例如爱俄华州规定，废旧汽车电池中的铅和酸必须回收利用。
Iowa, for example, mandates that the lead and acid from used automobile batteries be recycled.
采用稀酸套洗工艺代替传统的加水稀释洗涤工艺，成功地解决了阳离子交换树脂生产中废酸的回收利用问题。
The waste acid from the manufacture of cation exchange resin can be successfully recovered and reused by a new washing process with dilute acid instead of traditional washing process with water.
介绍该厂铬盐车间利用磷酸法对铬酸渣回收利用的两次技术改造及主要设备的结构，以供同行业厂家参考。
Twice technology reforms and the structure of main equipment for the recovery of chromic acid sludge by phosphoric acid method are described.
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