Miscellaneous salt management based on saline-microbial interaction mechanisms: Technology salt reduction strategies

Fluctuations in salinity have a significant impact on the ability of microorganisms to degrade target pollutants during water treatment. However, the interactions between salinity and microorganisms in industrial wastewater treatment have been explored in only a limited number of studies. Therefore, taking the actual coking wastewater treatment project as an example, the internal relationship between salinity, microbial community and pollutant removal was explored, and the technology salt reduction strategy was put forward. It was found that pollutants in wastewater treatment showed co-removal phenomenon and changes in salinity firstly elicited the response of denitrifying and phosphorus-removing carbon-utilizing microbial populations of Ottowia / Diaphorobacter , Alicycliphilus / Pseudomonas and Nitrosomonas / Nitrospira . The increase of salinity will lead to the destabilization of the microbial system, and the migration rate indicates that the aerobic unit ( R 2  = 0.8214) is more adaptable to the salt stress brought by the foreign environment than the anaerobic/anoxic unit ( R 2  = 0.2129). Meanwhile, the Beta Nearest Taxon Index indicates that the OHO (oxic - hydrolytic & heterotrophic denitrification - oxic) process, characterized by the stochastic assembly of microbial communities during salinity increases, exhibits a greater capacity to withstand the potential impacts of water quality fluctuations and uncertainties. The effects of salinity increase on nitrogen removal path were as follows: nitrification ( p  = −1.9204) > DNR ( p  = −1.668) > denitrification ( p  = −0.1226) > anaerobic ammoxidation ( p  = −0.0448), based on which the concept of technology salt reduction was proposed. Technology salt reduction was realized in A-OHO process, which provided a scientific basis for the salt reduction function of microorganisms in water treatment technology.