a College of Water Resources and Civil Engineering, China Agricultural University , Beijing , People's Republic of China.
b Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture and Rural Affairs , Beijing , People's Republic of China.
J Air Waste Manag Assoc. 2019 May;69(5):592-602. doi: 10.1080/10962247.2019.1567621. Epub 2019 Mar 26.
Electrolyzed water (EW) is an effective disinfectant with a wide range of pH. EW in acid range was proved to be an ammonia absorbent which make it valuable for wet scrubbers used in animal feeding operations (AFOs). This study aimed to optimize the design and operating parameters of a wet scrubber with EW spray for ammonia removal, based on the size distribution of droplets, the property of EW and the reduction efficiency of ammonia. The optimized parameters included droplet size, nozzle flow rates, pH and available chlorine concentration (ACC) of EW, nozzle number at single stage, stage number, initial ammonia concentration and air speed in the duct. The ammonia removal efficiency increased with the decrease of droplet size and the increase of flow rate. The pH values of EW showed significant influence on ammonia removal efficiency (P ˂ 0.05), while ACC of the EW showed no significant influence (P > 0.05). For inlet ammonia concentration of 70 ppm with one and three spray stages, the wet scrubber with EW (pH = 1.35) spray was able to reduce 55.8 ± 4.3 % and 97.2 ± 3.0 % of ammonia, respectively, when the nozzles with 0.9 mm orifice diameter operated at a flow rate of 1.20 L min. Response surface analysis showed that orifice diameter, nozzle flow rate, and their combination were all significant factors impacting ammonia removal efficiency for both pH =1.35 and 5.50 at a 95% confidence level. Optimal ammonia removal efficiency was obtained at orifice diameter 0.9 mm and flow rate 1.20 L min within the selected range. The results of this study demonstrated that wet scrubber with EW spray could be a very effective and feasible ammonia mitigation technology for animal feeding operation. Implications: It is difficult to effectively reduce ammonia emitted from the animal feeding operations (AFOs). Both the acidity and disinfection effects of electrolyzed water (EW) make it a potential absorbent used for spray in wet scrubber to reduce the ammonia and microorganisms. Based on some preliminary field test results, lab tests were conducted to optimize the design and operation parameters of a wet scrubber with EW spray to improve the ammonia removal efficiency. A better understanding of the application and influence factors of the wet scrubber with EW spray can contribute to effective mitigation of ammonia emission from animal houses and improve the atmosphere air quality.
电解水（EW）是一种有效的消毒剂，具有广泛的 pH 值范围。酸性范围内的 EW 已被证明是一种氨吸收剂，这使其在动物饲养场（AFO）中使用的湿式洗涤器中具有价值。本研究旨在基于液滴的大小分布、EW 的特性和氨的还原效率，优化带有 EW 喷雾的湿式洗涤器的设计和操作参数，用于去除氨。优化的参数包括液滴尺寸、喷嘴流量、EW 的 pH 值和有效氯浓度（ACC）、单级的喷嘴数量、级数、初始氨浓度和管道中的空气速度。氨去除效率随液滴尺寸的减小和流量的增加而增加。EW 的 pH 值对氨去除效率有显著影响（P ˂ 0.05），而 EW 的 ACC 没有显著影响（P ＞0.05）。对于 70ppm 的入口氨浓度，在具有一级和三级喷雾的情况下，当具有 0.9mm 孔径的喷嘴以 1.20Lmin 的流速运行时，带有 EW（pH=1.35）喷雾的湿式洗涤器分别能够减少 55.8±4.3%和 97.2±3.0%的氨。响应面分析表明，在 95%置信水平下，孔径、喷嘴流量及其组合都是影响 pH=1.35 和 5.50 时氨去除效率的重要因素。在所选择的范围内，在孔径为 0.9mm 和流速为 1.20Lmin 时，可获得最佳的氨去除效率。本研究结果表明，带有 EW 喷雾的湿式洗涤器可能是一种非常有效和可行的动物饲养场氨减排技术。意义：难以有效减少动物饲养场（AFO）排放的氨气。电解水（EW）的酸度和消毒效果使其成为用于湿式洗涤器喷雾的潜在吸收剂，以减少氨和微生物。基于一些初步的现场测试结果，进行了实验室测试，以优化带有 EW 喷雾的湿式洗涤器的设计和操作参数，以提高氨去除效率。更好地了解 EW 喷雾湿式洗涤器的应用和影响因素有助于有效减少动物房屋的氨气排放，并改善大气空气质量。
