The production of lactic acid from kitchen garbage, the precursor for production of biodegradable plastics is described in detail. The influence of temperature on the lactic acid concentration, sugar concentration, an...The production of lactic acid from kitchen garbage, the precursor for production of biodegradable plastics is described in detail. The influence of temperature on the lactic acid concentration, sugar concentration, and decrement of garbage were evaluated through experiments. Fermentation were carried out in an incubator at 5, 25, 37 and 50 ℃. The latic acid produced was maximum at initial pH 6.0 and 37 ℃, i.e. 38 g/L with a yield of 0.23 g/gVS. It is concluded from the experimental results that temperature has quite a considerable effect on the production of lactic acid; lactic acid concentration increases with temperature until 37 ℃, and production rate of lactic acid drops at 50 ℃; the optimal fermentation is 37 ℃. This study shows that production of lactic acid from kitchen garbage is feasible and reduction of garbage can be realized.展开更多
An experimental study of the treatment of plastic-contained Japanese MSW （municipal solid waste） employing 1 ton capacity hydrothermal reactor to produce chlorine-free solid fuel has been performed. The system appli...An experimental study of the treatment of plastic-contained Japanese MSW （municipal solid waste） employing 1 ton capacity hydrothermal reactor to produce chlorine-free solid fuel has been performed. The system applies medium-pressure saturated steam at about 2 MPa in a stirred reactor for certain holding period. It was shown that the products exhibited organic chlorine conversion into inorganic chlorine, which can then be water washed. To obtain an optimal operating condition, the temperature and holding period was integrated into one parameter called RS （reaction severity）. It was found that to convert 75% organic chlorine in the MSW, the optimum RS number correlates to an operating temperature of about 225℃ and holding period of 90 min, or 235 ℃ for 60 min. Since hydrothermal treatment is a batch process, a shorter holding period is preferable to increase the number of batches and indirectly increase its processing capacity.展开更多
文摘The production of lactic acid from kitchen garbage, the precursor for production of biodegradable plastics is described in detail. The influence of temperature on the lactic acid concentration, sugar concentration, and decrement of garbage were evaluated through experiments. Fermentation were carried out in an incubator at 5, 25, 37 and 50 ℃. The latic acid produced was maximum at initial pH 6.0 and 37 ℃, i.e. 38 g/L with a yield of 0.23 g/gVS. It is concluded from the experimental results that temperature has quite a considerable effect on the production of lactic acid; lactic acid concentration increases with temperature until 37 ℃, and production rate of lactic acid drops at 50 ℃; the optimal fermentation is 37 ℃. This study shows that production of lactic acid from kitchen garbage is feasible and reduction of garbage can be realized.
文摘An experimental study of the treatment of plastic-contained Japanese MSW （municipal solid waste） employing 1 ton capacity hydrothermal reactor to produce chlorine-free solid fuel has been performed. The system applies medium-pressure saturated steam at about 2 MPa in a stirred reactor for certain holding period. It was shown that the products exhibited organic chlorine conversion into inorganic chlorine, which can then be water washed. To obtain an optimal operating condition, the temperature and holding period was integrated into one parameter called RS （reaction severity）. It was found that to convert 75% organic chlorine in the MSW, the optimum RS number correlates to an operating temperature of about 225℃ and holding period of 90 min, or 235 ℃ for 60 min. Since hydrothermal treatment is a batch process, a shorter holding period is preferable to increase the number of batches and indirectly increase its processing capacity.
