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, the digestion 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 waste water with low carbon-to-nitrogen (C / N) ratio and high concentration ammonia nitrogen, and specifically relates to a short-range nitrification reaction of digested liquid rich in ammonia nitrogen sludge in urban sewage plants through dynamic control, and then without organic carbon. In the presence of nitrogen sources, the nitrogen in the digestive juice is removed by Anammox (ANAMMOX, Anaerobic Ammonia Oxidation) to complete the autotrophic biological denitrification, which is suitable for low C / N ratio of high ammonia nitrogen wastewater biological nitrogen removal. Background technique [0002] my country's water pollution continues to intensify, and the phenomenon of eutrophication caused by the excessive accumulation of nitrogen and phosphorus in natural water bodies continues to erupt. Social development. Therefore, improving the denitrification efficiency of ur...

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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