Standard Methods; 2540 A, 2540 F
Scope and Application
The settleable solids test is the measurement of the volume of solids in one liter of sample that will settle to the bottom of an Imhoff cone during a specific time period. The test indicates the volume of solids removed by settling in sedimentation tanks, clarifiers or ponds. The settleable solids test indicates whether the primary and secondary processes are functioning properly.
No reagents are needed for the settleable solids test.
Storage / Preservation
Samples may be stored in a plastic or glass container and kept for 7 days at 4° C. See sample storage and preservation table.
Raw Data Sheet Format
The following must be recorded on the data sheet:
Quality Control Requirements
The procedure for this test is very simple and does not lend itself to quality control requirements in the classical sense. The most important aspect is to ensure that the time requirements are closely followed. This is to standardize testing that will simulate the theoretical operation of the clarifier or settling basin.
Note: Do not include any floating solids or any voids in the settled solids as settleable matter.
No calculations are necessary to determine the settleable solids. The data obtained after the one hour test is the result. Any calculations done with this result will be used to calculate efficiencies or determine whether the equipment is operating properly.
Settleable Solids Analysis; the Tips for Techs version