A collaborative effect of algae-bacteria symbiotic and biological activated carbon system on black odorous water pretreated by UV photolysis

In this study, UV photolysis was deemed as the pretreatment, degrading initially the black odorous water, and the algae-bacteria symbiotic system combined with biologically activated carbon (BAC) column technology was employed to degrade black odorous water. The addition of sodium acetate promoted the proliferation of microalgae and bacteria, enhancing the degradation effect of microorganisms. In the process of adsorption and biodegradation, BAC had a large specific surface area and pore structure, which was good for adsorbing macromolecular dissolved organic matter (DOM) and providing a nutrient environment for microorganisms. Mutant strain Ml could survive in the black odorous water after pretreatment, which was proved to have great application potential. In order to evaluate the optimal removal efficiency, an indoor-scale column study was performed using black odorous river sediment, activated carbon and algae-bacteria mixed solution. The results show that the combined treatment achieved a COD removal of 83 +/- 1 %. The treated water could be used for green land irrigation and ecological water supplement. That played a major role in restoring the self-purification function of the ecosystem and improving the hypoxic environment of water bodies.