WO2016024342A1 - バラスト水の処理方法 - Google Patents
バラスト水の処理方法 Download PDFInfo
- Publication number
- WO2016024342A1 WO2016024342A1 PCT/JP2014/071345 JP2014071345W WO2016024342A1 WO 2016024342 A1 WO2016024342 A1 WO 2016024342A1 JP 2014071345 W JP2014071345 W JP 2014071345W WO 2016024342 A1 WO2016024342 A1 WO 2016024342A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ballast water
- active substance
- added
- chlorine
- turbidity
- Prior art date
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Classifications
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J4/00—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for
- B63J4/002—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for for treating ballast water
-
- 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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- 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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Definitions
- the present invention relates to a treatment method for controlling ballast water by optimally determining the addition amount of a chlorinated active substance in ballast water treatment.
- the standard set by the International Maritime Organization (IMO) as a standard for the treatment of ship ballast water is that the number of organisms (mainly zooplankton) of 50 ⁇ m or more contained in the ship ballast water discharged from the ship is less than 10 in 1 m 3 , The number of organisms (mainly phytoplankton) of 10 ⁇ m or more and less than 50 ⁇ m is less than 10 in 1 ml, the number of Vibrio cholerae is less than 1 cfu in 100 ml, the number of E. coli is less than 250 cfu in 100 ml, and the number of enterococci in 100 ml Less than 100 cfu.
- IMO International Maritime Organization
- microorganisms can be obtained by adding a disinfectant of chlorinated active substances such as sodium hypochlorite and calcium hypochlorite to ship ballast water to ensure residence time.
- a disinfectant of chlorinated active substances such as sodium hypochlorite and calcium hypochlorite
- the ship ballast water processing method which kills etc. is proposed.
- the addition amount of the chlorinated active substance in this ballast water treatment is determined using the maximum allowable addition amount (MAD) set at the time of basic approval of IMO as an index.
- MAD maximum allowable addition amount
- the chlorine attenuation prediction method described in Patent Document 1 often adds a chlorine-based active substance at a high concentration to ballast water for prediction.
- the initial attenuation rate of the chlorine-based active substance is high. Therefore, the correlation between the initial chlorine consumption rate and the subsequent chlorine consumption rate is reduced, and the chlorine concentration in a few days is expected from a relatively short time after the addition of the active substance, for example, a chlorine consumption of 120 minutes or less. There was a problem that it was difficult.
- the quality of water in actual ballast water varies depending on many factors such as the contamination status of the sampling site, the depth of the sampling water, the timing of sampling, and the duration of the voyage.
- This change in water quality depends not only on SS but also on the types and amounts of DOC, POC, ammonia, nitrous acid, inorganic salts, and organic substances.
- the conventional method has a problem that it cannot follow that the consumption rate of the chlorinated active substance varies with the change in water quality.
- the present invention aims to solve such problems and provide a ballast water treatment method capable of optimally determining the addition amount of a chlorinated active substance in ballast water treatment.
- the present invention provides a ballast water treatment method for adding a chlorinated active substance for sterilizing aquatic microorganisms in the ballast water when supplying the ballast water taken to the ballast tank.
- the turbidity of untreated ballast water to which no chlorinated active substance is added is measured in advance, and a chlorinated active substance determined based on the turbidity is added to neutralize the ballast water.
- a method for treating ballast water is provided (Invention 1).
- the total residual oxidizing substance concentration (TRO) of the ballast water is preferably 0.5 to 3 mg / L (asCl 2 ) at the time of discharge (Invention 2).
- invention 2 if the total residual oxidizing substance concentration (TRO) after neutralization of ballast water is 0.5 mg / L or more, harmful plankton, bacteria, etc. are reduced to a reference value or less. On the other hand, if it is 3 mg / L or less, the environmental load at the time of discharge can also be reduced.
- the total residual oxidizing substance concentration can be obtained simply by adding a chlorine-based active substance in proportion to turbidity.
- the chlorine-based active substance when the turbidity value is less than 10 NTU, the chlorine-based active substance is added so as to be 2 to 14 mg / L (asCl 2 ), and more than 10 NTU and less than 50 NTU In this case, the chlorinated active substance is added to 2 to 30 mg / L (asCl 2 ), and in the case of 50 NTU or more, the chlorinated active substance is added to 18 to 30 mg / L (asCl 2 ). It is preferable to add in such a manner (Invention 3).
- the chlorinated active substance is preferably one or more selected from dichloroisocyanurate, trichloroisocyanurate, and hypochlorite (Invention) 5).
