Design rules for ETP / STP
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ETP / STP
Tank volume: V = Q x HRT (equalisation 8–12 h)200 KLD x 12 h → 100 m³Oxygen: ≈ 1.5 kg O2 per kg BOD removedClarifier area = Q / SOR (20–24 m³/m²/day)Filter area = Q / rate (10–12 m³/m²/h)RO: permeate = feed x recovery (≈75%)
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Calculators: Primary Treatment calculator · Biological / MBBR calculator · Clarifier calculator · Tertiary (PSF/ACF) calculator · RO / ZLD calculator · Sludge Handling calculator · STP (Domestic) calculator
Catalogue categories: Pumps, Blowers, Filters, RO Systems, Chemicals
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Standards cited by number for reference; verify designs with a qualified engineer.