Ship ballast water processing method combining ozone and photocatalysis

A technology for ship ballast water and treatment methods, which is applied in the field of ballast water treatment technology, can solve the problems of seawater secondary pollution, large equipment volume, and poor treatment effect, and achieve wide application range, small equipment volume, and small negative impact Effect

Inactive Publication Date: 2010-07-21
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] What is currently needed can overcome the shortcomings of the existing sea-going ship ballast water treatment technology, such as large equipment volume, high energy consumption, incomplete sterilization, secondary pollution to seawater, poor treatment effect, etc., and invent a brand new one. High-efficiency, low-energy-consumption, and no-secondary-pollution ballast water treatment process can meet the requirements of the International Maritime Organization, namely: safe, reliable, effective, environmentally acceptable and reasonable in cost

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  • Ship ballast water processing method combining ozone and photocatalysis
  • Ship ballast water processing method combining ozone and photocatalysis

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Embodiment 1

[0036] The ballast water taken from the Yangshan Deepwater Port was first filtered through a filter with a pore size of 50 μm. The concentration of algae with a diameter of less than 50 μm was 2.46×103 / ml, and the concentration of bacteria was 9.22×102 / ml. Plate ozone generator (ozone output > 10g / h), low-pressure mercury lamp with a dominant emission wavelength of 254nm, and a thin-film TiO2 photocatalyst prepared on an industrially pure titanium sheet as a supporting substrate for ozone / photocatalytic combined processor treatment 5 seconds, control the dosage of ozone to 0.5mg / L. Use the algae counting method and the ultraviolet-visible spectrometer method to detect the number of algae and bacteria, wherein the algae and bacteria with a diameter of less than 50 μm are not detected, and the killing rate is 99.99%. The ballast water treated by the method of the present invention can reach international standards. Indicators specified by the International Maritime Organization ...

Embodiment 2

[0038] After the ballast water taken from Ningbo Xiangshan Port is filtered through a filter with a pore size of 50 μm, the concentration of aquatic organisms with a diameter of less than 50 μm such as protozoa, algae, bacteria, and spores exceeds 4.01×104 / ml, and the COD of the ballast water It is 2.37mg / L. After adopting a commercially available ceramic plate ozone generator (ozone output > 10g / h), a low-pressure mercury lamp emitting a dominant wavelength of 254nm, and a thin-film TiO2 light prepared on a sponge-like porous ceramic as a supporting substrate After the photocatalytic strong oxidation reactor of the catalyst is treated for 5 seconds, the ozone dosage is controlled to be 0.5-0.7mg / L. Protozoa, algae and bacteria were detected, and the results were not detected, and the killing rate reached 99.99%; in the ballast water after the 3-day bacterial culture method, bacteria less than 50 μm were not detected, which proves that the method of the present invention can co...

Embodiment 3

[0040] After the ballast water taken from Ningbo Xiangshan Port is filtered through a filter with a pore size of 50 μm, the concentration of aquatic organisms with a diameter of less than 50 μm such as protozoa, algae, bacteria, and spores exceeds 3.98×104 / ml, and the COD of the ballast water is 1.62mg / L, by using a commercially available ceramic plate ozone generator (ozone output > 10g / h), a low-pressure mercury lamp with a dominant emission wavelength of 254nm, and a thin-film type prepared on a glass ball with a diameter of 5mm as a supporting substrate After 10 seconds of treatment in the photocatalytic strong oxidation reactor of TiO2 photocatalyst, the dosage of ozone is controlled to be 0.6-0.8mg / L. Protozoa, algae and bacteria were detected, and the results were not detected, and the killing rate reached 99.99%; in the ballast water after the 3-day bacterial culture method, bacteria less than 50 μm were not detected, which proves that the method of the present inventio...

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Abstract

The invention relates to a ship ballast water processing method combining ozone and photocatalysis, comprising the following steps of: firstly, processing sea water by a coarse filtering device; filtering the sea water by a 50 mum filter; further processing the sea water with an ozone/photocatalysis combined processor; introducing the sea water in a ballast warehouse to become ballast water; backwashing the filter with the sea water after loading the ballast water; reprocessing the ballast water with the ozone/photocatalysis combined processor before discharging; and discharging the ballast water. The method has higher reaction speed, can effectively kill protozoon, algae, germ, spore, and the like smaller than 50 mum with the sterilization time less than 10s and basically uses no chemicals. The invention has the advantages of no secondary pollution, little adverse impact on the environment, small volume of the processing device, low energy consumption, high processing efficiency and wide application range.

Description

technical field [0001] The invention belongs to the technical field of ballast water treatment, in particular to a ballast water treatment process combined with ozone / photocatalysis. Background technique [0002] With the rapid development of the global shipping economy, there are more and more ships, larger and larger ships, and faster and faster ships. Ballast water is an important guarantee for safe navigation of ships. It is estimated that the ballast water carried by ships around the world is about 12 billion tons per year, and it is still increasing year by year with the development of the shipping industry. There are more than 4,500 species of organisms that exist in the ballast water of ships and travel around the world every day. Many species of bacteria, plants and animals can still survive in ballast water and its sediments over months of voyage. Biological invasions and epidemics caused by the migration of organisms in the ballast water of ships around the worl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/78C02F1/30C02F1/32
Inventor 尹衍升董丽华张丽
Owner SHANGHAI MARITIME UNIVERSITY
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