Zhang J.,Two Three Institute of Nuclear Industry
Chinese Journal of Environmental Engineering | Year: 2017
Recently, much attention has been given to the application of chemical surfactants for the production of short chain fatty acid (SCFA) from sludge anaerobic fermentation. Compared with chemosynthetic surfactants, bio-surfactants are readily biodegradable and therefore have a low negative impact on the environment. In this paper, a novel bio-surfactant-saponin (SP) is reported, and using SP to enhance the SCFA from sludge anaerobic fermentation is discussed. The experimental results have shown that the optimal SP dosage was 0.2 g·g-1 dry sludge (DS), with the corresponding SFCA production being 2149 mg·L-1. In addition, the effect of the initial pH on the SCFA production from sludge anaerobic fermentation, enhanced by SP, was investigated. The results revealed that the optimal initial pH was 11.Mechanisms study has shown that an initial pH 11 could improve hydrolysis and inhibit methanogenesis, thereby enhancing SCFA production. © 2017, Science Press. All right reserved.
Fan W.,Two Three Institute of Nuclear Industry |
Hu W.-P.,Two Three Institute of Nuclear Industry |
Li Y.-J.,Two Three Institute of Nuclear Industry |
Zhang Z.,Two Three Institute of Nuclear Industry |
Wang W.,Two Three Institute of Nuclear Industry
Xiandai Huagong/Modern Chemical Industry | Year: 2014
Using ultraviolet light and ozone combined oxidation digestion of water samples, the mass concentration of total nitrogen and total phosphorus are determined by ion chromatography. This method avoids the interference of chemical reagents standard method in absorbance factor and assumes high accuracy, high sensitivity and short time. For the analysis of real samples, the total nitrogen recovery is 95.1%-104.4% and the total phosphorus recovery is 94.5%-105.1%. Ion chromatograph with simple and convenient operation, good selectivity, better correlation and low detection limit can be used for the analysis of total nitrogen and total phosphorus in water. ©, 2014, China National Chemical Information Center. All right reserved.