WO2020203779A1 - 水処理システム - Google Patents
水処理システム Download PDFInfo
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- WO2020203779A1 WO2020203779A1 PCT/JP2020/014036 JP2020014036W WO2020203779A1 WO 2020203779 A1 WO2020203779 A1 WO 2020203779A1 JP 2020014036 W JP2020014036 W JP 2020014036W WO 2020203779 A1 WO2020203779 A1 WO 2020203779A1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
Definitions
- the present invention purifies the water to be treated by removing the organic compound from water containing the organic compound (hereinafter referred to as water to be treated), while concentrating water containing the organic compound removed from the water to be treated. Regarding a system that highly concentrates water.
- the water to be treated that is discharged from factories, research facilities, etc. may contain organic compounds having harmful properties, and the water to be treated cannot be discharged as it is into sewage or the like. Therefore, a water treatment device that removes organic compounds contained in the water to be treated and discharges the purified treated water is used.
- an adsorption device using an adsorption element such as activated carbon is widely used.
- the water treatment apparatus described in Patent Document 1, Patent Document 2 and Patent Document 3 is provided with an adsorption element for purifying the water to be treated, and by allowing the adsorption element to pass the water to be treated.
- the organic compound in the water to be treated is adsorbed and removed by the adsorption element, and discharged as purified water (hereinafter referred to as treated water).
- the organic compound adsorbed on the adsorbing element is desorbed and discharged as a gas containing the organic compound (hereinafter referred to as desorption gas).
- desorption gas a gas containing the organic compound
- the desorbed gas is introduced into a condenser, cooled and condensed, and discharged as concentrated water of an organic compound (hereinafter referred to as concentrated water).
- Japanese Patent Publication Japanese Patent Laid-Open No. 2014-217833
- Japanese Patent Publication Japanese Patent Laid-Open No. 2014-217832
- Japanese Patent Publication Japanese Patent Laid-Open No. 2015-42396
- an object of the present invention is to provide a water treatment system excellent in high concentration of concentrated water containing an organic compound.
- the present invention has the following configuration. 1.
- Adsorption treatment in which water to be treated containing an organic compound is passed through an adsorption element to adsorb the organic compound, and desorption in which water vapor is passed through the adsorption element to desorb the adsorbed organic compound and discharge it as a desorption gas.
- a water treatment device provided with a treatment tank that alternately performs treatment and a condensing means that condenses the desorbed gas and discharges it as condensed water, and an external line that discharges the condensed water as concentrated water to the outside of the system.
- the circulation line for returning the condensed water as circulating water to the water to be treated and whether the condensed water is discharged as the concentrated water or returned to the water to be treated as the circulating water are separated. It is equipped with a distribution adjusting means.
- a measuring means for measuring the concentration of an organic compound is provided in a discharge line for discharging the condensed water from the condensing means or in an introduction line for introducing the treated water into the treatment tank, and the distribution adjusting means is the measuring means.
- the water treatment system according to 1 or 2 wherein when the organic compound concentration measured in 1 reaches a predetermined value, the ratio of the circulating water to the concentrated water is changed. 4.
- the adsorption element has a BET specific surface area of 700 to 2500 m 2 / g and a pore volume of 0.4 to 0.
- the water treatment system according to any one of 1 to 4 which comprises activated carbon fibers having an average pore diameter of 15 to 18 ⁇ and 9 cm 3 / g. 7.
- 8. 7 The water treatment system according to 7, further comprising a resupply line in which the removed water is resupplied to the water treatment apparatus.
- highly concentrated water containing an organic compound can be highly concentrated. Therefore, it is possible to reduce the secondary treatment cost of concentrated water.
- high value-added organic solvents can be highly concentrated and recovered to a reusable concentration.
- FIG. 1 is a configuration diagram of the water treatment system 1 of the present embodiment.
- the water treatment system 1 includes a water treatment device 100 and piping lines L1 to L7, removes organic compounds from the introduced water to be treated, discharges purified treated water, and concentrates containing an organic solvent. It is a system that discharges water at a high concentration.
