Pickling Neutralization

Spent pickling acids, rinse water and scrubber water are neutralized to a pH of 7 to 9 with lime, sodium carbonate, sodium hydroxide, occasionally ammonia (outside U.S.) or other alkaline materials. The treatment depends on local regulations. Most local authorities do not allow solids to be discharged into sewers, and the filtered sludge has to be deposited according to government regulations.