To test the effect of electrolysis and microbial remediation technology in polluted river sediment, we explored the possibility of using electrolysis method to remove ammoniacal nitrogen–nitrogen (NH₃–N), nitrate-nitrogen (NO₃^––N) and phosphate ions-phosphorous (PO₄³⁻–P). The electrolysis was carried out by double electrolysis reaction system with a pair of a titanium (Ti) mesh cathode, a Ti/Ti dioxide (TiO₂)/Ruthenium (IV) oxide (RuO₂) (RuO₂–IrO₂/Ti) mesh anode, and another pair of magnesium–aluminum (Mg–Al) alloy anode and a titanium mesh cathode placed within the sediment and overlying water. Results showed approximately 151.82 ± 21.69 mg total nitrogen (TN) in sediment was removed, which was five times than the non-electrolytic controls (30.21 ± 13.73 mg). Furthermore, NH₃–N concentration in the sediment was substantially reduced (up to 2.9 times) compared to the non-electrolytic controls. Its efficiency lies in the electrolysis process, which may directly remove NH₃–N through electrochemical oxidation and simultaneously produce oxygen which helps nitrifying bacteria to convert NH₃–N into an NO₃⁻–N by anode; moreover, electrolysis may directly remove NO₃⁻–N in the overlying water through electrochemical reduction while simultaneously producing hydrogen electron donors for hydrogen autotrophic microorganisms, such as Hydrogenophohaga. This genus of hydrogen autotrophic denitrifying bacteria dominated the removal of NO₃⁻–N by a cathode in electrolytic sediment. Electrolysis also reduced the PO₄³⁻–P through electro-coagulation since Mg²⁺ ions also produced a sacrificial Mg–Al alloy anode. This anode was used in conjunction with electro-deposition on a Ti mesh cathode to increase PO₄³⁻-P removal in the overlying water and sediment. This study verifies the benefits of electrolysis-driven bioremediation as a sustainable technology for the bioremediation of N and P polluted river sediment.

为了测试电解和微生物修复技术对污染河流底泥的影响，我们探索了使用电解法去除氨氮-氮（NH ₃ -N）、硝酸盐-氮（NO ₃ ^- -N）和磷酸根离子的可能性-磷（PO ₄ ^3- -P）。电解是通过双电解反应系统与一对钛 (Ti) 网状阴极、Ti/Ti 二氧化钛 (TiO ₂ )/钌 (IV) 氧化物 (RuO ₂ ) (RuO ₂ –IrO ₂ /Ti) 进行的网状阳极，而另一对镁-铝（镁-Al) 合金阳极和放置在沉积物和上覆水中的钛网阴极。结果表明，沉积物中去除了大约 151.82 ± 21.69 毫克的总氮 (TN)，是非电解对照 (30.21 ± 13.73 毫克) 的五倍。此外，与非电解对照相比，沉积物中的NH ₃ -N 浓度显着降低（高达 2.9 倍）。其效率在于电解过程，可以通过电化学氧化直接去除NH ₃ -N，同时产生氧气，帮助硝化细菌通过阳极将NH ₃ -N转化为NO ₃ ^- -N；此外，电解可以直接去除NO ₃ ^--N 通过电化学还原在上覆水中产生，同时为氢自养微生物（例如Hydrogenophohaga）产生氢电子供体。这种氢自养反硝化细菌在电解沉积物中通过阴极去除NO ₃ ^- -N占主导地位。由于 Mg ²⁺离子也产生了牺牲的 Mg - Al 合金阳极，电解还通过电凝聚减少了 PO ₄ ^3- -P 。该阳极与 Ti 网状阴极上的电沉积结合使用以增加 PO ₄ ^3--P 去除上覆水和沉积物。这项研究验证了电解驱动的生物修复作为一种可持续的技术对 N 和 P 污染的河流沉积物进行生物修复的好处。