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Lead Contamination Of Potable Water Due To Nitrification

机译：硝化作用导致饮用水中的铅污染

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Nitrification can increase levels of soluble lead in potable water by reducing pH. The magnitude of the pH drop depends on the initial alkalinity and extent of nitrification. At 100 mg/L alkalinity as CaCO_3, complete nitrification did not significantly decrease pH (pH stayed >7.5) or increase lead contamination of water for lead pipe, but at 15 mg/L alkalinity, nitrification decreased the pH by 1.5 units (pH reduced to <6.5) and increased soluble lead contamination by 65 times. Lower pH values from nitrification also leached 45% more lead and 81% more zinc from leaded brass connected to PVC pipes relative to the same situation for copper pipes. Paniculate lead leaching was high but did not vary dependent on nitrification. While nitrification also produces nitrite and nitrate and reduces inorganic carbon and dissolved oxygen, these factors did not significantly impact lead leaching in this work.
机译：硝化可通过降低pH值来增加饮用水中可溶性铅的含量。 pH下降的幅度取决于初始碱度和硝化程度。在碱度为100 mg / L的CaCO_3时，完全硝化不会显着降低pH（pH保持> 7.5）或增加铅管中水的铅污染，但是在碱度为15 mg / L时，硝化作用会使pH降低1.5个单位（pH降低）。至<6.5），可溶性铅污染增加了65倍。与铜管的相同情况相比，硝化产生的较低的pH值还使与PVC管连接的含铅黄铜的铅浸出量增加了45％，锌浸出量增加了81％。铅的浸出率很高，但不会因硝化作用而变化。尽管硝化作用还会产生亚硝酸盐和硝酸盐并减少无机碳和溶解氧，但这些因素并未显着影响这项工作中的铅浸出。

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