In 2024, Proya Huzhou Factory initiated a "Zero Direct Discharge of Rainwater" renovation project. By establishing a smart rainwater collection and treatment system, the factory installed smart valve systems at rainwater discharge outlets to monitor key indicators such as pH (6-9), conductivity (<1000 μS / cm), and ORP. The system automatically assesses whether the water quality meets standards, thereby precisely controlling the opening and closing of the valves. Currently, all three parameters at the factory comply with the required standards.

The factory installed additional equipment, including lift pumps, level gauges, and flow meters, in the initial rainwater collection pool. The level gauges provide real-time feedback on the water level in the pool, enabling employees to monitor the situation promptly. Subsequently, the initial rainwater is reused for irrigation and greening through the lift pumps. Additionally, the flow meters are equipped with data upload functionality, allowing for accurate recording of the usage of initial rainwater.
The factory also established an emergency response pool, which must remain empty under normal conditions to ensure maximum storage capacity for accident waste

water in the event of an incident. To monitor the water level in the emergency pool in real time, the factory installed level gauges and equipped the pool with lift pumps. This could ensure that, in the event of an accident, wastewater from the emergency pool can be promptly transferred to the factory's wastewater treatment station for processing and discharged only after meeting the standards. These measures can effectively prevent environmental pollution caused by accident wastewater.