Ecological restoration technology of heavy metal pollution in lead and zinc slag field

Project background
The lake is located in the south of Zixing city of Hunan Province, located in the upper reaches of Xiangjiang. Dongjiang Lake is the second largest lakes in Hunan Province, a total capacity of 9740000000 cubic meters. East Lake has become an important strategic drinking water resources in Hunan Province, but also an important source of water in Xiangjiang.
At present, the pollution of heavy metals in the industrial, agricultural, domestic sewage and living garbage and organic pollution (BOD COD/), as well as agricultural and pesticide pollution. Lakeshore erosion and damage to the ecological environment in recent years has become more and more serious.
The mining, processing and smelting activities of the East River basin can be traced back to 100 years ago. It is estimated that the area affected by the lead zinc mine is 11 square kilometers, the existing waste of about 660000 tons, of which about 100000 tons have been cleared. The whole basin residual mining waste, such as waste rock, slag and tailings, and contaminated soil and underground mine drainage, are likely to cause serious pollution of the water environment of Dongjiang Lake. Therefore, it is urgent to find effective technology to manage and prevent these pollution sources.
2013, funded by the Chinese Ministry of science and technology, Hunan Province, the Scientific Research Institute of environmental protection led by the international cooperation project – “the East River pollution prevention and control of pollution prevention and control of key technologies and demonstration”, which is designed to prevent the pollution of heavy metals in the mine waste and contaminated soil. This report is a part of the sub project of the project – “the technology of the heavy metal pollution in the lead and zinc residue field”.
The main work of Australia
The company is invited to provide technical advice for the rehabilitation of the 2 demonstration sites, which are influenced by the mining wastes of lead and zinc mines in Hunan province. Work mainly includes:
– a review of the initial rehabilitation programme prepared by the Central Academy of sciences;
– technical exchange and the control of metal dissolution and migration in the Hunan province of eastern and Eastern regions”;
– field survey;
– propose a restoration plan, and develop an experimental work plan to determine the optimum repair plan for each site.
At present, the largest water quality risk in the demonstration site is acidic and metal containing wastewater, i.e., AMD or heavy metal pollution. This is related to the oxidation of sulfide minerals. The main source of AMD 2 site is sulfide minerals and residual slag in waste rock.
Based on the international AMD and heavy metal management of the leading practice, the company proposed 5 for the scene of the program. In addition, the report also includes an experimental program that can help to further determine the effective rehabilitation program for 2 venues.
After the mine waste remediation, it is necessary to monitor the effect of the mine, to determine whether the site is stable, sustainable and does not produce pollution, all kinds of relevant assessment criteria have been achieved, the report also put forward a specific monitoring framework.
Similar monitoring framework can be used for all the history of the East River basin or the operation of the mine as well as related to the contaminated soil. Monitoring results as a watershed model (using software modeling, such as Source) can be:
Assist sales to quantify all into the East lakes pollution (mining, agriculture, life, pesticides etc.);
According to an East lakes pollution contribution, prioritize the types and sources of pollution, easy to manage;
The relative benefits of different sales management strategies in the Dongjiang Lake Basin of various types of pollution and assessment of the source.