FL Water Operator cheat sheet

Conventional treatment sequence: coagulation destabilizes particles, flocculation grows floc, sedimentation removes settleable floc, filtration removes remaining particles, and disinfection inactivates pathogens.

Rapid mix disperses coagulant quickly; flocculation uses gentle, tapered mixing so floc grows without being sheared apart.

Surface loading rate = clarifier flow ÷ clarifier surface area; it is expressed as gpm/ft² or m³/m²·d.

Detention time = tank volume ÷ flow rate; convert volume and flow to consistent units before calculating hours or minutes.

CT = disinfectant residual (mg/L) × effective contact time (min); higher CT indicates greater inactivation potential for a susceptible pathogen.

A jar test simulates coagulation, flocculation, and settling at bench scale to select coagulant dose and target pH.

Breakpoint chlorination is the chlorine dose at which demand is satisfied and free chlorine residual begins to rise.

Filter backwash is complete when the bed is expanded adequately and washwater turbidity clears; excessive rates can lose media.

Flow equation: Q = A × V; flow equals pipe cross-sectional area times velocity, with consistent units.

Hazen-Williams head loss increases with flow^1.852 and pipe length, and decreases sharply as pipe diameter^4.87 increases.

Water hammer is a pressure surge from sudden velocity change; slow valve closure, air chambers, and surge tanks reduce it.

Distribution systems are operated to maintain positive pressure and detectable disinfectant residual; exact limits are set by rule and permit.

An air gap provides the highest backflow protection; RPZ, pressure vacuum breaker, and double-check assemblies are used where approved.

Dead-end mains stagnate; looping and flushing reduce sediment, old water, and disinfectant decay.

Thrust blocks or restrained joints resist unbalanced pressure forces at bends, tees, and dead ends.

Storage tanks need turnover and screened vents and overflows to prevent stagnation and contamination.

Affinity laws at constant impeller diameter: Q ∝ N, H ∝ N², and P ∝ N³.

Water horsepower = (gpm × total head in ft) ÷ 3960; brake horsepower = water horsepower ÷ pump efficiency.

NPSH available must exceed NPSH required; inadequate margin causes cavitation.

Cavitation signs include gravel-like noise, vibration, falling flow or head, and impeller pitting.

Centrifugal pumps must be primed; running dry can damage seals and cause overheating.

Parallel pumps increase total flow; series pumps increase total head.

Voltage and current imbalance can overheat motors; bearing temperature and vibration trends reveal misalignment or wear.

Lockout/tagout isolates hazardous energy before repair; verify zero energy before work.

pH controls chlorine speciation: HOCl dominates at lower pH and is a stronger disinfectant than OCl⁻, which dominates at higher pH.

Turbidity shields microbes and exerts chlorine demand; filtered-water turbidity is a key treatment performance indicator.

Bacteriological sample bottles contain sodium thiosulfate to neutralize chlorine; they must remain sterile and be analyzed within holding time.

DPD reagent measures free and total chlorine; combined chlorine = total chlorine − free chlorine.

Collect samples from a flushed tap, avoid aerators and swivel joints, and record chlorine residual at the time of collection.

Chlorine demand = applied chlorine dose − residual chlorine after contact time.

CT combines disinfectant concentration and contact time; effective CT depends on pH, temperature, and pathogen type.

Holding times and preservation methods are method-specific; label containers and refrigerate as required.

Florida drinking water regulations are administered by the Florida Department of Environmental Protection under the federal Safe Drinking Water Act.

Tier 1 public notice is for immediate health-risk situations and is issued as soon as possible, generally within 24 hours; Tier 2 within 30 days; Tier 3 within one year.

Community water systems deliver an annual Consumer Confidence Report summarizing source water, contaminants, and compliance.

Confined-space entry requires atmospheric testing, ventilation, an attendant, and a permit before entry.

Chlorine gas release response includes evacuation, notification, and use of SCBA; never enter the area without appropriate respiratory protection.

Safety Data Sheets provide chemical hazard, first-aid, handling, and spill information and must be accessible to employees.

Operating records include flows, disinfectant residuals, chemical doses, maintenance, and laboratory results; they support compliance and troubleshooting.

Lockout/tagout and personal protective equipment are required when servicing energized or hazardous equipment.