JP4043124B2 - Purification device - Google Patents

Description

【００２８】
【表２】

【００２９】
表１は、磁性体凝集剤２の注入量を１日処理水量に対して５００ｐｐｍに設定した場合に、有機塩素化合物（トリクロロエチレン）の濃度変化を示し、表２は、磁性体凝集剤２の注入量を１日処理水量に対して２００ｐｐｍに設定した場合に、有機塩素化合物（トリクロロエチレン）の濃度変化を示す。表１に示すように、磁性体凝集剤２の注入量を１日処理水量に対して５００ｐｐｍに設定した場合には、循環回数を増加することによって、従来のシステムでは効率よく十分に除去できなかった有機塩素化合物を９０％除去することができた。また、表２に示すように、磁性体凝集剤２の注入量を１日処理水量に対して２００ｐｐｍに設定した場合には、循環回数を増加することによって、有機塩素化合物を７０％除去することができた。
【００３０】
本発明は、以上説明した実施形態に限定するものではなく、種々の変形又は変更が可能であって、これらも本発明の範囲内である。例えば、本発明の実施形態では、汚染地下水を例に挙げて説明したが、地下水以外の汚染水についても本発明を適用することができる。
【００３１】
【発明の効果】
以上説明したように、本発明によれば、磁性体凝集剤がＦｅ_２ Ｏ_３ 、Ａｌ_２ Ｏ_３ 及びＣａＣＯ_３ の各微粉末とＦｅ_３ Ｏ_４ 又はＮｄの磁性体微粉末とを含むので、有機塩素化合物、重金属類、ＴＮ及びＴＰなどを効率的に除去することができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態に係る浄化装置の構成図である。
【図２】本発明の第１実施形態に係る浄化装置の凝集反応ろ過器の構成図である。
【符号の説明】
１ 浄化装置
２ 磁性体凝集剤
３ 充填ろ材
１０ フィーダ
１１ ミキサ
１２ 凝集反応ろ過器
１２ａ 入口側ストレーナ
１２ｂ 出口側ストレーナ
１３ 貯留槽
１４，１７ ポンプ
１５ ノズル
２０ ブロワ
３０ 発泡樹脂層
３１ アンスラサイト層
３２ セラミックス層
３３ ろ過砂層
３４ 支持砂利層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a purification device that removes harmful substances dissolved in soil, groundwater, and the like.
[0002]
[Prior art]
Conventionally, contaminated soil is purified by soil suction or circulating pumping, non-in situ treatment methods that excavate and heat contaminated soil by excavating the contaminated soil zone, and remove microorganisms. Methods for remediating contaminated soil to be used are known.
[0003]
[Problems to be solved by the invention]
However, in the purification method using soil suction or circulating pumping treatment, the treatment efficiency decreases when the concentration of pollutants decreases to some extent. In particular, in the circulating pumping treatment, activated carbon or ion exchange resin used as an adsorbent is pyrolyzed. There was a need. Also, the incineration pyrolysis method has a high initial cost and can only be applied to highly contaminated soil, and requires an external energy source, which increases the running cost and may cause secondary pollution. It was. Furthermore, in the purification method using microorganisms, the safety of new substances produced by the microorganisms has not been elucidated, and the effects of nutrients and various compounds added to the microorganisms on the underground environment are unclear. there were.
[0004]
The subject of this invention is providing the purification apparatus which can remove a harmful substance efficiently.
[0005]
[Means for Solving the Problems]
The present invention solves the above problems by the following means.
That is, the invention of claim 1 includes a stirrer that mixes magnetic substance flocculant and contaminated water, a feeder that supplies the magnetic flocculant in a predetermined amount to the stirrer, and mixed water in the stirrer. A first agglomeration reaction filter for inflowing and filtering the mixed water; a storage tank for storing treated water that has passed through the agglomeration reaction filter; and a first tank for supplying treated water in the storage tank to the contaminated soil layer. A second pump for supplying contaminated water that has passed through the contaminated soil layer to the stirrer , the agglomeration reaction filter from the inlet side toward the outlet side, the foamed resin layer, the anthracite layer A ceramic layer, a sand layer, and a supporting gravel layer, and the magnetic flocculant contains fine powders of Fe ₂ O ₃ , Al ₂ O ₃ and CaCO ₃ and fine magnetic powders of Fe ₃ O ₄ or Nd. It is the purification apparatus characterized by this.
[0007]
According to a second aspect of the invention, the purification device according to claim 1, comprising a blower for supplying air to the inlet side from the outlet side of the aggregation reaction strainer, the first pump is of the agglutination hemofilter The purification apparatus is characterized in that the treated water in the storage tank is supplied from the outlet side to the inlet side, and the inside of the agglomeration reaction filter is washed with the treated water.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a purification device according to the first embodiment of the present invention, and FIG. 2 is a configuration diagram of an agglomeration reaction filter of the purification device according to the first embodiment of the present invention.
[0009]
The purification device 1 is a device that removes harmful substances dissolved in soil or groundwater. As shown in FIG. 1, a feeder 10, a mixer 11, a coagulation reaction filter 12, a storage tank 13, and a pump 14, 17, nozzle 15, pipes 16, 18, 19, 21, 22, 23, 26, 27, blower 20, dewatering tanks 24, 25, and valves V <b> 1 to V <b> 5.
[0010]
The magnetic flocculant 2 is mainly composed of fine powders of Fe ₂ O ₃ (ferric trioxide), Al ₂ O ₃ and CaCO ₃ , and Fe ₃ O ₄ (which functions as a magnetic substance in the flocculant). It is a mixture of fine magnetic powder of triiron tetroxide) or Nd (neodymium). This magnetic flocculant 2 can be expected to be re-agglomerated using the agglomerated sludge attached to the packed filter medium 3 in the agglomeration reaction filter 12 in an apatite form as seed sludge.
[0011]
