1. A humidity sensor for detecting humidity in atmosphere comprising:
a humidity sensing element including a humidity sensitive film and a pair of first electrodes; and
a processing circuit, wherein:
the humidity sensitive film has a dielectric constant, which is variable in accordance with moisture adsorbed in the humidity sensitive film;
the pair of first electrodes detects capacitance of the humidity sensitive film and outputs a signal corresponding to the capacitance;
the processing circuit processes the signal from the pair of first electrodes;
the humidity sensor is a capacitive humidity sensor for detecting relative humidity based on the dielectric constant of the humidity sensitive film;
the humidity sensitive film is made of inorganic material having a plurality of fine pores for adsorbing the moisture in the atmosphere;
a diameter of the fine pores is set to be a predetermined diameter so that capillary tube aggregation phenomenon occurs at a predetermined relative humidity;
the capillary tube aggregation phenomenon is defined in such a manner that a plurality of water molecules in the atmosphere rapidly penetrate into the fine pores at the predetermined relative humidity;
the capacitance of the humidity sensitive film has a change rate with respect to the relative humidity; and
the change rate of the capacitance when the relative humidity in the atmosphere is higher than the predetermined relative humidity is larger than the change rate of the capacitance when the relative humidity in the atmosphere is lower than the predetermined relative humidity.
2. The sensor according to claim 1, wherein:
the diameter of the fine pores has a predetermined distribution around the predetermined diameter; and
the change rate of the capacitance becomes large as a width of the predetermined distribution becomes narrower.
3. The sensor according to claim 2, wherein:
the diameter of the fine pores is disposed in a range between 10 nanometers and 50 nanometers.
4. The sensor according to claim 3, wherein:
the predetermined distribution is disposed in a range between the predetermined diameter minus 1 nanometer and the predetermined diameter plus 1 nanometer.
5. The sensor according to claim 2, wherein:
the predetermined diameter is 10.5 nanometers; and
the predetermined distribution is disposed in a range between 10 nanometers and 11 nanometers.
6. The sensor according to claim 1, wherein:
the pair of first electrodes is covered with the humidity sensitive film; and
each first electrode has a comb-teeth shape.
7. The sensor according to claim 1, wherein:
the pair of first electrodes sandwiches the humidity sensitive film; and
each first electrode has a plate shape.
8. The sensor according to claim 1, further comprising:
a capacitive element having a pair of second electrodes, wherein the capacitive element has a capacitance, which is substantially constant with respect to the relative humidity;
the processing circuit includes a C-V converter circuit for converting a capacitance difference between the pair of second electrodes and the pair of first electrodes to a voltage; and
the humidity sensor detects the relative humidity based on the voltage output from the C-V converter circuit.
9. The sensor according to claim 8, wherein:
the processing circuit further includes an amplifier for amplifying the voltage from the C-V converter circuit with a predetermined amplification factor.
10. The sensor according to claim 8, wherein:
the processing circuit further includes a first amplifier and a second amplifier;
the first amplifier amplifies the voltage output from the C-V converter circuit with a first amplification factor so that the relative humidity higher than the predetermined relative humidity is detected; and
the second amplifier amplifies the voltage output from the C-V converter circuit with a second amplification factor so that the relative humidity lower than the predetermined relative humidity is detected.
11. The sensor according to claim 10, wherein:
the processing circuit further includes a switching circuit for switching between the first and second amplifiers based on the voltage output from the C-V converter circuit.
12. The sensor according to claim 1, further comprising:
a second humidity sensing element including a pair of third electrodes and a second humidity sensitive film, wherein
the second humidity sensitive film is made of organic polymer having a dielectric constant, which is variable in accordance with moisture adsorbed in the second humidity sensitive film;
the pair of third electrodes is covered with the second humidity sensitive film;
the processing circuit includes a C-V converter circuit for converting a capacitance difference between the pair of third electrodes and the pair of first electrodes to a voltage; and
the humidity sensor detects the relative humidity based on the voltage output from the C-V converter circuit.
13. The sensor according to claim 12, wherein:
the processing circuit further includes an amplifier for amplifying the voltage from the C-V converter circuit with a predetermined amplification factor.
14. The sensor according to claim 12, wherein:
the processing circuit further includes a first amplifier and a second amplifier;
the first amplifier amplifies the voltage output from the C-V converter circuit with a first amplification factor so that the relative humidity higher than the predetermined relative humidity is detected; and
the second amplifier amplifies the voltage output from the C-V converter circuit with a second amplification factor so that the relative humidity lower than the predetermined relative humidity is detected.
