The Clean Shipping
Alliance 2020 (CSA 2020) has presented results of a three-year study of the
composition and quality of exhaust gas cleaning system (EGCS) washwater based
on samples taken from cruise ships.
alliance took advantage of the 6th session of the International Maritime
Organization (IMO) Sub-Committee on Pollution Prevention and Response (PPR6)
held in London this week – and the presence of member state delegates from
across the world – to hold its first technical conference on the topic and
present the study.
Carnival-led study collected 281 wash water samples from 53 EGCS-equipped
cruise ships, the largest washwater data set in the marine industry, which were
then assessed against 54 different test parameters by ISO accredited
resulting laboratory analysis reports were then evaluated by classification
society DNV GL’s Maritime Advisory Services and the data compared against
various water quality standards, after first confirming that the samples
analysed were consistently well within the allowable IMO criteria and
the results were compared to selected national and international water quality
standards and land-based wastewater discharge limits.
to CSA 2020, EGCS results “compared favourably with all of
“Comparing scrubber wash water to various
other major water standards is useful to provide perspective and to illustrate
EGCS wash water quality in a way that is easy to understand. These comparisons
also provide relatable criteria for a number of specific EGCS parameters of
interest, such as PAH concentrations, which also have limits within these
standards,” Mike Kaczmarek, Carnival’s Senior Vice President
for Marine Technology, explained.
“Although these are all recognized standards
that are designed to regulate other waters, they do provide confirmation of the
quality of water that operators of this technology are returning to the sea,
and they provide strong support to the IMO’s decision to approve these systems
as acceptable means of compliance throughout the world’s regional and 2020
global emission control areas (ECAs),” he added.
“We want to emphasise that this major study
was intended to provide an objective assessment of the quality of scrubber wash
water through a rigorous comparison to other world water quality standards, and
it now represents the largest, most credible and verifiable data set
available,” Ian Adams, Executive Director, CSA 2020,
“And importantly, the results reaffirm that
exhaust gas cleaning systems are effective and safe for the ocean environment,” Adams