https://scholars.lib.ntu.edu.tw/handle/123456789/408281
Title: | Effect of alkali metal cation on the anaerobic hydrolysis and acidogenesis of vegetable waste | Authors: | He P.-J. L? F. Shao L.-M. Pan X.-J. Lee D.-J. |
Keywords: | Acidogenesis;Alkali metal cation;Hydrolysis;Inhibition;Vegetable waste | Issue Date: | 2006 | Journal Volume: | 27 | Journal Issue: | 3 | Start page/Pages: | 317-327 | Source: | Environmental Technology | Abstract: | Five batch testing scenarios were designed to evaluate the effects of alkali metal cations on anaerobic hydrolysis and acidogenesis. These scenarios were A (c=0 g l-1), B (cNa+=25 g l-1), C (cNa+=50 g l-1), D (CK+=25 g l-1), and E (cK+=50 g l-1, pH 7.0). A solution pH of 7.0 or above favored protein hydrolysis, higher proteinase activity and higher ammonia production. However, such a pH suppressed carbohydrate hydrolysis, as indicated by low α-amylase activity. Cation interference at pH 5.0-6.0 seemed not to affect carbohydrate hydrolysis, as showed by the unimpaired α-amylase activity at 50 g l-1 K+. Acidogenesis was more sensitive to alkali metal cations, so acid production and the drop in pH were lowest in a 25-50 g l-1 Na+, acidic environment (pH 4.0-6.0). It was insensitive to cations when the pH was maintained at 7.0-8.0. When the pH was uncontrolled and decreased freely to acidic values, 25 g l-1 of cation inhibited the action of the microbes, which rapidly acclimated, as presented by the slow transformation of soluble polymers to soluble metabolites. However, acidogenetic microbes could not easily recover from inhibition by 50 g l-1 of cation. When the pH was maintained at over 7.0, the microbes were not inhibited by cation (50 g l-1) as indicated by the more active acidogenesis. The metabolic pathways to lactate, acetate and alcohols were not fully coupled. ? Selper Ltd., 2006. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408281 | ISSN: | 09593330 | DOI: | 10.1080/09593332708618646 | SDG/Keyword: | Ammonia; Amylases; Bacteria; Carbohydrates; Enzyme inhibition; Hydrolysis; Metabolites; Metals; Vegetables; Acidogenesis; Alkali metal cations; Alpha-amylase activity; Anaerobic hydrolysis; Metabolic pathways; Protein hydrolysis; Soluble metabolites; Vegetable wastes; Positive ions; acetic acid; alcohol; alkali metal; ammonia; amylase; carbohydrate; carbon; cation; lactic acid; methanol; nitrogen; polymer; potassium ion; proteinase; sodium ion; volatile fatty acid; Acids; Agricultural wastes; Alkali metals; Anaerobic digestion; Hydrolysis; Metabolites; pH effects; Positive ions; alkali metal; cation; hydrolysis; inhibition; acidity; acidogenesis; ammonia formation; anaerobic metabolism; article; carbohydrate metabolism; controlled study; enzyme activity; hydrolysis; metabolite; microbial activity; nonhuman; pH measurement; protein hydrolysis; sensitivity analysis; solid waste management; solubility; total organic carbon; vegetable; anaerobic bacterium; chemistry; hydrolysis; pH; waste disposal; Bacteria, Anaerobic; Hydrogen-Ion Concentration; Hydrolysis; Metals, Alkali; Polymers; Refuse Disposal; Solubility; Vegetables |
Appears in Collections: | 化學工程學系 |
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