The paper presents the research results of the supercritical water oxidation (SCWO) of poultry manure continuously fed into a tubular reactor both in the absence and presence of methane as an auxiliary fuel. The tests were conducted at a temperature gradient along the vertical axis of the reactor (top to bottom: 390–600 °C), a pressure of 25 MPa, and varying reagent flow rates. It is shown that due to heat generation during methane oxidation the energy consumption from external sources is reduced by 1.3–1.5 times depending on the ratio of reagent flow rates. The gas products contain CO, N, and trace amounts of NO. The ash residues are predominantly composed of calcite and hydroxyapatite. The addition of methane results in a reduction in the content of phenols and polycyclic aromatic hydrocarbons present in the aqueous effluent, while content of N-bearing aromatics increases. The formation of nitrophenols was observed at elevated oxygen concentrations in the reaction mixture. It was revealed that excess oxygen plays a pivotal role in the efficacy of organic nitrogen removal. The formation of mineral acids and a high level of ammonia in the reaction mixture during the SCWO of poultry manure result in corrosion of stainless steel and copper seals, which in turn leads to an increased concentration of chromium and copper in the aqueous effluent. The results obtained indicate the potential for utilizing natural gas in an environmentally friendly and resource-saving manner for poultry manure processing by SCWO in autothermal mode.

中文翻译：

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流动模式下甲烷添加对家禽粪便超临界水氧化的影响


本文介绍了在不存在和存在甲烷作为辅助燃料的情况下将家禽粪便连续送入管式反应器的超临界水氧化（SCWO）的研究结果。测试是在沿反应器垂直轴的温度梯度（从上到下：390-600°C）、25 MPa 的压力和不同的试剂流速下进行的。结果表明，由于甲烷氧化过程中产生热量，外部能源消耗可减少 1.3-1.5 倍，具体取决于试剂流量的比率。气体产物含有CO、N 和痕量的NO。灰渣主要由方解石和羟基磷灰石组成。甲烷的添加导致水流出物中存在的酚和多环芳烃的含量减少，而含氮芳烃的含量增加。在反应混合物中氧气浓度升高时观察到硝基苯酚的形成。结果表明，过量的氧气对有机氮的去除效果起着关键作用。家禽粪便超临界水氧化过程中，反应混合物中形成无机酸和高含量的氨，导致不锈钢和铜密封件腐蚀，进而导致废水中铬和铜的浓度增加。获得的结果表明，以环境友好和资源节约的方式利用天然气进行超临界水氧化自热模式处理家禽粪便的潜力。