Sewage treatment monitoring refers to the real-time detection of various water quality indicators in the sewage treatment process to understand the operating status and effect of sewage treatment. Monitoring data is an important basis for judging the effect of sewage treatment, adjusting the treatment process and operating parameters. Through monitoring, the problems in the sewage treatment process can be found in time, and corresponding measures can be taken to adjust and ensure the integrity of the sewage treatment system Run normally. Sewage treatment monitoring mainly includes pH value, suspended matter (SS), turbidity, sludge concentration, total dissolved solids (TDS) T, chemical oxygen demand (COD), biochemical oxygen demand (BOD), total organic carbon (TOC), dissolved oxygen, temperature, electrical conductivity, oil, polycyclic aromatic hydrocarbons (PAHs) ammonia nitrogen (NH3-N), total phosphorus (TP), chroma, etc.