Ningbo Huizhong Automotive Axle Manufacturing Co., Ltd

Ningbo Huizhong Automotive Axle Manufacturing Co., Ltd. generates wastewater during its production processes. This wastewater may contain various pollutants, such as total chromium, total nickel, Chemical Oxygen Demand (COD), Suspended Solids (SS), total phosphorus, ammonia nitrogen (NH₃-N), phosphate, pH value, and petroleum oils. To ensure that the wastewater meets national and local environmental standards before discharge, the company needs to conduct water quality monitoring.

Water Quality Monitoring Items and Applicable Standards
Wastewater pollutants:
Major types of pollutants include: total chromium, total nickel, Chemical Oxygen Demand (COD), five-day Biochemical Oxygen Demand (BOD₅), Suspended Solids (SS), total phosphorus (as P), ammonia nitrogen (NH₃-N), phosphate, anionic surfactants, pH value, and petroleum oils.

Discharge standards:
Integrated Wastewater Discharge Standard (GB8978-1996), and Indirect Discharge Limits of Nitrogen and Phosphorus Pollutants for Industrial Wastewater (DB 33/887—2013).

Monitoring Measures
The company typically takes the following measures to ensure its discharges comply with the above standards:

Regular monitoring: Collect and analyze water samples at the discharge outlet at specified time intervals.

Online monitoring equipment: Install an online monitoring system to track major pollutant indicators in real time.