- the water treatment device 100 is a device that adsorbs and removes organic compounds from the water to be treated and discharges the purified treated water, and has a treatment tank 130 in which the adsorption element 120 is housed.
- the number of treatment tanks 130 may be one or a plurality.
- FIG. 1 shows a case where there are two treatment tanks 130. To explain according to this, one treatment tank 130 functions as an adsorption tank for performing adsorption treatment, and the other treatment tank 130 functions as a desorption tank for performing desorption treatment.
- the treatment tank 130 functioning as an adsorption tank adsorbs the organic compound contained in the water to be treated and discharges the treated water.
- the organic compound is removed from the water to be treated.
- the treatment tank 130 that functions as a desorption tank desorbs the adsorbed organic compound and discharges the desorbed gas.
- the adsorbent 120 is regenerated.
- the adsorption tank and the desorption tank are configured to be alternately switched with time.
- the discharged desorbed gas (organic compound and water vapor) is introduced into a condenser (condensing means) 140, cooled and condensed, and discharged as condensed water.
- a condenser condensing means
- the condensed water is circulated again to the water to be treated as circulating water to increase the concentration of the organic compound in the water to be treated, so that the adsorbing element can be treated.
- the adsorption element 120 is configured to include an adsorbent that adsorbs an organic compound.
- the adsorbing element 120 preferably contains at least one adsorbent among activated carbon, activated carbon fiber and zeolite.
- activated carbon fiber granular, fibrous, honeycomb-shaped activated carbon or zeolite can be used, and among them, activated carbon fiber is preferable.
- Activated carbon fiber has a fibrous structure with micropores on the surface, has high contact efficiency with water, especially the adsorption rate of organic compounds in water is high, and it is possible to realize extremely high adsorption efficiency compared to other adsorbents. Because it is a material.
- the physical properties of the activated carbon fiber that can be used as the adsorption element 120 are not particularly limited, but have a BET specific surface area of 700 to 2500 m 2 / g and a pore volume of 0.4 to 0. It is preferably 9 cm 3 / g and has an average pore diameter of 15 to 18 ⁇ . This is because when the BET specific surface area is 700 m 2 / g or more, the pore volume is 0.4 m 3 / g or more, and the average pore diameter is 15 ⁇ or more, it is easy to increase the adsorption amount of the organic compound.
- the BET specific surface area is 2500 m 2 / g or less
- the pore volume is 0.9 m 3 / g or less
- the average pore diameter is 18 ⁇ or less
- the adsorption capacity of substances having a small molecular weight or the like is increased or the strength is increased. It is preferable because it can easily reduce the material cost.
- the water treatment device 100 includes two treatment tanks 130 in which the adsorption element 120 is housed, and a condenser 140.
- the water to be treated is introduced from the piping line L1 into the treatment tank 130 that functions as a suction tank, and the suction element 120 filled in the treatment tank 130 is passed through the treatment tank 130.
- the organic compound contained in the water to be treated is adsorbed on the adsorption element 120, and the water to be treated is discharged from the piping line L2 as purified treated water.
- the water treatment device 100 introduces water vapor introduced from the piping line L3 into the adsorption element 120 of the treatment tank 130 that functions as a desorption tank, and desorbs the organic compound adsorbed on the adsorption element 120.
- the desorbed gas passes through the piping line L4, is introduced into the condenser 140, is cooled and condensed, and is cooled and condensed. It is discharged as condensed water from the piping line L5.
- the condensed water discharged from the condenser 140 is introduced into either the piping line L6 or the piping line L7 via a valve (distribution adjusting means) 200.
- the piping line L6 is a circulation line that returns the condensed water as circulating water to the water to be treated
- the piping line L7 is an extrasystem line that discharges the condensed water as concentrated water to the outside of the system.
- the valve 200 determines whether to use circulating water for circulating condensed water or concentrated water for discharging the condensed water to the outside of the system.
- the water treatment system 1 may be configured to discharge a part of the condensed water as concentrated water and circulate the remaining condensed water as circulating water to the water to be treated by controlling the valve 200.
