Control method for sediment ineutrophic drainage basins

Abstract

The invention belongs to the technical field of environmental governance, in particular to a control method for sediment in eutrophic drainage basins. The control method comprises five steps as follows: modification, mixing, granulation, firing and covering, the release of pollutants from sediment in eutrophic drainage basins can be controlled, the control time is long, and effects are stable; andthe control method has better adsorption effects on the pollutants in water, and the second pollution problem caused by disturbance actions such as stormy waves, vortex, aquatic animals, anaerobic production period of the sediment and the like can be solved. The control method has the characteristics of simple operation and low cost, thereby having broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, in particular to a method for controlling sediment in eutrophic watersheds. Background technique [0002] With the rapid development of the economy, frequent migration of human activities, accelerated urbanization, and a substantial increase in sewage discharge, while the treatment of sewage is relatively lagging behind, a large amount of sewage is directly discharged into rivers and lakes, and rain and sewage are not diverted, resulting in serious siltation of rivers and lakes and pollution. As of 2016, the pollution level of groundwater in China's seven major water systems, major lakes, coastal waters and some areas has been increasing year by year, which has overwhelmed China's rivers and lakes. The self-purification ability of the river and lake water body will be affected, which will cause further deterioration of the river and lake water environment. If it cannot be treated ...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the economy, frequent migration of human activities, accelerated urbanization, and a substantial increase in sewage discharge, while the treatment of sewage is relatively lagging behind, a large amount of sewage is directly discharged into rivers and lakes, and rain and sewage are not diverted, resulting in serious siltation of rivers and lakes and pollution. As of 2016, the pollution level of groundwater in China's seven major water systems, major lakes, coastal waters and some areas has been increasing year by year, which has overwhelmed China's rivers and lakes. The self-purification ability of the river and lake water body will be affected, which will cause further deterioration of the river and lake water environment. If it cannot be treated in time, it will affect the ability of the river to discharge floods and pose a threat to the safety of citizens' lives and property; due to the pollutants contained in the sediment Most of them are highly toxic, difficult to decompose, and difficult to handle, so it is easy to cause water quality to deteriorate; and the toxic components in the sludge will be adsorbed in the bait of fish or aquatic animals or on the roots of plants, consuming dissolved oxygen in the water, Cause the death or variation of aquatic organisms, affect the aquatic system, cause a large reduction in the population of aquatic organisms, and reduce the diversity of biological populations; in addition, the silt also contains odorous gases decomposed from organic pollutants, which makes the water body smelly, especially In the dry season, residents around rivers and lakes live in an environment surrounded by foul smells. Heavy metals such as mercury, lead, and arsenic in the sludge also pose hidden dangers to human health.

[0003] In the prior art, by covering inert materials such as sand, gravel and limestone granular minerals, although the cost is low, its adsorption capacity is poor, the ability to control nitrogen and phosphorus in eutrophic watersheds is poor, and the ability to improve water bodies is relatively weak; and By cleaning the bottom mud, soil, water purification sludge, and modified materials such as modified clay minerals and zero-valent iron, although it has excellent control ability on the release of pollutants such as nitrogen, phosphorus, and organic matter in the bottom mud, but Due to its small particle size, under the disturbance of wind waves, vortex, aquatic animals and sediment anaerobic production period, it is easy to float up or cause secondary pollution with water loss, which obviously limits the application of this kind of covering material. Use; Another example is that the patent CN103951463A adopts the covering material prepared from red mud, clay, fly ash and foaming agent, which can effectively and continuously control the discharge of phosphorus and COD to the overlying water body in the eutrophic pollution lake bottom mud, and at the same time It overcomes the problem of secondary pollution caused by floating or water loss under disturbed conditions, but its adsorption capacity for nitrogen, phosphorus and heavy metal ions is not ideal, and the improvement cycle for sediment is longer and the cost is higher

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