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Liu L.,Shanghai Ocean University | Huang X.,Shanghai Ocean University | Wei L.,Shanghai Ocean University | Zeng B.,Shanghai Ocean University | And 3 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014

This paper investigated the growth performances, nutritional values and nitrogen and phosphorus removals of 15 strains of freshwater microalgae in piggery sewage under lab condition. The results indicated that all 15 microalgae strains reduced the nitrogen and phosphorus levels in piggery sewage effectively. While there were significant differences in removal efficiency among the strains, Scenedesmus spinosus SHOU-F7, S.spinosus SHOU-F8 and S.quadricanda SHOU-F35 displayed the best removal of total nitrogen. S.spinosus SHOU-F7, S.spinosus SHOU-F8 and S.obliquus SHOU-F21 displayed the highest nitrate nitrogen removal rate of 100.00%. Chlorella ellipsoidea SHOU-F3, Oocystis solitaria SHOU-F5 and Tetrachlorella alternans SHOU-F24 had the highest ammonia nitrogen removal rate of 97.82%. All the tested strains had very high phosphorus removal rate, which were more than 91.00%. There were significant differences in cell protein content among the microalgae strains grew in piggery sewage. Ch. Ellipsoidea SHOU-F3 had the highest protein content (43.90%), while S.spinosus SHOU-F8 had the lowest protein content (23.87%). The fatty acid profiles were also different among the strains. The theory cetane numbers of biodiesel from S.spinosus SHOU-F7, S. spinosus SHOU-F8, Chlorella sp. SHOU-F19 and A. acicularis SHOU-F120 were more than 47. Therefore, S.spinosus SHOU-F7, S. spinosus SHOU-F8 and S. quadricanda SHOU-F35 are qualified for purification on piggery sewage, and S.spinosus SHOU-F8 could be the appropriate microalga strain for piggery sewage purification coupling with microalgae biodiesel production. Source


Liu L.,Shanghai Ocean University | Huang X.,Shanghai Ocean University | Wei L.,Shanghai Ocean University | Zeng B.,Shanghai Ocean University | And 3 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014

A 23-day experiment on purification of piggery sewage with microalgae Characium angustum SHOU-F87 was conducted under lab condition. The results showed that C. angustum grew well in autoclaved or active chlorine sterilized piggery sewage. The nitrogen and phosphorus removal efficiency in autoclaved piggery sewage increased along with the increasing inoculation density of C. angustum. When the inoculation densities of C. angustum were 200×104, 400×104 and 600×104 cells·mL-1, the removal efficiencies on total nitrogen, ammonia nitrogen, nitrate nitrogen and total phosphorus were 41.68%, 55.54% and 64.32%; 96.88%, 96.74% and 96.83%; 3.98%, 32.86% and 49.13%; and 90.60%, 95.88% and 94.69% respectively. Compared with those in autoclaved piggery sewage, C. angustum in active chlorine sterilized piggery sewage displayed higher removal efficiencies on total nitrogen and nitrate nitrogen (p<0.05). There was no significant difference in removal efficiencies of ammonia nitrogen and total phosphorus between the microalgae in autoclaved and microalgae in active chlorine sterilized piggery sewage (p>0.05). C. angustum cells cultured in piggery sewage had protein of 30.94%~33.67% and abundant 18∶3n-3 and other n-3 polyunsaturated fatty acids. It is therefore suggested that C. angustum could be applied for effective purification of piggery sewage coupling with production on single cell protein and feed additive for aqua-animal. ©, 2014, Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae. All right reserved. Source

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