- adsorption treatment, desorption treatment, condensation treatment, circulation of circulating water and discharge of concentrated water are set as one cycle, and all condensed water is circulated as circulating water up to a predetermined number of cycles, and the predetermined number of cycles.
- a part of the condensed water is discharged as concentrated water and the remaining condensed water is circulated to the water to be treated as circulating water, or when the predetermined number of cycles is exceeded, all the condensed water is treated as concentrated water.
- It may be configured to be discharged to the outside. Alternatively, it may be adjusted to gradually reduce the circulating water and increase the concentrated water.
- the water treatment system 1 may include a measuring instrument (measuring means) (not shown) for measuring the concentration of organic compounds in condensed water or treated water. Then, when the concentration of the organic compound measured by the measuring instrument reaches a constant value, it may be determined whether the condensed water is circulated as circulating water or discharged as concentrated water by controlling the valve 200.
- the valve 200 may be controlled manually or automatically.
- the water treatment system 1 enables highly concentrated water containing an organic compound. Therefore, it is possible to reduce the secondary treatment cost of concentrated water.
- high value-added organic solvents can be highly concentrated and recovered to a reusable concentration. Further, even when treating high-concentration water to be treated by the water treatment system 1, it is possible to purify the water without increasing the amount of the adsorbing element required for removing the organic compound.
- the water treatment system 1 is not particularly limited, but includes a water storage tank and a pump, and the water to be treated is supplied from the water storage tank to the treatment tank 130 by a pump through the piping line L1. It may be configured to be.
- the water treatment device 100 removes (dehydrates) the water adhering to the adsorption element 120 and discharges it as the removed water, and then starts desorption by steam. Is preferable. This is because the desorption efficiency can be improved by removing the adhering water adhering to the adsorption element 120 by the adsorption treatment before desorption and then performing the desorption.
- the means for removing the adhering water means such as self-weight removal, high-speed purging with a gas such as air, water vapor, nitrogen, or an inert gas, or suction using a vacuum pump or the like can be used, but high-speed purging with water vapor is preferable. This is because the dehydration efficiency is high and the flow path configuration of the device is simple.
- the removed water is configured to be supplied to the water treatment device 100 again. This is because it is not necessary to separately treat the removed water. In this case, the removed water is returned to the water treatment device 100 without passing through the condenser 140 (not shown).
- the organic compound contained in the water to be treated of the water treatment system 1 of the present embodiment is not particularly limited, but aldehydes such as formaldehyde, acetaldehyde, propionaldehyde and achlorine, methyl ethyl ketone, diacetyl, methyl isobutyl ketone and acetone.
- aldehydes such as formaldehyde, acetaldehyde, propionaldehyde and achlorine, methyl ethyl ketone, diacetyl, methyl isobutyl ketone and acetone.
- Ketones such as 1,4-dioxane, 2-methyl-1,3-dioxolane, 1,3-dioxolane, tetrahydrofuran, methyl acetate, ethyl acetate, propyl acetate, butyl acetate and other esters, ethanol, n-propyl Alcohols, isopropyl alcohols, alcohols such as butanol, glycols such as ethylene glycol, propylene glycol, diethylene glycol and triethylene glycol, organic acids such as acetic acid and propionic acid, phenols, aromatic organic compounds such as toluene, xylene and cyclohexane.
- Ethers such as diethyl ether, allylglycidyl ether, ditrils such as acrylonitrile, chlorine organic compounds such as dichloromethane, 1,2-dichloroethane, trichloroethylene, epichlorohydrin, N-methyl-2-pyrrolidone, dimethylacetamide,
- An example is an organic compound of N, N-dimethylformamide.
- the water to be treated may contain one or more of these.
- Total acidic group amount The amount of surface acidic groups was measured by the Boehm titration method. 60 ml of 0.01 mol / L sodium hydroxide aqueous solution was added to about 1 g of the activated carbon sample, and the mixture was permeated at 25 ° C. for about 2 hours. 25 ml of the filtrate obtained by passing the activated carbon sample and the solution through a glass filter and separating them was collected. An appropriate amount of phenolphthalein was added to the filtrate as an indicator, 0.01 mol / L hydrochloric acid was added dropwise with stirring, the amount of residual base at the time of neutralization was titrated, and the total acidic group amount was calculated by the following formula. ..
