Study of control strategy and simulation in anoxic-oxic nitrogen removal process

作     者：PENGYong-zhen WANGZhi-hui WANGShu-ying 

作者机构：KeyLabofBeijingforWaterQualityScienceandWaterEnvironmentalRecoveryEngineeringBeijingUniversityofTechnologyBeijing100022China EngineeringCenterofChineseResearchAcademyofEnvironmentalSciencesBeijing100012China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2005年第17卷第3期

页      面：425-428页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：Foundation item:Beijing Science and Technology Commission(No. H020620010120)  the Significant International Projects of the National Natural Science Foundation of China(No. 50521140075)  Beijing Municipal Education Commission(No. KZ200310005003) and Beijing Key Laboratories 

主　　题：ASM No.1 biological nitrogen removal external carbon addition feed-forward PI control 

摘      要：The control strategy and simulation of external carbon addition were specially studied in an anoxic-oxic(A/O) process with low carbon: nitrogen(C/N) domestic wastewater. The control strategy aimed to adjust the flow rate of external carbon dosage to the anoxic zone, thus the concentration of nitrate plus nitrite(NOx--N) in the anoxic zone was kept closed to the set point. The relationship was studied between the NOx--N concentration in the anoxic zone(S_ NO) and the dosage of external carbon, and the results showed that the removal efficiency of the total nitrogen(TN) could not be largely improved by double dosage of carbon source when S_ NO reached about 2 mg/L. Through keeping S_ NO at the level of about 2 mg/L, the demand of effluent quality could be met and the carbon dosage could be optimized. Based on the Activated Sludge Model No.1(ASM No.1), a simplified mathematical model of external carbon dosage was developed. Simulation results showed that PI controller and feed-forward PI controller both had good dynamic response and steady precision. And feed-forward PI controller had better control effects due to its consideration of influent disturbances.