生物学处理过程的另一个好处是它无需加热或冷却，而且无有毒化学品。
Another advantage of the biological system is that it requires no heating or cooling, and no toxic chemicals.
化学处理，例如重铬酸钠溶液，可以促进无氧化膜和杂质不锈钢表面的钝化膜更快速度的生成。
Chemical treatments, such as sodium dichromate solutions, may facilitate the more rapid formation of the passive film on a stainless steel surface already free of scale or foreign matter.
化学镀镍层起泡脱皮会导致无镀层部位的加速腐蚀，在表面处理中是不允许出现的。
Bubbling and peeling on chemical nickel coating cause fast erosion of no coating part. The appearance can't emerge in the surface treatment.
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