The feeder 10 is a device that supplies a predetermined amount of the magnetic substance flocculant 2 into the mixer 11, and includes a hopper 10a that houses the magnetic substance flocculant 2 and a valve 10b that opens and closes the bottom of the hopper 10a. Yes. The mixer 11 is a stirring cyclone mixer that mixes the magnetic flocculant 2 and the contaminated treated water, and is provided below the feeder 10.
[0012]
The agglomeration reaction filter 12 is a device that receives the mixed water in the mixer 11 and performs a coagulation filtration process on the mixed water. As shown in FIG. 2, the agglomeration reaction filter 12 includes a packed filter medium 3, an inlet-side strainer 12a into which the mixed water in the mixer 11 flows, and an outlet-side strainer 12b into which treated water that has passed through the packed filter medium 3 flows. And. In addition, as shown in FIG. 2, the packed filter medium 3 includes a foamed resin layer 30, an anthracite layer 31, a ceramic layer 32, in order from the inlet side (upper part) into which the mixed water flows into the outlet side (bottom part). It consists of a filtration sand layer 33 and a supporting gravel layer 34.
[0013]
The storage tank 13 shown in FIG. 1 is a water tank that stores the treated water that has passed through the agglomeration reaction filter 12, and the pump 14 pumps up the treated water in the storage tank 13, and the nozzle 15 and the agglomeration reaction filter 12. It supplies to the outlet side strainer 12b. The nozzle 15 is a device that pressurizes the treated water supplied by the pump 14 and injects it into the contaminated soil layer. The pipe 16 is a conduit through which the treated water flows, and the pump 14 and the nozzle 15 are connected to each other. Connecting.
[0014]
The pump 17 is a device that supplies the contaminated treated water to the agglomeration reaction filter 12 in order to circulate the contaminated treated water (groundwater) that has passed through the A layer, the B layer, and the C layer. This is a conduit through which contaminated treated water flows, and this pump 17, mixer 11 and agglomeration reaction filter 12 are connected. The pipe 19 is a conduit through which treated water that has passed through the agglomeration reaction filter 12 flows, and connects the outlet side strainer 12 b of the agglomeration reaction filter 12 and the storage tank 13.
[0015]
The blower 20 is a device that feeds air to the outlet side strainer 12b of the agglomeration reaction filter 12, and the pipe 21 connects the blower 20 and the outlet side strainer 12b, which are pipes through which air flows. The pipe 22 is a pipe through which treated water for washing the inside of the agglomeration reaction filter 12 passes, branches from the pipe 16 and connects the pump 14 and the outlet side strainer 12b.
[0016]
The pipe 23 is a pipeline through which the drainage sludge discharged from the inlet side strainer 12a passes, and connects the inlet side strainer 12a and the dewatering tanks 24, 25. This is a device for dehydration by vacuum dehydration. The pipe 26 is a pipe for discharging the dehydrated cake dehydrated by the dehydration tanks 24 and 25 to the outside of the system, and the pipe 27 is a pipe through which the treated water discharged from the dehydration tanks 24 and 25 passes. Yes, the dehydration tanks 24 and 25 and the storage tank 13 are connected.
[0017]
The valve V1 is an inflow valve that is opened when the mixed water in the mixer 11 is supplied into the agglomeration reaction filter 12, and the valve V2 is used to store the treated water after filtering the mixed water in the storage tank 13. It is an outflow valve that is opened when discharging to the factory. The valve V3 is a backwash valve that is opened when the treated water in the storage tank 13 is supplied into the agglomeration reaction filter 12, and the valve V4 discharges the sludge that has been washed with the treated water. It is a drain valve. Further, the valve V5 is an air washing valve that is opened when air is supplied into the coagulation reaction filter 12, and the valve V6 is an air washing that is opened when air is supplied into the coagulation reaction filter 12. It is a valve.
[0018]
Next, operation | movement of the purification apparatus which concerns on 1st Embodiment of this invention is demonstrated.
When the contaminated treated water is sent into the mixer 11 through the pipe 18 by the pump 17, the valve 10b is opened and the magnetic flocculant is introduced into the mixer 11 from the hopper 10a. As a result, the contaminated groundwater and the magnetic substance flocculant 2 are mixed in the mixer 11 to promote flock formation. When the valve V1 is opened and the mixed water in the mixer 11 flows into the flocculation reaction filter 12 from the inlet side strainer 12a, the flocculation reaction filter 12 performs the flocculation filtration process.
[0019]
