JP4637657B2 - Additives excellent in decolorization function for livestock treated water and decolorization method of livestock treated water using the same - Google Patents

Description

The present invention relates to an additive having an excellent decolorization function used for decolorization treatment of water obtained by septic tank treatment of livestock treatment water or the like discharged from a livestock house and the like, and a decolorization method of livestock treatment water using the same .

  The present applicant has not only been able to quickly decolorize the raw water treated with livestock in the septic tank with simple equipment, but also purified the treated water to a level that can be reused as cleaning liquid. A patent application (Patent Document 1) has been filed for an invention that aims to present a decoloring treatment method. This invention is made by adding a ferric sulfate and a nonionic or anionic organic flocculant to a filtrate obtained by treating raw water as livestock treated water in a septic tank, and stirring and reacting it to separate it into a solid and a liquid component. It is a decolorization processing method which consists of the process of removing a component. Preferably, in the above treatment, it is preferable to add an amount of polyferric sulfate to a concentration of 500 to 2,000 ppm, and a nonionic or anionic organic flocculant to add an amount of 10 ppm or more. In this decolorization method for livestock processing water, it was suggested that the waste paper and / or activated carbon addition is preferably performed in the first stage reaction in which polyferric sulfate is added in the above treatment.

  In the method for decolorizing livestock treated water of this invention, ferric sulfate and nonionic or anionic systems are added to the filtrate obtained by treating raw water in a septic tank, and the mixture is stirred and reacted, whereby the brown suspension in the treated water is treated. Since the fine fibrous substance as the main component can be aggregated and separated, it has an excellent decoloring effect. In addition, since the fine fibrous material, which is a cause of clogging of the filter, can be removed, there is no troublesome problem in the subsequent processing. Further, in the method for decolorizing a filtrate of the present invention, by performing waste paper and / or activated carbon addition in the first stage reaction in which polyferric sulfate is added in the above treatment, not only the dehydration effect is improved, but also the above-described minute amount is obtained. Fibrous materials can be adsorbed and removed to provide further decolorization effects.

The present inventor has developed a system for carrying out the above-described decolorization method for livestock treated water, and has previously applied for a patent (Patent Document 2) for a “solid-liquid separation system having a decolorization function for septic tank treated water”. This solid-liquid separation system equipped with the function of decolorizing treatment water in the septic tank is a means for adding ferric polysulfate to the filtrate aerated in the septic tank, and introducing a liquid in which polyferric sulfate is added to the reaction. A first reaction tank to be treated, a means for adding an organic flocculant in the course of transferring the liquid treated in the first reaction tank to the second reaction tank, and a solid treated by the reaction in the second reaction tank. And means for supplying the slurry separated into liquid components to a lower position on the upstream side of the screen conveyor that is continuously driven in an inclined arrangement, and means for solid-liquid separation by continuously squeezing the slurry being conveyed by the conveyor A preferred form of the means for adding ferric polysulfate to the filtrate is a cylindrical tank partitioned by a partition plate, and the polysulfuric acid in the lower upstream section. Iron added It was presented which additives such as activated carbon is added above the downstream section.
Japanese Patent Application No. 2004-206112 "Decolorization Method for Livestock Treated Water" filed July 13, 2004 Japanese Patent Application No. 2005-101987 "Solid-liquid separation system with decolorization function for septic tank water" Filing on March 31, 2005

The problem of the present invention is that in the system for carrying out the above-mentioned decolorization method for livestock treated water, an optimum material as an additive to be added when polyferric sulfate is added to the filtrate, that is, a higher decolorization effect, Providing a material for firmly agglomerating the fine fibrous substance that is the main component of the brown suspension in water, and a material for neutralizing the strong acidity in water accompanying addition of polyferric sulfate , and It is to provide a method for decolorizing used livestock processing water .

