Hydrolysis acidification-biological contact oxidation process is applied to treat textile-dyeing wastewater, This process is proved to be one of the new water treatment processes.

The sponge iron making with iron sludge produced during DSD acid-making can be used for not only general metallurgy but also iron-carbon bed to treat DSD acid oxidation wastewater.

Aiming at the complexity and poor biochemical degradability of petrochemical wastewater, the effect of tourmaline on bio-contact oxidation method was investigated.