CN101704573A - Neutralization treatment method for ballast water of ships - Google Patents
Neutralization treatment method for ballast water of ships Download PDFInfo
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- CN101704573A CN101704573A CN200910230196A CN200910230196A CN101704573A CN 101704573 A CN101704573 A CN 101704573A CN 200910230196 A CN200910230196 A CN 200910230196A CN 200910230196 A CN200910230196 A CN 200910230196A CN 101704573 A CN101704573 A CN 101704573A
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- neutralizing agent
- sodium thiosulfate
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- residual oxide
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Abstract
The invention relates to a neutralization treatment technical method for ballast water of ships, belonging to the field of anticorrosive and antifouling techniques of ship equipment. Saturated sodium thiosulfate solution is used as a neutralizing agent, the molar ratio of concentration of sodium thiosulfate to concentration of residual oxide (TRO) is that sodium thiosulfate:sodium hypochlorite=(0.2-2):1, wherein the concentration of the residual oxide is converted into the concentration of the sodium hypochlorite according to equivalents; sodium thiosulfate crystals are firstly added in a neutralizing agent storage tank filled with seawater while stirring until insoluble crystals appear at the bottom of the tank, wherein the solubility of the sodium thiosulfate is about 70 grams in water at normal temperature; then the neutralizing agent storage tank is sealed and stored on the ship for later use; the method has simple neutralization treatment process, simple and convenient formulation of the used neutralizing agent, flexible use and operation, and good neutralizing effect; the concentration of the residual oxide in the discharged ballast water is less than 0.02mg/L; the concentration of the residual sodium thiosulfate is less than 100mg/L; and discharge standards prescribed by IMO are reached.
Description
Technical field:
The invention belongs to ship's fitting anticorrosion and antifouling technical field, relate to a kind of neutralizing treatment technological method of ballast water for ship.
Background technology:
Along with the continuous quickening of global economic integration progress, the international logistics industry increases rapidly, and ship is a ring important in the global logistics chain.According to statistics, the goods in the international trade is transported by boats and ships more than 80%.In the ship's navigation process, ballast is a kind of inevitable state, and boats and ships are when installing water ballast additional, and local aquatic organism also will be loaded in the ballast tank thereupon, arrive the marine site, point of destination with discharge of ballast water behind Completion of the Adventure.Water ballast follow boats and ships from a ground to its ground, thereby caused the propagation of unwanted aquatic organism and pathogenic agent.In order to control and prevent ballast water for ship propagation unwanted aquatic organism and pathogenic agent effectively, International Maritime Organizaton (IMO) passed through " ballast water for ship and settling control and management international convention " in 2004." pact " regulation was from the beginning in 2009, and all new ships must be installed ballast water treatment plant, and existing vessel is reviewed enforcement.The ballast for cruising water technology has been carried out big quantity research both at home and abroad.The major technique that adopts has at present: electrolytic process, ozone method, dioxide peroxide method, ultraviolet irradiation, advanced oxidation processes etc.Wherein, electrolytic process, ozone method and dioxide peroxide method all belong to the method that adopts oxidative bactericide, its ultimate principle is by add materials such as oxidative bactericide such as clorox, ozone, dioxide peroxide in water ballast, make residual oxide (the Total Residual Oxidants in the water, abbreviation TRO) reaches certain level, keep certain hour, killing the unwanted aquatic organism in the water, thereby reach the water ballast standard of performance (D-2 standard) of International Maritime Organizaton (IMO) regulation.Yet this class technology is in the kill harmful aquatic organism, and the residual oxide during discharging (TRO) concentration can exceed standard, thereby secondary pollution is caused in the waters, especially to some short-legged boats and ships, this drawbacks limit such The Application of Technology.In order to address this problem, need a kind of neutralization method of development, promptly during the discharge of ballast water after processing,, make remaining TRO reach emission standard (less than 0.02mg/L), the elimination secondary pollution with in a certain amount of specific neutralizing agent and TRO.Present domestic this neutralization method of still not having.The neutralizing agent that the technology of external research and development adopts mainly is Sulfothiorine or S-WAT, adds neutralizing agent according to the ratio of stoichiometric equation, and then Can Yu TRO can not neutralized fully, does not reach the emission standard of IMO regulation, and therefore, neutralizing agent must be excessive.Yet in the existing neutralization method, the addition of neutralizing agent is all excessive too many, the problem that causes is that excessive neutralizing agent has consumed the dissolved oxygen in the water, cause the waters anoxic, cause the destruction of ocean environment equally, influence halobiontic growths such as algae, invertebrates and fish.
Summary of the invention:
The objective of the invention is to overcome the shortcoming that prior art exists, from economic, practical, effective angle, seek a kind of neutralizing agent and best adding proportion, the neutralizing treatment that is used for Treatment of Ships'Ballast Water, make it to eliminate residual oxide fully, it is minimum that the amount of remaining neutralizing agent is reduced to, thereby the influence of ocean environment is minimized.