Excellent additive decolorization function of the present invention, stock-raising treatment water to cause agglutination of the first stage by stirring by adding ferric polysulfate, by Rukoto organic flocculant added to the processing solution In the solid-liquid separation process that causes the second stage agglomeration reaction, it is mixed during the first stage agglomeration reaction , and consists of a mixture of activated carbon, lime and cotton-like waste paper fibers as the main components Was used.
The activated carbon used was a powdery dry type.
Furthermore, the raw material weight mixing ratio of the additive excellent in the decolorization function for livestock treated water of the present invention was 1.5 ± 30% lime and 2.25 ± 20% waste paper with respect to the activated carbon 1.
Further, the method for decolorizing livestock treatment water of the present invention is a step of collecting the supernatant of the livestock treatment solution and putting it in the first treatment tank, adding the ferric polysulfate and the additive excellent in the decolorization function and stirring the step. , Transporting the separated solid-liquid mixture to the second treatment tank, adding a nonionic (or anionic) organic flocculant and stirring, and separating and removing the separated solids by filtration It was.

The additive excellent in the decolorization function for livestock treated water of the present invention is a mixture of activated carbon, lime and waste paper as main components, and the activated carbon has a function of adsorbing suspensions in treated water, and lime is alkaline. The used paper has a function to make the flocs agglomerated solidly, and the used paper is treated by using a fiber that is cut into cotton. It can be mixed evenly in water and entangled with agglomerated suspended solids to form a firm floc. The activated carbon is used in a powdery dry type to widen the adsorption surface and evenly mixed in the treated water.
In the present invention, the material mixing ratio in the additive with excellent decolorization function for livestock treated water is 1.5 for lime with respect to activated carbon 1 and 2.25 for waste paper. Is an experimentally determined ratio, which is a wasteful mixing ratio and varies depending on the treated water. Therefore, the value is given a range to obtain an optimum mixing ratio. In particular, since the pH value of the treated water varies, the optimum value can be selected on a case-by-case basis, with the waste paper being ± 20% wide and the lime being ± 30%.
And the decolorization method of livestock processing water of the present invention is based on the first reaction step with ferric sulfate and the second reaction step of adding and stirring the nonionic (or anionic) organic flocculant, During the first reaction, an additive excellent in decoloring function according to the present invention was added and stirred, so that the activated carbon suspension was adsorbed, the lime neutralized function, and the aggregated float of waste paper The function of making the substance a firm flock can be effectively exhibited.

First, the basic flow of the process in which the additive excellent in the decoloring function for septic tank treated water of the present invention is used will be described with reference to FIG. The treatment liquid that has been aerated in the septic tank and decomposed by the activated sludge microorganisms is suspended in brown. In step 1, the supernatant of this treatment solution is collected and placed in the first treatment tank, and ferric sulfate is added and stirred to cause the first stage agglomeration reaction to separate the solid (sludge) and liquid components. However, in this case, an additive having an excellent decolorization function for the septic tank treated water according to the present invention is added. The solid-liquid mixture separated in step 2 is transferred to the second treatment tank, and a nonionic (or anionic) organic flocculant is added and stirred to cause the second stage of agglomeration reaction to produce floc (solid content) and liquid. Separate into components. The solid content (sludge) separated in step 3 is separated and removed by filtration using a screen (filter cloth). By the above simple treatment, the filtrate is decolorized epoch-making and purified to a highly transparent liquid.

