Recycled paper mill effluent (RPME) consists of various organic and inorganic compounds. In this study, modified anaerobic hybrid baffled (MAHB) bioreactor has been successfully used to anaerobically digest RPME. The anaerobic digestion was investigated in relation to methane production rate, lignin removal, and chemical oxygen demand (COD) removal, with respect to organic loading rate (OLR) and hydraulic retention time (HRT). The analysis using kinetic study was carried out under mesophilic conditions (37 ± 2 °C) and influent COD concentrations (1000-4000 mg L-1), to prove its practicability towards RPME treatment. First-order kinetic model was used to clarify the behavior of RPME anaerobic digestion under different OLRs (0.14-4.00 g COD L-1 d-1) and HRT (1-7 d). The result shows that the highest COD removal efficiency and methane production rate were recorded to be 98.07% and 2.2223 L CH4 d-1, respectively. This result was further validated by evaluating the biokinetic coefficients (reaction rate constant (k) and maximum biogas production (ym)), which gave values of k = 0.57 d-1 and ym = 0.331 L d-1. This kinetic data concludes that MAHB presented satisfactory performance towards COD removal with relatively high methane production, which can be further utilized as on-site energy supply.

中文翻译：

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在改进的厌氧混合折流板（MAHB）反应器中评估再生造纸厂废水的消化：反应器性能和动力学研究。

再生造纸厂废水（RPME）由各种有机和无机化合物组成。在这项研究中，改性厌氧混合挡板（MAHB）生物反应器已成功用于厌氧消化RPME。研究了厌氧消化的甲烷产生速率，木质素去除率和化学需氧量（COD）去除率，以及有机负荷率（OLR）和水力停留时间（HRT）。在中温条件下（37±2°C）和进水COD浓度（1000-4000 mg L-1）进行了动力学研究分析，证明了其对RPME治疗的实用性。一级动力学模型用于阐明在不同的OLR（0.14-4.00 g COD L-1 d-1）和HRT（1-7 d）下RPME厌氧消化的行为。结果表明，最高的COD去除效率和甲烷产生率分别记录为98.07％和2.2223 L CH4 d-1。通过评估生物动力学系数（反应速率常数（k）和最大沼气产生量（ym））进一步验证了该结果，其得出k = 0.57 d-1和ym = 0.331 L d-1的值。该动力学数据得出结论，MAHB在甲烷生成量相对较高的COD去除方面表现出令人满意的性能，可进一步用作现场能源供应。