百乐卡工艺是一种具有除磷脱氮功能的多级活性污泥污水处理系统。它是由最初采用天然土池作反应池而发展起来的污水处理系统。自1972年以来，经多年研究形成了采用土池结构、利用浮在水面的移动式曝气链、底部挂有微孔曝气头的一种具有一定特色的活性污泥处理系统。 由于采用土池而大大减少了建设投资，采用曝气链曝气系统进一步强化了氧的砖移效率，并减少运行费用，大大提高了处理效果。工艺设计简捷，不需复杂的管理，在适宜的条件下具有较大的经济和社会效益.

　　As the world's population has increased, sources of clean water have decreased, shifting the focus toward pollution reduction and control. Disposal of wastes and wastewater without treatment is no longer an option. Fundamentals of Wastewater Treatment and Engineering introduces readers to the essential concepts of wastewater treatment, as well as the engineering design of unit processes for the sustainable treatment of municipal wastewater.Readers will get a strong grounding in the principles and learn how to design the unit processes used in municipal wastewater treatment operations. Professionals in the wastewater industry will also find this a handy reference.