Study on the Effect of A2O+MBR Process in Treating Low Carbon-Nitrogen Ratio Wastewater
Wastewater treatment plants often face the problem of low carbon-nitrogen ratio in the influent,in order to ensure that the effluent quality meets the standards,a strategy of excessive addition of carbon sources is generally adopted,but this can lead to an increase in operating costs.A wastewater treatment plant in Beijing city adopts the Anaerobic-Anoxic-Oxic(A2O)+Membrane Bio-Reactor(MBR)process as the main process,with the influent consisting of domestic sewage(accounting for 30%)and industrial wastewater(accounting for 70%).The wastewater treatment plant adds glucose solution to the anoxic tank as a carbon source to assist in denitrification.The experiment separately measures the concentration of Chemical Oxygen Demand(COD),Total Nitrogen(TN)in the influent and effluent,and Mixed Liquid Suspended Solids(MLSS)in the reaction tank,analyzes the effect of additional carbon source on denitrification efficiency and sludge production,and compares the cost before and after carbon source addition.Research has shown that when the influent COD/TN is less than 7,adding an appropriate amount of carbon source can help improve denitrification efficiency,however,when the COD/TN is greater than 7,other processes need to be optimized to enhance denitrification efficiency and ensure that the effluent quality stably meets relevant standards.By refining process control and changing operational management methods,wastewater treatment plants can effectively reduce operating costs and avoid engineering transformations.
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