In this guide
This article explains the treatment objective, the design information that matters and the operating checks that help keep the system practical after installation.
Define the design basis first
Source-water analysis, seasonal variation, design flow, peak flow, operating hours and the required product-water quality together form the design basis. Skipping this step and starting from equipment selection tends to produce an over- or under-specified plant.
Select only the stages the water actually needs
Clarification, multimedia filtration, softening, activated carbon, membranes and disinfection each solve a different water-quality problem. A treatment train should include the stages that address the specific raw-water issues identified in testing — adding stages the water doesn't need increases cost and maintenance without improving outcomes.
Sizing follows flow and operating pattern, not just daily demand
Peak hourly flow, not just average daily demand, typically governs equipment and pipe sizing. A plant designed only around a daily total figure can be undersized during periods of concentrated demand unless storage is used to buffer the difference.
Plan utilities and waste streams from the start
Pumps, power supply, backwash water demand, chemical storage and dosing, sludge or reject handling, and drainage all influence whether a plant is practical to operate — these need to be part of the design conversation from the beginning, not addressed after equipment is already selected.
Commissioning and operator training complete the process
A correctly designed and installed WTP still needs proper commissioning — verifying each stage performs as intended under real operating conditions — and operator familiarity with startup, shutdown, backwash and routine monitoring procedures before it can be considered handed over.
Need a treatment recommendation for your water?
Send the water source, intended use, approximate demand and any available test report. Waterwise Bangladesh can review the requirement and discuss an appropriate treatment approach.