System for treating ship ballast water

Abstract

The invention relates to a system for treating ship ballast water for removing marine species and pathogenic bacteria from the ballast water, belonging to the application field of marine environmental protection technology. The system comprises a pipeline for discharging the ballast water in and out of a ballast tank of a ship, a seawater pump arranged on the pipe line for feeding and discharging water for the ballast tank, a coarse filter and a fine filter for sieving and filtering seawater, a detection instrument, a control system, an oxygen cabin, a nitrogen cabin and a gas-liquid mixing unit for rapid deoxidization and oxygenation. During the loading process, the ballast water is deoxidized by the gas-liquid mixing unit to limit oxygen content of the ballast tank, thus greatly lowering survival rate of aquatic organisms from the ballast water, avoiding formation of ferric oxide or rust, and reducing corrosion degree on the ballast water tank; and during the unloading process, the ballast water is oxygenated by the gas-liquid mixing unit to destroy anaerobic microbes in seawater, thus avoiding adverse effects of deoxygenated water on the local aquatic organisms.

Description

technical field [0001] The invention relates to a treatment system for ship ballast water, which is used for removing marine species and pathogenic bacteria in the ballast water, and belongs to the technical application field of marine environment protection. Background technique [0002] In order to maintain the required stability and safety of navigation, the ship's outboard water is often used as the ship's ballast water, which is injected or discharged from the ballast tank. The ship's ballast water is generally taken from the ship's departure port or the coastal waters it passes through, and its weight accounts for about 30%-60% of the ship's deadweight. According to relevant data, ships around the world carry about 12 billion tons of ballast water every year, and there are as many as 7,000 species of organisms that travel around the world in the ballast water of ships every day. These organisms live in ballast water in different ways. Invasion into new suitable living...

AI Technical Summary

Problems solved by technology

However, due to the replacement of ballast water, it is required that the ship is at least 200 nautical miles away from the nearest land or at least 200 meters deep in water when sailing, and the estimated ballast water operation volume of the ship is almost doubled when it is designed, so the cost of ballast water replacement The generated alternating stress will inevitably cause more fatigue burden on the hull, and the hull structure will inevitably enter the fatigue period earlier than expe...

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