Number Of Coliform Organisms At Any Initial Time Calculator

Formula Used:

\[ \text{Number of Coliform} = \frac{\text{Number of Coliform at Initial Time}}{(1 + 0.23 \times \text{Chlorine Residual} \times \text{Residence Time})^{-3}} \]

Number of Coliform at Initial Time (Nt):

colonies

Chlorine Residual (Ct):

kg/m³

Residence Time (t):

seconds

Number of Coliform (N0):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Number of Coliform Organisms Calculation?

The Number of Coliform Organisms calculation estimates the initial number of coliform bacteria present in a water sample based on chlorine residual and contact time. This is important for assessing the effectiveness of water disinfection processes.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ N_0 = \frac{N_t}{(1 + 0.23 \times C_t \times t)^{-3}} \]

Where:

\( N_0 \) — Number of Coliform at initial time (colonies)
\( N_t \) — Number of Coliform at measurement time (colonies)
\( C_t \) — Chlorine Residual (kg/m³)
\( t \) — Residence Time (seconds)
0.23 — Empirical coefficient
-3 — Exponential factor

Explanation: The formula models the disinfection kinetics where coliform bacteria reduction follows a power-law relationship with chlorine concentration and contact time.

3. Importance of Coliform Calculation

Details: Accurate estimation of coliform organisms is crucial for water quality assessment, disinfection system design, and regulatory compliance in water treatment processes.

4. Using the Calculator

Tips: Enter the number of coliform colonies, chlorine residual in kg/m³, and residence time in seconds. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are coliform bacteria?
A: Coliform bacteria are a group of bacteria commonly found in the environment and feces, used as indicators of water contamination and treatment effectiveness.

Q2: Why is chlorine residual important?
A: Chlorine residual indicates the amount of disinfectant remaining in water to maintain microbial safety throughout the distribution system.

Q3: What is residence time in disinfection?
A: Residence time refers to the duration that water remains in contact with the disinfectant, crucial for effective pathogen inactivation.

Q4: Are there limitations to this formula?
A: This empirical formula may have limitations with varying water quality parameters, temperature effects, and different microorganism types.

Q5: How accurate is this calculation?
A: The calculation provides an estimate based on empirical relationships. For precise measurements, laboratory testing and additional factors should be considered.