To achieve these goals, the present invention adopts saturated sodium thiosulfate solution as neutralizing agent, and the solubleness of Sulfothiorine is big, and the neutralisation unit volume of ballast water treatment equipment is little, and the Sulfothiorine Nonpoisonous, non-environmental-pollution is convenient to the complement operation that the crewman carries out neutralizing agent; In and the time, the mole proportioning of Sulfothiorine and residual oxide (TRO) concentration is a Sulfothiorine: clorox=(0.2-2): 1, wherein residual oxide concentration is clorox concentration by equivalent conversion.
The collocation method of saturated sodium thiosulfate solution is as follows: add the thiosulfuric acid sodium crystal earlier in the neutralizing agent storage tank that seawater is housed, stir while adding, till undissolvable crystal was arranged at the bottom of the jar, under the normal temperature, the solubleness of Sulfothiorine in water was about 70 grams; The storage tank that neutralizing agent will be housed again aboard ship seal preserve standby.
During with the discharge of ballast water after the oxidative bactericide processing, measure TRO concentration remaining in the water with the TRO analyser earlier, simultaneously, the flow of water ballast also will be measured with under meter, the TRO concentration signal of measuring and the flow signal of water ballast reach controller, controller is according to above-mentioned adding proportion (Sulfothiorine: clorox=(0.2-2): 1, mol ratio), calculate the amount of the neutralizing agent that needs interpolation, with volume pump an amount of neutralizing agent is injected into ballast pump intake end, makes it complete reaction with TRO.
The present invention compared with prior art, neutralizing treatment technology is simple, the preparation of used neutralizing agent is easy, uses flexible operation, neutralization is good; Residual oxide concentration is less than 0.02mg/L in the water ballast of its discharging; Remaining concentration of sodium thiosulfate is less than 100mg/L; Reached the emission standard of IMO regulation.
Embodiment:
The invention will be further described below by embodiment.
Present embodiment carries out neutralizing treatment according to following three parameters of implementing in the concrete example to water ballast respectively, according to the method for EPA (EPA) remaining TRO and concentration of sodium thiosulfate in the water ballast before and after handling is measured, and the results are shown in Table 1:
Embodiment 1: present embodiment adopts saturated sodium thiosulfate solution as neutralizing agent, and the ratio of Sulfothiorine and remaining TRO concentration is a Sulfothiorine: clorox=0.2: 1 (mol ratio).
Embodiment 2: present embodiment adopts saturated sodium thiosulfate solution as neutralizing agent, and the ratio of Sulfothiorine and remaining TRO concentration is a Sulfothiorine: clorox=1: 1 (mol ratio).
Embodiment 3: present embodiment adopts saturated sodium thiosulfate solution as neutralizing agent, and the ratio of Sulfothiorine and remaining TRO concentration is a Sulfothiorine: clorox=2: 1 (mol ratio).
The water ballast neutralizing treatment effect that records among table 1 embodiment
Claims (1)
1. the neutralization method of a ballast for cruising water treatment, it is characterized in that saturated sodium thiosulfate solution is as neutralizing agent, the mole proportioning of Sulfothiorine and residual oxide concentration is Sulfothiorine: clorox=0.2-2: 1, and wherein residual oxide concentration is clorox concentration by equivalent conversion; Add the thiosulfuric acid sodium crystal earlier in the neutralizing agent storage tank that seawater is housed, stir while add, till undissolvable crystal was arranged at the bottom of the jar, the solubleness of Sulfothiorine in water was 70 grams under the normal temperature; The storage tank that neutralizing agent will be housed again aboard ship seal preserve standby; Residual oxide concentration is less than 0.02mg/L in the water ballast of its discharging; Remaining concentration of sodium thiosulfate is less than 100mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910230196A CN101704573A (en) | 2009-11-20 | 2009-11-20 | Neutralization treatment method for ballast water of ships |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910230196A CN101704573A (en) | 2009-11-20 | 2009-11-20 | Neutralization treatment method for ballast water of ships |
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| CN101704573A true CN101704573A (en) | 2010-05-12 |
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| CN200910230196A Pending CN101704573A (en) | 2009-11-20 | 2009-11-20 | Neutralization treatment method for ballast water of ships |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106573802A (en) * | 2014-08-12 | 2017-04-19 | 栗田工业株式会社 | Method for treating ballast water |
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2009
- 2009-11-20 CN CN200910230196A patent/CN101704573A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106573802A (en) * | 2014-08-12 | 2017-04-19 | 栗田工业株式会社 | Method for treating ballast water |
| US20170233270A1 (en) * | 2014-08-12 | 2017-08-17 | Kurita Water Industries Ltd. | Method for treating ballast water |
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Open date: 20100512 |