15. The sensor according to claim 14, wherein:
the processing circuit further includes a switching circuit for switching between the first and second amplifiers based on the voltage output from the C-V converter circuit.
16. A humidity sensor for detecting humidity in atmosphere comprising:
a humidity sensing element including a humidity sensitive part, a detection part and a support part; and
a processing circuit, wherein:
the humidity sensitive part is made of inorganic material having a plurality of fine pores for adsorbing the moisture in the atmosphere;
the support part supports the humidity sensitive part in such a manner that the humidity sensitive part is capable of vibrating;
the humidity sensitive part vibrates with a resonant frequency corresponding to weight of moisture adsorbed in the humidity sensitive part;
the resonant frequency of the humidity sensitive part is variable in accordance with the moisture adsorbed in the humidity sensitive part;
the detection part detects vibration of the humidity sensitive part and outputs a signal corresponding to an amplitude of vibration of the humidity sensitive part;
the processing circuit processes the signal from the detection part; and
the humidity sensor is a vibration type humidity sensor for detecting relative humidity based on the resonant frequency of the humidity sensitive part.
17. The sensor according to claim 16, wherein:
the humidity sensitive part is supported on the support part at only one portion.
18. A humidity sensor for detecting humidity in atmosphere comprising:
a first element including a humidity sensitive film and a pair of first comb-teeth electrodes;
a second element including a pair of second comb-teeth electrodes; and
a processing circuit including a switched capacitor circuit, a switching circuit and first and second amplifiers, wherein:
the humidity sensitive film has a dielectric constant, which is variable in accordance with moisture adsorbed in the humidity sensitive film;
the pair of first comb-teeth electrodes is covered with the humidity sensitive film so that the pair of first comb-teeth electrodes detects capacitance of the humidity sensitive film;
the pair of first comb-teeth electrodes outputs a signal corresponding to the capacitance;
the humidity sensitive film is made of inorganic material having a plurality of fine pores for adsorbing the moisture in the atmosphere;
a diameter of the fine pores has a predetermined distribution around a predetermined diameter;
the diameter of the fine pores is disposed in a range between 10 nanometers and 50 nanometers;
the predetermined distribution is disposed in a range between the predetermined diameter minus 1 nanometer and the predetermined diameter plus 1 nanometer;
the second element has a capacitance, which is substantially constant with respect to the moisture in the atmosphere;
the switched capacitor circuit converts a capacitance difference between the pair of second comb-teeth electrodes and the pair of first comb-teeth electrodes to a voltage;
the first amplifier amplifies the voltage output from the switched capacitor circuit with a first amplification factor so that relative humidity higher than a predetermined relative humidity is detected;
the second amplifier amplifies the voltage output from the switched capacitor circuit with a second amplification factor so that the relative humidity lower than the predetermined relative humidity is detected; and
the switching circuit switches between the first and second amplifiers based on the voltage output from the switched capacitor circuit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A polluted soil remediation apparatus comprising a treatment tank in which a pollutant degradable with light irradiation in the presence of chlorine is extracted as a gas containing the pollutant from a polluted soil and a mixed gas of the gas containing the pollutant and a chlorine-containing gas is irradiated with light to degrade the pollutant, wherein the apparatus comprises:
an aspirating means of aspirating the gas containing the pollutant from the polluted soil;
a chlorine-containing gas generation means of generating the chlorine-containing gas;
a mixing means of mixing the gas containing the pollutant extracted by the aspirating means and the chorine-containing gas generated by the chlorine-containing gas generation means to form the mixed gas;
a treatment region where the mixed gas is introduced; and
a light irradiation means of irradiating the treatment region with light to degrade the pollutant contained in the mixed gas; and
an exhaust means of exhausting a degradation-treated gas from the treatment region of the treatment tank.
2. The polluted soil remediation apparatus according to claim 1, wherein said aspirating means is comprised of a pit provided in said polluted soil and a vacuum pump for aspirating said gas containing the pollutant through the pit.
3. The polluted soil remediation apparatus according to claim 1 or 2, wherein said chlorine-containing gas generation means is comprised of a chlorine cylinder.
4. The polluted soil remediation apparatus according to claim 1, wherein said chlorine-containing gas generation means is a chlorine-containing air generation means bringing functional water capable of generating an air containing chlorine by being aired into contact with air.
