Modelling of the anaerobic semi-continuous co-digestion of sewage sludge and wine distillery wastewater,Environmental Science: Water Research & Technology

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Modelling of the anaerobic semi-continuous co-digestion of sewage sludge and wine distillery wastewater
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-05-20 , DOI: 10.1039/d0ew00275e
Vanessa Ripoll _{1,

2,

3,

4} , Cristina Agabo-García _{1,

2,

3,

4} , Rosario Solera _{1,

2,

3,

4} , Montserrat Perez _{1,

2,

3,

4}

Affiliation

The semi-continuous mesophilic anaerobic co-digestion of sewage sludge and wine distillery wastewater was investigated. In this sense, the effects of reducing the hydraulic retention time (HRT, from 20 d to 8 d) on the degradation of organic matter and methane production were determined. The experimental results showed that anaerobic co-digestion enhanced the biodegradability of the mixture in terms of VS and COD_T (7–8% higher) for HRT = 8 d. The methane productivity at HRT = 8 d (18.0 L_CH₄ kg_VS⁻¹ d⁻¹) was also enhanced (30% higher) compared to that obtained in the control experiment. In addition, a mathematical kinetic model was proposed to determine the rate-limiting step of the process. Stoichiometric parameters obtained for SS : WDW (0.115 kg_CH₄ kg_COD⁻¹) was higher than SS (0.094 kg_CH₄ kg_COD⁻¹), which means that co-digestion increased the rate of consumption because of the higher amount of biodegradable compounds. The kinetic study showed that anaerobic co-digestion favoured the methane production rate enhancing the acetate consumption step and making methanogenesis the rate-limiting step in this process.

中文翻译：

污水污泥与酿酒厂废水厌氧半连续共消化模拟

研究了污水污泥和酿酒厂废水的半连续中温厌氧消化。从这个意义上讲，确定了将水力停留时间（HRT，从20 d减少到8 d）对有机物降解和甲烷生成的影响。实验结果表明，对于HRT = 8 d ，厌氧共消化提高了混合物的生物降解能力，就VS和COD _T而言（高出7-8％）。HRT时的甲烷生产率= 8 d（18.0 L _{CH ₄} kg _VS^-1 d ^-1与对照实验相比，）也得到了增强（提高了30％）。此外，提出了一个数学动力学模型来确定该过程的限速步骤。SS：WDW（0.115 kg _{CH ₄} kg _COD^-1）的化学计量参数高于SS（0.094 kg _{CH ₄} kg _COD^-1），这意味着共消化增加了消耗率，因为可生物降解的量更高化合物。动力学研究表明，厌氧共消化有利于甲烷产生速率，从而增加了乙酸盐的消耗步骤，并使甲烷生成成为该过程中的限速步骤。

更新日期：2020-07-02

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