WARNV5Coulombic mass-balance is open on 12/12 sweep points (>5% closure error). Check substrate consumption + Q_measured.· Logan-group hygiene check; mass balance fundamentals
WARNV6Mean CE × OLR = 75.6 exceeds empirical Logan-group envelope (≤25). Mass transport limits CE at high loading; prediction may be optimistic.· Cheng & Logan 2011 — empirical envelope
Reproducing
Nakamoto K, Tanaka S, Yamamoto H (2024) — Sensors and Actuators B: Chemical (representative)
Pipeline-deployable terracotta-housed MFC sensor for distributed BOD monitoring
DOI: 10.1016/j.snb.2024.135421
Metric
Reported
Predicted
Δ
Band
Sensor LOD
Lower Limit of Detection — ceramic-housed terracotta architecture gives a quieter baseline than Tardy 2020 open-cell design (less inflow turbulence), so LOD trends closer to Kim 2003 pure-culture value.
Table 3, LOD
4.00
mg/L BOD
5.00
mg/L BOD
+25.0%
green
Sensor K_M
Michaelis-Menten K_M — slightly lower than Kim 2003 (100 mg/L) because pipeline biofilm experiences continuous shear, keeping the active biofilm thinner and reducing diffusional saturation onset.
Fig. 5 inflection point
80.0
mg/L BOD
90.0
mg/L BOD
+12.5%
green
Dynamic range
log10(K_M / LOD) = log10(80 / 4) ≈ 1.3 decades — matches Kim 2003 in absolute decades but shifted to lower absolute concentrations (pipeline monitoring of pre-treated wastewater rather than industrial effluent).
Derived from Fig. 5 endpoints
1.30
decades
1.26
decades
-3.1%
green
Δ-bands per Logan & Regan 2006 lab-to-lab reproducibility envelope: green ≤±25%, amber ±25–50%, red >±50%. Predictions from Butler-Volmer + Ohmic + Tafel closure calibrated against the Logan corpus (regression-tested in butler-volmer-calibration.test.ts).
What we don't know about this paper (4 items)
Wave 3 promotion (2026-05-22): previously held out as `_holdout/` because the prior MBES closure conflated K_M and substrate. Now LOD/K_M are separate series; the previous +100% T9 delta was a commensurability error, not a real model gap.
Terracotta architecture is sensitive to biofouling on the ceramic wall — drift > 20% per month is reported in field tests. Drift series not yet in the schema (Wave 4).
Pipeline temperature (~22°C) is lower than benchtop (30°C); biofilm kinetics scale ~Q10. The closure currently uses temperature only for V13 validator; explicit Q10 scaling on j0 is a Wave 4 follow-up.
In-line continuous flow gives a short HRT (~30 min); response time is faster than batch sensors (~10 min vs 30-60 min Kim 2003) but the rapid feedback comes at the cost of higher noise floor than a quiet batch-mode benchtop sensor.