D-2 Discharge Compliance Check

BWM Convention D-2 limits for treated ballast water: ≤ 10 viable organisms/m³ (≥ 50 µm) and ≤ 10/mL (10–50 µm).

Ballast WaterBWM

Organisms ≥ 50 µmper m³Organisms 10–50 µmper mLE. colicfu/100 mLIntestinal enterococcicfu/100 mLV. cholerae (O1 + O139)cfu/100 mL

Organisms ≥ 50 µm: PASS

Organisms 10–50 µm: PASS

E. coli (≤ 250): PASS

Enterococci (≤ 100): PASS

V. cholerae (< 1): PASS

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\begin{array}{l} N_{\geq 50\mu m} \leq 10 \text{ per m}^3 \ N_{10-50\mu m} \leq 10 \text{ per mL} \end{array}

Symbol	Meaning	Unit
$≥50 µm$	Zooplankton-sized organisms	per m³
$10–50 µm$	Microalgae-sized organisms	per mL
$E. coli / Enterococci / V. cholerae$	Indicator microbes	cfu/100 mL

Source: BWM Convention Regulation D-2; MEPC.300(72) BWMS Code

In short

BWM Convention D-2 limits for treated ballast water: \u2264 10 viable organisms/m\u00b3 (\u2265 50 \u00b5m) and \u2264 10/mL (10\u201350 \u00b5m).

Learn the theory BWM Convention 2004: Ballast Water Management