Wastewater sources in water treatment plants are multifaceted, encompassing industrial wastewater, urban sewage, domestic sewage, and other contaminated water bodies. All such wastewater must undergo treatment at water treatment plants and can only be discharged upon meeting the required standards for all parameters. How, then, can effective wastewater monitoring be implemented in water treatment plants? A critical prerequisite is to first understand the pollutants associated with each source. Below is an explanation of the Online Water Quality Monitoring indicators for urban sewage and industrial wastewater.
Monitoring Indicators for Urban and Domestic Sewage Treatment
For wastewater containing toxic and hazardous pollutants, monitoring indicators can be categorized based on the following monitoring points:
1.Total Wastewater Discharge Outlet: Key indicators include ammonia nitrogen, total phosphorus, total nitrogen, chemical oxygen demand (COD), water temperature, heavy metals (total lead, total arsenic, hexavalent chromium, total mercury, total cadmium, etc.), total coliforms, chroma, animal and vegetable oils, petroleum hydrocarbons, anionic surfactants, and other pollutants.
2.Stormwater Discharge Outlet: Primary pollutants to be monitored include ammonia nitrogen, suspended solids (SS), pH, and COD.
Monitoring Indicators for Industrial Wastewater Treatment Plants
It is important to note that when monitoring wastewater from mixed industrial sectors, the selection of indicators is determined by the pollutants regulated under the discharge permit system. The main monitoring points align with those mentioned above, and the specific indicators are as follows:
1.Total Industrial Wastewater Discharge Outlet: Indicators include heavy metals (total chromium, total mercury, total arsenic, total cadmium, etc.), total phosphorus, COD, total nitrogen, ammonia nitrogen, flow rate, pH, water temperature, and other pollutants.
2.Stormwater Discharge Outlet for Industrial Areas: Key indicators include suspended solids, ammonia nitrogen, COD, and pH.
Regarding the selection of Water Quality Analyzers for these indicators: each parameter requires targeted detection, as different parameters necessitate distinct instruments. In essence, single-parameter analyzers are employed for the monitoring process.
