Device and method for treating domestic sewage by short-cut denitrification-sludge fermentation coupled anaerobic ammonia oxidation system

Abstract

The invention provides a device and method for treating domestic sewage by a short-cut denitrification-sludge fermentation coupled anaerobic ammonia oxidation system, and belongs to the field of sewage sludge biological treatment. The domestic sewage enters a sequencing batch SBR reactor through a water inlet pump, under the action of nitrifying bacteria, all ammonia nitrogen in influent water isconverted into nitrate nitrogen, effluent water enters an upflow anaerobic sludge blanket (UASB) reactor, remaining sludge is periodically added into the UASB reactor, short-cut denitrifying bacteriautilize organic matter generated by in-situ fermentation of the sludge to reduce the nitrate nitrogen in the influent water into nitrite nitrogen, the nitrite nitrogen and ammonia nitrogen generated by the in-situ fermentation of the sludge are reacted to form nitrogen and partial nitrate nitrogen under the action of anaerobic ammonium oxidizing bacteria on a filler, and in the whole process, thedenitrifying bacteria utilize the organic matter generated by the in-situ fermentation of the sludge to reduce the nitrate nitrogen and the remaining nitrite nitrogen into nitrogen. The device and method provided by the invention are suitable for treating the domestic sewage with a low C / N ratio, and can utilize short-cut denitrification-sludge fermentation coupled anaerobic ammonium oxidation torealize advanced denitrification of the domestic sewage and realize sludge reduction, thereby achieving the purpose of saving energy and reducing consumption.

Description

technical field [0001] The invention relates to a device and method for the whole-process nitrification, short-range denitrification-sludge fermentation coupling anaerobic ammonium oxidation treatment of domestic sewage, which belongs to the technical field of sewage sludge biological treatment and is suitable for deep desorption of urban domestic sewage with low C / N ratio. Nitrogen, which has the characteristics of energy saving, consumption reduction and sludge reduction. Background technique [0002] At present, my country's sewage treatment plants generally face two major problems: the difficulty of treating water up to the first-class A discharge standard, and the difficulty of saving energy and reducing consumption. However, the C / N (COD / TN) ratio of urban domestic sewage in my country is generally low. In traditional sewage There is a problem of insufficient carbon source in the biological denitrification process of the treatment plant, and an external carbon source is...

AI Technical Summary

Problems solved by technology

First, the growth of anammox bacteria is slow, the generation cycle is long, and enrichment is difficult; second, the water temperature of most sewage treatment plants in my country is low, which is not suitable for the growth of anammox bacteria; third, the bottom of anammox One of the substances, nitrite nitrogen, is difficult to accumulate stably in the operation of large-scale actual water plants.

Therefore, it is still very difficult to realize the application of anaerobic ammonium oxidation process in actual engineering.

Images