Dual-Circulation Oxidation Ditch Layout for Nitrogen and Phosphorus Removal
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Solution Overview
Problem
Existing wastewater treatment plants face challenges in efficiently removing ammonia nitrogen, COD, BOD, TN, and TP from municipal wastewater, leading to high energy consumption, construction costs, and operational inefficiencies, which threaten water quality and environmental health.
Innovation Solution
An integrated dual circulation oxidization ditch apparatus with anaerobic, anoxic, and aerobic zones, utilizing submersible mixers and reflux pumps, along with self-suction plug-flow aeration, to enhance nitrogen and phosphorus removal, and reduce energy consumption and construction costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional activated sludge process or A2/O process is used, then wastewater treatment capacity is improved, but energy consumption and construction expense increase
Solution Approach 1:
The patent combines anaerobic, anoxic, and aerobic treatment zones into a single integrated oxidization ditch apparatus, merging multiple treatment functions into one unified system. This integration eliminates the need for separate treatment plants, reducing construction expenses while maintaining comprehensive wastewater treatment capacity for COD, BOD, ammonia nitrogen, TN, and TP removal.
Solution Approach 2:
The oxidization ditch apparatus performs multiple treatment functions simultaneously - anaerobic degradation, anoxic denitrification, and aerobic nitrification - within a single system. This multi-functionality allows the apparatus to handle various pollutants (COD, BOD, ammonia nitrogen, TN, TP) comprehensively, improving treatment capacity while avoiding the need for separate specialized treatment systems that would increase energy consumption and construction costs.
2Productivity
If conventional activated sludge process or A2/O process is used, then wastewater treatment capacity is improved, but construction expense increases
Solution Approach 1:
The patent combines anaerobic, anoxic, and aerobic treatment zones into a single integrated oxidization ditch apparatus, merging multiple treatment functions into one unified system. This integration eliminates the need for separate treatment plants, reducing construction expenses while maintaining comprehensive wastewater treatment capacity for COD, BOD, ammonia nitrogen, TN, and TP removal.
3Reliability
If dual circulation oxidization ditch apparatus is used, then nitrogen and phosphorus removal is enhanced, but device complexity increases
Solution Approach 1:
The oxidization ditch is segmented into three distinct functional zones - anaerobic zone, anoxic zone, and aerobic zone - each optimized for specific treatment processes. This segmentation enables effective nitrogen and phosphorus removal through sequential biological processes while maintaining a relatively simple overall apparatus structure that avoids complex mechanical components.
Solution Approach 2:
The patent implements dual circulation systems with reflux pumps that dynamically control flow between different zones based on treatment requirements. The circulation mechanism adjusts hydraulic flow patterns to optimize nitrogen and phosphorus removal efficiency, while the dynamic operation is achieved through standard pumping equipment rather than complex mechanical systems.
4Ease of manufacture
If integrated dual circulation oxidization ditch apparatus is used, then operational costs are reduced, but treatment of high concentration wastewater requires optimization
Solution Approach 1:
The patent applies different operational parameters and biological conditions to each zone - anaerobic conditions in the first zone for phosphorus release, anoxic conditions in the second zone for denitrification, and aerobic conditions in the third zone for nitrification and phosphorus uptake. This local optimization of conditions in each zone enables cost-effective operation while maintaining high treatment efficiency for concentrated wastewater streams.
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 apparatus effectively reduces COD, BOD, ammonia nitrogen, TN, and TP concentrations, achieving high removal rates and lowering operational costs, creating conditions for subsequent nitrogen removal treatments.
Implementation Method 1
under an action of the submersible mixer, the refluxed sludge containing a lot of nitric nitrogen in the aerobic zone is mixed
Implementation Method 2
aeration supplied by the plug flow aeration machine
Implementation Method 3
the wastewater mixed liquid is refluxed to the anoxic zone via the internal reflux pump
Implementation Method 4
The wastewater mixed liquid is anaerobically degraded in an anaerobic zone
Implementation Method 5
a purpose of removing nitric nitrogen in the wastewater mixed liquid mixed stably is achieved in adsorption and metabolic processes of the organic matters by denitrifying bacteria
Implementation Method 6
The treated wastewater is then fed into a secondary sedimentation tank
Data Source
AI summary
Disclosed are an integrated dual circulation oxidization ditch apparatus for municipal wastewater and a treatment method. The apparatus comprises an anaerobic zone, an anoxic zone, an aerobic zone and a secondary sedimentation tank communicated in sequence. The anoxic zone comprises a first anoxic zone and a second anoxic zone. The aerobic zone comprises a first aerobic zone and a second aerobic zone, and a reflux pump is arranged between the anoxic zone and the aerobic zone. The anaerobic zone, the anoxic zone and the aerobic zone are internally provided with submersible mixers. Both the anoxic zone and the aerobic zone are internally provided with partition walls and guide walls, thereby forming circulation in each zone.