When the mixed water flows into the agglomeration reaction filter 12, the mixed water is subjected to ion bond reaction filtration, and the magnetic substance flocculant 2 mixed in the mixed water causes reaggregation (apatite action). Then, a re-aggregation flock film (magnetic flock film) mainly composed of Fe ₂ O ₃ in the magnetic substance flocculant 2 is formed around the particles in the foamed resin layer 30, the anthracite layer 31 and the ceramic layer 32. The For this reason, it becomes an organochlorine compound reaction reactor, and fine particles are adsorbed by ionic bonds due to electroionic adsorption force, and harmful substances are filtered and removed, and it becomes a bioreactor and biological reaction filtration process. . As a result, organochlorine compounds (trichloroethylene, tetrachloroethylene), heavy metals, TN, TP, and the like are efficiently removed.
[0020]
Next, when the valve V <b> 2 is opened, the treated water treated by the aggregation reaction filter 12 is discharged into the storage tank 13 through the pipe 19. And the treated water in this storage tank 13 is supplied to the nozzle 15 through the piping 16 by the pump 14, and is inject | poured in the soil of purification object by this nozzle 15. Contaminated treated water containing harmful substances that have passed through the A, B, and C layers in the soil is supplied into the mixer 11 through the pipe 18 by the pump 17.
[0021]
When suspended substances and excess sludge containing harmful substances increase in the filled filter medium 3, the filled filter medium 3 is blocked and the filtration resistance increases. In this case, when the valve V5 is opened and the blower 20 ejects air from the outlet side strainer 12b through the pipe 21, the filled filter medium 3 is loosened due to the rise and expansion of the bubbles. Thereafter, the valves V3 and V4 are opened, and the treated water in the storage tank 13 is supplied to the outlet side strainer 12b through the pipe 22 by the pump 14, and the inside of the aggregation reaction filter 12 is washed. Sludge and the like generated by washing are discharged to the dehydration tanks 24 and 25 through the pipe 23 and dehydrated by the natural dehydration by the dehydration tanks 24 and 25. Then, the dewatered cake is discharged out of the system through the pipe 26 and stably treated, and the dewatered separated water (treated water) is discharged into the storage tank 13 through the pipe 27 and then returned to the soil by the pump 14. Is done.
[0022]
The purification device according to the first embodiment of the present invention has the effects described below.
(1) In the first embodiment of the present invention, the magnetic flocculant 2 and the contaminated treated water are separated by the filled filter medium 3 including the foamed resin layer 30, the anthracite layer 31, the ceramic layer 32, the sand layer 33, and the supporting gravel layer 34. The mixed water consisting of is coagulated and filtered. As a result, not only organochlorine compounds but also heavy metals can remove harmful substances dissolved in soil and groundwater in order to produce magnetic components and aggregated compounds. Moreover, since each particle | grain in the foamed resin layer 30, the anthracite layer 31, and the ceramic layer 32 has a larger particle size than the conventional activated carbon, the pressure rise in the aggregation reaction filter 12 can be suppressed. Furthermore, the aggregated floc sludge captured by the packed filter medium 3 is treated as excess sludge, and at this time, it acts as a dehydrating aid.
[0023]
(2) In the first embodiment of the present invention, the magnetic substance coagulant 2 causes an apatite action, and the magnetic substance coagulant 2 is formed around the particles in the foamed resin layer 30, the anthracite layer 31 and the ceramic layer 32. A magnetic floc film is formed. As a result, since the apatite film is maintained for a certain period of time, it is not necessary to always add the magnetic substance flocculant 2 into the mixer 11. For example, it is sufficient to intermittently supply the magnetic material flocculant 2 once or twice a day. Therefore, economic efficiency can be improved. In addition, since the cohesive bond floc forms a large and hard floc, the number of backwashes can be reduced, and sludge can be easily dehydrated.
[0024]
(3) In 1st Embodiment of this invention, while storing the treated water which passed the aggregation reaction filter 12 in the storage tank 13, while supplying this treated water to a contaminated soil layer with the pump 14, this contaminated soil layer The contaminated treated water that has passed through is supplied into the mixer 11 by a pump 17. For this purpose, organic chlorine compounds that have spread in the underground environment (in the soil) can be purified on-site without excavating the contaminated soil, and contaminated soil can be removed by circulating the contaminated groundwater. Can be purified.
[0025]
(4) In 1st Embodiment of this invention, after the blower 20 supplies air to the inlet side strainer 12a from the outlet side strainer 12b, the pump 14 supplies the treated water in the storage tank 13, and agglomeration reaction filtration The inside of the vessel 12 is washed. For this reason, it is not necessary to reprocess the filled filter medium 3 by thermal decomposition or the like, and the purification system can be made compact.
[0026]
【Example】
Next, Table 1 and Table 2 show the purification results by the purification apparatus according to the first embodiment of the present invention.
[0027]
[Table 1]

