Pneumatic Mixed Liquor Elevator for Sewage Treatment
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Solution Overview
Problem
Existing biological sewage treatment systems face challenges with high energy consumption, reliability issues, and inflexibility due to the use of sludge return pumps and inefficient separation of mixed liquor in tower-type systems, leading to poor treatment efficiency and increased costs.
Innovation Solution
An apparatus and method utilizing a pneumatic mixed liquor elevating device that uses aeration gas to drive the concentrated mixed liquor, integrating an anaerobic treatment section, aeration section, and sedimentation section to enhance nitrogen removal and COD removal by contacting the mixed liquor with oxygen-containing gas, eliminating the need for sludge return pumps and optimizing gas utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sludge return pump is used to return concentrated mixed liquor to the aeration tank, then the sludge return function is achieved, but energy consumption increases and maintenance requirements increase
Solution Approach 1:
The invention extracts and eliminates the sludge return pump from the system by using the aeration tank's own aeration gas to drive the concentrated mixed liquor back to the aeration tank through a gas-liquid separator and return pipeline, thereby removing the energy-consuming and maintenance-requiring mechanical pump while maintaining the sludge return function
Solution Approach 2:
The aeration tank serves itself by using its own aeration gas to drive the sludge return process, eliminating the need for external energy input from a separate pump. The system uses its operational byproduct (aeration gas) to perform the additional function of sludge circulation
2Reliability
If an electric sludge return pump is used, then sludge return is achieved, but insulating treatment is required to prevent electricity leakage, increasing device complexity
Solution Approach 1:
The invention replaces the electric pump with a pneumatic drive system using aeration gas to propel the concentrated mixed liquor. This substitution eliminates electrical components from the sludge return line, removing the need for insulating treatments and electrical safety measures while maintaining the sludge circulation function
3Reliability
If a sludge return pump is used, then sludge return is achieved, but a large amount of pipelines and connections are required, increasing equipment investment
Solution Approach 1:
The invention merges the sludge return function with the existing aeration gas distribution system. The aeration gas that would otherwise be discharged is redirected to drive the sludge return through shared pipelines and connections, reducing the need for separate dedicated sludge return infrastructure
4Productivity
If the aeration gas is discharged directly to atmosphere after aeration treatment, then the aeration process is completed, but energy and oxygen in the aeration gas are not sufficiently utilized, increasing energy consumption
Solution Approach 1:
The invention recovers the energy and oxygen content in the aeration gas that would otherwise be discarded to the atmosphere. The aeration gas is captured and utilized to drive the concentrated mixed liquor back to the aeration tank, converting a waste stream into a useful resource for sludge circulation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces energy consumption, improves treatment efficiency, and enhances nitrogen and COD removal, providing a more reliable and flexible biological sewage treatment process with reduced equipment investment and improved water quality.
Implementation Method 1
a pneumatic mixed liquor elevating device that uses aeration gas to drive the concentrated mixed liquor
Implementation Method 2
a mixed liquor is aerated in an aeration tank
Implementation Method 3
contacting the mixed liquor with oxygen-containing gas
Implementation Method 4
separated in a sedimentation tank to form a supernatant and a concentrated mixed liquor
Data Source
AI summary
An apparatus comprises a concentrated mixed liquor driving device which uses a gas for driving the concentrated liquor to flow The gas can be an oxygen-containing gas, especially an oxygen-containing aeration gas after aeration treatment. Also provided is a method for biological sewage treatment, which comprises a step of using the gas for driving the concentrated mixed liquor to flow.