2003年7月初，卡罗洛的工程师们在卡斯泰克湖水进行了为期六个月的试点研究 机构（加利福尼亚州圣克拉丽塔）。该项目的最终目标是证明 固定床生物处理用于从Saugus含水层水中去除高氯酸盐（即 持续去除高氯酸盐，使其低于方法检测限（4 mg/L）。具体的 该项目的目标是: 验证是否可以在中试规模内开发足够的高氯酸盐还原生物活性 使用索格斯含水层固有微生物的反应堆； 制定空床接触时间（EBCT）、反洗的全面设计标准 程序、电子供体（乙酸）添加和营养添加；评估固定床生物工艺对系统故障的鲁棒性， 例如电子供体进料故障、工艺关闭和给水氧化剂峰值 浓度；和 确定固定床和流化床高氯酸盐去除的后处理要求 工艺（即，表征工艺废水质量）。结果表明，高氯酸盐还原固定床生物反应器可以进行驯化 利用索格斯含水层的原生生物，高氯酸盐可以被清除到地下 使用合理的接触时间进行检测，并确保这些工艺产生的废水具有相当高的安全性 高质量。最终，该项目的结果将用于评估可行性和可行性 使用固定和固定两种方法处理富含高氯酸盐的索格斯含水层水的相关成本 流化床生物反应器。

In early July 2003, Carollo Engineers initiated a six-month pilot study at the Castaic Lake Water Agency (Santa Clarita, California). The ultimate goal of this project was to demonstrate the efficacy of fixed-bed biological treatment for perchlorate removal from Saugus aquifer water (i.e., show consistent removal of perchlorate to below the method detection limit of 4 mg/L). Specific objectives of the project were to: verify that sufficient perchlorate-reducing biological activity can be developed in the pilot-scale reactors using microorganisms indigenous to the Saugus aquifer; develop full-scale design criteria for empty-bed contact time (EBCT), backwashing procedures, electron donor (acetic acid) addition, and nutrient addition; evaluate the robustness of the fixed-bed biological process with respect to system upsets, such as electron donor feed failure, process shut-downs, and spikes in the feedwater oxidant concentrations; and, determine post-treatment requirements for the fixed- and fluidized-bed perchlorate removal processes (i.e., characterize process effluent quality). Results demonstrated that a perchlorate-reducing, fixed-bed biological reactor can be acclimated using organisms indigenous to the Saugus aquifer, that perchlorate can be removed to below detection using reasonable contact times, and that effluent water from these processes is of fairly high quality. Ultimately, the results of this project will be used to evaluate the feasibility and costs associated with treating perchlorate-laden Saugus aquifer water using both fixed- and fluidized-bed biological reactors.