## Project Background
The sewage pretreatment station serving the electroplating industrial park has a daily treatment capacity of 1,500 tons. The influent water contains heavy metals such as cyanide, chromium, and nickel, and the pretreatment process generates H2S, HCN, and Cl2. The current monitoring equipment only covers some points and has a slow response time.
## Implementation Plan
Deploy 22 sets of fixed detectors for four types of gases (H2S/HCN/Cl2/CO), with a focus on the regulating pool, acid-base neutralization pool, and sludge dewatering room. Each operator is equipped with a four-in-one portable device with a whistle.
– Lower range limit of 0.5 ppm for HCN detection
– Alarm classification: Level 1 on-site audible and visual alarm, Level 2 control room broadcast, Level 3 park-wide WeChat alert
– Directly linked with emergency forced exhaust fan
## Implementation Effect
In the eight months since its launch, there has been zero occurrence of frontline operational accidents; it has been awarded the title of “Management Benchmark” in special inspections conducted by third-party environmental protection organizations, and has been used as a training model for new enterprises in the park.
