**Protocol Outline** 1. **Define Objectives & KPIs** - CO₂ removal rate (kg CO₂/m³‑d) - Biofuel yield (L biofuel/kg biomass) - Biomass productivity (g DW/m²‑d) 2. **Create Spreadsheet Model** - Columns: Day, Influent COD, Influent BOD, Algae Biomass (g DW/m²), CO₂ uptake (kg CO₂/m³), Biofuel (L), Residuals. - Use formulas for mass balance: CO₂₍out₎ = CO₂₍in₎ − CO₂₍uptake₎ Biomass₍new₎ = Biomass₍old₎ + Growth − Harvest. - Sensitivity analysis: vary light intensity, temperature, N:P ratio. - Insert control group data (no algae) for baseline. 3. **Lab‑Scale Setup (pilot)** - Reactor: 50 L photobioreactor, flat‑panel, transparent. - Inoculum: 10 g DW/L engineered strain. - Feed: Synthetic wastewater matching model’s COD/BOD. - Lighting: LED, 200 µmol m⁻² s⁻¹, 16 h photoperiod. - Aeration: 1 vvm, sparge to keep CO₂ dissolved. - Temperature: 25 °C, monitor with sensor. 4. **Sampling & Data Logging** - Daily: measure CO₂ partial pressure, pH, dissolved oxygen, biomass optical density (OD₇₅₀). - Weekly: dry weight, lipid extraction for biofuel potential. - Input data into spreadsheet real‑time (Google Sheets API or Excel macros). 5. **Harvest & Biofuel Extraction** - Every 7 days: centrifuge 10 L, dry, extract lipids with hexane. - Convert lipids to biodiesel via transesterification (methanol + NaOH). - Quantify product volume, energy density. 6. **Control Group** - Run identical reactor without algae, same feed, same aeration. - Use data for comparison in spreadsheet: CO₂ removal, residual COD/BOD. 7. **Iterate** - Update model parameters with pilot data. - Optimize light, CO₂ supply, nutrient mix. - Document every tweak: variable, value, outcome. 8. **Safety & QC** - Keep lab notebooks. - Verify strain identity by PCR after each harvest. - Dispose of wastewater according to regulations. Follow the spreadsheet, keep variables tidy, and let the data drive the next tweak.

Thanks for the pointers. I’ll switch to a 1:1 blue:red LED mix and log the spectrum intensity. pH drift will be flagged by the pH probe and I’ll titrate with NaOH if it falls below 6.5. I’ll run the N:P ratio at 20:1 first, then adjust upward if the growth plateaus. Will ping you after the week. Good luck to us both.

Got it, will log spectrum changes and growth rate side‑by‑side. Expect a boost if the blue dominates. 20:1 N:P will be my baseline. I’ll keep the pH check tight and report any anomalies. Stay safe, and I’ll ping you once the data stabilizes.

Got it, will keep you in the loop as soon as the data stabilizes. Stay safe, too.

Will do, keep the data clean and the variables tight. Stay safe.