JP2003245658A - Method for treating sludge water containing residual chemical substance, agricultural chemical and heavy metals using superfine powder of carbonized chaff and flocculation sedimentation agent, and how to use the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for treating compound sludge water containing a residual chemical substance, agricultural chemical and heavy metals which can simplify a treatment process and treat a large quantity of sludge water in a short time by applying a technique based on a different principle from a conventional treatment method. <P>SOLUTION: Sludge water 4 containing the agricultural chemical and heavy metals is put in an agitation tank 1, superfine powder 5 of the carbonized chaff is added thereto, and this mixture is left for a fixed time. The sludge water treated with the powder 5 is moved to an agitation and flocculation tank 2, and sludge in the sludge water, the heavy metals adsorbed to the sludge and the superfine powder of the carbonized chaff to which residual chemical substance and agricultural chemical are adsorbed are flocculated with a flocculation sedimentation agent 6. The flocculated sludge water is moved to the sedimentation and separation tank 3, and separation of purified water 19 from sludge 20 is conducted. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sludge water using an ultrafine powder of carbonized chaff that adsorbs and removes and decomposes residual chemical substances and pesticides and a flocculating settling agent that flocculates heavy metals. The present invention relates to a sludge water treatment system at the site of soil pollution.

[0002]

2. Description of the Related Art In the prior art, sludge water that is complexly contaminated with residual chemical substances, pesticides and heavy metals is treated with heavy metals and residual chemical substances and pesticides after reducing the turbidity. ing. Turbidity is generally reduced by natural sedimentation, sand filtration, or a coagulating sedimentation agent. For heavy metals, various methods such as redox, thermal decomposition, filtration and adsorption are applied. Regarding the treatment of residual chemical substances and pesticides, not only activated carbon but also aggregate, charcoal,
It is treated with water-soluble organic bases containing amino groups such as agarose and amino acids, which are chemically synthesized chemicals as adsorbents and sprayed with ionic resin. For complex sludge water containing residual chemicals, pesticides and heavy metals generated during civil engineering work on soil-contaminated land, agricultural land, or during the soil cleaning process, a method to easily treat large amounts of polluted water on site is proposed. It has not been.

[0003]

In the prior art, the reduction of turbidity, the separation of heavy metals, and the adsorption of residual chemicals and pesticides are carried out in separate independent steps, so that sludge water that has been contaminated with complex substances can be easily processed. Moreover, it is difficult to collectively process in a short time. In addition, with the technology for adsorbing residual chemical substances and pesticides using activated carbon or the like, there are cases where residual chemical substances and pesticides cannot be removed below the standard value even though odors and colors can be removed. The problem to be solved by the present invention is to remove residual chemical substances, pesticides, and sludge water containing heavy metals in a simple process,
It is an invention of a treatment method that is surely performed in a short time.By applying these treatment methods, it is possible to treat a large amount of waste liquid from a factory, sludge water generated in farmland or contaminated soil land, etc. in the field. .

[0004]

[Means for Solving the Problems] As a means for solving the problems, a treatment method using an ultrafine powder of carbonized chaff and a coagulating sedimentation agent was developed. This treatment method completely reverses the treatment procedure of reducing turbidity, which is conventionally done → separating and adsorbing heavy metals, residual chemicals and pesticides. In other words, the residual chemical substances, pesticides, odors, and colors are adsorbed by putting ultrafine powder of carbonized chaff into the target treated water and leaving it for a certain period of time. After that, a coagulating sedimentation agent is added to purify the sludge water by simultaneously coagulating and sedimenting the mud components floating in the sludge water, the heavy metals adsorbed thereto and the ultrafine powder of carbonized chaff. The fine powder of carbonized chaff to be used is obtained by crushing and solidifying chaff and then carbonizing it in a carbonizing furnace, and then pulverizing it into ultrafine powder to form a fine powder of 1 to 50 microns. The silica and carbon contained in the carbonized chaff are bound together like fibrous jungle gyms, and innumerable particles have their activation amplified among the ultrafine particles, resulting in the adsorption and removal of residual chemicals and pesticides. It has the characteristic that decomposition is performed in a short time. Further, as the flocculating / precipitating agent, one that can effectively adsorb heavy metals and rapidly flocculate / precipitate suspended ultrafine particles is used. By this. Sludge water containing residual chemical substances, pesticides and heavy metals, which was complicated by the conventional method, can be easily treated. In addition, it is possible to treat water-soluble ink waste liquid, etc. from the factory, and it has a wide range of applications.

An ultrafine powder of carbonized chaff for adsorbing and removing / separating residual chemical substances applied by the applicant to this system (Japanese Patent Application No. 11-253422) and a powder aggregating hydrophobic agent (Japanese Patent Application No. 2000-71283). The efficiency of purification can be increased by combining with).

[0006] By utilizing this system for purification of sludge water containing residual chemical substances, pesticides and heavy metals generated in civil engineering works in soil-contaminated areas or in the soil cleaning process in soil-contaminated areas, It is possible to easily treat polluted water and wash soil.

[0007]

DETAILED DESCRIPTION OF THE INVENTION

[First Embodiment] Table 1 shows an example of pesticide-contaminated water treated with an ultrafine powder of carbonized chaff and a coagulating sedimentation agent. The target water to be treated is artificially adjusted Sumithion (ME
(P: herbicide) 0.1 mg / l aqueous solution, ultrafine powder of carbonized chaff is added stepwise so as to have a turbidity of 0.1 g / l to 25 g / l, and after standing for 30 minutes, powder A coagulation hydrophobizing agent was added for coagulation sedimentation treatment. According to this, an ultrafine powder of carbonized chaff and 0.1 g / l and a standing time of 30 minutes showed a high removal rate of 99.5%. The time required for the coagulation sedimentation and the sludge separation treatment was 10 minutes.

