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

An autotrophic denitrification and activated sludge technology, applied in biological treatment devices, chemical instruments and methods, biological water/sewage treatment, etc., can solve problems such as difficulty in simultaneously meeting nitrogen and phosphorus effluent standards, increasing operating costs, and consuming large amounts of energy , to achieve the effect of reducing aeration energy consumption, reducing operating costs and saving energy

Active Publication Date: 2021-11-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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

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specific Embodiment approach 1

[0030] Specific implementation mode one: combine figure 1 As shown, the present embodiment relates to a kind of compound fixed biofilm-activated sludge autotrophic denitrification device based on continuous flow A / A / O dephosphorization and partial denitrification series, which is characterized in that the main body of the process is composed of urban sewage raw water tank ( 1), a continuous flow A / A / O dephosphorization partial denitrification device (2), an intermediate water tank (3), and a composite fixed biofilm-activated sludge autotrophic denitrification device (4) consist of four parts; Water inlet pipe (1.1), overflow pipe (1.2) and vent pipe (1.3) are set on the urban sewage raw water tank (1); described continuous flow A / A / O dephosphorization and partial denitrification device (2) It is divided into four areas by the open-hole partition, which are anoxic area (2.1), anaerobic reaction area (2.2), two-stage aerobic reaction area (2.3) and precipitation area (3) in sequ...

specific Embodiment approach 2

[0031] Specific embodiment two: This embodiment relates to an application method based on continuous flow A / A / O dephosphorization and partial denitrification series compound fixed biofilm-activated sludge autotrophic denitrification device, which is carried out according to the following steps:

[0032] 1. Inoculation sludge stage

[0033] Inoculate the phosphorus removal sludge in the continuous flow A / A / O phosphorus removal and partial nitrogen removal reactor, control the sludge concentration MLSS to 2000-4000mg / L, take the actual urban domestic sewage as the treatment object, and the sludge reflux ratio is 100 %-150%, the DO concentration in the aerobic reaction zone is not less than 2mg / L. The design value of hydraulic retention time is 0.5-1.0h in the anoxic zone, 0.5-1.0h in the anaerobic zone, 1.5-2.5h in the aerobic zone, and the sludge age SRT is 3-5d. The shorter HRT and SRT ensure continuous The phosphorus-accumulating bacteria in the flow A / A / O phosphorus removal...

specific Embodiment approach 3

[0042] Specific embodiment 3: The difference between this embodiment and the specific embodiment is that the perforated partitions are connected to each compartment by staggering upper and lower flow holes according to the direction of water flow; the sedimentation tank adopts a vertical flow type The upper part of the sedimentation tank is cylindrical, and the sludge bucket is a truncated inverted cone with an inclination angle of 60°. It adopts the method of central water inlet and peripheral triangular weir outlet. Other steps and parameters are the same as those in Embodiment 1.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/10
CPCC02F1/52C02F3/308C02F3/34C02F2101/105C02F2101/16C02F2203/006C02F2209/14C02F2209/15C02F2209/16C02F2209/18C02F2209/22C02F2209/44C02F2301/046C02F2301/08
Inventor 彭永臻王梓豪张亮
Owner BEIJING UNIV OF TECH
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