In this study, pyrrhotite is applied to remove arsenite (As(III)) and NO₃⁻ from groundwater simultaneously. Batch experiments find that sulfur autotrophic denitrifiers are not inhibited by As(III) with concentration up to 70 mg·L⁻¹, and pyrrhotite autotrophic denitrification (PAD) can effectively remove As(III), NO₃⁻ and PO₄³⁻ simultaneously. Treating water with As(III) 874.50±32.76 µg·L⁻¹, NO₃⁻-N 30 mg·L⁻¹, and PO₄³⁻-P 0.5 mg·L⁻¹, the pyrrhotite-sulfur-limestone autotrophic denitrification (PSLAD) biofilter can achieve effluent with total Arsenic (As) 7.84±7.29 µg·L⁻¹, NO₃⁻-N 3.78±1.14 mg·L⁻¹, and PO₄³⁻-P below detection limit at hydraulic retention time 6 h. In the PSLAD biofilter, Thiobacillus is the most abundant bacterium, and it uses pyrrhotite and sulfur as electron donor to reduce NO₃⁻, and basically Fe²⁺ and As(III) are oxidized to Fe³⁺ and arsenate, respectively. As and PO₄³⁻ were mainly removed through precipitates FeAsO₄ and FePO₄, respectively. Technology based on the PAD is a simple, cost-effective and efficient way for remediation of As(III) and NO₃⁻ co-contaminated groundwater, and avoiding contaminants transference between groundwater and surface water.

在这项研究中，磁黄铁矿被施加以除去砷（如（III））和NO ₃ ^-同时从地下水。间歇实验发现，硫的自养脱氮菌不被作为（III）与浓度高达抑制至70mg·L ^-1，磁黄铁矿和自养反硝化（PAD）能有效地去除作为（III），NO ₃ ^-和PO ₄ ^3-同时。用As（III）处理水874.50±32.76 µg·L ^-1，NO ₃ ^-- N 30 mg·L ^-1和PO ₄ ^3- P 0.5 mg·L ^-1，黄铁矿-硫-石灰石自养反硝化（PSLAD）生物滤池可实现废水中的总砷（As）7.84±7.29 µg·L ^-1，NO ₃ ^-- N 3.78±1.14 mg·L ^-1和PO ₄ ^3- -P在液压保持时间6 h低于检测极限。在PSLAD生物滤池，硫杆菌是最丰富的细菌，它使用磁黄铁矿和硫作为电子供体，以减少NO ₃ ^- ，和基本上的Fe ²⁺和As（III）被氧化成Fe ³⁺分别和砷酸。主要通过沉淀FeAsO ₄和FePO ₄除去As和PO ₄ ^3-， 分别。基于该PAD技术是作为（III）和NO的补救一种简单，成本有效且高效的方式₃ ^-共-污染的地下水，并避免地下水和地表水之间的污染物转移。