DE10126692B4 - Process and installation for the treatment and recycling of bilge water from ship operation - Google Patents

Abstract

method for the treatment and re-use of bilge water from ship operations, whereby the oily one and emulsified bilge water initially in a usual one Bilgenwasserentölungsanlage pre-cleaned and then by adding a certain group of chemicals with failures of heavy metals and / or hydrocarbons contained in the bilge water to service water for the ship operation is prepared.

Description

The The invention relates to a method according to the preamble of the claim 1. In addition, the invention relates to a for carrying out the Process-serving plant according to claims 5 to 7th

The Invention is thus based on the task, the method and the Plant according to DE-PS 42 31 837 to improve so far that then the treated bilge water can be used in ship operation.

The oil polluted Bilge water is known not readily outboard pumped. According to the International Convention of 1973/78 for contraception marine pollution from shipping (MARPOL Convention) allowed oily Water with an inlet rate of> 5ppm, in special areas or> 15ppm, not be drained into the marine environment.

The Combination of several patented components, such as the IMO-MARPOL tested high pressure oiler with in integrated mechanical emulsion and foam breaker, a special membrane filtration system, are state of the art. This bilge water drainage system allows a cleaning performance according to the Time required environmental requirements. Practice shows, however, that these requirements will be increased in the future, so that no oily Water may be discharged into the sea.

Of the Invention is based on the object, by a permanent separation the bilge water removal plant outboard an introduction of oily and heavy metals into the marine environment prevent and processed according to the invention Continue to use service water in ship operation.

There the required capacities drinking water and industrial water resources on board a ship for the Crew are limited, this is required in their own facilities from seawater with a high energetic and costly effort to create.

In Sea areas where no drinking or industrial water from technical and hygienic reasons, e.g. in the roadstead and in ports, can or must be generated by external utilities be purchased.

The solution of this problem consists procedurally, according to claim 1 of the patent application, as in the 1 shown, in essence, to reprocess the prepurified in the Bilgenwasserentölungsanlage water in a downstream mechanical-chemical process to the extent that it can be used as process water (toilet flushing, cleaning, etc.). Following this use, the so-called black water in a ship's wastewater treatment plant is biologically cleaned and can be drained into the sea according to the discharge regulations for wastewater.

The Invention leaves Compressed represent as follows:

The in the 2 shown plant contains a bilge water treatment tank 2 ,

From a plant for cleaning oil-contaminated bilge water on ships as known from DE-PS 42 31 837 is known via a pipeline 1 the treated bilge water with a maximum residual oil content of 5 ppm or 15 ppm into the bilge water treatment tank 2 directed. The bilge water treatment tank 2 is the basic module of the system according to the invention.

According to the invention the tank is equipped with sieve-like Schlingerwänden in longitudinal and Quererspantbauweise. Furthermore, this is with a level monitoring device 3 , a pH measuring device 4 and with an overflow 5 into the bilge water storage tank 6 and with a slope of the tank bottom and an integrated sump 7 fitted. The tank bottom may preferably have the shape of an irregular polygon.

Via the signal "tank full" the dosing pump is activated 8th that in the bilge water treatment tank 2 introduced bilge water via another signal of the pH-value measuring device 4 experience has shown that it is adjusted to a pH of 3 to 6.

When the preset pH value is reached, the dosing pump is activated 9 a precipitant is added to precipitate heavy metals and the dissolved hydrocarbon compounds. To speed up the precipitation process is via the metering pump 10 Add a flocculant.

After a residence time of about 30 to 60 minutes, the precipitation process is completed so far that the precipitate on the inclined tank bottom or in the sump 7 has dropped off.

About the dosing pump 11 a neutralizing agent is added until neutral pH is reached.

The bilge water treated to process water is filtered through a filter system 12 and a pump 13 in the hot water tank 14 automatically pumped.

By means of a mud pump 15 the sludge accumulating in the treatment process is transferred via the pipeline 16 in the on-board mud tank 17 pumped out.

The treated water can now be used as service water in ship operation be used.

It has been shown in previous analytical studies that the aqueous phase according to the invention clear and colorless and lowered to drinking water level can.

