Effect of iron powder on hydrogen sulfide reduction and phosphate removal in semi‐continuous anaerobic digestion treating primary sludge

Seung‐Jun Oh, Seung‐Han Ha, Eui Jeong Noh, Seung Gu Shin, Johng‐Hwa Ahn
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Abstract

To our best knowledge, no experimental study has previously investigated the simultaneous effects of adding Fe powder for the decrease of hydrogen sulfide (H2S) in biogas and the removal of phosphate (PO4‐P) in continuous anaerobic digestion (AD). This study investigated the effects of iron (Fe) powder (5 g L−1) in AD to remove H2S and PO4‐P. A comparative experiment was conducted using two semi‐continuous‐flow anaerobic digesters treating primary sludge at decreasing hydraulic retention times (HRTs) of 20 to 10 days.The addition of Fe powder to AD removed > 98% of H2S at all HRTs, and removed 64–72% of PO4‐P, with the highest removal efficiency at HRT = 10 d. The addition of Fe powder to AD had no noticeable effect on biogas production or pH, but it increased the CH4 content (62.7–66.0% in Fe‐treated vs 58.2–60.4% in the Control) partly due to the greater presence of Methanoregulaceae. The relative abundance of the microbial groups was more affected by HRT than by the addition of Fe powder. The presence of Fe powder notably increased the abundance of Spirochaetaceae and Syntrophaceae.As shown, the addition of Fe powder can improve the management of both H2S in the biogas and PO4‐P in the digested sludge in the AD system. © 2024 Society of Chemical Industry (SCI).
铁粉对处理初级污泥的半连续厌氧消化中硫化氢还原和磷酸盐去除的影响
据我们所知,此前还没有实验研究调查过在连续厌氧消化(AD)中添加铁粉对降低沼气中硫化氢(H2S)和去除磷酸盐(PO4-P)的同时效果。本研究调查了铁粉(5 g L-1)在厌氧消化(AD)中去除 H2S 和 PO4-P 的效果。在所有的水力停留时间(HRT)下,在厌氧消化(AD)中添加铁粉对 H2S 的去除率均大于 98%,对 PO4-P 的去除率为 64-72%,其中 HRT = 10 d 时的去除率最高。在厌氧消化(AD)中添加铁粉对沼气产量或 pH 值没有明显影响,但增加了 CH4 含量(铁粉处理组为 62.7-66.0%,对照组为 58.2-60.4%),部分原因是增加了甲烷菌科(Methanoregulaceae)的存在。与添加铁粉相比,HRT 对微生物群的相对丰度影响更大。如图所示,添加铁粉可改善厌氧消化(AD)系统中沼气中 H2S 和消化污泥中 PO4-P 的管理。© 2024 化学工业学会(SCI)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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