在化学生物絮凝工艺中对总磷实施自动控制的研究

Study on TP Autocontrol in Chemical Biological Flocculation Process

化学生物絮凝工艺是以去除污水中的COD、SS和TP为目标的一级强化处理工艺。为保证其出水水质稳定,构建了该工艺的自动控制系统。它采用以进水TP浓度为基础的前馈控制和以出水TP浓度为控制参数的反馈控制,来实现对投药量的自动调节。试验结果表明,该自动控制系统对化学生物絮凝工艺的投药量具有很强的调节作用,可使投药量随进、出水TP浓度的变化进行实时调整;当出水TP浓度稳定在1 mg/L以下时,自动控制的投药量比手动操作的节省约25%,从而降低了运行费用。与手动加药相比,该自动控制系统的推广可取得良好的经济效益。

Chemical biological flocculation process, one of the primary enhanced processes, is aimed to remove COD, SS and TP from wastewater mainly. In order to make the effluent quality stable, the autocontrol system of the process was constructed, in which the effluent concentration of TP was chosen as the control objectives, and the influent concentration of TP was considered at the same time. The experimental results indicate that the dosage of the PAFC can be adjusted on real time by the above autocontrol system. When the effluent concentration of TP is sustained at less than 1 mg/L, the flocculant dosage of autocontrol system can be saved by 25 % compared with the manual control system, thus reducing operating cost and having better economic returns.