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Although it was originally believed biotransformation processes could not occur near a chlorinated solvent source zone because of the toxicity of high contaminant concentrations associated with the presence of NAPL (Abelson 1990; Bouwer 1994; Robertson and Alexander 1996), recent chlororespiration investigations have been performed in the presence of non-aqueous-phase PCE (Adamson et al. The National Association for Printing Leadership (NAPL), Paramus, New Jersey, USA, a commercial printing industry trade association, has issued its June "Printing Business Conditions Special Update" with indicators showing that business continued to weaken in June for commercial printers, reducing both confidence and the NAPL Printing Business Index[c] to five-month lows. Originally developed by the petroleum industry for enhanced oil recovery (Lake 1989), this method involves a) injection of co-solvent such as alcohol or surfactant into the source zone area of an NAPL plume; b) partitioning of the contaminant into the co-solvent groundwater phase; and c) its recovery and ex situ separation from the co-solvent-groundwater mixture, which is subsequently recycled into the aquifer for capture of additional contaminant [U. |
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