- these chlorinated active substances are excellent in the bactericidal properties of microorganisms contained in ship ballast water and the like, and are calculated and measured by logarithmic formulas based on the total residual oxidizing substance concentration. Is suitable for determining the amount of addition of the chlorinated active substance.
- ballast water of the present invention untreated ballast water before actually adding a chlorinated active substance is collected, and the turbidity of this untreated ballast water is measured in advance. Since the addition amount of the chlorinated active substance is determined according to the value of, the excessive addition or insufficient addition of the chlorinated active substance can be prevented. Moreover, the toxicity of discharged water can be lowered and the amount of neutralizing agent added can be reduced.
- ballast water treatment method of the present invention will be described in detail based on one embodiment.
- the ballast water treatment method of the present embodiment determines the addition amount of a chlorinated active substance for sterilizing aquatic microorganisms in the ballast water when supplying the ballast water taken from the water intake to the ballast tank. Chlorine-based active substances that have been collected in advance and untreated ballast water to which no chlorinated active substances have been added are collected in advance, the turbidity of this untreated ballast water is measured in advance, and the turbidity determined To neutralize this ballast water during discharge.
- dichloroisocyanuric acid salt trichloroisocyanuric acid is excellent because it is excellent in bactericidal properties and approximates to some extent the calculation by the logarithmic formula by the total residual oxidizing substance concentration described later and the actual measurement value.
- One or more selected from salts and hypochlorites can be used, and hypochlorites such as sodium hypochlorite are particularly preferred.
- the total residual oxidizing substance concentration is TRO (Total Residual Oxidants), and the oxidizing chlorine concentration due to the addition of a chlorine-based active substance and other oxidizing components generated by reaction with this oxidizing chlorine are included. included.
- This total residual oxidizing substance concentration can be measured at room temperature using a commercially available high precision TRO meter using the DPD absorbance method.
- the amount of the chlorinated active substance added is turbid so that the total residual oxidizing substance concentration (TRO) after neutralization of the ballast water is 0.5 to 3 mg / L (asCl 2 ) at the time of discharge. Set accordingly. If the total residual oxidizing substance concentration (TRO) is less than 0.5 mg / L, it will be difficult to reduce harmful plankton and bacteria to below the standard value, or regrowth of bacteria and hatching of plankton eggs I invite you. On the other hand, even if it exceeds 3 mg / L, it is not only possible to obtain any more harmful plankton and bacteria killing effects, the amount of neutralizing agent required for neutralization increases, or the environment during discharge Since load increases, it is not preferable.
- a chlorinated active substance is added to be 2 to 14 mg / L (asCl 2 ), and when the turbidity value is 10 NTU or more and less than 50 NTU, An active substance is added so as to be 2 to 30 mg / L (asCl 2 ), and in the case of 50 NTU or more, the chlorinated active substance is added so as to be 18 to 30 mg / L (asCl 2 ),
- the total residual oxidizing substance concentration (TRO) at the time of discharge can be 0.5 to 3 mg / L (asCl 2 ).
- the control based on turbidity as described above may be controlled using a turbidimeter.
- the turbidity value is 10 NTU or more and less than 50 NTU
- the following formula (1) C 0.4X + a (1)
- C is the additive concentration of the chlorine-based active substance
- X is turbidity
- a is 2 to 10
- a chlorine system within the range of 2 to 30 mg / L (asCl 2 )
- the total residual oxidizing substance concentration (TRO) at the time of discharge can be set to 0.5 to 3 mg / L (asCl 2 ).
- a reducing agent is supplied to the discharged ballast water to reduce the remaining chlorine, and the residual chlorine concentration is reduced to the target residual chlorine concentration before being discharged to the external environment.
- sodium sulfite, sodium bisulfite (sodium hydrogen sulfite), sodium thiosulfate, or the like can be used as the reducing agent supplied from this reducing agent supply mechanism.
- the total residual oxidizing substance concentration is not limited to the measurement using a TRO meter using the DPD absorbance method, and various measuring means can be applied as long as similar measurement values can be obtained. Is possible.
- Example 1 The seawater (seawater 1 to 10) of 10 ports was sampled, and the turbidity of these seawaters was measured. Sodium hypochlorite was added to these seawaters at the addition concentrations shown in Table 1 (in terms of chlorine).
- Table 1 shows the results of measuring the total residual oxidizing substance concentration using the DPD method after sealing the seawater and leaving it in a dark room at 25 ° C. for 2 hours.
