Anaerobic digestion found limited use in sludges from industrial wastewater treatment plants (WWTPs). So, it is of interest to assess the biodegradability and co-digestion performance of industrial sludges of biological origin alone and when mixed with municipal sludge. In this study, sludge from two different organized industrial districts (OIDs) and textile industry WWTPs are individually mixed with municipal sludge with and without ultrasound pretreatment to investigate their energy production potential and digestibility using biochemical methane potential tests. Sludges were used at different mass ratios in reactors with F/M ratio of 1. During operation, biogas amount and methane percentage were measured. Before and after reactor operation, total solids (TS), volatile solids (VS), chemical oxygen demand (COD) and pH were measured as performance indicators of digestion. Methane production potential was highest in reactors containing only municipal sludge and lowest containing only industrial sludge. The specific methane production normalized with COD removed for OID I, OID II and textile sludges were 0.13 L/g, 0.11 L/g and 0.11 L/g, respectively; whereas average specific methane production for municipal sludge was 0.31 L/g. COD, TS and VS reductions were lower in industrial sludges compared to domestic sludge. The co-digestion reactors with mixed industrial and municipal sludge performed in accordance with the proportion of two sludges. Ultrasonication improved the digestion performance. Although adding industrial sludge reduced the observed biogas amount to lower than that expected, results show that it is possible to co-digest some industrial sludges with municipal sludge in closely coordinated additions (about < 20%).

Graphic Abstract

中文翻译：

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工业污泥与城市污泥的共消化潜力

厌氧消化发现来自工业废水处理厂（WWTP）的污泥用途有限。因此，评估单独的生物来源的工业污泥以及与城市污泥混合的工业污泥的生物降解性和共同消化性能是很有意义的。在这项研究中，将来自两个不同的有组织工业区（OID）和纺织工业污水处理厂的污泥分别与市政污泥混合，并进行了超声波预处理和不进行超声波预处理，以利用生化甲烷潜力测试研究其能源生产潜力和消化率。F / M比为1的反应器中，污泥以不同的质量比使用。在运行过程中，测量了沼气量和甲烷百分比。反应堆运行前后，总固体（TS），挥发性固体（VS），测量化学需氧量（COD）和pH作为消化的性能指标。在仅包含城市污泥的反应器中，甲烷的生产潜力最高，而仅包含工业污泥的反应器的最低甲烷生产潜力。对于OID I，OID II和纺织品污泥，去除COD进行标准化的比甲烷产量分别为0.13 L / g，0.11 L / g和0.11 L / g。而城市污泥的平均比甲烷产量为0.31 L / g。与生活污泥相比，工业污泥的COD，TS和VS减少量更低。工业和城市污泥混合的共消化反应器按照两种污泥的比例运行。超声处理改善了消化性能。尽管添加工业污泥会使观察到的沼气量降低到低于预期的水平，

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