1. What is MLVSS?

MLVSS (Mixed Liquor Volatile Suspended Solids) represents the concentration of microorganisms in the activated sludge process. It's a key parameter for monitoring and controlling wastewater treatment systems.

2. How Does the Calculator Work?

The calculator uses the MLVSS formula:

Where:

• \( MLSS \) — Mixed Liquor Suspended Solids (mg/L)
• \( \%volatile \) — Percentage of volatile solids in MLSS

Explanation: The formula calculates the biologically active portion of the mixed liquor by multiplying total suspended solids (MLSS) by the volatile fraction.

3. Importance of MLVSS Calculation

Details: MLVSS is crucial for determining the appropriate food-to-microorganism (F/M) ratio, assessing biomass health, and optimizing aeration tank performance in wastewater treatment plants.

4. Using the Calculator

Tips: Enter MLSS in mg/L and % volatile solids (typically 60-80% for healthy activated sludge). Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between MLSS and MLVSS?
A: MLSS measures all suspended solids, while MLVSS measures only the volatile (organic) portion that represents active biomass.

Q2: What are typical MLVSS values?
A: Typical range is 1,500-4,000 mg/L for conventional activated sludge systems, depending on process design.

Q3: How often should MLVSS be measured?
A: Daily monitoring is ideal for process control, though many plants test 2-3 times per week.

Q4: What affects the % volatile solids?
A: Factors include sludge age, aeration, influent characteristics, and presence of inert materials.

Q5: Can MLVSS be too high?
A: Yes, excessive MLVSS can lead to poor settling, increased oxygen demand, and higher sludge production.