Method for determining COD of high-concentration suspended substance wastewater

Abstract

The application discloses a method for determining COD of high-concentration suspended matter wastewater, comprising the following steps: obtaining a high-concentration suspended matter water sample, stirring the water sample uniformly and forming solid matters; weighing a solid matter sample with a preset mass, converting the solid matter sample into a liquid state, and then determining the COD value of the sample; calculating the dilution multiple of the raw water sample, and calculating the COD value of the raw water sample according to the COD value and the dilution multiple of the sample. The method for determining the COD of the high-concentration suspended matter wastewater can ensure that the suspended matter and the sewage can be diluted at the same proportion without difference, has high uniformity, avoids the blockage problem of a small-volume pipette when a small amount of water sample is sucked and diluted, and avoids the non-uniformity when a small amount of raw water is taken, so that the problem that the suspended matter cannot be uniformly taken out due to secondary precipitation in the dilution process does not occur, and the COD value of high-concentration large-amount suspended matter wastewater can be determined.

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