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Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-02-08 , DOI: 10.1021/acssuschemeng.1c07861 Jiawei Hu 1, 2 , Zhuo Li 1 , Wenquan Tao 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2022-02-08 , DOI: 10.1021/acssuschemeng.1c07861 Jiawei Hu 1, 2 , Zhuo Li 1 , Wenquan Tao 1
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This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)2] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)2 dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)2 dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)2 efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)2 pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)2. The two decomposition products of Ca(ClO)2, Ca(OH)2 and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)2 being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)2 pretreatment, with the abundances found to be 3.21 and 45.62% in control and Ca(ClO)2-pretreated fermenters, respectively. After fermentation, the Ca(ClO)2-pretreated sludge showed better dewaterability than the control, and the organic pollutants diclofenac and sulfamethazine, as well as the fecal coliforms, were largely removed by Ca(ClO)2.
中文翻译：
次氯酸钙促进废活性污泥暗发酵制氢
本研究报道了一种使用次氯酸钙 [Ca(ClO) 2 ] 提高厌氧发酵性能的高效低成本污泥预处理方法。实验结果表明，当 Ca(ClO) 2用量从 0 增加到 1.5 g/L 再降低到 13.80 mL/g VSSs 时，累积氢气产量从 1.87 mL/g VSSs 提高到 16.72 mL/g VSSs当Ca(ClO) 2用量达到1.8 g/L时。机理研究表明，Ca(ClO) 2有效地破坏了污泥细胞外聚合物和微生物细胞，为后续的生化过程产生了更多的可溶性有机物。除此之外，Ca(ClO) 2促进了污泥有机物的生物降解性预处理。生化反应动力学分析表明，用Ca(ClO) 2处理后，导致耗氢的微生物的活性受到严重抑制。Ca(ClO) 2的两种分解产物Ca(OH) 2和HClO对氢气产率有正向影响，其中Ca(OH) 2的贡献大于HClO。微生物群落分析表明，Ca(ClO) 2 预处理显着富集了发酵微生物，在对照和Ca(ClO) 2预处理发酵罐中的丰度分别为3.21%和45.62% 。发酵后，Ca(ClO) 2预处理后的污泥比对照污泥具有更好的脱水能力，有机污染物双氯芬酸和磺胺二甲嘧啶以及粪大肠菌群被Ca(ClO) 2大部分去除。
更新日期：2022-02-08
中文翻译：
次氯酸钙促进废活性污泥暗发酵制氢
本研究报道了一种使用次氯酸钙 [Ca(ClO) 2 ] 提高厌氧发酵性能的高效低成本污泥预处理方法。实验结果表明，当 Ca(ClO) 2用量从 0 增加到 1.5 g/L 再降低到 13.80 mL/g VSSs 时，累积氢气产量从 1.87 mL/g VSSs 提高到 16.72 mL/g VSSs当Ca(ClO) 2用量达到1.8 g/L时。机理研究表明，Ca(ClO) 2有效地破坏了污泥细胞外聚合物和微生物细胞，为后续的生化过程产生了更多的可溶性有机物。除此之外，Ca(ClO) 2促进了污泥有机物的生物降解性预处理。生化反应动力学分析表明，用Ca(ClO) 2处理后，导致耗氢的微生物的活性受到严重抑制。Ca(ClO) 2的两种分解产物Ca(OH) 2和HClO对氢气产率有正向影响，其中Ca(OH) 2的贡献大于HClO。微生物群落分析表明，Ca(ClO) 2 预处理显着富集了发酵微生物，在对照和Ca(ClO) 2预处理发酵罐中的丰度分别为3.21%和45.62% 。发酵后，Ca(ClO) 2预处理后的污泥比对照污泥具有更好的脱水能力，有机污染物双氯芬酸和磺胺二甲嘧啶以及粪大肠菌群被Ca(ClO) 2大部分去除。
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