Aerobic Granular Sludge Culture via Multi-Point Water Distribution
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Solution Overview
Problem
Existing methods for culturing aerobic granular sludge face challenges in rapid culture and stability, particularly in low organic load municipal sewage, leading to disintegration and impaired biological phosphorous removal and denitrification.
Innovation Solution
A system and method involving multi-point uniform water distribution, aeration, and a feast-hunger strategy to enhance culture efficiency, incorporating a reaction tank with specific units for water intake, aeration, and sludge discharge, and periodic operations to stabilize granular sludge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid water intake method is used to culture aerobic granular sludge, then culture speed is improved, but sludge stability deteriorates and granular sludge easily disintegrates
Solution Approach 1:
The water intake process is segmented into multiple points distributed throughout the reactor rather than a single rapid intake. This segmentation allows water to be added gradually at different locations, preventing sudden dilution and maintaining sludge stability while still achieving rapid culture through distributed water distribution.
Solution Approach 2:
The patent implements periodic water intake operations where water is added in controlled cycles rather than continuously or all at once. This periodic action allows the sludge to adapt to water addition gradually, maintaining structural integrity while enabling rapid culture development through repeated feeding cycles.
2Ease of operation
If single-point water intake is used, then operation simplicity is improved, but organic load is diluted and culture efficiency deteriorates
Solution Approach 1:
The water intake system is segmented into multiple injection points distributed throughout the reactor volume. This segmentation ensures that organic load is not diluted at any single location but is instead distributed throughout the entire sludge mass, significantly improving culture efficiency while maintaining operational simplicity through automated multi-point delivery.
Solution Approach 2:
The patent transitions from single-point (zero-dimensional or one-dimensional) water intake to multi-point three-dimensional water distribution throughout the reactor volume. This dimensional expansion ensures uniform organic load distribution and maximizes contact between substrate and microorganisms, dramatically improving culture efficiency.
3Speed
If high organic load is used to enhance culture, then culture speed is improved, but system complexity increases due to additional treatment requirements
Solution Approach 1:
The patent introduces an intermediary water distribution system that mediates between the high organic load requirement and the reactor environment. This intermediary system delivers substrate uniformly across multiple points, enabling high organic load culture without requiring complex single-point injection systems or causing harmful local concentrations.
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 method shortens culture time, improves sludge stability, and enhances operational efficiency, making it suitable for engineering applications.
Implementation Method 1
The aeration unit includes a blower, microporous aerators, and a gas flowmeter. There are a plurality of microporous aerators, and the plurality of microporous aerators are arranged at the bottom of the reaction tank
Implementation Method 2
There are a plurality of microporous aerators, and the plurality of microporous aerators are arranged at the bottom of the reaction tank
Implementation Method 3
There are a plurality of buffers, and the plurality of buffers are arranged at the bottom of the reaction tank, and used for buffering the water intake of the sewage uniform distribution treatment device
Implementation Method 4
the sewage uniform distribution treatment device is arranged in the reaction tank, and used for realizing water intake and water drainage of the system
Data Source
AI summary
The present disclosure belongs to the technical field of sewage treatment, and discloses a method and system for enhanced culture of aerobic granular sludge. The system includes a reaction tank, a water inlet and outlet unit, an aeration unit, and a sludge discharge unit. The water inlet and outlet unit includes a water inlet pump, a water inlet electric valve, a liquid flowmeter, a sewage uniform distribution treatment device, buffers, a water drainage pipe, and a water drainage electric valve. The aeration unit includes a blower, microporous aerators, and a gas flowmeter. The sludge discharge unit includes sludge discharge pumps, a sludge discharge pipe, a sludge discharge electric valve, and a sludge concentration meter. In the present disclosure, a multi-point uniform water distribution method is used. When the flow rate of influent water is adjusted, sewage slowly and uniformly flows through a sludge layer from the bottom of the system, so that the concentration of organic matter in raw water is prevented from being rapidly reduced by rapid single-point water intake, the utilization rate of the organic matter in the sewage is increased to the maximum extent, and the efficiency of the system is improved.