Abstract:
With the rapid development of breeding industry, the efficient treatment of dramatically increasing swine wastewater is gradually becoming urgent. In particular, the development of application technologies suitable for the relatively small piggeries is critical due to the time cost and space requirements of conventional biological methods. In this study, Electrochemical oxidation (EO) was selected to systematically explore the treatment performance of three different swine wastewaters by Ti4O7 anode. It was observed that the colors changed from dark brown to light yellow after 60 min treatment at 50 mA/cm2, and the removal rates of turbidity and suspended solids ranged from 89.36% to 93.65% and 81.31% to 92.55%, respectively. The chemical oxygen demand (COD), ammonia nitrogen (NH3-N) and total phosphorus (TP) of all the three swine wastewaters were simultaneously removed to a very low concentration in 120 min, especially for sample III, 61 ± 9 mg/L of COD, 6.6 ± 0.4 mg/L of NH3-N and 5.7 ± 1.1 mg/L of TP, which met the Discharge Standard of Pollutants for Livestock and Poultry Breeding (GB 18596-2001). Moreover, 70.93%-85.37% mineralization rates were also achieved in 120 min, confirming that EO treatment by Ti4O7 could efficiently remove the organic matters in wastewater. Excitation-emission matrix (EEM) and UV-vis spectrum characterization results further proved that aromatic compounds and macromolecules in wastewater were rapidly removed, which played important roles in the mineralization processes. The findings here provided an efficient and environment-friendly technology for swine wastewater treatment.
摘要:
随着养殖业的快速发展,对急剧增加的养猪废水的高效处理逐渐成为当务之急。特别是,由于传统生物方法的时间成本和空间要求,开发适用于相对较小的猪场的应用技术至关重要。在这项研究中,选择电化学氧化(EO),系统地探讨了Ti4O7阳极对三种不同猪废水的处理性能。观察到在50mA/cm2下处理60分钟后,颜色由深棕色变为浅黄色,浊度和悬浮物的去除率为89.36%至93.65%和81.31%至92.55%,分别。化学需氧量(COD),所有三种猪废水的氨氮(NH3-N)和总磷(TP)在120分钟内同时去除至非常低的浓度,尤其是样本III,61±9mg/L的COD,6.6±0.4mg/L的NH3-N和5.7±1.1mg/L的TP,符合《畜禽养殖污染物排放标准》(GB18596-2001)。此外,在120分钟内也实现了70.93%-85.37%的矿化率,证实了Ti4O7处理EO可以有效去除废水中的有机物。激发-发射矩阵(EEM)和紫外-可见光谱表征结果进一步证明了废水中的芳香族化合物和大分子,在成矿过程中发挥了重要作用。该研究结果为养猪废水处理提供了一种高效、环保的技术。