随着下水道收费和燃料成本的增加，1981年开始调查厌氧预处理替代方案。经过广泛评估，确定上流式厌氧污泥床工艺具有最大的成功应用潜力。1982年进行了一项试点研究，以确定负荷、废物特性、去除效率、气体数量和质量以及其他要求。在试点研究成功运行的基础上，设计并建造了一个全尺寸系统，并于1985年3月开始运行。这座工厂经过一些小的改造，至今仍在运行，是本文的重点。

WITH INCREASING SEWER CHARGES AND FUEL COSTS, AN INVESTIGATION WAS INITIATED TO REVIEW AN ANAEROBIC PRETREATMENT ALTERNATIVE IN 1981. AFTER EXTENSIVE EVALUATION, IT WAS DECIDED THAT THE UPFLOW ANAEROBIC SLUDGE BLANKET PROCESS SHOWED THE GREATEST POTENTIAL FOR SUCCESSFUL APPLICATION. A PILOT STUDY WAS CONDUCTED IN 1982 TO DETERMINE THE LOADINGS, WASTE CHARACTERISTICS, REMOVAL EFFICIENCIES, GAS QUANTITY AND QUALITY, AND OTHER REQUIREMENTS. BASED ON THE SUCCESSFUL OPERATION OF THE PILOT STUDY, A FULL SCALE SYSTEM WAS DESIGNED AND BUILT AND BEGAN OPERATION IN MARCH 1985. THIS PLANT, WITH SOME MINOR MODIFICATIONS, IS STILL IN OPERATION TODAY AND IS THE FOCUS OF THIS PAPER.