5. The polluted soil remediation apparatus according to claim 4, wherein said chlorine-containing air generation means is comprised of a water tank, a means of generating said functional water, a means of introducing air into the water tank, a means of discharging said chlorine-containing air generated by the functional water, and a means of discharging the functional water used to generate the chlorine-containing air.
6. The polluted soil remediation apparatus according to claim 5, wherein said means of generating the functional water is comprised of a cistern, a means of providing water containing an electrolyte to the cistern, a pair of electrodes for applying a potential to the water containing the electrolyte in the cistern, and an electric source.
7. The polluted soil remediation apparatus according to claim 6, wherein said electrolyte is at least one selected from the group consisting of sodium chloride and potassium chloride.
8. The polluted soil remediation apparatus according to claim 5, wherein said means of generating the functional water is comprised of a cistern, a means of providing an aqueous solution of a hypochlorite to the cistern, and a means of providing an aqueous solution of an inorganic acid andor an organic acid to said cistern.
9. The polluted soil remediation apparatus according to claim 8, wherein said hypochlorite is at least one selected from the group consisting of sodium hypochiorite and potassium hypochlorite.
10. The polluted soil remediation apparatus according to claim 8 or 9, wherein said aqueous solution of hypochlorite contains an inorganic acid or an organic acid.
11. The polluted soil remediation apparatus according to claim 10, wherein said inorganic acid is at least one selected from the group consisting of hydrochloric acid, hydrofluoric acid, sulfuric acid, phosphoric acid and boric acid; and said organic acid is at least one selected from the group consisting of oxalic acid, acetic acid, formic acid, malic acid and citric acid.
12. The polluted soil remediation apparatus according to claim 4, wherein said chlorine-containing air generation means is comprised of a means of sending air to a surface of said functional water.
13. The polluted soil remediation apparatus according to claim 4, wherein said chlorine-containing air generation means is comprised of a cistern, a means of providing water containing an electrolyte to the cistern, a pair of electrodes for applying a potential to the water containing the electrolyte in the cistern, and an electric source.
14. The polluted soil remediation apparatus according to claim 13, wherein said electrolyte is at least one selected from the group consisting of sodium chloride and potassium chloride.
15. The polluted soil remediation apparatus according to claim 13 or 14, wherein said chlorine-containing air generation means is comprised of a means of sending air to a surface of said functional water.
16. The polluted soil remediation apparatus according to claim 15, wherein said functional water has been prepared at an anode side of said pair of electrodes; and said chlorine-containing air generation means is comprised of a means of introducing air in the vicinity of the anode side in said cistern.
17. The polluted soil remediation apparatus according to claim 4, wherein said chlorine-containing air generation means is comprised of a means bringing small droplets of said functional water into contact with air.
18. The polluted soil remediation apparatus according to claim 17, wherein said means of bringing the small droplets of said functional water into contact with air is a nozzle as a means of ejecting the functional water.
19. The polluted soil remediation apparatus according to claim 4, wherein said chlorine-containing air generation means is comprised of an aerating means of aerating said functional water with air.
20. The polluted soil remediation apparatus according to claim 19, wherein said aerating means is a bubbler.
21. The polluted soil remediation apparatus according to claim 4 which includes a means of introducing air supplied from the outside, which air does not includes any substance to be degraded, into said chlorine-containing air generation means.
22. The polluted soil remediation apparatus according to claim 21, wherein said functional water has properties of a hydrogen ion exponent (pH) of 1 to 4, and a dissolved chlorine concentration of 50 to 3000 mgl.
23. The polluted soil remediation apparatus according to claim 22, wherein said functional water has properties of a hydrogen ion exponent (pH) of 2 to 3, and a dissolved chlorine concentration of 100 to 1500 mgl.
24. The polluted soil remediation apparatus according to claim 4, wherein said gas containing pollutant aspirated from said polluted soil is introduced directly into said chlorine-containing air generation means.
25. The polluted soil remediation apparatus according to claim 24, wherein said functional water has properties of a hydrogen ion exponent (pH) of 1 to 4, and a dissolved chlorine concentration of 5 to 300 mgl.
26. The polluted soil remediation apparatus according to claim 4, wherein said functional water has properties of a hydrogen ion exponent (pH) of 4 to 10, and a dissolved chlorine concentration of 30 to 2000 mgl.
