Anti-interference detection pretreatment and COD detection kit for chemical wastewater

Abstract

The invention relates to an anti-interference detection pretreatment method for a centralized sewage treatment plant in a chemical area and preparation and detection methods of a COD detection kit. The invention provides a pretreatment method for degrading wastewater to COD of less than or equal to 1000mg / L through a low-temperature condensation device in a laboratory and removing interference ofheavy metals and the like; and preparation and a method of the detection kit for determining COD content at the wavelength of 620nm by using Hash DR6000 are adopted. The COD detection kit comprises aCOD detection reagent and a digestion colorimetric tube. The COD detection reagent comprises a chromium reagent and a silver reagent, and the chromium reagent is prepared from, in part by weight, 1-10parts of potassium dichromate, 5-30 parts of concentrated sulfuric acid, 1-10 parts of mercury sulfate and 50-90 parts of distilled water; and the silver reagent is prepared from, in part by weight,30-70 parts of silver sulfate and 30-70 parts of concentrated sulfuric acid. According to the detection method, the detection precision of the COD content of the chemical wastewater is improved, and more accurate reference is provided for subsequent environment-friendly treatment. The detection kit can be automatically configured, so that the detection cost is greatly reduced, and the operation iseasy.

Description

technical field [0001] The invention relates to the field of environmental protection treatment of industrial wastewater, in particular to the preparation and method of a chemical wastewater anti-interference detection pretreatment and a COD detection kit. Background technique [0002] The COD of wastewater discharged into the centralized wastewater treatment plant in the chemical industry often exceeds the set value of 1000mg / L, and the composition is complex, especially heavy metals, which often interfere with the results of daily detection of various indicators. Different anti-interference pretreatments need to be implemented for different wastewater . This method is aimed at the heavy metal-containing wastewater of the centralized sewage treatment plant in the chemical industry area. The on-site low-temperature condensation device is simulated in the laboratory, and the COD of the drainage is concentrated to 1000 mg / L or below, and the pH is 6-9 to meet the water inlet r...

AI Technical Summary

Problems solved by technology

At the same time, when wastewater treatment plants use Hach DR6000 to detect COD and other contents in wastewater, there is a phenomenon of long procurement time and high cost of imported detection reagents.

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