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An AAO oxidation ditch real-time control system and its sewage treatment method

A real-time control and oxidation ditch technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, biological treatment adjustment methods, etc. To achieve the effect of strengthening the effect, optimizing the quantity and operation mode, and reducing the operation cost

Active Publication Date: 2015-09-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of sludge deposition in the operation of AAO oxidation ditch, poor denitrification and dephosphorization effects, resulting in water not being able to reach the standard stably, and high energy consumption, the present invention proposes a real-time control system for AAO oxidation ditch and its control and processing method. The AAO oxidation ditch improves the equipment, ditch type and device, and regulates the operation mode, and establishes a real-time control system for the AAO oxidation ditch based on the change of influent water, so as to achieve the goals of strengthening nitrogen and phosphorus removal, stable effluent compliance, energy saving and consumption reduction

Method used

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  • An AAO oxidation ditch real-time control system and its sewage treatment method
  • An AAO oxidation ditch real-time control system and its sewage treatment method
  • An AAO oxidation ditch real-time control system and its sewage treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: High temperature period (>25°C):

[0055] The initial state of each aeration turntable is: A# aeration turntable speed 80r / min, B# aeration turntable speed 100r / min, C# aeration turntable speed 80r / min. The three aeration turntables are all continuously variable speed control; the initial value of the sludge reflux ratio R is 80%; the mixed liquid reflux ratio r from the anoxic tank to the anaerobic tank 1 70%; the reflux ratio of the nitrification liquid from the oxidation ditch to the anoxic tank r 2 150%; the water inlet state is a single point water inlet of the anaerobic tank.

[0056] Based on this, the following conditions are regulated:

[0057] a. The reading of DO monitor I<1.0mg / L

[0058] Increase the rotation speed of the B# aeration turntable by 10r / min, continue for 1h, and then monitor again. If it is still below the normal range, increase it by 50r / min, and repeat the process until the maximum rotation speed does not exceed 130r / min.

[0059] b. The r...

Embodiment 2

[0076] Example 2: Low temperature period (<15°C):

[0077] The initial state of operation of each aeration turntable is: A# aeration turntable speed 100r / min, B# aeration turntable speed 100r / min, C# aeration turntable speed 100r / min. All three aeration turntables are infinitely variable speed control. The initial value of sludge reflux ratio is 80%; the nitrification liquid reflux ratio is 250%; multi-point water inflow is adopted, and the ratio of anaerobic tank and anoxic tank is 7:3; the mixed liquid from anoxic tank to anaerobic tank is returned The ratio is 70%.

[0078] Based on this, the following conditions are regulated:

[0079] a. The reading of DO monitor I<1.0mg / L

[0080] Increase the rotation speed of the B# aeration turntable by 10r / min, continue for 1h, and then monitor again. If it is still below the normal range, increase it by 10r / min, and repeat the process until the maximum rotation speed does not exceed 130r / min.

[0081] b. The reading of DO monitor I>2.0mg / L...

Embodiment 3

[0098] Example 3: Normal temperature period (15-25°C):

[0099] The initial state of operation of each aeration turntable is: A# aeration turntable speed 100r / min, B# aeration turntable speed 100r / min, C# aeration turntable speed 100r / min. All three aeration turntables are infinitely variable speed control. The initial value of the sludge reflux ratio is 80%; the nitrification liquid reflux ratio is 200%; the water inlet state is a single-point water inlet; the mixed liquid reflux ratio from the anoxic zone to the anaerobic zone is 70%.

[0100] Based on this, the following conditions are regulated:

[0101] a. The reading of DO monitor I<1.0mg / L

[0102] Increase the rotation speed of the B# aeration turntable by 10r / min, continue for 1h, and then monitor again. If it is still below the normal range, increase it by 10r / min, and repeat the process until the maximum rotation speed does not exceed 130r / min.

[0103] b. The reading of DO monitor I>2.0mg / L

[0104] Decrease the rotation sp...

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Abstract

The invention discloses a real-time AAO oxidation ditch regulation system and a sewage treatment method thereof. The method comprises the following steps: denitrifying mixed solution in an anoxic pond and refluxing the denitrified mixed solution into an anaerobic tank to perform anaerobic phosphate release with raw water, so that the influence of nitrate on the anaerobic phosphate release in the traditional AAO process is overcome; entering the mixed solution in the anoxic pond, the returned sludge in a secondary sedimentation tank and return nitrification liquor in the oxidation ditch into the anoxic pond together, and performing nitrogen removal by denitrification; entering the mixed solution in the anoxic pond into the oxidation ditch, and creating an aerobic-anoxic alternative environment by virtue of regulation, so that simultaneous nitrification and denitrification are performed in the ditch, and a denitrification effect is enhanced; and regulating the aeration mode, reflux ratio and the like in real time according to signals acquired by each online monitor by using a PLC control system. The traditional AAO oxidation ditch is subjected to structure and equipment transformation and operating mode regulation, a set of real-time regulation system based on water inflow change is established, the problems such as sludge deposition, poor nitrogen and phosphorus removal effect and high energy consumption existing in the AAO oxidation ditch are solved, and the aims of allowing the effluent to stably reach the standard, saving the energy and reducing the consumption are achieved.

Description

Technical field [0001] The invention belongs to the field of environmental protection, and specifically relates to an AAO oxidation ditch real-time control system and a sewage treatment method thereof. Background technique [0002] AAO (Anaerobic-Anoxic-Oxic) process is a combination of anaerobic-aerobic phosphorus removal system and anoxic-aerobic nitrogen removal system. It is composed of anaerobic tank, anoxic tank and aerobic tank, also known as anaerobic tank. The oxygen-anoxia-aerobic method is the basic process of biological nitrogen and phosphorus removal. The hydraulic retention time of this process is less than that of other similar processes. The anaerobic / anoxic / aerobic alternate operation effectively avoids sludge expansion. The SVI value is generally less than 100; the reflux ratio of the mixed liquid in this process is often larger, so it has High power consumption, in addition, because a large amount of organic matter is used in the anaerobic section, the carbon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/006C02F3/308C02F2101/105C02F2101/16C02F2209/005C02F2209/04C02F2209/14C02F2209/15C02F2209/22C02F2301/04
Inventor 李柏林梁亚楠李晔章文琴杨丹丹
Owner WUHAN UNIV OF TECH
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