摘要：

Microbially enhanced permeable reactive barriers (PRBs) are a technology for the remediation of NO3--N-contaminated groundwater. The removal of NO3--N from nitrate-contaminated groundwater using a sulfur-based biodenitrification reactor was studied. The average values of the NO3--N removal efficiency using SSS (sand : cement : S-0 : scallop shell = 1 : 1 : 1.5 : 2) and SWC (sand : cement : S-0 : wood chips = 1 : 1 : 1.5 : 0.5) reactors were 97.75% and 90.06%, respectively. In addition, the maximum value of the NO3--N removal efficiency using the SSS reactor reached 100% with a low NO2--N accumulation rate, and the scallop shell was essential to stabilize the pH value of the reactor and reduce the production of SO42-. In the SSS and SWC reactors, Sulfurimonas and Thiobacillus played major roles in the denitrification process, together constituting 72.29% and 84.69%, respectively. With the analysis of organic elements in the composite filler and scanning electron microscopy (SEM), we also found that S-0 played an important role in the reactor. Therefore, our research could provide some technical insights into the treatment of nitrate-contaminated groundwater.

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