1. What is Percent Solids given Weight Flow Rate of Sludge Feed?

Definition: This calculator determines the percentage of solids in sludge based on weight flow rate, volume flow rate, water density, and specific gravity of sludge.

Purpose: It helps wastewater treatment professionals analyze sludge composition and optimize treatment processes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \%S \) — Percent solids (decimal)
• \( W_s \) — Weight flow rate of sludge feed (lb/hr)
• \( V \) — Volume flow rate of sludge feed (gal/min)
• \( \rho_{water} \) — Water density (lb/ft³)
• \( G_s \) — Specific gravity of sludge

Explanation: The formula converts weight flow to volume flow and calculates the solids percentage based on sludge properties.

3. Importance of Percent Solids Calculation

Details: Accurate solids percentage helps in determining sludge treatment requirements, dewatering efficiency, and disposal methods.

4. Using the Calculator

Tips: Enter weight flow rate (lb/hr), volume flow rate (gal/min), water density (default 62.4 lb/ft³), and specific gravity (default 2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for percent solids in sludge?
A: Typically 0.5-7% for primary sludge, 0.5-2% for waste activated sludge.

Q2: Why is specific gravity important?
A: It accounts for the density difference between sludge and water.

Q3: What if I have metric units?
A: Convert to the required units (lb/hr, gal/min, lb/ft³) before calculation.

Q4: What does the 7.48 factor represent?
A: It's the conversion factor from cubic feet to gallons (7.48052 gal/ft³).

Q5: How accurate is this calculation?
A: It provides a good estimate but actual values may vary based on sludge composition.