The addition of an additive excellent in the decolorization function performed in Step 1 was not performed, and the treatment was performed by simply changing the type and addition amount of activated carbon when the decolorization treatment was performed using only polyferric sulfate and an organic flocculant. A decoloring function comparison test with the case was performed. For the activated carbon, dry activated carbon (SAI-11) and WET 50% are prepared, and the supernatant liquid backed up in the septic tank at K Farm is used as raw water, and the amount of ferric sulfate for 1500PPM and the amount of activated carbon are added respectively. Change the first stage reaction, then add NP780 (trade name of Daianitrix Co., Ltd.) as a nonionic organic flocculant to perform the second stage reaction, observe the state of the floc formed and filter Then, solid-liquid separation was performed, and the degree of decolorization was comparatively observed using the obtained filtrate as a sample. The results are shown in Table 1.
Sample No. 1 was obtained by performing decoloring treatment using only ferric sulfate and an organic flocculant without using activated carbon, Sample Nos. 2 to 4 were those using dry activated carbon (SAI-11), Sample No. 5 7 to 7 are those using WET 50% activated carbon, and sample number 8 is the raw water itself. As for floc formation, any of the additions of activated carbon did not show much difference. Each of the filtrates was taken in a beaker and compared, and the results were as shown in FIG. Since Figure 2 is not a color photograph, it is a little difficult to see, but the raw water of Sample No. 8 is suspended in brown, and the sample treated without using the activated carbon of Sample No. 1 is less transparent than the other samples using activated carbon. You can see that. Observing the results of the actual beaker test, it was found that the greater the amount of activated carbon added, the greater the decoloring effect. Naturally, dry type activated carbon had a higher decolorizing function than WET type activated carbon. Based on this result, in the present invention, a dry type activated carbon is adopted. The amount of activated carbon added here is 300 ml of raw water.

Activated carbon has the function of adsorbing the suspension of fine brown fibrous objects in the treated water and the odor of the treated water, but the waste paper is entangled with agglomerated suspended solid matter (SS) and has a solid floc. From the knowledge that this can be done, the present invention has come to the idea of adding waste paper or the like to the activated carbon. In addition to waste paper, a decoloration treatment was also performed by adding dehydrated cake (paper sludge) and incinerated ash, and the optimum added substances were tested. And raw water aeration treated supernatant in the septic tank in K farm, the ferric polysulfate and the 1500PPM min and activated carbon and the raw water 1 m ³ per 0.33 kg, the raw water 1 m ³ per paper 1kg those of Sample No. 1 Sample No. 2 2kg of dehydrated cake with 50% moisture content, 10kg of dehydrated cake with 50% moisture content, 2kg of incinerated ash for sample number 4, and 20kg of incinerated ash for sample number 5 Then, the reaction of the first stage is carried out, and then the second stage reaction is carried out by adding 15 PPM of AP410C (trade name of Daianitrix Co., Ltd.) as an organic flocculant of weak anion, and the state of the floc formed is observed. Then, filtration and solid-liquid separation were performed to verify dehydration, and the degree of decolorization was comparatively observed using the obtained filtrate as a sample. In addition, the amount and turbidity of BOD, COD and SS in the filtrate were measured. The results are shown in Table 2.
In this table, the specific gravity converted value (mg / l) of the amount of polyiron added was calculated as a specific gravity of 1.45. In the table, ◎ means excellent, ○ means good, and Δ means good.
When the dehydrated cake was added, floc nuclei were formed and the dehydration property was good, but the BOD value in the treated water tended to increase although it was within the regulation value. Moreover, the solid content after dehydration increased. In addition, when incinerated ash was added, dehydration was improved by increasing the amount of input, and the BOD value in the treated water was also decreasing, which was good. However, the incinerated ash tends to float upward in the treated water. It was difficult to react, the fine SS was liable to float, and the SS value showed an increasing tendency, and the solid content after dehydration increased. Based on these results, it was determined that used paper with good floc formation, decolorization function, dewaterability, residual BOD, COD, SS value and turbidity was the optimal material.

The additive excellent in the decolorization function for the septic tank treated water according to the present invention used in this way was obtained by adding lime used for adjusting the pH value and mixing activated carbon, lime and waste paper as raw materials. Used paper fiber is made of cotton fiber because of its high compatibility with treated water. This cotton-like waste paper is obtained by finely cutting waste paper such as newspapers, magazines, and telephone books, and pulverizing and stirring it with a machine such as a hammer mill or a pill mill to form a fiber. Activated carbon adsorbs the suspension of brown fine fibrous bodies in the treated water and the odor of the treated water. And although used paper is thrown into the treated water and stirred, it is mixed evenly by using a cotton-like one, and the aggregated suspended matter (SS) can be entangled into a firm flock. The suspended matter aggregated only by the flocculant is in a soft and soft solid state, and even if this is separated by a screen, solid-liquid separation cannot be performed cleanly. A solid flock is formed by entwining this SS with cotton-like waste paper.

