Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Design and validation of a ballast water Compliance Sampling Device for shipboard use.

Abstract

As international regulations governing the discharge of living organisms in ships' ballast water enter into force, port state authorities will require a device for compliance inspectors or their designees to potentially use onboard ships to conduct compliance testing. Importantly, the device must be easy to transport, quick to connect to the main ballast water pipe, and reliable in collecting a representative sample of ballast water flowing through the pipe. To that end, a pocket-sized Compliance Sampling Device (CSD) was designed, fabricated, and validated. The CSD incorporates a fixed-orifice flow meter and a valve for controlling flow. Experiments were conducted to evaluate the accuracy and precision of flow measurements using the CSD. To determine whether the restricted flow through the device causes loss or damage to organisms, concentrations of living organisms and photochemical yield measurements of microalgae collected from the CSD were compared to controls (samples of water freely flowing through an unobstructed hose). No significant differences in concentrations of organisms or photochemical yield measurements were observed between samples. Results from these experiments showed that the device would be acceptable to collect compliance samples aboard ships.