Sludge Production
Calculate the biological sludge production of a plant, P_x = Y × ΔS ÷ 1000 × Q, multiplying the cell yield coefficient (Y, kg VSS/kg BOD), the BOD removed (mg/L) and the flow (m³/day). The result, in kg/day, estimates the excess sludge mass generated by biomass growth, key to sizing wasting, thickening, dewatering and final disposal — a step that often drives much of a treatment plant's operating cost. Enter the yield Y, the BOD removed and the flow.
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Produção de lodo
Todo tratamento biológico transforma parte da matéria orgânica removida em nova biomassa — bactérias que crescem e precisam ser periodicamente retiradas como lodo excedente. Estimar quanto lodo se produz por dia é fundamental, porque o gerenciamento do lodo (adensamento, digestão, desidratação e disposição final) costuma responder por boa fatia do custo operacional de uma ETE. A forma simplificada é P_x = Y × ΔS ÷ 1000 × Q: o coeficiente de produção celular Y (kg de sólidos suspensos voláteis gerados por kg de DBO removida, tipicamente 0,4–0,8) multiplica a DBO removida ΔS (mg/L, convertida para kg/m³) e a vazão Q (m³/dia). O resultado, em kg/dia, é a massa de lodo biológico gerada. Sistemas de alta idade do lodo (como aeração prolongada) produzem menos lodo, porque a respiração endógena consome parte da biomassa; sistemas de alta carga produzem mais. Esse valor define o porte dos adensadores, das centrífugas ou filtros-prensa e a logística de destinação do lodo. Informe o coeficiente Y, a DBO removida e a vazão.
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Oxygen Requirement (Aeration)
Calculate the oxygen requirement of an aerobic treatment system, O₂ = Q × ΔS ÷ 1000 × f, multiplying the flow (m³/day) by the BOD removed (mg/L) and an oxygen-demand factor (typically 1.0–1.5 kg O₂/kg BOD). The result, in kg O₂/day, sizes blowers and aerators in activated sludge and aerated lagoons, ensuring enough oxygen for the biological oxidation of organic matter. Enter the flow, the BOD removed and the oxygenation factor.
Sludge Recycle Ratio
Calculate the sludge recycle ratio (R) of an activated-sludge system by mass balance, R = X ÷ (X_r − X), from the mixed-liquor suspended solids (MLSS) and the return sludge concentration. The result (dimensionless, or ×100%) gives the fraction of influent flow that must be recycled from the secondary clarifier to keep the desired biomass in the reactor. Typical ratios range from 0.25 to 1.0. Enter the reactor MLSS and the return sludge concentration.
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The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.