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Evaluating the Effects of Aged Fe-Enhanced Primary Sedimentation Sludge on Methane Production from Aluminum-Waste Activated Sludge during Anaerobic Digestion
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2022-05-04 , DOI: 10.1021/acsestengg.2c00019
Yi Cheng 1, 2 , Ayaz Thebo 1 , Yun Chen 1 , Nan Shen 1 , Guoxiang Wang 1, 2 , Xiangchun Xue 3
Affiliation  

The iron-containing chemically enhanced primary sedimentation (Fe-CEPS) sludge, as an alternative low-cost iron source, can be used to promote methane production of aluminum-waste activated sludge (Al-WAS) during anaerobic digestion (AD). Generally, the aging time would induce changes in iron species and compounds in the Fe-CEPS sludge and subsequently affect the methane production process. Here, the effects of Fe-CEPS sludge aging on methane production of Al-WAS were investigated. After a 10-day aging treatment, the iron compounds showed a high crystallinity, and the structure of the CEPS sludge became compacted. The aging treatments always increased the methane yield, with the maximum value (143.3 mL/g VS) occurring after 3 days of aging. Following an addition of short-term (0–3 days) aged Fe-CEPS sludge, the physical structure of Al-WAS obviously collapsed during AD. Meanwhile, the surface of the digested sludge became hydrophobic, which benefited the contact between enzymes and sludge flocs, thereby enhancing the biodegradability of the sludge. The results suggest that the addition of short-term aged Fe-CEPS sludge is an effective approach for Al-WAS digestion, which reflects a “treat the wastes with wastes” concept.

中文翻译:

评价陈化铁强化初沉污泥对废铝活性污泥厌氧消化过程中产甲烷的影响

含铁化学强化初沉 (Fe-CEPS) 污泥作为替代的低成本铁源,可用于促进废铝活性污泥 (Al-WAS) 在厌氧消化 (AD) 过程中产生甲烷。一般来说,老化时间会导致 Fe-CEPS 污泥中铁的种类和化合物发生变化,进而影响甲烷的产生过程。在这里,研究了 Fe-CEPS 污泥老化对 Al-WAS 产生甲烷的影响。经过 10 天的陈化处理后,铁化合物的结晶度很高,CEPS 污泥的结构变得紧凑。老化处理总是增加甲烷产量,最大值(143.3 mL/g VS)发生在老化 3 天后。添加短期(0-3 天)老化的 Fe-CEPS 污泥后,Al-WAS 的物理结构在 AD 期间明显崩溃。同时,消化后的污泥表面疏水,有利于酶与污泥絮体的接触,从而提高了污泥的生物降解性。结果表明,添加短期陈化的Fe-CEPS污泥是Al-WAS消化的有效途径,体现了“以废治废”的理念。
更新日期:2022-05-04
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