关键词: 废物处理, 优化设计, 显微结构, 机械转盘, 超声, 响应面法

Abstract:

The new-type mechanical rotary disk(MRD), which was used for the experiment of excess sludge disintegration combination with ultrasound, was manufactured by independent design to improve the disintegration effect. To investigate the MRD disintegration effect, the experiments under different operation conditions were carried out. The results showed that d(the distance between the plates) and T_m(the disintegration time) were the important factors to influence SCOD₊(the added value of solubility chemical oxygen demand) and EDR(energy disintegration ratio). The SCOD₊ was 3130 mg·L^-1 after 25 min of MRD disintegration under the condition that d was 1.5 mm and the revolving speed was 2300 r·min^-1, which presented that the disintegration was effective. According to the center combination experimental design of Central-Composite based on the response surface method, SCOD₊ and EDR were considered as response to paid attention to the energy efficiency. SCOD₊ and EDR were 7871.78 mg·L^-1 and 8.475 mg·L^-1·kJ^-1 under the optimal conditions that d, T_m and T_u(ultrasound disintegration time) were 2.76 mm, 10.89 min and 17.2 min, respectively. The results were respectively 3.02 times and 2.7 times of What used MRD（2610 mg·L^-1，3.11 mg·L^-1·kJ^-1）and 2.48 times and 2.6 times of that used ultrasonic（3170 mg·L^-1，3.26 mg·L^-1·kJ^-1）under the same total disintegration time.

Key words: waste treatment, optimal design, microstructure, mechanical rotary disk, ultrasonic, response surface method