27. The polluted soil remediation apparatus according to claim 4 which includes a means of irradiating said functional water used for generating said chlorine-containing air and discharged with light.
28. The polluted soil remediation apparatus according to claim 4, wherein a region of said chlorine-containing air generation means in which region chlorine is generated comprises said treatment tank being one with said treatment region and exists in an lower portion of the treatment tank; and a volume of said functional water accounts for 5 to 30% of a capacity of said treatment tank.
29. The polluted soil remediation apparatus according to claim 1, wherein said treatment tank is in the shape of a bag a shape and capacity of which are variable.
30. The polluted soil remediation apparatus according to claim 29, wherein said bag-shaped treatment tank has an accordion-fold structure.
31. The polluted soil remediation apparatus according to claim 29 which includes a case covering said bag-shaped treatment tank.
32. The polluted soil remediation apparatus according to claim 31, wherein said light irradiation means is located in a region inside said case and outside said bag-shaped treatment tank.
33. The polluted soil remediation apparatus according to claim 1 which includes a means of sending at least one portion of said gas containing the pollutant aspirated from said polluted soil directly to said treatment region.
34. The polluted soil remediation apparatus according to claim 1, wherein chlorine radical is formed from chlorine contained in said mixed gas under said light irradiation.
35. The polluted soil remediation apparatus according to claim 1, wherein said light with which said mixed gas is irradiated comprises a light within a range of wavelengths of 300 to 500 nm.
36. The polluted soil remediation apparatus according to claim 35, wherein said light with which said mixed gas is irradiated comprises a light within a range of wavelengths of 350 to 450 nm.
37. The polluted soil remediation apparatus according to claim 1, wherein an irradiance of said light with which said mixed gas is irradiated is in the range of 10 Wcm2 to 10 mWcm2.
38. The polluted soil remediation apparatus according to any of claim 37, wherein said irradiance is in the range of 50 Wcm2 to 5 mWcm7.
39. The polluted soil remediation apparatus according to claim 1, wherein said pollutant is a organic chlorine compound.
40. The polluted soil remediation apparatus according to claim 39, wherein said organic chlorine compound is at least one of selected from the group consisting of chloroethylene, 1,1-dichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, trichloroethylene, 1,1,1-trichloroethane, tetrachloroethylene, chloromethane, dichloromethaxe and trichloromethane.
41. A pollutant degrading apparatus comprising a bag-shaped treatment tank, a shape and a capacity of which are variable, in which tank a mixed gas of a gas containing a pollutant degradable with light irradiation in the presence of chlorine and a chlorine-containing gas is irradiated with light to degrade the pollutant, wherein the apparatus comprises:
a chlorine-containing gas generation means of generating chlorine in a gas;
a mixing means of mixing the gas containing the pollutant and the chorine-containing gas generated by the chlorine-containing gas generation means to form the mixed gas;
a treatment region where the mixed gas is introduced;
a light irradiation means of irradiating the treatment region with light to degrade the pollutant contained in the mixed gas; and
an exhaust means of exhausting the degradation-treated gas from the treatment region of the treatment tank.
42. The pollutant degrading apparatus according to claim 41, wherein said bag-shaped treatment tank has an accordion-fold structure.
43. The pollutant degrading apparatus according to claim 41 which includes a case covering said bag-shaped treatment tank.
44. The pollutant degrading apparatus according to claim 43, wherein said light irradiation means is located in a region inside said case and outside said bag-shaped treatment tank.
45. The pollutant degrading apparatus according to claim 41, wherein said gas containing said pollutant is at least one selected from the group consisting of a gas aspirated from a polluted soil, a polluted exhaust gas, a polluted gas desorbed from an activated carbon and a polluted gas originating from an aeration of a polluted water.
46. A polluted soil remediation method wherein a pollutant degradable with light irradiation in the presence of chlorine is extracted as a gas containing the pollutant from a polluted soil and a mixed gas of the gas containing the pollutant and a chlorine-containing gas is irradiated with light to degrade the pollutant, which comprises the steps of:
aspirating the gas containing the pollutant from the polluted soil;
introducing the chlorine-containing gas;
mixing the gas containing the pollutant and the chorine-containing gas to form the mixed gas;
irradiating the mixed gas introduced in a treatment region of a treatment tank with light to degrade the pollutant contained in the mixed gas; and
exhausting the degradation-treated mixed gas from the treatment region.
47. The polluted soil remediation method according to claim 46, wherein a concentration of chlorine gas in said mixed gas is in the range of not less than 5 ppm to not more than 1000 ppm.
