Device and method for autotrophic denitrification of activated sludge based on continuous flow aao for phosphorus removal and partial denitrification

Abstract

The invention relates to a continuous-flow AAO dephosphorization and partial denitrification series composite fixed biofilm activated sludge autotrophic denitrification device and a method thereof, which belong to the technical field of urban sewage biological treatment. The main body of the process is composed of four parts: urban sewage raw water tank, continuous flow AAO dephosphorization partial denitrification device, intermediate water tank and composite fixed biofilm-activated sludge autotrophic denitrification device. Through process adjustment, the remaining short-path sludge in the back-end autotrophic denitrification reactor is continuously refluxed through the sludge circulation system under the condition that the basic characteristics of the main organism population phosphorus accumulating bacteria in the AAO reactor are not destroyed. to the AAO reactor. Therefore, the denitrification effect of the front and rear stages can be realized at the same time, and the reactor volume required for treating unit volume of waste water can be further reduced. At the same time, under the conditions of high temperature, low oxygen and low sludge age, NOB in the autotrophic denitrification reactor can be effectively elutriated, making the short-range effect more stable. Finally, the energy-saving, efficient and stable nitrogen and phosphorus removal of the system will be 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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