Here, when waste paper is used as an additive material with excellent decolorization function for septic tank treated water, it is often printed matter such as newspapers, magazines, or telephone books, so environmental pollutants are included in materials such as ink. Because there is a concern that it is, it was analyzed. The results are shown in Table 3. Additives with excellent decolorization function for septic tank treated water of the present invention are components dissolved in the liquid in the course of treatment, which are finally contained in the solid-liquid separated waste water and adhered to the paper fiber Will be contained in the separated solid as a floc. However, as can be seen from this table, waste paper materials are not detected as environmental pollutants and are safe materials, so both discharged wastewater and sludge processed into fertilizer etc. There is no risk of environmental problems.

Examples of the additive excellent in the decolorizing function for septic tank treated water according to the present invention and specific usage forms thereof are shown below. In this example, an additive with excellent decolorization function was prepared by mixing 1.5 by weight of lime with respect to the amount of powdered activated carbon 1 and 2.25 by weight of waste paper using cotton-like waste paper fiber. When the first stage agglomeration reaction was carried out by adding polyferric sulfate to the filtrate prepared and treated in the septic tank, an additive excellent in this decolorization function was added .
It used for the solid-liquid separation system provided with the decoloring processing function of the septic tank treated water introduced as one embodiment in the previous patent document 2. As shown in FIG. 3, the first reaction tank 1 and the second reaction tank 2 are installed on the base 10, and the first reaction tank 1 has blades fixed on the inner peripheral side surface in the center. A rotating blade is installed in the section, and the liquid stored by the interaction of both blades has a function of stirring. The second reaction tank 2 is also provided with a rotating blade at the center. The first reaction tank 1 is provided with a path 3 through which the filtrate of the septic tank is introduced via a small acrylic tank 6 and a path 4 through which the raw water from the raw urine tank is introduced through the flow rate adjusting tank 9. The route 4 is provided with an addition port 11 to which a cationic flocculant is added. As shown in FIG. 4, the acrylic small tank 6 has a transparent cylindrical shape and is partitioned vertically by a partition plate 7. In this example, a partition plate 7 having a hole in the center is used. In addition, an inlet 61 into which the filtrate of the septic tank is introduced at the bottom portion is provided with a pipe 62 that penetrates the partition plate 7 from above and to which ferric sulfate is added. A pipe 63 into which an additive having an excellent decoloring function according to the present invention is placed is arranged in an upper section of the partition plate 7, and a flowing fluid is added thereto. In addition, the fluid treated in the first reaction tank 1 is sent to the second reaction tank 2 via the flow path 5, and an anion or nonionic flocculant addition port 12 and a cationic flocculant addition port are in the middle. 13 are arranged. Further, an agglomerated slurry supply rod 8 is provided for supplying the agglomerated slurry floating from the upper part of the second reaction tank 2 to the upstream end of the screen conveyor.

In the decolorization treatment, filtered water from the septic tank is supplied to the acrylic small tank 6, polyferric sulfate and an additive excellent in the decolorization function according to the present invention are added, and the first reaction tank 1 is stirred. Then, the reaction is carried out following the first stage. Subsequently, the fluid is sent to the second reaction tank 2 via the flow path 5, and an anionic or nonionic organic flocculant is introduced from the addition port 12 of the flocculant on the way, and the second reaction tank 2 A second stage agglutination reaction takes place. Then, the agglomerated slurry in which the agglomerated solid content is floating is supplied to the upstream end portion of the screen conveyor 20 via the agglomerated slurry supply rod 8. The screen conveyor 20 is wound around an endless belt between a drive roll 21 and a driven roll 22 provided at both ends, and the screen conveyor 20 is rotationally driven by a motor (not shown). The screen conveyor is installed in an inclined state so that the downstream side is slightly higher than the upstream side. And the water | moisture content is dropped from the mesh | network of the screen conveyor 20, and the remaining solid content is squeezed by the pressing part which consists of the preliminary pressing roller 23 and the pressing roller 24, and is dehydrated.

