By the China Soil Environmental Rehabilitation Industry Technology Innovation Strategic Alliance (UNITA), Light Industry Environmental Protection Institute and Henan Province Law Society Environmental Resources Law Research Association jointly sponsored the "2016 national farmland heavy metal pollution prevention and control technology exchange and farmland restoration pilot project inspection activities A few days ago held in Jiyuan City, Henan Province.
Hou Hong, a professor of soil science from the Chinese Academy of Environmental Sciences, introduced the long-term national research on the influencing factors of the whole process of control, protection and treatment at the source and from the aspects of social welfare, ecological and environmental benefits, and economic benefits. The index system and evaluation method for assessing the effectiveness of environmental comprehensive management are the main ways to support the sustainable use of cultivated land in our country.
Wang Qun, president of Henan Legal Research Institute of Capital Law, introduced soil pollution prevention and control work in Henan Province has started and gradually started, local soil environmental protection legislation research has been fully carried out.
Lu Yifu, director of Institute of Environmental Science and Technology of Jiyuan City, introduced specific measures for preventing and controlling soil pollution in Jiyuan City. First, we eliminated the outdated production capacity and eliminated 74 heavy metal-related enterprises. The total number of heavy metal-related enterprises decreased from 80 to 6 Home, and optimize the layout. The second is to transform and enhance the process, all using the world's leading level of oxygen-rich bottom blowing pool smelting one-step lead smelting process, continuous mandatory audit of cleaner production, lead and sulfur recovery rate increased, reducing the pollution load. Third, strict control of the scale of development, through planning EIA, strict and tight constraints related to the scale of enterprise development, "second five" during the lead production capacity did not increase 1 ton. Fourth, we will step up environmental inspection efforts and conduct strict inspections on the operation of environmental protection facilities, material storage and solid waste disposal, and unorganized discharge so as to achieve on-line monitoring of heavy metal pollution sources and wastewater emissions.
In the comprehensive prevention and control of soil pollution, Jiyuan City has all transferred the 6,900 mu of land within 1 km of the atmospheric environmental protection distance of 3 lead smelting key enterprises such as Yuguang Gold and Lead, and leased and constructed shelter belts by enterprises. The sensitive villages around the crude lead smelting enterprises are relocated as a whole to the urban area or the township and carry out pilot projects on soil pollution remediation so as to solve the problems left over by history and promote the exploration of large areas.
During the meeting, the participants also visited the site visited Jitian Town, Jiyuan City, Tong Shi Shi North Village lightly contaminated farmland test area.
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Take measures to simultaneously repair contaminated farmland
Reporters visited the Jiyuan City, Kejing Town, Tong Village, North slightly polluted farmland pilot area. The project received special funds to support the project in 2014, with a total investment of 32 million yuan, of which 19.66 million yuan of state funds. The project implementation period of 5 years, the scale of 500 acres of contaminated farmland, including a small test and expand two stages.
According to experts, this piece of soil repair technology is divided into three tenders.
A tenders using plant extraction repair technology is planted in the contaminated soil of cadmium, arsenic, lead hyperaccumulated plants, through the extraction of plants, so that the soil of heavy metals migrate to plant stems and leaves part, and then by mowing plants The aboveground parts are then incinerated and reduced to safe disposal. The tenders by the Geographical Institute of Chinese Academy of Sciences and other three units to share the pilot. At present, various pilots have planted various types and varieties of super-rich crops, such as some southern plants centipede grass, southeast Sedum, with Mine Sedum, Solanum nigrum, etc., there are some local plants such as Bidensgrass, Castor Wait.
In the second stage, stabilization technology was used to fix the heavy metals in soils by adding stabilizers and chemical processes such as adsorption, precipitation and complexation with heavy metals in soil to reduce the effective contents of heavy metals such as cadmium, lead and arsenic in the soil, reduce the amount of crops absorbed, Ensure crop quality and safety.
Three sections of the use of ectopic stabilization and repair and other technologies, from Henan Jingu and Shanghai Kang constant share of two pilot units, Henan Jingu using superparamagnetic separation and recovery technology, with super-paramagnetic functional groups first adsorbed in the soil Heavy metals, and then through the magnetic facilities to make the superparamagnetic material adsorbed heavy metals separated from the soil, and then the desorption process so that the separation of superparamagnetic materials and heavy metals, superparamagnetic material regeneration and reuse.
It is understood that Kang Heng companies using ectopic stabilization, the soil will need to be repaired together to join the soil remediation integration equipment, equipment, efficient crushing and mixing cloth function, so that full contact with the soil and pharmaceutical reactions to achieve better stability The effect of soil after treatment backfill.
Ultimately, various methods were validated by planting crops, with heavy metal content in grains meeting the requirements of the Food Sanitation Standard and the "Limit of Contaminants in Food" and the crop yield was not reduced. At the same time, carry out economic appraisal, submit application guidelines and promotion suggestions on restoration technologies, and propose measures to prevent environmental risks in the repair process.
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