In this research, the kinetics of COD biodegradation and biogas production in a moving bed biofilm reactor (MBBR) at pilot scale (10 m³) for piggery wastewater treatment were investigated. Polyethylene (PE) was used as a carrying material, with organic loading rates (OLRs) of 10, 15, and 18 kgCOD/m³ day in accordance to hydraulic retention times (HRTs) of 0.56, 0.37, and 0.3 day. The results showed that a high COD removal efficiency was obtained in the range of 68–78% with the influent COD of 5.2–5.8 g/L at all 3 HRTs. About COD degradation kinetics, in comparison to the first- and second-order kinetics and the Monod model, Stover–Kincannon model showed the best fit with R² 0.98 and a saturation value constant (K_B) and a maximum utilization rate (U_max) of 52.40 g/L day and 82.65 g/L day, respectively. The first- and second-order kinetics with all 3 HRTs and Monod model with the HRT of 0.56 day also obtained high R² values. Therefore, these kinetics and models can be further considered to be used for predicting the kinetic characteristics of the MBBR system in piggery wastewater treatment process. The result of a 6-month operation of the MBBR was that biogas production was mostly in the operating period of days 17 to 80, around 0.2 to 0.3 and 0.15–0.20 L/gCOD_converted, respectively, and then reduction at an OLR of 18 kgCOD/m³. After the start-up stage, day 35 biogas cumulative volume fluctuated from 20 to 30 m³/day and reached approximately 3500 m³ for 178 days during the whole digestive process. Methane is accounted for about 65–70% of biogas with concentration around 400 mg/L.

中文翻译：

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中规模移动床生物膜反应器（MBBR）处理养猪废水中有机物降解和沼气生成的动力学

在这项研究中，研究了中试规模（10 m ³）的移动床生物膜反应器（MBBR）中的COD生物降解和沼气产生的动力学，用于处理养猪废水。聚乙烯（PE）用作承载材料，根据水力停留时间（HRT）为0.56、0.37和0.3天，有机负载率（OLR）为10、15和18 kgCOD / m ³天。结果表明，在所有3个HRT上，COD去除率均在68-78％范围内，进水COD值为5.2-5.8 g / L。关于COD降解动力学，与一阶和二阶动力学以及Monod模型相比，Stover–Kincannon模型显示最佳拟合，R ² 0.98和饱和值常数（K _B）和最大利用率（U _max）分别为52.40 g / L天和82.65 g / L天。所有3个HRT的一阶和二阶动力学以及HRT为0.56天的Monod模型也获得了较高的R ²值。因此，这些动力学和模型可以进一步考虑用于预测养猪废水处理过程中MBBR系统的动力学特性。MBBR运行6个月的结果是，沼气生产主要在第17至80天的运行期内，分别_转换为0.2至0.3和0.15-0.20 L / gCOD ，然后在OLR为18时降低kgCOD / m ³。在启动阶段之后，第35天沼气的累积量从20波动至30 m³ /天，并在整个消化过程中达到178天约3500 m ³。甲烷约占沼气的65–70％，浓度约为400 mg / L。