We all know that pure water, after being used, will change its original physical and chemical properties and turn into wastewater containing various impurities. What is chemical wastewater? Is there an index called “TOC” for detecting chemical wastewater? In this chapter, the editor will explore the detection of TOC in chemical wastewater together with everyone.

Chemical wastewater is diverse. It actually refers to various types of wastewater discharged during chemical production, such as process wastewater, waste gas washing water, cooling water, equipment and site flushing water, etc. Most of them are toxic and not easy to purify. They have a certain cumulative effect in the bodies of organisms and have a significant oxygen-consuming property in water, which makes it very easy for the water quality to deteriorate. If any of the above wastewater is discharged directly without treatment, it will cause water pollution, thereby affecting the ecological environment, product production and human health.

So, why is TOC in chemical wastewater detected? TOC is a non-specific detection method. Any substance that can be oxidized to form carbon dioxide can be tested. It is generally used to detect the composition of organic matter. If it is inorganic waste, detecting TOC is of no use. Therefore, if there are inorganic substances in wastewater, it cannot be detected. As for chemical wastewater, it also depends on the specific water quality conditions to see if it is suitable for detecting TOC.

There are various methods for TOC detection. The TOC-8000 – TOC online analyzer produced by Hangzhou Modi uses the non-dispersive infrared (NDIR) colorimetric method to detect the TOC content in water in real time.