The use of rice straw for biochar production has been widely proved as a great alternative energy source, which not only is cheaper than other commercial coals but also helps mitigation of climate change. In this study, the rice straw–derived biochar was assessed as a sorption material used for livestock wastewater treatment, which has not much been studied so far. The biochar derived from rice straw had moisture content of 4.9 ± 0.5 %, bulk density of 0.38 ± 0.03 g/cm³, iodine number of 958.0 ± 37.0 mg/g, and pH was determined at 7.6 ± 0.1. The optimal contact time, biochar mass concentration, and pH were determined as 3.0 h, 4.0 g/L, and 9.0, respectively. The COD and BOD₅ removal efficiencies were up to 40.0% via the batch experiment. However, the column test results showed the higher removal efficiencies which were 79.0 ± 6.1% for COD and 84.0 ± 2.5% for BOD₅ with the influent COD concentration of 373.0 ± 8.0 mg/L and BOD₅ concentration of 240.0 ± 3.0 mg/L_. The effluent all met the current livestock wastewater discharge standard of Vietnam (QCVN 62-MT:2016/BTNMT). These findings indicate the potential of using straw-derived biochar as a good material for removing organic pollutants from livestock wastewater.

稻草用于生物炭生产已被广泛证明是一种很好的替代能源，它不仅比其他商品煤便宜，而且有助于缓解气候变化。在这项研究中，稻草衍生的生物炭被评估为用于牲畜废水处理的吸附材料，迄今为止尚未进行大量研究。源自稻草的生物炭的含水量为4.9±0.5％，堆积密度为0.38±0.03 g / cm ³，碘值为958.0±37.0 mg / g，pH值为7.6±0.1。最佳接触时间，生物炭质量浓度和pH分别确定为3.0 h，4.0 g / L和9.0。化学需氧量和生化需氧量₅通过分批实验，去除效率高达40.0％。但是，色谱柱测试结果表明，进水COD浓度为373.0±8.0 mg / L，BOD ₅浓度为240.0±3.0 mg / L时，COD的去除效率更高，BOD _5的去除效率为84.0±2.5％。_。废水均符合越南现行的畜禽废水排放标准（QCVN 62-MT：2016 / BTNMT）。这些发现表明，使用秸秆生物炭作为从牲畜废水中去除有机污染物的好材料的潜力。