National standard method for determining sludge concentration

The most accurate method is the weight method, which is to take a certain volume or weight of sludge, filtered with a known weight of filter cloth or filter paper, the filter residue together with the filter paper at 100-120 degrees Celsius all dry, weigh the dry weight, and then subtract the weight of the filter paper is the net weight of dry residue, and finally divided by the total weight or total volume of sludge, to get the sludge mass than the concentration of the weight ratio or weight than the concentration. The sludge mass percentage concentration is calculated as:

Sludge mass concentration (%) == net weight of dry residue/gross weight of sludge*100