Measurement of Sulfur-Dioxide Emissions from Ocean-Going Vessels in Belgium Using Novel Techniques

Roy, Ward Van; Nieuwenhove, Annelore Van; Scheldeman, Kobe; Roozendael, Benjamin Van; Schallier, Ronny; Mellqvist, J.; Maes, Frank

doi:10.3390/atmos13111756

Cited by 13 publications

(42 citation statements)

References 18 publications

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“…Airborne measurements have been shown to provide an efficient solution to monitor the compliance of OGVs with regard to the emission regulations [32][33][34][35][36][37][38][39]. Even so, the use of airborne measurement data has not yet been recognized as an independent legal evidence for observed possible non-compliant OGVs, and is thus far, merely used for riskbased targeting of inspections in ports.…”

Section: Of 24mentioning

confidence: 99%

“…Since 2015, the RBINS has been conducting airborne surveillance operations to monitor sulfur emissions from OGVs in accordance with MARPOL Annex VI Regulation 14 [34]. In addition, from 2020 onwards, the RBINS has been conducting airborne surveillance operations to monitor NOx emissions from OGVs in accordance with MARPOL Annex VI Regulation 13 [34][35][36].…”

Section: Airborne Measurementsmentioning

confidence: 99%

“…In addition, the alert was shared in the Thetis-EU database and became accessible to all EU Member States (section 2.3.) [34,35,42]. The provision of airborne alerts may therefore be considered as the first step in the enforcement chain.…”

Section: Airborne Measurementsmentioning

confidence: 99%

“…One of the reasons for getting a false alert were high emissions of VOC's, resulting in higher SO2 readings. These false positives were eliminated from 2020 on by installing a customized hydrocarbon kicker [35]. Very high NOx non-compliances may also have impacted FSC measurements between 2016-2019.…”

Section: Confirmation Rate Of Airborne Alerts In Portsmentioning

confidence: 99%

“…Very high NOx non-compliances may also have impacted FSC measurements between 2016-2019. From 2020 on, this NO cross-sensitivity was also eliminated with the installation of the NOx sensor [35,36]. Nevertheless, both NO and VOCs have most likely only impacted the yellow flags.…”

Section: Confirmation Rate Of Airborne Alerts In Portsmentioning

confidence: 99%

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The Role of the Belgian Airborne Sniffer Measurements in the MARPOL Annex VI Enforcement Chain

Roy¹,

Merveille²,

Scheldeman³

et al. 2023

Preprint

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Responding to an urgent call for effective and cost-efficient enforcement of emission regulations from ocean-going vessels (OGVs) at sea, the Royal Belgian Institute of Natural Sciences, one of the 17 official partners of the Belgian coastguard structure, launched its airborne sniffer program in 2015. A custom-built sniffer sensor was installed on board of the Belgian coastguard aircraft and has been used for the in-situ measurement of SO2 and NOx in OGV exhausts, providing non-compliance alerts to port inspection authorities in Belgium and other EU member states. To guarantee the consistency in quality and reliability of the airborne non-compliance alerts, the standard operational procedures and measurement methodology have been described and recorded in a sniffer quality management system (SQMS). As part of the SQMS, alerting thresholds for non-compliance with SO2 and NOx standards were defined based on the emission limits and the measurement uncertainty. In addition, compliant measurements for the fuel sulfur content (FSC) were shared through Thetis-EU, which is the sulfur inspection database hosted by the European Maritime Safety Agency (EMSA). By providing both non-compliance alerts and compliant measurements to port inspection authorities, the coastguard aircraft fulfills a first-step in the enforcement chain. This article demonstrates that the reported alerts have not only led to several sanctions, but the analysis also showed that the provision of airborne alerts improved the efficiency of the port inspection authorities drastically, resulting in a cost-efficient improvement of their enforcement strategy. Port inspection authorities were able to follow-up on 46% of the generated FSC alerts. In addition, 43% of the alerted OGVs, which were followed up, were confirmed as non-compliant after a port inspection. Accordingly, conditions were in place to effectively sanction 20% of the non-compliant observations. For NOx alerts, a limited follow-up was done by port inspection authorities and none of the alerts were confirmed by those inspections, which is mainly due to the lack of suitable inspection mechanisms and the absence of additional EU implementation regulations on NOx emission inspections. Aiming at paving the way for a stricter enforcement of airborne non-compliance alerts, a validation analysis was done between the airborne FSC measurements and reference FSC measurements. In addition to onboard measurements from exhaust gas cleaning systems (EGCS), analyzes of fuel samples were also carried out by port inspection authorities in order to acquire reference measurements. The validation analysis presented in this study showed that the empiric deviation of the airborne FSC measurements with the reference measurements was significantly lower than the uncertainty used in the reporting thresholds. It has also been shown that aerial measurements provide evidence-based data that, given an appropriate confidence interval, has the potential to be considered reliable legal evidence.

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