ABSTRACT

The novelty of the presented research is the determination of the nitrogen and phosphorus fraction in the liquid fraction of digestate from agricultural biogas plants. This information is important because it can help in proposing possible further liquid fraction management or developing of new technologies for their purification. The research covered digestates from agricultural biogas plants, obtained from the fermentation of three different groups of waste, i.e. agricultural lignocellulosic waste (where corn silage was a monosubstrate or a dominant co-substrate), food waste (where fruit and vegetable waste or distillery residue were monosubstrate or dominant co-substrate) and livestock manure (where cow manure was a monosubstrate or a dominant co-substrate). Concentrations of nutrients in the liquid fraction of digestates varied within a wide range (230.9–649.1 mg PO₄³⁻/L and 1363–3211 mg N/L), and their content was determined by the feedstock characteristic. The highest concentrations of organic phosphorus were found in the liquid fraction of digestates from the fermentation of distillery brew and livestock manure, and the lowest in the fermentation of fruit and vegetable waste. In the liquid fraction of digestates from agricultural biogas plants, regardless of the composition of the feedstock, the dominant nitrogen form was ammonium nitrogen (from 60% to 90% TN). Organic nitrogen was dominated by CON fraction, which was from 35% to 54% of ON. It was 1.3–1.6 times higher than the DON fraction.

摘要

本研究的新颖之处在于测定农业沼气厂沼液液体部分中的氮和磷部分。此信息很重要，因为它可以帮助提出可能的进一步液体馏分管理或开发用于纯化的新技术。该研究涵盖了农业沼气厂的消化物，这些消化物是从三组不同废物的发酵中获得的，即农业木质纤维素废物（其中玉米青贮是单一底物或主要共底物）、食物垃圾（其中水果和蔬菜废物或酒厂残渣）是单底物或主要共底物）和牲畜粪便（其中牛粪是单底物或主要共底物）。₄ ³⁻ /L 和 1363–3211 mg N/L)，其含量由原料特性决定。在蒸馏酒和牲畜粪便发酵的消化物的液体部分中发现有机磷的浓度最高，而在水果和蔬菜废物的发酵中发现的有机磷浓度最低。在来自农业沼气厂的消化物的液体部分中，无论原料的组成如何，主要的氮形式是铵态氮（从 60% 到 90% TN）。有机氮以 CON 分数为主，占 ON 的 35% 至 54%。它比 DON 分数高 1.3-1.6 倍。