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Enhanced primary treatment of low-concentration municipal wastewater by means of bio-flocculant Pullulan

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 719-723页

作者： YANG Kai YANG Xiao-Jun YANG Mo School of Civil Engineering Wuhan University Wuhan 430072 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

Jar tests were conducted to investigate the performance of enhanced primary treatment processes for low-concentra-tion municipal wastewater from South China by using composite flocculant combined with bio-flocculants Pullulan and poly-aluminum-chloride (PAC). The optimum dosage for composite flocculant and conditions for flocculation were determined. The experimental results indicated that composite flocculant had high efficiency for removing over 95% of turbidity, over 58% of CODCr (chemical oxygen demand determined with potassium dichromate), over 91% of TP (total phosphate), and over 15% of NH3-N. Moreover, it could improve sludge settling and dehydration properties, and decrease the treatment cost.

关键词： bio-flocculant Pullulan Enhanced primary treatment

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Extraction of flocculants from a strain of Bacillus thuringiensis and analysis of their properties

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Aquaculture and Fisheries 2017年第4期2卷 179-184页

作者： Jingrong Wu Guangjun Wang Zhifei Li Ermeng Yu Jun Xie Zonglin Zheng Pearl River Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhouGuangdong 510380China Southwest University Rongchang Campus Chongqing 402460China

In a preliminary screening study,our laboratory isolated from the biofloc in aquaculture waters a strain of Bacillus thuringiensis,which produced highly efficient *** the present study,we extracted the crude flocculants from this strain and analyzed their *** analysis indicated that the flocculants were mainly distributed in the supernatant of the fermentation *** flocculants were extracted using an ethanol extraction method,and the chemical compositions and morphology of the crude flocculants were analyzed using the Molish reaction,Fehling reaction,ninhydrin reaction,biuret reaction,phenol-sulfuric acid assay,Coomassie brilliant blue staining,ultraviolet scanning,infrared scanning and scanning electron *** carbohydrate composition of the polysaccharides in the flocculants was analyzed with thin layer *** results indicated that flocculants were solid substances with an ivory white color and their texture was loose and *** under scanning electron microscopy revealed that their ultra-morphology consisted of small,long and fiber-like *** and physical analyses indicated that polysaccharides accounted for 34.5%of the components in the crude *** monosaccharides present in crude flocculants included mainly glucose,galactose and mannitose.

关键词： Bacillus thuringiensis bio-flocculant Property analysis Polysaccharides

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