[0028]
[Table 2]

[0029]
Table 1 shows the change in the concentration of the organic chlorine compound (trichloroethylene) when the injection amount of the magnetic substance flocculant 2 is set to 500 ppm with respect to the daily treated water amount. Table 2 shows the injection of the magnetic substance flocculant 2 When the amount is set to 200 ppm with respect to the daily treated water amount, the concentration change of the organic chlorine compound (trichloroethylene) is shown. As shown in Table 1, when the injection amount of the magnetic substance flocculant 2 is set to 500 ppm with respect to the daily treated water amount, the conventional system cannot be efficiently and sufficiently removed by increasing the number of circulations. 90% of the organic chlorinated compounds could be removed. Moreover, as shown in Table 2, when the injection amount of the magnetic substance flocculant 2 is set to 200 ppm with respect to the daily treatment water amount, 70% of the organic chlorine compounds are removed by increasing the number of circulations. I was able to.
[0030]
The present invention is not limited to the embodiments described above, and various modifications or changes are possible, and these are also within the scope of the present invention. For example, in the embodiment of the present invention, the contaminated groundwater has been described as an example, but the present invention can also be applied to contaminated water other than the groundwater.
[0031]
【The invention's effect】
As described above, according to the present invention, the magnetic flocculant contains each fine powder of Fe ₂ O ₃ , Al ₂ O ₃ and CaCO ₃ and fine magnetic powder of Fe ₃ O ₄ or Nd. Organochlorine compounds, heavy metals, TN and TP can be efficiently removed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a purification device according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram of an agglomeration reaction filter of the purification device according to the first embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Purifier 2 Magnetic substance flocculant 3 Filling filter medium 10 Feeder 11 Mixer 12 Aggregation reaction filter 12a Inlet side strainer 12b Outlet side strainer 13 Reservoir 14, 17 Pump 15 Nozzle 20 Blower 30 Foamed resin layer 31 Anthracite layer 32 Ceramics layer 33 Filtration sand layer 34 Supporting gravel layer

Claims (2)

A stirrer that mixes the magnetic substance flocculant and contaminated water, a feeder that supplies the magnetic substance flocculant to the stirrer in a predetermined amount , and the mixed water in the stirrer flows in. A flocculating reaction filter, a storage tank for storing treated water that has passed through the flocculating reaction filter , a first pump that supplies the treated water in the storage tank to the contaminated soil layer, and passing through the contaminated soil layer A second pump for supplying the contaminated water to the agitator ,
The agglomeration reaction filter includes a foamed resin layer, an anthracite layer, a ceramic layer, a sand layer, and a supporting gravel layer from the inlet side toward the outlet side,
The magnetic flocculant contains each fine powder of Fe ₂ O ₃ , Al ₂ O ₃ and CaCO ₃ and fine magnetic powder of Fe ₃ O ₄ or Nd,
Purification device characterized by. The purification apparatus according to claim 1 , further comprising a blower for supplying air from an outlet side to an inlet side of the aggregation reaction filter,
The first pump supplies the treated water in the storage tank from the outlet side to the inlet side of the aggregation reaction filter, and the inside of the aggregation reaction filter is washed with the treated water.
Purification device characterized by.

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