In fact, water quality testing should be prioritized across various industries, and the nitrogen fertilizer plant discussed herein is merely one representative case. First, it is necessary to clarify the function of a nitrogen fertilizer plant: such facilities primarily employ chemical methods to fix atmospheric nitrogen for the production of nitrogen-containing chemical fertilizers. Water is an indispensable resource in the production process, inevitably leading to wastewater generation and subsequent water pollution issues.

To prevent water pollution, proper wastewater management is essential—including rational utilization and appropriate treatment of wastewater. Concurrently, water quality testing equipment must be used to analyze various indicators in wastewater; discharge is only permitted when all indicators meet the specified standards. This necessitates the establishment of wastewater discharge monitoring points in nitrogen fertilizer plants. Similar to most engineering practices, monitoring points are typically installed at the total wastewater discharge outlet and rainwater discharge outlet, where corresponding water quality testing equipment is deployed for real-time monitoring of key indicators. The specific parameters to be tested are as follows:

1.For the total wastewater discharge outlet, the core monitoring parameters include:COD (Chemical Oxygen Demand), ammonia nitrogen, total nitrogen, cyanide, volatile phenol, pH value, and petroleum hydrocarbons.

2.For the rainwater discharge outlet, the primary parameters to be tested are:COD (Chemical Oxygen Demand), ammonia nitrogen, suspended solids, and pH value.