The rusty scrap iron (RSI) or a mixture of rusty scrap iron and reduced iron powder (RSI-RIP) can be used as an exogenous additive to enhance the anaerobic fermentation of sewage sludge. In order to make rational use of the fermentation residue, the sludge after intensified fermentation was pyrolyzed to produce biochar in this study, which was used in the adsorption of ammonia and phosphorus from the anaerobic fermentation broth. The experimental results demonstrated that the pore structure of the sludge biochar was greatly improved after enhanced fermentation with RSI and RIP. Meanwhile, there was an increase in the proportion of metallic elements such as Ca, Fe and Mg. On the other hand, the RSI-RIP co-enhanced fermented biochar (ES600) prepared at 600 °C showed a higher adsorption capacity, which was comparable to the commercially activated carbon. Neutral or weakly alkaline environments were preferred during the adsorption process. At a suitable pH condition, the maximum removal efficiency of ammonia nitrogen (NH₄⁺-N) and total phosphorus (TP) on ES600 reached 91.3% and 98.6%, respectively. In addition, the saturated ES600 was regenerated by simple washing with ammonia-free water. After three cycles, the removal efficiency of NH₄⁺-N and TP remained at 71.3% and 83.2%, respectively. As a result, the biochar prepared from RSI-RIP enhanced fermented sludge can be used as a promising low-cost adsorbent.

生锈的废铁（RSI）或生锈的废铁与还原铁粉的混合物（RSI-RIP）可用作外源添加剂，以增强污水污泥的厌氧发酵。为了合理利用发酵残渣，本研究对强化发酵后的污泥进行热解制备生物炭，将其用于厌氧发酵液中氨和磷的吸附。实验结果表明，采用RSI和RIP强化发酵后，污泥生物炭的孔结构得到了很大改善。同时，诸如Ca，Fe和Mg的金属元素的比例增加。另一方面，在600°C下制备的RSI-RIP共增强发酵生物炭（ES600）具有更高的吸附能力，与商业活性炭相当。在吸附过程中，优选中性或弱碱性环境。在合适的pH条件下，氨氮（NHES600上的₄ ⁺ -N）和总磷（TP）分别达到91.3％和98.6％。另外，通过用无氨水简单洗涤来再生饱和的ES600。在三个循环之后，NH ₄ ⁺ -N和TP的去除效率分别保持在71.3％和83.2％。结果，由RSI-RIP增强的发酵污泥制备的生物炭可用作有前途的低成本吸附剂。