Core Viewpoint - The incident involving the discharge of foam into the Bai Zhi Drain River was caused by improper storage of raw materials by a detergent manufacturing company, leading to an environmental investigation and cleanup efforts by local authorities [1] Group 1: Incident Details - On August 9, a significant amount of foam was discovered in the Bai Zhi Drain River, prompting immediate action from the ecological environment department and local authorities [1] - The foam was found to contain anionic surfactants, a key indicator of detergent products, exceeding the standard by 0.38 times [1] - The source of the foam was traced back to a detergent production company's raw materials, which were improperly stored and subsequently entered the river [1] Group 2: Response and Monitoring - The local authorities conducted a cleanup operation that successfully removed all foam from the river by the early hours of August 10 [1] - Following the incident, the ecological environment department intensified water quality monitoring at 10 points along the Bai Zhi Drain and downstream sections, confirming that anionic surfactant levels were within acceptable limits [1] - Monitoring results indicated that the downstream water quality of the Hun River was unaffected, with no detection of anionic surfactants [1]

Group 1 - The ecological environment department of Shenyang City reported a significant foam presence in the Bai Zhi Drainage River, with anionic surfactants exceeding the standard by 0.38 times [1][4] - The foam was traced back to a washing product manufacturing company, where improperly stored raw materials for hand sanitizer entered the river, causing the foam formation [4] - Following the incident, the ecological environment department conducted extensive water quality monitoring, confirming that downstream water quality remained unaffected, with no detection of anionic surfactants [4]