What is VSS and TSS?

What is VSS and TSS?

Concentration measuring methods include the total-suspended solids (TSS) method, which measures solids concentration in activated-sludge samples. The volatile suspended solids (VSS) method is a rough measure of solids concentration in samples of activated sludge derived by measuring volatile solids.

How is VSS measured?

Unsourced material may be challenged and removed. Volatile suspended solids (VSS) is a water quality measure obtained from the loss on ignition of the mass of measured total suspended solids. This ignition generally takes place in an oven at a temperature of 550 °C to 600 °C.

What does VSS stand for in wastewater?

Biological Solids: Biological solids are generated during the aerobic/anaerobic treatment process and are termed Volatile Suspended Solids (VSS). VSS are organic in nature and by definition will ignite at 550 °C in a muffle furnace.

What is the difference between TSS and MLSS?

Mixed Liquor Suspended Solids MLSS is a testing measures the total concentration of mixed liquor suspended (non-soluble) solids in the aeration basin of an activated sludge system. VSS should represent the biomass concentration, TSS is the total suspended solids, of which part is the biomass.

What is VSS test?

TSS testing measures the total concentration of suspended (non-soluble) solids in the aeration stabilization basin (ASB) or in effluents. It is usually a permitted test and solids must be kept at a minimum. …

What is Mbbrs MLSS?

The MBBR technology is a robust attached growth biological wastewater treatment that is less expensive than conventional biological treatment. This makes for an easy-to-operate, efficient, biological wastewater treatment that does not require any recirculation of the mixed liquor suspended solids (MLSS).

What causes COD in wastewater?

COD increases as the concentration of organic material increases. It also increases if inorganic compounds susceptible to oxidation by the oxidant (typically dichromate) are present. Water with high COD typically contains high levels of decaying plant matter, human waste, or industrial effluent.

What is the VSS test for suspended solids?

After the total suspended solids value is determined a volatile suspended solids (VSS) test may be performed in order to determine the concentration of volatile suspended solids in an aeration stabilization basin system.

What is the difference between total solids and volatile solids?

Total Solids, Volatile Solids Total Solids (TS)= Dry matter content of substrate Inverse of moisture content one of the most variable parameters between substrates water Volatile Solids (VS)= Combustible proportion of TS, organic matter

What is the temperature for total suspended solids?

The filter used for total suspended solids (TSS) testing is ignited at 550 °C for 30 minutes. The weight loss on ignition of the solids represents the volatile solids in the sample.

Why are floating particles excluded from total suspended solids?

Large floating particles or submerged agglomerates of nonhomogeneous materials from the sample may be excluded in the total suspended solids measurements if it is determined that their inclusion is not representative of the entire sample. The size of sampling should also be limited to a size the yields no more than 200 mg residue.

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