Abstract
Coal gasification brine (CGB) is a typical hypersaline organic wastewater and its proper treatment is a challenging task. In the study membrane distillation (MD) experiments were conducted with raw and pretreated CGB as the feeds. The flux evolutions and permeate quality in different processes were compared to study the interaction between organic and inorganic foulants and investigate the mixed fouling mechanism of membrane. In the MD process concentrating CGB, interaction between NaCl and HA-like materials resulted in the formation of a loose organic layer with small crystals wrapped and inlaid. The fouling layer caused insignificant flux decrease but induced membrane wetting, which finally brought drastic flux decrease. After the CGB was pretreated by extraction and Fenton oxidation processes, membrane fouling and wetting were effectively mitigated and the permeate of MD remained high quality. The HA-like substances were effectively removed and the hydrophilic low-molecular-weight organic compounds became the main organic component, promoting the formation of inorganic fouling layer composed of large CaSO4 crystals. The layer caused insignificant flux decline and could be easily removed by membrane rinse. The study suggests it is feasible to concentrate CGB to a high solid level with the combination of extraction, Fenton oxidation, and DCMD.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
