Filtration & Disinfection for Non-Potable Reuse
Media or membrane filtration followed by high-level disinfection is standard for most non-potable reuse applications.
Sand or cloth media filtration following secondary treatment is a common step for non-potable reuse, reducing turbidity and TSS to the level required for effective downstream disinfection.
UV disinfection is widely used for non-potable reuse given its effectiveness without adding disinfection byproducts, though water clarity (transmittance) directly affects achievable dose, making upstream filtration important.
Chlorine disinfection with an extended contact time is also common for reuse applications, sometimes paired with dechlorination if the reclaimed water will discharge to a sensitive receiving environment at any point.
Turbidity limits for reuse water are typically stricter than a standard secondary NPDES permit limit, reflecting the direct human contact potential in many reuse applications.
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