Start with the wastewater that will actually reach the plant, not a generic capacity per resident, room or workstation. A daily-flow calculation is the starting point for a design assessment, not a complete equipment selection.
The short answer
1 KLD equals 1000 litres/day. Sum actual measured or designer-approved wastewater flows in litres/day and divide by 1000. The designer must separately confirm wastewater suitability, peak flows, operating hours, treatment requirements and future capacity.
KLD means kilolitres per day: 1 KLD equals 1000 litres/day. List every wastewater stream entering the proposed STP, sum its actual measured or designer-approved daily volume in litres/day, then divide the total by 1000. Avoid counting the same flow twice. This establishes a daily-flow basis, not the final plant selection; ask the designer to confirm loading, treatment stages and hydraulic requirements.
Provide available wastewater measurements, their measurement period, occupancy records, operating hours and a list of connected sources. Where measurements are unavailable, ask the designer to approve and document the assumptions rather than applying a universal per-person rate. Water-supply consumption should not automatically be treated as sewage flow. Identify which water uses reach the STP and whether the records represent normal and busy operating conditions.
For arithmetic only, assume measured apartment wastewater totals 30000 litres/day from residences plus 5000 litres/day from separately measured shared facilities. The total is 30000 + 5000 = 35000 litres/day; dividing by 1000 gives 35 KLD. These assumed measurements are not recommended capacities or per-resident allowances. Confirm that shared flows are not already included, and have the designer assess occupancy variation, wastewater characteristics and treatment requirements.
For illustration, assume measured wastewater is 20000 litres/day from guest accommodation, 3000 from staff facilities and 7000 from kitchen and laundry streams proposed for inclusion. Then 20000 + 3000 + 7000 = 30000 litres/day = 30 KLD. This is hypothetical arithmetic, not a recommended hotel capacity. The designer must assess stream suitability, any pretreatment, occupancy variation and concentrated kitchen or laundry discharges before selecting equipment.
Assume, solely for this example, measured office sanitary wastewater across all shifts is 8000 litres/day and separately measured pantry and cleaning wastewater is 2000 litres/day. The calculation is 8000 + 2000 = 10000 litres/day = 10 KLD. This is not a recommended office capacity. Record shift overlaps and discharge timing; the designer must assess whether the operating pattern requires particular hydraulic arrangements or equalisation.
No universal multiplier follows from these examples. Daily volume does not describe the maximum incoming flow or how much sewage arrives during limited operating hours. Ask the designer to assess peak hydraulic loading, equalisation, process operating hours and future expansion separately, documenting any allowance. Published separator toilet counts or instantaneous flow ratings are not a method for converting building occupancy into complete-plant daily capacity.
Request a written flow worksheet, measurement sources or approved assumptions, wastewater characteristics, peak-flow assessment and intended discharge or reuse targets. The proposal should explain how these inputs determine the complete treatment arrangement, not just the separator quantity. Obtain a layout, equipment scope, testing plan and maintenance responsibilities. Compare suppliers on the same design basis, and require a site assessment before accepting technical eligibility or capacity.
Based on the product process, specifications, service scope and indicative comparisons already published by India Water Systems. Product claims and example results are not independent certification or a substitute for a site assessment.
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