Measurement of suspended solids in wastewater

Summary

Suspended solid (Sespended solid, abbreviated as SS) refers to the solid material suspended in water, including inorganic and organic matter insoluble in water, as well as mud, sand, clay, microorganisms and so on. The content of suspended solids in water is one of the indicators of the degree of water pollution. Suspended matter is the main source of turbidity, color, and odor. Organic suspended matter in the water body is easy to anaerobic fermentation after deposition, deteriorating water quality. Suspended particles are very unstable and can be removed by sedimentation and filtration. They are unstable in water and vary with season and region.

Operation method

gravimetric method

Principle

The water samples were filtered through a 0.45 um filter membrane baked to constant weight, and the suspended solids were trapped on the membrane and dried at 103~105°C to obtain the content of suspended solids.

Materials and Instruments

Water Sample
Oven Analytical balance Dryer Aluminum case Filter paper Funnel Triangle bottle Glass rod Tweezers

Move

1. Put the filter membrane in an aluminum box, open the cap, dry it at 103~105°C for 0.5 h, take it out, cover the cap and cool it in a desiccator and weigh it. Repeat drying, cooling and weighing until constant weight (the difference between the two weighings is not more than 0.0002 g).
2. Measure an appropriate amount of well-mixed water samples (so that the amount of suspended matter is 5-100 mg), so that all of them pass through the filter membrane, and wash the residue with distilled water 3-5 times.
3. Remove the filter membrane carefully with tweezers, put it into the original aluminum box, bake it in the oven at 103~105℃ for 1h, take it out, cover the bottle and cool it in the desiccator and weigh it. Repeat drying, cooling and weighing until constant weight (the difference between the two weighings is not more than 0.0004 g).
4. Calculation of results
Suspended solids (mg/kg) = (A-B) × 1 000 × 1 000/V
Style:A - weight of suspended solids + filter paper + aluminum box, g ;B - weight of filter paper + aluminum box, g ;V - volume of water sample, mL .

Caveat

1. Floating or submerged inhomogeneous solids are not considered to be suspended substances and should be discarded from the collected water samples.

2. Collected water samples should be measured as soon as possible. If necessary, they should be stored in a refrigerated box at 4°C for a maximum of 7 days.

3. water samples should not be stored with any protective agent to prevent disruption of the equilibrium of distribution of substances between the solid and liquid phases.

4. Too little suspended material on the filter membrane will increase the weighing error and affect the precision of determination. Generally 5 ~ 100mg suspension as a measure of the sample volume of the use of the range.

5. When the viscosity of wastewater is high, it can be diluted with 2~4 times distilled water, shaken well, and then filtered after the precipitate drops.

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