Synergistic biological treatment method for washing waste water and amine salt waste liquor produced by capturing CO2 in smoke of coal-fired power plant

Abstract

The invention relates to a synergistic biological treatment method for washing waste water and amine salt waste liquor produced by capturing CO2 in smoke of a coal-fired power plant. Waste amine salt in amine salt waste liquor produced by a regenerating tower in a flue gas CO2 capturing process is taken as one organic carbon source in a biological treatment process, an anaerobic and aerobic two-stage biotreatment is adopted for treating the washing waste water and the amine salt waste liquor, the washing waste water and the amine salt waste liquor are pumped into an anaerobic biological reaction column by a water pump, nitrate is converted into N2 under the action of denitrifying bacteria, sulphate is converted into S<2-> under the action of Desulfovibrio, organic carbon in organic amine salt is taken as a partial organic carbon source for sulphate reduction bacteria, and amine is converted into ammonia nitrogen. Waste water after anaerobic treatment enters an aerobic biological reaction column, nitration and denitrification of ammonia nitrogen are realized by carrying out intermittent aeration by an air pump, and finally ammonia nitrogen is released into the air in the form of N2; S<2-> generates sulphur under the action of thiobacillus thioparus, simple substance sulphur is recycled by a sulphur separator, and separated waste liquor returns to a washing tower to be recycled; and no pollution is produced in a CO2 capturing process.

Description

technical field [0001] The invention provides a coal-fired power plant flue gas CO 2 The invention discloses a co-biological treatment method for washing waste water and amine salt waste liquid produced by capturing, and belongs to the technical field of sewage treatment for environmental protection. Background technique [0002] CO control 2 The emissions are one of the important technical routes to deal with climate warming. About 40% of the world and about 50% of my country's CO 2 As for coal-fired power plants. If China needs to implement large-scale CCS in the future to achieve CO 2 Coal-fired power plants will be the focus of capture. [0003] CO in flue gas from coal-fired power plants 2 The volume percentage is low, and the chemical absorption method based on MEA is the current flue gas CO 2 Capture is the most widely used technology. Flue gas contains a certain amount of SO x and NO x , although the flue gas has been desulfurized and denitrified, the CO 2...

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Problems solved by technology

[0006] The purpose of this invention is to provide a kind of coal-fired power plant flue gas CO 2 Coordinated biological treatment of water washing wastewater and amine salt waste liquid generated by capture to solve CO in flue gas from coal-fired power plants 2 Secondary pollution problems such as washing wastewater and waste amine salts generated during the capture process, providing a convenient and low-cost biological treatment method

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