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首页> 外文期刊>Biomass & bioenergy >Design considerations for a farm-scale biogas plant based on pilot-scale anaerobic digesters loaded with rice straw and piggery wastewater
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Design considerations for a farm-scale biogas plant based on pilot-scale anaerobic digesters loaded with rice straw and piggery wastewater

机译：基于装有稻草和猪场废水的中试规模厌氧消化池的农场规模沼气厂的设计注意事项

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Two pilot-scale (1 m~3) digesters filled with untreated rice straw and co-digested with raw pig wastewater were operated to obtain design parameters for a farm-scale biogas plant. Both digesters contained 50 kg of dry straw mixed with diluted pig wastewater to create dry digestion conditions (20% TS) and operated for 189 days with leachate recirculation. Digester A was designed for optimum performance (150 L of pig wastewater and meso-philic temperatures) while Digester B was designed to establish minimum inputs (60 L of pig wastewater at ambient temperatures). The pig wastewater provided sufficient buffering capacity to maintain appropriate pH values (between 7.0 and 8.1) and nutrient balances (TOC to TKN ratios of 20 in Digester A and 32 in Digester B). Total biogas production was 22,859 L in Digester A and 1420 L from Digester B, resulting in specific methane yields of 231 and 12 L CH_4/kgVS added, respectively. Gas production in Digester A was directly correlated with temperature, but the overall lack of methanogenic activity was caused primarily by the reduced wastewater volume. Two theoretical farm-scale scenarios (considering both untreated and pretreated rice straw) were developed for a 100-ha rice farm. Either scenario can produce 100,000 m~3CH_ 4per year, yielding 328 MWh. Major differences including heat input, space requirements, loading frequency, digester volume, engine size, wastewater quantities, and additives are quantitatively defined. The appropriate choice for a farm-scale operation is the simplest model using untreated rice straw without additives, although six times more heat and twice as much reactor volume is required.
机译：操作两个装满未经处理的稻草并与生猪废水一起消化的中试规模（1 m〜3）沼气池，以获取农场规模沼气厂的设计参数。两个消化池都装有50千克干稻草和稀释的猪废水，以形成干消化条件（20％TS），并在渗滤液再循环的情况下运行189天。消化器A旨在实现最佳性能（150 L猪废水和中等温度），而消化器B旨在建立最小输入量（环境温度下60 L猪废水）。猪的废水提供了足够的缓冲能力，以维持适当的pH值（7.0和8.1之间）和养分平衡（消化器A中的TOC与TKN之比为20，消化器B中为32）。消化器A中的沼气总产量为22,859升，消化器B中的沼气总产量为1420升，分别产生的比甲烷产量分别为231和12 L CH_4 / kgVS。消化器A中的产气量与温度直接相关，但总体上产甲烷活性不足主要是由于废水量减少所致。为一个100公顷的稻米农场开发了两种理论上的农场规模方案（包括未处理和预处理的稻草）。两种方案每年均可产生100,000 m〜3CH_ 4，发电量328 MWh。定量定义了主要差异，包括热量输入，空间需求，装载频率，消化池体积，发动机尺寸，废水量和添加剂。农场规模操作的合适选择是使用未经处理的稻草无添加剂的最简单模型，尽管需要六倍的热量和两倍的反应器体积。

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