Contaminant Removal Efficiency Calculator

ANA›Life Services Authority›National Calculator Authority›Contaminant Removal Efficiency Calculator

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Contaminant Removal Efficiency Calculator

Calculate the percentage removal efficiency of contaminants in water treatment, air filtration, or industrial purification systems based on influent and effluent concentrations.

Influent Concentration (Cin)

mg/L μg/L ppm ppb mg/m³ μg/m³ NTU (turbidity) CFU/mL (microbial)

Effluent Concentration (Cout)

mg/L

Flow Rate (Q) (optional — for mass load)

L/s L/min m³/hr m³/day MGD (million gal/day)

Number of Treatment Stages

Calculate

(function() { // Sync effluent unit label with influent unit selector document.getElementById('con-unit').addEventListener('change', function() { document.getElementById('con-effluent-unit').textContent = this.value; });

// Flow rate conversion to L/s function toLS(value, unit) { const factors = { 'L/s': 1, 'L/min': 1/60, 'm³/hr': 1000/3600, 'm³/day': 1000/86400, 'MGD': 1e6 * 3.78541 / 86400 }; return value * (factors[unit] || 1); }

// Concentration unit label for mass load output function massUnit(concUnit) { const map = { 'mg/L': 'g/s', 'μg/L': 'mg/s', 'ppm': 'g/s', 'ppb': 'mg/s', 'mg/m³': 'mg/s', 'μg/m³': 'μg/s', 'NTU': 'NTU·L/s', 'CFU/mL': 'CFU/s' }; return map[concUnit] || ''; }

// Concentration to mg/L equivalent for mass calc (approximate) function concToMgL(value, unit) { const factors = { 'mg/L': 1, 'μg/L': 0.001, 'ppm': 1, 'ppb': 0.001, 'mg/m³': 0.001, 'μg/m³': 0.000001, 'NTU': 1, 'CFU/mL': 1 }; return value * (factors[unit] || 1); }

window.conCalc = function() { const resultDiv = document.getElementById('con-result'); resultDiv.style.display = 'block';

const cin = parseFloat(document.getElementById('con-influent').value); const cout = parseFloat(document.getElementById('con-effluent').value); const unit = document.getElementById('con-unit').value; const flowRaw = parseFloat(document.getElementById('con-flow').value); const flowUnit = document.getElementById('con-flow-unit').value; const stages = parseInt(document.getElementById('con-stages').value) || 1;

// --- Validation --- if (isNaN(cin) || cin ⚠ Please enter a valid influent concentration (≥ 0).'; return; } if (isNaN(cout) || cout ⚠ Please enter a valid effluent concentration (≥ 0).'; return; } if (cin === 0) { resultDiv.innerHTML = '⚠ Influent concentration cannot be zero (division by zero).'; return; } if (cout > cin) { resultDiv.innerHTML = '⚠ Effluent concentration cannot exceed influent concentration. Check your values.'; return; } if (stages 10) { resultDiv.innerHTML = '⚠ Number of stages must be between 1 and 10.'; return; }

// --- Core Calculations --- // Overall removal efficiency const RE = ((cin - cout) / cin) * 100;

// Log removal value (LRV) — common in water/air treatment const LRV = Math.log10(cin / cout);

// Per-stage efficiency (assuming equal stages in series) // For n equal stages: RE_stage = 1 - (1 - RE_overall/100)^(1/n) const RE_stage = (1 - Math.pow(1 - RE / 100, 1 / stages)) * 100;

// Concentration factor remaining const CF = cout / cin;

// Mass load removed (if flow provided) let massHTML = ''; if (!isNaN(flowRaw) && flowRaw > 0) { const Q_ls = toLS(flowRaw, flowUnit); const cin_mgl = concToMgL(cin, unit); const cout_mgl = concToMgL(cout, unit); const massIn = cin_mgl * Q_ls; // mg/s const massOut = cout_mgl * Q_ls; const massRem = massIn - massOut; const mUnit = massUnit(unit); massHTML = Influent Mass Load**${massIn.toFixed(4)} ${mUnit}** Effluent Mass Load**${massOut.toFixed(4)} ${mUnit}** Mass Removed**${massRem.toFixed(4)} ${mUnit}**; }

// --- Efficiency rating label --- let rating = ''; if (RE >= 99.9) rating = '🟢 Excellent (≥99.9%)'; else if (RE >= 99) rating = '🟢 Very High (≥99%)'; else if (RE >= 90) rating = '🟡 High (≥90%)'; else if (RE >= 75) rating = '🟡 Moderate (≥75%)'; else if (RE >= 50) rating = '🟠 Low-Moderate (≥50%)'; else rating = '🔴 Low ( Influent Concentration (Cin)${cin} ${unit} Effluent Concentration (Cout)${cout} ${unit}

Removal Efficiency (RE) ${RE.toFixed(4)} %

Log Removal Value (LRV)${LRV.toFixed(3)} log Concentration Fraction Remaining${(CF * 100).toFixed(4)} % Treatment Stages${stages} Per-Stage Efficiency (equal stages)${RE_stage.toFixed(4)} % ${massHTML} Performance Rating${rating} `; }; })();

#### Formulas Used

Removal Efficiency (RE):

RE (%) = [(Cin − Cout) / Cin] × 100

Log Removal Value (LRV):

LRV = log10(Cin / Cout)

Per-Stage Efficiency (n equal stages in series):

REstage (%) = [1 − (1 − RE/100)1/n] × 100

Mass Load Removed:

Mass Removed = (Cin − Cout) × Q

Where: Cin = influent concentration, Cout = effluent concentration, Q = volumetric flow rate, n = number of treatment stages.

#### Assumptions & References

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References

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