Analysis of the microbial community structure in sludge from diamond wire-cutting wastewater treatment using biologically enhanced SBR

ABSTRACT In the photovoltaic industry, the main pollutant components in diamond wire-cutting wastewater are polyols. These polyols are characterized by long molecular chains, high chemical oxygen demand, and low biodegradability. When treating this wastewater with advanced oxidation processes, issues such as high reagent consumption, high treatment costs, and large-scale sludge production can arise. This article focuses on photovoltaic diamond wire-cutting wastewater as the research subject. By isolating and screening bacterial species from long-term domesticated activated sludge and then adding them to a sequencing batch reactor through the biological enhancement method, the study aims to explore the COD removal effect of the wastewater. Structurally, the biodiversity of the sludge microbial community is analyzed. The research reveals that the biodiversity of the enhanced sludge has declined. About 94.5% of bacterial species are concentrated in four major phyla, with the main genera being Sphingobium, Rhodococcus, Serictochromia, Hydrogenophaga, Stenotrophomonas, Shinella, and Brevundimonas. The addition of enhanced bacteria changed the biodiversity and species composition of sludge, effectively improving the COD degradation efficiency of diamond wire-cutting wastewater.