Hexavalent chromium (Cr6+) has contaminated the Potomac-Raritan-Magothy aquifer system at the Puchack Well Field Superfund Site located in Pennsauken Township, New Jersey. Chromium concentrations up to 5,700 μg/L have been observed in the site wells. The 80 acre plume is located beneath a mixed-use area consisting of private residences, businesses and light industry. In-situ geochemical fixation technology was selected as the remedy to reduce Cr~(6+) to Cr~(3+) to form a stable chromium/iron oxyhydroxide precipitate. A pilot study was performed using two reducing agents (potassium lactate and calcium polysulfide) that were found effective in achieving the treatment goals at the bench scale. The pilot study was performed to assess the bench scale study dosage rates for lactate (1 percent solution) and calcium polysulfide (0.1 percent solution), longevity and retardation of the reductants, removal rate of chromium, geochemical changes in the aquifer, and the effective radius of influence. Two identical test cells were set up side-by-side approx-
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机译：六价铬（CR6 +）污染了Puchack Well Field Superfund网站的Potomac-Raritan-Magothy Aquifer系统，位于新泽西州佩恩斯郡乡镇。在场地井中观察到铬浓度高达5,700μg/ L. 80英亩的羽流位于混合使用区下方，包括私人住宅，企业和轻工业。选择原位地球化学固定技术作为将Cr〜（6+）降低至Cr〜（3+）以形成稳定的铬/铁羟基氧化物沉淀物的补救措施。使用两种还原剂（乳酸钾和钙多硫化物）进行试验研究，该研究被发现有效地实现了替补秤的治疗目标。进行试验研究以评估乳酸乳酸（1％溶液）和钙多硫化物（0.1％溶液），寿命和还原剂的延迟，铬的去除率，含水层的地球化学变化以及有效影响半径。两个相同的测试细胞并排设置 -
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