Device and method for alkaline sludge fermentation to enhance autotrophic denitrification of nitrate wastewater and simultaneous phosphorus recovery

Abstract

The invention discloses a device and method for alkaline sludge fermentation to strengthen nitrate wastewater autotrophic denitrification and simultaneous phosphorus recovery. The device includes alkaline sludge fermentation coupling short-range denitrification reactor and autotrophic denitrification simultaneous phosphorus recovery reaction device. Alkaline conditions accelerate the hydrolysis of excess sludge to produce acid, produce small molecular organic carbon sources, and release a large amount of ammonia nitrogen and phosphorus; higher pH conditions and fermentation environments promote denitrifying bacteria to use short-chain fatty acids to reduce nitrate to nitrite, It and part of the ammonia nitrogen produced by fermentation are removed under the action of anammox bacteria, and the remaining ammonia nitrogen and phosphorus released by fermentation are separated and recovered in the form of struvite precipitation; on the other hand, the formed precipitate is conducive to anaerobic Granular growth and enrichment of ammonia oxidizing bacteria. The invention utilizes a novel short-range denitrification and anaerobic ammonium oxidation coupled denitrification process to simultaneously remove nitrogen pollutants in sludge and sewage, realize nitrogen and phosphorus resource recovery, and have important economic and environmental benefits.

Description

technical field [0001] The invention relates to a process technology for alkaline sludge fermentation to strengthen nitrate wastewater autotrophic denitrification and simultaneous phosphorus recovery, belonging to the field of sewage biological treatment. Background technique [0002] With the continuous increase of sewage treatment capacity in my country, the sludge output of urban sewage treatment plants is also increasing. By the end of 2017, the sludge production of sewage treatment plants in my country exceeded 40 million tons (according to the water content of 80% per 10,000 tons of sewage treated) 5 to 8 tons of sludge is calculated). Activated sludge has complex components and contains a large amount of organic pollutants, bacterial cells and other harmful substances. If it is not properly treated and discharged into the environment, it will cause serious secondary pollution to soil, surface water and groundwater. On the other hand, nutrients such as organic matter, ...

AI Technical Summary

Problems solved by technology

However, there are still some limitations in the practical application of anaerobic ammonium oxidation technology. The substrates of the reaction process are ammonia nitrogen and nitrite. Wastewater, metal smelting industrial wastewater, ion exchange concentrated wastewater, etc., anaerobic ammonia oxidation technology cannot be directly applied to the denitrification treatment of such wastewater

The traditional biological denitrification method needs to add a large amount of organic carbon sources to treat nitrate wastewater, which not only consumes organic resources, but also produces a large amount of excess sludge, which increases the cost and energy consumption of sludge treatment and disposal.

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