Measurement of COD in high-chloride wastewater
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What methods are commonly used to measure COD in high-chloride wastewater? The chloride content is 16,000; it seems that the results obtained using the potassium dichromate oxidation method are unstable and exhibit large variations. Do anyone have any good methods or suggestions for measuring COD in wastewater with high chloride contents?
The chloride content in this sample has far exceeded the range specified by national standards for the COD measurement using the chromium method; furthermore, the manganese method may also be subject to certain limitations. It is recommended to use the TOC method to detect organic pollution, and to use TOC as an indicator of the degree of pollution. Water with 16g/L of chloride ions – the salt concentration is already very high.
Yeah, it seems that the measurement results have a significant impact these days. It’s okay for our own company, but the local environmental protection authorities still check this parameter