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首页> 外文期刊>Environmental engineering and management journal >ENHANCED ANAEROBIC DIGESTION PERFORMANCES: EFFECT OF SLUDGE ULTRASOUND PRE-TREATMENT AND ROLE OF THE MICROBIAL POPULATION
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ENHANCED ANAEROBIC DIGESTION PERFORMANCES: EFFECT OF SLUDGE ULTRASOUND PRE-TREATMENT AND ROLE OF THE MICROBIAL POPULATION

机译：增强的厌氧消化性能：污泥超音速预处理和微生物种群的作用

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Ultrasounds pretreatment aims to convert waste activated sludge, characterized by recalcitrant particulate organics, into a soluble, more biodegradable form, maximizing anaerobic stabilization and biogas recovery. Objective of this work was the assessment of the efficiency of high frequency ultrasounds, as 200 kHz, to improve sludge anaerobic digestion performances. Parallel batch anaerobic digestion tests were performed to evaluate anaerobic biodegradability of 20 or 200 kHz sonicated secondary sludge, operating at food/inoculum ratio of 0.5 and 1. Ultrasound pretreatments, independent on the frequency, accelerated the initial hydrolysis phase, and the effect was more marked working at high inoculum content. Moreover, the biogas produced by the sonicated sludge was always higher than that produced by the untreated one. This gain seemed to be independent on the F/I ratio for the digestion of the 20 kHz pretreated sludge, while, in the case of sludge treatment at 200 kHz, the biogas improvement was particularly high (about 40%) at F/I=0.5. In fact, at F/I=1, the biogas gain was only +4% due to an evident slowdown of the biogas production of the sonicated sludge, due to the accumulation of soluble organic substances, evidenced by the soluble COD pattern, suggesting discoupling between hydrolysis and methanogenesis. Fluorescence In Situ Hybridization (FISH) analysis allowed to highlight the establishment in the anaerobic biomass of different methanogens responsible for the biogas production depending on the extent of readily biodegradable substrates availability for the methanogenesis or on the amount of inoculum utilised at the start up of the anaerobic digestion process.
机译：超声波预处理旨在将以顽固颗粒有机物为特征的废活性污泥转化为可溶的，更易生物降解的形式，从而最大程度地提高厌氧稳定性和沼气回收率。这项工作的目的是评估高频超声（200 kHz）的效率，以改善污泥厌氧消化性能。进行了平行分批厌氧消化测试，以评估食物或菌液比为0.5和1的20或200 kHz超声处理过的二次污泥的厌氧生物降解性。超声波预处理与频率无关，可加速初始水解阶段，效果更佳标记在高接种量下工作。此外，超声处理的污泥产生的沼气总是高于未处理的沼气。该增益似乎与消化20 kHz预处理污泥的F / I比无关，而在200 kHz污泥处理的情况下，在F / I =时沼气改善特别高（约40％）。 0.5。实际上，在F / I = 1时，由于超声处理污泥的沼气产生明显减慢（由于可溶性有机物的积累，可溶解的COD模式证明了这一点），沼气的增幅仅为+ 4％。在水解和甲烷生成之间。荧光原位杂交（FISH）分析可以突出显示厌氧生物质中负责沼气生产的不同产甲烷菌的建立，具体取决于产甲烷菌的易生物降解底物的可利用程度或启动沼气时使用的接种量。厌氧消化过程。

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