浓缩过的氢氧化纳通过压滤机过滤。
The concentrated sodium hydroxide is filtered through a pressure filter.
使用过的油需按要做滴定法来确定正确的氢氧化纳使用量。
For used oil, you should do a titration to determine the correct amount of NaOH to use.
回收氢氧化纳的主要目的是在经济方面，因为它大大补偿了化学药剂消耗费用。
The main goal of recovery of sodium hydroxide was the economies due to the high replacement cost of this chemical.
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