Yichun Luming Mining Tailings Reservoir Leakage Event: Hulan River Molybdenum Concentration Achieves Standards across the Board
"The emergency disposal goal of 'Do not allow excessive sewage to enter the Songhua River' will certainly be achieved." On April 11, at the emergency disposal work site of the Luming mining tailings pond in Yichun, a member of the National Environmental Emergency Expert Group and the South China Ministry of Ecology and Environment Guo Qingwei, director of the Environmental Emergency Research Center of the Institute of Environmental Sciences, told reporters.
The monitoring data at 3 a.m. on April 11 showed that the characteristic pollutant molybdenum leaked from the tailings pond has been effectively controlled, and the molybdenum concentration of the Hulan River reached the standard across the board.
According to reports, after the emergency interception work has passed the stage of blocking, interception and pollution control peaking, it has entered the stage of cleaning and repairing since April 7, and implemented a comprehensive water quality purification and cleaning guarantee project in Lanxi to ensure that the water quality meets the standards and timely start the river channel. The clean-up of contaminated bottom mud prevents secondary pollution.
After the incident, the Ministry of Ecology and Environment quickly dispatched a working group to the scene to guide and promote emergency work. On the afternoon of April 10th, the reporter followed the working group to the Hulan River, about 1 km downstream of the site of the Hulan River Water Purification Project of Lanxi Bridge, and about 66 km from the mouth of the Hulan River into the Songhua River. The reporter noted that the river water It has been basically cleared.
"The chemicals put in the emergency disposal process will not have an impact on the water environment." Song Yonghui, leader of the National Environmental Emergency Expert Group and vice president of the Chinese Academy of Environmental Sciences, said that the tailings particles leaked this time are very fine, with a particle size of 200 mesh Above (diameter below 75 microns), suspended in water is not easy to settle. In order to remove pollutants, the experts determined to take the technical route of adding flocculants to precipitate suspended solids and molybdenum pollutants after research. The selected flocculants polyacrylamide and polyferric sulfate are all used in drinking water treatment, and will not Environmental impact.
In response to the question of whether tailings pollutants contain other harmful substances, Ma Fang, an expert from the National Environmental Emergency Expert Group and a professor from Harbin Institute of Technology, introduced to ensure foolproof water environment quality. From 3 to 5 April, the Emergency Command Department Among the areas affected by the leakage incident of Chunluming Mining Tailings, three representative sections were selected to conduct a full analysis of 109 indicators. The results show that, according to the drinking water quality standards, except for the molybdenum element that exceeded the standard, the oil and COD met the requirements at that time. Other substances were not detected or traces, and no other toxic and harmful substances were found.
Ma Fang said that molybdenum is a trace element necessary for living things. From the perspective of this emergency, a large amount of monitoring data shows that the content of molybdenum in the water after emergency treatment is less than 0.07mg / L, which meets the drinking water standard and will not affect the safety of drinking water for residents.