Dataset Information

Ceramsite production from sediment in Beian River: characterization and parameter optimization.

ABSTRACT: In order to realize pollution control and resource recovery, sediment from Beian River in Mudanjiang City China was used for ceramsite production. The maximum content of total nitrogen (TN), total phosphorus (TP) and organic matter (OM) in sediments of Beian River were 2975 mg kg-1, 2947 mg kg-1 and 29.6%, respectively. So, it should be treated properly for resource utilization. The orthogonal experiment of L 16 (45) was adopted to determine the best conditions for ceramsite production and the result demonstrated that the sewage sludge ratio of 15%, binder ratio of 5%, pre-heating temperature of 450°C, sintering temperature of 1150°C and firing time of 23 min were the optimum conditions. The corresponding product met with the standard of CJ/T 299-2008 and the heavy metal leaching experiment showed it was lower than the threshold of China's industrial standard. Thus, it demonstrated that ceramsite production was a feasible way for utilization of sediment.

SUBMITTER: Jin Y

PROVIDER: S-EPMC6731694 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Ceramsite production from sediment in Beian River: characterization and parameter optimization.

Jin Yong Y Huang Songyu S Wang Qunhui Q Gao Ming M Ma Hongzhi H

Royal Society open science 20190814 8

In order to realize pollution control and resource recovery, sediment from Beian River in Mudanjiang City China was used for ceramsite production. The maximum content of total nitrogen (TN), total phosphorus (TP) and organic matter (OM) in sediments of Beian River were 2975 mg kg-1, 2947 mg kg-1 and 29.6%, respectively. So, it should be treated properly for resource utilization. The orthogonal experiment of L 16 (45) was adopted to determine the ...[more]

PMID: 31598233

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Project description:BackgroundBiopolymers have various applications in medicine, food and petroleum industries. The ascomycetous fungus Ophiocordyceps dipterigena BCC 2073 produces an exobiopolymer, a (1-->3)-beta-D-glucan, in low quantity under screening conditions. Optimization of O. dipterigena BCC 2073 exobiopolymer production using experimental designs, a scale-up in 5 liter bioreactor, analysis of molecular weight at different cultivation times, and levels of induction of interleukin-8 synthesis are described in this study.ResultsIn order to improve and certify the productivity of this strain, a sequential approach of 4 steps was followed. The first step was the qualitative selection of the most appropriate carbon and nitrogen sources (general factorial design) and the second step was quantitative optimization of 5 physiological factors (fractional factorial design). The best carbon and nitrogen source was glucose and malt extract respectively. From an initial production of 2.53 g x L(-1), over 13 g x L(-1) could be obtained in flasks under the improved conditions (5-fold increase). The third step was cultivation in a 5 L bioreactor, which produced a specific growth rate, biomass yield, exobiopolymer yield and exobiopolymer production rate of 0.014 h-1, 0.32 g x g(-1) glucose, 2.95 g x g biomass(-1) (1.31 g x g(-1) sugar), and 0.65 g x (L x d)(-1), respectively. A maximum yield of 41.2 g x L(-1) was obtained after 377 h, a dramatic improvement in comparison to the initial production. In the last step, the basic characteristics of the biopolymer were determined. The molecular weight of the polymer was in the range of 6.3 x 10(5) - 7.7 x 10(5) Da. The exobiopolymer, at 50 and 100. microg x mL(-1), induced synthesis in normal dermal human fibroblasts of 2227 and 3363 pg x mL(-1) interleukin-8 respectively.ConclusionsHigh exobiopolymer yield produced by O. dipterigena BCC 2073 after optimization by qualitative and quantitative methods is attractive for various applications. It induced high IL-8 production by normal dermal fibroblasts, which makes it promising for application as wound healing material. However, there are still other possible applications for this biopolymer, such as an alternative source of biopolymer substitute for hyaluronic acid, which is costly, as a thickening agent in the cosmetic industry due to its high viscosity property, as a moisturizer, and in encapsulation.

Dataset Information

Ceramsite production from sediment in Beian River: characterization and parameter optimization.

Publications

Ceramsite production from sediment in Beian River: characterization and parameter optimization.

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