固相反硝化微生物系统处理低碳污水动力学性能及经验模型研究

The kinetic characteristics and empirical model of solid-phase denitrification microbial system for low carbon wastewater treatment

经验模型是指导固相反硝化工艺实际应用的重要理论基础,但其相关理论体系尚不够完善。为此,研究了基于聚丁二酸丁二醇酯(polybutylene succinate,PBS)固相反硝化(solid-phase denitrificatio,SPD)工艺的动力学脱氮性能及经验模型,并对模型进行了验证。结果表明:SPD工艺的氨氧化速率为1.05 g NH_(4)^(+)-N/g VSS/h,反硝化速率为1.98 g NH_(4)^(+)-N/g VSS/h。固体碳源释放峰值期后的释放律符合对数方程y=-72.15 ln(x)+273.02,但是在启动初期具有出水有机物超标的风险。该工艺单级经验模型为S_(1)=S 0 exp(-0.08 t),多级经验模型表达式为QS_(k-1-)[S_(0)exp(-0.08t)-S_(0)]/tA k=QS_(k)。该模型最大误差为13.80%,模型在长时间预测方面需要进行改进,但是对于固相反硝化工艺的应用具有指导意义。

The empirical model is an important theoretical basis for the practical application of solid-phase denitrification(SPD)process,but the theoretical system needs to be further improved.The kinetic characteristics and empirical model of SPD process based on polybutylene succinate(PBS)were studied and verified.The results show that the nitrification rate of the SPD process is 1.05 g NH_(4)^(+)-N/g VSS/h,and the denitrification rate is 1.98 g NH_(4)^(+)-N/g VSS/h.The carbon source release characteristics after the peak period of carbon source release in SPD system conformed to the logarithmic equation:y=-72.15ln(x)+273.02,but there is a risk of excessive organic concentration in the effluent at the beginning of the start-up period.The single-stage empirical model of the SPD process is S_(1)=S_(0)exp(-0.08 t),and the multi-stage empirical model is expressed as QS k^(-1)-[S_(0)exp(-0.08 t)-S_(0)]/tA k=QS k.The maximum error of this model is 13.80%.The accuracy of the model needs to be improved in terms of long-term prediction,but it provides a theoretical basis for the practical application of SPD process.