Start-up method of low-temperature groundwater biological iron and manganese removal process coupled with autotrophic denitrification

Abstract

The invention discloses a starting method of a biological iron and manganese removal technology for low-temperature underground water, with coupling autotrophic nitrogen removal, and belongs to the field of water supply purification. Firstly iron and manganese oxidizing bacteria, nitrifying bacteria and anaerobic ammonium oxidation bacteria efficient bacteria solution are inoculated into a filter chamber, underground water with manually configured iron, manganese and ammonia of 1 to 2mg / L, 3.0 to 3.2mg / L and 3.0 to 3.2mg / L respectively is fed into the filter chamber, and 100 percent backflow cycling culturing is performed at 0.5m / h rate and in a 7 to 8L / (m2*s) backwash condition. When the removal rate of manganese and ammonia nitrogen by physical absorption coupling biological oxidation is reduced to 15 to 30 percent, cycling is stopped, and underground water is fed, culturing is continued till the total iron is 0.3mg / L in 1t, manganese is 0.1mg / L in 1t and ammonia nitrogen is 0.5 mg / L in 1t in outlet water. Then the operation rate is increased to 4.0m / h, the backwashing strength is improved to 11 to 12L / ( m2*s), and finally, underground water with iron, manganese and ammonia of 8 to 13mg / L, 3.0 to 3.22mg / L and 3.0 to 3.2mg / L respectively is fed into the filter chamber to perform culturing continuously. When the removal rate of manganese and ammonia nitrogen by the filter chamber reaches 70 to 80 percent, the filter chamber is successfully started.

Description

Technical field: [0001] The invention belongs to the field of water purification. It specifically relates to the start-up method of the low-temperature groundwater biological iron and manganese removal process coupled with autotrophic denitrification. Background technique: [0002] In recent years, the raw water of groundwater plants for iron and manganese removal has been increasingly polluted by ammonia nitrogen. According to the "2015 China Environmental Status Bulletin" report, 13.4% of the centralized drinking water (groundwater) sources in cities above the prefecture level are not up to standard, and the main pollutants are iron, manganese and three nitrogen (ammonia nitrogen, nitrate nitrogen and nitrous). . Since the theoretical oxygen demand of ammonia nitrogen is 4.57 mg / L, and the oxygen demand of iron and manganese is only 0.143 mg / L and 0.29 mg / L, the high concentration of ammonia nitrogen pollutes groundwater, which leads to the traditional "water drop aerati...

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Problems solved by technology

The addition of strong chemical oxidants not only increases the cost of water treatment, cumbersome operation, but also has the possibility of secondary pollution

In addition, the traditional "chemical contact oxidation + filtration" process has a low hydraulic load and cannot meet the increasing water demand of the city

[0004] The lower the temperature, the worse the biological activity of microorganisms. At present, the actual water temperature for engineering application of biological iron, manganese and ammonia nitrogen removal technology is generally above 8°C. For the research and development of low-temperature groundwater at 5-6°C for complex pollution of iron, manganese and ammonia Engineering applications have not yet appeared

[0005] The traditional biological iron and manganese removal filter has poor ability to resist water quality changes after successful start-up. Once the filter influent water quality deteriorates or the filtration rate increases, the influent iron, manganese and ammonia nitrogen load increases, and the concentration of manganese and ammonia nitrogen in the effluent from the filter decreases. will increase, or even exceed the

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