Suspended solids (SS) in papermaking wastewater refer to the content of filterable substances with a diameter greater than 0.45 microns. The determination method is as follows:
Take a certain amount of sample: According to the suspended matter content of the sample and the sensitivity of the measurement, take an appropriate amount of wastewater sample, usually between 50-1000 ml.
Filtration: Use a filter to filter the wastewater sample. The pore size of the filter is 0.45 micron, which can filter out the suspended matter with a diameter greater than 0.45 micron, and only retain the dissolved matter smaller than 0.45 micron.
Drying: Dry the filtered membrane at 105°C until constant weight.
Weighing: Put the filter membrane into a constant weight bottle and weigh to obtain the mass of the filter membrane.
Calculate the content of suspended matter: use the following formula to calculate the content of suspended matter:
SS (mg/L) = (membrane mass - constant weight bottle mass) / sampling volume
North and South Chao reminds you: Before filtering, the sample needs to be shaken well to ensure that the suspended matter is evenly distributed. At the same time, care should be taken to avoid contamination by external impurities during the measurement.
