摘要
聚羟基脂肪酸酯 (PHAs)是许多污泥微生物在不平衡生长条件下合成的细胞内能量和碳源储藏性物质 ,是一种新型的可完全生物降解的热塑性塑料 .以污泥微生物作为PHAs的合成菌 ,采用乙酸钠、丙酸钠及丁酸钠作为单一碳源在好氧条件下合成得到占污泥干重 5 5 8%、3 90 %及 4 98%的PHAs和在厌氧条件下合成得到占污泥干重 1 2 3 2 %、9 5 5 %及 1 1 3 5 %的PHAs.实验表明 ,污泥微生物里广泛存在PHAs合成菌 ,厌氧条件比好氧条件的PHAs产率要高 ;最佳的实验条件下得到PHAs的量占污泥干重的 1 2 3 2 % ,此时碳源转化率为 3 0 65 % .此外 。
Polyhydroxyalkanoates(PHAs) are polyesters synthesized by numerous bacteria in sludge as intracellular carbon and energy storage compounds under the condition of unbalance growth. Another important aspect of PHAs is thermoplastic polyester with the remarkable characteristics of biodegradability. In this paper, using sodium acetate, sodium propionate and sodium butyrate as the unique carbon source, 5 58%、3 90% and 4 98% PHAs of dry sludge weight were obtained by assimilated sludge as PHAs synthesis strains in the anaerobic condition, and 12 32%、9 55% and 11 35% PHAs of dry sludge weight were obtained in the anaerobic condition . It was shown that there were large quantities strains which could accumulate PHAs as granules in the cytoplasm of cells, and the yield of PHAs in the anaerobic process were higher than that in the aerobic process. The best result was that 12.32% PHAs of dry sludge weight was obtained in the best experiment condition, and the yield of the PHAs to substrate was 30 65%. The structures of PHAs were analyzed by 1 HNMR spectrum, and the relationship of the structure of PHAs and the carbon source was explained.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2003年第2期97-101,共5页
Environmental Science
基金
国家自然科学基金项目 (5 0 2 780 36 )
