Rare earth mine tail water surface source pollution efficient percolation treatment system and process

Abstract

The invention discloses a rare earth mine tail water surface source pollution efficient percolation treatment system and process, and aims to solve the problem that an existing nitrification and denitrification treatment process has higher requirements on operating temperature, carbon source demand, oxygen supply and the like, and greatly restricts the treatment of rare earth tail water. The system comprises a drainage basin regulation and storage unit, a pretreatment unit, a percolation biochemical treatment unit, a reflux unit and an auxiliary unit, According to the process, when the environment is in a normal water season, in a rich water period and in a dry water and low temperature period, the operation modes are respectively processed according to conditions. According to the systemand the process thereof, through perfect unit design, the stable operation of the surface source polluted rare earth mine tail water treatment system and process can be ensured under various conditions, particularly, the stable operation of nitrification and denitrification infiltration tanks in a core infiltration biochemical treatment unit of the system is ensured, and the maintenance labor intensity is further reduced.

Description

technical field [0001] The invention relates to the technical field of low-carbon source, high-ammonia-nitrogen, and high-total-nitrogen sewage treatment, in particular to a high-efficiency percolation treatment system for non-point source pollution in tail water of rare earth mines and a process thereof. Background technique [0002] Rare earth resources are one of the important mineral resources in China. China is very rich in rare earth resources, and its industrial reserves rank first in the world. In addition to Baiyun Obo Rare Earth Paragenetic Mine in Inner Mongolia Autonomous Region and Gannan Ion Adsorption Mine, there are also monazite, xenotime, brown yttrium niobium ore, bastnasite and lanthanum ore in Guangdong, Guangxi, Jiangxi, Shandong, Hunan, Taiwan and other provinces and regions. Wait. [0003] Rare earth metals have extremely important uses and are an important part of contemporary high-tech new materials. A series of compound semiconductors, electro-op...

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Problems solved by technology

[0007] 2. The organic content is small, the COD concentration range is mainly between 10-20mg / L, and the BOD 5 The concentration range is mainly 3-8mg / L, basically no biodegradability, and lacks the nutrient phosphorus required for biochemistry;

[0008] 3. The amount of water is large, and it is affected by seasonal climate fluctuations, mainly affected by rainfall. Generally, spring and summer have more rainfall and more water, while autumn and winter have less rainfall and less water;

[0009] 4. The water quality fluctuates greatly, and the concentration of pollutants in the wet season and the dry season is 1-3 times different;

[0010] 5. Due to the damage of surface vegetation in the mining area, the sediment content in the rare earth tail water is large during heavy rainfall;

[0011] 6. The water temperature of rare earth tail water is greatly affected by the season. The water temperature is as low as 8-10°C in winter and 24-28°C in summer.

[0013] Nitrification is the conversion of ammonia nitrogen into nitrate nitrogen by nitrifying bacteria. The main biochemical reaction conditions are water temperature, dissolved oxygen and alkalinity; denitrification is the conversion of nitrate nitrogen into nitrogen by denitrifying bacteria. The main biochemical reaction conditions are water temperature and carbon Generally speaking, in the process of nitrification and denitrification, there are high requirements on operating temperature, carbon source demand and oxygen supply, which also greatly limit the large-scale impact of nitrification and denitrification on rare earth tail water treatment. area use

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