1. What is MLVSS?

MLVSS (Mixed Liquor Volatile Suspended Solids) is a measure of the concentration of microorganisms in the activated sludge process. It represents the biologically active portion of the mixed liquor suspended solids (MLSS).

2. How Does the Calculator Work?

The calculator uses the MLVSS equation:

Where:

• \( Volatile\ Solids \) — Organic portion of solids (g/L)
• \( Total\ Solids \) — Total suspended solids (g/L)
• \( MLSS \) — Mixed liquor suspended solids (g/L)

Explanation: The equation calculates the biologically active portion of the MLSS by determining the ratio of volatile solids to total solids.

3. Importance of MLVSS Calculation

Details: MLVSS is crucial for monitoring and controlling the activated sludge process in wastewater treatment plants. It helps determine the appropriate food-to-microorganism ratio (F/M ratio) and assess the health of the biological treatment system.

4. Using the Calculator

Tips: Enter all values in g/L. Volatile solids and total solids should be measured from the same sample. All 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 in the mixed liquor, while MLVSS measures only the volatile (organic) portion that represents active biomass.

Q2: What are typical MLVSS values?
A: Typical MLVSS values range from 1,500 to 4,000 mg/L (1.5-4.0 g/L) in conventional activated sludge systems.

Q3: How often should MLVSS be measured?
A: MLVSS should be measured daily to weekly in most wastewater treatment plants to monitor process performance.

Q4: What affects MLVSS values?
A: MLVSS is affected by wastewater characteristics, sludge age, temperature, and aeration conditions.

Q5: How does MLVSS relate to F/M ratio?
A: F/M ratio is calculated using MLVSS as it represents the active biomass available to consume the incoming food (BOD).