Device and method for treating high-nitrate wastewater and excess sludge

Abstract

The invention belongs to the technical field of biological sewage treatment, and relates to a device and a method for treating high-nitrate wastewater and excess sludge. The method comprises the following steps: firstly, carrying out anaerobic fermentation on the sludge to generate volatile fatty acid (VFAs); then carrying out short-cut denitrification reaction by using the VFAs as an internal carbon source under an anoxic condition; and finally, carrying out anaerobic ammonium oxidation reaction via anaerobic ammonium oxidation bacteria which use ammonia nitrogen generated by anaerobic fermentation and nitrite nitrogen generated by short-cut denitrification as substrates so as to generate nitrogen and nitrate nitrogen. Thus, the aims of deep denitrification and sludge reduction are fulfilled, and the two problems of insufficient denitrification carbon sources and high residual sludge yield of a sewage plant at present are solved.

Description

Technical field: [0001] The invention belongs to the technical field of sewage biological treatment, and relates to a device and method for treating high-nitrate wastewater and excess sludge. The single-stage UABR sludge fermentation synchronous short-range denitrification ammonium oxidation is used to treat high-nitrate wastewater and excess sludge. Background technique: [0002] Nitrate pollutants mainly come from tannery, chemical wastewater, drainage from biochemical treatment facilities and farmland drainage. It can also be produced by the oxidation of nitrogen-containing organic matter or the action of microorganisms. Nitrate pollution leads to eutrophication of water bodies and a decline in water quality; excessive nitrate concentrations in water bodies will lead to a series of environmental risks, which will indirectly affect human health, such as increasing the risk of human beings suffering from methemoglobin, so eliminate pollution caused by nitrates Particularly...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, aiming at the problems of low carbon-to-nitrogen ratio of influent and difficult disposal of excess sludge, to provide a single-stage UABR for synchronous short-range denitrification and ammonia oxidation treatment of high nitrate in sludge fermentation The device and method for waste water and excess sludge enable sludge fermentation, short-range denitrification and anammox to be carried out in the same reactor, which greatly reduces the area occupied by the reactor. First, the sludge is anaerobically fermented to produce Volatile fatty acids (VFAs), and then use VFAs as an internal carbon source for short-range denitrification under anoxic conditions, and finally anammox bacteria use ammonia nitrogen produced by anaerobic fermentation and nitrite nitrogen produced by short-range denitrification as The anaerobic ammonium oxidation reaction of the substrate produces nitrogen and nitrate nitrogen, so as to achieve the purpose of deep denitrification and sludge reduction

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