 500 mg may be needed. In addition, it was observed that floc aggregation aggregated at the upper part with time.
On the other hand, even when 800 mg was added in the commercial product, aggregation did not occur at all and it was in a white suspension state.

Furthermore, explaining the results of the udon soup drainage process,
Hot water juice obtained by dissolving 20 commercially available udon noodles in 3 l of hot water (90 ° C. or higher) was used in the experiment. The flocculant (A) of the present invention was used as a flocculant in 200 ml of a solution obtained by diluting 8 times, 4 times, and 2 times of the broth. Then 350 mg was added. The resulting floc aggregated starch, so that it was observed that the flocs aggregated in a floating state in the solution.

  Table 1 below shows the pH of wastewater in which soil sludge, starch starch and milk are dissolved, and wastewater in which rice tofu is treated using the flocculant (A) and flocculant (B) of the present invention. Show.

  As can be seen from Table 1, it can be seen that both the flocculant (A) and the flocculant (B) of the present invention are in the neutral range, which satisfies the preferable drainage standard. Therefore, it was found that there was no inferiority compared with the conventional flocculant.

Next, explaining the results of wastewater treatment of commercial milk,
After diluting 20 ml to 100 times of water with 10 ml of milk, the flocculant of the present invention (
A) 140 mg to 660 mg was added, and the aggregation state was observed. As a result, as a preferable condition for the treatment of milk drainage, flocs are aggregated by adding 240 to 600 mg of the flocculant (A) of the present invention after dilution by adding 30 to 70 times the amount of water. It was. Among them, the best treatment condition is a condition in which the flocculant (A) 240 mg is diluted with 50 times the amount of water, and floc aggregation progresses over time, and after floating in the solution, It was observed that the growth of flocs progressed and resulted in precipitation. [See Table 2]

  As can be seen from Table 2, it can be seen that the flocculant (A) of the present invention is in the neutral range even when any flocculant is added, thereby satisfying the preferable drainage standard. Therefore, it was found that there was no inferiority compared with the conventional flocculant.

Claims (2)

  1 to 3 weight percent natural organic acid, 40 to 55 weight percent ammonium aluminum sulfate, 7 to 10 weight percent sodium aluminum sulfate, 8 to 15 weight percent acrylamide polymer with an average molecular weight of 9 to 10 million, sodium carbonate Containing 20 to 25 weight percent (set as pH adjustment value around 6.5 to 7.5).   The flocculant according to claim 1, wherein the natural organic acid is selected from citric acid, lactic acid, and iron lactate.