Nitrate and microbial contamination of groundwater can occur in countries that face intense urbanization and inadequate sanitation. When groundwater is the main drinking water source, as is often the case in such countries, the need to remove these contaminants becomes acute. The combination of two technologies is proposed here, a biological step to denitrify and an electrochemical step to disinfect the groundwater, thereby aiming to reduce the chemical input and the footprint of groundwater treatment. As such, a pyrite-based fluidized bed reactor (P-FBR) was constructed to autotrophically denitrify polluted groundwater. The P-FBR effluent was disinfected in an electrochemical cell with electrogenerated Cl₂. Nitrate was removed with 79% efficiency from an initial 178 mg NO₃⁻ L⁻¹ at an average denitrification rate of 171 mg NO₃⁻ L⁻¹ d⁻¹, with 18 h hydraulic retention time (HRT). The electrochemical unit achieved a 3.8-log reduction in total coliforms with a 41.7 A h m⁻³ charge density.

地下水的硝酸盐和微生物污染可能发生在面临高度城市化和卫生设施不足的国家。当地下水成为主要饮用水源时（这些国家经常出现这种情况），去除这些污染物的需求就变得迫切。这里提出了两种技术的结合，即生物反硝化步骤和电化学步骤对地下水消毒，从而减少地下水处理的化学输入和足迹。因此，建造了基于黄铁矿的流化床反应器（P-FBR）来自养反硝化受污染的地下水。P-FBR 流出物在电化学电池中用电产生的 Cl ₂进行消毒。_{从初始 178 mg NO 3}中去除硝酸盐的效率为 79% ^-L ^-1平均反硝化率为171 mg NO ₃ ^- L ^-1 d ^-1，水力停留时间（HRT）为18小时。该电化学装置的总大肠菌群减少了 3.8 个对数，电荷密度为 41.7 A hm ^{-3 。}