TEXTE Environmental Impacts of Exhaust Gas Cleaning Systems for Reduction of SOx on Ships — Analysis of status quo 
Report compiled within the framework of the project ImpEx 
— potential global impacts such as acidification and eutrophication. 
WET tests of samples, from representative areas, using internationally recognised 
methods are recommended to provide information on cumulative toxicity. 
7.1 Chemical composition of EGCS discharge water 
This chapter compiles the main research work on the chemical characterization of EGCS 
discharge water. The approach of the studies and the main findings related to chemical 
composition are presented in the following text (starting with the latest). Table A-4 shows an 
overview of the chemical composition of EGCS discharge water based on the results of recent 
research studies that carried out sampling campaigns on board ships during a sea voyage. 
Schmolke et al. (2020) (in Table A-4 presented as BSH) from the German Federal Maritime and 
Hydrographic Agency (BSH) carried out a study on behalf of the German Environment Agency 
(UBA). Here, five ships were sampled during a sea voyage in the North and Baltic Sea regions. 
The ships included three cruise ships, one vehicle carrier and one RoRo vessel. Three of them 
were equipped with hybrid EGCS, so that both operation modes were sampled, and the other 
two with OL system. The OL results presented in Table A-4 correspond to the sampling point in 
the outlet (after dilution, if existing). Two particularities of this study are the parallel 
measurement of turbidity, PAHpne and pH on board and comparison with the on-line monitoring 
data, and the determination of some additional PAHs> (no part of the priority PAHegpa16 list). 
Some of the main findings and discussions highlighted in the report are: 
Complete loss of alkalinity in most of the samples. 
Presence of metals mainly in dissolved form. 
a Significant enrichment of vanadium and nickel. 
Elevated concentrations of copper and zinc in some inlet samples. 
PAHs in most of inlet samples below the detection limits (PAHgra16: <LOD —- 0.3 ug/L). 
X 
h 
In OL discharge water, PAHs with 2-3 rings had a high contribution, especially 
naphthalene and its measured derivatives, and 4-6 rings PAHs had a low 
contribution to the total PAHs concentration; while an increase in the PAHs with 4-6 
rings was observed in CL discharge water. 
The five additionally measured PAHs represent a significant fraction of the total 
PAHs measured (PAHegra16 + additional PAHS). 
CL discharge water from the ship equipped with a hydrocyclone contained 
significantly less suspended solids than CL discharge water from the ships applying 
other treatment technologies. 
a 
Discrepancy between the on-line monitoring data and the parallel on-board 
measurements for turbidity, pH and PAHyne. 
5 Five additional PAH analyzed: 2-methyl-naphthalene, 2-methyl-naphthalene, dibenzothiophene, benzo- 
[e]pyrene and perylene. 
ACC