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Production, characterization, and evaluation of two types of slow-releasing carbon source tablets for in-situ heterotrophic nitrate denitrification in aquifers.
Chemosphere ( IF 8.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.chemosphere.2020.127478
Yuhoon Yeum 1 , Kyungjin Han 2 , Ji-Hyun Kang 3 , Dong-Wook Kim 4 , Chun-Woong Park 3 , Sooyoul Kwon 5 , Young Kim 6
Affiliation  

Slow-releasing carbon source tablets were manufactured for an in-situ biological denitrification system. The average zero-order nitrate degradation rates seen, from highest to lowest, were in microcosms to which lactate, fumarate, propionate, and formate had been added. Fumarate was approximately 80% cheaper than lactate, and consequently was determined to be the most optimal slow-releasing carbon source in tablet form. The slow-releasing precipitating tablet (SRPT) and slow-releasing floating tablet (SRFT) were manufactured with hydroxypropyl methylcellulose (HPMC) as the agent of release control, microcrystalline cellulose pH 101 (MCC 101) as the binder, #8 sand as the precipitation agent, and calcium carbonate and citric acid as floating agents. Fourier transform infrared spectroscopy and powder X-ray diffraction indicated that the crystal arrangement in the SRPTs and SRFTs was maintained and ordered in a manner similar to raw excipients. SRFTs floated in water within 30 min and remained so for 5 d due to the buoyancy of carbon dioxide. The carbon source release rate was proportional to the quantity of HPMC added. The longevities of SRPT with 300 mg of HPMC and SRFT with 400 mg of HPMC were 25.4 d and 37.3 d, respectively. This study observed that SRPT and SRFT were manufactured effectively and are suitable for in-situ slow-releasing biological systems.



中文翻译:

用于含水层中原位异养硝酸盐反硝化的两种类型的缓释碳源片的生产,表征和评估。

制造用于现场生物反硝化系统的缓释碳源片剂。从最高到最低,看到的平均零级硝酸盐降解速率是在微观范围内,其中添加了乳酸,富马酸酯,丙酸酯和甲酸酯。富马酸酯比乳酸便宜约80%,因此被确定为片剂形式的最佳缓释碳源。以羟丙基甲基纤维素(HPMC)为控制释放剂,微晶纤维素pH 101(MCC 101)为黏合剂,#8砂为缓释剂,制备缓释沉淀片(SRPT)和缓释浮片(SRFT)。沉淀剂,以及碳酸钙和柠檬酸作为漂浮剂。傅里叶变换红外光谱和粉末X射线衍射表明,SRPT和SRFT中的晶体排列与原始赋形剂相似,保持并排列有序。SRFTs在30分钟内漂浮在水中,并由于二氧化碳的浮力而保持5 d。碳源释放速率与HPMC的添加量成正比。SRPT含300 mg HPMC的寿命和SRFT含400 mg HPMC的寿命分别为25.4 d和37.3 d。这项研究观察到SRPT和SRFT是有效制造的,适用于原位缓慢释放的生物系统。碳源释放速率与HPMC的添加量成正比。SRPT含300 mg HPMC的寿命和SRFT含400 mg HPMC的寿命分别为25.4 d和37.3 d。这项研究观察到SRPT和SRFT是有效制造的,适用于原位缓慢释放的生物系统。碳源释放速率与HPMC的添加量成正比。SRPT含300 mg HPMC的寿命和SRFT含400 mg HPMC的寿命分别为25.4 d和37.3 d。这项研究观察到SRPT和SRFT是有效制造的,适用于原位缓慢释放的生物系统。

更新日期:2020-07-16
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