Two examples of the results of treating the septic tank treated water discharged from an actual farm using the additive excellent in the decolorizing function of the present invention in the above aggregation process are shown. Table 4 shows data obtained by using the supernatant of the sedimentation tank in the treatment facility of K farm as a sample, and Table 5 shows data obtained by using the supernatant of the sedimentation tank in the treatment facility of I farm as a sample.
In the septic tank facility at K Farm, BOD, which was contained in an amount of 33 mg per liter of the sedimentation tank supernatant, was removed to 2.1 mg in the dehydrated water, 100 mg for COD to 34 mg, and SS Was reduced from 58 mg to 7 mg.
In the septic tank facility of Farm I, BOD, which was contained in an amount of 160 mg per liter of the sedimentation tank supernatant, was removed to 12 mg in the dehydrated water, 180 mg for COD was reduced to 25 mg, and the nitrogen content was 480 mg was reduced to 360 mg and for phosphorus content 6.3 mg was reduced to 0.43 mg. There is a difference between the BOD and COD contained in the supernatant of the sedimentation tank of the septic tank, but this is a pig excreta treatment at K farm, whereas I farm is a cattle excreta treatment, The difference in the degree of solid-liquid separation before septic tank treatment has a great influence. In any case, BOD has decreased to 10% or less, and SS has also decreased to more than a dozen percent. It was also demonstrated that the nitrogen removal function is not high, but the phosphorus removal function is excellent.

It is a flowchart explaining the decoloring process process using the additive excellent in the decoloring function of this invention. It is a photograph which shows the result of having tested the kind and usage-amount of the activated carbon used for the additive excellent in the decoloring function based on this invention. It is a figure explaining the specific example of the decoloring processing system in which the additive excellent in the decoloring function based on this invention is used. It is a figure explaining the example of the small tank in which the additive excellent in the decoloring function which concerns on this invention is used in a decoloring processing system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st reaction tank 2 2nd reaction tank 3, 4, 5 Flow path 6 Small tank made from acrylic
61 Filtrate inlet of septic tank 62 Polyferric sulfate input pipe
63 Depigmenting agent input pipe 7 Partition plate 8 Aggregated slurry supply tank 9 Flow rate adjustment tank
10 base 11, 12, 13 Organic flocculant addition port
20 Screen cover 21 Drive roll
22 Follower roll 23 Pre-squeeze roller
24 pressing roller

Claims (4)

To cause agglutination of the first stage by stirring by adding ferric polysulfate livestock treatment water, the treatment liquid organic coagulant was added solid-liquid cause aggregation reaction of the second stage by Rukoto separation In the process , an additive which is mixed during the first-stage agglomeration reaction and has an excellent decolorizing function, which is a mixture of activated carbon, lime and cotton-like waste paper fibers as main components.   2. The additive having an excellent decoloring function according to claim 1, wherein the activated carbon is of a powdery dry type.   The additive with excellent decolorization function according to claim 1 or 2, wherein the weight ratio of the raw material is 1.5 ± 30% lime and 2.25 ± 20% waste paper with respect to the activated carbon 1.   The supernatant of the livestock treatment solution is collected and placed in the first treatment tank, and the step of adding and stirring the polyferric sulfate and the additive excellent in decoloring function according to any one of claims 1 to 3 is performed. Transfer the liquid mixture to the second treatment tank, add a nonionic (or anionic) organic flocculant and stir, decolorize livestock treated water by filtering and separating the separated solids Method.