Malleable iron pipe fittings Wastewater Treatment
The rack or barrel plating process after plating washing water, intermittent countercurrent rinsing method may also be a round robin process emissions, waste water is about pH was adjusted to 9, zinc and iron to form insoluble hydroxide precipitate removed. For dull white liquid of malleable iron pipe fittings, CrO, only 0.5g / g passivation wash water recycling done without emissions, first in cold water and then hot water (6O ℃ a 70 ℃) That after passivation wash, due to the higher temperature , greater evaporation, add more. Supplementary cycle will be done the washing water is not discharged.
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