MESSAI.io/Parameters
CatalogCorrelationsGlobal AnalysisParameter SweepMethodology
run 45204d62corpus v2026-05-19model gp-scm-v1.2.0ran 0.0s
SWEEPexternal_resistancefrom10to10000across12 log stepsat fixedT = 25°C, pH = 7, HRT = 31 h, area = 25 cm², culture = mixed_anaerobic
Viewpaper: salgado-hernandez-2021-algae-mdcbacktest (all papers)
anti-HARKing rail · Logan & Regan 2006
WARNV5Coulombic mass-balance is open on 9/12 sweep points (>5% closure error). Check substrate consumption + Q_measured.· Logan-group hygiene check; mass balance fundamentals
Platform
Microbial electrochemical systems · living biofilm catalyst
System type
Sweep parameter
Fixed conditions
Objective
Reproducing

Salgado-Hernández E, et al. (2021) — Processes

Algae-Assisted Microbial Desalination Cell: Analysis of Cathode Performance and Desalination Efficiency Assessment
DOI: 10.3390/pr9112011
MetricReportedPredictedΔBand
Current density
3-chamber MDC with Chlorella vulgaris biocathode (algae-driven ORR via dissolved O2 from photosynthesis), Geobacter sulfurreducens anode, ~15 g/L NaCl desalination chamber, 31-h cycle. Peak current density anchors the algae-sub-regime kinetic ceiling (~1 A/m² regime, photosynthetic O₂ supply at the cathode).
Abstract (verified via OpenAlex API): "current density of 0.12 mA/cm² at an efficiency of 60.15%". 0.12 mA/cm² × 10⁴ / 10³ = 1.2 A/m². The DB extraction (120 mA/m², paperId cmcv8hx95049h1yhihhtf3819, confidence 0.5) was off by 10× due to a mA/cm² → mA/m² unit-conversion error — corrected in Wave 1.5 (codex P1).
1.20
A/m²
0.95
A/m²
-21.2%green
Coulombic efficiency
System-level Coulombic efficiency over the 31-h desalination cycle. CE ≈ 9% is low (vs ~60% MFC ferricyanide ceiling) because the algae-cathode ORR is rate-limited by dissolved-O₂ supply and a fraction of anode current flows to crossover / dark-phase respiration sinks. Anchors the biocathode-CE regime against Yousif 2021 aqueous CE (5.94%) and Cao 2009 ferricyanide CE (~60%).
DB extraction (confidence 0.8, paperId cmcv8hx95049h1yhihhtf3819): coulombicEfficiency = 9% (abstract: "coulombic efficiency was 9%"). The 60.15% extraction is the cathodic faradaic efficiency, not system CE.
9.00
%
10.9
%
+21.1%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 (6 items)
  1. Wave 1.5 unit-conversion correction (2026-05-22, codex P1): reportedValue changed from 0.12 → 1.2 A/m². The original DB extraction (120 mA/m²) was off by 10× due to a mA/cm² ↔ mA/m² unit-conversion error; the paper abstract reports 0.12 mA/cm² = 1.2 A/m² (verified via OpenAlex API). Same class of mistake as the BIOCTANE `_3.csv` mA→A/m² fix in an adjacent sweep.
  2. Anchors the biocathode-ALGAE sub-regime (`cathode_microbe: algae`). The biocathode branch is split into two sub-regimes because algae-driven photosynthetic ORR (~1 A/m²) and immobilised-enzyme ORR (~0.1 A/m²) span ~13× — too wide for a single Rint multiplier under the ±25% Logan-Regan gate.
  3. Anchor on `current_areal` and `coulombic`, not `power_areal`. Paper reports 0.11 kWh/m³ electric power generated; converting to areal mW/m² requires the chamber volume + cycle time + electrode area — none cleanly reported. The C. vulgaris 2019 sister-anchor covers the power_areal anchor for this sub-regime.
  4. Closest closure cathode-catalyst label is `none` (no Pt loading); the algae provides the ORR. The `cathode_type: biocathode` + `cathode_microbe: algae` pair is the dominant lever; cathode_catalyst matters less for biocathodes.
  5. The 9% CE is anomalously low even for biocathode MDCs and reflects the dissolved-O₂-limited electron sink kinetics. We accept it as the literature-reported anchor; the closure CE multiplier (algae sub-regime, calibrated to mixed_anaerobic base 0.35) lands in-band.
  6. Salt removal anchor omitted: 77.37% reported is a single-cycle batch number tied to the specific chamber volume / cycle time / starting salinity combination, not a steady-state plateau. Cao 2009 + Mohan 2022 cover the salinity-saturation anchors; the biocathode branch does NOT modify the tanh salt-removal fit.
Source mix
EMP 0CAL 0SIM 12EXT 0
Peak power density
290mW/m²✓ mass-bal
at x = 231 · n=0 nearby papers
Coulombic efficiency
10.9%
mixed-culture realistic range 20-55%
Internal resistance
2852Ω·cm²
area-normalized; Logan-group standard
Empirical coverage
0.92@ 95%
n=52 · ECE 0.03 · small-n fold-back
SHOW
-462.98-295.65-128.3239.0120637410.0200840066004800210000Power density (areal) (mW/m²)external_resistance (Ω)x=10 · Power density (areal)=-407.2 mW/m² · SIMULATED · 0 nearby papersx=18.7 · Power density (areal)=-268.9 mW/m² · SIMULATED · 0 nearby papersx=35.1 · Power density (areal)=-83.4 mW/m² · SIMULATED · 0 nearby papersx=65.8 · Power density (areal)=112.4 mW/m² · SIMULATED · 0 nearby papersx=123 · Power density (areal)=251.4 mW/m² · SIMULATED · 0 nearby papersx=231 · Power density (areal)=290 mW/m² · SIMULATED · 0 nearby papersx=433 · Power density (areal)=248 mW/m² · SIMULATED · 0 nearby papersx=811 · Power density (areal)=177.4 mW/m² · SIMULATED · 0 nearby papersx=1520 · Power density (areal)=114 mW/m² · SIMULATED · 0 nearby papersx=2850 · Power density (areal)=68.8 mW/m² · SIMULATED · 0 nearby papersx=5340 · Power density (areal)=40.1 mW/m² · SIMULATED · 0 nearby papersx=10000 · Power density (areal)=22.9 mW/m² · SIMULATED · 0 nearby papers◆ optimum290.0 mW/m² @ 231