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Leaching of phosphorus from incinerated sewage sludge ash by means of acid extraction followed by adsorption on orange waste gel

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Journal of Environmental Sciences 2009年第12期21卷 1753-1760页

作者： Biplob Kumar Biswas Katsutoshi Inoue Hiroyuki Harada Keisuke Ohto hidetaka kawakita Department of Applied Chemistry Saga University

Ashes from sewage sludge incineration have a high phosphorus content, approximately 8% （W/W）, which indicates a potential resource of the limiting nutrient. Incineration of sewage sludge with subsequent recovery of phosphorus is a relatively new sludge treatment technique. In this article, the leaching of phosphorus by using sulfuric acid as well as hydrochloric acid by means of several batch experiments was presented. At the same time a selective recovery of phosphorus by adsorption was also discussed. The effects of acid concentration, temperature and time on extraction were studied. The phosphorus leaching increased with the increase in acid concentration and temperature. Kinetic studies showed that the complete leaching of phosphorus took place in less than 4 h. Selective adsorption of phosphorus by using orange waste gel provided a hint for recovery of this natural resource, which eventually could meet the ever-increasing requirement for phosphorus. The overall results indicated that the incinerated sewage sludge ash can be treated with acid to efficiently recover phosphorus and thus can be considered a potentially renewable source of phosphorus.

关键词： sewage sludge ash phosphorus metals acid extraction recovery

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Papain Activity in Dextran Solution for Keratin Hydrolysis

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Advances in Enzyme Research 2014年第1期2卷 49-53页

作者： Nanami Hara Shintaro Morisada Keisuke Ohto hidetaka kawakita Department of Applied Chemistry Saga University Saga Japan

High concentration of polymer solution in cosmetics has the essential role in keeping water on peel of skin. This study includes the papain activity in the high concentrated dextran solution for keratin hydrolysis. Papain is the industrial and a representative hydrolase. The concentration of dextran was ranged to 100 g/L. In the increasing concentration of dextran, the activity of papain decreased due to the low diffusivity of papain and substrate. Even in concentrated dextran solution, keratin powder was possible to be hydrolyzed at the high efficiency.

关键词： Dextran Papain Keratin Hydrolysis

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Environmentally Benign Adsorption Materials for Removing Arsenic from Aquatic Environment

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Advances in Materials Physics and Chemistry 2018年第1期8卷 51-70页

作者： Katsutoshi Inoue Hiroyuki Harada Kedar Nath Ghimire Biplob Kumar Biswas hidetaka kawakita Keisuke Ohto Department of Applied Chemistry Faculty of Science & Engineering Saga University Saga Japan Department of Environmental Science Prefectural University of Hiroshima Shobara Japan Central Department of Chemistry Tribhuvan University Kathmandu Nepal Department of Chemical Engineering Jessore University of Science and Technology Jessore Bangladesh

Adsorptive removal of arsenic using adsorption gels prepared from orange and apple juice residues was reviewed by summarizing the authors’ previous papers. Orange and apple juice residues contain a large amount of pectin, partly methyl-esterified pectic acid, which exhibits high affinity for high-valent metal ions such as iron(III), rare earths(III) and zirconium(IV). Anionic species of arsenic(III, V) are effectively and selectively adsorbed on pectic acid gel via loading these high-valent metal ions. Raw orange juice residue was saponified using calcium hydroxide to improve the loading capacity for these metal ions. It was found that zirconium(IV) exhibits the most suitable adsorption behaviors for arsenic(III, V). Similar result was obtained also for apple juice residue. An actual sample of acid mine drainage from the Horobetsu mine which contained a high concentration of iron and low concentration of arsenic, was tested using the adsorption gel prepared from orange juice residue and the results were compared with those from the current treatment process based on coprecipitation with iron hydroxide. The new process using the above- mentioned adsorption gel was proposed for treatment of such acid mine drainage.

关键词： Adsorbents Arsenic Orange Wastes Removal Aquatic Environment

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Leaching behavior of heavy metals with hydrochloric acid fromfly ash generated in municipal waste incineration plants

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Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1422-1427页

作者：黄凯井上胜利原田浩幸川喜田英孝大渡启介北京科技大学有色冶金系北京100083 佐贺大学应用化学系

The extraction behavior of heavy metals from municipal waste incineration （MWI） fly ash was investigated systematically. The extraction process includes two steps, namely, fly ash was firstly washed with water, and then subjected to hydrochloric acid leaching. The main parameters for water washing process were tested, and under the optimal conditions, about 86% Na, 70% K and 12% Ca were removed from fly ash, respectively. Hydrochloric acid was used for the extraction of valuable elements from the water-washed fly ash, and the optimal extraction was achieved for each heavy metal as follows： 86% for Pb, 98% for Zn, 82% for Fe, 96% for Cd, 62% for Cu, 80% for Al, respectively. And the main compositions of the finally obtained solid residue are Ca2PbO4, CaSi2Os, PbsSiO7, Ca3A12Si3012 and SiO2.

关键词： municipal waste incineration fly ash heavy metals leaching hydrochloric acid

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