On the afternoon of May 6, some residents in Maoming, Guangdong Province reacted to the pungent odor of tap water. Maoming Water Investment Group Co., Ltd. released a circular on its official website on July 7. At present, no other volatile and semi-volatile substances have been detected except the residual chlorine in the water of the pipeline network, and the water quality meets the national drinking water standards.
Bulletin said that the residual chlorine content in tap water was 0.5 mg/L, which was slightly higher than that in normal tap water. Therefore, it was preliminarily estimated that the odor in water was residual chlorine. The pungent odor produced by residual chlorine is different from each other in taste perception, so the expression of residual chlorine flavor is also different. In addition, the natural panic psychology of citizens has caused a heated discussion in society.
Circular pointed out that after the extraction of water samples, in addition to on-site detection of residual chlorine content in water samples, the water samples were brought back to the company for volatile and semi-volatile substance detection. At present, other volatile and semi-volatile substances have not been detected except the residual chlorine in the water of the pipeline network, and the water quality conforms to the national drinking water standard. According to the analysis of the current situation, the odor of tap water belongs to the irritating odor of free residual chlorine. The water quality is safe and secure. Please rest assured that the citizens can drink it.
The bulletin also pointed out that the main reasons for the high residual chlorine were that the third phase of Hedong Waterworks was formally connected to the grid in March this year, with a high degree of automation. At present, it is still in the trial operation stage, and the system debugging is being further improved. In the production process, the automatic chlorination control system sometimes has a slightly higher residual chlorine content than usual, and the residual chlorine in the effluent is slightly higher. The content was 0.55 mg/L. The first and second phases of the project are to control the chlorine dosage manually. The three different phases of the project are currently in the stage of debugging and integration. Sometimes the residual chlorine content in tap water will be slightly higher or lower than usual. When the content is slightly higher, the taste will be slightly thicker than usual.
Bulletin said that Maoming Water Investment Group Co., Ltd. will strengthen the third stage commissioning management of Hedong Waterworks, closely monitor the changes of residual chlorine index and make scientific commissioning to ensure the safety of tap water quality.
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