Egemen E, Corpening J, Nirmalakhandan N
Civil, Agricultural and Geological Engineering Department, New Mexico State University, Las Cruces 88003, USA.
Water Sci Technol. 2001;44(2-3):445-52.
The ultimate disposal of biosolids has been and continues to be one of the most expensive problems faced by wastewater utilities. Previous work has shown that the waste sludge generation in an activated sludge plant can be reduced by promoting cryptic growth conditions (i.e., biomass growth on intracellular products). For this purpose, excess biosolids from a continuous flow activated sludge system were solubilized using ozone as the cell lysing agent, and then returned to the aeration tank. The results of these preliminary studies indicate that the proposed process configuration has the potential to reduce the waste sludge production by 40% to 60%. In the present research, the details of the ozonation process is further investigated to determine the maximum solubilization efficiency. For this purpose, a number of variables such as the solids concentration in the excess sludge, ozonation time, and ozonation dosage rate are studied.
生物固体的最终处置一直是且仍然是污水处理厂面临的最昂贵问题之一。先前的研究表明，通过促进隐蔽生长条件（即细胞内产物上的生物量生长），活性污泥厂的剩余污泥产量可以降低。为此，使用臭氧作为细胞裂解剂将连续流活性污泥系统中的过量生物固体溶解，然后返回曝气池。这些初步研究的结果表明，所提出的工艺配置有可能将剩余污泥产量降低40%至60%。在本研究中，进一步研究了臭氧化过程的细节，以确定最大溶解效率。为此，研究了多个变量，如剩余污泥中的固体浓度、臭氧化时间和臭氧化剂量率。