[0008]

[Second Embodiment] A micron-class ultrafine particle (Japanese Patent Application No. 11-253422) obtained by the applicant of the present application, which is obtained by refining a carbide of chaff using an ultrafine particle crusher, and a powder aggregating hydrophobic agent (special This is an example in which the application No. 2000-71283) is applied to excavated mud generated in a soil-polluted area. In addition to heavy metals, odor and color were recognized in the drilling mud that was the target of treatment. As a result of treating these with an ultrafine powder of carbonized chaff and a powder aggregating hydrophobizing agent, good results shown in Table 2 were obtained. Regarding the treatment method, first, carbonized chaff and ultrafine powder were added to the water to be treated, followed by stirring for 20 minutes. Then, a powder aggregating hydrophobic agent was added, and after stirring for 10 minutes, purified water and sludge were separated.

[0009]

[Third Embodiment] FIG. 1 shows an automatic treatment system for sludge water containing residual chemical substances, pesticides and heavy metals generated in civil engineering works on soil-contaminated land, agricultural land, or in the soil cleaning process. Is. First, the sludge water 4 to be treated is put in the stirring tank 1, an appropriate amount of the ultrafine powder 5 of carbonized chaff is added, and then stirring is performed for a fixed time. Next, the ultrafine powder mixed water 17 of carbonized chaff is transferred to the agitation / aggregation tank 2, and the aggregating / precipitating agent 7 is added, followed by agitation for a certain period of time. The treated water 11 with the flocculating / precipitating agent confirmed to have the flocculating effect is separated into purified water 19 and sludge 20 in the precipitation / separation tank 3. Stirring is performed by the stirrer drive 7 and the stirrer 8 above the tanks 1 and 2. The amount of treated water is adjusted by checking the quality of the purified water discharged from the purified water outlet 16 and using the treated water adjusting valve 10. On the other hand, the water to be treated is sent by the pump 9 provided between the tanks 1, 2, 2 and 3. The sludge is discharged from the lower ends of the tanks 2 and 3 by the sludge discharge pipe 14. The sludge extraction valve 11 adjusts the discharge amount. When the amount of water to be treated is small and continuous treatment is not necessary, the tanks 1, 2 and 3 shown in FIG. 1 or the tanks 1 and 2 are shown as one tank. As the carbonized chaff and ultrafine powder and the flocculating precipitant, all of those having an effect of removing the residual chemical substances in the treated water, pesticides and heavy metals by adsorption can be applied. This system can also be applied to the treatment of wastewater and contaminated water generated in factories and food factories.

[0010]

INDUSTRIAL APPLICABILITY The present invention is effective in treating complex contaminated sludge water containing residual chemical substances, pesticides, and heavy metals because it is easy to treat and does not require complicated steps. In particular, it is suitable for construction of agricultural land and soil polluted land, and treatment of sludge water that is generated in large quantities during the soil washing process. It can also be applied to waste liquids from paint factories and food factories. The carbonized chaff fine powder used in this treatment method is produced as a by-product of rice farmers, and if this treatment method is widely used, not only effective use of chaff but also significant The processing cost can be reduced.

[Brief description of drawings]

FIG. 1 shows a soil polluted area, showing a third embodiment of the present invention.
FIG. 1 is a conceptual diagram of an automatic treatment system for sludge water containing residual chemical substances, pesticides, and heavy metals generated in civil engineering work on agricultural land or in the soil cleaning process.

[Explanation of symbols]

1 stirring tank 2 stirring / aggregation tank 3 sedimentation / separation tank 4 Sludge water to be treated 5 Ultra fine powder of carbonized chaff 6 Coagulating sedimentation agent 7 stirring drive 8 stirrer 9 pumps 10 Treated water adjustment valve 11 Sludge removal valve 12 water pipes 13 connected pipes 14 sludge discharge pipe 15 Purified water drainage pipe 16 Purified water outlet 17 Ultra fine powder mixed water of carbonized chaff 18 Mixed water with coagulating sedimentation agent 19 purified water 20 sludge

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 11/00 C02F 11/00 C 11/14 11/14 EF term (reference) 4D015 BA11 BA23 BB08 BB12 CA01 CA11 CA17 DA01 DA02 DA35 EA32 FA01 FA22 4D024 AA04 AB04 AB16 BA03 BB01 BC04 CA01 CA06 DB12 DB21 4D059 AA03 BE60 BE65 BJ01 BK30 DA02 DA51 DA70 4G066 AA04B AC02A BA20 BA36 CA21 CA45 DA08 DA15 FA22

Claims (3)

[Claims] 1. A method for treating sludge water containing residual chemical substances, pesticides and heavy metals, using an ultrafine powder of carbonized chaff and a coagulating sedimentation agent. 2. Solidification and volume reduction while crushing chaff,
The solid matter is carbonized in a carbonization furnace, and is further micronized by an ultrafine particle crusher (Japanese Patent Application No.
-253422) and a silica gel natural mineral as a flocculating and precipitating agent 10 to 60% by weight, soluble aluminum rim to 40% by weight, alkali metal salt 5 to 30% by weight, alkaline earth metal compound 5 to 40% by weight as a flocculating main component. On the other hand, the sludge water treatment method according to claim 1, wherein a powder aggregating hydrophobizing agent (Japanese Patent Application No. 2000-71283) containing 1 to 10% by weight of an organic coagulant as an auxiliary agent is used. 3. A treatment system using the treatment method according to claim 1 for sludge water containing residual chemical substances, pesticides and heavy metals generated in civil engineering works of soil-contaminated land, agricultural land, or in the soil cleaning process. .