A novel phenol and ammonia recovery process for coal gasification wastewater altering the bacterial community and increasing pollutants removal in anaerobic/anoxic/aerobic system.

Coal gasification wastewater (CGWW) is a typical toxic and refractory industrial wastewater. Here, a novel phenol and ammonia recovery process (IPE) was employed for CGWW pretreatment, and the coupled system assemble by the IPE process with A ² /O system (IPE-A ² /O) were operated to enhance the treatment performance of CGWW. The results showed that the IPE pre-treated effluent had a higher BOD ₅ /COD ratio and lower refractory compounds compared to a typical process (MIBK). Subsequent A ² /O biological treatment indicated that the A ² /O-p system (A ² /O system followed IPE process) obtained a higher average COD removal of 92% compared to 87.7% of the control (A ² /O-m, A ² /O system followed MIBK). The GC-MS analysis suggested that the content of alkanes in the IPE-A ² /O effluent was lower than that of the MIBK-A ² /O. The high-throughput sequencing revealed Levilinea, Alcaligenes, Acinetobacter, Thauera and Thiobacillus were the core genera in A ² /O system. The genera Alcaligenes, Acinetobacter, Thauera and Thiobacillus in the degrading consortium were enriched in the A ² /O-p system, leading to increased removals of organic pollutants and TN. These results suggested that the IPE process was a feasible pretreatment method, and the coupled IPE-A ² /O system was an alternative technique for treating CGWW.
(Copyright © 2019. Published by Elsevier B.V.)