Research on recovery of nitrogen released in composting process

堆肥过程释放氮的回收研究

• 批准号: 61550392
• 负责人: FUJITA Kenji
• 金额: $ 1.15万
• 依托单位: The University of TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550392/
• 关键词: Composting; Ammonia gas; Low fatty acids; Adsorption; Ammonia removal; アンモニア除去; アンモニア回収; 発酵過程; 窒素成分; アンモニアの揮散; アンモニアの吸収

In composting process, ammonia gas is released in well digesting period. On the other hand, low fatty acids tends to generate in initial period of composting, because of higher digestion rate than oxygen supply rate.The released ammonia gas causes not only environmental polution but also lossof nitrogen as a resource. If it is abailable to recover ammonia or to blow it into the compost generating fatty acids, it well 1) solve environmental pollution problem, 2) minize the nitrogen loss in compost and 3) promote the digestion rate by neutralizing in pH.The research has conducted to get fundamental knowledge to recover the released ammonia gas by compost itself as adsorption media.The results are as follows;1) The loss of nitrogen by releasing of ammonia gas in composting process reaches 50% of nitrogen in raw material.2) Adsorbable ammonia quantity by compost is linear both to water/dry-solid ratio and acid concentration.3) The removable ammonia gas quantity by compost-packed-tower is independent from gas concentration.4) The adsorbed ammonia is hardly nitrified in first digestion period even if it is controlled in optimal pH and temperature range, because the ammonium concentration in liquid phase of the compost is much higher than optimal range.

在堆肥过程中，氨气在充分消化期释放。另一方面，由于堆肥的消化速率高于供氧速率，在堆肥初期容易产生低脂肪酸，释放的氨气不仅污染环境，而且造成氮素资源的损失。如果能够回收氨气或将氨气吹入产生脂肪酸的堆肥中，将能很好地解决环境污染问题，减少堆肥中氮素的损失，提高堆肥的消化率。1）堆肥过程中释放氨气损失的氮素可达原料氮素的50%; 2）堆肥可吸附的氨气量与水/干固比和酸浓度呈线性关系; 3）堆肥填料塔可去除的氨气量与气体浓度无关。由于堆肥液相中铵态氮浓度远高于最佳范围，因此即使在最佳pH和温度范围内，吸附态氨在第一消化期也难以硝化。

项目成果

BAE, Y.J., H. KANEKO and K. FUJITA: "Number of Microorganisms in Composting Process" Proc. of 42nd annual Conference of the Japan Society of Civil Engineers. 2. 984-985 (1987)

BAE、Y.J.、H. KANEKO 和 K. FUJITA：“堆肥过程中微生物的数量”Proc。

金子栄廣,藤田賢二,福田一美: 環境科学シンポジウム. 197 (1987)

Eihiro Kaneko、Kenji Fujita、Kazumi Fukuda：环境科学研讨会 197（1987）。

FUKUDA,K., K. FUJITA and H. KANEKO: "Absorption of Ammonia gas by Compost" Proc. of 41st Annual Conference of the Japan Society of Civil Engineers. 2. 889-890 (1986)

FUKUDA,K.、K. FUJITA 和 H. KANEKO：“堆肥对氨气的吸收”Proc。