ASM-mDON-DIN Model for Collaborative Nitrogen Control
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Solution Overview
Problem
Current wastewater treatment methods fail to simultaneously control and optimize both organic and inorganic nitrogen in the effluent from sewage plants, leading to difficulties in meeting high standards for total nitrogen discharge, which affects water quality and eutrophication control.
Innovation Solution
A mathematical model, ASM-mDON-DIN, is developed to simulate and collaboratively control microbial dissolved organic nitrogen (mDON) and inorganic nitrogen (DIN) in denitrification processes, using data collection, model construction, initialization, calibration, and optimization techniques to determine optimal carbon/nitrogen ratios and operational parameters for effective nitrogen removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If post denitrification process is adopted to improve denitrification efficiency, then total nitrogen removal efficiency is improved, but the ability to simultaneously control both inorganic nitrogen and organic nitrogen is insufficient
Solution Approach 1:
The patent combines the control of inorganic nitrogen (DIN) and organic nitrogen (DON) into a single integrated mathematical model (ASM-mDON-DIN model). This unified model merges previously separate treatment approaches, allowing simultaneous simulation and collaborative optimization of both nitrogen forms through unified process parameter adjustment, thereby resolving the insufficiency in simultaneous control capability.
Solution Approach 2:
The ASM-mDON-DIN model serves multiple functions: it simulates both DIN and DON transformations, predicts effluent nitrogen concentrations, and optimizes process parameters for total nitrogen removal. This multi-functional model replaces the need for separate control strategies, enabling the system to handle diverse nitrogen control requirements through a single versatile tool.
2Measurement precision
If traditional activated sludge nitrogen model is used, then inorganic nitrogen transformation can be simulated, but microbial dissolved organic nitrogen produced by microbial metabolism cannot be considered
Solution Approach 1:
The patent embeds the DON simulation capability within the existing activated sludge model framework. The ASM-mDON-DIN model nests the microbial dissolved organic nitrogen transformation processes inside the traditional inorganic nitrogen simulation structure, allowing both DIN and DON to be simulated simultaneously within a hierarchical model architecture, thus preserving all nitrogen forms without information loss.
Solution Approach 2:
The model integrates multiple nitrogen forms (inorganic nitrogen and organic nitrogen) into a composite simulation system. By combining DIN transformation kinetics with DON production and degradation processes, the model creates a composite representation of total nitrogen dynamics, capturing both inorganic and organic nitrogen behaviors that neither model could achieve alone.
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 ASM-mDON-DIN models achieve high accuracy in simulating and controlling mDON and DIN concentrations, ensuring compliance with stringent total nitrogen discharge standards and improving the efficiency of wastewater treatment processes.
Implementation Method 1
the activated sludge nitrogen model issued in 2008 by the IWA described the transformation and removal of DIN components (ammonia nitrogen, nitrate nitrogen and nitrite nitrogen) during the complete denitrification process of the activated sludge
Implementation Method 2
did not consider microbial dissolved organic nitrogen (mDON) produced by microbial metabolism in the denitrification effluent
Data Source
AI summary
A method for collaborative optimization control method for organic nitrogen and inorganic nitrogen in a denitrification process is provided. The method includes: establishing ASM-mDON-DIN models for simultaneous simulation of microbial dissolved organic nitrogen (mDON) and inorganic nitrogen (DIN) in denitrification processes; and selecting a corresponding ASM-mDON-DIN model according to a set carbon/nitrogen ratio to collaboratively optimize the concentration values of mDON and DIN in the effluent in the denitrification process, to obtain best process operation parameter values.