Frontline Style | Guizhou Daily: The "Gatekeeper" of Urban Water Environment Safety: Li Yan, a water quality inspector born in the 1990s ​

“Have you collected all the sampling bottles and cards? We are about to depart! "On the morning of March 10th at 8:30, Li Yan and her colleagues, who had changed into their uniforms, prepared to depart for the recycling plant to carry out sampling operations.

Li Yan, born in the 1990s, is the supervisor of the laboratory station in the Nanming area of the Guizhou business region of China Water Environment Group. This laboratory station is one of the nine laboratory stations of the Guizhou Business District Laboratory Analysis Center, mainly responsible for 365 day water quality testing of the effluent and influent of five recycled water plants in Guiyang, including Qingshan, Taici, Guigang, Guimian, and Hebin. Its services cover nearly 800000 people in the central urban area of Guiyang.

Water quality inspectors like Li Yan are important "gatekeepers" in the water environment monitoring work in the central urban area of Guiyang.

Li Yan (first from the right) and colleagues took samples on site.

Thousands of sampling tasks have allowed Li Yan to navigate through an underground maze like underground reclaimed water plant, which she is already familiar with.

We need to complete the sampling of 5 recycled water plants within 2 hours in the morning every day, and then enter the sampling, pretreatment and other processes. The operation must be proficient and standardized. "Entering from the entrance of the factory, Li Yan and her colleagues walked through the winding underground walkway, taking light and agile steps. After a few minutes, they arrived at the water plant inlet. Li Yan bent down, opened the well, and used a water dispenser to quickly complete the series of operations of water intake and bottling.

Li Yan is concentrating on testing water quality in the laboratory.

A pair of black framed glasses and a pair of smiling eyes make Li Yan look very friendly. Li Jie, can you check if the labels here are filled in correctly? "In the laboratory station, colleagues prefer to call her" Li Jie "instead of" supervisor ".

Sampling is divided into inlet sampling and outlet sampling. After sampling is completed, it is required to return to the testing room in a timely manner for sampling, pretreatment, sub item testing and other processes.

We need to complete the collection and reporting of testing data before 5 pm every day. The results of the daily testing have important reference significance for water quality monitoring and production process adjustment in the water plant, "said Li Yan. Currently, the Nanming Laboratory Station can meet the COD BOD5、NH3-N、TP、TN、PH、SS、MLSS、MLVSS、 Detection of chromaticity, fecal coliform count, nitrate nitrogen, nitrite nitrogen, etc.

Water quality testing needs to be conducted continuously for 365 days, repeating the same work every day. Despite the seemingly dull and tedious laboratory work, Li Yan never tires of it.

Through precise detection of each data item, the efficiency of each production process in the reclaimed water plant can be accurately reflected.

According to changes in data, water plants can make timely adjustments to their processes to improve sewage treatment efficiency, "said Li Yan.

Water quality testing work is related to water ecological safety and cannot tolerate any carelessness. Li Yan said, "Water quality inspectors require rigor and meticulousness. I can protect the good water ecological safety of our city, which is the greatest satisfaction brought by this job

Li Yan and colleagues tested water samples from a reclaimed water plant

Li Yan took samples at the outlet of the reclaimed water plant

Last September, due to the impact of epidemic prevention and control measures in Guiyang City, Li Yan and her colleagues stayed at the laboratory station for a month, stayed on the front line of their posts, and made every effort to ensure the stability of water quality monitoring data for Nanming River and surrounding rivers and lakes in Guiyang City.

The operation of the reclaimed water plant is inevitably subject to unexpected situations. In the middle of the night last November, Li Yan received a sudden call from Taici Reclaimed Water Plant. Due to insufficient total nitrogen standard solution detection reagent content in the plant's online detection equipment, the equipment triggered an alarm.

Li Yan took samples

Due to the inability of third-party maintenance company staff to arrive in a timely manner, Li Yan, who is proficient in the production of testing reagents, took the initiative to undertake this "emergency" task. She set off from home and rode her electric bike for half an hour to arrive at the scene, guiding the workers of the recycling water plant to prepare medication and complete the production of 500 milliliters of testing reagents. Quickly, 10 minutes later, the online equipment of the water plant automatically sampled and detected, and returned to normal, avoiding an accident of abnormal data upload.

Li Yan believes that the laboratory work at the testing station is very ordinary, but a lack of passion and dedication is not enough. Only when everyone collects every sample with care, carefully tests every data, and issues every report seriously, can we truly control water safety and maintain a good water environment in the city.