48. The polluted soil remediation method according to claim 47, wherein said concentration of chlorine gas in said mixed gas is in the range of not less than 20 ppm to not more than 500 ppm.
49. The polluted soil remediation method according to claim 46, wherein said aspirating Step is carried out by using a pit provided in said polluted soil and a vacuum pump for aspirating said gas containing the pollutant through the pit.
50. The polluted soil remediation method according to claim 46, wherein said introducing step of said chlorine-containing gas is carried out by using a chlorine cylinder.
51. The polluted soil remediation method according to claim 46, wherein said introducing step of said chlorine-containing gas is a step of generating an air containing chlorine which is comprised of bringing functional water capable of generating an air containing chlorine by being aired into contact with air.
52. The polluted soil remediation method according to claim 51, wherein said step of generating an air containing chlorine is comprised of the steps of:
generating said functional water;
providing said functional water to a water tank;
introducing air into the water tank;
discharging said chlorine-containing air generated by the functional water; and
discharging the functional water used to generate the chlorine-containing air.
53. The polluted soil remediation method according to claim 52, wherein said generating step of said functional water is comprised of the steps of:
providing water containing an electrolyte to a cistern; and
applying a potential to the water containing the electrolyte in the cistern.
54. The polluted soil remediation method according to claim 53, wherein said electrolyte is at least one selected from the group consisting of sodium chloride and potassium chloride.
55. The polluted soil remediation method according to claim 53, wherein said step of providing water containing an electrolyte to said cistern is comprised of the steps of:
providing an aqueous solution of a hypochlorite to said cistern; and
providing an aqueous solution of an inorganic acid andor an organic acid to said cistern.
56. The polluted soil remediation method according to claim 55, wherein said hypochlorite is at least one selected from the group consisting of sodium chloride and potassium chloride.
57. The polluted soil remediation method according to claim 55, Wherein said aqueous solution of hypochlorite contains an inorganic acid or an organic acid.
58. The polluted soil remediation method according to claim 57, wherein said inorganic acid is at least one selected from the group consisting of hydrochloric acid, hydrofluoric acid, sulfuric acid, phosphoric acid and boric acid; and said organic acid is at least one selected from the group consisting of oxalic acid, acetic acid, formic acid, malic acid and citric acid.
59. The polluted soil remediation method according to claim 51, wherein said step of generating an air containing chlorine is comprised of a step of sending air to a surface of said functional water.
60. The polluted soil remediation method according to claim 51, wherein said step of generating an air containing chlorine is comprised of the steps of:
providing water containing an electrolyte to a cistern; and
applying a potential to the water containing the electrolyte in the cistern with the aid of a pair of electrodes.
61. The polluted soil remediation method according to claim 60, wherein said electrolyte is at least one selected from the group consisting of sodium chloride and potassium chloride.
62. The polluted soil remediation method according to claim 61, wherein said step of generating an air containing chlorine is comprised of a step of sending air to a surface of said functional water.
63. The polluted soil remediation method according to claim 62, wherein said functional water has been prepared at an anode side of said pair of electrodes; and said step of generating an air containing chlorine is comprised of a step of introducing air in the vicinity of the anode side in said cistern.
64. The polluted soil remediation method according to claim 60, wherein said step of generating an air containing chlorine is comprised of a step of aerating said functional water with air.
65. The polluted soil remediation method according to claim 64, wherein said functional water has been prepared at an anode side of said pair of electrodes; and said step of generating an air containing chlorine is comprised of a step of introducing air in the vicinity of the anode side in said cistern.
66. The polluted soil remediation method according to claim 51, wherein said step of generating an air containing chlorine is comprised of a step of bringing small droplets of said functional water into contact with air.
67. The polluted soil remediation method according to claim 66, wherein said step of bringing small droplets of said functional water into contact with air is carried out by ejecting the functional water from a nozzle.
68. The polluted soil remediation method according to claim 51, wherein said step of generating an air containing chlorine is comprised of a step of aerating said functional water with air.
69. The polluted soil remediation method according to claim 68, wherein said step of aerating said functional water with air is carried out by using a bubbler.
70. The polluted soil remediation method according to claim 51, wherein said step of generating an air containing chlorine uses an air, which does not include any substance to be degraded provided from the outside.