- the BET specific surface area is a BET plot obtained by measuring the amount of nitrogen adsorbed on a sample when the relative pressure is increased in the range of 0.0 to 0.15 under the boiling point (-195.8 ° C.) atmosphere of liquid nitrogen.
- the surface area (m 2 / g) per unit mass was determined by
- Pore volume The pore volume was measured by a gas adsorption method of nitrogen gas at a relative pressure of 0.95.
- Example 1 As Example 1, the water treatment system 1 shown in FIG. 1 was used.
- the adsorption element 120 As the adsorption element 120, the total acidic group amount is 0.06 meq / g, the average pore diameter is 17 ⁇ , the BET specific surface area is 2000 m 2 / g, the total pore volume is 0.85 cm 3 / g, the mass is 140 g / m 2 , and the thickness is 2 mm.
- Each treatment tank 130 was filled with activated carbon fiber to prepare a tubular treatment tank having an inner diameter of ⁇ 23 mm and a total length of 150 mm. The weight of the packed active carbon fiber at that time was 6.4 g.
- 1,4-dioxane As water to be treated, 5 mg / L of 1,4-dioxane was introduced into the water treatment apparatus 100, passed through the treatment tank 130 at 36 cc / min for 20 minutes, and then steamed at 120 ° C. for 1,4-dioxane. Desorption was performed, and the desorbed gas was cooled and condensed with a capacitor 140 at 10 ° C. Of the condensed water, 10% was discharged from the piping line L7 as concentrated water, and 90% was circulated in L6 as circulating water so as to be mixed with the water to be treated.
- the concentration of water to be treated during 13-cycle operation is 19 mg / L, and the treatment after passing 130 liquids in the treatment tank.
- the water concentration was 0.01 mg / L or less
- the concentrated water concentration was 57 mg / L
- the total amount of concentrated water discharged during the 13 cycles was 0.195 L.
- Comparative Example 1 As Comparative Example 1, a conventional water treatment system without a piping line L6 was used in the water treatment system 1 shown in FIG. In the conventional system of Comparative Example 1, the condensed water does not circulate and is discharged to the outside of the system as concentrated water. Using the conventional system of Comparative Example 1, 5 mg / L of 1,4-dioxane as water to be treated was passed through the treatment tank 130 at 36 cc / min for 20 minutes, and then 1.4-dioxane was mixed with steam at 120 ° C. Desorption was performed, and the desorbed gas was cooled and condensed with a capacitor 140 at 10 ° C.
- the concentration of treated water after passing 130 liquids in the treatment tank is 0.01 mg / L or less, the concentration of concentrated water is 17 mg / L, and when the adsorption treatment, desorption treatment, condensation treatment, and discharge treatment of concentrated water are taken as one cycle, 13 The total amount of concentrated water discharged during the cycle was 1.95 L.
- Table 1 shows the concentration of water to be treated, the concentration of treated water, and the concentration of concentrated water measured for Example 1 and Comparative Example 1.
- Example 1 using the water treatment system 1 has the same treated water concentration of 1,4-dioxane as that of Comparative Example 1 using the conventional system, but the concentrated water concentration is higher. Recognize. That is, it is shown that the water treatment system 1 can be highly enriched while maintaining the same removal performance as the conventional system.
- the condensed water can be concentrated more than before while maintaining the same removal performance as the conventional one in the water to be treated, and the amount of the concentrated water can be reduced. Therefore, it is possible to reduce the secondary treatment cost such as disposal of concentrated water, which can greatly contribute to the industrial world. In addition, by highly concentrating and recovering high-value-added organic solvents to reusable concentrations, it can greatly contribute to the industrial world.