• – Ölhaltiges und emulgiertes Wasser aus dem Schiffsmaschinenbetrieb wird nicht wie bisher nach der Reinigung in einer Bilgenwasserentölungsanlage, wie aus der DE-PS 42 31 837 bekannt, nach außenbords gepumpt, sondern in einer Bilgenwasserbehandlungsanlage zu Brauchwasser aufbereitet.
• – Durch eine permanente Trennung der Bilgenwasserentölungsanlage nach außenbords wird eine Einleitung von ölhaltigem und mit Schwermetallen belasteten Wasser in die Meeresumwelt verhindert.
• – Das in einer Bilgenwasserbehandlungsanlage aufbereitete Brauchwasser kann im Schiffsbetrieb vollständig genutzt werden.

The advantages of the method according to the invention or the system according to the invention are summarized again below:

• - Oil-containing and emulsified water from the marine engine operation is not pumped as before after cleaning in a Bilgenwasserentölungsanlage, as known from DE-PS 42 31 837, outboard, but processed in a bilge water treatment plant to process water.
• - A permanent separation of the Bilgenwasserentölungsanlage outboard prevents the introduction of oily and heavy metals contaminated water into the marine environment.
• - The treated in a bilge water treatment plant process water can be fully used in ship operation.

1

pipeline

2

Bilge water treatment tank

3

Level monitoring device

4

PH value measuring device

5

overflow

6

Bilge water storage tank

7

swamp

8th

metering

9

metering

10

metering

11

metering

12

filter system

13

pump

14

Water tank

15

slurry pump

16

pipeline

17

slurry tank

Claims (15)

Process for preparation and re-use from bilge water from ship operation, being the oily one and emulsified bilge water first in a usual Bilgenwasserentölungsanlage pre-cleaned and then by adding a certain group of chemicals with failures of heavy metals and / or hydrocarbons contained in the bilge water to service water for the ship operation is prepared. Method according to claim 1, characterized in that that the pre-cleaned bilge water first on one for the following precipitate appropriate pH, a pH of 3 to 6, is set, before the chemicals fail heavy metals and / or hydrocarbons are added. Method according to claim 2, characterized in that that after completion of the precipitation process the pH of the thus prepared bilge water by adding a neutralizing agent is reset to a neutral value. Method according to one of the preceding claims, characterized characterized in that the pre-cleaned bilge water in addition to the chemicals for the failure to speed up the precipitation process a flocculant is added. Method according to one of the preceding claims, characterized characterized in that the exposure time of the chemicals to precipitate between about 30 minutes and about 60 minutes. Method according to one of the preceding claims, characterized characterized in that the treated bilge water is filtered after precipitation. Method according to one of the preceding claims, characterized characterized in that incurred in the treatment failure products pumped out as sludge and collected in a mud tank. Plant for the treatment and re-use of bilge water from ship operation with a bilge water treatment tank ( 2 ), which has a pipeline ( 1 ) is connected to a conventional Bilgenwasserentölungsanlage, with a chemicals depot and with a metering pump ( 9 ), whereby via the metering pump ( 9 ) from the chemicals depot a precipitant in a predetermined dosage in the bilge water treatment tank ( 2 ) can be introduced. Plant according to claim 8, characterized in that it further comprises a pH measuring device ( 4 ) for measuring the pH of the bilge water treatment tank ( 2 ) Bilge water. Installation according to one of claims 8 or 9, characterized in that the bilge water treatment tank ( 2 ) via an overflow ( 5 ) with a bilge water storage tank ( 6 ) connected is. Installation according to one of claims 8 to 10, characterized in that it comprises a flocculant auxiliary depot, which via a metering pump ( 10 ) with the bilge water treatment tank ( 2 ) is connected to the metered introduction of a flocculant in this. Equipment according to one of claims 8 to 11, characterized in that the bilge water treatment tank ( 2 ) a sloping soil or a swamp ( 7 ) having. Plant according to claim 12, characterized in that it further comprises a sludge tank ( 17 ), which via a pipeline ( 16 ) and a mud pump ( 15 ) to the bottom of the bilge water treatment tank ( 2 ) or with the swamp ( 7 ) connected is. Installation according to one of claims 8 to 13, characterized in that it comprises a filter system ( 12 ) for filtering the from the bilge water treatment tank ( 2 ) withdrawn, treated bilge water has. Installation according to one of claims 8 to 14, characterized in that the bilge water treatment tank ( 2 ) in its interior in longitudinal and transverse bulkhead construction constructed, sieve-like Schlingerwände, in order to reduce the movement of the liquid in the tank, for example, in strong disability and tilting by swell, to a minimum.