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Sludge Incineration Bottom Ash Enhances Anaerobic Digestion of Primary Sludge toward Highly Efficient Sludge Anaerobic Codigestion
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-02-07 , DOI: 10.1021/acssuschemeng.0c00015 Wei Wei 1 , Xiaoqing Liu 1 , Lan Wu 1 , Dongbo Wang 2 , Teng Bao 1 , Bing-Jie Ni 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-02-07 , DOI: 10.1021/acssuschemeng.0c00015 Wei Wei 1 , Xiaoqing Liu 1 , Lan Wu 1 , Dongbo Wang 2 , Teng Bao 1 , Bing-Jie Ni 1
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In wastewater treatment plants (WWTPs), two main sludge streams, i.e., primary sludge (PS) and waste activated sludge (WAS), are generally mixed for anaerobic codigestion. However, the methane production is usually restricted by the poor and slow biodegradability of PS, and an effective approach for its efficient codigestion with WAS is still lacking due to its highly different sludge properties from those of WAS. Herein, we reported a novel strategy through using the sludge incineration bottom ash to enhance the anaerobic digestion of PS and its codigestion with WAS. Biochemical methane potential (BMP) test results showed that ash additive at 0.6–1.2 g/g-dry matter (DM) significantly enhanced PS anaerobic digestion, identified by an up to 18.2% increase in specific methane production. This was accompanied by a significantly improved dewaterability in the digestate. The transformations of metabolic intermediates revealed that the ash additive accelerated the hydrolysis and acidogenesis processes, which were also supported by the increased hydrolysis rate (k) of PS determined through kinetic modeling. Ash additive was then experimentally demonstrated to be effective in enhancing the anaerobic codigestion of PS and WAS, with the increased volatile solids (VS) destruction being approximately 19.8%, representing a reduction of digestate volume by 12.6%. The novel strategy proposed in this study provides a new paradigm of an integrated sludge-control by sludge to bring significant economic benefits to wastewater treatment and sludge disposal.
中文翻译：
污泥焚化底灰增强了主要污泥的厌氧消化，向高效污泥厌氧消化
在废水处理厂（WWTP）中，通常将两种主要的污泥流，即初级污泥（PS）和废物活性污泥（WAS）混合在一起进行厌氧共消化。然而，甲烷的生产通常受到PS差的和缓慢的生物降解性的限制，并且由于其与WAS的污泥性质差异很大，因此仍然缺乏有效的与WAS共消化的有效方法。在这里，我们报道了一种通过使用污泥焚烧底灰来增强PS的厌氧消化及其与WAS共同消化的新策略。生化甲烷潜能（BMP）测试结果表明，灰分添加剂在0.6–1.2 g / g干物质（DM）下可显着增强PS厌氧消化，这可通过特定甲烷产量最多增加18.2％来确定。这伴随着消化物中脱水能力的显着改善。代谢中间体的转化表明，灰分添加剂加速了水解和产酸过程，水解速率的提高也支持了这一过程（通过动力学建模确定PS的k）。然后通过实验证明了灰分添加剂可有效增强PS和WAS的厌氧共消化，增加的挥发性固体（VS）破坏率约为19.8％，表示消化体积减少了12.6％。这项研究中提出的新策略为污泥综合控制污泥提供了新的范式，从而为废水处理和污泥处置带来了显着的经济效益。
更新日期：2020-02-07
中文翻译：
污泥焚化底灰增强了主要污泥的厌氧消化，向高效污泥厌氧消化
在废水处理厂（WWTP）中，通常将两种主要的污泥流，即初级污泥（PS）和废物活性污泥（WAS）混合在一起进行厌氧共消化。然而，甲烷的生产通常受到PS差的和缓慢的生物降解性的限制，并且由于其与WAS的污泥性质差异很大，因此仍然缺乏有效的与WAS共消化的有效方法。在这里，我们报道了一种通过使用污泥焚烧底灰来增强PS的厌氧消化及其与WAS共同消化的新策略。生化甲烷潜能（BMP）测试结果表明，灰分添加剂在0.6–1.2 g / g干物质（DM）下可显着增强PS厌氧消化，这可通过特定甲烷产量最多增加18.2％来确定。这伴随着消化物中脱水能力的显着改善。代谢中间体的转化表明，灰分添加剂加速了水解和产酸过程，水解速率的提高也支持了这一过程（通过动力学建模确定PS的k）。然后通过实验证明了灰分添加剂可有效增强PS和WAS的厌氧共消化，增加的挥发性固体（VS）破坏率约为19.8％，表示消化体积减少了12.6％。这项研究中提出的新策略为污泥综合控制污泥提供了新的范式，从而为废水处理和污泥处置带来了显着的经济效益。
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