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Abstract
Description
1.有機化合物を含有する被処理水を吸着素子に通流させて有機化合物を吸着させる吸着処理と、前記吸着素子に水蒸気を通流させて吸着された有機化合物を脱着して脱着ガスとして排出する脱着処理とを交互に行う処理槽、及び、前記脱着ガスを凝縮して凝縮水として排出する凝縮手段、を備えた水処理装置と、前記凝縮水を濃縮水として系外へ排出する系外ラインと、を備えた水処理システムにおいて、前記凝縮水を循環水として前記被処理水へ戻す循環ラインと、前記凝縮水を前記濃縮水として排出するか前記循環水として前記被処理水へ戻すかを振り分ける振分調整手段と、を備えている。
2.前記振分調整手段は、前記凝縮水の一部を前記濃縮水として排出し、残りの前記凝縮水を前記循環水として前記被処理水へ戻すよう調整する1に記載の水処理システム。
3.前記凝縮水を前記凝縮手段から排出する排出ラインに、または前記処理水を前記処理槽に導入する導入ラインに、有機化合物濃度を測定する測定手段を備え、前記振分調整手段は、前記測定手段にて測定した有機化合物濃度が所定値になると、前記循環水と前記濃縮水との割合を変更する1または2に記載の水処理システム。
4.前記処理槽を2つ以上備え、少なくとも1つの処理槽が前記吸着処理を実施する間に、別の少なくとも1つの処理槽が前記脱着処理を実施する1から3のいずれか1つに記載の水処理システム。
5.前記吸着素子は、活性炭・活性炭素繊維またはゼオライトの内、少なくとも一つを含む1から4のいずれか1つに記載の水処理システム。
6.前記吸着素子は、BET比表面積が700~2500m2/g、細孔容積が0.4~0. 9cm3/g、平均細孔径が15~18Åである活性炭素繊維を含む1から4のいずれか1つに記載の水処理システム。
7.前記吸着処理により前記吸着素子に付着した水を除去して除去水として排出する脱水手段を備えた1から6のいずれか1つに記載の水処理システム。
8.前記除去水が前記水処理装置に再度供給される再供給ラインを備えた7に記載の水処理システム。
以下に各構成について詳細に説明する。
吸着素子120は、有機化合物を吸着する吸着材を含んで構成される。吸着素子120は、活性炭、活性炭素繊維またはゼオライトの内、少なくとも一つの吸着材を含むことが好ましい。吸着材として、粒状、繊維状、ハニカム状等の活性炭やゼオライトが利用できるが、その中でも活性炭素繊維が好ましい。活性炭素繊維は表面にミクロ孔を有する繊維状構造を持ち、水との接触効率が高く、特に水中の有機化合物の吸着速度が速くなり、他の吸着材に比べて極めて高い吸着効率を実現可能な材料であるからである。
水処理装置100は、吸着素子120が収容された処理槽130を2つと、コンデンサ140とを備えている。
ンL3から導入した水蒸気を導入させて、吸着素子120に吸着した有機化合物を脱着する。脱着ガスは、配管ラインL4を通り、コンデンサ140に導入され、冷却凝縮され、
配管ラインL5から凝縮水として排出される。
配管ラインL6は、凝縮水を循環水として被処理水へ戻す循環ラインであり、配管ラインL7は、凝縮水を濃縮水として系外へ排出する系外ラインである。バルブ200は、凝縮水を循環させる循環水にするか、凝縮水を系外に排出する濃縮水にするか、を振り分ける。
なお、バルブ200の制御は、手動でも自動でもよい。
表面酸性基量はBoehm滴定法により測定した。活性炭試料約1gに対し0.01mol/Lの水酸化ナトリウム水溶液を60ml加え、25℃で約2時間浸透させた。活性炭試料と溶液をガラス濾過器で通過分離した濾液を25ml採取した。濾液に指示薬としてフェノールフタレインを適量加え、撹拌しながら0.01mol/L の塩酸を滴下して、中和した時点での残留塩基量を滴定し、以下の式で全酸性基量を算出した。
全酸性基量(meq/g)=(D×50×K)/(W×25)
D:吸着塩基性量(ml)
K:塩酸濃度(mol/L)
W:活性炭素試料
