Combined denitrification apparatus and method by shortcut nitrification and anaerobic ammonium oxidation of sludge-digestion liquid

Abstract

The invention discloses a device for autotrophic nitrogen removal by combining A / O shortcut nitrification of sludge digestion liquid and anaerobic ammonium oxidation of granular sludge and a method thereof. The device of the invention comprises a digestion liquid tank, an A / O shortcut nitrification tank, a sedimentation tank, a middle water tank, an anaerobic ammonium oxidation tank, wherein, thedigestion liquid tank is communicated with a first cancellus as an anoxic zone of the A / O shortcut nitrification tank by the inlet pump of the A / O shortcut nitrification tank; the sedimentation tank the upper part of which is communicated with the middle water tank by a water pipe is provided with a central pipe and the anaerobic ammonium oxidation tank is provided with a water bath sleeve and a granular sludge bed. In addition, the method of the invention comprises the following steps of starting the A / O shortcut nitrification tank; starting the anaerobic ammonium oxidation tank of the granular sludge; operating an autotrophic biological nitrogen removal system in series after the starting of the A / O shortcut nitrification tank and the anaerobic ammonium oxidation tank is respectively completed. The device and the method of the invention are applicable to the shortcut nitrification and the nitrogen removal of the sludge digestion liquid in a sewage treatment plant and have the advantages of advanced technology, simple structure of the device, convenient operation and good treatment effect of water purification.

Description

Technical field [0001] The invention belongs to the technical field of biological denitrification of wastewater with low carbon to nitrogen (C / N) ratio and high concentration of ammonia nitrogen, and specifically relates to a short-cut nitrification reaction of the digestive liquid of sludge rich in ammonia nitrogen in urban sewage plants through dynamic control, and then no organic carbon is required. Under the condition of the source, the anaerobic ammonia oxidation reaction (ANAMMOX, Anaerobic Ammonia Oxidation) removes the nitrogen in the digestive solution to complete the autotrophic biological denitrification. It is suitable for sludge digestion, late landfill leachate and coking wastewater and other low-C / N ratio of biological denitrification of wastewater with high ammonia nitrogen. Background technique [0002] my country’s water pollution continues to increase, and eutrophication caused by the excessive accumulation of nitrogen and phosphorus in natural water bodies co...

AI Technical Summary

Problems solved by technology

The existing biochemical treatment process treats the reflux of sludge digestion liquid and raw water together, which greatly increases the nitrogen load of sewage treatment, making it difficult to improve the efficiency of nitrogen and phosphorus removal

The metabolic characteristics of anaerobic digestion of sludge and the traditional process of returning sludge digested liquid directly to the sewage system is a major but often overlooked crux of the low denitrification efficiency of many sewage treatment plants

For low C / N sludge digestate, the serious lack of organic carbon source is the barrier that cannot improve its denitrification efficiency, and the addition of organic carbon source will greatly increase the cost of sewage denitrification

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