Indoor RAS discharge screen: seven parameters, a PROCEED call, human-gated (illustrative)
A 600 t/yr indoor tilapia RAS asked a two-part question — does the effluent meet Singapore PUB Trade Effluent limits, and does the ROI support a go-ahead? AquaMind V2 screened all seven declared parameters as passing, computed the investment economics, and returned a PROCEED recommendation — flagged tier-5 and held for mandatory human sign-off before any business decision. Illustrative compliance screen on a fictional facility, not a legal determination.
Summary
AquaMind V2 restated the project (indoor RAS, ~600 t/yr tilapia, treated effluent to public sewer, Singapore PUB/NEA), screened the declared effluent against the SG PUB Trade Effluent parameters, weighed the investment case, and produced a decision brief. Because a business-decision recommendation is always tier-5 under the AquaMind safety order, the output is explicitly held for human sign-off and does not auto-execute.
Findings
Compliance posture — screens as compliant
All seven declared parameters — TAN, TN, TP, BOD, TSS, pH and temperature — return pass verdicts against the PUB Trade Effluent limits, with comfortable margins on most (TAN 0.8 vs 5.0 mg/L; BOD 18 vs 50 mg/L). TSS (22 vs 50) and BOD margins are moderate rather than wide and warrant periodic re-testing as biomass scales.
Investment economics
On the declared capex/opex/revenue assumptions the case shows an NPV near US$2.84M, an IRR around 25% and a payback near 3.6 years against an 8% discount rate over a 10-year horizon — favourable, though no driver-sensitivity was supplied.
What the screen is — and is not
This is a compliance posture screen against declared values and an ROI weighing, not an adjudicated legal verdict. Data provenance and standards currency remain human-review items — which is exactly why the decision is HITL-gated.
Treatment plan
- 01
Recommended decision — PROCEED (subject to sign-off)
Proceed with the indoor RAS capex, conditioned on the follow-up diligence below. The recommendation carries requires_human_signoff and does not auto-execute.
- 02
Follow-up diligence
Confirm data provenance on the declared effluent values, add ROI driver-sensitivity (feed cost, fish price, energy), and re-test TSS/BOD margins as production ramps.