A set of devices for wastewater evaporation have been built and a series of researches on evaporation of distilled ammonia wastewater and pigment production wastewater have been carried out to obtain the characteristics of the evaporation process so as to provide basic data for evaporation system design. The results show that the boiling point elevation of the wastewater increases gradually with the rise of concentration multiple, and that the boiling points of distilled ammonia wastewater and pigment production wastewater from different process stages are slightly different under the same concentration multiple. The COD in the condensate water of pigment production wastewater gradually decreases in the evaporation process. Change rules of TDS and pH in the condensate water of different kinds of wastewater are roughly the same, i.e., to decrease firstly then tend to be constant, mainly being dependent upon the volatile substances and droplet inclusion in the wastewater.

organic wastewater with high salinity and concentration  /  distilled ammonia wastewater  /  pigment production wastewater