<P> The portion of the MLSS that is actually eating the incoming food is referred to as the Mixed Liquor Volatile Suspended Solids (MLVSS). The volatile solids concentration in a sample of mixed liquor will consist mostly of microorganisms and organic matter . As a result, the volatile solids concentration of mixed liquor is approximately equal to the amount of microorganisms in the water and can be used to determine whether there are enough microorganisms present to purify the water . </P> <P> MLSS is separated from the treated or purified water by settling in a settling tank in the activated sludge process . The excess sludge has to be removed from the system . </P> <Ul> <Li> The process is prone to bulking of solids and the treatment system can become overloaded . </Li> <Li> This can cause the dissolved oxygen content to drop; this may reduce the efficiency of nitrification and the settleability of the sludge . </Li> <Li> Excessive aeration will be required which wastes electricity . </Li> </Ul> <Li> The process is prone to bulking of solids and the treatment system can become overloaded . </Li>

What is the difference between mlss and mlvss