BET比表面積は、液体窒素の沸点(-195.8℃)雰囲気下、相対圧力0.0~0.15の範囲で上昇させたときの試料への窒素吸着量を数点測定し、BETプロットにより料単位質量あたりの表面積(m2/g)を求めた。
細孔容積は、相対圧0.95における窒素ガスの気体吸着法により測定した。
平均細孔径は、以下の式で求めた。
dp=40000Vp/S(ただし、dp:平均細孔径(Å))
Vp:細孔容積(cc/g)
S:BET比表面積(m2/g)
被処理水、処理水及び濃縮水中の有機化合物濃度はガスクロマトグラフ法により測定した。
実施例1として、図1に示す水処理システム1を用いた。
吸着素子120として、全酸性基量が0.06meq/g、平均細孔径17Å、BET比表面積2000m2/g、全細孔容積0.85cm3/g、質量140g/m2、厚さ2mmの活性炭素繊維を各処理槽130に充填し、内径φ23mm、全長150mmの筒状処理槽を作成した。その時の充填した活性
炭素繊維の重量は6.4gであった。
度は57mg/Lであり、13サイクルの間に排出された濃縮水の総量は0.195Lであった。
比較例1として、図1に示す水処理システム1において配管ラインL6の無い、従来の水処理システムを用いた。この比較例1の従来システムでは、凝縮水は循環せず濃縮水として系外に排出される。比較例1の従来システムを用いて、被処理水として5mg/Lの1,4-ジオキサンを36cc/minで処理槽130に20min間通液した後、120℃の水蒸気で1.4-ジオキサンの脱着を行い、脱着した脱着ガスを10℃のコンデンサ140で冷却凝縮した。処理槽130通液後の処理水濃度は0.01mg/L以下、濃縮水濃度は17mg/Lであり、吸着処理、脱着処理、凝縮処理、濃縮水の排出処理を1サイクルとしたとき、13サイクルの間に排出された濃縮水の総量は1.95Lであった。
100 水処理装置
120 吸着素子
130 処理槽
140 コンデンサ
200 バルブ(切替調整手段)
L1~L7 配管ライン
Claims (8)
- 有機化合物を含有する被処理水を吸着素子に通流させて有機化合物を吸着させる吸着処理と、前記吸着素子に水蒸気を通流させて吸着された有機化合物を脱着して脱着ガスとして排出する脱着処理とを交互に行う処理槽、及び、前記脱着ガスを凝縮して凝縮水として排出する凝縮手段、を備えた水処理装置と、前記凝縮水を濃縮水として系外へ排出する系外ラインと、を備えた水処理システムにおいて、
前記凝縮水を循環水として前記被処理水へ戻す循環ラインと、
前記凝縮水を前記濃縮水として排出するか前記循環水として前記被処理水へ戻すかを振り分ける振分調整手段と、を備えた水処理システム。 - 前記振分調整手段は、前記凝縮水の一部を前記濃縮水として排出し、残りの前記凝縮水を前記循環水として前記被処理水へ戻すよう調整する請求項1に記載の水処理システム。
- 前記凝縮水を前記凝縮手段から排出する排出ラインに、または前記処理水を前記処理槽に導入する導入ラインに、有機化合物濃度を測定する測定手段を備え、
前記振分調整手段は、前記測定手段にて測定した有機化合物濃度が所定値になると、前記循環水と前記濃縮水との割合を変更する請求項1または2に記載の水処理システム。 - 前記処理槽を2つ以上備え、少なくとも1つの処理槽が前記吸着処理を実施する間に、別の少なくとも1つの処理槽が前記脱着処理を実施する請求項1から3のいずれか1項に記載の水処理システム。
- 前記吸着素子は、活性炭・活性炭素繊維またはゼオライトの内、少なくとも一つを含む請求項1から4のいずれか1項に記載の水処理システム。
- 前記吸着素子は、BET比表面積が700~2500m2/g、細孔容積が0.4~0. 9cm3/g、平均細孔径が15~18Åである活性炭素繊維を含む請求項1から4のいずれか1項に記載の水処理システム。
- 前記吸着処理により前記吸着素子に付着した水を除去して除去水として排出する脱水手段を備えた請求項1から6のいずれか1項に記載の水処理システム。
- 前記除去水が前記水処理装置に再度供給される再供給ラインを備えた請求項7に記載の水処理システム。
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