Shared-Structure Orbal Oxidation Ditch for High Denitrification
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Solution Overview
Problem
The existing Orbal oxidation ditch systems face challenges in achieving high-denitrification efficiency due to limited space and high investment costs, inadequate denitrification systems, and inefficient media circulation, which restricts their widespread application in wastewater treatment.
Innovation Solution
A high-denitrification shared type Orbal oxidation ditch design that integrates a secondary deposition tank with the outer, median, and inner channels, prolongs the outer channel length, and incorporates an inner and outer re-circulation zone with underwater propellers to enhance wastewater residence time and denitrification efficiency, while reducing space and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a separate denitrification system is established in the Orbal oxidation ditch, then denitrification efficiency is improved, but device complexity and investment cost increase
Solution Approach 1:
The patent combines the denitrification function with the existing outer channel structure by creating a shared wall between the outer channel and the secondary deposition tank. This merging approach allows the outer channel to serve both as a flow path and as a denitrification zone, eliminating the need for a completely separate denitrification system while maintaining effective nitrogen removal capability.
Solution Approach 2:
The outer channel is designed to perform multiple functions simultaneously: it serves as a water flow channel, a denitrification zone through the shared wall structure, and part of the overall oxidation ditch circulation system. This multi-functionality reduces the need for dedicated separate systems while achieving the required denitrification efficiency.
2Productivity
If the outer channel volume is increased to improve media circulation, then circulation effectiveness is improved, but the spacing between aeration turntables becomes too narrow, reducing nitrification and denitrification effects
Solution Approach 1:
The patent extends the outer channel in the longitudinal direction (along the ellipse's longer axis) rather than expanding it radially. This dimensional change allows increased circulation path length and improved media circulation times while maintaining adequate spacing between aeration turntables, as the extension occurs along the length of the channel rather than compressing the lateral spacing.
3Area of stationary object
If a secondary deposition tank is integrated with the outer channel, then space occupation and investment cost are reduced, but the structural complexity of shared walls increases
Solution Approach 1:
The secondary deposition tank is merged with the outer channel by sharing a common wall structure. This integration allows the two functional units to occupy the same physical space, reducing the overall footprint and eliminating the need for separate construction of independent tanks, thereby reducing both space occupation and investment cost despite the increased structural integration.
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
This design significantly increases denitrification efficiency, reduces operational costs, and enhances nitrification and denitrification effects by optimizing space usage and circulation times within the oxidation ditch.
Implementation Method 1
an inner re-circulation zone is arranged in the intermediate space or partial intermediate space between the outer wall of the median channel, the inner wall of the outer channel and the secondary deposition tank, wherein the inner re-circulation zone that is communicated with the water in the pipe of the inner channel is connected with the weir-flow weir of the secondary deposition tank, an underwater sewage propeller (or referred to as re-circulation pump) leading to the outer channel is placed in the inner re-circulation zone
Implementation Method 2
the outer channel covers more than 50% of the total oxidation ditch in volume, which results in the reduction of media circulation times, and particularly, too narrow spacing between the aeration turntables set on the outer channel creates unobvious diversities between aerobic-anaerobic-aerobic . . . , unobvious nitrification and denitrification effects
Implementation Method 3
unobvious nitrification and denitrification effects, and unobvious denitrification effect apparently, thus removing the total nitrogen only a little
Data Source
AI summary
A high denitrification shared type Orbal oxidation ditch, pertaining to water treatment technical field, comprises an outer channel, a median channel, an inner channel, all of ellipse, and a secondary deposition tank. Wherein, the length of the outer channel is prolonged in the ellipse's major axis direction and the secondary deposition tank that is tangential to the inner wall or shares the wall with the outer channel is arranged between the outer and median channels. All the channels (the outer channel, the median channel and the inner channel) and the secondary deposition tank are integrated in the Orbal oxidation ditch, all of the anaerobic zone, regulation zone, hydrolysis acidifying zone, primary deposition zone, sludge outer re-circulation zone and wastewater inner re-circulation zone etc. can also be arranged in other space, in this way, to reduce the area occupied and the investment cost for the entire equipment to the minimum values, prolong the residence time in the oxidation ditch remarkably and make the total denitrification efficiency very high.