- those having a total residual oxidizing substance concentration (TRO) in the range of 0.5 to 3 mg / L (asCl 2 ) were used as examples, and those outside this range were used as comparative examples.
- TRO total residual oxidizing substance concentration
- FIG. 1 shows the relationship between the turbidity and the concentration of sodium hypochlorite added (in terms of chlorine) in Examples 1 to 11 and Comparative Examples 1 to 4. In FIG. Examples ( ⁇ ) and out of range are shown as comparative examples ( ⁇ ).
- turbidity or 50NTU examples of the addition concentration of sodium hypochlorite 18 ⁇ 30 mg / L in the range of (asCl 2) 29.9mg / L ( asCl 2) 11
- the total residual oxidizing substance concentration after standing for 2 hours is 0.9 mg / L (asCl 2 )
- the addition concentration of sodium hypochlorite is 12.8 mg / L (asCl 2 ).
- the total residual oxidizing substance concentration after standing for 2 hours was as low as 0.2 mg / L (asCl 2 ), and it was difficult to bring harmful plankton, bacteria, etc. below the standard value. It was.
- the concentration of sodium hypochlorite within the range of the thick solid line in FIG. 1, particularly when the turbidity value is less than 10 NTU, the concentration of chlorinated active substance added is 2 to 14 mg / L ( AsCl 2 ), if the turbidity value is 10 NTU or more and less than 50 NTU, the addition concentration of the chlorinated active substance is within the range satisfying C 0.4X + a, and if the turbidity value is 50 NTU or more, the chlorinated active substance It has been found that the amount of chlorinated active substance added in the treatment of ballast water can be set without excessive or insufficient addition by setting the concentration of the additive to within the range of 18 to 30 mg / L (asCl 2 ).
- ballast water treatment method of the present invention uses the ballast water treatment method of the present invention to collect untreated ballast water before actually adding the chlorinated active substance, and the turbidity of the untreated ballast water not added with the chlorinated active substance is measured in advance. Since the amount of chlorinated active substance added is determined according to this turbidity value, the optimum amount of chlorinated active substance added can be determined. The amount, space, and equipment can be optimized, and as a result, a cost-competitive processing apparatus can be provided.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
Description
C=z・C0・e-kt
(式中、C0は塩素注入管出口における塩素濃度であり、Cは時間(t)における塩素濃度であり、kは反応定数であり、tは経過時間であり、zは塩素注入後の塩素残留係数である。)
C=0.4X+a ・・・ (1)
(式中、Cは塩素系活性物質の添加濃度であり、Xは濁度であり、aは2~10である。)を満たす塩素系活性物質の添加濃度を決定するのが好ましい(発明4)。
C=0.4X+a ・・・ (1)
(式中、Cは塩素系活性物質の添加濃度であり、Xは濁度であり、aは2~10である。)を満たす、2~30mg/L(asCl2)の範囲内の塩素系活性物質の添加濃度を決定することにより、排出時における全残留酸化性物質濃度(TRO)を0.5~3mg/L(asCl2)とすることができる。
C2=0.4X+10 ・・・ (2)
(式中、C2は塩素系活性物質の添加濃度であり、Xは濁度である。)を満たし、2~14mg/L(asCl2)の範囲内の塩素系活性物質の添加濃度を決定することにより、排出時における全残留酸化性物質濃度(TRO)を0.5~3mg/L(asCl2)とすることができる。
〔実施例1~11及び比較例1~4〕
10か所の港湾の海水(海水1~10)をサンプリングして、これらの海水の濁度をそれぞれ測定した。これらの海水に対して表1に示す添加濃度(塩素換算)でそれぞれ次亜塩素酸ナトリウムを添加した。そして、この海水を密栓して25℃の暗室に2時間静置した後の全残留酸化性物質濃度をDPD法を用いてそれぞれ測定した結果を表1に示す。なお、表1において全残留酸化性物質濃度(TRO)が0.5~3mg/L(asCl2)の範囲内にあるものを実施例、これを外れるものを比較例とした。図1において太実線の範囲内(○)と範囲外(●)として表記した。また、これら実施例1~11及び比較例1~4における濁度と次亜塩素酸ナトリウムの添加濃度(塩素換算)との関係を図1に示すが、図1において太実線の範囲内を実施例(○)、範囲外を比較例(●)としてそれぞれ表記した。
