In order to develop constructed wetland (CW) with high-rate N and P removal, sulfur and pyrrhotite modified foam concrete (SPFC) was prepared and used as a substrate to construct CW (SPFC-CW). At hydraulic retention time 6 h, SPFC-CW achieved effluent total nitrogen (TN) 9.96 mg/L and PO-P 0.11 mg/L as influent TN and PO-P were 24.52 and 1.04 mg/L, respectively. TN and PO-P removal rates of SPFC-CW were 21.8 and 1.4 g/md, respectively. Many precipitates with high content of Ca and P attached on SPFC. Sulfurimonas was the most dominant bacterium, and its relative abundances at upper, middle and bottom of SPFC-CW were 53.8 %, 68.4 % and 87.3 %, respectively. SPFC could slowly release S and SO, which had higher autotrophic denitrification rate than pyrrhotite and sulfur, and more Ca than foam concrete. In SPFC-CW sulfur autotrophic denitrification and Ca-P precipitation were the major N and P removal processes, respectively.
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