College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China.
College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China; The Key Laboratory of Eco-Environment in Three Gorges Reservoir Region, Chongqing University, Chongqing 400045, PR China.
Water Res. 2022 Sep 1;223:118962. doi: 10.1016/j.watres.2022.118962. Epub 2022 Aug 9.
Electrolysis manganese slag produced in industrial manganese production causes massive leachate containing heavy metal Mn and inorganic NH-N, which causes serious hazard to the water body and soil. A cost-effective alternative to address the multiple pollution is urgently needed. This study investigated the synergy of grapefruit peel biochar (BC) and strain AL-6 to remediate Mn and NH-N in sequencing batch bioreactor (SBR) and soil column. The results showed that, in SBR, under the condition of C/N 5, temperature 30°C, BC and strain AL-6 showed fabulous performance to remove Mn (99.3%) and NH-N (97.7%). The coexisting ions Mg and Ca had no effects on the removal of Mn and COD, however, 23.3% removal efficiency of NH-N was curtailed. Characterization found that the presence of MnCO confirmed the adsorption of Mn by functional groups action, and gas chromatography indicated that BC and strain AL-6 promoted the reduction of NO and organic carbon. In addition, BC and strain AL-6 helped to immobilize 799.41 mg L of Mn and 320 mg L of NH-N after 45 d in the soil column. And the determination of TOC, CEC, pH, Eh, soil enzymatic activity (catalase and urease), and microbial diversity and abundance confirmed that BC and strain AL-6 increased the soil fertility and bioavailability of pollutants. Totally, BC and strain AL-6 possess great potential to remediate Mn and NH-N pollution in water and soil.
工业锰生产中产生的电解锰渣会产生大量含有重金属 Mn 和无机 NH-N 的浸出液，这对水体和土壤造成了严重的危害。急需一种经济有效的方法来解决多种污染问题。本研究探讨了柚子皮生物炭（BC）和菌株 AL-6 的协同作用，以修复序批式生物反应器（SBR）和土壤柱中的 Mn 和 NH-N。结果表明，在 SBR 中，在 C/N 为 5、温度为 30°C、BC 和菌株 AL-6 的条件下，对 Mn（99.3%）和 NH-N（97.7%）的去除效果非常好。共存离子 Mg 和 Ca 对 Mn 和 COD 的去除没有影响，但 NH-N 的去除效率降低了 23.3%。表征发现 MnCO 的存在证实了 Mn 是通过官能团作用吸附的，气相色谱表明 BC 和菌株 AL-6 促进了 NO 和有机碳的还原。此外，BC 和菌株 AL-6 在土壤柱中 45 天后有助于固定 799.41 mg·L-1 的 Mn 和 320 mg·L-1 的 NH-N。TOC、CEC、pH、Eh、土壤酶活性（过氧化氢酶和脲酶）以及微生物多样性和丰度的测定证实，BC 和菌株 AL-6 提高了土壤肥力和污染物的生物利用度。总的来说，BC 和菌株 AL-6 具有修复水和土壤中 Mn 和 NH-N 污染的巨大潜力。
