Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China.
Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China.
Bioresour Technol. 2018 Jan;247:477-485. doi: 10.1016/j.biortech.2017.09.078. Epub 2017 Sep 20.
This study presents a novel strategy for remedying acidification and improving the removal efficiency of pollutants from digested effluent by using Zero-Valent Iron (iron scraps) in a sequencing batch reactor. Through this strategy, the pH increased from 5.7 (mixed liquid in the reactor without added ZVI) to 7.8 (reactors with added ZVI) because of Fe oxidation and NO reduction. The removal efficiencies of COD increased from 11.5% to 77.5% because of oxidation of ferric ion and OH produced in chemical reactions of ZVI with oxygen and because of flocculation of iron ions. The removal efficiencies of total nitrogen rose from 1.83% to 93.3% probably because of autotrophic denitrification using electron donors produced by the corrosion of iron, as well as the favorable conditions for anammox due to iron ions. Total phosphorus increased from -25.8% to 77.1% because of the increase in pH and the precipitation with iron ions.
本研究提出了一种通过序批式反应器中使用零价铁（铁屑）来修复酸化并提高消化液中污染物去除效率的新策略。由于 Fe 的氧化和 NO 的还原，该策略使 pH 值从 5.7（未添加 ZVI 的反应器混合液）增加到 7.8（添加 ZVI 的反应器）。由于铁离子的氧化和 ZVI 与氧反应产生的 OH，COD 的去除效率从 11.5%增加到 77.5%，并且由于铁离子的絮凝作用，总氮的去除效率从 1.83%增加到 93.3%。可能是由于铁腐蚀产生的电子供体的自养反硝化，以及由于铁离子的存在而有利于 anammox 的条件。总磷从 -25.8%增加到 77.1%，是由于 pH 值的升高和铁离子的沉淀。
