Guangxi Hechi, which had suffered serious heavy metal pollution, managed to establish a complete soil remediation industrial chain through the implementation of a system of accountability so that once-irrigated cultivated land was abandoned, One of the pilot areas for comprehensive prevention and control of soil pollution, exploration of the treatment of heavy metal pollution has been in progress.
It is the grass long warbler fly season, into Hechi, Heibei City, Guangxi Maonan Autonomous County Daan Township, into a piece of mulberry green.
"Our farmland is finally able to re-grow crops. In recent years, the situation is getting better. Last year, two mu of mulberry harvest in our house earned more than 10,000 yuan." Qin Haifang, deputy director of Da'an Community Village Committee, said: "It is hard to imagine that this Cropland suffered heavy metal pollution. "
Phytoremediation technology-led construction of a complete soil repair industry chain
This reporter has learned that in June 2001, Huanjiang County was hit by torrential rains. The tailings ponds of three mineral processing enterprises in the upper reaches of the Huanhuan River were washed away by floods. The tailings sand deposited by 30 mineral processing enterprises flooded the coastal farmland with flooding. "After the pollution, some fields harden soil, bare one, not grass." Da'an Township Da'an community villagers Lu not say.
The soil pollution has aroused the concern of the Ministry of Science and Technology, the Chinese Academy of Sciences and the National Natural Science Foundation of China and other departments. In 2005, it supported the research and development of the Environmental Rehabilitation Center of the Institute of Geographic Resources, Chinese Academy of Sciences and the application of restoration technologies such as inter-plantation of hyperaccumulators and economic plants. "Taking centipede grass as an example, stems and leaves can enrich a large amount of arsenic, and contaminated soil around the Huanjiang River can enrich and remove heavy metals by these plants," said Lin Xiaolong, an engineer in charge of the project under the Chinese Academy of Sciences.
By 2010, Huanjiang County will receive special fund support from the central government to start the project of soil heavy metal pollution control in the Da Huan River Basin. Huang Rongbiao county party secretary introduced, "This soil restoration project, built a complete industrial chain of soil remediation, to explore the phytoremediation-led," local government-led, scientific research unit technical support, farmers take the initiative to participate in the soil remediation project mode."
Peasants are the real agents of restoration. Responsible management of farmland, the government free of charge to provide technology, repair agents and seedlings, farmers contract their own crops, income to farmers. "The government distributes centipede grass seedlings, southeast Sedum seedlings and mulberry seedlings free of charge. The farmers seed the seedlings together and sprinkle the restoratives as required to improve the effect a year better than a year." Qin Haifang said.
In 2015, the treatment project passed the inspection and acceptance successfully, totally repairing 1280 mu of heavy metal contaminated farmland. The output of agricultural products in the control area reached above 90% of the normal output level in the region, and the content rate of heavy metals in agricultural products exceeded 95%. According to the 20-year and 50-year long-term agricultural yields, these farmlands can generate an economic income of 156 million yuan and 390 million yuan.
Strict control of emissions-related businesses, the preparation of basic farmland soil environmental quality monitoring report
Hechi's heavy metal pollution control did not stop. Under the impetus of the environment, we should take tough measures such as shutting down and rectification of heavy-duty enterprises that have potential environmental safety hazards and speed up technological upgrading and relocation of enterprises into the park to improve the water quality of the main rivers in the city.
Nandan County Diao Jiang's governance is a microcosm. Diaojiang a total length of 219.6 kilometers, is the river of life of people along the coast. However, before 2010, there were 72 heavy metal smelting enterprises in Nandan section of Diaojiang River, with backward production technology and direct discharge of wastewater into Diao River. Slag was piled in the open air and heavy metal pollution was serious. "There was a steady stream of smoke that day, dirty water straight irrigation." Wu Diandong grew up in Diao Jiang said.
In order to control Diaojiang, a new water treatment system is built in the area. The mine-related enterprises use the system to purify downhole drainage, mineral processing wastewater and domestic water for the recycling of mineral processing water. Luo Xianwei, deputy general manager of Guangxi Huaxi Group Co., Ltd., introduced that "the company handles 12,000 cubic meters of sewage treatment plant project on a daily basis and the treated water quality meets the three types of water discharge standards on the surface."
At present, Hechi Municipality has conducted a survey on the soil environmental conditions of basic farmland in three key national heavy metal pollution prevention and control areas in Huanjiang, Nandan and Jinchengjiang districts, and completed the monitoring report on the soil environmental quality of basic farmland in key districts and counties in Hechi City. At the same time, it also conducts soil environmental quality monitoring on centralized drinking water source areas and major vegetable planting bases.
The face of the river slowly become clear, Wu Wenlong took a photo sent to WeChat, "a lot of small partners go out to see can not believe it, here actually become so beautiful, so clean."
Guangxi uses big data to promote detailed investigation of soil pollution (link)
Nanning, April 9 (Reporter Pang Geping) The reporter learned from the Guangxi Zhuang Autonomous Region Department of Finance and other departments that Guangxi is using a big data model to promote detailed land pollution investigations and help promote ecological management of the land. The current funds in place has reached 180 million yuan, will be used for detailed investigation of soil contamination related systems and standards development, detailed investigation of soil pollution information construction.
According to Li Kailin, director of the Institute of Finance and Science of Guangxi Finance Department, Guangxi is making full use of the multi-sector resources such as the Environmental Protection, Geology and Mineral Resources and Geo-information Surveying and Mapping Bureau through big data mode to realize the establishment and sharing of multi-sectoral resources and the dynamic updating of the soil environment database Management and utilization system to promote soil risk control, promote soil pollution control, and gradually improve soil environmental governance.
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