Step-feed biological nitrogen removal and sludge reduction coupling bioreactor and process thereof

Abstract

The invention relates to a step-feed biological nitrogen removal and sludge decrement coupling bioreactor and a process thereof, belonging to the field of sewage treatment and aiming to overcome the technical defect that the sludge output is large, and the total nitrogen removal effect of sewage with a low carbon-nitrogen ratio is poor. The bioreactor sequentially comprises a biological reaction area and a secondary clarifier, wherein a biological reaction area sequentially comprises an aerobic area, an anoxic area, an aerobic area, an anoxic area, an aerobic area, an anoxic area, an aerobic area and an anoxic area, and the volume ratio of each aerobic area to each anoxic area is (1.5:1)-(2:1); a porous carrier is arranged inside the biological reaction area; the carrier filling volume ratio of the aerobic areas is 40-60 percent, and the carrier filling volume ratio of the anoxic area is 90-100 percent; and all the areas are respectively provided with a baffle plate. The bioreactor is divided into three water inlet stages, the secondary clarifier is provided with a water outlet pipe and a sludge discharge pipe, and backflow sludge is conveyed to the aerobic areas O-I through a pump. The TN removal ratio of the bioreactor is 75.3 percent, the COD removal ratio is 94.3 percent, and the sludge productivity is 0.102kgMLSS / kgCOD.

Description

technical field [0001] The invention relates to a segmented water inlet coupling bioreactor and a process thereof, which has the effect of biological denitrification and sludge reduction by adding a porous carrier, and belongs to the field of sewage treatment. Background technique [0002] With the rapid development of my country's social economy and the continuous improvement of industrialization and urbanization, my country's water environment pollution and water eutrophication are becoming more and more serious. Many lake water bodies can no longer perform their normal functions and seriously affect industry and agriculture. And fishery production, more and more seriously hindered the development of our country's national economy. Nitrogen is the main pollutant that causes eutrophication in water bodies, and it is particularly important to control the total nitrogen content in discharged sewage. Sewage biological treatment technology has always played a huge role in the p...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of large sludge output and low total nitrogen removal rate in sewage treatment plants, from the two technical aspects of improving sewage treatment effect and reducing sludge yield, and from the economical aspects of reducing construction cost and saving energy consumption and operating costs On the one hand, the research and invention of this device and process can achieve a better denitrification effect while reducing the amount of sludge

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