Claims (5)
- 取水されたバラスト水をバラストタンクに供給するに際し、該バラスト水中の水生微生物を殺菌処理するための塩素系活性物質を添加するバラスト水の処理方法であって、
塩素系活性物質を添加していない未処理のバラスト水の濁度をあらかじめ測定し、該濁度に基づき決定された塩素系活性物質を添加して、前記バラスト水を中和する
ことを特徴とするバラスト水の処理方法。 - 前記バラスト水の全残留酸化性物質濃度(TRO)が、排出時において0.5~3mg/L(asCl2)であることを特徴とする請求項1に記載のバラスト水の処理方法。
- 前記濁度の値が10NTU未満の場合には、前記塩素系活性物質を2~14mg/L(asCl2)となるように添加し、10NTU以上50NTU未満の場合には、前記塩素系活性物質を2~30mg/L(asCl2)となるように添加し、50NTU以上の場合には、前記塩素系活性物質を18~30mg/L(asCl2)となるように添加することを特徴とする請求項1又は2に記載のバラスト水の処理方法。
- 前記濁度の値が10NTU以上50NTU未満の場合には、
C=0.4X+a ・・・ (1)
(式中、Cは塩素系活性物質の添加濃度であり、Xは濁度であり、aは2~10である。)を満たす塩素系活性物質の添加濃度を決定することを特徴とする請求項3に記載のバラスト水の処理方法。 - 前記塩素系活性物質が、ジクロロイソシアヌル酸塩、トリクロロイソシアヌル酸塩、次亜塩素酸塩から選ばれた1種または2種以上であることを特徴とする請求項1~4のいずれかに記載のバラスト水の処理方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/502,841 US20170233270A1 (en) | 2014-08-12 | 2014-08-12 | Method for treating ballast water |
PCT/JP2014/071345 WO2016024342A1 (ja) | 2014-08-12 | 2014-08-12 | バラスト水の処理方法 |
CN201480081116.0A CN106573802A (zh) | 2014-08-12 | 2014-08-12 | 压载水的处理方法 |
KR1020177004037A KR20170041211A (ko) | 2014-08-12 | 2014-08-12 | 밸러스트수의 처리 방법 |
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PCT/JP2014/071345 WO2016024342A1 (ja) | 2014-08-12 | 2014-08-12 | バラスト水の処理方法 |
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PCT/JP2014/071345 WO2016024342A1 (ja) | 2014-08-12 | 2014-08-12 | バラスト水の処理方法 |
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US (1) | US20170233270A1 (ja) |
KR (1) | KR20170041211A (ja) |
CN (1) | CN106573802A (ja) |
WO (1) | WO2016024342A1 (ja) |
Cited By (1)
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CN109071282A (zh) * | 2016-04-26 | 2018-12-21 | 杰富意工程株式会社 | 压舱水处理装置及压舱水处理方法 |
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JP2007144391A (ja) * | 2005-06-10 | 2007-06-14 | Jfe Engineering Kk | バラスト水処理装置及び処理方法 |
JP2012007969A (ja) * | 2010-06-24 | 2012-01-12 | Hokuto Denko Kk | バラスト水中の残留オキシダント(tro)濃度の監視方法 |
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CN101704573A (zh) * | 2009-11-20 | 2010-05-12 | 青岛双瑞防腐防污工程有限公司 | 一种船舶压载水处理的中和方法 |
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JP5938874B2 (ja) * | 2011-11-04 | 2016-06-22 | 栗田工業株式会社 | 船舶バラスト水処理剤及びこれを用いた船舶バラスト水の処理方法 |
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2014
- 2014-08-12 KR KR1020177004037A patent/KR20170041211A/ko not_active Application Discontinuation
- 2014-08-12 CN CN201480081116.0A patent/CN106573802A/zh active Pending
- 2014-08-12 US US15/502,841 patent/US20170233270A1/en not_active Abandoned
- 2014-08-12 WO PCT/JP2014/071345 patent/WO2016024342A1/ja active Application Filing
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JP2007144391A (ja) * | 2005-06-10 | 2007-06-14 | Jfe Engineering Kk | バラスト水処理装置及び処理方法 |
JP2012007969A (ja) * | 2010-06-24 | 2012-01-12 | Hokuto Denko Kk | バラスト水中の残留オキシダント(tro)濃度の監視方法 |
JP2014100673A (ja) * | 2012-11-20 | 2014-06-05 | Kurita Water Ind Ltd | バラスト水の制御方法 |
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CN109071282A (zh) * | 2016-04-26 | 2018-12-21 | 杰富意工程株式会社 | 压舱水处理装置及压舱水处理方法 |
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CN106573802A (zh) | 2017-04-19 |
KR20170041211A (ko) | 2017-04-14 |
US20170233270A1 (en) | 2017-08-17 |
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