Serial composite fixed biofilm and activated sludge autotrophic denitrification apparatus and method on basis of continuous flow AAO phosphorus removal and partial denitrification

Abstract

The invention relates to a serial composite fixed biofilm and activated sludge autotrophic denitrification apparatus on the basis of continuous flow AAO phosphorus removal and partial denitrificationand a method thereof and belongs to the technical field of biological disposal of urban sewage. According to the method, a main process consists of four parts including an urban sewage original watertank, a continuous flow AAO phosphorus removal and partial denitrification device, an intermediate water tank and a composite fixed biofilm and activated sludge autotrophic denitrification device. Through process adjustment, remaining short-range sludge in a back-end autotrophic denitrification reactor is continuously refluxed into an AAO reactor through a sludge circulation system under the condition that basic characteristics of phosphorus accumulating bacteria serving as the main organism population in the AAO reactor are not destroyed, so that the front and back sections both have a denitrification effect, and the size of the reactors required for disposing unit volume of wastewater is further reduced. At the same time, NOB in the autotrophic denitrification reactor can be effectivelyelutriated under the conditions of high temperature, low oxygen content and low sludge age, so that the short-range effect is more stable. Finally, energy-saving, efficient and stable nitrogen and phosphorus removal of the system is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and specifically relates to a device for treating low-carbon source urban sewage based on continuous flow A / A / O dephosphorization and partial denitrification series compound fixed biofilm-activated sludge autotrophic denitrification process It has the characteristics of high efficiency, energy saving, and small footprint, and is suitable for technical fields such as new urban sewage treatment plants. Background technique [0002] In recent years, my country's economy has become increasingly prosperous, industrial and agricultural technology has developed rapidly, and the process of urbanization has accelerated, which has aggravated the problem of water pollution in our country to a certain extent. For example, industrial sewage, farmland drainage, and domestic sewage containing a large amount of nitrogen and phosphorus pollutants are discharged into natural water bodies, causi...

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Problems solved by technology

In traditional nitrogen and phosphorus removal processes, both biological nitrogen and phosphorus removal require the consumption of organic matter

However, the concentration of organic matter in urban sewage in my country is generally low, and the lack of carbon sources makes it difficult for nitrogen and phosphorus effluent to meet the standards at the same time. In order for the effluent to meet the standards, it is often necessary to add exogenous organic matter or chemical phosphorus removal agents, which increases operating costs.

In addition, sewage treatment is a high-energy-consuming industry. The upgrading of urban sewage, sludge return, aeration and mixing of biological reaction tanks, and sludge treatment and disposal all consume a lot of energy.

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