Patent ID: 11905192
Assignee: NANJING UNIVERSITY
Field: Environmental technology (Chemistry)
Classification: CPC C  Y | IPC C

Claim 7:
8. A method, comprising:
S1: establishing a model 1 and a model 2 for simultaneous simulation of microbial dissolved organic nitrogen (mDON) and inorganic nitrogen (DIN) in denitrification processes; and
S2: selecting the model 1 or the model 2 according to a set carbon/nitrogen ratio to collaboratively optimize concentration values of mDON and DIN in an effluent of a denitrification process, to obtain best process operation parameter values;, wherein:
in S1, operations for establishing the models 1 and 2 comprise:
S1-1: data collection: measuring chemical oxygen demand (COD), total nitrogen (TN), inorganic nitrogen (iDIN), dissolved organic nitrogen (rDON) and pH in an influent of a target sewage plant in the denitrification process, inorganic nitrogen (eDIN) and dissolved organic nitrogen (eDON) in the effluent, dissolved oxygen (DO), a hydraulic retention time (t) of a denitrification stage, and a mixed liquor suspended solid (MLSS) of activated sludge;
S1-2: model construction: according to a kinetic process of production, transformation and consumption of mDON during a complete denitrification process, adding mDON as a new component and a carbon/nitrogen ratio as a new parameter into an activated sludge model (ASM), and constructing the models 1 and 2 at different carbon/nitrogen ratios by using mDON and DIN as objects;
S1-3: model initialization: initializing the models 1 and 2 based on data collected in S1-1, calculated values of model parameters and the models 1 and 2 constructed in S1-2;
S1-4: model calibration: calibrating a parameter estimation function based on simulated mDON and DIN kinetics and a result of sensitivity analysis; and
S1-5: model establishment: replacing initial parameter values in the models 1 and 2 with parameter calibration values to obtain calibrated models 1 and 2; and

the sensitivity analysis uses an absolute-relative sensitivity equation to calculate the influences of parameter changes on mDON and DIN.