摘要
研究了掷孢酵母(Sporobolomycetaceaesp.)对含铬电镀废水的生物吸附性能.结果表明,废水的pH值和菌体的培养时间是影响该废水生物吸附的重要因素,适宜的pH为3 5～5 3;培养时间为55～72h.活性污泥的联合使用能有效地促进铬的生物吸附效果.当污泥质量(湿)浓度为10g/L时,25g/L菌体对34 4mg/L总Cr的去除与33 0mg/LCr6+的还原分别高达87 3%、91 9%.对吸附机理和毒性的初步探讨结果表明,菌体对铬的吸附由表面吸附、跨壁膜运输和体内积累组成,其中体内积累对吸附的贡献值最大,达到总吸附量的70 6%;细胞壁对铬毒性的抗性理想,300mg/L铬不会对细胞壁产生0 1nm以上的形态破坏;活性污泥的联合使用有助于铬的还原.
Biosorption on chromium-contained electroplating wastewater by Sporobolomycetaceae sp. was investigated. The results showed that pH of wastewater and cultivated time of cell were the important factors, the feasible values were 3.5～5.3, and 55～72 h respectively. Activated sludge could improved the ability of biosorption effectively. The ratios of 34.4 mg/L total chromium removal and 33.0 mg/L Cr^6＋ reduction were 87.3%, 91.9% respectively, when the concentration of activated sludge and cell were 10g/L and 25g/L. Studies on mechanism of biosorption and toxicity of chromium indicated that biosorption was contained of surface adsorption, transport across cell wall and membrane, and bioaccumulation. Further more, bioaccumulation played significant role in total biosorption capacity, it attainted 70.6%. And the resistance on chromium of cell wall was perfect, breakage exceeded of 0.1nm was not conduced by 300mg/L chromium. Detoxifcation ability would be facilitated by activated sludge.
出处
《暨南大学学报（自然科学与医学版）》
CAS
CSCD
北大核心
2005年第3期401-405,共5页
Journal of Jinan University(Natural Science & Medicine Edition)
基金
国家自然科学基金(50278040)
广东省科技计划(2003C32103)
广东省科技计划重大专项(2004A30308002)资助项目
关键词
掷孢酵母
含铬电镀废水
生物吸附
活性污泥
Sporobolomycetaceae sp.
electroplating wastewater of chromium
biosorp tion
activated sludge
