Method for treating high ammonia-nitrogen wastewater by complete nitrification-sludge fermentation coupling short-cut denitrification/anaerobic ammoxidation biofilm technology

Abstract

The invention discloses a method for treating high ammonia-nitrogen wastewater by complete nitrification-sludge fermentation coupling short-cut denitrification / anaerobic ammoxidation biofilm technology, and belongs to the field of sewage sludge treatment. A device includes an original water tank, a complete nitrification reactor (CNR), an intermediate pool, a mud storage pool, a sludge fermentation coupling short-cut denitrification / anaerobic ammoxidation biofilm reactor (SFPDA-BR) and an automatic control system. The sludge fermentation coupling short-cut denitrification / anaerobic ammoxidation biofilm reactor is provided with a padding ball, a three-phase separator and other devices. The method includes the steps that the high ammonia-nitrogen wastewater with 200-400 mg / L concentration ofNH4<+>-N firstly enters the CNR from the original water tank for complete nitrification, the CNR drains the water to the intermediate pool, the CNR discharges mud to mud storage pool, the water of the intermediate pool and the mud of the mud storage pool are together fed into the SFPDA-BR, and sludge fermentation, short-cut denitrification and anaerobic ammoxidation denitrification are simultaneously conducted. The method is suitable for advanced treatment of the high ammonia-nitrogen wastewater, the denitrification process does not require an external carbon source, and finally, the aims ofcarbon source development, short-cut denitrification and anaerobic ammoxidation coupling in sludge are realized.

Description

technical field [0001] The invention relates to a method for treating high-ammonia-nitrogen wastewater with a short-range denitrification / anammox biofilm process coupled with whole-process nitrification-sludge fermentation, and belongs to the field of biological treatment of sewage sludge. This technology is suitable for the enhanced biological denitrification treatment of high ammonia nitrogen wastewater with low carbon-to-nitrogen ratio (C / N≤5) and the reduction of excess sludge. Background technique [0002] Many high ammonia nitrogen concentrations (NH 4 + -N concentration is 200-400mg / L) waste water, there is the problem of insufficient carbon source, thus can't meet the demand of denitrification. Existing sewage biological treatment systems usually supplement organic matter by adding external carbon sources, which not only increases treatment costs, but also exacerbates CO in water plants. 2 Emissions and generation of excess sludge. The treatment of a large amount...

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Problems solved by technology

However, the slow growth of anammox bacteria, the difficulty of enrichment, and the long start-up time of the process limit the application of the anammox process.

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