IMO Approvaled Ballast Water Treatment System

IMO Approvaled Ballast Water Treatment System

1.Treatment Technology of BWMS System

The treating process of BWMS is mainly consisted of the following three procedures:

Filtration ---The ballast water is filtrated by an automatic backwashing filter with 50µm screen to remove marine organisms larger than 50µm.

Disinfection --- A small side stream of the filtered ballast water is delivered to the electrolytic unit to generate the oxidants of high concentration (mainly sodium hypochlorite solution), then the oxidants are injected back into the main ballast stream to provide effective disinfection.

Sodium hypochlorite solution as a very effective germicide can be kept in ballast water for a certain period to effectively kill the plankton, spores, larvae and pathogens contained in the ballast water to meet D-2 standard.

Neutralization --- The residual TRO level of the treated ballast water below 0.1ppm, then the treated ballast water can be directly discharged. If the residual TRO level of the treated ballast water over 0.1ppm, neutralizer (sodium thiosulfate solution) is added into the de-ballast pipe to neutralize residual oxidants instantly automatically.

2. Disinfection principle——Core technology

When seawater flows through the electrolyzer, decomposition reactions take place on the electrode surfaces, with chlorine produced at the anode and hydrogen gas at the cathode.

The reaction principle is as follows:

Anode: 2Cl- → Cl2 + 2e

Cathode: 2H2O + 2e → 2OH- + H2↑

Chlorine gas can be dissolved in water to produce hypochlorous acid and hydrochloric acid rapidly:

Cl2 + H2O → HOCl + Cl- + H+

So the whole reaction is:

NaCl + H2O → NaOCl + H2↑

Sodium hypochlorite solution as a very effective germicide can be kept in ballast water for a certain period to effectively kill the plankton, spores, larvae and pathogens contained in the ballast water. This technology has been widely practiced in water treatment industries like medical sterilization, water treatment fields for many years.

3. BWMS Working Process

4. BWMS Component

●Small volume and reasonable space

●High treatment capacity

●Good filtering effect

●Low pressure loss and flush swimmingly

●Especially suitable for atrocious sea water conditions

●Pressure difference control, time set control and manual control

5. Electrolysis Unit

●Small volume and high efficiency of the switching power of the Transformer Rectifier
●Reliable and high electrolysis efficiency of Tubular-plate Electrolyzer
●The volume of electrolyzer Module remains for different treatment capacity
●The life of core equipment component- electrolyzer can reach the ship service life requirement
●Own the Independent Intellectual Property Rights of the core components

6. Neutralization Unit

Manual control mode and automatic control mode.

When TRO concentrations of the discharge ballast water lower than the IMO specified value, the system does not start. Neutralization Unit automatically and ballast water discharge outboard directly.

When TRO concentration of the discharge ballast water higher than the IMO specified value, the system start Neutralizer Unit automatically and inject the neutralization which could eliminate and neutralize the residual TRO. The flow of neutralization is controlled by the system automatically.

7. Specification of BWMS System

Model	Treatment Capacity	Flow Rate to Electrolyzer	Required Power	Dimension
				Filter (mm)	Electrolysis Unit (mm)
	(m3/h)	(m3/h)	(AC KVA)	L×W×H	L×W×H
BC-300	100-300	6	15	3000×600×800	2500×1800×2200
BC-500	301-500	6	25	3300×600×800	2600×1800×2300
BC-1000	501-1000	12	50	3300×600×800	2900×2300×2200
BC-1500	1001-1500	20	75	3400×800×1070	3000×2600×2100
BC -2000	1501-2000	20	100	3300×1500×800	3300×2500×2200
BC -2500	2001-2500	36	125	3400×1800×1070	3500×2900×2400
BC -3000	2501-3000	36	150	3400×1800×1070	3500×2900×2400
BC -3500	3001-3500	36	175	3400×1800×1070	3800×2400×2500
BC -4000	3501-4000	36	200	3500×3300×770	3800×2400×2600
BC -5000	4001-5000	45	250	3500×3600×770	4000×2800×2600