采用钠丝光沸石吸附与氨汽提相结合的方法从水解尿液中回收 N、P、K，并进行（K-）鸟粪石沉淀。
N, P, K recovery from hydrolysed urine by Na-chabazite adsorption integrated with ammonia stripping and (K-)struvite precipitation.
机构信息
BioEngine, Research Team on Green Process Engineering and Biorefineries, Chemical Engineering Department, Université Laval, 1065, avenue de la Médecine, Québec, QC G1V 0A6, Canada; CentrEau, Centre de recherche sur l'eau, Université Laval, 1065, avenue de la Médecine, Québec, QC G1V 0A6, Canada.
Northern Analytical Lab Services, University of Northern British Columbia, Prince George, BC, Canada; Chemistry Department, Faculty of Science and Engineering, University of Northern British Columbia, Canada.
出版信息
Sci Total Environ. 2023 Jan 20;857(Pt 1):159277. doi: 10.1016/j.scitotenv.2022.159277. Epub 2022 Oct 7.
This study investigated the recovery of K along with NH-N and PO-P from hydrolyzed urine by technical integration. The K adsorption capacities of biochar, clinoptilolite, artificial zeolite and chabazite were firstly compared. Due to the high K recovery efficiency and additional P recovery capacity, Na-chabazite was selected as the adsorbent in this study. Its kinetics and isotherm analysis indicated that the high molarity of NH-N seriously hindered the K adsorption onto Na-chabazite in synthetic hydrolyzed urine (SHU). However, this competition between NH and K got diminished when their molarity is the same, i.e. in the SHU after ammonia stripping (ASSHU). Based on this key finding, Na-chabazite adsorption was integrated with ammonia stripping and struvite precipitation under different configurations. Simultaneous ammonia stripping was inadequate to diminish the competitive effect of NH on K adsorption. Depending on the demand for fertilizer, two sequential configurations were recommended, respectively.
本研究通过技术集成，考察了从水解尿液中回收 K 以及 NH-N 和 PO-P 的情况。首先比较了生物炭、斜发沸石、人造沸石和丝光沸石对 K 的吸附能力。由于 Na-丝光沸石具有较高的 K 回收率和额外的 P 回收能力，因此被选为该研究的吸附剂。动力学和等温线分析表明，在合成水解尿液（SHU）中，高浓度的 NH-N 严重阻碍了 K 吸附到 Na-丝光沸石上。然而，当 NH 和 K 的摩尔浓度相同时，这种竞争关系会减弱，即在氨汽提后的 SHU（ASSHU）中。基于这一关键发现，在不同配置下，Na-丝光沸石吸附与氨汽提和鸟粪石沉淀相结合。同时进行的氨汽提不足以降低 NH 对 K 吸附的竞争影响。根据对肥料的需求，推荐了两种连续的配置方式。
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