71. The polluted soil remediation method according to claim 70, wherein said functional water has properties of a hydrogen ion exponent (pH) of 1 to 4, and a dissolved chlorine concentration of 50 to 3000 mgl.
72. The polluted soil remediation method according to claim 71, wherein said functional water has properties of a hydrogen ion exponent (pH) of 2 to 3, and a dissolved chlorine concentration of 100 to 1500 mgl.
73. The polluted soil remediation method according to claim 51, wherein said step of generating an air containing chlorine uses said gas containing the pollutant which has been aspirated from said polluted soil.
74. The polluted soil remediation method according to claim 73, wherein said functional water has properties of a hydrogen ion exponent (pH) of 1 to 4, and a is dissolved chlorine concentration of 5 to 300 mgl.
75. The polluted soil remediation method according to claim 51, wherein said functional water has properties of a hydrogen ion exponent (pH) of 4 to 10, and a dissolved chlorine concentration of 30 to 2000 mgl.
76. The polluted soil remediation method according to claim 51, which includes a step of irradiating said functional water used for generating said chlorine-containing air and discharged with light.
77. The polluted soil remediation method according to claim 51, wherein a chlorine-generating region in which said step of generating an air containing chlorine is carried out comprises said treatment tank being one with said treatment region in which region said step to degrade the pollutant is carried out and exists in an lower portion of the treatment tank; and a volume of said functional water accounts for 5 to 30% of a capacity of said treatment tank.
78. The polluted soil remediation method according to claim 46, wherein said treatment tank is in the shape of a bag a shape and capacity of which are variable.
79. The polluted soil remediation method according to claim 78, wherein said bag-shaped treatment tank has an accordion-fold structure.
80. The polluted soil remediation method according to claim 79, wherein a case covering said bag-shaped treatment tank is used.
81. The polluted soil remediation method according to claim 80, wherein said irradiating step is carried out by a light irradiation means located in a region inside said case and outside said bag-shaped treatment tank.
82. The polluted soil remediation method according to claim 46 further comprising a step of sending at least one portion of said gas containing the pollutant aspirated from said polluted soil directly to said treatment region.
83. The polluted soil remediation method according to claim 46, wherein chlorine radical is formed from chlorine contained in said mixed gas in said irradiating step.
84. The polluted soil remediation method according to any one of claims 46 to 83, wherein said light with which said mixed gas is irradiated in said irradiating step comprises a light within a range of wavelengths of 200 to 500 nm.
85. The polluted soil remediation method according to claim 84, wherein said light comprises a light within a range of wavelengths of 350 to 450 nm.
86. The polluted soil remediation method according to claim 46, wherein an irradiance of said light with which said mixed gas is irradiated is in the range of 10 Wcm2 to 10 mWcm2.
87. The polluted soil remediation method according to any of claim 86, wherein said irradiance is in the range of 50 WCm2 to 5 mWcm2.
88. The polluted soil remediation method according to claim 48, wherein said pollutant is a organic chlorine compound.
89. The polluted soil remediation method according to claim 88, wherein said organic chlorine compound is at least one of selected from the group consisting of chloroethylene, 1,1-dichloroethylene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, trichloroethylene, 1,1,1-trichloroethane, tetrachloroethylene, chloromethane, dichloromethane and trichloromethane.
90. A pollutant-degrading method in which a mixed gas of a gas containing a pollutant degradable with light irradiation in the presence of chlorine and a chlorine-containing gas is irradiated with light to degrade the pollutant, which comprises the steps of:
introducing the chlorine-containing gas;
mixing the gas containing the pollutant and the chorine-containing gas to form the mixed gas;
irradiating the mixed gas introduced in a treatment region of a bag-shaped treatment tank a shape and a capacity of which are variable with light to degrade the pollutant contained in the mixed gas; and
exhausting the degradation-treated mixed gas from the treatment region.
91. The pollutant-degrading method according to claim 90, wherein said bag-shaped treatment tank has an accordion-fold structure.
92. The pollutant-degrading method according to claim 90 or 91, wherein a case covering said bag-shaped treatment tank is used.
93. The pollutant-degrading method according to claim 92, wherein said irradiating step is carried out by a light irradiation means located in a region inside said case and outside said bag-shaped treatment tank.
94. The polluted-degrading method according to claim 90, wherein said gas containing said pollutant is at least one selected from the group consisting of a gas aspirated from a polluted soil, a polluted exhaust gas, a polluted gas desorbed from an activated carbon and a polluted gas originating from an aeration of a polluted water.