Mineralized refuse packed bed and wastewater denitrification method

Abstract

In order to realize low-cost denitrification of nitrogen-containing wastewater and reasonably utilize the mineralized refuse, the invention provides a mineralized refuse packed bed and a method of removing the nitrogen in the nitrogen-containing wastewater based on the mineralized refuse packed bed. The blockage problem of the packed bed is solved by lowering BOD5 in inlet water, cooperation of partial nitrification and the anaerobic ammonia oxidation is realized by an additionally-arranged vent pipe, and the treatment efficiency is guaranteed by use of a thermal insulation layer, so that the mineralized refuse packed bed is a mineralized refuse packed bed which has low energy consumption, low cost and low carbon footprint. Besides, the wastewater denitrification method is a nitrogen-containing wastewater denitrification treatment method.

Description

technical field [0001] The invention relates to a mineralized garbage packing bed and a method for removing nitrogen from nitrogen-containing waste water based on the mineralized garbage packing bed. Background technique [0002] Nitrogen-containing pollutants include nitrogen-containing organic matter, nitrate, nitrite, and ammonia nitrogen. Controlling the discharge of nitrogen-containing pollutants to natural water bodies is an important means of controlling water eutrophication. The Chinese government has imposed strict restrictions on the discharge of ammonia nitrogen. There are more than 40 pollutant discharge standards involving ammonia nitrogen limits, and more than 20 industry standards. In addition, some standards involve the control of nitrate nitrogen and nitrite nitrogen. With the continuous improvement of environmental requirements, there will be more standards involving nitrate nitrogen and nitrite nitrogen. The eutrophication of China's water bodies is serio...

AI Technical Summary

Problems solved by technology

However, there are still the following defects: since the concentration of ammonia nitrogen in the wastewater is as high as 2000 mg / L, in order to remove all the ammonia nitrogen in the anammox stage through the anaerobic ammonium oxidation reaction, at least 1000 mg / L of ammonia nitrogen needs to be oxidized into NO X -, which will cause higher nitrite accumulation, and consume a large amount of alkalinity to cause a drop in pH. The combined action of the two will cause serious substrate inhibition to the anammox reaction; A large amount of alkalinity is generated, which makes the pH at the bottom of the anammox reactor high, which also affects the efficiency and stability of the anammox reactor; BOD in wastewater 5 The high concentration makes the heterotrophic microorganisms compete with the autotrophic microorganisms in the pretreatment mineralized waste bed. Since nitrifying bacteria and anammox bacteria are all autotrophic bacteria, their growth is inhibited; at the same time, the reproduction of a large number of heterotrophic microorganisms It makes the stuffing clogged and needs to be dredged irregularly, which reduces the operating efficiency and treatment effect; in addition, because no insulation and heating measures are used, it must be operated in a high temperature environment, which limits the application of this technology

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