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Iron cycle drive based device and method for ammonia nitrogen anaerobic in-situ treatment

A technology of in-situ treatment and iron recycling, which can be used in anaerobic digestion treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., and can solve problems such as inadvisability

Inactive Publication Date: 2019-04-19
DALIAN UNIV OF TECH
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Problems solved by technology

This means that only by continuously adding Fe(Ⅲ) can the continuity of Feammox and denitrification be guaranteed, but it is not advisable in reality

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  • Iron cycle drive based device and method for ammonia nitrogen anaerobic in-situ treatment

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Embodiment Construction

[0018] The principle of the invention is based on the principle of NDFO coupling Feammox, adding nitrate to Feammox system regularly, and using nitrate as the final electron acceptor of anaerobic ammonia oxidation to remove high-concentration ammonia nitrogen.

[0019] The experimental device used in the present invention is as follows figure 1 Shown: There is a sample injection cell 1 with a stirrer i-2 fixed above. One end of the pipeline i-6 equipped with the valve i-3 and the peristaltic pump 5 is connected to the lower side of the sampling tank 1 and the other end is connected to the feed port 7 above the fermentor 8 . The upper cover of the fermentation tank 8 is provided with an air outlet pipe 11 upward and a stirrer ii-9 is fixed downward. An aeration device 10 is fixed to the bottom of the fermentation tank 8 . The lower side of the fermentation tank 8 is provided with a sludge discharge valve 16 and the middle and lower side is provided with a drain valve 12 . Th...

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Abstract

The invention provides an iron cycle drive based device and method for an ammonia nitrogen anaerobic in-situ treatment. The method is characterized in that nitrate is added into an iron containing Feammox system to trigger nitrate dependent ferric oxidation (NDFO), and the generated Fe(III) participates in Feammox to remove nitrogen. The method comprises following steps: step one, mixing seed sludge containing Feammox microbes with a nutrient solution to obtain a sludge-water mixture; step two, adding the sludge-water mixture into an anaerobic reactor, exposing the mixture to nitrogen gas (N2)until the DO (dissolved oxygen) of the sludge-water mixture reaches 0.02 mg / L or less, after five days, discharging the supernate, adding new equivalent nutrient solution, and performing the cycle for 5 to 7 times; and step three, adding nitrogen containing wastewater or a mixture of nitrogen containing solids and water, exposing the mixture to nitrogen gas (N2) until the DO (dissolved oxygen) ofthe sludge-water mixture reaches 0.02 mg / L or less, periodically adding a nitrate solution, starting stirring, wherein the operation temperature of the reactor is 25 to 35 DEG C, and the pH is controlled in a range of 5.0 to 6.0, and running the system for 90 to 100 days.

Description

technical field [0001] The invention belongs to the field of denitrification of waste water / solid waste. technical background [0002] There will be a large amount of ammonia nitrogen wastewater discharged in life and industry. The traditional denitrification method is nitrification-denitrification, that is, ammonia nitrogen is oxidized to NO by aeration first. x - (mostly NO 3 - ), NO x - After anaerobic denitrification to generate N 2 . However, nitrification-denitrification requires alternating aerobic and anaerobic processes, and consumes a lot of energy. It is only suitable for low-to-medium concentration nitrogen-containing wastewater, and cannot treat low C / N wastewater. Anaerobic ammonium oxidation (anammox) can treat high-concentration ammonia-nitrogen wastewater (NH 4 + +NO 2 - →N 2 +2H 2 O), but anammox also has some problems, such as the long generation cycle of anammox bacteria (≈11 days), sensitive to environmental factors, such as pH, salinity and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/28C02F2101/16
Inventor 张耀斌杨亚飞
Owner DALIAN UNIV OF TECH
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