低有机负荷处理高浓度金属离子废水的研究与应用环境工程专业论文.docxVIP

Good performance was observed when 1.3mL of 2% PAC solution and 1.3mL of 1‰ PAM solution were dosed in the 1000mL of mixed liquid. At this condition, the mass ratio between PAC and PAM was 20:1. If only PAM was used, the settling ability of the activated sludge could also be effectively improved. It could get better result when 2.4mL of 1‰ PAM solution was dosed into 1000ml of mixture. In the full-seale experiment, the operation conditions were further investigated by adding different concentrations and ratios of coagulants. Experiment results showed that the optimal condition was mass ratio of 20:1 between PAC and PAM, and 1.1mg/L of dosing amount for PAM.When only PAM was used, the optimal dosing concentration was 2mg/L. Considering cost of chemicals, it was most effective to dose PAM only. Finally, after the study on the wastewater quality designed, technical parameters, operation mode of the plant, the process was modified accordingly with consideration of the actual situation. The continuous and stable operation of the wastewater treatment process could be achieved through proper control of aeration, strict control of DO, without the internal reflux and the swirling grit. Addition of coagulants, under the conditions, the system was operated stably with low organic loading, high concentration of MLSS, and long sludge age. The effluent could meet the standards. KEY WORDS：low organic loading；high concentrations of metal ions；industrial wastewater i i 目 录 HYPERLINK \l _bookmark0 第一章 HYPERLINK \l _bookmark0 绪论 HYPERLINK \l _bookmark0 1 HYPERLINK \l _bookmark1 1.1 HYPERLINK \l _bookmark1 研究背景 1 HYPERLINK \l _bookmark2 1.2 HYPERLINK \l _bookmark2 各类金属离子对活性污泥微生物影响的机理研究 1 HYPERLINK \l _bookmark3 1.2.1 HYPERLINK \l _bookmark3 金属离子对微生物的影响机理1 HYPERLINK \l _bookmark4 1.2.2 HYPERLINK \l _bookmark4 微生物反应动力学2 HYPERLINK \l _bookmark5 1.3 HYPERLINK \l _bookmark5 各类金属离子对活性污泥法工艺的影响 2 HYPERLINK \l _bookmark6 1.3.1 HYPERLINK \l _bookmark6 影响生物反应动力学2 HYPERLINK \l _b